| 1. | The exercise period was similar to the previous study .
运动周期类似前面的研究。 |
| 2. | Then the analysis of dynamic statics about mould - cut main mechanism is given and the analysis about force of each joint point in a motion period is put forward
然后对主切机构进行了动态静力学分析，得出一个运动周期中各铰接点的受力情况。 |
| 3. | Abstract : the phase photograph of a simple pendulum is discussed . two methods of calculating the nonlinear pendulum period is given with the phase orbital properties and the action variation
文摘:对单摆运动相图作了必要的讨论，赋予相图以直观的几何意义，并由单摆相点运动特性以及引入单摆系统作用变量两种方法求出了单摆系统的运动周期 |
| 4. | The main content is in the following . a kinematics model is developed for mould - cut main mechanism of trade - mark moulding - machine and the displacement , velocity , acceleration and the corresponding curves of each joint point in a motion period are obtained
主要内容如下：对商标模切机主切机构进行了运动学建模，得出了机构在一个运动周期中各铰接点的位置、速度、加速度等运动参数及曲线。 |
| 5. | The main work includes : the kinematic properties of a planner 4 - bar linkage are researched deeply using the assur group theory . the displacement , velocity and acceleration of each joint point in a motion period are put forward and their curves of the relevant points are plotted
通过运动学分析，得出平面连杆机构在一个运动周期中各铰接点的位置、速度和加速度以及各杆件的角速度、角加速度等运动学参数，并绘制出相应的变化曲线。 |
| 6. | Based on the theory of mechanical optimization and finite element analysis , elbow - bar mechanism of the mp1040b moulding machines made by beiren group is investigated in the dissertation . firstly , a kinematic model representing the bar mechanism is built and the nonlinear system of equations is solved through the method of gradient . meanwhile , the angular displacement , angular velocity , angular acceleration and the corresponding curves of each component in a motion period are obtained
本文以北京人民机器厂mp1040b型模切机肘杆机构为研究对象，以机械最优化理论和有限元技术为基础，首先对模切机肘杆机构建立数学模型，通过梯度法求解此非线性方程组,并得出机构在一个运动周期中各构件的角位移、角速度、加速度等运动参数及曲线。 |
| 7. | The basic relationship between real economy and fictitious economy is that real economy is the basis of fictitious economy and fictitious economy in turn exerts great effects on real economy . the real economy decides the sport period of fictitious economy totally ; fictitious economy is independent , and has its own law
虚拟经济与实体经济的基本关系是：实体经济是虚拟经济的基础，实体经济的运动周期在总体上决定着虚拟经济的运动周期；虚拟经济本身具有独立性，具有自身特殊的运动规律。 |
| 8. | With different clearance value , displacement curves and velocity curves of generalized coordinates as well as slider displacement error curves in a motion period are obtained . these curves are discussed . results show that if manufacturing cost is kept invariableness , in order to improve precision of mould - cuting , fitting precision of joint connecting the crank and coupler has priority to be considered to increase
采用四阶rong - kuta法求解连续接触模型的动力学方程，得到了一个运动周期内运动副间隙取不同值时，各广义坐标的位移、速度曲线和滑块位移误差曲线，并通过曲线分析，得出了要提高模切机主切机构精度，在相同加工成本条件下，应优先考虑提高曲柄与连杆铰接处的配合精度的结论。 |
| 9. | The mechanism is divided into finite elements and researched by ked method . then kinematic differential equations are established for each element and the general kinematic differential equations are built through assembling all the elements . a closed numerical method based on the mode superposition principle is employed to solve the equations
将四连杆机构划分为多个有限单元，建立其单元运动微分方程和系统运动微分方程，运用实振型叠加法的闭式算法求出机构在一个运动周期中各个广义坐标方向的弹性位移，同时求出机构不同位置时各构件上动应力分布情况、机构前四阶振型变化情况。 |
