Experimental Techniques最新文献_第5页

Evaluating High Speed Linescan Extensometer for Dynamic Strain Analysis in Diverse Materials, Part I - Method Introduction 评估不同材料动态应变分析的高速线扫描延伸计，第一部分-方法介绍

IF 1.8 4区工程技术

Experimental Techniques Pub Date : 2025-09-08 DOI: 10.1007/s40799-025-00834-0

L. Zhang, R. Leonard III, J. Bennett, M. Jarachi, C. Hall, W. Whittington

{"title":"Evaluating High Speed Linescan Extensometer for Dynamic Strain Analysis in Diverse Materials, Part I - Method Introduction","authors":"L. Zhang, R. Leonard III, J. Bennett, M. Jarachi, C. Hall, W. Whittington","doi":"10.1007/s40799-025-00834-0","DOIUrl":"10.1007/s40799-025-00834-0","url":null,"abstract":"<div><p>This paper, the first in a two part series, investigates the capabilities of high speed linescan extensometry for dynamic strain analysis in mechanical testing environments. Through a series of experimental setups, this study evaluates the accuracy and reliability of the linescan extensometer in capturing strain data under varying conditions and compares its performance with traditional strain measurements techniques such as 2D Digital Image Correlation (DIC) and 1D wave theory calculations. Additionally, quasi-static rate tests were performed to assess the agreement between 1D (linescan extensometer), 2D DIC, and 3D DIC methods under low strain rate conditions. Experiments were conducted at multiple testing facilities, including Mississippi State University and Standard Mechanics LLC, utilizing a range of materials from polymers to metals under both tensile and compressive forces. The results confirm that the linescan exten- someter provides a viable and often superior alternative for recording dynamic strain, offering substantial benefits in terms of resolution and speed compared to established methods. This paper lays the groundwork for the subsequent statis- tical analysis in Part II, aimed at further evaluating these experimental findings through computational models.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 4","pages":"545 - 560"},"PeriodicalIF":1.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency Response Analysis of an Experimental Magnetic Levitation Test Bed 实验磁悬浮试验台频响分析

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-09-08 DOI: 10.1007/s40799-025-00831-3

S. M. Ahmad

引用次数: 0

On the Cover: Torque Converter Dynamic Characterization Using Torque Transmissibility Frequency Response Functions: Open Clutch, Hydro-Mechanical Responses 封面：使用转矩传递率的变矩器动态特性频率响应函数：开式离合器，液压机械响应

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-09-04 DOI: 10.1007/s40799-025-00835-z

引用次数: 0

Validity of Particle Image Velocimetry Measurements in Electrohydrodynamic Flows 粒子图像测速技术在电流体动力学中的有效性

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-09-03 DOI: 10.1007/s40799-025-00806-4

M. Daaboul, C. Louste

引用次数: 0

Research on Rail Corrugation Based on Vibration Characteristics and Operating Conditions of Damping Track 基于阻尼轨道振动特性和运行条件的轨道波纹研究

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-08-25 DOI: 10.1007/s40799-025-00833-1

X. Li, X. He, S. Zhao, Z. Ren, H. Fan, J. Cao

{"title":"Research on Rail Corrugation Based on Vibration Characteristics and Operating Conditions of Damping Track","authors":"X. Li, X. He, S. Zhao, Z. Ren, H. Fan, J. Cao","doi":"10.1007/s40799-025-00833-1","DOIUrl":"10.1007/s40799-025-00833-1","url":null,"abstract":"<div><p>With the increase in passenger capacity and operating frequency of urban rail transit, it has become one of the most severe problems for rail corrugation in the transportation system. The dynamic theory and finite element method are applied to establish a dynamic model of the vehicle-elastic track system. The mechanism and influencing factors of rail corrugation on metro damping track are analyzed, and the reasons for corrugation are obtained. The research results are as follows: (1) The simulated track vibration frequency is similar to the measured corrugation frequency, and the track vibration characteristics are related to the generation of rail corrugation. The wavelength range of the inner and outer rail corrugation obtained from on-site testing is 25–63 mm, which is consistent with the simulation results, verifying the correctness of the simulation and the feasibility of the method. (2) The coupling effects of vertical and lateral vibration on the track, as well as periodic changes in wheel-rail creep forces and wear number, promote the generation of rail corrugation. Ultimately, the track system resonance and periodic rail wear result in the initial formation of rail corrugation. (3) When larger vehicle loads, smaller curve radii, larger friction coefficients, and track failure, rail corrugation occurs earlier on the track, while the corrugation on inner rail is more severe.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 3","pages":"439 - 452"},"PeriodicalIF":1.9,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and Analytical Study of Initial Condition Effects On Nonlinear Vibrations of Thin-Walled Beams 薄壁梁非线性振动初始条件影响的实验与分析研究

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-07-25 DOI: 10.1007/s40799-025-00829-x

