汽车稳态圆周行驶初始条件的判定

利用统计拟合方法建立了轮胎侧向附着特性力学模型,并进一步分析了汽车运动和受力的几何关系,求解出了汽车稳态圆周行驶的初始条件,为进行汽车操纵稳定性的仿真研究提供了前提条件。     

智能粮食水分测试仪的研制

给出以AT89C52单片机为核心的粮食水分测试仪的硬件结构组成,并详细介绍了信号处理和测量方法;通过对传感器的标定并进行相应的数据处理。通过实验发现,该仪器使用方便,测量精度高。     

二冲程醇类混合燃料发动机点火提前角调节系统的研究

通过分析点火提前角对发动机性能的影响,得出使用醇类混合燃料的二冲程发动机需要改进点火系统的结论。将现阶段汽车工业在点火系统上采用的微机控制点火技术加以改进后移植到二冲程发动机上,在原点火系统中加装点火控制单元ECU并将其改造成电控点火系统。改进后的点火系统可对点火提前角进行标定,对发动机在不同转速和工况下的点火提前角进行实时调节,找到发动机在该转速和工况下的理想点火提前角。改进后的二冲程汽油机可进一步改善发动机的动力性、经济性以及排放性能。     

聚合物基/稻壳粉复合材料的表面改性研究

使用JC2000A型接触角测量仪测试并研究了蒸馏水和甘油两种液体在稻壳粉填充聚乙烯(PE)、聚丙烯(PP)、聚氯乙烯(PVC)复合材料表面的接触角.研究表明:通过酸碱处理可明显改变接触角及其随时间变化的规律;其中效果最好的是以水作为探测液时,经酸处理后的PE/稻壳粉复合材料.通过方差分析得知表面改性处理方式对接触角有相当显著的影响.     

Coupled Thermo-Elastic Contact Finite Element Method and It''s Application in Gearing

A new finite element method is presented in this paper to analyze the thermo- elastic contact problem with heat input on meshing tooth faces. The computational model of meshing gear has been established and the frictional heat input on meshing tooth faces is estimated. In addition, 2-D finite element analysis program for this kind of problem is listed. The test and practical examples are given to show the validity and versatility of this method.     

AN ANALYSIS OF AXISYMMETRY SHELLS OF SUSPENSION CROSS SECTION BY A METHOD OF INTEGRAL EQUATION IN INITIAL PARAMETER FORM

In this paper,the axisymmetrical shells of suspension crosssection is studied by means of integral equation in initial parameter form.An example of the shells under uniformly distributed load is calculated.     

New Method to Study In-situ Stress of Rock Mass by AE and Structure Analysis of Rock Mass

In this paper, the authors adopt a method of structural analysis and stereography in combination with acoustic emission Kaiser Effect test in laboratory to find out the main direction of initial stresses. For overcoming the shortcomings of Kaiser effect by comparing it with traditional methods of measuring in-situ stresses, it is shown that this method is simpler, more economical and convenient for a large number of measurements and for studying the law of changes of regional in-situ stresses.     

Vehicle Lateral Stability Control Based on Sliding Model Control

In view of the vehicle cornering or path changing under ultimate handling maneuver, a 3-DOF nonlinear vehicle dynamics model which takes the vehicle lateral velocity, yaw rate and body roll angle as the State variables is presented. Based on the dynamic analysis, the method which using additional yaw moment produced by different longitudinal braking force among each wheels to improving vehicle handling stability in emergency situations is discussed. Considering the sideslip angle as one of the vehicle state variables is difficult to measuring, the sideslip angle estimation based on vehicle dynamic model and kinematics is designed. And then, based on the theory of siding model control, the combining sliding model control system is founded, which taking the vehicle yaw rate and body side-slip angle errors between the estimated and the real as the input variables, and taking the braking torque and the steering angle as control aims. The simulation results indicate that the control method can effectively improve the vehicle lateral handling stability.