基于plc的張力控制系統(tǒng)的發(fā)展(英文翻譯)-展示頁
2024-11-14 08:14本頁面
【正文】 fed back to the PLC system to pose a closed loop system. The mechanism of the system is shown in . The main ponents in the system include (1) A Panasonic programmable controller (FP0C10RS), a 12bit FP0A80 and an FP0A04V ancilliary conversion module. (2) A Panasonic AC digital servo driver and servo motor. (3) A radiusfollowing device including a radiusfollowing arm and a rotary potentiometer. 2 Mathematical Mode Effective control of the fiber tension is required in fiber winding. Due to the versatility of the core mold shape and winding shape, the linear speed of the fiber is difficult to be kept constant and the variation principle is extremely plex. Therefore, the influence of the speed on the tension force should be taken into consideration in the mechanical analysis of the controlled object. The PLC with function modules as the control system’s control kernel, and the needed tension can be enacted from manmachine interface through the serial munication between PLC and upper puter. The input of the radius value, the torque feedback and the velocity feedback, the running of the preset calculating algorithm and the output of the system are done by the PLC with function modules. When the unwinder is considered, the dynamic torque equilibrium equation can be expressed as follows M (t ) = J (t )ω? (t ) + J? (t )ω (t ) +TR(t ) + Mf + M0 （ 1） where T is the yarn tension, R(t) is the realtime scroll radius, M(t) is the resistant moment of the AC servo motor, Mf is the viscous frictional moment, ω(t) is the angular velocity of the scroll, J(t) is the rotating inertia of the scroll and the yarn roll, and M0 is the dry frictional moment. As shown in Eq.(1), the scroll radius, the resistant moment, the angular velocity of the unwinder and the rotating inertia of the scroll are all functions of time, and the system is thus a plex multivariable timevarying system. Proper simplification of the torque equilibrium equation is carried out with classical control theory based on the following rules: (1) The dry frictional moment and the viscous frictional moment are very little and may be ignored. (2) The influence of J? (t )ω (t ) on the tension force may be ignored since the instantaneous inertia changes very slightly. (3) The scroll radius is realtime measured and fed back by the radius following .(1) is then simplified as TR(t) = M(t) + J (t )ω? (t ) (2) Therefore, the variations of scroll diameter and scroll angular velocity are the main influencing factors of the yarn tension. 3 Compensation of the Radius of the Scroll The radius change of the scroll causes the change of the scroll moment, ., the change of the TR(t ) in Eq.(2). One end of the radius following arm touches the scroll, and the other end is connected to the rotary potentiometer via gear magnifying structure, thus transforming a change in the spindle radius to a change of voltage, as shown in where L is the length of radius following arm, Rmax is the maximum radius of scroll, and R(t ) is the instantaneous scroll radius. Suppose the transmission ratio of the gear is i , then the
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