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Software Development of Probabilistic Method Application in Mechanical Design

Author: LiuDaZhi
Tutor: SunZhiLi
School: Northeastern University
Course: Mechanical Design and Theory
Keywords: Mechanical Design Reliability Improved first order second moment Finite Element Mechanical reliability
CLC: TP391.7
Type: Master's thesis
Year: 2008
Downloads: 219
Quote: 0
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Abstract


Reliability refers to the ability of products in the required function under stated conditions for a specified time interval . With the continuous progress and development , the reliability of the product by the people more and more attention . With the current research status quo , the reliability calculation method from the static and dynamic theory further in-depth analysis , consider the basis of the load , considering the randomness of the material characteristics of the mechanical reliability analysis methods a broad overview of existing types of reliability analysis method , in order to be more reasonable classification and pointed out that the characteristics of the various types of analytical methods , limitations, as well as the scope of application , compared the advantages and disadvantages of the various calculations reliability method the implementation of the method , select the method used in a variety of design . The program is divided into static strength and fatigue strength of the design and calculation of reliability of stress - strength interference model and a second - order moment method to calculate the static strength program . In order to calculate the consistency of the results , this paper JC method and an improved second - order moment method precision and reliability of the parts ; in order to improve the accuracy , we use a probabilistic finite element analysis of the use of the existing finite element analysis software , calculate the mean and variance of the strain . According to the finite element stress-strain relationship , the calculated stress the determination of value , a first-order fluctuations and second-order fluctuations , and then calculate the reliability of the parts . The 3s - SN fatigue strength of the program part of the life prediction and calculation of reliability ; fatigue strength design stress - life model recently proposed for part of the life prediction and calculation of reliability . Finally, the example calculation . Object-oriented programming techniques , the use the Visual basic preparation of the corresponding program , and calculation software ANSYS integrated , developed a simple operation , practical , user-friendly reliability design with 3D modeling software Pro / E and finite element analysis system

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