Gotowe bibliografie tematyczne / Cantilever beam experiment

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Gotowa bibliografia na temat „Cantilever beam experiment”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Cantilever beam experiment"

Němeček, Jiří, Jan Maňák i Jiří Němeček. "MODELING OF MONOCRYSTALLINE MAGNESIUM MICROBEAM BENDING". Acta Polytechnica CTU Proceedings 15 (31.12.2018): 69–73. http://dx.doi.org/10.14311/app.2018.15.0069.

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This paper presents a numerical simulation of a micro-scale experiment on a magnesium alloy. Micro cantilever beams were fabricated using Focused Ion Beam technology in a single crystal of Mg. The cantilever beams have dimensions in the order of a few micrometers and a pentagonal cross section. Nanoindenter was used for cantilever beam bending and load-displacement curve was received. Cantilevers with two different crystallographic orientations were chosen for the experiment. Three dimensional numerical FE model with elastoplastic behavior respecting crystal anisotropy was used to fit experimental load displacement curves. Strengths and deformation energy were evaluated from the models for each cantilever.

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Žiga, Alma, i Josip Kačmarčik. "Plywood Cantilever Deflection". Drvna industrija 74, nr 1 (25.03.2023): 81–91. http://dx.doi.org/10.5552/drvind.2023.0053.

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In this paper, the elastic behaviour in bending of three-layer plywood cantilever beams is analysed. Deflections of straight and half-circle cantilevers, loaded with a force at free end is determined experimentally and calculated using analytical and finite element method approach. The analytical calculation of deflection for the strait cantilever is obtained using a transformed cross section. The deflection of half-circle cantilever is determined by the classical laminated plate theory and Castigliano’s theorem. Loads and cantilever dimensions are varied in the study using the design of experiment. The deflection regression models for straight and semicircular plywood cantilevers are obtained from the experimental results. Analytically and numerically determined deflections of strait and half-circle cantilevers show very good agreement. Experimentally recorded deflections are approximately 30 % higher than analytical values. Stiffness properties and deflection values are influenced by direction of fibres in the outer layers of a three-layer plywood beam.

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Hu, Hai Tao, Yu Long Li i Jin Li Wang. "Vibration Fatigue Behavior of 2024-T62 Aluminum Alloy Cantilever Beam under Different Vibration State". Key Engineering Materials 525-526 (listopad 2012): 253–56. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.253.

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The vibration fatigue experiments of cantilever beam structures were performed to investigate the fatigue behavior of 2024-T62 aluminum alloy. Two types of cantilever beams with various natural frequencies under the sinusoidal excitation were investigated. The initial stress of two types of specimens were set in the same amplitude by adjusting the acceleration of electrodynamic shaker. Based on the stress history recorded by the strain gauge in fatigue test and the Miners liner cumulative damage rule, the fatigue damage of the cantilever beam was calculated. The effect of vibration state on the vibration fatigue behavior of the cantilever beam was discussed. The experiment results show that the fatigue life of the cantilever beam, of which the initial vibration state is resonance, is longer than that of non-resonance. The calculated damage results were in accord with the reduction of the natural frequency measured in experiment. The reduction of natural frequency could be used to evaluate the fatigue damage of structures.

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Santos, Erivelton, i Hanz Richter. "Design and Analysis of Novel Actuation Mechanism with Controllable Stiffness". Actuators 8, nr 1 (9.02.2019): 12. http://dx.doi.org/10.3390/act8010012.

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Actuators intended for human–machine interaction systems are usually designed to be mechanically compliant. Conventional actuators are not suitable for this purpose due to typically high stiffness. Advanced powered prosthetic and orthotic devices can vary their stiffness during a motion cycle and are power-efficient. This paper proposes a novel actuator design that modulates stiffness by means of a flexible beam. A motorized drive system varies the active length of the cantilever beam, thus achieving stiffness modulation. New large deflection formulation for cantilever beams with rolling contact constraints is used to determine the moment produced by the actuator. To validate the proposed solution method, an experiment was performed to measure large static deformations of a cantilever beam with the same boundary conditions as in the actuator design. The experiments indicate excellent agreement between measured and calculated contact forces between beam and roller, from which the actuator moment is determined.

