| 1. | By means of the drillstring ' s finite element model and the numerical solution method , and based on the mechanical models of bit / rock interaction , the dynamic models for torsional vibration of cone bits and drillstrings are established
利用钻柱动力学有限元模型的数值计算方法，在考虑了钻头与岩石互作用力学模型的基础上，建立了钻头和钻柱扭转振动动力学仿真模型。 |
| 2. | Using theory of strength of track structure and vehicle - track coupling vibration dynamic model , we analyze the effects the different thickness of ballast act on relevant track structure parts and deduce the rational thickness of ballast
本文应用轨道结构强度计算理论及车辆轨道耦合振动动力学仿真计算模型，分析了不同道床厚度对相关轨道结构部件的影响，得出了合理道床厚度的建议值。 |
| 3. | In accordance with dynamic characteristics of swing movable teeth drive , the torsional vibration dynamic model of swing movable teeth drive is developed and the vibration equation of the vibration system is established for the first time
针对摆动活齿传动机构的动力学特点，首次建立了摆动活齿传动系统的扭转振动动力学模型，导出了系统扭转振动的动力学方程，并对系统动力学响应进行了求解。 |
| 4. | Abstract : based on the bouncing dynamic model & amp; vibration equation established in paper we analyse the damping ratio of vehicle suspension . we discass the stabilation of vibration system when the equivalent damping of shock absorber is zero or negative . we also provide the technology order which makes the system stable and un - corservative
文摘:该文在建立振动动力学模型和运动方程的基础上，通过对车辆悬架阻尼比分析，就减振器阻尼等效为零或为负时，对振动系统稳定性影响及产生原因进行了探讨.提出设计和制造过程中有效控制系统稳定和非保守特性的技术路线 |
| 5. | In the present dissertation , friction - induced noises emitted by a flat specimen rubbing against another flat specimen or a ball specimen under reciprocating sliding are studied . the detailed observation of the scars is conducted by means of a scanning electrical microscope ( sem ) , laser scanning microscope ( lsm ) , optical microscope and profilometer . the dynamic state variables are analyzed in detail using the discrete wavelet transform
使用电子扫描显微镜( sem ) 、激光扫描显微镜( lsm ) 、光学显微镜和表面轮廓测量仪等设备对摩擦噪声发生的区域进行了详细的观察和分析，运用小波变换技术对摩擦噪声状态下的动力学变量进行了深层次的研究，应用matlab simulink语言对摩擦系统进行了振动动力学仿真，系统地研究了摩擦噪声的形成机理。 |
| 6. | Based on the bouncing dynamic model & vibration equation established in paper we analyse the damping ratio of vehicle suspension . we discass the stabilation of vibration system when the equivalent damping of shock absorber is zero or negative . we also provide the technology order which makes the system stable and un - corservative
该文在建立振动动力学模型和运动方程的基础上，通过对车辆悬架阻尼比分析，就减振器阻尼等效为零或为负时，对振动系统稳定性影响及产生原因进行了探讨.提出设计和制造过程中有效控制系统稳定和非保守特性的技术路线 |
| 7. | By applying hybrid coordinates method , dynamic equations of motion for a satellite system which includes central rigid body , momentum wheels , rigid rotational components and flexible solar arrays are given . together rotational dynamic equations for flexible solar arrays and rigid rotational components are presented
采用混合坐标法,建立了包含中心刚体、动量轮、刚性转动部件、挠性帆板的卫星系统的动力学方程、帆板转动动力学方程、帆板挠性振动动力学方程和活动部件转动动力学方程。 |