F. M. Nasrekani, H. Eipakchi, K. A. Mala, C. Micky, S. Narayan

{"title":"Experimental and Analytical Study of Initial Condition Effects On Nonlinear Vibrations of Thin-Walled Beams","authors":"F. M. Nasrekani, H. Eipakchi, K. A. Mala, C. Micky, S. Narayan","doi":"10.1007/s40799-025-00829-x","DOIUrl":"10.1007/s40799-025-00829-x","url":null,"abstract":"<div><p>In this work, an experimental and analytical study has been presented to investigate the effect of initial conditions on the nonlinear free vibration behavior of thin-walled beams. The nonlinear equations of motion have been extracted based on the first-order shear deformation theory (FSDT) and von Kármán relations to account for moderately large deflection. These equations have been solved analytically using the multiple-scale method to extract the linear and nonlinear natural frequencies and frequency response curves, analytically. Also, the free vibration data have been extracted from an experimental free vibration test by exciting the beam with an initial deflection. To study the effect of moderately large initial deflections on the free vibration response and natural frequency, different initial conditions have been applied, and the frequency analysis has been conducted using the power spectrum density (PSD) and Fast Fourier Transforms (FFT) for each case. Finally, the hardening and softening behavior was investigated in some samples. This study presents a novel application of a portable accelerometer with a simplified setup for nonlinear free vibration analysis, offering a practical and accessible alternative to conventional methods.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 3","pages":"425 - 437"},"PeriodicalIF":1.9,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-025-00829-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Propagation of Noise Uncertainty Through Virtual Strain Gauge Formulations for 2D Digital Image Correlation 通过虚拟应变片公式进行二维数字图像相关的噪声不确定性传播

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-07-22 DOI: 10.1007/s40799-025-00828-y

P.M. Beck

引用次数: 0

Study of the Effect of Bolted Joint Damping-Stiffness Nonlinearity on Part Failures in Dynamic Environment Testing 动环境试验中螺栓连接阻尼刚度非线性对零件失效影响的研究

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-07-22 DOI: 10.1007/s40799-025-00827-z

B. Clark, M. S. Allen, B. Pacini

{"title":"Study of the Effect of Bolted Joint Damping-Stiffness Nonlinearity on Part Failures in Dynamic Environment Testing","authors":"B. Clark, M. S. Allen, B. Pacini","doi":"10.1007/s40799-025-00827-z","DOIUrl":"10.1007/s40799-025-00827-z","url":null,"abstract":"<div><p>Bolted joints are very common in assembled structures and are a well-known source of nonlinear behavior in systems. This work explores the effect that nonlinearity can have on vibration environment testing, focusing on the nonlinear behavior that is typical to bolted structures. A single-degree-of-freedom system containing an Iwan joint is used to represent the mode of interest of a bolted structure. The nonlinearity is approximated as quasi-linear, or in other words, is characterized by amplitude-dependent natural frequency and damping ratio. The model was subjected to various environmental tests to understand how the outcomes of the test might be different for the nonlinear system as compared to a linear system. To facilitate this, a simple approach is developed that allows one to use the amplitude dependent frequency and damping to predict the behavior during an environmental test. The simulations show that the response of the nonlinear system could be significantly larger or smaller than expected if the system were linear, depending on the amplitude at which the system is driven and where the control accelerometer is located. If the environment is specified as a base acceleration, then nonlinearity in the component can cause the displacement, and thus the stress in the component, to be more than an order of magnitude larger or smaller than expected from a linear model. In contrast, if the control accelerometer monitors the mode of interest, then the target vibration levels will be obtained, yet with far different base excitation levels than would be expected if the system were linear. Because vibration-based testing requires certain vibration levels to be reached and maintained, these results may have implications for the vibration control software and the settings needed to successfully complete the test.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 1","pages":"163 - 174"},"PeriodicalIF":1.9,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modal Experiment and Finite-Element Model Updating for Huai-Beng Large Transmission Tower 淮州大型输电塔模态试验及有限元模型修正

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-07-16 DOI: 10.1007/s40799-025-00824-2

Z. Sun, J. Xu, Y. Zhu, H.-H. Zhou, J. Wang, X.-X. Cheng

引用次数: 0

Dynamic Friction Coefficient Measurement Using a New Torsion Split-Hopkinson Bar Technique 一种新型扭裂-霍普金森杆技术的动态摩擦系数测量

IF 1.9 4区工程技术

Experimental Techniques Pub Date : 2025-07-15 DOI: 10.1007/s40799-025-00822-4

M. Jarachi, A. Duncan, L. Zhang, H. Rhee, Y. Hammi, S. Kundu, B. A. Williams, W. R. Whittington

{"title":"Dynamic Friction Coefficient Measurement Using a New Torsion Split-Hopkinson Bar Technique","authors":"M. Jarachi, A. Duncan, L. Zhang, H. Rhee, Y. Hammi, S. Kundu, B. A. Williams, W. R. Whittington","doi":"10.1007/s40799-025-00822-4","DOIUrl":"10.1007/s40799-025-00822-4","url":null,"abstract":"<div><p>In this work, a Torsional Split-Hopkinson Bar (TSHB) was modified for rotating thin-walled steel rings in contact with a concrete disk under static precompression. The modified TSHB has been calibrated using Digital Image Correlation (DIC) Vic 2D software in combination with a Photron Fastcam high-speed camera. Using this modified TSHB, the velocity-dependent coefficient of friction between C300 maraging steel and concrete has been investigated. Three high strength types of concrete have been studied either in dry and lubricated conditions. It has been established that the friction coefficient decreases first rapidly as a function of velocity and it seems to stabilize after a certain velocity. The effects of lubrication on the frictional forces can be seen in the consistent reduction of the friction coefficient. Moreover, two axial forces of 7 and 10 MPa were applied to assess their effect on the friction coefficient. It was found that under dry conditions, the coefficient of friction increases slightly as the applied normal pressure increases for fiber-reinforced concretes, but it decreases for unreinforced concrete probably due to its brittle behavior. Finally, the static friction coefficient, which is the first value recorded when the sliding motion is produced, was validated by the inclined plane method. All of these observations are in good agreement with the friction theory and offer proof of the validity of the modified TSHB test method.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 3","pages":"413 - 424"},"PeriodicalIF":1.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-025-00822-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0