岩石試験用サーボ試験機の制御性
1988 年 104 巻 1200 号 p. 63-67
詳細
1988 年 104 巻 1200 号 p. 63-67
Optimizing the control of failure process of rock under uniaxialcompression testing using a linear combination of stress and strain as the control variable model analysis of servo-controlled testing machine was conducted in this study.
At first stage, supposing a linear rock model, the characteristic polynomial of the machine-rock system was obtained and examined to reduce;
1) The control performance is influenced by the relaxation time of rock, the slope of stress-strain curve and the response time (natural frequency) of testing machine.
2) The relaxation time is found to be a function of control speed. So that the control performance is greatly influenced by the control speed.
The computer simulation was conducted using a non-linear visco-elastic rock model which was recently proposed by authors. The calculated results were compared with the experimental results. It was found that the non-linear simulation model is suitable, and mainresults of simulation are summarized in a diagram for quick reference.
