| Effects of Head-Supported Devices on Female Aviators During Simulated Helicopter Rides. Part I: Biomechanical Response |
JUN 2000 |
64 pages |
| Authors:
Khalid W. Barazanji; Nabih M. Alem; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
 | Researchers at the U.S. Army Aeromedical Research Laboratory (USAARL) recently concluded that weight-moment of head-supported devices (HSDs) worn by male aviators should not exceed 82.8 +/- 22.9 Newton-centimeters (N-cm). The goal of this study was to define a safe range of weights and centers of mass of HSDs that can be tolerated by female helicopter pilots without affecting their health or degrading their performance. Twelve subjects were exposed to whole- ... |
|
| Effects of Seat Stroke Distance on the Allowable Mass of Head Supported Devices |
APR 1998 |
16 pages |
| Authors:
Amir A. Mobasher; Frederick T. Brozoski; B. J. McEntire; Nabih M. Alem; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| The effects of stroking distance of energy attenuating helicopter seat on head supported device (HSD) masses were investigated in various helicopter crash scenarios. The Articulated Total Body (ATB) model was used to simulate the helicopter pilot's biodynamic response to five different crash pulses. Parameters of the simulations included two allowable seat stroking distances (2.5 and 25 cm) and four HSD masses (0.45, 1.4, 2.7, and 4.1 kg). The simulations were ... |
|
| Force Transmission through Chest Armor during the Defeat of .50-Caliber Rounds |
FEB 96 |
106 pages |
| Authors:
Joseph L. Haley Jr.; Nabih M. Alem; B. J. McEntire; James A. Lewis; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| In the past two decades, armor producers have developed a curved lightweight Kevlar(tm) backed ceramic plate for the chest capable of defeating a 50-caliber machine gun projectile. Although this ceramic armor is effective in defeating the 1/10-pound projectile, the deformation of the Kevlar(tm) inside surface can cause severe, incapacitating injury. In an attempt to determine the Kevlar(tm)-to-chest space (standoff) needed to prevent such injury and/or incapacitation, a live fire test ... |
|
| Injury Risk for Research Subjects With Spina Bifida Occulta in a Repeated Impact Study: A Case Review |
JAN 1996 |
12 pages |
| Authors:
John P. Albano; Samuel G. Shannon; Nabih M. Alem; Kevin T. Mason; CANADIAN COMMERCIAL CORP OTTAWA (ONTARIO)
|
| Spina bifida occulta (SBO) occurs in 18-34% of the normal U. S. population. Recently, 16.5% of normal, asymptomatic male soldier volunteer candidates in a U.S. Army Aeromedical Research Laboratory ride motion study were excluded from the study because they had SBO at one vertebral level. Disqualifying this percentage of screened research subject candidates threatened the timely completion of the schedule intense protocol. Although one study suggests that SBO at spinal ... |
|
| 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 ... |
|
| Effects of Head Supported Devices on Pilot Performance During Simulated Helicopter Rides |
SEP 95 |
16 pages |
| Authors:
Nabih M. Alem; Martin D. Meyer; John P. Albano; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Effects of helmet weight moments on helicopter pilot fatigue and performance during extended missions were evaluated in a study in which 12 volunteer subjects were exposed to random vibrations in 4-hour sessions while wearing various helmet configurations. One of the objectives of the study was to investigate an upper limit criterion of 83 N cm for the weight moment of head- worn devices previously proposed by Butler (1992). In this ... |
|
| Three-Dimensional Photogrammetry for Laboratory Applications |
DEC 94 |
31 pages |
| Authors:
Nabih M. Alem; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| The direct linear transformation (DLT) is a method that simplifies measurements of the three-dimensional coordinates of a point target in the laboratory using photographic two-dimensional imagery. This report describes a procedure to implement the DLT equations and gives the Fortran code of computer programs for the DLT calibration of multicamera system and 3-D reconstruction of a single point from several images. (AN) |
|
| Manikin Integrated Data Acquisition System (MIDAS) Initial Modifications |
DEC 94 |
36 pages |
| Authors:
Nabih M. Alem; James A. Lewis; Robert M. Dillard; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| A prototype manikin with internal data acquisition system (MIDAS) has been developed and received by the US Army Aeromedical Research Laboratory. In addition to a novel design of the spinal column and pelvis of the Hybrid III automotive manikin, the new MIDAS includes a built-in signal conditioning and acquisition electronics. This report documents the initial modifications to the manikin and includes a description of the external software (MIDAS 3.0) for ... |
|
| Biodynamic Simulation of Pilot Interaction with a Helicopter Multiairbag Restraint System |
OCT 94 |
37 pages |
| Authors:
Gregory Strawn; Nabih M. Alem; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| The introduction of airbags into the helicopter cockpit has raised the issue of acceptable limits on the weights of helmet-supported devices which can be tolerated safely by the aviator. It is hypothesized that, if the acceptable injury risk associated with current helmet-supported weights were reduced with the use of airbags, then an increase in the helmet weight would not necessarily increase the injury risk above what is acceptable without an ... |
|
| A Correlative Investigation of Simulated Occupant Motion and Accident Report in a Helicopter Crash |
AUG 94 |
31 pages |
| Authors:
David G. Beale; Nabih M. Alem; Barclay P. Butler; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| In 1987, an Army Apache helicopter crashed during a training mission at Fort Rucker, Alabama, resulting in fatal injuries to the rear seat pilot and survivable injuries to the front seat copilot. Figure 1 shows the seating configuration of the two pilots. U.S. Army Safety Center (USASC) investigators at Fort Rucker, Alabama, reported the aircraft damage assessment and aircrew member injuries. U.S. Army Aeromedical Research Laboratory (USAARL) researchers at Fort ... |
|
| Whole-Body Vibration Assessment of the M1070 Heavy Equipment Transporter. Volume 1 |
AUG 94 |
29 pages |
| Authors:
Tammy L. Simmons; Barclay P. Butler; Nabih M. Alem; Bradley S. Erickson; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| An evaluation of all new tactical vehicles and aircraft is required to assess potential whole-body vibration (WBV) health hazards to crewmembers. As requested by the U.S. Army Environmental Hygiene Agency (USAEHA), a health hazard assessment (HHA) was performed by the U.S. Army Aeromedical Research Laboratory (USAARL) on the M1070 Heavy Equipment Transporter System (HETS). The HETS was tested on three cross-country courses at Aberdeen Proving Ground (APG), MD, by the ... |
|
| Whole-Body Vibration Assessment of the M1070 Heavy Equipment Transporter. Volume 2 |
AUG 94 |
187 pages |
| Authors:
Tammy L. Simmons; Barclay P. Butler; Nabih M. Alem; Bradley S. Erickson; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
|
| Apache Helicopter Seat Cushion Evaluation |
JUL 94 |
61 pages |
| Authors:
Barclay P. Butler; Nabih M. Alem; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Two prototypes of the AH-64 pilot seat cushions were evaluated against the standard cushion set by each of a group of 12 AH-64 instructor pilots after being exposed to simulated AH-64 vibration signatures for a period of 1 hour. Objective indications of vibration attenuation were obtained by measuring transfer functions across each cushion. Subjective pilot preferences also were obtained after each ride using a questionnaire. Results of the objective measurements ... |
|
| The Airbag as a Supplement to Standard Restraint Systems in the AH-1 and AH-64 Attack Helicopters ant Its Role in Reducing Head Strikes of the Copilot/ Gunner. Volume 2 |
JAN 91 |
162 pages |
| Authors:
Nabih M. Alem; Dennis F. Shanahan; John V. Barson; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Accident investigation records of U.S. Army helicopter crashes show injuries of pilots due to striking a structure inside the cockpit outnumber those due to excessive accelerations by a five-to-one ratio. This two-volume report presents the results of a study of the effectiveness of airbags in reducing the severity of contact injury to the gunner when striking the gunsight. Airbag systems were installed on the gunsights in simulated Cobra and Apache ... |
|
| The Airbag as a Supplement to Standard Restraint Systems in the AH-1 and AH-64 Attack Helicopters and Its Role in Reducing Head Strikes of the Copilot/ Gunner. Volume 1 |
JAN 91 |
50 pages |
| Authors:
Nabih M. Alem; Dennis F. Shanahan; John V. Barson; William H. Muzzy III; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Accident investigation records of U.S. Army helicopter crashes show injuries of pilots due to striking a structure inside the cockpit outnumber those due to excessive accelerations by a five-to-one ratio. This two-volume reports presents the results of a study of the effectiveness of airbags in reducing the severity of contact injury to the gunner when striking the gunsight. Airbag systems were installed on the gunsights in simulated Cobra and Apache ... |
|
| Effect of Vibration Frequency and Acceleration Magnitude of Chicken Embryos on Viability and Development. Phase 1 |
NOV 90 |
21 pages |
| Authors:
Linda C. Taggart; Nabih M. Alem; Helen M. Frear; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| There is little known about the effect of vibration on developing embryos. The feasibility of developing an avian model to study this effect was established in this study. One hundred chicken eggs were divided into four trays of 25 each and exposed to vibration of 1 Hz .25 G, 5 Hz 3 G, 10 Hz 3 G, and a control of no vibration. Hatch rate was 0 percent for 5 ... |
|
Reports by Author
