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| A Control System Design of Non-Stationary Random Vibration Experiment |
| Received:November 04, 2021 Revised:December 17, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.03.014 |
| KeyWord:non-stationary random vibration time varying RMS normalization control system |
| Author | Institution |
| DENG Ting |
Institute of Systemic Engineering, China Academy of Engineering Physics, Mianyang , China |
| YAN Xia |
Institute of Systemic Engineering, China Academy of Engineering Physics, Mianyang , China |
| WANG Yu-fei |
Institute of Systemic Engineering, China Academy of Engineering Physics, Mianyang , China |
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| Abstract: |
| To control the non-stationary random vibration system, based on the traditional control theory of random vibration experiments, a new control for the random experiments was proposed in the condition of non-stationary continuous vibration. The non-stationary random vibration process of time varying Root Mean Square (RMS) was approximately equivalent to a product model of RMS and PSD spectrum. The normalized driving spectrum was calculated in real time, and the driving signal was updated by root mean square real-time following control strategy to realize continuous non-stationary random vibration control. The control arithmetic actualized through software program, and designed a control system of non-stationary random vibration experiments by Industrial Personal Computer, embedded real-time controller, data acquisition module. The control system was connected with the shaking table test system to carry out the verification test. Results showed that the normalized PSD spectrum control precision was less than ±3 dB, and the control effect and accuracy can meet the design requirements. In conclusion the designed control system can synchronously follow and keep the reference RMS with a design-satisfied control effect. |
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