基于降低脉动值的自调非同轴双输出脉冲发生机构的尺度综合及优化
发布时间：2018-11-05 09:50
【摘要】：机械工程技术发展趋势可以概括为:绿色、智能、超常、融合和服务,这也是未来机械制造业发展的走向。机构学作为现代制造业的基础,机构学的研究对于提高机械产品的自主设计、创新和国际竞争力至关重要。机械脉动式无级变速器是一类典型的六杆机构,新型式下研究其尺度综合、运动学动力学特征是对机构学的重要补充和发展。本论文为了发挥脉动式无级变速器的传动优势,开发具有较大功率、较高速度、运转较平稳和效率较高的新机型,在前人提出非同轴双输出脉冲发生机构的基础上,对该机构进行了深入研究,以降低机构脉动值为目标,通过MATLAB、SIMULINK、ADAMS、ISIGHT软件实现对机构的尺度综合、建模,仿真,对比分析以及尺寸参数优化,得出了一套满足性能要求的,脉动值较低的双输出脉冲发生机构;最后,为了降低由于过约束影响而导致机构成本的增高,提高机械系统的自适应性,完成了对该机构进行自调性结构设计。在研究过程中,以非同轴双输出脉冲发生机构为研究对象,分析机构的构型和运动特点,提出了等价机构的概念;以降低机构脉动值为目标,从理论上对等价机构的基本性能参数进行了分析研究,确定了等价机构尺度综合需要满足的运动学条件;对变杆长AC、AD的分析确定可将等价机构作为基础四杆机构进行设计,根据前面的分析对基础四杆机构的进行尺度综合;在前人研究基础上提出新的B点的确定方法,从而实现对非同轴双输出脉冲发生机构的尺度综合。应用SIMULINK、ADAMS建立机构模型,通过对仿真结果进行对比,验证仿真结果的正确性;利用仿真结果结合MATLAB进行数据分析,得到了双输出杆的速度、加速度的变化规律,以及机构平均输出角速度、脉动值及最大角加速度随曲柄长度增大而增大的变化规律,并且分析了构件AB和BCD的各杆长变化对机构双输出运动规律的影响。另一方面,本论文利用优化软件ISIGHT集成ADAMS和MATLAB,进行正交试验设计分析了各因子对于脉动值的影响,从而确定机构的有效设计空间,再利用自适应模拟退火法对机构进行优化设计,有效降低了非同轴双输出脉动发生机构的脉动值。通过“零过约束自调基本组”法完成了对非同轴双输出脉动发生机构的过约束分析与自调结构设计,通过仿真分析表明,在系统的输入、输出轴存在平行度误差的情况下,输出角速度的影响可以忽略不计,达到了预期效果。
[Abstract]:The development trend of mechanical engineering technology can be summarized as follows: green, intelligence, superfluous, fusion and service, which is also the development trend of machinery manufacturing industry in the future. As the foundation of modern manufacturing, the research of mechanism is very important to improve the independent design, innovation and international competitiveness of mechanical products. The mechanical pulsating stepless transmission is a kind of typical six-bar mechanism. The scale synthesis is studied in the new type. The kinematics and dynamics is an important supplement and development to the mechanism. In this paper, in order to give full play to the driving advantage of pulsating stepless transmission and develop new models with large power, high speed, stable operation and high efficiency, this paper proposes a non-coaxial double-output pulse generating mechanism. In order to reduce the pulsation value of the mechanism, the mechanism is studied deeply, and the scale synthesis, modeling, simulation, contrast analysis and dimension parameter optimization of the mechanism are realized by MATLAB,SIMULINK,ADAMS,ISIGHT software. A set of double output pulse generating mechanism with low pulsation value and satisfying the performance requirement is obtained. Finally, in order to reduce the increase of mechanism cost due to over-constraint and improve the adaptability of mechanical system, the self-adjusting structure design of the mechanism is completed. In the course of the research, the concept of equivalent mechanism is put forward by analyzing the configuration and motion characteristics of the mechanism, taking the non-coaxial double-output pulse generating mechanism as the research object. With the aim of reducing the pulsation value of the mechanism, the basic performance parameters of the equivalent mechanism are analyzed and studied theoretically, and the kinematics conditions which need to be satisfied by the scale synthesis of the equivalent mechanism are determined. According to the analysis of variable rod length AC,AD, the equivalent mechanism can be designed as the basic four-bar mechanism, and the scale synthesis of the four-bar mechanism can be carried out according to the previous analysis. On the basis of previous studies, a new method of determining B-point is proposed to realize the scale synthesis of non-coaxial double-output pulse generating mechanism. The mechanism model is built by SIMULINK,ADAMS, and the simulation results are compared to verify the correctness of the simulation results. By using the simulation results and MATLAB data analysis, the variation law of the velocity and acceleration of the double output rod and the variation law of the average output angular velocity, pulsating value and maximum angular acceleration of the mechanism with the increase of the crank length are obtained. The influence of the length of AB and BCD on the double output motion of the mechanism is analyzed. On the other hand, in this paper, the influence of factors on pulsation value is analyzed by integrating ADAMS and MATLAB, with optimization software ISIGHT, so as to determine the effective design space of the mechanism. Then the adaptive simulated annealing method is used to optimize the design of the mechanism, which effectively reduces the pulsation value of the non-coaxial double-output pulsating mechanism. The over-constraint analysis and self-tuning structure design of the non-coaxial double-output pulsation generating mechanism are completed by using the "zero-crossing constraint self-tuning basic group" method. The simulation results show that the parallelism error exists in the input and output axes of the system. The effect of output angular velocity can be neglected and the expected effect is achieved.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH112