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Wu, Hao, Lihua Tang, Yaowen Yang i Chee Kiong Soh. "A novel two-degrees-of-freedom piezoelectric energy harvester". Journal of Intelligent Material Systems and Structures 24, nr 3 (21.08.2012): 357–68. http://dx.doi.org/10.1177/1045389x12457254.

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Energy harvesting from ambient vibrations using piezoelectric effect is a promising alternative solution for powering small electronics such as wireless sensors. A conventional piezoelectric energy harvester usually consists of a cantilevered beam with a proof mass at its free end. For such a device, the second resonance of the piezoelectric energy harvester is usually ignored because of its high frequency as well as low response level compared to the first resonance. Hence, only the first mode has been frequently exploited for energy harvesting in the reported literature. In this article, a novel compact piezoelectric energy harvester using two vibration modes has been developed. The harvester comprises one main cantilever beam and an inner secondary cantilever beam, each of which is bonded with piezoelectric transducers. By varying the proof masses, the first two resonant frequencies of the harvester can be tuned close enough to achieve useful wide bandwidth. Meanwhile, this compact design efficiently utilizes the cantilever beam by generating significant power output from both the main and secondary beams. An experiment and simulation were carried out to validate the design concept. The results show that the proposed novel piezoelectric energy harvester is more adaptive and functional in practical vibrational circumstances.

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Wang, Fei, i Xue Zeng Zhao. "Nondestructive Detection of a Crack in a Triangular Cantilever Beam Based on Frequency Measurement". Key Engineering Materials 353-358 (wrzesień 2007): 2285–88. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2285.

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Triangular cantilevers are usually used as small force sensors in the transverse direction. Analyzing the effect of a crack on transverse vibration of a triangular cantilever will be of value to users and designers of cantilever deflection force sensors. We present a method for prediction of location and size of a crack in a triangular cantilever beam based on measurement of the natural frequencies in this paper. The crack is modeled as a rotational spring. The beam is treated as two triangular beams connected by a rotational spring at the crack location. Formulae for representing the relation between natural frequencies and the crack details are presented. To detect crack details from experiment results, the plots of the crack stiffness versus its location for any three natural modes can be obtained through the relation equation, and the point of intersection of the three curves gives the crack location. The crack size is then calculated using the relation between its stiffness and size. An example to demonstrate the validity and accuracy of the method is presented.

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Hajhosseini, Mohammad, i H. Nahvi. "Identification of Slant Cracks in a Cantilever Beam Using Design of Experiment and Neuro-Genetic Technique". Key Engineering Materials 488-489 (wrzesień 2011): 138–41. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.138.

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Cracks present a serious threat to the performance of beam-like structures. In this paper, the flexural vibration of a cantilever beam having a slant crack is considered. The beam natural frequencies are obtained for various crack locations, depths and angles, using the finite element method. These natural frequencies and crack specifications are then used to train a neural network. The input of the neural network is the crack specifications and the output is five natural frequencies of the beam. With the trained neural network, genetic algorithm is then used to determine the beam crack specifications by minimizing the differences from the measured frequencies. Simulations are performed to evaluate performance of the neural network. Results show that the proposed scheme can detect slant cracks in cantilever beams with good accuracy.

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Wi, Daehan, i Angela Sodemann. "Investigation of the size effect on the resonant behavior of mesoscale cantilever beams". Journal of Vibration and Control 25, nr 23-24 (17.09.2019): 2946–55. http://dx.doi.org/10.1177/1077546319872311.

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A vibrational resonant cantilever beam device is a type of tactile vision substitution device for the visually impaired that has the potential to achieve a high resolution in a small space. In order to realize a device of this type, it is necessary to accurately model the resonant behavior of the mesoscale (0.1–1.0 mm) metal cantilever beams of which the device is composed. Specifically, the natural frequencies and damping ratios of these beams must be analytically modeled in order to design beam dimensions for the device. In this paper, the resonant frequencies and damping ratios of a set of A2 tool-steel mesoscale cantilever beams are obtained using three different methods: calculation based on a mass–spring–damper model of the beams; a forced response experiment; and a free response experiment. The results are compared, and the size effect on stiffness and elastic modulus is investigated. Based on the modified couple stress theory, the length scale parameter is calculated. The damping ratio difference depending on the dimension of material in the mesoscale is also investigated.

