关键词： 汽车零部件   中国市场   售后市场   副总经理   机械设备   总监   上海   生产商  

摘要： 迄今为止，岱高作为全球最大的汽车传动带生产商之一？其售后业务已经进入在中国发展的第三个年头．在AutomechanikaShanghai2013中．同样带来了创新的技术和产品，以满足中国市场的强大需求。

关键词： biodegradable stent   Alginate fibers   biodegradable composites   polylactide  

摘要： In the present article, new polylactide/alginate fibers composites were investigated. Composite pre-pregs were made by solution casting method. The aim of the study was to define physico-mechanical properties of developed materials. The scope of the studies included: examining the static mechanical properties, properties of the surface and their changes during degradation. Moreover, intensity of the release of degradation products to the environment and a change of the mass of examined samples were analyzed. Obtained results were evaluated taking into account possibility to use prepared composited as materials for vascular implants.

关键词： BLDMPEM   HEY   Three-phase half-controlled rectifier   Cruising condition  

摘要： Brush less Dual-Mechanical-Port Electrical Machine (BLDMPEM) is a new type of motor designed for Hybrid Electric Vehicle (HEV), which contains two mechanical ports and two electric ports. Compared with Dual-Mechanical-Port Electrical Machine (DMPEM), the brushless structure brings higher reliability and easier maintenance. In this paper, the model of BLDMPEM is discussed. In Chapter 2, the energy flow and mathematical model of BLDMPEM are analyzed. Then a novel three-phase half-bridge controlled rectifier topology and its control strategy for cruising mode of REV based on BLDMPEM are proposed in Chapter 3. Compared with the Field Oriented Control (FOC) strategy of BLDNPEM, the proposed method does not require accurate motor parameters, and it is much simpler and easier to be implemented. At last, simulation and experiment results show the feasibility and validity of the proposed strategy.

关键词： 多体动力学   机械设备   端点振动  

摘要： 多体动力学是当今机械工程领域研究的重点，同时也是难点。其为机械航空、兵器、机器人等领域的动态优化与评估提供了有利的技术支持与理论工具。本文首先以多体动力学的模型建立为研究基础，包括多体动力学模型中的坐标系的建立、模型元素、运动学参数计算、动力学方程以及管理体系的分析。然后通过多体动力学在工业机器人动力分析、柔性机械臂振动控制两个实例来表明多体动力学对于机械工程领域高精度制造与位置跟随中的科学应用。

关键词： CHEMICAL kinetics   MECHANICAL chemistry   DICYCLOPENTADIENE   DIOLEFINS -- Synthesis   CATALYSTS   RESEARCH   DIFFERENTIAL scanning calorimetry  

摘要： Isothermal curing of endo-dicyclopentadiene (endo-DCPD) using the first and second generation Grubbs' catalysts as the polymerization initiators was studied by means of differential scanning calorimetry (DSC) according to model-free isoconversional and model-fitting approaches. It revealed that the two Grubbs' catalysts exhibited apparent differences in ring-opening metathesis polymerization (ROMP) of endo-DCPD. The second generation catalyst was more efficient in catalytic activity for overall ROMP of endo-DCPD than the first generation catalyst, as evident from the reaction rate and fractional conversion (alpha). The model-free isoconversional method showed similar dependence of the activation energy (E-alpha) on a for the two catalyst systems;however, the second generation catalyst system involved a higher E-alpha, up to (alpha) approximate to 0.8, above which the E-alpha value suddenly drops with increase of conversion. The model-fitting method of the ROMP was satisfactorily described by the decelerating reaction and the autocatalytic reaction mechanisms for the first and the second generation catalyst systems, respectively. The effect of diffusion-control was incorporated into the model-fitting method to describe the ROMP reaction throughout the entire conversion. For fully cured samples (poly-DCPD), the first generation catalyst system has higher cross-linking density and lower tensile toughness relative to the second generation. Dynamic mechanical behaviors were also different for poly-DCPD formed using the two catalysts.

关键词： triboelectric nanogenerator   noncontact   rotational mechanical energy   self-powered system   high stability   active sensor  

摘要： In this work, we introduced an innovative noncontact, free-rotating disk triboelectric nanogenerator (FRD-TENG) for sustainably scavenging the mechanical energy from rotary motions. Its working principle was clarified through numerical calculations of the relative-rotation-induced potential difference, which serves as the driving force for the electricity generation. The unique characteristic of the FRD-TENG enables its high output performance compared to its working at the contact mode, with an effective output power density of 1.22 W/m(2) for continuously driving 100 light-emitting diodes. Ultrahigh stability of the output and exceptional durability of the device structure. were achieved, and the reliable output was utilized for fast/effective charging of a lithium ion battery. Based on the relationship between its output performance and the parameters of the mechanical stimuli, the FRD-TENG could be employed as a self-powered mechanical sensor, for simultaneously detecting the vertical displacement and rotation speed. The FRD-TENG has superior advantages over the existing disk triboelectric nanogenerator, and exhibits significant progress toward practical applications of nanogenerators for both energy harvesting and self-powered sensor networks.

