查询词典 dynamic friction

The invention provides a low-friction sliding mechanism, a low-friction agent composition, a friction reduction method, a manual transmission and a final reduction gear unit that can exert very excellent low friction characteristics to sliding surfaces present under various applications, and, in particular, that have more excellent low friction characteristics than that of a combination of an existing steel material and an organic Mo compound.

本发明提供低摩擦滑动机构、低摩擦剂组合物、减小摩擦的方法、手动变速器和最终传动减速器，其在不同应用下会对所存在的滑动表面表现出极其优良的低摩擦特性，并且，尤其是其比现有的钢材和有机Mo化合物的组合具有更优良的低摩擦特性。

The author also studies the relationship between the maximum friction coefficient, optimum slip ratio, friction coefficent with locked wheels and three parameters in friction coefficient function of slip ratio, and three fit functions derived from experimental analysis, maximum friction coeffient, optimum slip ratio and friction coefficent v~ ith locked wheels, of aircraft speed.

利用试验数据研究了最佳滑移率、结合系数最大值和机轮抱死时的结合系数随飞机速度的变化规律。两者联系在一起，便得到了结合系数随飞机速度和滑移率的变化规律。它是本文的创新点之三。

When the car of system motive be stronger than the friction of the tire and will result in the tire lock die, once the occurrence tire lock die so tire and the friction of the ground from" quiet the friction"s become" to move the friction", not only the friction lowers significantly but even will lose to change direction to follow the vestige ability.

当剎车的制动力大过轮胎的摩擦力就会造成轮胎锁死，一旦发生轮胎锁死那么轮胎与地面间的摩擦就由『静摩擦』变成『动摩擦』，不但摩擦力大幅降低更会失去转向循迹能力。

Therefore, the torque required to open the gate valve required torque than the closure of large, in addition, for a pair of contact between the sealing surface, the Non Rising Stem Resilient Seated Gate Valves coefficient of static friction between them than the dynamic friction coefficient, to make them from the static state generate the relative movement is required to exert greater force to overcome the static friction; due to temperature changes, so that the sealing surface pressure between the larger, need to overcome the static friction force also will be bigger, so that when you open the valve on the stem nut on the sometimes increase the torque exerted a lot.

所以，开启闸阀所需的力矩比关闭闸阀所需的力矩大，此外，对于一对互相接触的密封面来说，它们之间的静摩擦系数也比动摩擦系数大，要使它们从静止状态产生相对运动，需施加较大的力以克服静摩擦力；由于温度变化，使密封面间的压力变大，需要克服的静摩擦力也随之变大，从而使开启闸阀时，对阀杆螺母上施加的力矩有时会增大很多。" Moment analysis of valve operation "是由中国闸阀网提供的国际阀门新闻，译文仅供参考。另外，中国闸阀网还提供相关产品搜索：闸阀型号、闸阀价格、闸阀技术、闸阀新闻、闸阀生产商等。

The thesis also discussed the synthetic influence of above factors on dynamic diagenesis in detail and graded dynamic diagenesis into three types, which were respectively thermally dynamic diagenesis, tectonically dynamic diagenesis and hydrokinetic diagenesis, and then the types of diagenesis controlled by dynamic factors had been studied: 1 thermally dynamic diagenesis, clarified the ration relationship by the conception of the thermally evolving track and the thermally maturity, 2 tectonically dynamic diagenesis, changed the porosity of reservoir mainly by tectonically movement;3 . hydrokinetic diagenesis, changed the physical and chemical properties resist-press intensity of the rock by the participating of liquid.

在研究以上控制因素的基础上，将成岩动力作用分为热动力、构造动力、流体动力成岩作用三种类型：1、热动力成岩作用，运用热演化轨迹和热成熟度的概念研究与成岩作用之间的定量关系，砂岩孔隙度随热成熟度增加而呈指数减小；2、构造动力成岩作用，盆地构造变形可以使砂岩的孔隙体积在相对短的时间内产生明显的变化，构造滑脱推覆作用比水平侧向挤压作用压实减孔量小，可保留更多的孔隙度；3、流体动力成岩作用，化学成岩反应是在流体参与下完成的，它改变了岩石的物理化学性质，改变了岩石的抗压强度。

The third chapter aims to discuss the self-organization essence, self-organization growth mechanism, the pattern of self-organization evolving growth.The fourth chapter aims to discuss particularly the correlative mechanism between clusters dynamic core capacity and clusters sustainable growth, and the obtaining of cluster sustainable competitive advantage basede on dynamic core capacity and the fostering and newing of cluster dynamic core capacity based on discussing the rigid competitive advantage. The fifth chapter aims to explain the effecting mechanism of government influencing cluster self-organization-evolvement and the fostering and upgrading of cluster dynamic capacity based on the theory gist of government surpports .The sixth chapter aims to analyse the High-tech industrial clusters of Silicon Valley in American and Low piezoelectricity cluster of Liu shi in zhengjiang province and explains to how self-organization , dynamic core capacity and government surpports effect industrial clusters sustainable gowth.The dissertation's main innovation lies in the following :mechanism model of cluster sustainable growth is constructed under dynamic environment based on self-organization theory and dynamic core capacity theory .

