接触

In allusion to the lower measuring efficiency and inconvenience during the measurement of dynamic contact resistance of slip-ring, addressed improving methods for preventing the leads from intertwisting each other, and developed a measuring system for solving dynamic contact resistance measurement of slip-ring.

针对目前导电环动态接触电阻测量中由于导线缠绕导致检测效率低下、操作不便、不便较长时间观察导电环性能稳定性等问题，提出解决绕线问题的测量方法，并在此基础上研制一套导电环动态接触电阻测量系统，以解决动态接触电阻测量的技术难题。

The contactless inductive coupled power transfer system is one of the newest power transfer technology, which transmit energy to load by electromagnetic coupling and without electrical connection or physical contact, whats more, it comb-out contact existence of electric spark completely, reduce mechanical wear, and have the characteristics that safeguard operating non-maintaining or low.

非接触式感应耦合电能传输系统是一种新型的电能传输技术，它摆脱了传统供电方式通过导体直接接触供电的方式，通过感应电磁耦合关系向负载提供电能，彻底消除了接触电火花的存在，减小了机构磨损，具有免维护或低维护运行的特点。

Based on the simulation data, the effects of clearances, damping coefficient and the rotation speed on the dynamic behaviors are studied: compared with ideal mechanisms, mechanisms with clearances are less stable; as for mechanisms with clearances, when the crank rotates at the speed of 100rad/s, the actual clearances are always above the radium of clearances, axle pin and axle cover keep contact throught the rotation; when the crank rotates at the speed of 20rad/s, mechanisms are in an unstable state, at an angle of about 300, the actual clearances are below the radium of clearances, pairs lose contact, which results in collision between them; with the speed of 20rad/s, when damping coefficient is assumed 175Ns/m, distinct separation and collision happen between pairs; when damping coefficient is assumed 220Ns/m, separation and collision are controlled.

在含间隙机构中，当曲柄以100rad/s转动时，运动副间隙始终大於半径间隙，轴销与轴套始终保持连续接触；当曲柄以低速20rad/s转动时，系统处於极不稳定的震荡状态，在转至300°左右时，运动副间隙小於半径间隙，脱离接触，发生明显的分离碰撞现象。在含间隙机构中，曲柄以低速20rad/s转动，当取法向阻尼系数为175Ns/m时，副元素发生明显的分离碰撞现象；当取法向阻尼系数为220Ns/m时控制了副元素的分离，副元素一直处於连续接触状态。

The numerical results show that: the stress distribution on contact surface is relative to the relative velocity of sliding block and friction coefficient, and the maximum relative error of stress can be 100.08%. The non-linear Stribeck friction model can better describe the real situation of contact surface, because of the consideration of impact of the relative velocity to the friction.

研究结果表明：随着接触体相对速度的改变，摩擦因数相应变化，接触面上的应力与位移的分布随之改变，应力最大相对误差达100.08%；Stribeck模型考虑了速度对摩擦因数的影响，更能描述接触的真实情况。

The major advantage of PFC2D is the evolution regularity of microscopic fabric parameters including co-ordination number, contact normal, normal contact force, shear contact force, can be achieved together with the macroscopic liquefaction response. The micromechanism of sand liquefaction is further discussed.

颗粒流数值模拟的优点在于得到试样液化宏观力学表现的同时，通过不同循环加荷时刻试样内细观组构参量（包括配位数、接触法向分布、粒间法向接触力、粒间切向接触力）的演化规律，分析砂土液化过程中细观组构变化与宏观力学响应之间的内在联系，从而可进一步探讨砂土液化的细观力学机制。

Numerical simulations by assemblies of circular panicles can qualitatively reflect the general characteristics of liquefaction behavior of sand. The interval effect of aspect ratio of elliptical panicle on the mechanical behavior of numerical sample is obtained, and the reason is related to the initial average co-ordination number. The regularity of evolution of fabric in the process of sand liquefaction under cyclic loading can be qualitatively achieved by using the numerical sample randomly mixed of panicles with different shapes. Numerical simulations can not only demonstrate the macro phenomenon of particle breakage, mostly importantly, it can also expose the evolution of particle breakage microscopically, and would contribute to further research of the micromechanics of particle breakage.

