Experimental Techniques最新文献_第10页

Integration of Discrete Wavelet and Fast Fourier Transforms for Quadcopter Fault Diagnosis 集成离散小波和快速傅里叶变换用于四旋翼飞行器故障诊断

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-02-21 DOI: 10.1007/s40799-024-00702-3

A. A. Jaber, L. A. Al-Haddad

{"title":"Integration of Discrete Wavelet and Fast Fourier Transforms for Quadcopter Fault Diagnosis","authors":"A. A. Jaber, L. A. Al-Haddad","doi":"10.1007/s40799-024-00702-3","DOIUrl":"10.1007/s40799-024-00702-3","url":null,"abstract":"<div><p>Due to the extensive use of Unmanned Aerial Vehicles (UAVs) and the co-evolution of current technology, a key introduction to fault detection has arisen in recent studies in order to prevent unfortunate consequences. In this study, vibration-based signals from a commercially available innovative quadcopter flying in hover mode are collected using a vibration accelerometer, a data acquisition device, and a laptop. An ADXL335 accelerometer is fixed on the center of the drone where the centerlines of the four blades intersect. The superposition of numerous vibration arrangements over identical spectra hinders the ability to analyze the spectral data in the manner required to locate any framework's discrete vibration. This work presents a technique for separating a synthesized vibration signal towards discrete vibrations and other extraneous vibrations of a structure utilizing the Discrete Wavelet Transform (DWT) integrated with the Fast Fourier Transform (FFT). The research article findings in this study demonstrate the reliability and applicability of specific categories of discrete vibrations that are sorted out during the structural change evaluation to develop the best feasible strategy for removing the undesired and unanticipated vibration components and noise. The methodology demonstrated in this paper has the potential for practical application to multirotor UAVs in general.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"865 - 876"},"PeriodicalIF":1.5,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139945715","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

Parametrisation of Uniform Deformation in Ductile Metals Using Digital Image Correlation Technology 利用数字图像相关技术对韧性金属的均匀变形进行参数化分析

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-02-17 DOI: 10.1007/s40799-024-00704-1

J. Tabin, A. Brodecki

{"title":"Parametrisation of Uniform Deformation in Ductile Metals Using Digital Image Correlation Technology","authors":"J. Tabin, A. Brodecki","doi":"10.1007/s40799-024-00704-1","DOIUrl":"10.1007/s40799-024-00704-1","url":null,"abstract":"<div><p>This paper presents a novel measurement method that aims to qualitatively and quantitatively assess uniform deformation during displacement- and force-controlled tensile tests of ductile metals. The method utilizes digital image correlation technology to record the strain distribution during tensile testing, followed by the calculation of the floating root mean square (RMS) value of the strain amplitude along the specimen axis. By implementing this approach, the RMS-based profiles of strain amplitude are identified in different metals and alloys, including austenitic stainless steels, structural steel, copper, and aluminium alloys. Moreover, the proposed method holds potential for predicting important deformation characteristics such as distribution of intensive plastic zones, necking effect, and delocalization effect. Thus, it establishes a link between macroscale and microscale during the analysis of plastic deformation behaviour. The effectiveness of the new method is compared with existing strain and strain-rate methods. The novel approach demonstrates promising advantages in the context of the identification of metal-forming parameters.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"893 - 904"},"PeriodicalIF":1.5,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139902645","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

Test Setup for Investigating the Impact Behavior of Biaxially Prestressed Composite Laminates 用于研究双轴预应力复合材料层压板冲击行为的试验装置

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-02-08 DOI: 10.1007/s40799-024-00701-4

C. Pongratz, J. Tix, J. Wolfrum, S. Gerke, I. Ehrlich, M. Brünig

{"title":"Test Setup for Investigating the Impact Behavior of Biaxially Prestressed Composite Laminates","authors":"C. Pongratz, J. Tix, J. Wolfrum, S. Gerke, I. Ehrlich, M. Brünig","doi":"10.1007/s40799-024-00701-4","DOIUrl":"10.1007/s40799-024-00701-4","url":null,"abstract":"<div><p>Instrumented impact testing and compression-after-impact testing are important to adequately qualify material behavior and safely design composite structures. However, the stresses to which fiber-reinforced plastic components are typically subjected in practice are not considered in the impact test methods recommended in guidelines or standards. In this paper, a test setup for investigating the impact behavior of composite specimens under plane uniaxial and biaxial preloading is presented. For this purpose, a special test setup consisting of a biaxial testing machine and a specially designed drop-weight tower was developed. The design decisions were derived from existing guidelines and standards with the aim of inducing barely visible impact damage in laminated carbon fiber-reinforced plastic specimens. Several measurement systems have been integrated into the setup to allow comprehensive observation of the impact event and specimen behavior. A feasibility test was performed with biaxially prestressed carbon fiber-reinforced plastic specimens in comparison with unstressed reference tests. The compressive-tensile prestressing resulted in lower maximum contact forces, higher maximum deflections, higher residual deflections and a different damage pattern, which was investigated by light microscopic analysis. Finally, the functionality of the experimental setup is discussed, and the results seem to indicate that the test setup and parameters were properly chosen to investigate the effect of prestresses on the impacts behavior of composite structures, in particular for barely visible subsequent damages.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"851 - 864"},"PeriodicalIF":1.5,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-024-00701-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767283","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

