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Trajectory Analysis for Accident Investigation

机译：事故调查的轨迹分析

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The accident investigator is often faced with an in-flight breakup of an aircraft. In such cases, the wreckage is scattered over the ground and, depending on the pattern, it may be possible to determine some aspect of the state of the aircraft at breakup. Sometimes part of an aircraft, such as an engine turbine, leaves the aircraft, but the aircraft is able to continue to a safe landing or, alternatively, most of the aircraft is found but a piece is missing. In such cases, it is desirable to locate the shed part for analysis to determine the cause of the failure. To be considered a ballistic object for such analysis, an object must behave as having no organized lift. Most wreckage items will have a tumbling falling mode, which fits this category or "fly" in a tight circle around what can be described as a ballistic trajectory. This paper will discuss the equations needed to describe ballistic motion, which are simplified from the general simulation equations. It will then discuss general ballistic behavior and the cues a visual inspection of the scatter pattern can provide as to the breakup state. It will then present case studies from accident investigations.
机译：事故调查员经常面对飞机的飞机失事。在这种情况下，残骸散布在地面上，并且根据模式，有可能确定飞机在解体时的状态。有时，飞机的一部分（例如发动机涡轮机）会离开飞机，但是飞机可以继续安全着陆，或者找到了大多数飞机，但缺少了一部分。在这种情况下，期望定位棚部以进行分析以确定故障原因。要被视为此类分析的弹道物体，物体必须表现为没有组织的升力。大多数残骸物品将具有翻滚下落模式，该模式适合该类别或围绕可称为弹道的小圆圈“飞行”。本文将讨论描述弹道运动所需的方程式，这些方程式已从通用模拟方程式简化。然后，它将讨论一般的弹道行为，以及对散射模式进行目测检查的线索，可以了解破裂状态。然后它将提供事故调查中的案例研究。

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