研究结果表明：Hertz-Mindlin非线性接触模型适用于变围压条件下砂土力学性质模拟；纯圆颗粒模拟能够定性地反映饱和砂土振动液化的一般规律；颗粒长短比变化对砂土力学性质的影响具有区间效应，其原因与粒间初始平均接触数有关；不同形状随机混合试样能够从定性规律上反映振动液化过程中砂土的细观组构演化规律；数值模拟不仅可得到颗粒破碎宏观响应，而且可以分析内部接触力变化和实现对粘结破裂位置的追踪，从而可进一步研究颗粒破碎细观力学机制。

Main products: 1: Japan OMRON (between relays, time relays, temperature controller, photoelectric switch, proximity switches, trip switches, programmable logic controller) 2: Korea LG motor (air switch, contactors, thermal relays, magnetic starter, programmable logic controller) 3: Japan's Fuji motor (air switch, contactor, thermal relay, temperature controller, time relay, inverter, programmable controller, button, indicator light) 4: Japan's Mitsubishi Electric (air switch, contactors, thermal relays, Inverter, programmable controllers, servo series) 5: Korea AUTONICS (Photoelectric switch, close to-day clearance, temperature controller) 6: Taiwan CKC (time relay, the water level controller, solid state relays, counters) I Division otherwise operating Siemens, Schneider, and Stephen, RKC, days too, Hanyoung brands, such as industrial automation components, category range.

1：日本OMRON（中间继电器，时间继电器，温控器，光电开关，接近开关，行程开关，可编程控制器）2：韩国LG电机(空气开关，接触器，热继电器，磁力起动器，可编程控制器)3：日本富士电机（空气开关，接触器，热继电器，温控器，时间继电器，变频器，可编程控制器，按钮，指示灯）4：日本三菱电机（空气开关，接触器，热继电器，变频器，可编程控制器，伺服系列）5：韩国AUTONICS（光电开关，接近天关，温控器）6：台湾CKC（时间继电器，水位控制器，固态继电器，计数器）我司另有经营西门子、施耐德、和泉、RKC、天得、韩荣等品牌的自动化工控元件，品类繁多。

Distribution of contact stress and contact status of dovetail joint are obtained, and the location of fretting fatigue crack predicted.

针对燕尾榫连接结构，采用有限元技术求解接触问题，获得结构接触应力及接触状态量的分布，并预测裂纹萌生的位置。

First, the theory of fretting wear and studies on fretting fatigue were introduced and the parametric method was used in the process of creating the model of dovetail joints in UG software. The elastic contact problem is analyzed in finite element method and is used to the parameters' distribution and contact stress of the joint are obtained on the base of ANSYS code. With the effect factor of load frequency, the prediction method of fretting fatigue life of dovetail joint under low and high/low cycle complex load is proposed. The proposed model and the approach were verified by experiments.

本文介绍了微动损伤的机理和微动疲劳寿命的研究方法；利用UG软件对燕尾榫联接结构创建了参数化实体模型；基于ANSYS软件平台求解弹性接触问题，获得了榫联接结构接触应力及接触状态量的分布；在已有微动疲劳寿命预测模型的基础上，引入载荷频率影响因子，对低周、高低周复合载荷作用下的燕尾榫联接结构进行了微动疲劳寿命的预测，与试验结果对比表明采用本文提出的方法预测榫联接结构的微动疲劳寿命是有效的。

Results Of all the 1 279 consulters,63.6% had sexual behavior of high risk.The main risk factor was non-married sexual contact, of which 95.5% were taken between female and male,while 4.5% was between male and male .The rate of people testing voluntarily,men,women and female commercial severer was 81.7%,84.8%,71.0% and 69.9% respectively.80% consulters came in fear and the main questions asked were symptoms and signs of AIDS, characteristics of the incubation and the windows periods and the diagnosis and treatment of STD.

结果 1 279名求询者中，因有过高危性行为而咨询者占63.6%，主要危险因素以非婚性接触为主，其中95.5%为异性接触，4.5%为男男性接触；自愿接受检测者占求询者的81.7%，男性为84.8%，女性为71.0%，女性商业性服务者为69.9%。83%的求询者因有恐惧心理而前来咨询，咨询的主要问题有感染艾滋病的症状、表现、潜伏期、窗口期、性病的诊断和治疗。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。