| The Effects of Training and Subject Reproducibility During Vertical Impact Acceleration |
27 SEP 2005 |
12 pages |
| Authors:
Hilary Gallagher; Joseph Pellettiere; Erica Doczy; CONSORTIUM RESEARCH AND FELLOWS PROGRAM ARLINGTON VA
|
 | Several studies have been conducted to collect and analyze the biodynamic response during vertical impact acceleration. There is little data, however, describing the effects of subject training on human response. There are also questions regarding the effect of subject reproducibility and how it might affect data variability. Research is required to determine the effect of training and to properly describe the human response to a vertical impact. This could potentially ... |
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| Multisensory Integration for Pilot Spatial orientation (MIPSO) |
MAR 2004 |
103 pages |
| Authors:
Ronald L. Small; Christopher D. Wickens; Alla M. Oster; John W. Keller; Jon W. French; MICRO ANALYSIS AND DESIGN BOULDER CO
|
| Spatial disorientation (SD) is a normal human response to accelerations in flight, and has existed since early flight. Its cost to the US military is over $300 million per year, with comparable costs to US civil aviation. Despite significantly increased research over the past decade, the rate of accidents caused by SD has not decreased. While the most recent research emphases have been on understanding the physiology of SD, the ... |
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| Analysis of Two Methods of Isometric Muscle Contractions During the Anti-G Straining Maneuver |
MAY 2003 |
85 pages |
| Authors:
Lance L. Annicelli; NEVADA UNIV LAS VEGAS
|
| This study investigated the difference in Mean Arterial Pressure (MAP) and Cardiac Output (CO) between two methods of isometric muscle contractions during the Anti-G Straining Maneuver (AGSM). 12 subjects (ages 18 to 38 years, height 176.8 plus or minus 7.4 cm, body mass 78.8 plus or minus 15. 6 kg, percent body fat 14.3 plus or minus 6.6%) participated in the study. The study was a one-way within-subject design with ... |
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| G-Transition Induced Loss of Orientation and Reduced G Threshold |
FEB 2003 |
|
| Authors:
Bob Chenng; Bill Ercoline; Paul Metz; DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
|
 | It has been suggested that the psychophysical and physiological responses to the interplay of rotation and acceleration stresses may result in spatial disorientation (SD) (18, 4). The purpose of this presentation is to review past and current evidence on the possible relationship between disorientation and acceleration stress. Accident scenarios and a number of in-flight observations will be presented together with some theoretical postulates on the mechanisms involved. Our investigation suggests ... |
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| Disorientation, Dizziness and Postural Imbalance in Race Car Drivers, a Problem in G-Tolerance, Spatial Orientation or Both |
FEB 2003 |
|
| Authors:
Frederick E. Guedry; Anil K. Raj; Thomas B. Cowin; UNIVERSITY OF WEST FLORIDA PENSACOLA INST FOR HUMAN AND MACHINE COGNITION
|
| On April 28, 2001, Championship Auto Racing Teams (CART) drivers reported experiences of disorientation, dizziness, nausea and blurred vision during practice trials on the Texas Motor Speedway (TMS). Following the practice trials, there were reports of postural imbalance. As a result, the Firestone Firehawk 600 race scheduled for Sunday April 29 was cancelled,; the first time in auto racing history that concerns about driver intolerance to G forces caused a ... |
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| G & alpha: Centrifuge Occupant Tolerance to Simultaneous High G and High Angular Acceleration |
FEB 2003 |
|
| Authors:
Tamara L. Chelette; Curtis H. Spenny; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH DEPT OF MECHANICAL ENGINEERING
|
| The ability of a centrifuge operated as a Dynamic Flight Simulator to meet the response recommendations of the Federal Aviation Administration (FAA) for motion simulators is discussed. The effect on an occupant of angular acceleration artifacts produced by such an enhanced centrifuge is explored. The concern investigated herein is whether these high angular acceleration artifacts are dangerous, disorienting, or distressing. Human response tests have been conducted on the centrifuge at ... |
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| Human Consequences of Agile Aircraft (Facteurs humains lies au pilotage des avions de combat tres manoeuvrants) |
MAY 2001 |
|
| Authors:
NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)
|
| While historically agile flight was first seen as an issue of airframe agility with a consequent emphasis on acceleration issues, there has been an evolution in the understanding of agility. WG 27 adopted WG 19's recommendations that airframe agility is only one aspect of agility which when combined with weapons agility and systems agility results in "operational agility". The experienced pilots that we interviewed saw a real operational need for ... |
