电力隧道施工对既有地铁区间结构的影响与分析

就某电力隧道临近既有地铁区间施工为实例,对其施工过程进行模拟计算,根据计算结果,分析地铁结构变形情况、内力变化、变形缝沉降等,分析评估其对既有地铁结构的影响,并对施工工法提出一定的建议,以保证地铁结构的安全可靠,为类似工程提供参考。     

Research on vane end face of cam-rotor vane servo motor based on disturbing torque

Cam-rotor vane motor (CRVM) is one of the new continuous hydraulic servo motors with the characteristics of no pulsation of instantaneous flow rate and output torque, small volume and rotating inertia. It is one of the appropriate actuators for hydraulic servo system which has good dynamic and steady-state performance requirements. The ideal output torque of CRVM is pulseless, but the actual output torque of CRVM is pulsating. This is caused by the disturbing torque of contact components, especially the friction between vane and cam-rotor. In order to get better performance of CRVM, which means more stable output torque and smaller disturbing torque, we discuss four kinds of vane end faces (VEFs). Analytic formulae of the normal contact force and the disturbing torque caused by the vane are derived from systematical force analysis. The normal contact force and the disturbing torque vary through a period under different VEF, and the reduced oil pressure is simulated in this paper. The simulation shows that the VEF with the proper round and reduced oil pressure can significantly decrease the disturbing torque and get better servo performance. The experiment results verify the correctness of the theoretical analysis and simulation.     

The Hydraulic Control Using Lab VIEW for a Synthetic Rubber Spring Testing Machine

IntroductionThe synthetic rubber test machine is to testthe rubber spring of the subway wagon. The prac-tical use of this machine is to make a preventingmaintenance so we can know with accuracy thespending life of the rubber spring. Every rubberspring is a subject of a cycle or working hours, af-ter this period the testing of this spring rubbermust do it according to specification of the manu-facturer, the testing machine is designed to test 4kinds of rubber springs; the one that is used forth…     

橡胶弹性元件综合试验台的研制

介绍了橡胶弹性元件综合试验台的结构组成,液压系统以及测控系统软件、硬件的设计方案与功能。该试验台可用于各种橡胶弹性元件的性能研究以及型式试验,并可为国产化橡胶元件提供试验参数。     

橡胶弹性元件的试验及数据分析

提出了几种在开发橡胶弹性元件过程中必需进行的试验项目,同时对试验方法以及相关数据的分析与处理进行了探讨。并以目前在轨道交通车辆中应用日益广泛的V字型弹簧以及层叠弹簧为例做了详细的分析。     

施工企业管理信息化建设与管理创新

管理信息化建设是施工企业进行管理创新的有效途径，也是企业改革和发展的重要内容。此就施工企业管理信息化建设对管理创新的意义、途径和需要注意的问题谈谈自己的看法。     

六自由度汽车运动模拟器机构的位置姿态误差分析

六自由度汽车运动模拟器是可进行汽车驾驶逼真模拟的训练和研究用设备。本文利用微分平移和微分放置变换方法，通过误差传递矩阵的求解来探讨模拟器运动台主要误差源与运动台位置姿态误差之间的关系，建立了六自由度模拟器运动台的位置姿态误差模型。     

复合式土工布在河道防护工程中的应用

1 工程概况 深圳河治理一期工程,主要是对原河道裁弯取直及拓宽加深,其中,加深段需将原河床下降3m左右,这样,在加深段和未加深段之间就形成约3m的落差.根据珠江水利委员会的水工试验,这3m的落差将造成对上游未加深段的剧烈冲刷.