Time filter

Source Type

Xu J.,Harbin University of Science and Technology | Xu J.,The Higher Educ Key Laboratory For Measuring And Control Technology And Instrum Of Heilongjiang Prov | Yuan Y.,Harbin Institute of Technology | Nie J.,Harbin Dongan Auto Engine Co. | And 4 more authors.
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2013

To eliminate the influences of signals such as vibration noises of roundness measurement, a Gaussian filter is taken as the measurement signal processing filter, and a new implement method for Gaussian filter is provided. A rational fraction approximation model is established based on the rational interpolation approximation. The corresponding parameters are calculated by matrix operation and an approximation filter of Gaussian filter is concluded. The maximum amplitude error of the ideal Gaussian filter and its approximation filter is less than 1% and the maximum amplitude error in the cutoff undulations is less than 2‰. A zero phase shift digital filter is concluded through the forward difference transform and backward difference transform. The corresponding digital filtering algorithm has the simple structure of one cascade zero phase shift filtering and high computing efficiency. The edge effect of digital filters is solved through the cycle continuation of roundness measurement signals.


Xu J.,Harbin University of Science and Technology | Xu J.,The Higher Educ Key Laboratory For Measuring And Control Technology And Instrum Of Heilongjiang Prov | Guo X.,Harbin University of Science and Technology | Guo X.,The Higher Educ Key Laboratory For Measuring And Control Technology And Instrum Of Heilongjiang Prov | And 2 more authors.
Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering | Year: 2013

In surface measurement data acquisition system, the design method of "analog filter and digital filter" was put forward for the design of the anti-aliasing filter. The anti-aliasing digital filter of finite impulse response (FIR) with linear phase was designed and the corresponding amplitude-frequency characteristic and phase-frequency characteristic were concluded, which satisfy the requirements of signal processing in surface measurement. Compared with the traditional single analog anti-aliasing filter, this method has better filtering effect, effectively reduces the design requirements of the analog filter and makes it easier to realize. This method is applied in the surface measurement system and the application experiment on the measured data verifies the performance of the filter.

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