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针对面角度现场测试需求,利用激光位移传感器的漫反射测量特性,搭建了面角度非接触测量装置,提出了一种结合三坐标测量机和位置敏感探测器对激光位移传感器进行空间坐标化标定的方法,从而构建出精确的面角度测量模型;采用蒙特卡洛法对面角度非接触测量装置的不确定度进行评定,在±25°测量范围内其结果为U=0.044°~0.046°(k=2);通过性能验证试验、重复性试验和稳定性试验对装置的性能指标进行考核,在±25°测量范围内其绝对测量示值误差不超过0.036°,重复性不超过0.004°,稳定性不超过0.021°;实验结果表明该基于激光位移传感器的面角度非接触测量装置准确可靠,具备开展面角度现场测试应用的前景。 相似文献
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本文介绍了利用多普勒效应进行离面位移检测的技术,提出测量光路,利用光栅差拍实现多普勒信号的有效分离,具有信号强、信噪比高的特点。实验表明该方法能可靠地用于物体离面位移的测量。 相似文献
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针对板结构大范围无损检测问题,发展一种基于软件虚拟聚焦的兰姆波换能器阵列检测方法,即基于相控阵中等相位叠加原理,在无需相位控制硬件系统条件下,通过对换能器阵列接收数据进行软件处理,实现换能器阵列声束的指向聚焦.利用仿真数据,研究阵列直径、阵元数量、声束数量等对虚拟聚焦成像周向分辨率和旁瓣噪声的影响,得出检测结果无明显旁瓣噪声所需要满足的条件为阵元间距应小于检测兰姆波的半波长.基于数值仿真处理结果,进行电磁声换能器阵列兰姆波检测试验研究.结果表明,在选择合适的阵列直径、阵元数量、声束数量的条件下,通过对换能器阵列检测信号进行虚拟聚焦处理,可以实现板结构任意方向特征体(如边界)的识别和缺陷检测. 相似文献
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结合叉车整机试验方法标准,确定针对电动叉车升降性能检测的方法。根据检测方法设计电动叉车升降性能检测系统。该系统基于激光位移传感器,利用PLC、组态软件,对叉车门架升降速度、最大起升高度等叉车升降性能参数进行检测。 相似文献
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提出将激光位移传感器应用于电子式万能试验机横梁位移误差检定的创新方法,解决了常规检定方法中标准器具量程不足、测量准确度较低,以及标准器具固定困难、测试手段复杂等问题。经实际应用,该方法操作便捷、数据可靠,为电子式万能试验机横梁位移误差的检定方法提供了一种新的参考。 相似文献
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激光三角测量传感器的精密位移测量 总被引:30,自引:1,他引:30
本文论述了激光三角法测量位移时,其象点位置随被测物面位移的变化规律;推导出激光散射用与成象角之间的关系;讨论了激光三角测量传感器结构参数的设计方法。 相似文献
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针对电磁超声波如何在非铁磁性金属板中产生的问题,研究了铝板中电磁超声波的产生和传播机理。利用有限元分析软件对铝板受偏置磁场作用,铝板内感生出涡流,在涡流的作用下产生洛伦兹力,最后在该洛伦兹力的作用下铝板内的质点发生位移形成电磁超声波的4个过程进行了仿真。仿真结果表明,通有高频电流的线圈正下方会感生出交变的涡流;在平行于铝板表面的静电场作用下,铝板表面上的质点受到垂直于其表面的洛伦兹力作用;板内质点在此垂直力的作用下振动产生电磁超声波;查看质点各个方向位移的变化直观地看出电磁超声波的衰减很大。最后通过对单个质点位移的仿真分析得出了质点位移最大的方向。 相似文献
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The objective of this research was to investigate the possibility of reducing the sizes of dyadic wavelet transform processor and dyadic wavelet inverse-transform processor using surface acoustic wave (SAW) devices. The motivation for this work was prompted by these processors which are of large sizes. Although these processors are being used, many fields need small size processors, so this work proposes two novel methods of reducing the sizes of these processors: firstly, the architecture which is that various interdigital transducers (IDTs) stand in a line is used to reduce the sizes of these processors. In this architecture, when the electrode-pairs numbers of various IDTs are larger than 20, the bulk acoustic wave (BAW) is eliminated, so this architecture cannot only reduce the sizes of these processors, but also eliminate BAW; secondly, as long as the electrode-overlap envelopes of IDTs will weaken fast with time t, the sizes of these processors are also reduced. 相似文献
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利用有限元软件COMSOL对声表面波标签进行了仿真,并实际制作标签进行了测试。标签的仿真包括特征频率仿真、叉指换能器激发效率仿真、回波特性仿真3个方面。通过网络分析仪对设计制作的3组标签进行了测试,实验结果表明:标签特征频率符合设计要求,叉指换能器孔径增大会提高其激发声表面波的效率,通过对回波脉冲幅值的判别可以实现对标签编码的识别。上述测试结果与仿真分析结果基本一致,表明了仿真研究的正确性。最后还将标签焊接在印刷偶极子天线板上组成标签系统并对该系统进行了无线测试,验证了声表面波标签的可用性。 相似文献
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This multi-part paper series gives evidence of tribothermally catalyzed, lubricative interactions of low partial pressures
of hydrogen, water vapor and oxygen with silicon and polycrystalline diamond employed as bearing materials in moving mechanical
assemblies (e.g., miniaturized rotors, bearings and gears) of microelectromechanical systems. In part I a test methodology
is described, whereby wide environmental range SEM-tribometric friction data are combined with friction noise analysis and
applicable literature information to further assist in interpreting atomic-level interactions governing the macroscopic friction
and wear behavior of Si and diamond. To further correlate the wear- and thermal desorption-induced generation, re(de)construction
and adsorbate-passivated annihilation of dangling σ bonds with high and low adhesion and friction, previously generated average
coefficient of friction (COF) values are complemented with the concept of the associated MAX.COF: the highest coefficient
of kinetic friction gleaned from the raw computer-logged friction force data of each oscillatory cycle of an experiment. The
MAX.COF/COF ratios are used as measures of the friction noise as a function of temperature and atmospheric environment. These
quantities, sampled at the appropriate data logging rate to circumvent test machine-related vibrational disturbances, demonstrated
signs of friction- and friction noise-reducing gas-phase interactions of dry hydrogen with silicon (part II) and diamond (part
III). Future installments will deal with similar lubricative properties of low partial pressures of wet hydrogen and dry oxygen.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献