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| Human Consequences of Agile Aircraft (Cycle de conferences sur les facteurs humains lies au pilotage des avions de combat tres manoeuvrants) |
MAR 2000 |
|
| Authors:
NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)
|
| This Lecture Series evaluates the human factors implications for pilots of "superagile flight", specifically with regard to agile airframes, agile weapons, and rapidly configurable systems. During interviews, experienced pilots have confirmed the operational need for military aircraft agility. Although pilots have noted that their experiences to date have not caused them any major concerns regarding the potential for physiological problems, significant gaps remain in our understanding of the effects of ... |
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| Ear Pulse Waveform Parameters During the Gradual Onset Centrifuge Training Profile |
JUN 1999 |
34 pages |
| Authors:
M. Holewijn; J. van der Burgt; A. Kuijper; NATIONAL AEROMEDICAL INST SOESTERBERG (NETHERLANDS)
|
| During regular centrifuge training at the Aeromedical Institute the ear photoplethysmogram and the ECG of 15 (candidate) pilots were measured. The main goal of present study was to evaluate the use of the ear pulse waveform (ear pulse) as a potential feedback parameter of a pilot's head level blood pressure during accelerations. From the ear pulse waveform, the amplitude of the pulse and the pulse transit ... |
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| The Effect of Aircrew Age on +Gz Tolerance as Measured in a Human-Use Centrifuge. (Abstracts) |
23 APR 1999 |
3 pages |
| Authors:
Estrella Forster; Barry Shender; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| A data repository was established in 1988 to compile information on 1,120 aircrew (74% pilots) who underwent acceleration (+Gz) tolerance training at NAWOAD Patuxent River human-use centrifuge. 51% of the aircrew flew in high performance aircraft (F4, F14, F15, F16, and Fl 8). The trainees were U.S. Navy/ Marine Corps (70%) and Air National Guard (30%) aircrew. Balanced data from 817 healthy male trainees were examined. Mean age (+S.D.) was ... |
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| Female Acceleration Tolerance Enhancement (FATE) Project |
APR 1998 |
17 pages |
| Authors:
James W. Dooley; Robert M. SHaffstall; Christopher M. Hearon; AIR FORCE RESEARCH LAB BROOKS AFB TX HUMAN EFFECTIVENESS DIRECTORATE
|
| To support the 1993 U.S. Secretary of Defense directive to open combat aircraft assignments to women, investigators of the Female Acceleration Tolerance Enhancement (FATE) Project determined female and male subjects' G- protective equipment fit and their tolerance/endurance to simulated aerial combat maneuvers (SACM). Methods: A study of female subjects previously conducted in our laboratory, employing a +4.5 to +7Gz SACM (4.5-7 SACM), indicated women ... |
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| Selection and Training Advances in Aviation (Les Progres Realises en selection et Formation des Personnels Navigants) |
NOV 96 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| The Aerospace Medical Panel (AMP) of the Advisory Group for Aerospace Research and Development (AGARD) held a Symposium entitled Selection and Training Advances in Aviation. The AMP Symposium was held to address the effectiveness and utility of current selection and training systems, to describe current research and development in selection and training, to explore potential improvements in operational and experimental systems, and to discuss challenges in future research and development. ... |
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| Differences in Mechanism Between Syncope Resulting from Rapid Onset Acceleration and Orthostatic Stress |
APR 96 |
41 pages |
| Authors:
David A. Self; Curtis D. White; Robert M. SHaffstall; Benjamin L. Mtinangi; Jennifer S. Croft; AIR COMMAND AND STAFF COLL MAXWELL AFB AL
|
| Orthostatically- induced syncope is accompanied by venous pooling and vasodilatation. Loss of consciousness during head-to-foot acceleration (G-LOC) in aviators may be caused by a different mechanism, as venous pooling should be prevented through the use of an anti-G suit. This research was conducted to test the hypothesis that in individuals wearing a well-fitted anti-G garment, there are no important changes in volume of dependent regions during loss of consciousness resulting ... |
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| Evaluation of an Energy Absorbing Truck Seat for Increased Protection from Landmine Blasts |
JAN 96 |
63 pages |
| Authors:
Nabih M. Alem; Gregory D. Strawn; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Mine blast resistant kits, developed by the Night Vision and Electronic Sensors Directorate (NVESD), are designed to enhance the survivability of the crew of military 5-ton trucks. The kit includes an energy- absorbing (EA) seat which is the focus of this report. A full-scale demonstration mine blast of a 5-ton truck was conducted using the full protection kit and included two anthropomorphic manikins to represent the passenger and driver. Only ... |
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| Operating Characteristics of a Propylene Charged Loop Heat Pipe with Potential Spacecraft Applications |
SEP 95 |
150 pages |
| Authors:
Joseph A. Gherlone Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Heat pipes have been in use for spacecraft thermal control since the early 197Os. They offer the advantages of high thermal conductance with relatively low mass, but suffer the liabilities of a rigid configuration and sensitivity to adverse acceleration (exemplified by the evaporator raised over the condenser in earth's gravity field). The Loop Heat Pipe was developed in Russia specifically to address these concerns. Using a metal matrix wick with ... |
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| Female Upper Body Dynamic Strength Requirements in High Performance Aircraft. A Selected Bibliography |
01 JUN 95 |
51 pages |
| Authors:
Barry S. Shender; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
| The Presidential Commission on the Assignment of Women in the Armed Forces has expanded the role of women in the military with its new 'gender- neutral' assignment policy. NAWCADWAR is conducting a series of tests to determine 'gender neutral' dynamic strength requirements for small stature females performing operationally relevant tasks in a high performance cockpit. This report contains a bibliography of the results of a literature review conducted prior to ... |
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| Microseism Measurements at the Waterfront - An Aid to Navy Base Microzonation |
FEB 95 |
179 pages |
| Authors:
John Ferritto; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
| The US Navy has a number of bases in seismically active areas. Mission requirements dictate that these bases be located at the waterfront, often on marginal soils. Since the seismic exposure is high, the Navy has had an active research program to mitigate the risk to waterfront structures. The dynamic response of saturated cohesionless soils results in a loss of strength; liquefaction and the potential for associated damage is a ... |
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| Command History, 1993 |
APR 1994 |
145 pages |
| Authors:
R. E. Gadolin; K. S. Mayer; NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
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| This publication is a compilation of significant events that occurred at the Naval Aerospace Medical Research Laboratory during 1993 |
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| Effects of Weight Lifting on Intrathoracic Presures Generated by Anti-G Straining Maneuvers |
1994 |
19 pages |
| Authors:
L. G. Meyer; J. D. Grissett; J. G. Lamberth; NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
|
| The purpose of this study was to assess the effects of physical fitness program on the ability to perform an anti-G straining maneuver (AGSM). We used mouth-generated intrathoracic pressure (IP) as an index of effectiveness of the AGSM. We compared changes in IP in experimental subjects who performed the AGSM 5 times per week and participated in a weight lifting exercise program to IPs in control subjects who performed the ... |
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| Loads Induced in the Lumbar Spine of Seated Restrained Humans by Sideward (+Gy) Impact |
1994 |
12 pages |
| Authors:
Joseph P. Strzelecki; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH BIODYNAMICS AND BIOCOMMUNICATIONS DIV
|
| The parameters used to calculate the Dynamic Response (DR - the currently accepted injury criteria for multi-axis impact) for sideward impact are based on a very limited data set. In addition, the current model for spinal injury due to z axis acceleration is based on displacement and cannot account for the effects of off-axis loads. METHODS: Seated, restrained human volunteers were subjected to sideward impacts ranging from 0.031 to 0.250 ... |
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| Motion and Spatial Disorientation Systems: Special Research Capabilities |
APR 1993 |
58 pages |
| Authors:
A. H. Rupert; R. E. Gadolin; NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
|
| The wide variety of unique devices together with the scientists and technicians who operate them have enabled the Naval Aerospace Medical Research Laboratory (NAMRL) to develop an international reputation as a center of excellence in vestibular research and the dynamics of spatial orientation, and for training outstanding scientists who are engaged in basic research worldwide. This document contains a brief description of the man-rated acceleration research facilities of the United ... |
