Effects of body-borne equipment on occupant forces during a simulated helicopter crash

Effect of body-borne equipment on injury of military pilots and aircrew during a simulated helicopter crash

“…A further correlation study was therefore conducted on the seat load and the time at which maximum lumbar load occurs, and a Pearson correlation value of 0.979 was calculated, indicating, that time at maximum lumbar load correlates directly to the seat load. This agrees with Aggromito et al, 2014 in that the earlier that the bottoming-out condition occurs, the greater the chance that the lumbar loads will increase. Unlike that model, however, there are also other important factors that contribute to the increase in lumbar load such as the equipment location.…”

“…The FE dummy model used is a Hybrid III fully deformable 50th percentile ATD developed by FTSS. The seat is a simplified BAE UH-60 seat utilising a fixed load energy absorption device, with a load profile taken from (Aggromito et al, 2014). Tests were performed according to MIL-STD 58095A Test 4 to investigate equipment placed at various locations and representative equipment shapes.…”

Crashworthy design and energy absorption mechanisms for helicopter structures: A systematic literature review

“…However, the helicopter occupants must carry increasing amounts of equipment to meet their mission. In order to understand the influence of increasing mass on the survivability, Aggromito et al [257] proposed a linear mass-spring-damper model with 7-degrees-of-freedom to simulate a helicopter occupant wearing body-borne equipment on a seat. Fig.…”

An improved spinal injury parameter model for underbody impulsive loading scenarios

“…There are a variety of other lumped models as listed in Liang and Chiang to characterize the motion of human body in the vertical direction. Even though these models were mostly one dimensional, models such as Wan and Schimmels were used in Aggromito et al to study the effect of body‐borne masses under helicopter crash loading scenarios. Du et al formulated a combined finite element and multibody of the thoracolumbar spine and pointed out that the when compared with a normal posture, the relaxed posture had 43%, 10%, and 13% increase in stress on the cortical wall, endplate, and intradiscal pressure, respectively, thus increasing the chances of spinal injury in a relaxed posture.…”