机构运动仿真在机构设计中的应用

介绍了集成化工程分析软件I-DEAS机构学(Mechanism)模块的功能,通过机构运动模块在硫化机机构设计中的应用,实现了机构的运动学分析仿真,精确描述复合运动体空间运动,分析了机构空间运动位置及运动参数,并进行了干涉检查,为设计提供一种科学依据.     

机构运动仿真的机构设计中的应用

介绍了集成化工程分析软件I-DEAS机构学（Mechanism）模块的功能，通过机构运动模块在硫化机机构设计中的应用，实现了机构的运动学分析仿真，精确描述复合运动体空间运动，分析了机构空间运动位置及运动参数，并进行了干涉检查，为设计提供一种科学依据。     

Pro/E机构设计扩展模块在机构设计中的应用

结合插齿机主运动机构分析的实例,介绍Pro/E机构设计扩展模块在机构模拟仿真校验中的应用,为机构的精确设计提供一种新的思路和方法。     

基于Pro/E的齿轮-连杆组合机构的模型设计与运动仿真

齿轮-连杆组合机构可以实现较复杂的变速运动,利用Pro/E软件对一种齿轮—连杆组合机构进行了三维动画模型设计并对机构中的滑块、连杆及输出齿轮5的运动特性进行了一个周期内的运动仿真。通过对机构的三维模型动画分析,可以很快地判定组合机构的运动是否干涉,各构件的尺寸是否合理。利用Pro/E软件的机构运动分析模块(Mechanism)对机构中的构件进行运动仿真,大大降低了设计、仿真的难度,提高了设计效率与准确性。     

注塑机双曲肘合模机构运动仿真研究

研究了运用Pro/Engineer运动仿真模块Pro/Mechanism对双曲肘合模机构进行运动仿真建模的技术与方法,包括机构模型创建、驱动控制等进行了机构运动仿真,结果从运动的角度保证了合模机构的可行性和可靠性,将设计机构应用到整机开发,满足了功能和性能的要求。     

基于Pro/E的烟叶编杆机刺料机构运动仿真和动力分析

以Pro/E软件为设计工具,进行烟叶编杆机的设计,利用Pro/E的机构分析模块进行了刺料机构运动仿真和动力分析.     

基于SolidWorks的刀式折页机运动仿真

介绍了往复移动刀式折页机的工作原理,研究采用SolidWorks及其Motion模块对具有曲柄滑块-带传送系统-齿轮传动系统的组合机构的折页机进行机构分析和运动仿真,实现了折页机装配体的运动部件干涉检验和折页功能视觉传达,为组合机构产品设计提供了一种高效、直观的仿真手段,提高了复杂产品的分析设计能力。     

基于Pro/E槽轮机构三维建模及运动仿真分析

运用Pro/E软件对槽轮机构进行三维实体建模及装配,运用Pro/E的Mechanism模块对槽轮运动机构进行运动仿真分析,得出槽轮机构的速度、加速度随时间的变化曲线.利用该方法可以使得设计人员快速、直观的对槽轮运动机构进行优化设计.     

空间遥感详查相机输片摄影系统机构运动分析仿真

应用CAD/CAE技术的机构运动分析(Mechanisms)模块分析仿真空间遥感详查相机输片摄影系统的运动,进行干涉检查并得到输片机构和像移速度补偿机构的运动参数,对设计进行评价和修改。     

基于Pro／E的牛头刨床运动机构建模及其运动仿真分析

运用Pro/E软件对牛头刨床运动机构进行三维实体建模及装配,运用Pro/E的Mechanism模块对牛头刨床运动机构进行运动仿真分析,得出牛头刨床刨头的位移、速度、加速度随时间的变化曲线.利用该方法可以使得设计人员快速、直观的对牛头刨床运动机构进行优化设计.     

