摘要
介绍了新研制的空心圆柱试样真三轴仪内外腔加载压力独立控制的机电液光一体化电液伺服加载装置,以及由步进电机独立控制沿试样轴向方向的载荷和为实现主应力旋转在试样端面上施加设定的控制扭矩的加载装置。采用卡尔曼滤波及预报递推控制算法,克服步进电机加载系统与电液伺服加载装置响应速度不一致的问题,从而在连续加载试验中,使尽可能多的离散点遵循设定的加载应力路径。
The Paper describes the newly developed electro -hydraulic servo load-application units of a hollow cylinder specimen - shaped truly triaxial testing apparatus. These devices adopt the techniques of mechano, electro , hydro - optical integration to control the external and internal hydraulic pressure independently on the specimen walls and use two stepmotor-controlled units simultaneously to apply axial loading on top of the specimen and torque around its central axis to achieve the principal stress rotation. Adopting Kalman filter and predictor technique, the testing apparatus successfully overcomes the nonuniformity of the responses between the stepmotor and the electro - hydraulic loading systems ,thus to make the loading, unloading and reloading process follow the given stress-path on the sampling points. All the testing procedures are under the supervision of a IBM PC/XT microcomputer.
基金
高等学校博士学科点专项基金资助项目
关键词
空心圆柱试样
应力路径
三轴仪
holow cylinder specimen,stress-path control,Kalman filter and predictor.
