Archive of Mechanical Engineering最新文献_第5页

Limit cycle oscillation prediction based on Finite Element-Modal approach 基于有限元-模态法的极限环振荡预测

IF 0.7

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2018.125439

K. Ahmad, Shigang Wu, H. Rahman

{"title":"Limit cycle oscillation prediction based on Finite Element-Modal approach","authors":"K. Ahmad, Shigang Wu, H. Rahman","doi":"10.24425/AME.2018.125439","DOIUrl":"https://doi.org/10.24425/AME.2018.125439","url":null,"abstract":"The central theme of this work was to analyze high aspect ratio structure having structural nonlinearity in low subsonic flow and to model nonlinear stiffness by finite element-modal approach. Total stiffness of high aspect ratio wing can be decomposed to linear and nonlinear stiffnesses. Linear stiffness is modeled by its eigenvalues and eigenvectors, while nonlinear stiffness is calculated by the method of combined Finite Element-Modal approach. The nonlinear modal stiffness is calculated by defining nonlinear static load cases first. The nonlinear stiffness in the present work is modeled in two ways, i.e., based on bending modes only and based on bending and torsion modes both. Doublet lattice method (DLM) is used for dynamic analysis which accounts for the dependency of aerodynamic forces and moments on the frequency content of dynamic motion. Minimum state rational fraction approximation (RFA) of the aerodynamic influence coefficient (AIC) matrix is used to formulate full aeroelastic state-space time domain equation. Time domain dynamics analyses show that structure behavior becomes exponentially growing at speed above the flutter speed when linear stiffness is considered, however, Limit Cycle Oscillations (LCO) is observed when linear stiffness along with nonlinear stiffness, modeled by FE-Modal approach is considered. The amplitude of LCO increases with the increase in the speed. This method is based on cantilevered configuration. Nonlinear static tests are generated while wing root chord is fixed in all degrees of freedom and it needs modification if one requires considering full aircraft. It uses dedicated commercial finite element package in conjunction with commercial aeroelastic package making the method very attractive for quick nonlinear aeroelastic analysis. It is the extension of M.Y. Harmin and J.E. Cooper method in which they used the same equations of motion and modeled geometrical nonlinearity in bending modes only. In the current work, geometrical nonlinearities in bending and in torsion modes have been considered.","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":"68944791","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

An efficient parallel global optimization strategy based on Kriging properties suitable for material parameters identification 一种适用于材料参数辨识的基于Kriging特性的并行全局优化策略

IF 0.7

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2020.131689

E. Roux, Y. Tillier, Salim Kraria, P. Bouchard

{"title":"An efficient parallel global optimization strategy based on Kriging properties suitable for material parameters identification","authors":"E. Roux, Y. Tillier, Salim Kraria, P. Bouchard","doi":"10.24425/AME.2020.131689","DOIUrl":"https://doi.org/10.24425/AME.2020.131689","url":null,"abstract":"Material parameters identification by inverse analysis using finite element computations leads to the resolution of complex and time-consuming optimization problems. One way to deal with these complex problems is to use meta-models to limit the number of objective function computations. In this paper, the Efficient Global Optimization (EGO) algorithm is used. The EGO algorithm is applied to specific objective functions , which are representative of material parameters identification issues. Isotropic and anisotropic correlation functions are tested. For anisotropic correlation functions, it leads to a significant reduction of the computation time. Besides, they appear to be a good way to deal with the weak sensitivity of the parameters. In order to decrease the computation time, a parallel strategy is defined. It relies on a virtual enrichment of the meta-model, in order to compute q new objective functions in a parallel environment. Different methods of choosing the qnew objective functions are presented and compared. Speed-up tests show that Kriging Believer (KB) and minimum Constant Liar (CLmin) enrichments are suitable methods for this parallel EGO (EGO-p) algorithm. However, it must be noted that the most interesting speed-ups are observed for a small number of objective functions computed in parallel. Finally, the algorithm is successfully tested on a real parameters identification problem.","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":"68945079","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

Hybrid GRA-PCA and modified weighted TOPSIS coupled with Taguchi for multi-response process parameter optimization in turning AISI 1040 steel 混合GRA-PCA和改进加权TOPSIS与田口组合优化AISI1040钢车削多响应工艺参数

IF 0.7

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2020.131707

Sultana Mst. Nazma, Dhar Nikhil Ranjan

引用次数: 6

Comprehensive analysis of tribological factor influence on stress-strain and thermal state of workpiece during titanium alloys machining 钛合金加工过程中摩擦学因素对工件应力应变和热状态影响的综合分析

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137049

引用次数: 1

Optimizing the weight of the two-level gear train in the personal rescue winch 个人救援绞车两级轮系重量优化

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.138393

引用次数: 1

Couple stress fluid past a sphere embedded in a porous medium 耦合应力流体通过嵌入在多孔介质中的球体

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.139314

引用次数: 7

Approximate dynamic programming in robust tracking control of wheeled mobile robot 轮式移动机器人鲁棒跟踪控制中的近似动态规划

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132098

Z. Hendzel, M. Szuster

引用次数: 1

Buckling of moderately thick annular plates subjected to torque 中等厚度环形板在扭矩作用下的屈曲

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2019.128445

Hamed Bagheri, Yaser Kiani, Mohammad Reza Eslami

引用次数: 0

Resonance phenomenon in the single stage cycloidal gearbox. Analysis of vibrations at the output shaft as a function of the external sleeves stiffness 单级摆线齿轮箱的共振现象。分析输出轴的振动与外套筒刚度的关系

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137050

Roman Król

{"title":"Resonance phenomenon in the single stage cycloidal gearbox. Analysis of vibrations at the output shaft as a function of the external sleeves stiffness","authors":"Roman Król","doi":"10.24425/ame.2021.137050","DOIUrl":"https://doi.org/10.24425/ame.2021.137050","url":null,"abstract":"In this paper a versatile analysis of the cycloidal gearbox vibrations and the resonance phenomenon was performed. The objective of this work was to show resonance phenomenon and vibrations study in the multibody dynamics model and in the ﬁnite element model of the cycloidal gearbox. The output torque was analyzed as a function of the external sleeves stiﬀness. The results from the multibody dynamics model were veriﬁed in the ﬁnite element model using natural frequency with load stiﬀening, direct frequency response and direct transient response analyses. It was shown that natural frequencies of the cycloidal gearbox undergo changes during motion of the mechanism. The gearbox passes through the thresholds of the increased vibration amplitudes, which lead to excessive wear of the external sleeves. The analysis in the multibody dynamics model showed, that the increase in the external sleeves stiﬀness increases frequency of the second-order ﬂuctuation at the output shaft. Small stiﬀness of the external sleeves guarantees lower frequency of the second order vibrations and higher peak-to-peak values of the output torque. The performed research plays important role in the cycloidal gearbox design. This work shows gearbox dynamics problems which are associated with wear of the external sleeves.","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":"135544624","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: 3

Vibro- and sound protection in road machines by means of vibration absorbing 用吸振的方法保护筑路机械的振动和声音

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131626

Z. Stotsko, B. Diveyev, O. Ljubas

引用次数: 0