三轴向振动试验系统及其关键技术研究
发布时间：2018-12-09 08:50
【摘要】：振动环境试验通过复现待试件在实际工况下所遭受的振动环境,以考核试件的振动力学性能和可靠性。相比于传统的单轴向振动试验系统而言,三轴向振动试验系统提供的模拟振动环境更加接近真实振动环境,且不易产生过实验或欠试验。本论文针对三轴向振动试验系统及其关键技术,对试验系统的设计、关键技术分析、相关控制策略的分析主要做了如下工作:(1)三轴向振动试验系统及关键技术分析。分析研究三轴向振动试验系统及其关键技术的发展,重点研究关键技术中的解耦补偿、系统辨识与系统设计等;(2)三轴向振动试验解耦补偿与系统辨识。试验系统的机械解耦选用双维一体式球保持型LM滚动导轨滑块配合正交分布的LM滚动导轨来实现;针对系统频响矩阵奇异的情况,使用广义逆代替频响矩阵的逆,使用奇异值截断法来实现控制解耦补偿;系统辨识分析结果表明传统的H_1、H_2、H_3和H_4辨识方法都是对系统的有偏估计,辨识精度不高,Hv估计法可以有效抑制系统辨识过程中干扰嗓声的影响从而提高系统辨识精度,获得高精度的系统阻抗矩阵;(3)三轴向正弦振动与随机振动控制策略的分析。在单轴正弦振动与随机振动控制策略的基础上,对三轴向振动试验系统的正弦扫频与随机信号功率谱复现过程进行研究,重点研究功率谱复现迭代修正闭环控制策略;(4)系统设计。根据三轴向振动试验系统试验要求,选择合适的三轴向电动振动台、振动控制器与功率放大器等,设计振动控制系统的硬件框架与软件结构,构建三轴向振动试验系统的实时控制框架,保证了系统的多通道数据实时传输、信号同步与实时处理。三轴向振动试验控制系统自闭环试验与现场试验结果表明:三轴向振动试验控制系统正弦扫频现场试验结果可以控制在±1.5dB容差带内;随机信号功率谱复现迭代修正闭环控制策略的自闭环试验与现场试验结果均在±3dB容差带内,表明实时控制系统与控制策略具有工程有效性。
[Abstract]:In order to test the vibration mechanical properties and reliability of the specimen, the vibration environment of the specimen was reappeared in the vibration environment test under the actual working conditions. Compared with the traditional uniaxial vibration test system, the simulated vibration environment provided by the triaxial vibration test system is closer to the real vibration environment, and it is not easy to produce experimental or under-test. Aiming at the triaxial vibration test system and its key technology, the design of the test system, the analysis of the key technology, and the analysis of the related control strategy have been done as follows: (1) the triaxial vibration test system and the key technology analysis. The development of triaxial vibration test system and its key technologies are analyzed and studied, with emphasis on decoupling compensation, system identification and system design. (2) decoupling compensation and system identification in triaxial vibration test. The mechanical decoupling of the test system is realized by using two-dimensional ball holding LM rolling guide slider and orthogonal distribution LM rolling guide. For the singular frequency response matrix of the system, the generalized inverse is used instead of the inverse of the frequency response matrix, and the singular value truncation method is used to realize the decoupling compensation. The results of the system identification analysis show that the traditional identification methods of Hstack 1 / H _ 2H _ S _ 3 and H _ s _ 4 are biased estimates of the system, and the identification accuracy is not high. The Hv estimation method can effectively suppress the interference noise in the identification process and improve the system identification accuracy and obtain the system impedance matrix with high accuracy. (3) Analysis of the control strategy of triaxial sinusoidal vibration and random vibration. Based on the control strategy of uniaxial sinusoidal vibration and random vibration, this paper studies the process of sinusoidal sweep frequency and power spectrum reproduction of random signal in triaxial vibration test system, and focuses on the iterative correction closed-loop control strategy of power spectrum reproduction. (4) system design. According to the test requirements of the triaxial vibration test system, the hardware frame and software structure of the vibration control system are designed by selecting suitable triaxial electric vibration table, vibration controller and power amplifier, etc. The real-time control framework of triaxial vibration test system is constructed, which ensures the real-time transmission of multi-channel data, signal synchronization and real-time processing. Self-closed loop test and field test results of triaxial vibration test control system show that the results of sinusoidal sweep frequency field test of triaxial vibration test control system can be controlled in 卤1.5dB tolerance zone. The results of self-closed loop test and field test of iterative modified closed-loop control strategy for random signal power spectrum are in 卤3dB tolerance band, which shows that the real-time control system and control strategy are effective in engineering.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB534.3
[Abstract]:In order to test the vibration mechanical properties and reliability of the specimen, the vibration environment of the specimen was reappeared in the vibration environment test under the actual working conditions. Compared with the traditional uniaxial vibration test system, the simulated vibration environment provided by the triaxial vibration test system is closer to the real vibration environment, and it is not easy to produce experimental or under-test. Aiming at the triaxial vibration test system and its key technology, the design of the test system, the analysis of the key technology, and the analysis of the related control strategy have been done as follows: (1) the triaxial vibration test system and the key technology analysis. The development of triaxial vibration test system and its key technologies are analyzed and studied, with emphasis on decoupling compensation, system identification and system design. (2) decoupling compensation and system identification in triaxial vibration test. The mechanical decoupling of the test system is realized by using two-dimensional ball holding LM rolling guide slider and orthogonal distribution LM rolling guide. For the singular frequency response matrix of the system, the generalized inverse is used instead of the inverse of the frequency response matrix, and the singular value truncation method is used to realize the decoupling compensation. The results of the system identification analysis show that the traditional identification methods of Hstack 1 / H _ 2H _ S _ 3 and H _ s _ 4 are biased estimates of the system, and the identification accuracy is not high. The Hv estimation method can effectively suppress the interference noise in the identification process and improve the system identification accuracy and obtain the system impedance matrix with high accuracy. (3) Analysis of the control strategy of triaxial sinusoidal vibration and random vibration. Based on the control strategy of uniaxial sinusoidal vibration and random vibration, this paper studies the process of sinusoidal sweep frequency and power spectrum reproduction of random signal in triaxial vibration test system, and focuses on the iterative correction closed-loop control strategy of power spectrum reproduction. (4) system design. According to the test requirements of the triaxial vibration test system, the hardware frame and software structure of the vibration control system are designed by selecting suitable triaxial electric vibration table, vibration controller and power amplifier, etc. The real-time control framework of triaxial vibration test system is constructed, which ensures the real-time transmission of multi-channel data, signal synchronization and real-time processing. Self-closed loop test and field test results of triaxial vibration test control system show that the results of sinusoidal sweep frequency field test of triaxial vibration test control system can be controlled in 卤1.5dB tolerance zone. The results of self-closed loop test and field test of iterative modified closed-loop control strategy for random signal power spectrum are in 卤3dB tolerance band, which shows that the real-time control system and control strategy are effective in engineering.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB534.3
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5 林，
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