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关键词： AMT   静摩擦   叠加锯齿波   自适应PID  

摘要： 商用车工作环境恶劣,分离轴承负载大,离合器片磨损下来的碎屑、以及分离轴承进水、生锈等因素导致分离轴承卡滞,需要克服的静摩擦力比较大,而使用传统的离合器控制算法效果并不好,因此我们采用一种叠加锯齿波自适应PID克服静摩擦的控制算法,即在原有目标位置基础上叠加锯齿波自适应PID位置控制,并通过整车试验对控制算法进行了验证,试验表明所设计的叠加锯齿波自适应PID控制算法使离合器结合位移跟随性较好,起步更加平顺,极大的改善了起步性能。

关键词： 离合器   装配检验   工装   设计  

摘要： 离合器的装配质量对拖拉机的性能起着至关重要的影响,设计了一种可靠便捷的离合器压盘总成装配检验工装,给离合器压盘总成的安装提供了可靠的检测手段。

关键词： 离合器自由轮   铬碳相渗层   失效分析   疲劳剥落   显微孔洞  

摘要： 直升机主减速器用离合器自由轮在使用过程中出现了表面渗层剥落失效问题,本研究采用体式显微镜观察、扫描电镜观察、金相分析、硬度分析、XRD分析等方法,对铬碳相渗层的剥落原因进行了分析。分析结果表明,渗层剥落的机理为接触疲劳剥落,渗层内部存在的显微孔洞在循环载荷的作用下产生的微裂纹扩展,是造成渗层剥落产生的主要原因,随着微裂纹的扩展,表面出现轻微剥落区域,剥落区域的出现造成了邻近区域的应力集中,促进了剥落区域边缘贯穿裂纹的形成,加剧了剥落。同时,渗层的局部剥落,造成的承载区域减小,应力上升,促进了新剥落区域的产生,最终多个剥落区域扩展,形成贯穿性渗层剥落。

关键词： 离合器从动盘   运输车   故障检修   烧损   干燥器   失效   操作不当   车辆  

摘要： 有1辆长期露天停放的EQ1118GA运输车，起动车辆后，因操作不当造成离合器从动盘烧损，车辆无法正常行驶。

关键词： Light electric vehicle   Two-speed transmission   Torque interruption   Controllable overrunning clutch   Camshaft clutch actuator   MANUAL TRANSMISSION   SHIFTING CONTROL   SIMULATION   SYSTEM  

摘要： A novel two-speed inverse automated manual transmission (I-AMT) with overrunning clutch for electric vehicle (EV) is proposed in this paper. The structure of I-AMT is simplified because the synchroniser and shift fork are removed. During gear shifting, the overrunning clutch does not need to be controlled by an extra actuator due to its kinematic characteristics. Thus, the control issue involves only the inverse friction clutch. The control effect is further enhanced with a novel clutch actuator using worm gear and camshaft. The model of I-AMT with overrunning clutch is built in commercial software AMESim, and simulations are carried out to validate its performance. Lastly, the proposed I-AMT is manufactured and applied on a light EV. Results show that using overrunning clutch, the gear shifting can be completed in a short time without torque interruption or large oscillation. Furthermore, the proposed mechanism can avoid backward sliding during vehicle gears shifting on the slope. Compared with single-speed transmission, those with the proposed I-AMT perform better in energy saving and gradeability, especially in mountain areas. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Flux-intensifying   operating speed range   inductance characteristics   mechanical strength   OPTIMIZATION   OPERATION   ROBUST  

摘要： In this paper, two new flux-intensifying interior permanent magnet (FI-IPM) motors owing the characteristic of L-d > L-q are proposed for extended operating speed range. The feasible approaches of realizing L-d > L-q are first discussed to emphasize rotor flux barrier design. According to the feasible approaches, interior flux barriers and surface flux barriers combined with different PM placements are adopted in these two motors. To verify the proposed approaches and the validity of motors, a comprehensive investigation and comparison between the two motors are carried out, including both electromagnetic performances and mechanical performances. By comparison, a prototype motor possessing lower torque ripple, lower magnetic saturation, wider speed range, and more robust mechanical property is manufactured and tested. The experiment results verify the characteristics of the proposed motors and the validity of the proposed approaches in FI-IPM motor design.

关键词： TYROSINE PHOSPHORYLATION   DYNAMIC MICROTUBULES   GLIOBLASTOMA CELLS   FORCE TRANSMISSION   MANUAL VALIDATION   MASS-SPECTROMETRY   TRACTION   MOTILITY   GROWTH   CONTRACTILITY  

摘要： Microtubule-targeting agents (MTAs) are widely used chemotherapy drugs capable of disrupting microtubule-dependent cellular functions, such as division and migration. We show that two clinically approved MTAs, paclitaxel and vinblastine, each suppress stiffness-sensitive migration and polarization characteristic of human glioma cells on compliant hydrogels. MTAs influence microtubule dynamics and cell traction forces by nearly opposite mechanisms, the latter of which can be explained by a combination of changes in myosin motor and adhesion clutch number. Our results support a microtubule-dependent signaling-based model for controlling traction forces through a motor-clutch mechanism, rather than microtubules directly relieving tension within F-actin and adhesions. Computational simulations of cell migration suggest that increasing protrusion number also impairs stiffness-sensitive migration, consistent with experimental MTA effects. These results provide a theoretical basis for the role of microtubules and mechanisms of MTAs in controlling cell migration.