关键词： GROUND state energy   CHEMICAL kinetics   CHEMICAL processes   MOLECULAR machinery (Technology)   ROTAXANES   ELECTRONIC apparatus & appliances  

摘要： The ability to design and confer control over the kinetics of the processes involved in the mechanisms of artificial molecular machines is at the heart of the challenge to create ones that can carry out useful work on their environment, just as Nature is wont to do. As one of the more promising forerunners of prototypical artificial molecular machines, chemists have developed bistable redox-active donor-acceptor mechanically interlocked molecules (MIMs) over the past couple of decades. These bistable MIMs generally come in the form of [2]rotaxanes, molecular compounds that constitute a ring mechanically interlocked around a dumbbell-shaped component, or [2]catenanes, which are composed of two mechanically interlocked rings. As a result of their interlocked nature, bistable MIMs possess the inherent propensity to express controllable intramolecular, large-amplitude, and reversible motions in response to redox stimuli. In this Account, we rationalize the kinetic behavior in the ground state fora large assortment of these types of bistable MIMs, including both rotaxanes and catenanes. These structures have proven useful in a variety of applications ranging from drug delivery to molecular electronic devices. These bistable donor-acceptor MIMs can switch between two different isomeric states. The favored isomer, known as the ground-state co-conformation (GSCC) is in equilibrium with the less favored metastable state co-conformation (MSCC). The forward (k(f)) and backward (k(b)) rate constants associated with this ground-state equilibrium are intimately connected to each other through the ground-state distribution constant, K-GS. Knowing the rate constants that govern the kinetics and bring about the equilibration between the MSCC and GSCC, allows researchers to understand the operation of these bistable MIMs In a device setting and apply them toward the construction of artificial molecular machines. The three biggest influences on the ground-state rate constants arise fr

关键词： NONLINEAR dynamical systems   MECHANICAL engineering   FRICTION   STRUCTURAL mechanics   EQUILIBRIUM   VIBRATION measurements  

摘要： Real applications in structural mechanics where the dynamic behavior is linear are rare. Usually, structures are made of components assembled together by means of joints whose behavior maybe highly nonlinear. Depending on the amount of excitation, joints can dramatically change the dynamic behavior of the whole system, and the modeling of this type of constraint is therefore crucial for a correct prediction of the amount of vibration. The solution of the nonlinear equilibrium equations by means of the Harmonic Balance Method (HBM) is widely accepted as an effective approach to calculate the steady-state forced response in the frequency domain, in spite of Direct Time Integration (DTI). The state-of-the-art contact element used to model the friction forces at the joint interfaces is a node-to-node contact element, where the local contact compliance is modeled by means of linear springs and Coulomb's law is used to govern the friction phenomena. In the literature, when the HBM is applied to vibrating systems with joint interfaces and the state-of-the-art contact model is used, an uncoupled approach is mostly employed: the static governing equations are solved in advance to compute the pre-stress effects and then the dynamic governing equations are solved to predict the vibration amplitude of the system. As a result, the HBM steady-state solution may lead to a poor correlation with the DTI solution, where static and dynamic loads are accounted for simultaneously. In this paper, the HBM performances are investigated by comparing the uncoupled approach to a fully coupled static/dynamic approach. In order to highlight the main differences between the two approaches, a lumped parameter system, characterized by a single friction contact, is considered in order to show the different levels of accuracy that the proposed approaches can provide for different configurations. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： 挖掘机   动力学   工作装置  

摘要： 机械式挖掘机工作装置的动力学研究是从挖掘机的理论动力特性曲线出发,以极端工况为计算条件,以工作装置的提升和推压系统的自然系统作为计算模型;将斗柄、动臂视为弹性体,运用拉格朗日方程建立9自由度工作装置的弹性动力学数学模型,有别于以往的刚体动力学模型;采用振型叠加法求得位移响应及各构件的最大动载荷及动载荷系数。研究中提出的挖掘机动力学分析方法,可适用于设计挖掘机新产品时的动力计算和强度校核,也可用于已有产品的动力评价。

关键词： 机械   减震   汽车  

摘要： 减震技术的核心是消除干扰性振动或找出解决的方法，因外部条件的不同，对减振器的使用要求也会相应的不同。在不同的国家或不同的地区，他们各自的天气环境、道路建筑等都有着很大的区别。单一的减振器是可能都满足他们的性能要求。