计算机辅助机械设计中的资料处理技术

计算机辅助机械设计中有许多复杂的数表和张圈需要处理。借助本文介绍的处理方法，可对常用的机械设计资料进行加工处理，使之成为程序可调用计算机可检索查询的形式，实践证明，这一方法是行之有效的。     

Determining the propagation path of a disturbance in multi-rate process and electromechanical systems

This paper proposes a multi-rate method to identify the propagation path of a persistent disturbance in an enlarged system envelope which includes the process plant and its electromechanical equipment. The need to integrate process and equipment diagnosis has been highlighted by industrial commentators. However, process and electromechanical measurements often have different sampling rates. The multi-rate method proposed extends a state-of-the-art propagation path method so that it combines fast-sampled electromechanical measurements and slow-sampled process measurements. The method is based on non-linear mutual prediction, which yields the directionality in the relationship between two time series. The method was demonstrated and validated, giving the expected outcome in an experimental case study, in which the root cause and propagation path of the disturbance were known.     

Supervised locally linear embedding projection (SLLEP) for machinery fault diagnosis

Following the intuition that the measured signal samples usually distribute on or near the nonlinear low-dimensional manifolds embedded in the high-dimensional signal space, this paper proposes a new machinery fault diagnosis approach based on supervised locally linear embedding projection (SLLEP). The approach first performs the recently proposed manifold learning algorithm supervised locally linear embedding (SLLE) on the high-dimensional fault signal samples to learn the intrinsic embedded multiple manifold features corresponding to different fault modes, and map them into a low-dimensional embedded space to achieve fault feature extraction. For dealing with the new fault sample, the approach then applies local linear regression to find the projection that best approximates the implicit mapping from high-dimensional samples to the embedding. Finally fault classification is carried out in the embedded manifold space. The ball bearing data and rotor bed data are both used to validate the proposed approach. The results show that the proposed approach obviously improves the fault classification performance and outperform the other traditional approaches.     

大型复杂起重机械结构三维有限元子结构模型分析

针对大型复杂的起重机械整体结构力学分析的难题,在子结构技术的基础上,建立了大型起重机械整体结构的有限元模型技术,以大型冶金铸造起重机为例详细阐述了大型复杂结构有限元模型简化原则和子结构划分方法,确保了整机的传力路线完整性,将大型冶金铸造起重机划分为三级子结构,重点突出了六大结构件,即主小车、副小车、主梁、副梁、端梁、行走结构,实现了整机三维有限元模型完整性和准确性。分析结果通过和试验、规范计算对比,应力和位移最大的误差分别为4.2%和4.9%,具有和试验一致性的结果,因此对于子结构的三维有限元模型技术方法在大型起重机械整体结构是可行的。     

加入WTO后，对广东机械工业的影响和对策

阐述加入WTO后对广东机械工业的影响，并提出相应的对策。     

GB5226.1-2008新版国家强制性标准综述

针对新版GB5226.1-2008国家强制性标准,本文介绍了该标准的基本情况、制修订背景、主要差异等方面内容,并讨论了标准的关键问题和使用指南等。     

Extraction of rules for faulty bearing classification by a Neuro-Fuzzy approach

In this paper, a classification system of faulty bearings based on a Neuro-Fuzzy approach is presented. The vibration signals in the frequency domain produced by the faulty bearings will be taken as the inputs to the classification system. In this sense, it is an essential characteristic for the used Neuro-Fuzzy approach, the possibility of taking a great number of inputs. The system consists of several Neuro-Fuzzy systems for determining different bearing status, along with a measurement equipment of the vibration spectral data. In this paper, a special attention is focused on the analysis of the rules obtained by the final Neuro-Fuzzy system. In fact, a rule extraction process and an interpretation rule process is discussed. Several trials have been carried out, taking into account the vibration spectral data collected by the measurement equipment, where satisfactory results have been achieved.     

基于Web的农机零件CAPP系统

简述计算机辅助工艺设计系统CAPP研究的意义及在国内外的研究现状与存在的问题,提出基于Web的农机零件CAPP系统的设计体系结构,介绍系统的各功能模块。     

GA308型浆纱机的应用及改进建议

分析GA308型浆纱机的机构特点及浆纱效果。通过在GA308型浆纱机上生产T/C 13.1 tex、C14.6 tex等多个品种,对GA308型浆纱机的机构运行情况及生产质量进行了研究与分析,浆纱质量及织造效果等指标表明,GA308型浆纱机采用七单元传动,结构简单,实现了电气、温度自动控制,精度高,可靠性高。指出,为了完善七单元浆纱机的性能,还要在经轴退绕装置、经轴架、浆槽循环管路、湿分绞装置等方面进行改进。     

起重机械制造信息化的探讨

简要分析了起重机械制造企业信息化程度不高的现状,就如何充分利用先进的工作手段来提高工作效率给出了具体措施和意见,并从4个方面阐述了提高起重机械制造信息化程度的途径和方法。