Electro-hydraulic vibration equipment(EHVE)is widely used in vibration environment simulation tests,such as vehicles,weapons,ships,aerospace,nuclear industries and seismic waves replication,etc.,due to its large outpu...Electro-hydraulic vibration equipment(EHVE)is widely used in vibration environment simulation tests,such as vehicles,weapons,ships,aerospace,nuclear industries and seismic waves replication,etc.,due to its large output power,displacement and thrust,as well as good workload adaptation and multi-controllable parameters.Based on the domestic and overseas development of high-frequency EHVE,dividing them into servo-valve controlled vibration equipment and rotary-valve controlled vibration equipment.The research status and progress of high-frequency electro-hydraulic vibration control technology(EHVCT)are discussed,from the perspective of vibration waveform control and vibration controller.The problems of current electro-hydraulic vibration system bandwidth and waveform distortion control,stability control,offset control and complex vibration waveform generation in high-frequency vibration conditions are pointed out.Combining the existing rotary-valve controlled high-frequency electro-hydraulic vibration method,a new twin-valve independently controlled high-frequency electro-hydraulic vibration method is proposed to break through the limitations of current electro-hydraulic vibration technology in terms of system frequency bandwidth and waveform distortion.The new method can realize independent adjustment and control of vibration waveform frequency,amplitude and offset under high-frequency vibration conditions,and provide a new idea for accurate simulation of high-frequency vibration waveform.展开更多
磁悬浮球作为质量块实现惯性式振动测量,测量磁悬浮球与测振系统壳体的相对位移即可得到被测振动体的振动参数。由于磁悬浮球不与任何物体接触、无机械摩擦、无机械间隙误差,与传统惯性式振动测量方法相比具有灵敏度高、测量上限频率高...磁悬浮球作为质量块实现惯性式振动测量,测量磁悬浮球与测振系统壳体的相对位移即可得到被测振动体的振动参数。由于磁悬浮球不与任何物体接触、无机械摩擦、无机械间隙误差,与传统惯性式振动测量方法相比具有灵敏度高、测量上限频率高,直接输出振动位移信号,通过微加工技术可实现体积小等优点,控制电路还可提供各类所需阻尼函数,但低于10 H z测量频率时需加大测试装置尺寸。在构建磁悬浮球模型及控制系统的基础上,通过对系统的结构和运行参数分析,推导了磁悬浮测振系统动力学方程,并将其等效成表征质量-弹簧测振系统的常系数二阶微分方程,使等效阻尼系数和刚度系数与质量-弹簧系统的参数有一定的对应关系。通过标准激振器产生不同的振动信号,测量结果验证了该方法正确。测试系统灵敏度:986 mV/g,测量频率范围:20 H z^5 kH z。该方法无需粘贴传感器、性价比高、操作方便。展开更多
基金Supported by National Natural Science Foundation of China.(Grant Nos.51605431,51675472)
文摘Electro-hydraulic vibration equipment(EHVE)is widely used in vibration environment simulation tests,such as vehicles,weapons,ships,aerospace,nuclear industries and seismic waves replication,etc.,due to its large output power,displacement and thrust,as well as good workload adaptation and multi-controllable parameters.Based on the domestic and overseas development of high-frequency EHVE,dividing them into servo-valve controlled vibration equipment and rotary-valve controlled vibration equipment.The research status and progress of high-frequency electro-hydraulic vibration control technology(EHVCT)are discussed,from the perspective of vibration waveform control and vibration controller.The problems of current electro-hydraulic vibration system bandwidth and waveform distortion control,stability control,offset control and complex vibration waveform generation in high-frequency vibration conditions are pointed out.Combining the existing rotary-valve controlled high-frequency electro-hydraulic vibration method,a new twin-valve independently controlled high-frequency electro-hydraulic vibration method is proposed to break through the limitations of current electro-hydraulic vibration technology in terms of system frequency bandwidth and waveform distortion.The new method can realize independent adjustment and control of vibration waveform frequency,amplitude and offset under high-frequency vibration conditions,and provide a new idea for accurate simulation of high-frequency vibration waveform.
文摘磁悬浮球作为质量块实现惯性式振动测量,测量磁悬浮球与测振系统壳体的相对位移即可得到被测振动体的振动参数。由于磁悬浮球不与任何物体接触、无机械摩擦、无机械间隙误差,与传统惯性式振动测量方法相比具有灵敏度高、测量上限频率高,直接输出振动位移信号,通过微加工技术可实现体积小等优点,控制电路还可提供各类所需阻尼函数,但低于10 H z测量频率时需加大测试装置尺寸。在构建磁悬浮球模型及控制系统的基础上,通过对系统的结构和运行参数分析,推导了磁悬浮测振系统动力学方程,并将其等效成表征质量-弹簧测振系统的常系数二阶微分方程,使等效阻尼系数和刚度系数与质量-弹簧系统的参数有一定的对应关系。通过标准激振器产生不同的振动信号,测量结果验证了该方法正确。测试系统灵敏度:986 mV/g,测量频率范围:20 H z^5 kH z。该方法无需粘贴传感器、性价比高、操作方便。
