共查询到18条相似文献,搜索用时 171 毫秒
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对气体动态压力的非接触测量和溯源方法进行了研究。研制了基于激光干涉法测量气体脉冲压力的实验装置,通过光程与压力关系计算分析出气体脉冲压力的幅值和脉宽。建立了动态压力测量模型,并对测量不确定度进行了分析。开展了气体脉冲压力激光干涉测量实验,使用动态压力传感器和激光器进行同步测量,激光干涉法测量结果偏差较小,验证了装置测量的准确性。结果表明:本装置产生的脉冲压力信号稳定可靠,光学测量信号准确度高,具有实时性、非接触、可溯源等优点,可实现气体脉冲压力的测量,装置测量结果的相对标准偏差小于0.8%,测量结果的不确定度小于2%(k=2)。 相似文献
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测力仪器在动态力测量与静态校准中的表现有较大差异,因此动态力校准对广泛使用的动态载荷测量有重要意义。本文首先对两种典型的动态力校准方法及相应装置的能力状态进行简单介绍;然后结合实际校准与测量工作提出动态力校准中存在的一些问题,并指出动态力校准装置的力传递形式及相关设计参数对校准结果有较大影响;最后对提出的问题进行梳理分类,并探讨解决问题的基本思路与原则,为建立动态力校准装置给出需要考虑的设计参数,也为编制动态力校准的规范提供必要的依据。 相似文献
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为提高准静态环境使用的力传感器校准精度,研制了基于伺服驱动的离心式动态力校准装置。该装置利用直驱伺服电机驱动和控制质量块做离心运动,通过去轴承设计的动力传动机构输出量值可控的动态力;建立了动力学模型并得到了实验验证;进行了测量重复性和动态响应性能实验研究。实验结果表明,校准装置在中高转速下测量重复性优于1%,能在0.242s内加速到额定转速500r/min,且输出力值可达到3.8kN。 相似文献
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Noninvasive sensors to detect human physiological parameters are becoming more and more important. This is especially useful to monitor driver state as driver-vehicle system is a safety-critical system. Unfortunately, current technologies in these noninvasive sensors development are not satisfactory. In this research, we developed an intelligent integrated device called "smart wheel" to monitor drivers' physiology. Specifically, a group of polyvinylidene fluoride (PVDF) sensor, semiconductor temperature sensor, and piezoresistive sensor were integrated into a driving steering wheel. The developed device has the capability of measuring a driver's pulse wave, breathing wave, skin temperature, and gripping force in a noninvasive manner and in real time. A pilot experiment was carried out to verify the pulse wave measurement of this intelligent sensor and the result was found satisfactory 相似文献
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R. Meyer 《Materialwissenschaft und Werkstofftechnik》1979,10(12):449-455
The Prevention of Inertial Force Measurement Inaccuracies Encountered in Pendulum-type Dynamometers Test machines, which are equipped with a force measuring device utilizing the inclining pendulum, are subject to dynamic measurement inaccuracies due to the inertia of the pendulum. The initial discussion demonstrates that the dynamic inaccuracy of measurement encountered with test machines using an inclining pendulum – force measurement device can only be calculated for the complete test machine/test piece configuration. With reference to the results of experiments, it will be proved that, as with the experiments carried out by Kravcenko, the indicated dynamic force and the dynamic force in the testpiece are antiphase and unequal. Additionally it will be shown that, through the experiment results, the equation from Schultze/Baumann for the permissible rate of test is confirmed only in the interpretation from Kravcenko. Further equations concerning the limitations of the rate of test are shown and their relevant fields of applications are discussed. Finally, factors are presented which stipulate a reduction of the permissible rate of test or permit an increase in this rate, dependent upon the force-elongation characteristic of the test piece and the measured variable under consideration. 相似文献
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激光干涉法进行正弦力校准研究 总被引:5,自引:0,他引:5
采用绝对法进行正弦力校准,动态力由安装在振动台上的质量块产生,力值根据力的定义直接溯源到质量、加速度和时间。为了减少测量不确定度,质量块上的加速度分布必须进行准确测量。文中介绍了采用激光干涉法进行动态力校准的原理和信号处理方法,同时介绍了与德国PTB加速度实验室进行加速度测量的比对情况。结果表明,采用所介绍的正弦力校准方法可以提高校准的准确度。 相似文献
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VHDL作为一种硬件描述性语言,主要用于设计大规模铁数字硬件系统和电路,随着电路的规模加大,复杂度增加,这种语言的优越性越来越明显,它正在逐渐成为电子设计师们设计数字硬件电路时所必须掌握的工具语言,在动态存储测试领域中,由于被测对象复杂多样,要求一次记录的信息量不断增加,而允许放置测试仪器的空间很小,因此用VHDL设计大规模集成电路估动态存储测试领域中具有广泛的应用前景。 相似文献
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