共查询到18条相似文献,搜索用时 640 毫秒
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介绍了发动机试车台推力秤中心加载校准方法,并与平面加载校准方法进行了试验比较,进而得出相应结论. 相似文献
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由中国航空工业总公司第三0四研究所研制的《航空发动机试车台推力系统校准装置》课题已经完成,并于1995年4月26日在京通过部级鉴定。航空发动机推力的校准是发动机研制和生产面临的重要技术难题,它制约着新型飞机的发展。为解决这个关键技术,三0四所自1992年就开始技术攻关,经近4年努力,终于完成了这一课题。该课题系国防科工委标准计量局“八五”计划项目。鉴定会由中国航空工业总公司技术质量监督局主持,来自航空发动机研制、生产等单位的专家对课题进行了鉴定,认为该校准装置准确度高、零漂小,能够满足发动机推力校准及测量使用… 相似文献
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热敏电阻在液体火箭发动机试验中的应用 总被引:1,自引:0,他引:1
阐述了目前应用于低温推进剂液体火箭发动机试验的热敏电阻温度传感器的特点,介绍了热敏电阻温度传感器在液体火箭发动机试验中的应用方案,包括信号变换器设计、传感器校准数据处理方法、传感器自热效应分析以及测量系统组成,分析了影响测量不确定度的因素,给出了应用热敏电阻温度传感器的测量不确定度小于0.3K。 相似文献
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This paper presents a calibration method for parallel manipulators using a measurement system specially installed on an external fixed frame.The external fixed frame is important as an error reference for calibration in certain operations,such as in the configuration of a parallel manipulator functioning as a machine tool where the workpiece is fixed to a worktable.The pose of the end-effector is measured using three digital indicators installed on the external fixed frame.To enable measurement,the end-effector is assumed to be a plane large enough that all digital indicators could touch.The error is defined as the difference between the theoretical and actual readings of the digital indicators.The geometric parameters of the parallel manipulator are optimized to minimize this error.This calibration method is low cost and feasible for compensating geometric parameter errors for a parallel manipulator.Optimal pose selection for the calibration is achieved using a swarm intelligence search algorithm.The method is implemented on a prototype of a six degrees-of-freedom(DOFs) Gough-Stewart platform constructed to function as a machine tool. 相似文献
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Based on the piezoelectric effect, a new type of piezoelectric thrust vector-measuring system for a rocket engine is designed, which is made up of four three-component piezoelectric force sensors, so that 12 output force signals can be generated. Using the theoretical mechanics, the reverse formulas for the thrust vector (namely, the misalignment angle and the offset) are deduced. In order to calibrate the measuring system, a special calibration platform is designed. The calibration results show that the non-linearity and cross talk of the designed piezoelectric thrust vector-measuring system are less than 1 and 5%, respectively. Finally, a practical loading experiment is performed to test the application performance of the thrust vectormeasuring system, and the experimental results prove that the thrust vector-measuring system can accurately measure both the magnitude and the direction of the thrust vector. 相似文献
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为提高大口径管道流量在线校准的准确度,建立了一套多声道超声测流装置,对其现场探头定位安装及几何测量方法进行了优化,并在研究流量计算模型的基础上进行了不同探头插入状态的实验室测试。在DN400的管道上安装交叉4声道超声探头,测试了3种探头插入状态,通过分析流量测量误差来得到最优化方案。实验表明,探头插入状态显著影响装置流量测量误差,随着插入深度的增加流量测量结果逐渐增大,但即使全突状态流量依然偏小;3种状态中全缩线性较好,经过系数修正后,全缩状态下超声测流装置计量准确性最高,达到0.2级;超声测流装置经过实验室测试与优化,可以满足1.0级大口径管道流量在线校准的要求。 相似文献