Journal of Engineering Mechanics and Machinery最新文献_第4页

Discussion on geothermal recovery process of deep borehole heat exchanger in layered stratum 层状地层深钻孔换热器地热开采工艺探讨

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070105

F. Chen, Yujie Bai

引用次数: 0

Load Distribution Optimization Method for Fatigue Test of Full-scale Structure of Biaxial Resonant Wind Turbine Blade 双轴共振风力机叶片全尺寸结构疲劳试验载荷分配优化方法

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070103

Lifang Zhang, Qiang Ma

{"title":"Load Distribution Optimization Method for Fatigue Test of Full-scale Structure of Biaxial Resonant Wind Turbine Blade","authors":"Lifang Zhang, Qiang Ma","doi":"10.23977/jemm.2022.070103","DOIUrl":"https://doi.org/10.23977/jemm.2022.070103","url":null,"abstract":"Wind turbine blade is the key component of wind turbine to realize wind energy capture, so it is necessary to verify the rationality of blade structure design through full-scale structural fatigue test. In order to improve the test accuracy and efficiency, this paper proposes to establish the dynamic analysis model of the multi-degree of freedom system of the tested blade by using the finite beam element to realize the calculation method of the load amplitude of the biaxial fatigue test and integrate the dynamic analysis model and the target load calculation method into the particle swarm optimization algorithm to realize the optimization of the load distribution of the biaxial resonant full-size structure fatigue test. Through the design of a biaxial resonant loading scheme of 2.5MW-52.5m wind turbine blades, the results show that this method can quickly and accurately adjust the optimization parameters such as the position of the exciter and the motion quality of the exciter in the flapwise and edgewise on the premise that the fatigue cumulative damage caused by the test load is not less than the cumulative damage of the target load.","PeriodicalId":32485,"journal":{"name":"Journal of Engineering Mechanics and Machinery","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68787783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Ball on the Rubber Band 皮筋上的球

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070401

Yifei Zhang, Youjia Feng, Liyi Yang

引用次数: 0

Design of H∞ Predictive Controller for Networked Control System 网络控制系统的H∞预测控制器设计

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070106

Wen-ying Chen, Jingyu Li

引用次数: 0

Overview of Spindle-Coupled Road Simulation Test Method for Vehicle Structure Durability 车辆结构耐久性轴耦合道路模拟试验方法综述

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070303

Guang Yanga, Zhiqiang Zhaob, Zhihui Niuc, Yong-Fu Wangd

引用次数: 0

Analysis of Elbow Stress Intensification Factors for Piping System 管道系统弯头应力增强因素分析

Journal of Engineering Mechanics and Machinery Pub Date : 2022-01-01 DOI: 10.23977/jemm.2022.070309

Zhuang Sun, Hongyan Zhang

{"title":"Analysis of Elbow Stress Intensification Factors for Piping System","authors":"Zhuang Sun, Hongyan Zhang","doi":"10.23977/jemm.2022.070309","DOIUrl":"https://doi.org/10.23977/jemm.2022.070309","url":null,"abstract":": In order to study the stress intensification effect of pipe elbow in the secondary stress check, the U-shaped pipeline commonly used in engineering was taken as the research object. The experiment platform for analysing pipe elbow stress was established, and the maximum stress with the displacement load was measured and compared with the results of the finite element analysis results and ASME B31.3 Code. On this basis, a correction formula calculating the Stress Intensification Factor (SIF) of elbows was proposed, and the influence of the wall thickness and the bend radius on the elbow stress distribution was studied. The results showed that pipeline displacement significantly affects stress for pipe bends, the stress of the elbow increased with in-plane displacement load. To ensure structural integrity for reliable working conditions for piping components, pipe displacement needs to be considered when designing bends. On this basis, a modified formula for calculating the SIF of in-plane elbow is proposed. Compared with the ASME code formula, this formula is closer to the actual stress value of the elbow due to considers the influence of pipe displacement on elbow stress. The stress value of the elbow obtained by finite element analysis essentially in agreement with the experimental value, and the average error is less than 5.16%. With simultaneous increase in bend radius and wall thickness there is a reduction in SIF. When either of the above parameters is increased on, and keeping others constant the SIF decreases. The influence of pipeline displacement on SIF is more for short bend radius and its effect decreases with increased bend radius.","PeriodicalId":32485,"journal":{"name":"Journal of Engineering Mechanics and Machinery","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68788190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0