本文编号：2311691
[Abstract]:The development trend of mechanical engineering technology can be summarized as follows: green, intelligence, superfluous, fusion and service, which is also the development trend of machinery manufacturing industry in the future. As the foundation of modern manufacturing, the research of mechanism is very important to improve the independent design, innovation and international competitiveness of mechanical products. The mechanical pulsating stepless transmission is a kind of typical six-bar mechanism. The scale synthesis is studied in the new type. The kinematics and dynamics is an important supplement and development to the mechanism. In this paper, in order to give full play to the driving advantage of pulsating stepless transmission and develop new models with large power, high speed, stable operation and high efficiency, this paper proposes a non-coaxial double-output pulse generating mechanism. In order to reduce the pulsation value of the mechanism, the mechanism is studied deeply, and the scale synthesis, modeling, simulation, contrast analysis and dimension parameter optimization of the mechanism are realized by MATLAB,SIMULINK,ADAMS,ISIGHT software. A set of double output pulse generating mechanism with low pulsation value and satisfying the performance requirement is obtained. Finally, in order to reduce the increase of mechanism cost due to over-constraint and improve the adaptability of mechanical system, the self-adjusting structure design of the mechanism is completed. In the course of the research, the concept of equivalent mechanism is put forward by analyzing the configuration and motion characteristics of the mechanism, taking the non-coaxial double-output pulse generating mechanism as the research object. With the aim of reducing the pulsation value of the mechanism, the basic performance parameters of the equivalent mechanism are analyzed and studied theoretically, and the kinematics conditions which need to be satisfied by the scale synthesis of the equivalent mechanism are determined. According to the analysis of variable rod length AC,AD, the equivalent mechanism can be designed as the basic four-bar mechanism, and the scale synthesis of the four-bar mechanism can be carried out according to the previous analysis. On the basis of previous studies, a new method of determining B-point is proposed to realize the scale synthesis of non-coaxial double-output pulse generating mechanism. The mechanism model is built by SIMULINK,ADAMS, and the simulation results are compared to verify the correctness of the simulation results. By using the simulation results and MATLAB data analysis, the variation law of the velocity and acceleration of the double output rod and the variation law of the average output angular velocity, pulsating value and maximum angular acceleration of the mechanism with the increase of the crank length are obtained. The influence of the length of AB and BCD on the double output motion of the mechanism is analyzed. On the other hand, in this paper, the influence of factors on pulsation value is analyzed by integrating ADAMS and MATLAB, with optimization software ISIGHT, so as to determine the effective design space of the mechanism. Then the adaptive simulated annealing method is used to optimize the design of the mechanism, which effectively reduces the pulsation value of the non-coaxial double-output pulsating mechanism. The over-constraint analysis and self-tuning structure design of the non-coaxial double-output pulsation generating mechanism are completed by using the "zero-crossing constraint self-tuning basic group" method. The simulation results show that the parallelism error exists in the input and output axes of the system. The effect of output angular velocity can be neglected and the expected effect is achieved.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH112
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