嵌入式WINCE下CAN总线驱动程序研究

CAN总线是汽车电气系统广泛采用的总线,本文简单介绍了CAN总线的特点、用途.介绍了CAN控制卡的硬件设计,概述了WINCE平台下的驱动模型,重点叙述了WINCE平台下CAN控制卡的驱动实现.     

基于SJA1000的CAN系统节点设计

概述CAN控制器SJA1000的特点、内部结构、SJA1000的基本特征以及SJA1000控制器的工作原理。介绍CAN网络系统节点的一般构成。并以独立CAN控制器SJA1000为例,结合CAN协议介绍了通用CAN总线节点的硬件电路和软件设计方法。     

CAN总线在生物发酵控制系统中的应用

介绍了现场总线CAN的原理和特性，并根据其特点将其应用于生物发酵设备的控制系统中，由总线CAN连接各现场控制器和上位监控计算机构成工业现场底层网络。给出了控制系统的硬件设计原理，主要包括基于CAN总线控制器SJA1000的CAN总线接口和计算机接口卡的设计。最后介绍CAN协议的概况和通信软件设计思路，主要描述了CAN节点端SJA1000的通信软件组成。     

CAN总线在结晶器振动监控系统中的应用研究

根据CAN总线的技术特点,提出了基于CAN总线的结晶器振动监控系统设计方案,介绍了CAN总线网络结构和MC9S12DG128的CAN控制器结构.在硬件电路设计中,对CAN总线实现原理及设计要点进行了详细介绍,软件部分给出了以控制器为核心的CAN总线节点模块的应用层软件.实验表明:该通信系统性能稳定、可靠、成本低,具有较高的实用价值.     

CAN总线在电梯远程监控系统中的应用

介绍应用了CAN总线的电梯远程监控系统的组成结构及功能,详细描述了基于CAN总线的数据传输模块的工作方式以及过程,同时,还详细的介绍了CAN总线的功能特点及其控制器的功能。     

CAN总线在机电一体化中的应用

以液压综合试验台控制系统中各参量的检测与控制为例介绍CAN总线在机电一体化中的应用.文中介绍了CAN接口电路设计、SJA1000 CAN控制器的初始化流程和液压综合试验台控制系统的设计.     

CAN总线技术在前移式叉车中的应用

概述CAN总线特点及通信方式,详细介绍了前移式叉车控制系统总体结构设计、CAN总线接口单元设计及CAN总线节点的通信软件设计。     

CAN总线技术在风行景逸车身电子控制上的应用分析

介绍了CAN网络技术的定义和特点,分析了风行景逸车身电子控制CAN网络构建的必要性和可行性,提出了车身控制CAN网络架构和实现的功能.     

称重仪表的CAN总线通信设计

本文介绍了一种高速CAN总线称重仪表,该仪表集成了CANopen协议,以及仪表与传感器通信的内部CAN协议。文中对称重仪表CAN接口电路、CANopen应用协议及内部CAN协议设计的关键点进行了重点阐述。     

基于CAN总线的门禁读卡控制器设计

CAN总线是一种有效支持分布式控制和实时控制的现场总线控制网络。该文介绍了CAN总线在门禁系统中的应用设计,给出了门禁系统的整体结构和基于CAN总线的门禁读卡控制器的总体结构,着重介绍了读卡控制器的软硬件设计。     

叶切面最大厚度数值计算与应用

以叶切面最大厚度的数值计算方法为基础,探讨叶切面最大厚度计算的计算机实现,介绍叶切面厚度数值计算法的应用实例.     

Natural frequencies of vibration of a class of solids composed of layers of isotropic materials

In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape.     

膨胀套导向机构的设计

通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即：增加导向机构。     

螺旋桨桨叶叶面加工过程中加工量的计算

根据螺旋桨桨叶曲面加工精度和公差的要求，编制了计算机辅助工艺生成程序，求取了桨叶加工过程的最小打磨量，从而既保证了质量又大大提高了加工过程的效率。     

双丝杠驱动机构同步分析

介绍了双丝杠驱动机构工作原理,论述了双丝杠运动产生不同步的原因以及如何判定与解决同步问题。     

Analysis of models of friction in suspensions of vehicles

An analysis of the correctness of calculations during the modeling of oscillations of vehicles is carried out. A substantial difference between the calculation and experimental data in octave-frequency bands has been found and a low efficiency of suspensions of sprung seats has been emphasized. A comparative analysis of models of friction and dynamic characteristics used during the modeling of suspensions of vehicles is carried out. It has been shown that models of Coulomb and viscous friction do not ensure the required precision of the modeling process. A new model of friction in the form of totalities of models of elastic and viscous friction, as well as the implementation of this model using computer simulation, which ensures a calculation error of 5–15%, have been proposed.     

Specific features of operation of electrostatic microgenerators of energy

Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered.     

Analysis of similarity of physical processes during simulation of cooling of machine crystallizers

Similarity criteria describing physical the processes of boiling and condensation of a heat carrier were determined with a model and natural experiments based on the analysis of dimensions of parameters in the heat exchange problem during cooling of a crystallizer by heat pipes. Relationships of the geometrical sizes of heat pipes (diameter, length) were estimated. The novelty of the results is confirmed by patents of invention of catalyst cooling by heat pipes.     

轮胎单个横沟泵吸噪声计算方法研究

以205/50R16子午线轮胎为对象,建立具有横向花纹沟槽的有限元法分析模型,利用Abaqus/Explicit进行瞬态滚动分析,得到滚动轮胎单个横沟的体积变化。将其导入Fluent中,利用计算流体力学方法对单个横沟泵吸效益流场进行分析,并结合Lighthill声学类比理论预测横向沟槽的噪声,同时基于涡声理论验证流场与噪声之间的关系。结果表明,单个横沟泵吸噪声第一峰值集中在0.8～2.0 kHz附近,仿真数据与试验结果在趋势上具有一致性;且噪声的声压峰值出现在泵吸状态发生转变的时间段;在时域中的3个噪声峰值出现涡量变化较大的时间段,已确定噪声的变化可由涡量来反映。     

Method of implementation of the positive gradient of mechanical properties of triboengineering materials

Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface.