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首页> 外文会议>AHS International Annual Forum vol.2; 20070501-03; Virginia Beach,VA(US) >Longitudinal Tip-Path-Plane Measurement using an Optics-Based System
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Longitudinal Tip-Path-Plane Measurement using an Optics-Based System

机译：使用基于光学系统的纵向尖端路径平面测量

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In the summer of 2006, an optics-based tip-path plane measurement system was flown onboard a Bell 206 helicopter. The system is composed of two cameras that measure the longitudinal tip-path plane angle with respect to the fuselage and an air data boom fitted with a horizontal wind vane that measures the free-stream velocity with respect to the fuselage. A global positioning system and inertial mass unit were also included to compare the measurements of the imaging system with the theoretical tip-path plane for a given drag-to-weight ratio, flight path angle, and acceleration. In general, the tip-path plane angle measurements compared well with theory and proved highly repeatable for steady-state flight maneuvers. When linear regression is performed on the data recorded by both instruments, the standard deviation for the tip-path plane angle relative to the fuselage is 0.19° and the standard deviation of the free-stream velocity angle relative to the fuselage is 1.38°. Combined, these measurements report a longitudinal tip-path plane angle with a standard deviation of 1.35°. The results of the flight test also verified the first order principles that the longitudinal tip-path plane angle varies linearly with the square of the velocity and the sum of the flight path angle and acceleration.
机译：2006年夏天，贝尔206型直升机上安装了基于光学的尖端路径平面测量系统。该系统由两个摄像头组成，两个摄像头分别测量相对于机身的纵向叶顶路径平面角度和一个装有水平风向标的空气数据吊杆，该风向标测量相对于机身的自由流速度。还包括一个全球定位系统和惯性质量单位，以比较在给定的阻力重量比，飞行路径角度和加速度的情况下，成像系统的测量值与理论的尖端路径平面进行比较。一般而言，叶尖路径平面角测量值与理论值进行了很好的比较，并被证明对于稳态飞行机动具有高度可重复性。当对两种仪器记录的数据进行线性回归时，叶尖路径平面角相对于机身的标准偏差为0.19°，自由流速度角相对于机身的标准偏差为1.38°。结合起来，这些测量报告了纵向尖端路径平面角，标准偏差为1.35°。飞行测试的结果还证实了一阶原理，即纵向叶尖路径平面角与速度的平方以及飞行路径角与加速度之和成线性关系。

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