Air torque position damper hysteresis

The purpose of this paper is to determine the effect of the air torque position (ATP) damper hysteresis on the accuracy of air velocity measurements and the adequacy of the ATP damper mathematical model tested in the present study. A total of three dampers with non-cascading blades were examined: a damper with a single flat blade, a damper with two opposed flat blades, and a damper with two flat blades - one of which is a measuring blade and the other is fixed in the horizontal direction. Furthermore, a total of two damper installation locations in a duct system were examined as well: at the duct exit with a straight duct section preceding the damper and within the duct itself with straight duct sections both preceding and following the damper. The ATP damper hysteresis was found to exert a significant effect on the accuracy of air velocity measurements and the adequacy of the ATP damper mathematical model tested if the ATP damper is more open, i.e. with lower blade angles of attack. Moreover, the ATP damper installed at the duct exit was found to be more susceptible to hysteresis effects than the damper located within the duct.     

橡胶减摆器的环境适应性研究

采用电液伺服试验机进行了橡胶减摆器高低温动态特性测试,研究了橡胶减摆器在不同温度环境下动态特性的变化规律,为其在高寒和热带地区的应用提供依据;同时对其湿热、霉菌和盐雾环境适应性进行了测试,为其在潮湿和海洋环境中的应用提供了依据。研究结果表明,当温度在-55~20℃之间时,橡胶减摆器的低温动态刚度与室温下的比值在1~1.7之间;当温度在20~70℃之间时,橡胶减摆器的高温动态刚度与室温下的比值在0.86~1之间;橡胶减摆器具有较好的高低温动态性能;湿热、霉菌和盐雾试验结果表明,橡胶减摆器的环境适应性优良。     

两结构高效阻尼控制体系非线性地震反应分析

本文对两结构高效阻尼控制体系的地震反应进行了仿真计算和控制参数分析。结果表明,控制参数对结构的地震响应有很大影响,通过合理设计,高效阻尼控制装置能充分利用体系中子结构之间的相互作用,高效地发挥履历型阻尼装置的耗能能力,取得明显的减震控制效果。     

地震作用下多层砖混结构TMD控制及其应用研究

在结构地震反应时程分析基础上,对地震作用下多层砖混结构TMD控制优化设计方法进行了初步探讨;给出了地震作用下多层砖混结构TMD控制优化设计步骤。并用算例验证了该设计方法用于地震反应控制的可行性。     

Experimental evaluation of the seismic performance of steel MRFs with compressed elastomer dampers using large-scale real-time hybrid simulation

Real-time hybrid simulation combines experimental testing and numerical simulation, and thus is a viable experimental technique for evaluating the effectiveness of supplemental damping devices for seismic hazard mitigation. This paper presents an experimental program based on the use of the real-time hybrid simulation method to verify the performance-based seismic design of a two story, four-bay steel moment resisting frame (MRF) equipped with compressed elastomer dampers. The laboratory specimens, referred to as experimental substructures, are two individual compressed elastomer dampers with the remainder of the building modeled as an analytical substructure. The proposed experimental technique enables an ensemble of ground motions to be applied to the building, resulting in various levels of damage, without the need to repair the experimental substructures, since the damage will be within the analytical substructure. Statistical experimental response results incorporating the ground motion variability show that a steel MRF with compressed elastomer dampers can be designed to perform better than conventional steel special moment resisting frames (SMRFs), even when the MRF with dampers is significantly lighter in weight than the conventional MRF.     

汽车磁流变半主动悬架控制策略对比研究

在分析磁流变减振器的结构与原理的基础上,建立起较为简化的汽车磁流变减振器数学模型。同时,建立了1/4汽车半主动悬架系统动力学模型及路面谱模型;分别设计了基于磁流变半主动悬架系统的天棚控制器、地棚控制器、PID控制器及模糊控制器,并利用Matlab/Simulink软件进行了仿真试验对比研究。在天棚控制策略下,车身加速度降低16.32%,悬架动挠度降低16.91%;在地棚控制下,车身加速度降低11.29%,悬架动挠度降低2.94%;在PID控制下,车身加速度降低79%,悬架动挠度反而上升73%;在模糊控制下,车身加速度降低21%,悬架动挠度降低12%,轮胎动载荷降低5%。结果表明,模糊控制磁流变半主动悬架有效减小了车身加速度、悬架动挠度、轮胎动载荷,明显地提高了汽车乘坐舒适性和操纵稳定性。     

抗蛇行减振器功率特性研究

为了研究活塞运行速度、温度、低(常)温持续动作减振器温升对抗蛇行减振器的功率及动态特性的影响,对国内现役抗蛇行减振器进行试验分析。试验结果表明:低温时(低于-10℃),抗蛇行减振器功率随温度的变化较大,高温时,抗蛇行减振器功率随温度的变化不大;减振器活塞低速运行时,温度变化对动态阻尼影响较大;减振器活塞高速运行时,温度变化对相位角影响较大;减振器持续温升对低温时的减振器性能影响较大,温升对常温时的减振器性能影响不显著。     

丙烷塔空冷器集合管管道阻尼减振技术研究

针对济南某炼油厂丙烷塔空冷器集合管管道振动问题,通过现场测量管道系统的振幅和频率,运用有限元分析软件对管系进行模态分析,并与实测数据进行对比,提出了管系振动的解决方案。在不停机的情况下,在管道的适当位置安装阻尼器,有效降低了管道系统的振幅,提高了管道的运行寿命。     

汽车空调风门耐久试验装置设计

设计一种用于空调风门耐久试验的装置,该装置使用STM32F103RCT6微控制器作为系统控制核心,包含ACS712电流传感器采集电路及全桥驱动电路模块RZ7899。采集电路采集与风门执行电机相连的实时电流,输出电压确定风门的位置情况,反馈控制系统,由驱动电路模块实现风门任意位置的启停,避免耐久试验过程中因风门故障被卡住,电流突然增加而损坏电机的危险;采用电驱RZ7899,基于H桥控制原理,实现电机正反转的功能。     

旁置孔隙阀式磁流变阻尼器阻尼力解析解

基于Bingham模型推导了磁流变液流经孔隙阀时流体的运动方程，孔隙阀式磁流变阻尼器阻尼力与阻尼器的结构参数、磁流变液的性能参数的关系为四次代数方程，应用代数方程理论得到了阻尼力的解析解，分析了磁流变液的黏度、屈服强度、磁流变阻尼器结构参数对阻尼性能的影响，本文的研究可用于指导阻尼器设计。