共查询到19条相似文献,搜索用时 156 毫秒
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为了实时测量发动机的推力,通过对发动机推力销进行应变改装,进而通过应变测量的方法来获得发动机推力。将应变测量的电信号转换成发动机的推力数据,需要通过地面推力校准试验来获得推力销的应变和推力的对应关系。首先对某发动机推力销进行三维数值仿真有限元计算,得到推力销的应变分布规律,筛选出应变片粘贴位置。然后对推力销进行三次实验室推力校准加载试验,得到推力校准曲线和方程,并对试验结果进行了数据处理和分析,得到的推力校准方程的线性度、重复度和精度都很好,完全满足实时测量发动机推力的需求。 相似文献
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航空发动机试车台推力校准系统 总被引:1,自引:0,他引:1
《工程与试验》2015,(3)
介绍了发动机试车台推力校准系统的组成和校准方法、液压推力自动校准的工作原理,分析了试车台推力校准的滞后和不可重复性及推力测试中的误差分类、来源等。 相似文献
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航空发动机在试车过程中,推力测量精度会受到温度、湿度、压力、振动、电磁场等因素的影响。其中,温度对推力测量的影响较大,会导致传感器测力不准、试车台架形变等问题。本文设计了多种工况下的推力测量试验,分析温度因素对试车台推力测量精度的影响。由结果可知,采用传感器双向预紧的高精测量组件和传感器保温形式,对试车台测力精度的提高有显著作用。 相似文献
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某卫星液体火箭发动机推力偏心测试技术研究 总被引:1,自引:0,他引:1
卫星火箭发动机推力矢量测试,是一项高新技术火箭测试技术.根据某卫星液体火箭发动机推力矢量的特点和测量要求,阐述了待测推力矢量参数的定义,然后对转台测试原理和计算方法进行了简单的介绍. 相似文献
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Design, calibration and error analysis of a piezoelectric thrust dynamometer for small thrust liquid pulsed rocket engines 总被引:1,自引:0,他引:1
Small thrust liquid pulsed rocket engines operating in pulsed mode have gained a good reputation in attitude control applications for their potential reliability and efficiency. However, the pulsed characteristic creates a difficult measurement problem. In this paper, a novel thrust dynamometer with high natural frequency is developed for accurately measuring the pulsed thrust. It consists of two shear mode piezoelectric quartz crystal sensors and an integral shell. The sensors are inserted into unique double-elastic-half-ring grooves with an interference fit. Stiffness equations of the shell which are used to estimate the amount of interference are derived. The thrust dynamometer is calibrated both statically and dynamically. Static calibration uncertainty is evaluated. A trapezoidal impulse force is used to simulate the pulsed thrust for further characterizing the dynamic measurement performance of the thrust dynamometer. An evaluation algorithm of dynamic error is presented and used to evaluate the results of the dynamic simulation. The results show the thrust dynamometer has high sensitivity and natural frequency, good linearity and repeatability, and excellent dynamic performance. It can accurately trace trapezoidal thrust signal of 50 Hz without waveform distortion. 相似文献
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发动机性能飞行试验中,关键因素之一是确定发动机进口空气流量。考虑到发动机空中性能确定是一个非常复杂的过程,在飞行试验中,应准备多种方案互为备份,以防止某一特定方案由于若干测量参数失效而无法使用。所以,本文参考和改进了应用于国外某大涵道比发动机的高压涡轮导向器喉道截面流量函数计算法,根据地面台架校准试验,获取基于小涵道比涡扇发动机的高压涡轮导向器喉道无量纲组合参数,将其应用到飞行试验中,利用能量守恒和流量守恒,即可得到发动机进口空气流量。计算结果显示,与Gasturb软件计算结果吻合度高。最后,进行了参数敏感性分析,确定出试验中测量需求精度高的参数,这对小涵道比发动机试飞以及性能确定有很重要的意义。 相似文献
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基于光学压力测量技术的基本原理,对自组建测量系统和ISSI成品化测量系统分别进行校准试验,经过对试验结果的对比,得到光学测压过程中图像采集系统的性能和设置会对试验结果有一定的影响,其采集的光强度和对干扰光的过滤是影响校准和处理精度的关键因素。所采集到的图像信噪比越大,获得的压敏涂料校准曲线斜率越大,线性度越好。 相似文献
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从QR机型发动机台架实验动力性能与标定动力性能指标存在较大偏差的实际出发,分析了造成发动机动力性能偏低的主要原因,提出了整改方案,并做了进一步的台架实验验证,通过对实验数据的整理总结,从模具、加工、设计等方面,对影响发动机动力性能的相关零件进行了优化,最终完善了产品的动力性能。 相似文献
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Jinkun Lee Inyoung Yang Sooseok Yang Jae Su Kwak 《Journal of Mechanical Science and Technology》2007,21(4):664-671
The altitude engine test is carried out to measure the performance of the engine of flight vehicle at the high altitude environment
prior to the flight test. During the test, The measured pressures and temperatures at various positions, air flow rate, fuel
flow rate, thrust of the engine are measured. These measured values are used to calculate the representative performance values
such as the net thrust and the specific fuel consumption. Hence each of the measured parameter has effects on the total uncertainly
of the performance values. In this paper, the combined standard uncertainties of the net thrust and the specific fuel consumption
were estimated from the uncertainties of the various measured values. Also, by estimating the repeatability and the reproducibility,
the confidence levels of the altitude engine test were validated by the analysis of variation on the repeated test data by
different tester groups. 相似文献
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