本文共分6章，第1章主要阐述本论文的研究背景、研究问题和研究意义，综述相关的国内外文献，并提出本论文的研究逻辑思路、研究方法和主要内容；第2章在对产业集群本质再认识和集群持续成长内涵分析的基础上，从自组织理论和动态核心能力理论视角，构建了动态环境下集群持续成长机制的概念模型；第3章主要探讨了集群持续成长的自组织本质、自组织成长机理和自组织演化成长模式；第4章在分析集群竞争优势刚性的基础上，提出集群动态核心能力的概念，分析了集群动态核心能力的构成要素及其对集群持续成长的作用机制，探讨了集群动态核心能力的演进与产业集群持续成长的关联机理，并进一步探讨基于集群动态核心能力集群持续竞争优势的获取问题，最后是关于集群动态核心能力的培育与更新的探讨；第5章在论述政府对集群支持的理论依据的基础上，分别探讨了政府对集群自组织演进和对集群动态核心能力的培育和提升的作用机制；第6章实例研究，论文选取了美国硅谷高科技产业集群和浙江柳市低压电器产业集群进行实例分析，研究了自组织、动态核心能力和政府支持三大机制在集群持续成长过程中的作用。

This thesis is based on crane dynamic theory and finite element theory, and utilized software platform of ANSYS. It realizes model analysis and transient analysis of steel rope and bridge structure. The data and conclusion offered effective method to bridge crane design. The thesis mainly includes:According to crane dynamic theory, established relevant dynamic model, and analyzed the dynamic properties of the bridge structure of the bridge crane, including the natural frequency, the model shape and the dynamic stress. A way to analyse the dynamic response of the bridge structure of the bridge crane which takes into account the dynamic properties of the steel rope pulley block has been explored successfully.

本文基于有限元理论和起重机动力学理论，以有限元分析软件ANSYS为平台，实现了计算机对钢丝绳系统和桥架的模态分析和瞬态动力学分析，得到的分析数据和结论对桥式起重机动态设计提供了有效的手段，论文主要内容包括：根据起重机动力学理论，建立了相关动力学模型，并对桥架结构进行动态性能分析(包括固有频率、振型以及动应力)的分析，探索出一种考虑钢丝绳滑轮组的动态特性在内的桥式起重机桥架结构动态应力分析的方法。

Though it is a long history of the research on static friction, many problems, such as relationship between static friction and static contact time, the relationship between static friction and load, and the prediction of static friction coefficient have not yet fully studied.

虽然静摩擦的研究历史很悠久，但仍有一些问题没有解决，如静摩擦与静止接触时间的关系，静摩擦与载荷的关系，以及静摩擦系数的预测等问题。

The results indicate that as the value of fractal dimension is increased, the interfacial static friction coefficient first increases and then decreases; the interfacial static friction coefficient decreases as the fractal roughness parameter increases; while the inter-facial static friction coefficient increases as the material property or total normal load increases; the curve of static friction coefficient versus dimensionless total normal load is convex when the fractal dimension becomes smaller or fractal roughness parameter is larger or material property becomes smaller.

研究结果表明：界面的静摩擦因数首先随分形维数的增加而增加，然后随分形维数的增加而减小；界面的静摩擦因数随分形粗糙度参数的增加而减小，但随材料特性的增加而增加，也随总法向载荷的增加而增加；当分形维数较小或分形粗糙度参数较大或材料特性较小时，静摩擦因数－量纲一的总法向载荷曲线为凸弧。

The results show that when the porosity of sample was higher, compressure rate was higher and resilience rate was lower, however resilient rate of sample with higher porosity were increased notably when pressure was increased, and it tended to accord with of sample with lower porosity. The friction coefficient was higher when porosity of paper-based friction material was higher, and the friction coefficient tended to reduce and stabilize when braking pressure was increased. The friction coefficient of sample with high porosity tended to reduce and stabilize in continuous braking cycles.

结果表明：在相同载荷下，随着孔隙率增大，材料的压缩率增加而回弹率降低，随着载荷增加，高孔隙率材料的回弹率先明显增大，而后趋于稳定；在相同比压和转速下，孔隙率越高，材料的摩擦系数越大，随着比压增加，孔隙率高的材料摩擦系数逐渐降低，且不同孔隙率材料的摩擦系数逐渐趋于一致；在连续循环制动时，高孔隙率材料的摩擦系数逐渐降低并趋于稳定。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。