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Tamil Selvan, Ramadoss, W. A. D. M. Jayathilaka, Amutha Chinappan, Hilaal Alam i Seeram Ramakrishna. "Modelling and Analysis of Elliptical Cantilever Device Using Flexure Method and Fabrication of Electrospun PVDF/BaTiO3 Nanocomposites". Nano 15, nr 01 (styczeń 2020): 2050007. http://dx.doi.org/10.1142/s1793292020500071.

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Cantilever-based piezoelectric has been the most preferred technique for energy harvesting and sensing application due to its simple design. The energy conversion efficiency has been continuously improved by exploring alternative cantilever geometries by increasing the stress distribution on the beam surface. In this paper, we have introduced half elliptical and full elliptical profile modification in the cantilever structure to improve and uniformly distribute the stress at the beam surface. Stress distribution characteristics of the modified cantilever beams were investigated and compared using finite element analysis. Based on the theoretical and finite element analysis, cantilever beams were fabricated using 3D print technology. Fabricated cantilever beams were then used to investigate the piezoelectric performances of polyvinylidene fluoride (PVDF) in composite of barium titanate (BaTiO3) nanoparticles in the form of electrospun composite nanofibers. FTIR analysis shows successful conversion of alpha phase to beta phase of PVDF and PVDF/BaTiO3 nanocomposites. During 6[Formula: see text]Hz cyclic actuating experiment, maximum voltage output of 0.15[Formula: see text]V and 1.5[Formula: see text]nA current output were observed. The concept was proposed to replace MEMS-based sensor in hand tremor quantification to assist Parkinson disease management.

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Zhou, Gongbo, Houlian Wang, Zhencai Zhu, Linghua Huang i Wei Li. "Performance Analysis of Wind-Induced Piezoelectric Vibration Bimorph Cantilever for Rotating Machinery". Shock and Vibration 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/216353.

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Harvesting the energy contained in the running environment of rotating machinery would be a good way to supplement energy to the wireless sensor. In this paper, we take piezoelectric bimorph cantilever beam with parallel connection mode as energy collector and analyze the factors which can influence the generation performance. First, a modal response theory model is built. Second, the static analysis, modal analysis, and piezoelectric harmonic response analysis of the wind-induced piezoelectric bimorph cantilever beam are given in detail. Finally, an experiment is also conducted. The results show that wind-induced piezoelectric bimorph cantilever beam has low resonant frequency and stable output under the first modal mode and can achieve the maximum output voltage under the resonant condition. The output voltage increases with the increase of the length and width of wind-induced piezoelectric bimorph cantilever beam, but the latter increasing amplitude is relatively smaller. In addition, the output voltage decreases with the increase of the thickness and the ratio of metal substrate to piezoelectric patches thickness. The experiment showed that the voltage amplitude generated by the piezoelectric bimorph cantilever beam can reach the value simulated in ANSYS, which is suitable for actual working conditions.

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Rozprawy doktorskie na temat "Cantilever beam experiment"

Mobasseri, Seyed Omid. "Developing a QFD-based design-integrated structural analysis methodology". Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7047.

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Design of the mechanical components greatly depends on their expected structural performances. In modern design applications these performances are quantified by computer-based analysis and occasionally confirmed by experimental measurements or theoretical calculations. The dependency of the mechanical product to the structural analysis process is more significant under the product’s multi-functionality aspect that requires analyses for a variety of Variable Input Parameters, to obtain various structural responses and against more than one failure or design criterion. Structural analysis is known as the expert field, which requires an upfront investment and facilitation to be implemented in commercial design environment. On the other hand, the product design process is a systematic and sequential activity that put the designer in the central role of decision making. Lack of mutual understanding between these two disciplines reduces the efficiency of the structural analysis for design. This research aims to develop an integrated methodology to embed the structural analysis in the design process. The proposed methodology in this research combines the benefits of state-of-the-art approaches, early simulation and Validation and Verification practice, towards the specified aim. Moreover the novelty of the proposed methodology is in creative implication of Quality Function Deployment method to include the product’s multi-functionality aspect. The QFD-Based Design Integrated Structural Analysis methodology produces a reliable platform to increase the efficiency of the structural analysis process for product design purpose. The application of this methodology is examined through an industrial case-study for the telescopic cantilever boom, as it appears in Access platforms, and Cranes products. Findings of the case-study create a reliable account for the structural performance in early stages of the design, and ensure the functionality of the proposed methodology.

