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  displacement measurement
3D displacement measurement by white light digital image analysis in frequency domination area
      
However, multipath effects and low sampling frequencies affect the accuracy of GPS for displacement measurement.
      
The sensitivity of the displacement measurement is Δxmin=5?fm with a 1?Hz bandwidth.
      
The prospects of reaching the standard quantum limit in an interferometric displacement measurement using a macroscopic oscillator are discussed.
      
The excess noise contribution of this test mass jitter onto the sensitive displacement readout was completely subtracted by fitting the angular interferometric data streams to the longitudinal displacement measurement.
      
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  displacement measuring
To reduce or eliminate speckle noise, we developed a new optical stylus profiling system consisting of a displacement measuring part using a knife-edge and a speckle noise measurement part.
      
The resolution of this (combined) displacement measuring method was assessed on translation and uniaxial tensile tests to be 5 nm for in-plane displacement components and 1.5 nm for out-of-plane motion over the same area.
      
Operation of conventional displacement measuring interferometers requires a co-operative target and an accurate alignment procedure.
      
This unit is used as the blade displacement measuring sensor of our wafer slicing machines.
      
This estimate presumes that a tension test frame, having associated load and displacement measuring capabilities, is available.
      
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  displacement measure
Both displacement measure ments were obtained by means of variable-resistance slide-wire potenti ometers.
      
Three weights are proposed a 3D-measure, a 2D-displacement measure and a network simplification measure.
      


This paper is presented to discuss emphatically the characteristics of comp- ressive deformation of marble under the three-dimentional stress states and the researches of the influences on stress-strain relationship,strength,and failure mechanism by different loading paths.The tests that have been conducted inc- luded the constant confining pressure repeated loading,constant stresses,equal proportional loading or unloading,the hydrostatic and uniaxial tests. The Model CBS-2 digital displacement apparatus manufacfured...

This paper is presented to discuss emphatically the characteristics of comp- ressive deformation of marble under the three-dimentional stress states and the researches of the influences on stress-strain relationship,strength,and failure mechanism by different loading paths.The tests that have been conducted inc- luded the constant confining pressure repeated loading,constant stresses,equal proportional loading or unloading,the hydrostatic and uniaxial tests. The Model CBS-2 digital displacement apparatus manufacfured by our ins- titute was used for measurement in these tests.The probes were directly fixed between the top and bottom fillers of specimen in a high pressure clyinder.It could be used to measure the deformation of specimen after failure,consequent- ly,there has a sufficient range for measuring deformation than that of electric strain gauge. The stress-strain relationships for different loading paths are given,and the author proposed some opinions to these problems.

本文着重讨论大理岩在三向应力状态下压缩变形特性试验研究.探讨了不同的加荷路径对应力-应变关系、强度及破坏机制等的影响.进行了恒侧压、反复加压、等比加压、应力常量,卸荷等试验研究,此外还进行了无侧向应变及静水压等试验.该试验采用了我所自制的 CBS-2型数字显示位移测量仪进行测量,探头直接固定在高压筒体内岩样上下垫块之间,可以测出岩样破裂后的变形,克服了过去采用电阻片量程不够的问题.本试验得出了不同加荷路径的应力-应变关系曲线,提出了一些看法.

Laser-speckle method. though having many advantages over other ones, is not widely used yet owing to the difficulties to determine correct displacement direction and lack of reasonal analysis of measuring displacement. errors and the displacement derivative. A method to determine the measured displacement direction and an analysis of measuring errors are presented, and several means of improving measurement accuracy are suggested.

激光散斑法是测量平面面内位移的一个有效的方法。该方法比起实验应力分析的其他方法来具有许多优点,但是由于在应用该方法时仍存在一些困难,如位移正负方向难以确定和缺乏对位移的测量结果和位移导数详细、合理的分析,因而该方法还不能广泛地应用于工程,针对这种情况,作者在本文提出了判定位移正负方向的一个方法并对位移导数的实验结果进行了详细、合理的讨论,提出了几种改进精度的有效措施。

In this papaer a method of identification of modal parameters in the resonance zone is put forward. The weighted least square calculation and the linear regression analysis are carried out by using the measured displacement values when the objccts are kept in an excited resonant state. The dynamic physical parameters and approximate expressions both of damping and modal stiffness are obtained. The results comparing with those obrained from the pulse method are rather close.

本文提出了在共振区的模态参数识别的方法。利用激发共振时的位移测量值,进行了加权最小二乘方法的计算和线性回归分析,得到了动态物理参数(阻尼和模态刚度)的近似表达式,其结果与脉动法所得结果比较接近。

 
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