关于整体式油箱盖涂装限位辅具的开发及应用

对于整体式式油箱盖结构,油箱盖处于常开状态。白车身入涂经过自动机喷涂段,机器人旋杯会与油箱盖外板发生碰撞,导致车辆无法正常通过。文章以奇瑞某款SUV车型为基础,介绍一款新开发的整体式油箱盖限位辅具,结构简单,使用便捷,并满足车间批量使用。     

浅谈先张法钢绞线整体放张的几种常用方法

简单介绍了先张法预应力钢绞线整体放张的几种方法，并分别阐述了其优、缺点。     

大风浪中船舶航行安全性评价

从船舶在波浪中运动的机理出发，将模糊数学中的层次分析法理论用到大风浪中船舶航行安全性评估上来，开发了相应的计算程序。寻找到了船舶在波浪中航行时的安全航态范围和在某一航速(或航向)时的最佳航向(或航速)，形成了一套“理论航法”，使得驾驶员在操纵船舶时能够得到有效的指导。     

涵洞整体式基础分析与设计

主要介绍涵洞整体式基础选择及设计要点,重点分析整体式基础地基承载力的深度修正,并通过计算,对整体式基础的材料选用进行了比较说明。     

整体式桥梁台后土压力的试验研究

通过定期观测整体式桥梁桥台后土压力,研究台后土压力与均匀温差之间的关系,得出在升温和降温温差下台后土压力沿台高的分布和变化规律,并对试验数据进行了数学统计处理,建立了台后土压力系数与上部结构变形和桥台高度之间的数学关系。将该计算方法的计算结果与实测值进行了对比,证明该公式精度较好,且偏安全,可用于工程实践。     

全承载大型客车车身骨架梁单元与壳单元模型有限元计算对比

建立某款全承载大客车车身骨架梁单元、壳单元有限元模型并分析计算,对比模态、扭转静刚度和静强度分析结果并进行了试验验证。从反映整车性能的模态和扭转静刚度分析结果看,两种模型吻合较好,且与试验结果的相对误差小;从反映整车局部性能的静强度分析结果看,两种模型计算结果存在差异,壳单元模型计算结果与试验结果较吻合,梁单元模型计算得到的应力值普遍低于试验结果。     

鱼雷半实物仿真系统的递阶体系结构和多帧速配置方法

本文阐述了鱼雷制导开口系统的发展对一体化仿真的需求情况，在给出制导数学模型的基础上，提出了一种按递阶控制方法构成的仿真体系结构，并讨论多帧速配置中的仿真误差问题。     

Level and attitude control of the active suspension system with integral and derivative action

A 7-DOF full-car model with optimal active control suspension is utilized to evaluate the vehicle dynamic performances which are achieved through proposed controllers. The optimal controller, which includes the integral action for the suspension deflection, considerably improves the attitude control of a vehicle because the rolling and pitching motion in cornering and braking maneuvers are reduced, respectively. In the viewpoint of level control, the integral control acting on the suspension deflection results in the zero steady-state deflection in response to static body forces and ramp road input. The dynamic characteristics of the suspension control system are evaluated in terms of time domain and frequency domain. The simulations in the time domain demonstrate the advantages of the active suspension system obtained by penalizing the integral and derivative of suspension deflections and the derivative of roll and pitch angles in the performance index. The frequency characteristic curves obtained by simulations regarding integral action or derivative action show the increase of both ride comfort and road-holding performances by maximizing the use of suspension deflections. The potential of derivative control is shown by the performances of the car traveling over a bump and braking.     

Designing a sliding mode controller for slip control of antilock brake systems

Antilock brake system (ABS) has been designed to achieve maximum negative acceleration by preventing the wheels from locking. Research shows that the friction between road and tire is a nonlinear function of wheel slip. Therefore, maximum negative acceleration can be achieved by designing a suitable control system for wheel slip regulation at its optimum value. Since there is a lot of nonlinearity and uncertainty (uncertainty in mass and center of gravity of the vehicle and road condition) in vehicle dynamics, a robust control method should be used. In this research, a sliding mode controller for wheel slip control has been designed based on a two-axle vehicle model. Important considered parameters for vehicle dynamic include two separated brake torques for front and rear wheels as well as longitudinal weight transfer caused by the acceleration or deceleration. One of the common problems in sliding mode control is chattering phenomenon. In this paper, primary controller design has been improved using integral switching surface to reduce chattering effects. Simulation results show the success of integral switching surface in elimination of chattering side effects and by high performance of this controller. At the end, the performance of the designed controller has been compared with three of the prevalent papers results to determine the performance of sliding mode control integrated with integral switching surface.     

高填方涵洞整体式基础的地基承载力确定

在高填方涵洞设计时,整体式基础是常用的基础型式,通过太沙基理论公式及桥涵基础规范公式讨论高填方涵洞采用整体式基础条件下的地基承载力确定方法.采用有限元数值模拟计算方法得出地基土应力分布.