Dynamic Optimal Design for the Reliability of a Mechanical System

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Grey System Judgment on Reliability of Mechanical Equipment

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒｅｌｉａｂｉｌｉｔｙｏｆｍａｃｈｉｎｅｅｑｕｉｐｍｅｎｔｗａｓａｇｅｎｅｒａｌｌｙｃｏｎｃｅｒｎｅｄｐｒｏｂｌｅｍｏｎｃｈｏｏｓｉｎｇｔｙｐｅｓ ,ｕｓｅａｎｄｍａｉｎｔｅｎａｎｃｅｏｆｅｑｕｉｐｍｅｎｔａｎｄｓｏｏｎｉｎｔｈｅｗｈｏｌｅｃｏｕｒｓｅ.Ｔｈｅｍａｃｈｉｎｅｅｑｕｉｐｍｅｎｔｃｏｎｓｉｓｔｅｄｏｆａｃｏｍｐｌｉｃａｔｅｄｓｙｓｔｅｍ .Ｗｈｅｎｃｈｏｏｓｉｎｇｔｈｅｔｙｐｅｓ ,ｉｔｃｏｕｌｄｃａｒｒｙｏｕｔｏｐｔｉｍｕｍｄｅｃｉｓｉｏｎ ｍａｋｉｎｇｏ…     

精密机器人用RV传动系统的力学性能

目的了解RV传动机构的载荷分布,研究系统的力学性能。方法对精密机器人用2K-V型RV传动系统的结构进行简单介绍,分析RV传动的特点;对RV传动中的外啮合行星传动机构和内啮合摆线针轮传动机构的受力情况分别进行研究,并考虑摆线针轮的初始啮合间隙,多齿啮合原理以及曲柄轴转臂轴承的作用力。结果短幅系数K1的选取对摆线轮受力大小有直接的关系,摆线轮齿与针齿的啮合作用力与该啮合点处摆线轮齿实际弹性变形成线性正比关系。结论 RV传动系统在机器人领域具有广泛的应用前景,研究力学特性对RV传动机构的精度设计、制造加工提供了一定理论依据。     

检定数据网络传输可靠性及安全性的研究

随着互联网技术的发展,计量检定工作也更加科学高效。计量检定的所有管理数据信息和技术数据信息都已经融入到计量检定管理系统当中(如仪器收发信息、设备的期间核查、计量检定的电子原始记录等等)。本文主要对当专业实验室的主机采集到数据后,向计量检定管理系统数据库传输数据的过程中,数据库突然出现中断的处理及数据传输安全性的解决方法。     

基于数字仿真的机械产品可靠性测试方法标准研究

为解决由于标准缺失而导致的可靠性测试流程不清晰、模型构建不规范、关键参数选取标准不统一、结果正确检验方法缺失、可靠性增长难等问题,本文在分析基于数字仿真的机械产品可靠性测试方法标准需求和国内外标准现状的基础上,开展基于数字仿真的机械产品可靠性测试方法标准研究,包括流程要求、模型要求、仿真方法与要求、可靠性评价方法与要求、结果分析与可靠性增长要求,并介绍了项目研究过程中突破的一些关键技术。     

面向维修的机械系统可靠度预测与仿真研究

机电产品在服役期间因零件失效而产生故障,重组维修破坏了原有的系统可靠性模型,因而需要对设备可靠性问题重新进行研究和评价。基于机电系统中零件的失效时间分布密度函数,研究了在重组维护过程中机电系统服役期间零件年龄结构的分布规律,发展了机电系统可靠性数学模型。通过仿真研究,探讨了系统服役期间年龄结构、可靠度和失效率的发展规律,定量地研究了失效时间分布密度函数的参数对系统可靠度的影响。这对于评估机械系统的可靠性和全生命周期的失效率,制定合理的维修策略具有重要意义。     

A Study on Relationship between System Reliability and Reliability Cost

1 Introduction"RCquirement draught and technique drive" are the basic principles and heedspring of all hightechnologies. Increasing reliability is the impersonal requirement for modern systems, and therapid development of science and technology Inade these requirements possible. Systemreliability constitutes the system effectiveness with the oiller performance indices as well, and it. is well known that the reliability is compared to an "amplifier" of system effectiveness.Furthermore, the sys…     

人机系统可靠性设计研究进展

目的 研究人机系统可靠性设计理论。方法 通过对可靠性概念的描述,进而对机械可靠性、人的可靠性、人机系统可靠性的研究现状、主要分析方法及应用等方面的文献进行梳理与综合分析。初步构建了人机系统可靠性设计研究框架。结论 指出人机系统可靠性设计的未来发展趋势,为该领域进一步的研究提供参考。     

多馈入直流输电系统换相失败研究综述

常规高压直流输电系统存在换相失败的风险。对于多馈入直流输电系统而言,由于各交直流系统间的互相作用影响,单个直流回路发生换相失败可能会引起多条直流回路同时或者相继发生换相失败,给电网的安全稳定运行带来威胁。从换相失败的机理出发,引入多馈入交互作用因子来分析多馈入直流输电系统发生换相失败的影响因素和判据,总结了目前抑制换相失败的手段和策略,最后指出了在数学模型、换相失败耦合机理和抑制措施方面值得更深入的探讨和研究。     

An Analysis Method for Capability Reliability of a Thermal System

ＡｎＡｎａｌｙｓｉｓＭｅｔｈｏｄｆｏｒＣａｐａｂｉｌｉｔｙＲｅｌｉａｂｉｌｉｔｙｏｆａＴｈｅｒｍａｌＳｙｓｔｅｍＪｉｎＪｉａｓｈａｎＷａｎｇＳｈａｏｍｉｎｇＣａｉＱｉＮａｖａｌＡｃａｄａｍｙｏｆＥｎｇｉｎｅｒｉｎｇＷｕｈａｎ４３００３３，Ｐ．Ｒ．Ｃｈ...     

A Method of Reliability Allocation of a Complicated Large System

Aiming at the problem of reliability allocation for a complicated large system, a new thought is brought up. Reliability allocation should be a kind of decision-making behavior; therefore the more information is used when apportioning a reliability index, the more reasonable an allocation is obtained. Reliability allocation for a complicated large system consists of two processes, the first one is a reliability information reporting process from bottom to top, and the other one is a reliability index apportioning process from top to bottom. By a typical example, we illustrate the concrete process of reliability allocation algorithms.     

A Comparative Study of Using Grey Relational Analysis in Multiple Attribute Decision Making Problems

This paper uses grey relational analysis (GRA) method in multiple attribute decision making (MADM) problems. The advantages of using the GRA method include the followings: The results are based upon the original data, and the calculations are simple and easy to understand. It is one of the best methods to help management make decisions under business environment. Finally, an example is provided to show how this GRA method works in dealing with MADM problems. Moreover, the results from other methods are compared including the technique for order preference by similarity to ideal solution and operational competitiveness rating method.     

Study of Movement Reliability for Hoisting Jack under a Rocket Launcher Vehicle

The transmission mechanism of a jack is required to support the combat vehicle reliably within a very short time.So reliability research is very important because the mechanism completes motions required under the conditions within limited time.If the transmission mechanism of the jack supports the rocket launcher steadily,it needs to go through several stages as follows:unlocking,starting,operating,braking,stopping,fixing position and locking.The transmission mechanism of the jack is a complicated and single degree of freedom mechanical system;it can be considered an imaginary mechanical model that has an equivalent moment of inertia and equivalent torque.According to the characteristics of each supporting stages,dynamics equations of the mechanism are established.At the stages of starting and operating,a driving moment and resistance moment are dealt with for a Normal distribution.The design principles for movement reliability of completing action are established and the design principles for time reliability of completing action within a limited time are established.Finally,movement reliability of the transmission mechanism of the jack is 0.9 852,according to our calculation.Reliability of time to complete action is 0.9 943.     

基于FTA-FMMEA综合分析法的发动机曲柄连杆机构可靠性研究

为了提高发动机曲柄连杆机构的可靠度,采用FTA-FMMEA综合分析法对其进行分析。通过分析曲柄连杆机构各零件的故障,建立故障树模型,对其进行定性分析找出对系统影响较大的故障模式;对其中的活塞环磨损这一故障模式进行FMMEA分析,得到了其故障原因及故障机理,确定了其故障影响,并根据分析结果提出改进方案。改进前后的RPN值对比结果表明,FTA-FMMEA综合分析方法可以很好的分析系统故障并提高系统可靠性水平。     

基于可靠性理论的故障诊断法的研究

提出了基于可靠性理论的故障诊断法，旨在准确识别故障。文中使用的可靠性理论包括寿命数据分析理论、概率分布干涉模型和系统可靠性模型。给出了可靠性理论应用于故障诊断的数学模型和汽轮发电机组的应用实例。     

非电导爆管起爆系统拒爆原因及准爆技术分析

通过几年的工种实践，对在非电导爆管起爆系统的使用时所发现的拒爆原因进行分析，并提出了一系列有效的预防措施以供爆破界同仁参考。     

KV490 柴油机工作过程故障的灰色诊断

目的对某柴油机工作过程的故障进行诊断.方法采用灰色系统理论的ABO型关联度分析方法.结果准确地诊断出柴油机工作过程的正常状态和故障状态.结论灰色ABO型关联度对柴油机工作过程的故障诊断具有较高的准确度.     

全自动苹果削皮机传动系统设计

在市场调研的基础上,通过对已有产品的特点进行比较与研究分析,开发了一种新的全自动苹果削皮机,实现了上料、削皮、去核与卸果整个工作过程的全自动。传动系统增加了全自动上料系统,可完成苹果自动输送、摆正、插果的动作;自仿形刀架驱动系统,可根据苹果椭圆度的不同,完成准确去皮;保留了原自动转位工作台机构。该全自动苹果削皮机机构紧凑,节省人力,生产率和制成率高。