| 1. | By means of dual - time stepping method and moving grids technique , we solved the 3 - d unsteady euler ' equations for helicopter rotor in forward flight , and obtained the near - field hsi noise
为了多桨旋翼旋转、变距等复合运动的准确描述，采用了多块分区运动网格技术。 |
| 2. | These phenomena occasionally occur that lifting cylinder does not rise but lower and speed of tilting cylinder exceeds the limit when forklift truck and lifts and tilts forward simultaneously
摘要叉车在进行上升、前倾复合运动时，偶尔会出现不升反降、超速前倾的现象。 |
| 3. | In this paper , we classify the pairs into two kinds - - traditional pairs and new composite pairs . the composite pair ' s coming forth made it easier to invent new type parallel manipulator
本文研究了构成运动支链的简单运动副和复合运动副类型，复合运动副的提出，使得新型并联机构的提出成为可能。 |
| 4. | Secondly , the control of position loop was improved by using compound control with velocity and acceleration feed - forward control and digital notch filter control in feeding servo system
其次对位置环的控制进行了改进，将位置前馈改进为速度前馈和加速度前馈，并在前向通路中增加了一个数字阶式滤波器组成复合运动控制器。 |
| 5. | The simulation and experimental result shown that the compound controller and the fuzzy controller have good steady - state - performance and dynamic - performance , and these control methods are available for ac - servo control system
仿真和实验结果表明，所设计的复合运动控制器和模糊运动控制器具有较好的稳态性能和动态性能，是切实可行的控制方法。 |
| 6. | As shown in the simulating results , the platform when flying with big attitude angles still has high accuracy of attitude control and the measure for linearization not only makes the model simple but also maintains the valid high accuracy
仿真结果表明，大姿态复合运动的平台仍具有较高的姿态控制精度，并验证了将二阶小量忽略的线性处理方法既可以简化模型，又不会影响模型的各项精度。 |
| 7. | Utilizing the characteristics of quick response , easy for automatization and easy to realize frequent commutation of the hydraulic system , this mechanism can be employed in composing the compound movement in horizontal and vertical direction , which could realize accurate simulation of the motion law for motorcycles and automobiles under the effect of random load in high frequency
利用液压系统反应快、便于自动化、易于实现频繁换向的特点，该机构可用来合成水平、垂直方向的复合运动，实现对摩托车、汽车等在高频随机载荷作用下运动规律的精确模拟。 |
| 8. | Abstract : mechanism of optimal cutting movement track for stone sawing machine was analyzed . the system mathematical formula was established , the calculation expressions of system technique parameter and the exact calculation methods of optimal offset data were reduced , and the optimization for complex movement mechanism was realized
文摘:分析研究了锯石机切削石材运动轨迹的机理，推导出了关键技术参数的计算公式和偏心距数据选定的精确计算方法，实现了复合运动机构的优化设计。 |
| 9. | The differential equations of rigid body compound motion in analytical form were derived . the approach to solve dynamics equations one by one and corresponding means to analyze drive force were submitted , which was the basis for further study on kinematics and dynamics of the mechanism
着重论述了反三角函数唯一值的求解方法，推导了解折形式的刚体复合运动微分方程，提出动力学方程组逐次求解的方法和与之配套的驱动力分析方法，为后续的运动学和动力学分析奠定基础。 |