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Abraham, Jeevan George. "A deflection, buckling and stress investigation into telescopic cantilever beams". Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7380.

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The telescoping cantilever beam structure is applied in many different engineering sectors to achieve weight/space optimisation for structural integrity. There has been limited theory and analysis in the public domain of the stresses and deflections involved when applying a load to such a structure. This thesis proposes (a) The Tip Reaction Model, which adapts classical mechanics to predict deflection of a two and a three section steel telescoping cantilever beam; (b) An equation to determine the Critical buckling loads for a given configuration of the two section steel telescoping cantilever beam assembly derived from first principles, in particular the energy methods; and finally (c) the derivation of a design optimization methodology, to tackle localised buckling induced by shear, torsion and a combination of both, in the individual, constituent, hollow rectangular beam sections of the telescopic assembly. Bending stress and shear stress is numerically calculated for the same structure whilst subjected to inline and offset loading. An FEA model of the structure is solved to verify the previous deflection, stress and buckling predictions made numerically. Finally an experimental setup is conducted where deflections and stresses are measured whilst a two section assembly is subjected to various loading and boundary conditions. The results between the predicted theory, FEA and experimental setup are compared and discussed. The overall conclusion is that there is good correlation between the three sets of data.

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Visner, John C. "Analytical and Experimental Analysis of the Large Deflection of a Cantilever Beam Subjected to a Constant, Concentrated Force, with a Constant Angle, Applied at the Free End". University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196090494.

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Plump, John Martin. "An experimental and theoretical analysis of active vibration damping of a cantilever beam using a distributed actuator". Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15039.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaves 50-52.
by John M. Plump.
M.S.

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Sharafi, Amir. "Development and Implementation of an Advanced Remotely Controlled Vibration Laboratory". Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11101.

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Term of remote-lab is certain types of laboratories which practical experiments are directedfrom a separate area by remote controller devices. This study is part of developing andupgrading advanced vibration remote laboratory. In the new remote lab, users have theability to measure the dynamic characteristics of the test object similar to the current existingremote lab. But in addition to current existing remote lab, they are capable to modifydynamic properties of the test object remotely by attaching vibration test instruments; such asa block of mass, spring-mass or non-linear spring. Doing several accurate experimental testsremotely on the test object are the toughest issues we faced as designers. In creating anddeveloping of this remote-lab, number of different approaches was adopted for producingwell-defined tests. Also, instead of implementing routine devices and techniques for regularvibration laboratories, the new prototypes were designed by finite elements method (FEM)and LABVIEW. For instance, the desirable test object, the attachment mechanism, usefulapplications, and proper software for managing via internet were prepared.

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Ullah, Farooq Kifayat. "New Generation of Vibration Experiments Remotely Controlled Over the Internet:Development of Labview based Spectrum Analyzer and Interface". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2509.

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This thesis is part of the on going work at BTH (Blekinge Technical University) to develop a remote lab for Sound and Vibration Experiments. The aim of this undertaking is to develop a Spectrum Analyzer that can simultaneously take inputs from 10 sensors and be able to measure the Power Spectral Density, Cross correlation, Frequency Response Functions (FRF) and coherence. The Interface and analysis algorithms are developed inLabview programming language. The thesis starts by introducing the overall aim of the project and its scope, the place of this particular thesis in the whole picture and the algorithms used for analysis are introduced. In the second part of the thesis the development of the software is explained and the main aim is to thoroughly document the software. This part of the thesis explains Labview programming concepts in detail to make it easier for other students who want to undertake theses to continue this work and who may not have experience of Labview programming.Two versions of the spectrum analyzer were developed. The third part explains theexperimental set up and results obtained and compares measurements to those obtained using other spectrum analyzers. An accurate Spectrum Analyzer Virtual Instrument has been developed and tested during this thesis project and it can be used as a component of the proposed Sound and vibration analysis laboratory and also for general Spectral Analysis tasks.
Good guide to learn Labview and sound and vibration analysis..
fkul08@gmail.com Is my email and i can be contacted via messenger usually at farooq_kifayat@hotmail.com And i can also be contacted via skype using farooqkifayat as my name. I move around a lot so i have no permanent address that stays longer than half a year .