Experimental Modeling and Multi-Response Optimization in Friction Stir Welding Process Parameters of AA2024-T3 Using Response Surface Methodology and Desirability Approach 利用响应面方法和可取性方法对 AA2024-T3 摩擦搅拌焊接工艺参数进行实验建模和多响应优化

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-30 DOI: 10.1007/s40799-023-00691-9

K. Boulahem, S. B. Salem, S. Shiri, J. Bessrour

{"title":"Experimental Modeling and Multi-Response Optimization in Friction Stir Welding Process Parameters of AA2024-T3 Using Response Surface Methodology and Desirability Approach","authors":"K. Boulahem, S. B. Salem, S. Shiri, J. Bessrour","doi":"10.1007/s40799-023-00691-9","DOIUrl":"10.1007/s40799-023-00691-9","url":null,"abstract":"<div><p>This work deals with the regression models and multi-objective optimization method of the ultimate tensile strength, percentage of elongation, and average arithmetic surface roughness of butt friction stir welded AA2024-T3 aluminum alloy. Machining experiments were carried out according to the face centered central composite design of the response surface methodology. The effect of friction stir welding process parameters such as rotation speed, welding speed, and tool shoulder diameter on responses was investigated. Adequacies of the models are checked by the analysis of variance. The optimization of multiple responses was performed using the desirability analysis to achieve the higher ultimate tensile strength, maximum percentage of elongation, and minimum arithmetic surface roughness. From this investigation, it is found that the joints fabricated with the tool rotational speed of 752 rpm, welding speed of 100 mm/min, and tool shoulder diameter of 12.5 mm yield the maximum ultimate tensile strength and percentage of elongation, and minimum arithmetic surface roughness of 379.69 MPa, 10.22% MPa, and 6.66 HV, respectively. The effects of process parameters on the microhardness of welded zone were studied. The macrostructure, microstructure, and residual stress characterization of joints are examined.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"833 - 849"},"PeriodicalIF":1.5,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139644596","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

A Lightweight Damage Diagnosis Method for Frame Structure Based on SGNet Model 基于 SGNet 模型的轻型框架结构损伤诊断方法

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-24 DOI: 10.1007/s40799-023-00697-3

C. Cai, W. Fu, X. Guo, D. Wu, J. Ren

{"title":"A Lightweight Damage Diagnosis Method for Frame Structure Based on SGNet Model","authors":"C. Cai, W. Fu, X. Guo, D. Wu, J. Ren","doi":"10.1007/s40799-023-00697-3","DOIUrl":"10.1007/s40799-023-00697-3","url":null,"abstract":"<div><p>Due to the complex structure of most frame structure, a large amount of sensor data needs to be processed for damage diagnosis, which increases the computational cost of diagnosis models and poses a serious challenge to their fast, accurate, and efficient damage diagnosis. In order to address this issue, this paper proposes a novel lightweight damage diagnosis method of frame structure for mobile devices based on convolutional neural networks. This method first uses mean filtering to process the vibration data collected by sensors, and then innovatively combines two convolutional neural network models, ShuffleNet and GhostNet, to form a new lightweight convolutional neural network model called SGNet, thereby reducing the computational cost of the model while ensuring diagnosis accuracy. In order to test the performance of the method proposed in this article, experimental research on damage degree diagnosis and damage type diagnosis is conducted by taking the frame structure provided by Columbia University as the research object, and comparative experiments of performance are conducted with MobileNet, GhostNet, and ShuffleNet. The experimental results show that the lightweight damage diagnosis method for frame structure proposed in this article not only has high damage diagnosis accuracy, but also has fewer computational parameters, when the highest accuracy is 99.8%, the computational parameters are only 1 million. At the same time, it is superior to MobileNet, GhostNet, ShuffleNet in terms of diagnosis accuracy and computational cost, so it is an effective high-precision lightweight damage diagnosis method for frame structure.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"815 - 832"},"PeriodicalIF":1.5,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139559849","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

Computing Effective Mass Using the Modal Craig Bampton Framework 利用模态克雷格-班普顿框架计算有效质量

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-24 DOI: 10.1007/s40799-024-00699-9

B. R. Pacini, R. L. Mayes

引用次数: 0

On the Cover: New Insights on the Effect of Forced Laser-Etched Nucleation on the Unsteady Evolution of Two-Phase Flow in a Beer Glass 封面：强制激光蚀刻成核对啤酒杯中两相流非稳态演化影响的新见解

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-24 DOI: 10.1007/s40799-024-00700-5

引用次数: 0

Statistical Analysis of the Vibrations Transmitted From an Electric Kick Scooter to Riders 电动脚踏车向骑行者传递振动的统计分析

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-24 DOI: 10.1007/s40799-023-00693-7

A. D. Vella, E. Digo, L. Gastaldi, S. Pastorelli, A. Vigliani

{"title":"Statistical Analysis of the Vibrations Transmitted From an Electric Kick Scooter to Riders","authors":"A. D. Vella, E. Digo, L. Gastaldi, S. Pastorelli, A. Vigliani","doi":"10.1007/s40799-023-00693-7","DOIUrl":"10.1007/s40799-023-00693-7","url":null,"abstract":"<div><p>In recent years, micro-vehicles have been increasingly involved in urban mobility following the actual trend towards light, more affordable, and eco-friendly means of transportation. Among this vehicle category, the electric kick scooters (e-scooters) represent the most popular example driven by app-based sharing mobility services. Despite the positive implications, poor safety requirements and issues of discomfort are also related to this new segment. The recent spread of e-scooters is motivating the scientific community in investigating performance and ride comfort, in the attempt of improving vehicle design and safety regulations. The aim of this study is to evaluate e-scooter vibrations in driving in a realistic environment, constituted by bike path with seven speed bumps. Fourteen healthy young participants (seven males and seven females) are asked to conduct the test at two different constant velocities (<span>(5)</span> km/h and <span>(25)</span> km/h). Accelerations are acquired at the main human body segments as well as on the e-scooter. The assessment is based on identifying maxima and root mean squares from signal time histories. A non-parametrical statistical analysis is performed focusing on vibrations transmitted from vehicle to human body, e-scooter velocity, and some rider’s characteristics such as gender, mass, dominant arm, and dominant foot. Root mean squares and tests at low velocity generally underline a larger number of significant differences. Moreover, the parameter which mostly influences the system is the rider’s mass. Overall, the proposed methodology proves to be an efficient tool to investigate the vehicle-rider vibrational influence.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"803 - 813"},"PeriodicalIF":1.5,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-023-00693-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139559848","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

Measurement of Residual Stress in Titanium Alloy Wide-Chord Hollow Fan Blade Based on Multiple-Cut Contour Method 基于多切面轮廓法的钛合金宽弦空心风扇叶片残余应力测量

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-24 DOI: 10.1007/s40799-024-00698-w

L.-X. Fan, N. Han

{"title":"Measurement of Residual Stress in Titanium Alloy Wide-Chord Hollow Fan Blade Based on Multiple-Cut Contour Method","authors":"L.-X. Fan, N. Han","doi":"10.1007/s40799-024-00698-w","DOIUrl":"10.1007/s40799-024-00698-w","url":null,"abstract":"<div><p>Hollow fan blades made of titanium alloy are widely used in turbofan engines, and the residual stress (RS) inside the blades directly affects the performance of the blades and even the engine. Therefore, it is crucial to measure and study the RS distribution of titanium alloy hollow fan blades. This paper aims to investigate the RS distribution on the cross-section of a wide-chord hollow fan blade made of Ti-6Al-4 V titanium alloy. The multiple-cut contour method is utilized to determine the RS. A theoretical model of the multiple-cut contour method for fan blades is established, and the specimen was cut three times, followed by contour measurement of the cut planes, data processing and elastic finite element analysis. The RS map of the three cut planes is finally presented. The normal RS on three cross-sections of the fan blade is uniformly distributed, ranging from -50 MPa to 50 MPa. The normal RS distribution at different positions for the hollow fan blade can be obtained by the proposed multiple-cut contour method. The findings of this research provide a comprehensive insight into the distribution of RS in wide-chord hollow fan blades made of Ti-6Al-4 V titanium alloy.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"793 - 802"},"PeriodicalIF":1.5,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-024-00698-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139560589","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

The Direct Coupling of Modal and Impedance Based Components 基于模态和阻抗的组件的直接耦合

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2024-01-10 DOI: 10.1007/s40799-023-00696-4

J. A. Seymour, P. Avitabile

{"title":"The Direct Coupling of Modal and Impedance Based Components","authors":"J. A. Seymour, P. Avitabile","doi":"10.1007/s40799-023-00696-4","DOIUrl":"10.1007/s40799-023-00696-4","url":null,"abstract":"<div><p>Substructuring is a term used to describe the estimation of the dynamics of a coupled system assembly when only the dynamics of each uncoupled component is available. Existing approaches allow for the coupling of physical-to-physical models, physical-to-modal models, modal-to-modal models referred to as Component Mode Synthesis (CMS), and impedance-to-impedance models referred to as Frequency Based Substructuring (FBS). Often times, the component information may not be just modal data for both components or just FRF data for both components so that modal substructuring or FRF substructuring can be performed. In these cases, the component data needs to be converted from either modal data or FRF data to match the data of the other component. A method for directly coupling impedance- and modal-based components has not yet been addressed. A proposed Impedance to Modal Substructuring (IMS) approach addresses this situation by writing the equations in a form that allows the user to directly utilize modal data for one component and FRF data for the other component, offering more flexibility in coupling different component data sets. While intended to be used with experimental data, this approach may also implement analytical components. In this work, an approach was developed to allow for the direct coupling of impedance and modal models without the need for the user to convert component data type. The IMS approach derived in this work was validated using analytical and experimental data with various models.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 5","pages":"775 - 792"},"PeriodicalIF":1.5,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139421280","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