A new tolerance design method for LED Lamp driver with performance degradation model

2012 ◽  
Author(s):  
Yuege Zhou ◽  
Xuerong Ye ◽  
Guofu Zhai
Keyword(s):  
Design Method ◽  
Performance Degradation ◽  
Tolerance Design ◽  
Degradation Model

scholarly journals A Hybrid Tolerance Design Method for the Active Phased-Array Antenna

2020 ◽  
Vol 10 (4) ◽  
pp. 1435 ◽  
Author(s):  
Guodong Sa ◽  
Zhenyu Liu ◽  
Chan Qiu ◽  
Jianrong Tan
Keyword(s):  
Design Method ◽  
Array Antenna ◽  
Tolerance Design ◽  
Geometric Errors ◽  
Discrete Elements ◽  
Phased Array Antenna ◽  
Form Errors ◽  
Position Errors ◽  
Working Frequency ◽  
Effectiveness And Efficiency

With the increase of the working frequency of the array antenna, tolerance design has become increasingly important. The state-of-art tolerance design methods mainly deal with the position tolerance of the discrete elements. However, the geometric errors of the whole array have resulted from two aspects: (1) the position errors of the discrete elements and (2) the form errors of the continuous reflection plate. To optimize the position tolerance and flatness simultaneously, a hybrid tolerance design method is proposed. First, the relation between the performance of the array antenna and hybrid tolerances was determined based on the second order Taylor expansion. Then the expectation and variance of the performance were derived. Finally, the hybrid tolerances were optimized and the performance of the antenna was improved. Simulation results proved the effectiveness and efficiency of the proposed hybrid tolerance design method.

scholarly journals Assembly Tolerance Design Based on Skin Model Shapes Considering Processing Feature Degradation

2019 ◽  
Vol 9 (16) ◽  
pp. 3216 ◽  
Author(s):  
Ci He ◽  
Shuyou Zhang ◽  
Lemiao Qiu ◽  
Xiaojian Liu ◽  
Zili Wang
Keyword(s):  
Design Method ◽  
Joint Probability ◽  
Joint Probability Distribution ◽  
Manufacturing Cost ◽  
Tolerance Design ◽  
Sampling Point ◽  
Skin Model ◽  
Machined Surface ◽  
Assembly Tolerance ◽  
Five Axis

To increase the reliability and accuracy of tolerance design, more and more research works are considering not only orientation and position deviations; they are also forming errors in tolerance modeling. As a direct cause of form errors in industrial mass production, the processing features of the machining system degrade over time. Under the Industry 4.0 paradigm, an assembly tolerance design method based on Skin Model Shape is proposed to take the effect of degrading processing features into consideration. A continuous-time multi-dimensional Markov process is trained through maximum likelihood estimation based on the nodal sampling point set on the machined surface. Degradation of the machined surface is modeled based on the joint probability distribution of nodal displacements. Assembly force constraints and assembly entity constraints are applied to spatial assembly simulations. Tolerance synthesis takes the manufacturing cost and assembling probability as design objectives. A design example of the rotary feed component in a five-axis machine tool is proposed for explanation and verification.

A Robust Tolerance Design Method Based on Fuzzy Quality Loss

2006 ◽  
Vol 1 (1) ◽  
pp. 101-105 ◽  
Author(s):  
Yan-long Cao ◽  
Jian Mao ◽  
Jiang-xin Yang ◽  
Zhao-tong Wu ◽  
Li-qun Wu
Keyword(s):  
Design Method ◽  
Tolerance Design ◽  
Quality Loss

Tolerance design by set-based design method

2019 ◽  
Vol 2019.29 (0) ◽  
pp. 2313
Author(s):  
Haruo ISHIKAWA ◽  
Yasuhiro FUKUNAGA
Keyword(s):  
Design Method ◽  
Tolerance Design ◽  
Set Based Design

scholarly journals Reliability Analysis of Load-SharingK-out-of-NSystem Considering Component Degradation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Chunbo Yang ◽  
Shengkui Zeng ◽  
Jianbin Guo
Keyword(s):  
Reliability Analysis ◽  
Failure Rate ◽  
Load Sharing ◽  
Performance Degradation ◽  
Random Component ◽  
Rate Model ◽  
Successful Operation ◽  
Degradation Model ◽  
System Requirement ◽  
Degradation Effect

TheK-out-of-Nconfiguration is a typical form of redundancy techniques to improve system reliability, where at leastK-out-of-Ncomponents must work for successful operation of system. When the components are degraded, more components are needed to meet the system requirement, which means that the value ofKhas to increase. The current reliability analysis methods overestimate the reliability, because using constantKignores the degradation effect. In a load-sharing system with degrading components, the workload shared on each surviving component will increase after a random component failure, resulting in higher failure rate and increased performance degradation rate. This paper proposes a method combining a tampered failure rate model with a performance degradation model to analyze the reliability of load-sharingK-out-of-Nsystem with degrading components. The proposed method considers the value ofKas a variable which is derived by the performance degradation model. Also, the load-sharing effect is evaluated by the tampered failure rate model. Monte-Carlo simulation procedure is used to estimate the discrete probability distribution ofK. The case of a solar panel is studied in this paper, and the result shows that the reliability considering component degradation is less than that ignoring component degradation.

Study on Anti-Skid Performance Degradation of Coating-Type Color Anti-Skid Pavement

2014 ◽  
Vol 716-717 ◽  
pp. 314-318 ◽  
Author(s):  
Feng Liu ◽  
Jie Sun
Keyword(s):  
Material Selection ◽  
Interaction Mechanism ◽  
Surface Characteristics ◽  
Performance Degradation ◽  
Raw Material ◽  
Degradation Model ◽  
Coating Type ◽  
Set Up ◽  
Raw Material Selection ◽  
Effect Of Surface

This study starts with analysis of interaction mechanism of tire and pavement to analyze the factors influencing anti-skid performance in pavement surface characteristics and confirm pavement characteristics related to anti-slide performance. Besides, this paper further analyzes the effect of surface coating on pavement anti-skid performance. The specific experimental study mainly concentrates on raw material selection and evaluation and the study on the performance of different particle anti-skid pavements. This paper also measures friction coefficient of anti-skid section of the extension line of Beiyuan Avenue within the use for one and a half years. The degradation model is set up to evaluate pavement performance degradation. Further, this paper estimates Jinan the service life of the experimental section of coating-type color anti-skid pavement and carries out benefit analysis and development prospect.

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