Archive of Mechanical Engineering最新文献_第4页

Development of identification procedure for the internal and external damping in a cracked rotor system undergoing forward and backward whirls 裂纹转子系统内外阻尼识别程序的发展

IF 0.7

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2019.128446

D. Roy, R. Tiwari

{"title":"Development of identification procedure for the internal and external damping in a cracked rotor system undergoing forward and backward whirls","authors":"D. Roy, R. Tiwari","doi":"10.24425/AME.2019.128446","DOIUrl":"https://doi.org/10.24425/AME.2019.128446","url":null,"abstract":"In the present work, a procedure for the estimation of internal damping in a cracked rotor system is described. The internal (or rotating) damping is one of the important rotor system parameters and it contributes to the instability of the system above its critical speed. A rotor with a crack during fatigue loading has rubbing action between the two crack faces,which contributes to the internal damping.Hence, internal damping estimation also can be an indicator of the presence of a crack. A cracked rotor system with an offset disc, which incorporates the rotary and translatory of inertia and gyroscopic effect of the disc is considered. The transverse crack is modeled based on the switching crack assumption, which gives multiple harmonics excitation to the rotor system.Moreover, due to the crack asymmetry, the multiple harmonic excitations leads to the forward and backward whirls in the rotor orbit. Based on equations of motions derived in the frequency domain (full spectrum), an estimation procedure is evolved to identify the internal and external damping, the additive crack stiffness and unbalance in the rotor system. Numerically, the identification procedure is tested using noisy responses and bias errors in system parameters.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944953","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: 6

Modelling the secondary bending in riveted joints with eccentricities 偏心铆接接头二次弯曲的建模

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131633

M. Skorupa, A. Korbel

{"title":"Modelling the secondary bending in riveted joints with eccentricities","authors":"M. Skorupa, A. Korbel","doi":"10.24425/ame.2008.131633","DOIUrl":"https://doi.org/10.24425/ame.2008.131633","url":null,"abstract":"For riveted joints with eccentricities of the load path, bending moments referred to as secondary bending are induced under nominally tensile loading conditions. Two simple theoretical models proposed in the literature to estimate the associated bending stresses are evaluated in the paper. Both approaches have been implemented in computer programs and applied to estimate the effect of several variables on the calculated bending stresses in the lap joint. Possibilities of the experimental and numerical verification of the models are also considered. Finally, a correlation between the secondary bending computed by one of the simple models and the observed fatigue properties of riveted specimens, as reported in the literature, is investigated. It is shown that deviations of the experimental results from the theoretical expectations stem from additional to secondary bending factors, like the inhomogeneous load transmission through the joint and the residual stresses induced by riveting process. These phenomena are known to be relevant to the fatigue behaviour of riveted joints, but they are not accounted for by the simple models. A conclusion from the present study is that despite the limitations and approximations inherent in the simple models, they provide reliable estimates of nominal bending stresses at the critical rivet rows and can be utilized in currently used semi-empirical concepts for predictions on the fatigue life of riveted joints.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544849","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: 8

Optimal stabilization of equipment in unsprung mobile machines 无弹簧移动机械中设备的最佳稳定

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131623

S. Chwastek, S. Michałowski

引用次数: 4

Methods of geometric parameters estimation for a mechanism based on point coordinates measurements 基于点坐标测量的机构几何参数估计方法

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132103

J. Knapczyk, M. Maniowski

引用次数: 1

The influence of liquid cargo properties on the discharge rate of submerged cargo pumps with hydraulic drive on modern product and chemical tankers 现代成品油和化学品船液货特性对液压驱动液货泵排量的影响

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131620

A. Banaszek

引用次数: 1

Static and dynamic analysis of the cableway 索道的静力和动力分析

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131632

J. Kowal, J. Snamina, A. Podsiadło, J. Konieczny

引用次数: 2

A new index for damage identification in beam structures based on modal parameters 基于模态参数的梁结构损伤识别新指标

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.138397

Reza Taghipour, Mina Roodgar Nashta, Mohsen Bozorgnasab, Hessam Mirgolbabaei

{"title":"A new index for damage identification in beam structures based on modal parameters","authors":"Reza Taghipour, Mina Roodgar Nashta, Mohsen Bozorgnasab, Hessam Mirgolbabaei","doi":"10.24425/ame.2021.138397","DOIUrl":"https://doi.org/10.24425/ame.2021.138397","url":null,"abstract":"The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135584647","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

148125 148125

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2023.148125

引用次数: 0

Slow flow past a weakly permeable spheroidal particle in a hypothetical cell 在一个假想的细胞中缓慢流过一个弱渗透性的球形粒子

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137044

引用次数: 0

Application of differential evolution algorithm for identification of experimental data 差分进化算法在实验数据识别中的应用

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2007.131561

Łukasz Maciejewski, Wojciech Myszka, Grażyna Ziętek

{"title":"Application of differential evolution algorithm for identification of experimental data","authors":"Łukasz Maciejewski, Wojciech Myszka, Grażyna Ziętek","doi":"10.24425/ame.2007.131561","DOIUrl":"https://doi.org/10.24425/ame.2007.131561","url":null,"abstract":"In the paper, the authors present the approach to modelling of austenitic steel hardening basing on the Frederick-Armstrong’s rule and Chaboche elastic-plastic material model with mixed hardening. Non-linear uniaxial constitutive equations are derived from more general relations with the assumption of an appropriate evolution of back stress. The aim of the paper is to propose a robust and efficient identification method of a well known material model. A typical LCF strain-controlled test was conducted for selected amplitudes of total strain. Continuous measurements of instant stress and total strain values were performed. Life time of a specimen, signals amplitudes and load frequency were also recorded. Based on the measurement, identification of constitutive equation parameters was performed. The goal was to obtain a model that describes, including hardening phenomenon, a material behaviour during the experiment until the material failure. As a criterion of optimisation of the model least square projection accuracy of the material response was selected. Several optimisation methods were examined. Finally, the differential evolution method was selected as the most efficient one. The method was compared to standard optimisation methods available in the MATLAB environment. Significant decrease of computation time was achieved as all the optimisation procedures were run parallel on a computer cluster.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637388","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: 2