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In this paper, a dynamic photoelastic method is applied to investigating the stress wave propagation of projectile ogive under impact load, the dynamic stress state is analyzed, and the dynamic stress values are obtained by applying stress optics law.

用动光弹实验方法研究了冲击荷载作用下穿甲弹风帽模型的应力波的传播过程，对其受冲击后的动应力状态进行了分析，用应力光学定律得到了模型内的动应力值。

Based on water-entry dynamic and water-entry ballistic theories, the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena, and an oblique water-entry impact model coupled with ballistic and dynamic models are established. According to the exact geometric shape of the wetted body surface, the dynamic model is established.

以冲击体入水动力学和入水弹道学理论为基础，针对平头尖拱体入水冲击这个复杂物理现象，引入体现液面隆起现象的沾湿因子，用等效液面代替自由水平液面，建立了斜入水高速冲击的运动学和动力学冲击模型，其中动力学模型是根据平头尖拱体沾湿面的具体几何形状而建立。

The new method is given to design the optimum profile modification curve design The effects of optimum profile gear in improving the dynamic performance of gear transmission are verified in the Gear Dynamic Performance Test Rig In this dissertation, the main study contents and creative results are shown as following: The influences on the gear transmission system caused by the gear's accumulated error (periodic error and harmonic error) are theoretically studied. A new method is developed to simulate the gear's harmonic error by using the 2-order MARKOV process A simulated model of the dynamic performance which is excited by the gear's accumulated error is obtained.

本文在前人大量研究的基础上，结合作者承担的国家自然科学基金项目"齿轮传动动态系统辨识与三维修形研究"和山东省自然科学基金项目"齿轮传动动态性能仿真及结构参数、齿形的优化修形"，采用理论和试验相结合的新思路，系统地研究了齿轮传动的动态性能，建立了能正确描述齿轮传动系统动态性能的仿真模型和系统辨识模型，给出了确定齿轮传动轮齿修形曲线的优化设计方法，利用自行研制的齿轮传动动态性能试验装置，验证了优化修形齿轮对提高齿轮传动动态性能的突出作用。

The observation shows that the tendency of dynamic modulus under coupling test with the effect of rotation of principal stress axes was similar with dynamic modulus under conventional dynamic test.

探讨了主应力轴连续旋转下，空心试样在微幅应变下的动力特性研究。

The apparatus for static and dynamic universal triaxial and torsional shear soil testing is employed to perform stress-controlled cyclic coupled vertical and torsional shear test by different cyclic stress paths. Through a series of tests on saturated clay, the dynamic deformation, stress-strain relationship and dynamic strength are systematically investigated under rotation of principal stress axes.

针对饱和黏土，利用土工静力－动力液压三轴－扭转多功能扭剪仪进行了均等固结下的耦合循环剪切试验，着重研究了不同循环应力路径对应力－应变关系和强度特性的影响。

The problem of contact, which is one of the most complex problems in the dynamic simulation, is discussed in order to establish the dynamic model of the isolator in the environment of ADAMS(the edition of 2003),which is the most widely used simulation software of dynamic systems in the world.

同时，文中的模糊半主动控制策略能够在较小的控制力需求下对隔震层相对位移、各层绝对加速度均有较好的控制效果，证明了该控制方法的有效性。

The research method is used, which combines the turbocharged engine dynamic performance simulation with the steady test. A quasi linear dynamic simulation model for turbocharged diesel engine is established. Neural network based emission model is established using the steady test data. A prediction simulation model of turbocharged engine dynamic emission is proposed based on MATLAB/SIMULINK.

采用了增压发动机动态性能模拟与稳态试验相结合的方法，建立了涡轮增压柴油机的准线性动态模型，利用稳态试验数据建立神经网络排放模型，提出了一种将2种模型结合起来在MATLAB/SIMULINK环境下的增压发动机动态排放预测仿真模型。

Through analyzing the structure of dynamic data, a new algorithm is presented for separating dynamic random error from dynamic data.

通过分析动态数据的组成结构，针对动态数据中的随机性成分项，提出一种分离动态随机误差的新算法。

In this paper, the author sets up the dynamic model of the vibratory extracting-driving piling machine, and carries out the dynamic analysis, parameter calculation and Matlab's simulation for this model. Using the equation reciprocity law to carry out the calculation of soil parameter and simulation, and using the genetic algorithm to make optimization of the machine on the basis of the simulation, the author gets the optimum self-induced vibration frequencies of the machine changing with the depth of the pile and the optimization result of other parameters, thus reaching the conclusion that along with the increase of pile sinking depth, the optimum self-induced vibration frequency becomes bigger, and the vibration mass becomes smaller, hence deepening the knowledge of the dynamic performance of this system.

本文建立了振动沉拔桩机的动力学模型并对这一模型进行了动力学分析、参数计算和Matlab仿真，并利用方程对等法进行土壤参数的计算和仿真，又在仿真的基础上使用遗传算法对桩机进行了优化，从而得出了路基加固振动沉拔桩机随沉桩深度变化而改变的最佳激振频率以及其它参数的优化结果，并得出了随沉桩深度的增加，桩机的最佳激振频率由小变大，最佳参振质量由大变小的结论，深化了对该系统动力学性能规律的认识。

In this paper, the author sets up the dynamic model of the vibratory extracting-driving piling machine, and carries out the dynamic analysis, parameter calculation and Matlabs simulation for this model. Using the equation reciprocity law to carry out the calculation of soil parameter and simulation, and using the genetic algorithm to make optimization of the machine on the basis of the simulation, the author gets the optimum self-induced vibration frequencies of the machine changing with the depth of the pile and the optimization result of other parameters, thus reaching the conclusion that along with the increase of pile sinking depth, the optimum self-induced vibration frequency becomes bigger, and the vibration mass becomes smaller, hence deepening the knowledge of the dynamic performance of this system.

本文建立了振动沉拔桩机的动力学模型并对这一模型进行了动力学分析、参数计算和Matlab仿真，并利用方程对等法进行土壤参数的计算和仿真，又在仿真的基础上使用遗传算法对桩机进行了优化，从而得出了路基加固振动沉拔桩机随沉桩深度变化而改变的最佳激振频率以及其它参数的优化结果，并得出了随沉桩深度的增加，桩机的最佳激振频率由小变大，最佳参振质量由大变小的结论，深化了对该系统动力学性能规律的认识。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。