The torque monitoring of high-speed rotary shaft is often unsuccessful because of sensor installation, reliability, accuracy and other practical issues, so high-speed rotary shaft torque monitoring has become an urgent need. The brushless torque sensor is developed based on strain measurement, which transformed the torque to the deformation of the shell, the torque value is obtained by strain measurement of the shell, the measurement error is less than 4% by experimental verification. In a torque measurement of cold rolling mill main transmission shaft, the torque vibration data is verified by inherent characteristic simulation of rolling mill drive system, and the torque amplitude data is verified by motor power and speed signals. It is proved that the strain brushless torque sensor is feasible and the measurement result is correct, which provides a basis for other high-speed rotating shaft torque detection works.
Since the torque sensor is applied widely,it is necessary to study it.After analyzing the theory of typical elastic elements,the enforcing method for 5 forms of strain torque sensor are presented,in which strain,torsional deformation and natural frequency of torsional vibration is analyzed in theory and relative mechanical models are established respectively.Taking the minimum volume of torsion deformation as the goal function,the optimal design for the geometric dimension of the elastic element is conducted as well as the performance difference among different forms of toque sensors.Finally,a strain torque sensor is designed,and the FEA simulation of the sensor is completed,which result rectifies the mechanical model of torque sensor.Thus the computation problems in designing strain torque sensor are solved.
We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero.