自由度

Then the structure decomposed into a series of equivalent single degree of freedom system, the random wind-induced response and the equivalent static wind action based on Davenport spectrum of the structure with TLD are obtained. An example confirms this method.

此外，由于建立了将结构分解为一系列等效单自由度体系的一般方法，利用等效单自由度体系与抗震反应谱的关系，本文方法还可用于非经典阻尼非对称被动控制结构基于抗震反应谱的地震作用取值。

With the freedom in adduction and abduction motions of shoulder joint, a two-rigid-body motion system is formed.

将前臂和肱骨的联结简化为转动副，同肩关节的内收-外展自由度一同形成一个2自由度的两刚体系统。

In this paper, the overall design scheme of one assault rifle prototype with double cyclic systems and variable firing rate is illuminated in brief and the related analytical models of one DOF and two DOF by the basic theory of dynamics of multi-rigid-body system is established. The calculating analogue program in VB computer language for analyzing the movement regularities of floating body of the assault rifle prototype with some universal property and function of man-machine conversation is completed. The comparison between the calculating results and the experimental results is conducted also.

本文对某步枪双循环变射频发射原理样机方案进行了简单的说明，应用多刚体系统动力学基本理论建立了原理样枪的一自由度和二自由度动力学分析模型，用VB编写了具有一定通用性和人机对话功能的自动机运动规律分析计算程序，并将计算结果与试验结果进行了比较，验证了数理模型的正确性。

Obtained in 10 poles using the equation development law (to contain 10 poles) the degree of freedom for - 1 each kind of possibility configuration combination; And uses the analysis situs chart law, ties the divisible number collection and the painting law, carries on the degree of freedom is the F=-1 ten poles endogenic force pressurizes the auto-adapted mechanism to allow the movement chain the synthesis.

利用公式推导法得出了10杆以内（含10杆）自由度为－1的各种可能构型组合；并利用拓扑图法，结合数集与画图法，进行自由度为F=-1的十杆内力加压自适应机械装置的容许运动链的综合。

Many simulation tables for projectile angle motion have been developed,but most of the tables are of 1-DOF or 2-DOF and even if the table is of 3-DOF,the load of projectile is low.

国内外已经研制了多种弹箭角运动模拟装置，但大部分是一自由度或者两自由度，即使是三自由度的，其负载也是有限的，或者转速过低。

Chapter four studies the chaotic responses in a system consisting of simple pendulum and harmonic oscillator under bounded noise excitation. Firstly, the Melnikov function of the two-degree-of-freedom system under Hamiltonian perturbation is derived. The essential condition of the autonomous system for the probable onset of chaos is obtained, the Poincare maps of the system under small Hamiltonian perturbation and the effect of increasing perturbation on the Poincare maps are studies. Then for the non-autonomous system under damping and harmonic or bounded noise excitation, the largest Lyapunov exponent and Poincare maps are calculated. From the analysis of the largest Lyapunov exponent, the critical criterion for the onset of chaos, and the conclusion that the threshold of bounded noise amplitude for the onset of chaos in the system increases as the intensity parameter of Wiener process increases are obtained. The result from the analysis of Poincare maps is in agreement with that obtained from the Largest Lyapunov exponent. The effect of varying damping coefficient and intensity parameter of Wiener process is also analyzed.

第四章研究了有界噪声激励下的两自由度单摆—谐振子系统的混沌运动，首先推导了该两自由度系统仅在Hamilton扰动下的Melnikov函数，得到该自治系统可能产生混沌的必要条件；研究了该系统在小的Hamilton扰动和增大摄动情形下的Poincare截面；然后对有阻尼、谐和或有界噪声激励下的非自治系统数值计算了其最大Lyapunov指数和Poincare截面；从Lyapunov指数分析得到了这个两自由度系统产生混沌运动的临界条件及产生混沌的临界激励幅值随Wiener过程强度参数值的增大而增大的结论，Poincare截面分析的结果亦符合Lyapunov指数分析的结论；研究了Wiener过程强度参数、阻尼系数变化对Poincare截面的影响。

While there are the same material properties, shapes and similar boundary conditions, the field distribution of the former can be solved analogically by the later one.

密绕线匝的铁氧体电感器磁场强度H可认为仅有环向分量，若选择H为自由度，则成轴对称场分布；加载环向电流的电感器选择矢量磁位A为自由度时也呈轴对称分布，该文推导了这两类磁场在各自自由度下满足的微分方程。

This article introduces types and characteristics of vehicle's transmission,and analysed its current development,with detailed discussion on the research methods of epicyclical gear transmission at home and abroad,including the design methods of its transmission diagram which has two or three degree-of-freedom,the process of shifting gears which has multiple degree-of-freedom,the denotation method of joint element on the chart of equivalent lever,and the equivalent lever method in which the dynamic and kine...

介绍了车辆变速器的种类、特点与发展概况，对变速器中的机械传动部分，特别是行星齿轮传动的研究状况介绍的较为详细。对国内外关于2自由度、3自由度行星式变速器传动简图的设计方法，多自由度变速器的换档过程，利用等效杠杆法研究行星齿轮传动，等效杠杆图中接合元件的表示方法，利用等效杠杆的运动分析、力分析和运动分析方程，建立行星变速器相应分析的方程的基本情况作了介绍，并分析了各种研究方法的适应范围与优缺点。

Some valuable conclusions were drawn and shown as following: Three models were brought forward, i.e. 6DOF rigid-connected model, 8DOF rigid-jointed model and 12DOF non-rigid connected model. The basic dynamic properties of the system, the relative motion between parafoil and payload, and some geometric parameters'effects on the system dynamics were analyzed and summarized.

分别建立六自由度刚性连接模型、八自由度刚性铰接模型和十二自由度非刚性连接模型，着重分析了系统的基本运动特性、回收物-伞体间的相对运动特性，以及主要设计参数对系统性能的影响；并将不同复杂程度的模型进行对比，分析了各种模型的特点和适用范围。

The theoretical analysis shows the decouple of rotation and levitation. The rotor is actively controlled only in two radial directions and rotation while the other three motions are passively stable owing to the short-span structure.

理论研究表明这种结构的无轴承电机的磁悬浮径向力和电机的转矩是相互解耦的，又因为它是片状永磁转子结构，只须控制转子的两个径向自由度和旋转自由度，其他三个自由度是被动稳定的。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。