Reconstruction of blood flow patterns in human arteries

Local haemodynamic factors in large arteries are associated with the pathophysiology of cardiovascular diseases such as atherosclerosis and strokes. In search of these factors and their correlation with atheroma formation, quantitative haemodynamic data in realistic arterial geometry become crucial. At present no in vivo non-invasive technique is available that can provide accurate measurement of three-dimensional blood velocities and shear stresses in curved and branching sites of vessels where atherosclerotic plaques are found frequently. This paper presents a computer modelling technique which combines state-of-the-art computational fluid dynamics (CFD) with new noninvasive magnetic resonance imaging techniques to provide the complete haemodynamic data in 'real' arterial geometries. Using magnetic resonance angiographic and velocity images acquired from the aortic bifurcation of a healthy human subject, CFD simulations have been carried out and the predicted flow patterns demonstrate the non-planar-type flow characteristics found in experimental studies.     

An initial assembly scheme for mechanisms analysis programs with particular reference to AMP2D

The Advanced Mechanisms Program is designed to provide engineers with a means of analysing mechanical systems. A crucial facet of this task is to refine the approximate values for the positions and velocities of the individual bodies, provided by the engineer, in order to obtain a consistent set of initial conditions before the simulation proceeds. This paper discusses the theory of a new approach to the assembly problem and its implementation into a particular program.     

在机械原理教学中培养学生创新意识的探索

讨论了培养学生创新意识的重要性，结合各教学环节中教学手段和教学方法的改革，培养学生建立创新意识。阐述了机械原理教学过程中如何培养学生创造设计能力的探索与实践。     

Method for the synthesize of parallel-structure mechanisms for orientating a space telescope antenna

The problem of how to rotate a mirror system of a space telescope (reflector) by means of a parallel-structure mechanisms has been solved. Schemes of such mechanisms are presented. Mechanisms with three degrees of freedom, which are the simplest in terms of structure, are of the utmost interest.     

基于ADAMS的变胞机构动力学仿真

随着对变胞机构研究的深入,如何用虚拟仿真软件对变胞机构进行动力学仿真是一个急待解决的问题.通过对一个简单的变胞机构的构态变换过程进行分析,初步研究了如何利用adams软件对变胞机构进行建模和动力学仿真.将仿真结果与使用MATLAB建立数学模型计算的结果相比较,从而验证了其正确性.     

基于神经网络的智能化机构振动主动控制实验研究

进行了基于神经网络的智能化机构振动主动的实验研究，设计了具有压电陶瓷作动器与电阻应变计传感器的宏观智能化机构实验装置及其振动控制系统；根据实验样本数据，离线设计了神经网络控制器；采用基于神经网络的直接自校正控制策略对智能化机构实施了在线控制，机构的动力学品质得到了显著改善。     

Boundary lubricant films: a review

Boundary lubrication with anti-wear additives is examined. ‘Reaction films’, produced in may situations, have been extensively studied independently by the authors. This paper is a literature survey of this topic and gives the state of the art on ‘reaction film lubrication’ as a particular lubrication regime (compared to hydrodynamic regimes). Mechanisms of film formation are discussed.     

Physiological functions of FMRFamide-like peptides (FLPs) in crustaceans

Neuropeptides play important roles in chemical signalling in the central and peripheral nervous systems. One of the largest families of neuropeptides is that of the FMRFamide-like peptides (FLPs). This paper reviews what is known about the physiological functions of FLPs in crustaceans, focussing on the cardiovascular, digestive and neuromuscular systems.     

The measurement of blood flow waveforms from X-ray angiography. Part 2: Application to video recordings of digital subtraction angiography.

A method of measuring blood flow from X-ray angiograms recorded on cine film, by obtaining contrast mass values at numerous positions along individual vessels and at multiple instants of time, has been previously reported. In the present work it was hypothesized that the signal-to-noise limitations of recordings on video tape could be overcome by recording already-subtracted angiograms from a digital subtraction angiographic (DSA) system and that the spatial resolution of video was adequate to use a similar measurement method. Validation experiments were recorded, in which flows measured using a calibrated electromagnetic flowmeter passed through tubes of 4-7 mm diameter, during injections of 2-5 ml contrast medium. The video sequences were computer analysed and produced angiographic flow measurements agreeing with the electromagnetic flows to within 5 per cent. A case study of a clinical carotid artery DSA in a patient with secondary carcinoma metastases in the brain is described. It is concluded that accurate flow measurements can be made from DSA video recordings.