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| A Multi-Branched Model of the Cardiovascular System: Application to G- Research |
93 |
9 pages |
| Authors:
Sherwood Sam; ARMSTRONG LAB BROOKS AFB TX AEROSPACE MEDICINE DIRECTORATE
|
| Heretofore cardiovascular system (CVS) models have been either too refined with applications only to special subsystems of the CVS, or too gross with only limited versatility due to their inadequate resolution. In this paper, we report on a multi-branched model of the complete CVS that bridges the gap between these two groups of models. This model, which is motivated by aviation and space research, extends the models of Avolio and ... |
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| Naval Biodynamics Laboratory 1993 Command History |
93 |
58 pages |
| Authors:
NAVAL BIODYNAMICS LAB NEW ORLEANS LA
|
| The Naval Biodynamics Laboratory (NBDL) was established as the Naval Aerospace Medical Research Laboratory Detachment (NAMRLD) in April 1971 by the Bureau of Medicine and Surgery. NAMRLD was a detachment of the Naval Aerospace Medical Research Laboratory which is located at the Naval Air Station, Pensacola, Florida. The initial purpose of the Detachment was to study human response to impact acceleration. In 1975, the mission was expanded to include human ... |
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| System Test Results of the Advanced Technology Anti-G Suit (ATAGS) |
NOV 92 |
10 pages |
| Authors:
Larry J. Meeker; John H. Olhausen; Grady L. Ripley; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
|
| Previous centrifuge and flight testing have shown that the ATAGS offers superior G endurance protection even when operated at lower pressures than the standard anti-G suit. All of the previous ATAGS testing was done, however, using human test subjects for the purpose of evaluating G protection. The purpose of the parametric tests was to provide basic system data such as volumes, fill rates and pressure differentials for the ATAGS. In ... |
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| G-Tolerance and Spatial Disorientation Can Simulation Help Us? |
FEB 1992 |
|
| Authors:
J. Smit; R. E. Van Patten; NETHERLANDS AEROSPACE MEDICAL CENTRE SOESTERBERG
|
| Pilots of modern fighter aircraft are endangered by high G- forces, loss of situational awareness and spatial disorientation. In order to prepare aircrew for this factors, ground based training facilities simulating some aspects of the relevant phenomena are used. The human centrifuge has proven to be rather effective in increasing G-tolerance, especially in conditions of high onset rate. Unrealistic simulation caused by the small radius of rotation in centrifuges at ... |
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| A Kinematic Model for Predicting the Effects of Helmet Mounted Systems |
DEC 1991 |
|
| Authors:
Terry A. Watkins; M. S. Weiss; D. W. Call; S. J. ; NEW ORLEANS UNIV LA DEPT OF MATHEMATICS
|
| A statistical study was made using head kinematic response data from a set of 79 human -X impact acceleration tests conducted at the Naval Biodynamics Laboratory. Five volunteer subjects were tested successively in three configurations: (a) no helmet, (b) helmet only, and (c) helmet with weights. The peak acceleration levels ranged from 3g to 10g. Three kinematic responses, the X and Z components of the linear acceleration and the Y ... |
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| Human Performance Under High G Environments: A Comparison of Upright and Reclined Seat Configurations |
15 OCT 91 |
27 pages |
| Authors:
John E. Deaton; Edward M. Hitchcock; NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DEPT
|
| The present study investigated human cognitive performance under high G in an upright seat and two reclined seats (PALE and Tilt-back). Subjects were required to perform a perceptual/motor and a classification task both separately and concurrently. Data were gathered prior to G-onset, during varying levels of acceleration, and post-G. Results indicated that neither of the reclined seats were superior to the upright seat at high G levels. Perceptual/motor data revealed ... |
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| The Effect of Variable Seat Back Angles on Human Response to +Gz Impact Accelerations |
MAY 91 |
|
| Authors:
Chris E. Perry; Dena M. Bonetti; James W. Brinkley; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH
|
| During 1986-1987, eighty-two human impact experiments were accomplished on a vertical deceleration tower to determine the influence of variable seat back angles on human dynamic response to short-duration acceleration applied in the +x axis. Subjects were exposed to acceleration at a level of 10 G using a vertical deceleration tower. The seat back angle varied as follows: (1) +5 deg (5 deg aft of vertical), (2) 0 deg (vertical), (3) ... |
