Abstract
近年来，随着人们生活水平的提高，对汽车乘坐舒适性的要求也越来越高。汽车行驶的平顺性和操纵的稳定性已经逐渐成为其在现代市场竞争中夺取优势的一项非常重要的性能指标。本文首先通过建立汽车悬架系统的七自由度整体模型图，运用结构动力学和振动知识推导出系统在正弦激励下的拉格朗日方程，并简化为振动微分方程形式，通过MATLAB编制优化程序，求出系统的复特征值和在特定参数下的响应变化图形。然后，简述现代汽车悬架系统的各种控制方法，模拟仿真出系统在不同的刚度和阻尼下输出响应的图形，通过比较分析，为半主动悬架系统的减振器的阻尼和弹性元件的刚度控制提供根据。最后，得出本文的结论。即，汽车悬架的动力响应和控制分析与刚度和阻尼的变化之间的紧密联系。
In recent years, with the improvement of people's living standard, it is higher and higher to take the requirement for comfortableness to the car. Whom car go getting smooth-going and stability that handle become their capture one important performance index very of advantage among modern market competition gradually already. This text, through setting up whole model picture of degree of freedom seven that the car hung a system at first, use structural dynamics and vibration knowledge to derive the system out to encourage Lagrangian equation under in the sine, simplify it for the vibration differential equation form, work out the procedure of optimizing through MATLAB, ask out systematic replying characteristic value and response under the particular parameter and changing the figure. Then sketch Hyundai Motor hang sets of various of system control method, simulation emulation produce system output the figure responded under different rigidity and damping, comparative analysis,to half voluntarily hang sets of damping and rigidity of components elastic of shock absorbers of system control offer according to. Finally, draw the conclusion herein. I.e., the car power of hanging the shelf responds and controls the close connection between analysis and change of rigidity and damping.
关键词：汽车悬架；响应；控制分析
Keyword: The car hangs the shelf; Response; Control and analyze
In recent years, with the improvement of people's living standards, the requirements of the car ride comfort is also getting higher and higher. Car travelling on the ride and handling stability has gradually become in the modern market competition to win a very important advantage of the performance indicators. In this paper, through the establishment of the seven car suspension system as a whole model of freedom, the use of structural dynamics and vibration knowledge derived sine incentive system in the Lagrange equation, and to simplify the form of differential equations for the vibration through the optimization of procedures for the preparation of MATLAB , Calculated the value of complex features and specific parameters in response to changes in the graphic. Then, briefly Hyundai Motor suspension system of control, simulation system in a different stiffness and damping of the graphics output response, through a comparative analysis of semi-active suspension system for the shock absorber damping and flexibility components Under the control of the stiffness. Finally, come to this conclusion. That is, vehicle suspension and control the dynamic response analysis and stiffness and damping of the close link between changes.
毕业论文中文摘要翻译成英文摘要，急！！！~
Along with the electronic commerce and the network marketing's rapid development, the development of 团购网 stood more and more is also a raging fire. The United States 团购网 stood Groupon great success, pull a worldwide 43,200 model of entrepreneurship. Today, our domestic 团购网 stand has as many as 1,000, and still growing. 43,200 as e-commerce, network marketing fusion product, has become the very hot hot. However, in 团购网 stood a large presence there was also a lot of the 团购网 stood close information, individual 团购网 stand appeared by customer complaints phenomenon. 团购网 in the rapidly developing process, also gradually appeared some common problems. Based on the analysis on the current sold-out network as an example, 团购网 stood in the problem in the process of development and received restraints.
This paper firstly introduces the basic concept of e-commerce, the main characteristics and the future development tendency, then this new concept of jan.7 to focus, this paper expounds the development of jan.7 situation and development prospect, and 团购网 standing operating mode. Begin from customer orientation, financing status, profit model and project management aspects of the development of the sold-out nets, and points out that the paper analyses the present situation of the future development of current sold-out nets by sold-out nets cannot effectively, expanding business area scale, jan.7 sold-out nets in individual project doesn't can also good services to consumers and businesses, packed in design 43,200 project net, lack of innovation and the current 43,200 the good faith to the sold-out nets from several aspects such as the development constraints of adverse. These problems sold-out nets further development, in order to further sold-out nets become 43,200 industry leading enterprise, must want to solve these problems.
Keywords: sold-out nets; 43,200; E-commerce; Restricting factors;
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