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Multi-input multi-output random vibration control using Tikhonov filter

Chinese Journal of Aeronautics 2016年第6期29卷 1649-1663页

作者： Cui Song Chen Huaihai He Xudong Zheng Wei State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

Noises always disturb the control effect of an environment test especially in multi-input multi-output(MIMO) systems. If the frequency response function matrices are ill-conditioned, the noises in the driving forces will be amplified and the response spectral lines may awfully exceed their tolerances. Most of the major biases between the response spectra and the reference spectra are produced by the amplified noises. However, ordinary control algorithms can hardly reduce the level of noises. The influences of the noises on both the auto- and cross-power spectra are analyzed in this paper. As a conventional frequency domain method on the inverse problem, the Tikhonov filter is adopted in the environment test to suppress the exceeding spectral lines. By altering regularization parameters gradually, the auto-power spectra can be improved in a closed control loop. Instead of using the traditional way of selecting regularization parameters, we observe the coherence change to estimate noise eliminations. Incidentally, the requirement of coherence control can be realized. The errors of the phase are then studied and a phase control algorithm is introduced at the end as a supplement of cross-power spectra control. The Tikhonov filter and the proposed phase control algorithm are tested numerically and experimentally. The results show that the noises in the vicinity of lightly damped resonant peaks are more stubborn. The response spectra are able to be greatly improved by the combination of these two methods.

关键词： Coherence environmental testing Multi-input multi-output(MIMO) Noise Phase control Tikhonov filter

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Optimization Model for environmental Stress Screening of Electronic Components

引用

Journal of Systems Engineering and Electronics 2001年第1期12卷 29-33页

作者： Li Fang Institute of Systems Engineering, HUST, Wuhan 430074, P. R. China Zhu Cheng & Wang Wei Dept. of Management Engineering, Naval University of Engineering, Wuhan 430033, P. R. China Institute of Systems Engineering HUST Wuhan 430074 P. R. China Dept. of Management Engineering Naval University of Engineering Wuhan 43003 P. R. China

environmental stress screening (ESS) is a technological process to reduce the costly early field failure of electronic components. This paper builds an optimization model for ESS of electronic components to obtain the optimal ESS duration. The failure phenomena of ESS are modeled by mixed distribution, and optimal ESS duration is defined by maximizing life-cycle cost savings under the condition of meeting reliability requirement.

关键词： Electric fields environmental testing Failure analysis Life cycle Mathematical models Optimization Reliability

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维普期刊数据库

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Matrix Power Control Algorithm for Multi-input Multi-output Random Vibration Test

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Chinese Journal of Aeronautics 2011年第6期24卷 741-748页

作者： CUI Xuli CHEN Huaihai HE Xudong JIANG Shuangyan MOE Key Laboratory of Structure Mechanics and Control for Aircraft Institute of ~bration Engineering Research Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Both auto-power spectrum and cross-power spectrum need to be controlled in multi-input multi-output （MIMO） random vibration test. During the control process with the difference control algorithm （DCA）, a lower triangular matrix is derived from Cholesky decomposition of a reference spectrum matrix. The diagonal elements of the lower triangular matrix （DELTM） may become negative. These negative values have no meaning in physical significance and can cause divergence of auto-power spectrum control. A proportional root mean square control algorithm （PRMSCA） provides another method to avoid the divergence caused by negative values of DELTM, but PRMSCA cannot control the cross-power spectrum. A new control algorithm named matrix power control algorithm （MPCA） is proposed in the paper. MPCA can guarantee that DELTM is always positive in the auto-power spectrum control. MPCA can also control the cross-power spectrum. After these three control algorithms are analyzed, three-input three-output random vibration control tests are implemented on a three-axis vibration shaker. The results show the validity of the proposed MPCA.

关键词： multi-input multi-output environmental testing vibration control random vibration auto-power spectrum cross-power spectrum

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维普期刊数据库

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Explosion－insulated　Full　Optical　Fiber　Diferential－presure　Measuring　Instrument

引用

Semiconductor Photonics and Technology 1996年第4期 21-25页

作者： ① ZHENG Dezhong,WU Changqi,WANG Zhenchen,LI Zuofang (Yanshan University,Qinhuangdao 066004,CHN)

Ｅｘｐｌｏｓｉｏｎ－ｉｎｓｕｌａｔｅｄＦｕｌＯｐｔｉｃａｌＦｉｂｅｒＤｉｆｅｒｅｎｔｉａｌ－ｐｒｅｓｕｒｅＭｅａｓｕｒｉｎｇＩｎｓｔｒｕｍｅｎｔ①ＺＨＥＮＧＤｅｚｈｏｎｇ，ＷＵＣｈａｎｇｑｉ，ＷＡＮＧＺｈｅｎｃｈｅｎ... 详细信息

Ｅｘｐｌｏｓｉｏｎ－ｉｎｓｕｌａｔｅｄＦｕｌＯｐｔｉｃａｌＦｉｂｅｒＤｉｆｅｒｅｎｔｉａｌ－ｐｒｅｓｕｒｅＭｅａｓｕｒｉｎｇＩｎｓｔｒｕｍｅｎｔ①ＺＨＥＮＧＤｅｚｈｏｎｇ，ＷＵＣｈａｎｇｑｉ，ＷＡＮＧＺｈｅｎｃｈｅｎ，ＬＩＺｕｏｆａｎｇ（Ｙａｎｓｈａ...

关键词： environmental testing Microprocessor Optical Fiber Sensors

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