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HELICOPTER CRASHWORTHINESS PDF

crashworthiness tests and proposes actions to improve crash safety features for future rotorcraft designs. by. Roy G. Fox. Bell Helicopter Textron. Crashworthiness is the ability of a structure to protect its occupants during an impact. This is The primary reason is that ejection or exiting a helicopter is impractical given the rotor system and typical altitude at which Army helicopters fly. In aeronautics, first structural design requirements for better crash protection were established for military helicopters and light fixed-wing aircraft. Also, for all.

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This is commonly tested when investigating the safety of aircraft and vehicles. Unsourced material may be challenged and removed.

As the US Army ‘s doctrine changed, helicopters became the primary mode of transportation in Vietnam. This led to the consideration of additional protective devices such as airbags.

Transport safety Aviation accidents and incidents.

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Views Read Edit View history. Crashworthiness is assessed retrospectively by analyzing injury risk in real-world crashes, often using regression or other statistical techniques to control for the myriad of confounders that are present in crashes. You can help by adding to it. In the s and s, the Crashworthinees Army began serious accident analysis into crashworthiness as a result of fixed-wing and rotary-wing accidents. Work began to develop energy absorbing seats to reduce the chance of spinal injuries [1] during training and combat in Vietnam.

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Pilots were receiving spinal injuries in otherwise survivable crashes due to decelerative forces on the spine and fires. Depending on hepicopter nature of the impact and the vehicle involved, different criteria are used to determine the crashworthiness of the structure.

November Learn how and when to remove this template message. Heavy research was conducted into human tolerance, energy attenuation and structural designs that would protect the occupants of military helicopters. They have each developed their own authoritative safety requirements and conducted extensive research and development in the field.

The history of human tolerance to deceleration can likely trace its crashworthniess in the studies by John Stapp to investigate the limits of human tolerance in the s and s.

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Crashworthiness – Wikipedia

Crashworthiness may be assessed either prospectively, using computer models e. This section needs expansion. The intent of this guide is to assist engineers in understanding the design considerations important to crash-resistant military aircraft. Retrieved from ” https: Several criteria are used to assess crashworthiness prospectively, including the deformation patterns of the vehicle structure, the acceleration experienced by the vehicle during an impact, and the probability of injury predicted by human body models.

Injury probability is defined using criteriawhich are mechanical parameters e.

A common injury criterion is the Head impact criterion HIC. From Wikipedia, the free encyclopedia.

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Crashworthiness is the ability of a structure to protect its occupants during an impact. This page was last edited on 5 Septemberat Primary crash injuries were reduced, but secondary injuries within the cockpit continued to occur.

Please help improve this article by adding citations to reliable sources. Airbags were considered a viable solution to reducing the incidents of head strikes in the cockpit, and were incorporated in Army helicopters.