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| Proceedings of the Annual Meeting of the UIPS Commission on Gravitational Physiology (12th) Held in Leningrad, USSR on 14-18 October 1990 |
16 APR 91 |
|
| Authors:
N. Pace; AEROJET ELECTRONIC SYSTEMS DIV AZUSA CA
|
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| Visual Evoked Response (VER) Detection of Loss of Peripheral Vision |
DEC 90 |
6 pages |
| Authors:
William B. Albery; Richard T. Gill; IDAHO UNIV MOSCOW
|
| A novel concept of objectively determining when a centrifuge subject and subsequently, a pilot, loses peripheral vision due to the physiological effects of sustained acceleration was attempted. The approach was to modulate lights in the peripheral vision of the subject as the subject stared at a centrally fixed indicator. It was demonstrated by using a special, lock-in amplifier, that a reliable visual evoked response (VER) could be elicited in the ... |
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| A Cryocooler for High Acceleration Applications |
20 SEP 90 |
|
| Authors:
Michael J. Nilles; ALABAMA CRYOGENIC ENGINEERING HUNTSVILLE
|
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| Current Status of an Artificial Intelligence-Based Loss of Consciousness Monitoring System for Advanced Fighter Aircraft, |
SEP 1990 |
|
| Authors:
William B. Albery; Robert E. Van Patten; HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| During this past decade, fourteen U.S. Air Force pilots lost their lives and aircraft to gravity induced loss of consciousness, or GLOC. GLOC is not a new problem, it has been around for every 70 years. Because of the emergence of high performance aircraft such as the F-16 and F-15 and the fact that these aircraft can perform beyond the acceleration tolerance limits of the human, GLOC has become the ... |
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| Neck Injury in Advanced Military Aircraft Environments |
FEB 90 |
197 pages |
| Authors:
ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE)
|
| Anecdotal evidence suggests that soft tissue neck injury may be an occupational hazard for fighter pilots, particularly those in the later generation trainer and combat aircraft. Recent advances in helmet-mounted devices increase the potential for injury. There is an acute need for guidance on the maximum mass and mass distribution characteristics of head-mounted devices. The Symposium discussed the extent of risk and its control through the design of helmet-mounted devices, ... |
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| Implications of Advanced Technologies for Air and Spacecraft Escape |
FEB 90 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| This Symposium addressed the latest technological advances in all areas which affect overall escape system performance and capabilities. Escapes from hypersonic vehicles and spacecraft were also considered. Partial contents: Development of acceleration exposure limits for advanced escape systems; Development of an ejection seat specification for a new fighter aircraft; Escape system research at RAE; Fighter escape systems -- The next step forward; Potential role of avionics in escape systems; Ejection ... |
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| +Gz Protection in the Future - Review of Scientific Literature |
NOV 89 |
|
| Authors:
Fred Buick; DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)
|
| To reduce the incidence of G-induced loss of consciousness and enable pilots to operate their aircraft at higher levels of performance, anti-G protection must be improved. A G-suit and the anti-G straining maneuver will likely remain essential components of any anti-G system,but several methods potentially increasing G-tolerance have been investigated that could supplement the protection afforded by these traditional techniques. Pharmacological agents are of no benefit, while breathing carbon dioxide, ... |
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| Guidelines for Safe Human Exposure to Impact Acceleration. Update A |
01 SEP 89 |
|
| Authors:
Marc S. Weiss; David L. Matson; Stephen T. Mawn; NAVAL BIODYNAMICS LAB NEW ORLEANS LA
|
| Tolerance levels for living human volunteers are defined and developed for minimum risk injury. The experimentally safe levels of impact, derived from a variety of sources, are suggested as guidelines for torso- restrained volunteers, where the freely moving head and neck are the anatomical segments most at risk. These recommended limits are no greater than the maximum exposures already experienced by Naval Biodynamics Laboratory's volunteers. No injuries have been sustained ... |
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| A Comparison of Two Subject-Controlled Attitude Measures during Somatogravic Illusion Exposure |
MAY 89 |
82 pages |
| Authors:
John F. Thompson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The United States Air Force School of Aerospace Medicine (USAFSAM) has a requirement for a performance evaluation and comparison of two subject- controlled attitude indicators during exposure to the somatogravic or posturogravic illusion. This illusion is well known for giving aircraft pilots a false sensation of excessive pitch-up during take-off. With a lack of visual stimuli, the pilot misinterprets the resultant gravitoinertial force vector as approximating the vertical force vector ... |
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| Brain O2 Reserve Limiter for High Performance Aircraft. |
18 APR 1989 |
|
| Authors:
Robert E. Van Patten; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A method for controlling an aircraft to prevent high G-caused pilot unconsciousness is disclosed. Data defining a state space of acceleration, rate of change of acceleration and duration of acceleration at maximum acceleration within which an aircraft may be operated without causing pilot unconsciousness is provided to an aircraft intelligent flight control system. The flight control system continuously monitors the past and present state of the aircraft and compares to ... |
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| The Effect of Various Straining Maneuvers on Cardiac Volumes at 1G and during +Gz Acceleration |
JAN 89 |
|
| Authors:
Tom Jennings; Lloyd Tripp; Lora Howell; John Seaworth; David Ratino; HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT- PATTERSON AFB OH
|
| The purpose of this study was to evaluate the effect of Valsalva (Val), isometric contraction (Iso) and the L-1 maneuvers (L-1) on cardiac volumes at 1G and during 4G. Two-dimensional echocardiography was used to measure volumes. 1G Phase: Eight seated male subjects performed the three maneuvers. The end-diastolic volume (EDV) decreased during Val and L-1 (p<0.05). EDV decreased initially but then returned to baseline with Iso. 4G Phase: Seven male ... |
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| A Wind Tunnel and Computer Investigation of the Low Speed Aerodynamic Characteristics of the Prone Escape System (PRESS) |
DEC 88 |
|
| Authors:
Lonnie R. Dillon; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Due to new design technology, future jet fighters will fly at higher g levels than before. A previous preliminary design study was conducted to develop an ejection seat providing higher g-tolerance for the crewmember during maneuvering as well as improved windblast protection during ejection. This seat used the crewmember in a prone, or leaning forward, position. The Prone Ejection System was computer simulated at supersonic conditions in the earlier report ... |
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| Recovery from Gz-induced Loss of Consciousness: Psychophysiologic Considerations |
JUN 88 |
|
| Authors:
Estrella M. Forster; James E. Whinnery; SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
|
| Eight healthy male volunteer members of the USAFSAM acceleration panel were exposed to two consecutive acceleration runs of +1 Gz to +7 Gz at 6 G/s onset rates. The subjects were instructed to relax during the acceleration exposure in order to voluntarily induce loss of consciousness (LOC). The subjects were asked to relate dreams, thoughts, or other mental illusions experienced during G-LOC episodes. Most subjects were amused and surprised, as ... |
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| Assisted Positive Pressure Breathing for Augmentation of Acceleration Tolerance Time |
MAR 88 |
|
| Authors:
John W. Burns; Ulf I. Balldin; SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
|
| The addition of assisted (chest counterpressure), positive pressure breathing at 50 mm Hg and 70 mm Hg was compared to the current operational support of the G-suit and the anti-G straining maneuver (AGSM) without PPB, during acceleration exposures of sustained 9 +Gz for 45 s and a 5-9 +Gz simulated aerial combat maneuver (SACM) to exhaustion. We selected 7 highly motivated male centrifuge subjects from a group of 31 volunteers. ... |
|
| Acceleration-Induced Electrocardiographic Interval Changes |
FEB 88 |
|
| Authors:
Cyrus C. Whinnery; James E. Whinnery; AIR FORCE ACADEMY CO
|
| ELECTROCARDIOGRAPHIC (ECG) intervals vary in response to changes in heart rate. Variations in these intervals are also affected by exercise but in a manner not solely dependent on heart rate changes (2). Alterations in such factors as autonomic tone have an effect, especially on the GT interval. A quantitative description of the QT-interval response to +Gz stress is necessary for defining the normal ECG response. Once the normal response has ... |
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| The Effects of Biodynamic Stress on Workload in Human Operators |
JAN 88 |
|
| Authors:
William B. Albery; HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT- PATTERSON AFB OH
|
