外文翻譯---基于c51兼容微處理器單片機(jī)的pwm控制器設(shè)計-單片機(jī)(已修改)
2025-06-01 10:17 本頁面
【正文】 大連交通大學(xué) 2020 屆本科生畢業(yè)設(shè)計外文翻譯 1 外文原文 Design of PWM Controller in a MCS51 Compatible MCU Introduction PWM technology is a kind of voltage regulation method by controlling the switch frequency of DC power with fixed voltage to modify the twoend voltage of technology can be used for a variety of applications including motor control, temperature control and pressure control and so on. In the motor control system shown as Fig. 1, through adjusting the duty cycle of power switch, the speed of motor can be controlled. As shown in Fig. 2, under the control of PWM signal, the average of voltage that controls the speed of motor changes with Dutycycle ( D = t1/T in this Figure ), thus the motor speed can be increased when motor power turn on, decreased when power turn off. : The Relationship Architecture of between Voltage of Armature PWM Module Therefore, the motor speed can be controlled with regularly adjusting the time of turnon and turnoff. There are three methods could achieve the adjustment of duty cycle: (1) Adjust frequency with fixed pulsewidth. (2) Adjust both frequency and pulsewidth. (3) Adjust pulsewidth with fixed frequency. Active steering control in the form of secondary yaw control (SYC) and actuated wheelset yaw (AWY)have been in prototype development. This paper presents a new active 大連交通大學(xué) 2020 屆本科生畢業(yè)設(shè)計外文翻譯 2 steering bogie design, actuated yaw force steering (AYFS), that is able to steer under high traction loads in tight curves. The AYFS bogie design is pared with the AWY design. The steering performance AWY under high traction loads has not been previously reported. This paper examines five control methods, three for AWY and two for AYFS bogies and assesses the traction curving and stability control performance of the alternative designs and control methods pared with each other and to passive steering bogie curving performance results showed considerable advantage in the proposed AYFS bogies over the AWY. It was shown that control must be applied to both the yaw angle and the steering angle of the bogie to achieve the best traction steering performance which was not possible with the AWY bogies. The proposed new bogie designs of AYFS overall give better traction curving and stability performance than the AWY designs. Active suspensions and more recently active steering has received increasing interest for highspeed train sets [1,2]. Active steering control in the form secondary yaw control (SYC) [3] and actuated wheelset yaw (AWY) [4] exist in developments up to prototype stage. SYC bogies control the bogie yaw angle Figure 1 and can improve the wear or creep force saturation at the wheel–rail contact which is the concern for hauling lootives. However, improvement is limited to the even distribution of wheelset angle of attack and flange contact forces. SYC bogies are more successful in improving stability and reducing track shi
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