Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Reliability measurement method for mechanical and electrical product

A measurement method and reliability technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the situation where one is a fuzzy variable and the other is a random variable, limit the practicability of the first type of method, disadvantageous And other issues

Active Publication Date: 2012-09-19
HEBEI UNIV OF TECH
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type of method must obtain the membership function of the fuzzy event "safety", but in engineering practice, it is difficult to directly obtain the membership function of the fuzzy security event in most cases, which greatly limits the use of the first type of method. Practicality
The second type of method is directly calculated on the basis of the distribution function of stress and strength, thus avoiding the problem of how to obtain the membership function of fuzzy safety events. It includes a variety of specific algorithms, such as calculation based on the concept of fuzzy set cut set , calculation based on the concept of closeness of two fuzzy sets, calculation based on the subtraction of two fuzzy numbers, etc., but the scope of application of each method is limited, specifically: some of these methods are only applicable to both stress and strength One of them is a fuzzy variable and the other is a random variable, and some methods are only applicable to the situation where both stress and strength are fuzzy variables
[0011] To sum up, there is currently no reliability measurement method that can be used in many situations where both stress and strength are random variables, both are fuzzy variables, and one is a random variable while the other is a fuzzy variable. In other words, the current various The scope of application of reliability measurement methods is limited, which is very unfavorable for the development of automatic calculation system of product reliability realized by computer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reliability measurement method for mechanical and electrical product
  • Reliability measurement method for mechanical and electrical product
  • Reliability measurement method for mechanical and electrical product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A measure of the reliability of a linkage mechanism.

[0066] The first step, the acquisition and classification of the stress data and strength data of the linkage mechanism

[0067]The link mechanism is subjected to tension when it is working. Currently, there are 150 tension or stress data available, and these 150 data are directly input into the computer by manual input; the tensile strength of the link mechanism has no ready-made data available. The destructive reliability test of the same type of connecting rod mechanism measured 80 pieces of tensile strength data. These data were collected and recorded by the data acquisition equipment based on single-chip technology, and these data were transmitted from the single-chip to the computer through the DB9 serial port connection line. From the number of stress data and strength data of the linkage mechanism, it can be judged that the stress here is a random variable and the strength is a fuzzy variable.

[0068] In t...

Embodiment 2

[0085] A reliability measurement of the pull-in function of the electromagnetic system of a new relay product.

[0086] The first step is to obtain and classify the generalized stress data and generalized strength data of the electromagnetic system of the new relay product

[0087] The failure criterion for the pull-in function of the electromagnetic system of the new relay product is: if the excitation voltage value when the electromagnetic system of the new relay product completes the pull-in action in the working state is greater than the given value of the stable pull-in voltage of the electromagnetic system, then it is judged that the The product fails, otherwise it is good. Therefore, when the electromagnetic system of the new relay product completes the pull-in action, the excitation voltage value is the generalized stress, and the given value of the stable pull-in voltage of the electromagnetic system is the generalized strength.

[0088] Generalized stress has no rea...

Embodiment 3

[0101] A reliability measure of an engine compressor disk.

[0102] The first step, the acquisition and classification of the stress data and strength data of the compressor disk of the engine

[0103] When the engine is working, the engine compressor disk will bear a certain force, and there are 1000 available stress data; the engine compressor disk is made of a specific material, and the manufacturer provides 200 strength data. Data is entered into the computer by manual entry. From the number of stress data and strength data of the engine compressor disk, it can be judged that the stress and strength here are both random variables.

[0104] The second step is the establishment of the stress probability density function and strength probability density function of the compressor disk of the engine

[0105] The stress data and strength data of the engine compressor disc obtained and classified in the first step are processed as follows to obtain the probability density func...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a reliability measurement method for a mechanical and electrical product, and relates to a digital computation method special for specific application. Random information and fuzzy information in generalized stress s and generalized strength r are comprehensively processed in a unified mode to obtain the reliability of the mechanical and electrical product, wherein each of s and r can be any combination of random variables and fuzzy variables; alpha belongs to U; vs(x) is a probability density function or a membership function of s, wr(y) is a probability density function or a membership function of r, and U is an effective domain of discourse of s and r; and an ordered pair (P, Q) consisting of P and Q is mapped into a point on a two-dimensional coordinate plane, all ordered pairs obtained when alpha is changed form a reliability curve, an area enclosed by the curve and two coordinate axes is R, and both the curve and the R are reliability measurement results. The shortcoming that the random variables and the fuzzy variables are required to be differently processed in the conventional method is overcome; the reliability measurement method is wide in application range; and the reliability measurement results imply much information, and a bridge between a probability reliability theory and a fuzzy reliability theory is built.

Description

technical field [0001] The technical scheme of the invention relates to a digital calculation method specially suitable for a specific application, specifically a reliability measurement method for electromechanical products. Background technique [0002] Product reliability refers to the ability of the product to complete normal work, specifically refers to the ability of the product as a whole, components or parts to complete the specified functions under specified conditions and within a specified time. [0003] With the development of science and technology, people have higher and higher requirements for product quality, performance and reliability. Product reliability has become the focus of product competition in various countries, and it is an important symbol of the quality of a country's technical team and the level of industrial foundation. . Product quality plays a decisive role in the success or failure of an enterprise's production and operation and its economi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李玲玲李志刚武猛朱芬芬
Owner HEBEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com