机电液复合式软启动无级调速传动系统研究

发布时间：2018-03-09 23:20

本文选题：软启动　切入点：差动行星轮系　出处：《湖南大学》2013年硕士论文　论文类型：学位论文

【摘要】：近年来，，随着国民经济的发展，大功率重载机械设备在各个行业应用很广泛。大功率电机负载启动会产生5～7倍于额定电流的启动电流，对电机、电网产生很大冲击。大功率设备瞬时断电停机方式会给设备带来较强冲击。多工况交替的大功率设备平稳运行也是个大难题。要解决上述问题，需要对大功率设备采用真正的可控软启动/无级调速技术。本文采用差动行星轮系传动机构，并结合流体传动控制技术对整个机械传动装置进行控制，既实现主电机的空载启动，又采用流体传动的连续可控性，对重载机械设备的工作机构实现软启动、无级调速、软停机以及自重下放等功能。本文可为大功率设备的可控机械软启动/调速技术奠定良好的理论基础，对我国大功率重载机械设备关键共性技术的发展具有重要意义。本文主要开展的工作如下： 1、研究了机电液软启动系统的工作原理，对工作机构的软启动、软停机、自重下放各阶段进行了动力学分析，建立数学模型，对数学模型进行数字化仿真,得到了液压泵出口压力的变化规律。 2、把机械传动系统的三维装配模型导入到ADAMS动力学仿真软件中，建立动力学仿真模型并进行仿真试验。仿真结果表明，工作机构的软启动、软停机、自重下放各阶段的运动规律与设计值基本相符，验证了数学模型的正确性。 3、以高速级行星轮系、低速级行星轮系和锥齿轮对的体积为优化目标，在满足外界要求的约束条件下，建立优化数学模型。用MATLAB软件中的fmincon函数来对数学模型进行优化求解，得到最优结构参数，减少了金属材料用量，降低了生产制造成本。
[Abstract]:In recent years, with the development of national economy, high-power heavy-duty mechanical equipment is widely used in various industries. The power grid has a great impact. The instantaneous shutdown mode of high-power equipment will bring a strong impact to the equipment. The smooth operation of high-power equipment with alternate multi-working conditions is also a big problem. It is necessary to adopt the real controllable soft start / stepless speed regulation technology for the high power equipment. In this paper, the differential planetary gear train transmission mechanism and the fluid transmission control technology are used to control the whole mechanical transmission device. It not only realizes the main motor's no-load start, but also adopts the continuous controllability of the fluid drive, realizes the soft start to the working mechanism of the heavy duty mechanical equipment, and stepless speed regulation, This paper can lay a good theoretical foundation for the soft-start / speed regulation technology of controllable machinery for high-power equipment, and it is of great significance for the development of key common technologies of high-power and heavy-duty mechanical equipment in China. The main work of this paper is as follows:. The main contents are as follows: 1. The working principle of the electromechanical and hydraulic soft start system is studied. The dynamic analysis of the soft start, soft stop and download of the working mechanism is carried out, and the mathematical model is established, and the digital simulation of the mathematical model is carried out. The variation law of outlet pressure of hydraulic pump is obtained. 2. The 3D assembly model of the mechanical transmission system is introduced into ADAMS dynamic simulation software, and the dynamic simulation model is established and the simulation experiment is carried out. The simulation results show that the working mechanism starts and stops. The law of movement in each stage of weight-down is basically consistent with the design value, which verifies the correctness of the mathematical model. 3. Taking the volume of high speed planetary gear train, low speed planetary gear train and bevel gear pair as the optimization target, the optimization mathematical model is established under the constraint condition which meets the external requirements. The optimization model is solved by fmincon function in MATLAB software. The optimum structure parameters are obtained, the amount of metal material is reduced, and the production cost is reduced.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH132

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