Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics最新文献

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Comparative Study of Force Prediction Techniques Using Multi Component Accelerometer Force Balance for High Enthalpy Ground Testing 基于多分量加速度计力平衡的高焓地面试验力预测技术对比研究

Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics Pub Date : 2019-12-05 DOI: 10.1115/gtindia2019-2666

Abhishek Kamal, Gagan Chandra Das, V. Kulkarni, N. Sahoo

{"title":"Comparative Study of Force Prediction Techniques Using Multi Component Accelerometer Force Balance for High Enthalpy Ground Testing","authors":"Abhishek Kamal, Gagan Chandra Das, V. Kulkarni, N. Sahoo","doi":"10.1115/gtindia2019-2666","DOIUrl":"https://doi.org/10.1115/gtindia2019-2666","url":null,"abstract":"\u0000 Large wave drag and high surface heating are the major concerns of hypersonic flows. Hence, development of force measurement technique or prediction of force has always remained a promising research topic in this field. Present studies also deal with force prediction techniques and force balance calibration methodology for ground testing in an impulse test facility. A blunt double cone model is fabricated along with a three component accelerometer force balance. Impulse hammer hits are made on different locations of this test model. In these calibration experiments, the applied impulse and acceleration responses from three accelerometers are recorded. These calibration tests are repeated multiple times to apply hammer hits of different magnitude. All the input and corresponding output singles are then processed first to arrive at the impulse response function or correlation between input and outputs. Then the force recovery techniques are applied to recover the axial and normal forces generated during application of one of the calibration forces. The experimentally recovered force signals from different techniques are compared and then the accuracy of these predictions is estimated using different error estimation techniques. Such studies are found essential not only in defining the most accurate force prediction technique but also in understanding the time required for prediction by a particular technique. Additionally, such studies essentially helps to improve a force prediction algorithm.","PeriodicalId":224222,"journal":{"name":"Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127963011","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

Time Dependent Low Velocity Impact Response of Turbomachinery Blade Made of Porous Exponential FGM 多孔指数型FGM叶轮叶片低速冲击响应的时变特性

Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics Pub Date : 2019-12-05 DOI: 10.1115/gtindia2019-2785

A. Das, G. Agarwal, K. Inaba, A. Karmakar

{"title":"Time Dependent Low Velocity Impact Response of Turbomachinery Blade Made of Porous Exponential FGM","authors":"A. Das, G. Agarwal, K. Inaba, A. Karmakar","doi":"10.1115/gtindia2019-2785","DOIUrl":"https://doi.org/10.1115/gtindia2019-2785","url":null,"abstract":"\u0000 This study presents transient dynamic response of porous and non-porous exponential functionally graded (E-FGM) conical shells subjected to low velocity single and multiple impact. Hertzian contact law in modified form considering permanent indentation is used to calculate the impact response parameters. For finite element formulation eight-noded isoparametric shell element having five degrees of freedom per node is used. The dynamic equations for the low velocity impact problems are solved by Newmark’s time integration scheme. Parametric studies in terms of contact force, initial velocity of impactor, impactor displacement and shell displacement for Stainless Steel-Silicon Nitrite porous and non-porous conical shells (idealized as rotating turbo-machinery blade) under low velocity single and multiple impact are analyzed. Twist angle has significant effect on contact force but has marginal effect on contact duration. Contact force for perfect (porosity free) case is higher than that of porous one and the contact forces are found to decrease with higher porosity factor. Even porous FG conical shell is predicting lower contact force and higher shell displacement than that of uneven porous FG conical shell for a given porosity factor.","PeriodicalId":224222,"journal":{"name":"Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124131870","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