摘要
为了利用离心模型研究振动作用下土工结构的动力学行为,基于电液伺服驱动原理,研制一套可工作在100 g离心场环境中的电液伺服振动系统。该系统主要由机械系统、液压系统、电气系统和安全保护系统组成,可以实现离心场中大推力(800 kN)、快加速度(30 g)、高速度(0.75 m/s)、宽频带(10~350 Hz)振动载荷的单次或多次加载。通过不同离心过载环境和不同波形的测试试验,对电液伺服振动系统开展功能和有效性验证。结果表明:该系统可以在离心模型试验中对模拟土工结构开展不同振动波形条件下的响应分析,离心场中水平电液伺服振动系统的设计合理,能够满足指标参数要求;频率为10 Hz时,系统能够快速、精确地响应正弦波;系统能够快速、精确地响应随机波和地震波,但是随着频率升高,受伺服阀响应特性的影响,波形失真度会略有增加,为土工结构的抗震设计提供可靠的理论和试验依据。
In order to research the dynamic behavior of geotechnical structure under vibration by centrifugal model,based on the principle of electro-hydraulic servo drive,an electro-hydraulic servo vibration system working in 100 g centrifugal field was developed.The system was mainly composed of mechanical system,hydraulic system,electrical system and safety protection system,which could realize single or multiple loading of large thrust(800 kN),fast acceleration(30 g),high speed(0.75 m/s)and wide-band(from 10 Hz to 350 Hz)vibration load in the centrifugal field.The functions and effectiveness of the electro-hydraulic servo vibration system were verified by the tests under different accelerations and different waveforms.The results show that the system can conduct response analysis for the simulated geotechnical structures under different vibration waveforms in centrifugal model test.The design of the horizontal electro-hydraulic servo vibration system in a centrifugal field is reasonable and can meet the requirements of the index parameters.At a frequency of 10 Hz,the system can respond to sine waves quickly and accurately.The system can respond quickly and accurately to random waves and seismic waves,however,as the frequency increases,the waveform distortion will slightly increase due to the influence of the servo valve′s response characteristics,which provides reliable theoretical and experimental basis for seismic-against design of geotechnical structures.
作者
李心耀
舒杨
郭虎
温金鹏
陈文颖
LI Xinyao;SHU Yang;GUO Hu;WEN Jinpeng;CHEN Wenying(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang Sichuan 621900,China)
出处
《机床与液压》
北大核心
2025年第23期229-234,共6页
Machine Tool & Hydraulics
关键词
离心场
振动系统
电液伺服驱动原理
土工结构
centrifugal field
vibration system
principle of electro-hydraulic servo drive
geotechnical structures