| The objective of this research was to assess the effect of high intensity noise stress and of sustained acceleration on human operator workload and performance. Workload was measured via three different methodologies. Subjective workload was measured with the Subjective Workload Assessment Technique (SWAT); performance-based measures were derived from single and dual psychomotor task performance; and physiological parameters included heart rate, blood pressure, total eye blinks duration, forearm electromyogram and evoked ... |
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| Current and Emerging Technology in G-LOC (G-Induced Loss of Consciousness) Detection: Noninvasive Monitoring of Cerebral Microcirculation Using Near Infrared |
JAN 88 |
|
| Authors:
D. H. Glaister; SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX CREW TECHNOLOGY DIV
|
| G-induced loss of consciousness (G-LOC) has emerged as an important operational problem of high-performance aircraft. Since it appears that G-LOC will continue to be a problem, a requirement exists to detect its occurrence in pilots so that the aircraft may be placed on autopilot. One excellent method of detecting G-LOC physiologically, one would assume, would be based on the oxidative status of the brain. This determination can be made noninvasively ... |
|
| Measurement and Modification of Sensorimotor System Function during Visual-Motor Performance |
21 AUG 87 |
17 pages |
| Authors:
M. B. Sterman; G. J. Schummer; T. W. Dushenko; J. C. Smith; CALIFORNIA UNIV LOS ANGELES
|
| Both laboratory and in-flight studies were carried out in order to evaluate the utility and feasibility of EEg monitoring as a means of identifying central nervous system correlates of performance and G-force effects during military flight operations. Four studies were conducted, two with controlled laboratory simulation, and two in actual flight during military training missions. Data analysis focused on EEG power-spectral density characteristics and their temporal modulation, specifically in sensorimotor ... |
|
| The Relationship between Changes in Arterial Pressure, Esophageal Pressure and the EMG (Electromyography) of Various Muscle Groups during the L-1 Straining Maneuver at Different Spine-to-Thigh Angles |
JUL 87 |
52 pages |
| Authors:
Carole A. Williams; J. E. Douglas; Gary Miller; A. Karl; R. L. Wiley; SYSTEMS RESEARCH LABS INC DAYTON OH
|
| Changes in arterial blood pressure, intrathoracic pressure, heart rate, and the electromyographic activity of various muscle groups were determined while 9 male subjects performed L-1 straining maneuvers at four spine-to-thigh angles (70, 84, 94, and 105 deg). There was no significant difference between the changes in these physiological variables due to the different angles. At the onset of the L-1, arterial pressure immediately increased to an average of 195 mm ... |
|
| Anti-G Suit. |
23 JUN 1987 |
|
| Authors:
Thomas J. Jennings; Lloyd D. Tripp Jr.; Lora L. Howell; Dimitrios G. Loukoumidis; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| An improved anti-G suit incorporates stiffening inserts sized and shaped to cover each inflatable air bladder and inserted between the bladders and the anti-G suit fabric. the stiffeners may be made of polypropylene, neoprene rubber, or a composite structure of Kevlar fabric and polyethylene. A butt strap covers the buttocks of an aircrew member and is secured by belts extending across the abdominal and the thigh bladders of the anti-G ... |
|
| Arterial Blood Velocity to Volume Flow Converter. |
26 MAY 1987 |
|
| Authors:
Richard J. Crosbie; Joseph Colombo; J. W. Grant; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A arterial blood velocity-to-volume flow rate converter, including a pair of function generators a computer, and a multiplier, is incorporated within a system to objectively measure by non-invasive means the blood volume flow rate to the head of an occupant in a rapidly accelerating vehicle, and take corrective measure to stabilize the vehicle when that flow falls below a preselected lower for a predetermined length of time. A conventional ultrasonic ... |
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| Research and Development of Anti-G Life Support Systems. Part 1. Development and Evaluation of Uniform-Pressure Anti-G Suits |
APR 1987 |
53 pages |
| Authors:
Robert W. Krutz Jr.; Roy W. Thompson; Arnold G. Krueger; Emily M. Gause; TECHNOLOGY INC SAN ANTONIO TX LIFE SCIENCES DIV
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| A skin pressure measuring device was designed and fabricated to measure pressure actually applied to the lower body during anti-G suit inflation. This device was used with a variety of developmental uniform pressure anti G suits; basketweave, multiple capstan, and reticulated foam suit designs were evaluated. Results indicated that owing to engineering incompatibilities involving weight, bulk, sizing, fitting, and effective pressure loss attributable to friction between the interdigitized tapes, the ... |
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ACCELERATION TOLERANCE
