设计了一套复合曲柄滑块结构,以大曲柄连杆机构产生的往复直线运动频率为基波,以小曲柄连杆机构变频产生的往复直线运动频率为二次谐波,即可叠加产生同时包含位移、速度、加速度的运动信号,从而实现对位移、速度、加速度同时进行多参数校准。从运动学和动力学分析的角度研究曲柄和连杆,连杆和滑块的相对运动即位移、速度和加速度随着时间的变化规律,曲柄连杆机构惯性力及滑块作用力规律,建立了运动装置曲柄连杆机构动力学和运动学模型,通过曲柄连杆机构运动受力理论分析系统运动规律,从动力学角度分析曲柄连杆机构的运动和质量分布,计算了往复惯性力和旋转惯性力,实际测试结果表明速度、加速度的测量误差小于1%。

A double slider-crank mechanism was developed to calibrate the motorial parameters testing equipment. The signal of reciprocating linear motion from one slider-crank mechanism developed was taken as the fundamental frequency,and the signal of reciprocating linear motion from other slider-crank mechanism developed was taken as the second harmonic frequency.The two signals were superimposed to produce displacement,velocity and acceleration signals,so as to realize the simultaneous calibration of displacement,velocity,acceleration and multiple parameters.The relative motions between crank and connecting rod as well as between connecting rod and slider,i.e.,the variations with time of the relative displacements,velocities and accelerations were studied from the view point of kinematics and dynamics.The inertia forces in the mechanism and the forces acted by sliders were investigated.Then a dynamics and kinematics model of the double slider-crank mechanism was set up.Its motion and mass dis

在对发动机曲柄连杆机构运动学分析的基础上,利用Pro/E软件建立了发动机曲柄连杆机构的虚拟样机模型,并进行运动学仿真分析,得到活塞的速度、加速度曲线;利用有限元分析软件Algor对曲柄连杆机构关键构件——曲轴进行有限元分析,得到应力、应变和疲劳寿命云图,为发动机曲柄连杆机构的优化设计提供了参考依据.

On the basis of kinematics analysis of engine crank-connecting rod mechanism,a virtual prototyping model of engine crank-connecting rod mechanism is established and the kinematics a-nalysis is discussed in detail by using 3D design software of Pro/E.By the simulation,the move-ment disciplines of piston including velocity and acceleration are obtained.The finite element anal-ysis of crankshaft is carried out by the software of Algor,and the stress,the distortion and the fa-tigue life for crankshaft are analysed.The analysis results provide the reference for the optimiza-tion design of engine crank-connecting rod mechanism.

采用Pro/E软件建立毒饵喷撒机的曲柄摇杆机构的三维模型,对曲柄摇杆机构进行运动学仿真分析,从而得出了曲柄摇杆机构的运动学特性,为其从动件单行程的速度、加速度的优化提供了理论基础。此外,还研究了在给定机架尺寸和曲柄定角速度的情况下曲柄摇杆机构的运动学特性,实现了摇杆速度、角加速度在两极限位置尽可能一样,同时也实现了速度呈余弦曲线变化,从而避免在喷撒毒饵过程中毒饵数量过于集中在某些位置的情况,并为毒饵喷撒机的后续研究提供了理论支持。

Establish the virtual model of the crank rocker mechanism in the poison bait spray machine using Pro /E soft-ware , make the motion simulation analysis of the crank rocker mechanism , discuss the kinematics characteristics of the crank rocker organization , its velocity and acceleration of follower in the single stroke are optimized , in a given frame size and angular velocity of the crank , it get the tuning parameters that the curve of rocker speed is cosine and angular accel-eration is the same in two limit position , to avoid the spray poison bait most in an extreme position , provide theoretical basis for the research for subsequent bait sprinkling machine research .

为提高果园的采收作业效率,该文提出了一种振幅可连续调节的单向拽振式林果采收机构。该机构主要由输出直线往复振动激励的曲柄摇杆滑块机构和实现振幅调节功能的曲柄滑块机构组成。该文对振摇机构建立了运动学模型,推导得到机构行程与调幅量方程。在满足振摇幅度及调幅量要求的前提下,采用遗传算法对变幅振摇机构进行尺寸优化。根据优化结果建立了变幅振摇机构的三维模型,在ADAMS软件中对调幅曲柄和振摇曲柄同时转动时的振摇机构动力学特性进行仿真分析。在上述理论分析的基础上完成样机加工并开展8 a树龄矮化山核桃田间采收试验,结果表明当调幅曲柄转速为7 r/min,振摇曲柄转动频率在5~14 Hz范围内连续变化时,振幅可调的单向拽振式林果采收机构能够实现山核桃的采收,平均采收率为63.9%。

The fruit harvester is one of the most common machines in orchards. However, current mechanical harvesters are not suitable for orchard harvesting due to fixed operating parameters, especially the frequency and amplitude. Therefore, a monodirectional pulling fruit harvester with adjustable stroke was proposed based on slider-crank mechanism to improve the harvesting efficiency. The harvester consisted mainly of the case, a steel cable, and a front actuator. In particular, the shaking mechanism in the case was composed of one crank-rocker-slider mechanism and one crank-slider mechanism. The former was used to generate linear reciprocating vibration and the latter to adjust stroke. The stroke changed with the angle of the stroke-adjusting crank. Furthermore,a kinematic model of the shaking mechanism was established to describe its stroke and range dynamics. In order to define the influence of linkage length on the stroke and range, a program was developed based on the displacement equati

阐述一种基于曲柄滑块机构的省力钳的设计方法和结构原理,通过分析对比曲柄滑块机构和剪式杠杆机构在手钳应用中的优缺点,对传统手钳进行了革新性优化。

Pliers are widely used in industrial production at present.This paper describes a design method and structure principle of the effort-saving pliers based on the slider crank mechanism.After comparing the strengths and weaknesses between slider crank mechanism and scissor lever mechanism,it optimized the traditional pliers.