连通式油气悬架三轴重型车辆模型非线性动力学分析

建立了基于连通式油气悬架的三轴重型车辆模型,分别将路面不平度考虑为冲击激励、随机激励和正弦激励,分析了连通式油气悬架的非线性特性对三轴重型车辆振动特性的影响,并分析了连通式油气悬架的抗俯仰性能及抗侧倾性能;将路面不平度考虑为正弦激励,以路面不平度激励频率为参数,通过分叉图、波形图、相图以及庞加莱截面分析了正弦激励作用下三轴重型车辆的非线性动力学响应,仿真结果表明系统在不同激励条件下存在周期运动和混沌运动;连通式油气悬架对重型车辆具有较好的抗侧倾和俯仰特性.     

声表面波串联谐振器传感系统构建及初步应用研究

本文探索了一种声表面波串联谐振器传感系统及其初步应用。该传感器的敏感部件由丝网印刷碳电极和一个433MHz声表面波谐振器串联组成。采用真空包装的声表面波谐振器工作在较高的频率下,这有利于提高检测系统的稳定性和灵敏度。我们制备了不同浓度的小鼠肠道内分泌肿瘤细胞STC-1悬液用于检测实验,每种样品取100微升滴在丝网印刷碳电极上,实验记录了每种浓度细胞悬液的传感器响应。实验结果表明该传感器可以检测不同浓度的细胞悬液,并且具有较好的灵敏度。     

基于Adams/Car的汽车前悬架仿真分析及优化设计

针对某车型的麦弗逊前悬架系统,用车辆多体动力学仿真软件Adams/Car建立该悬架的虚拟样机模型,对其进行双轮同向跳动激振仿真分析,并综合评价该悬架的车轮定位参数、主销后倾拖距和转向角随轮跳的响应特性.在仿真分析的基础上,针对不合理的结构设计参数,利用Adams/Insight模块进行基于设计变量灵敏度分析的优化设计.优化后的悬架参数能很好地满足设计要求,从而达到提高该悬架系统整体性能的目的.     

悬置支架强度分析和拓扑优化

在项目研发阶段用Abaqus对某轿车的发动机悬置支架进行强度分析,发现悬置支架不满足强度要求,通过拓扑优化的方法对其结构进行改进,在不增加质量的情况下,使悬置支架达到强度设计目标.     

A study of suspended roofs for near-source seismic motions

The non-linear behavior of multi-suspended roof systems for seismic loads is studied. The study is based on a formulation that can be easily employed for a preliminary design of multi-suspended roofs subjected to seismic loads. Specifically, applying Lagrange’s equations, the corresponding set of equations of motion for discrete models of multiple suspension roofs is obtained and numerical integration of the equations of motion is performed via the Runge–Kutta scheme. For representative realistic combinations of geometric, stiffness and damping parameters, a non-linear analysis is employed to study the behavior of suspended roofs for near-source and far-field seismic motions. The analysis demonstrates that: (i) code-specified design loads could dramatically underestimate the response of suspended roofs subjected to near-source ground motions and (ii) flexible roofing systems are greatly affected by near-source ground motions, a behavior that is not observed for stiff systems.     

基于CAN总线的模态测试悬挂控制系统设计

阐述了模态测试悬挂控制系统的研究意义,分析了模态测试悬挂控制系统的工作原理和硬件结构,制定了适合模态试验悬挂控制系统的CAN通讯协议,设计了底层电磁力与气压控制软件、上/下位机通信软件和上层工控机监控软件;试验结果表明,基于CAN总线的模态测试悬挂控制系统具有控制精度高、工作稳定可靠、通信速度快和可扩展性强等特点,很好地实现了模态测试悬挂控制系统预期的研制指标。     

搅拌槽中固液悬浮及其放大的研究

研究了具有盘管、碟形底和斜叶涡轮固液悬浮搅拌槽的放大规律。试验用槽径（外径）分别为０．２ｍ、０．５ｍ和１．０ｍ的三个有机玻璃搅拌槽。用激光法测定悬浮液浓度。得出离底悬浮及均匀悬浮时搅拌转速和比功率的经验关联式，与测定槽内轴向速度分布所导出的均匀悬浮方程相吻合，并表明槽径的放大指数主要由循环流数所决定。     

探海侯之死

在北京团城的城台上,有几株古松,相传是辽金遗物。清代乾隆皇帝给三棵古树封赐了爵位。十多年前,团城搞修缮,建筑队的某位工人把生石灰堆在名为“探海侯”的松树周围,生石灰化光了,古树死了。     

Chemical structure designing to enhance the yield stress of electrorheological fluids based on modified chitosan compounds

For studying the influences of alkyl chain length, end groups of the side chains, and mixture on enhancing the shear stress of electrorheological (ER) fluids, chitosan carboxylates were synthesized for ER particles and prepared ER fluids by dispersing the particles in silicone oil. After comparing the shear stress of all prepared ER fluids, the conclusion obtained was that ER particles having two functional groups showed higher shear stress than those having one functional group. However, after mixing two ER particles having one functional group respectively, the ER fluid having those particles showed a lower shear stress. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1559–1566, 2004     

现代农药剂型新进展

简要介绍了国内外现代农药剂型的研究进展,对悬浮剂、缓释剂、微乳剂、片剂、水分散粒剂等剂型的发展动态进行了概述。重点论述了悬浮剂中的非水悬浮剂、农药包衣化和农药吸附化以及片剂中的泡腾片剂、熏蒸片剂和烟雾片剂。