| An Investigation of the Effects of the DH-132 Helmet Suspension System Upon Perceived Helmet Weight under Static Conditions |
APR 1981 |
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| Authors:
R. Bradley Randall; HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
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 | The effects of the Standard 'A' DH-132 Combat Vehicle Crewmember (CVC) helmet suspension system upon perceived helmet weight were investigated. Twenty-three test participants were used in the experiment which evaluated their ability to judge helmet weight relative to a 62-ounce standard over a range of 42 through 82 ounces. A relatively narrow range of indecision--reference weight plus and minus 6-1/4 ounces--indicated that the CVC type of helmet suspension system made ... |
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| Development of Preliminary Sizing Criteria for Improved Goggles; Sun, Wind and Dust. |
JUN 1977 |
10 pages |
| Authors:
R. Bradley Randall; HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
|
 | This report presents design criteria for use by engineers and designers in the development of improved goggles for combat-vehicle crewmen. These criteria were derived from an analysis of relevant physical, anthropometry and interfacing equipment dimensions, both of which impose limits on goggles' dimensions. (Author) |
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| Human Factor Evaluation of the USMC M1955 Armored Vest and the Proposed Titanium Nylon Improved Conventional Munitions Protective Armored Vest (48 Plate). |
MAR 1973 |
77 pages |
| Authors:
Hayden A. Scheetz; Bernard M. Corona; Paul H. Ellis; R. Douglas Jones; R. Bradley Randall; HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
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| LL,R. Bradley ;HEL-TM-8-73(*body armor, *human factors engineering), titanium, anthropometry, nylon, performance(human), adaptation(physiology), firing tests(ordnance), performance(human), army equipmentA human factors evaluation of the Army Simplified 48-Plate Titanium/Nylon Armored Vest and the M1955 USMC Doron Armored Vest was conducted by the U.S. Army Human Engineering Laboratory. The vests were compared as to physical characteristics, anthropometric measurements, vest movement and static exercise, employment of small arms by troops equipped with the vests, and ... |
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| Survey of Esthetic Qualities of Military Helmets. |
JUN 1972 |
15 pages |
| Authors:
Paul H. Ellis; Bernard M. Corona; R. Douglas Jones; R. Bradley Randall; Hayden A. Scheetz; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| Using sketches of nine present and futuristic helmet forms, a survey was conducted to develop techniques to evaluate a user population's esthetic preferences for military helmets. The results showed that the M1 helmet had a high level of acceptance based on esthetic qualities. It was concluded that it is possible to find regularities in esthetic preference and that the M1 helmet can be used as a suitable reference style. An ... |
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| Perception of Symmetrically Distributed Weight on the Head. |
APR 1972 |
15 pages |
| Authors:
R. Douglas Jones; Bernard M. Corona; Paul H. Ellis; R. Bradley Randall; Hayden A. Scheetz; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| Thirty-eight enlisted men, 18 ordnance and 20 infantrymen, judged whether experimentally weighted helmets were heavier, lighter or the same weight as the reference M1 helmet. The findings indicate a lower difference threshold of 2.0 pounds and an upper difference threshold of 3.85 pounds for the combined groups. The ordnance group's lower difference threshold was 2.25 pounds, while the Infantry group's lower threshold was 1.8 pounds. The upper threshold for the ... |
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| The Effect of Helmet Form on Hearing: Free-Field Thresholds, |
APR 1972 |
20 pages |
| Authors:
R. Bradley Randall; Howard H. Holland; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| Audiometric threholds were determined for 12 subjects under three head conditions: bareheaded, while wearing an M1 helmet, and wearing an experimental helmet. The thresholds were measured for seven tones: 125, 250, 500, 1000, 2000, 4000 and 8000 Hz, at each of five angular orientations. Statistically noteworthy differences were studied for main effects and interactions. These appear to fall within the range of variation most people ordinarily experience on a day-to-day ... |
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| A Proposed Limit for Printed-Circuit Board Insertion Forces. |
MAR 1971 |
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| Authors:
R. Bradley Randall; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| A study was made to recommend a maximum force level that an individual inserting printed circuit boards (PCBs) into equipment by pushing with his thumbs would not have to exceed to fully seat the PCB. Twenty-four subjects pushed against a simulated circuit card with two handle orientations in each of two directions. Each subject exerted his maximum steady force for three to five seconds, and then 'lunged' to achieve the ... |
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| AN INVESTIGATION OF SPEED AND ACCURACY IN POSITIONING MISSILE-HANDLING VEHICLES, |
SEP 1968 |
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| Authors:
R. Bradley Randall; Wayne L. Spier; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| The purpose of this study was to determine how fast and accurately a simulated missile-reloading vehicle could be parked next to a simulated launcher. Both track-laying vehicles and trucks were tested at night and by daylight on four types of terrain. Five accuracy envelopes were examined; the vehicles were to be parallel and no further apart than 3, 6, 12, 24 or 48 inches. The drivers performed their tasks alone, ... |
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| CREW-COMPARTMENT TEMPERATUES: THE EFFECTS OF A SOLAR-HEAT REFLECTING PAINT. |
JUL 1966 |
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| Authors:
R. Bradley Randall; HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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| The study evaluated on olive-drab enamel that reflects solar heat. The evaluation compared temperatures inside two M113 Armored Personnel Carriers (APCs): one painted with the reflecting paint and the other with a conventional lusterless olive-drab finish. Over a five-day period, measurements at five locations on each APC revealed that temperatures were lower in the vehicle treated with the reflecting paint. Because this paint reduces the temperature of the vehicular skin ... |
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Reports by Author