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Ollier, Eric. "Micro commutateur opto-mécanique intègre sur substrat de silicium pour réseaux de fibres optiques". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0163.

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L'etude demontre la faisabilite d'un micro commutateur opto-mecanique a commande electrostatique, destine a la commutation spatiale dans les reseaux de fibres optiques (longueur d'onde: 1,3 m et 1,55 m). Ce commutateur a ete realise en combinant les techniques de l'optique integree et du micro-usinage sur silicium. Une etude theorique du circuit optique est conduite pour determiner les pertes optiques, l'isolation inter-voies et la sensibilite a la polarisation. Puis la deviation electrostatique de la poutre mecanique est modelisee et les sensibilites du composant aux vibrations, aux accelerations et a la temperature sont evaluees. Les contraintes residuelles dans la silice, a l'origine des deformations parasites des structures mecaniques, sont etudiees. Les comportements mecaniques sont relies aux phenomenes physiques regissant les contraintes intrinseques. Les solutions technologiques developpees pour controler les deformations parasites sont decrites: traitement thermique, systeme de compensation mecanique et bilame thermique. La caracterisation des composants debute par l'etude experimentale de la deviation mecanique des poutres par la commande electrostatique. Puis le fonctionnement optique des micro commutateurs est caracterise, en terme de pertes optiques fibre a fibre, d'isolation optique des voies de sortie, de sensibilite a la polarisation, de tension de commande et de temps de reponse. Enfin, un micro commutateur mettant en uvre un peigne electrostatique et un fonctionnement tirant parti du phenomene d'instabilite electrostatique du systeme est presente. Il a permis d'atteindre une faible tension de commande tout en conservant de bonnes performances optiques. Les meilleures performances obtenues sont suivantes, a 1300 nm: pertes fibre a fibre: -2. 5 db, isolation: 40 db, tension de commande: 28 v, temps de reponse: 0,8 ms

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Lin, Kun-Ying, i 林昆瑩. "Precision Position Control and Experiment Verification of a Piezoelectric Cantilever Beam". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/7uq5qr.

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碩士
中原大學
機械工程研究所
91
This study performs precision position control of the piezoelectric cantilever beam with consideration of nonlinearity. Two different dynamic models were obtained. The first one is derived in the forms of linear systems through application of basic physic laws of piezoelectric material, Hamilton’s principle and modeling technique of finite elements. The second one is established as in through experimentally-obtained frequency responses. With theoretical models in hand, the controllers aimed to perform precision positioning of the piezoelectric cantilever beam are next designed to work for a pickup actuator in optical disc drives, which ought to suppress the vibratory disturbance caused by the rotation of the disc. Two types of controllers, PI-and-lag-lead compensator and H∞ controller, are synthesized herein to perform the precision positioning due to the simple structure of the PI-and-lag-lead one and the robustness achieved by the H∞ one. Note that the H∞ controller designed herein would able to work against plant uncertainty, sensor noise and the extraneous disturbance caused by the eccentric rotation of the disk. Simulations are performed to validate the performance expected by previously-designed controllers. Finally, experiments are conducted to verify the effectiveness foreseen by simulations.

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Kulkarni, Raghavendra B. "Inverse problems solution using spectral finite element methods". Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5471.

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Inverse problems are very challenging as these problems involve, finding the cause by analyzing the effects. In structural dynamics problems, the effects are normally measured in terms of dynamic responses in structures. These responses which are used to find the cause generally have partial data, embedded with measurement noise, and are truncated. Due to these problems, inverse problems are generally ill-posed in most cases as against forward problems. In this dissertation, we solve five different types of inverse problems involving high-frequency transient loads. All these problems are solved using the time-domain spectral element method (TSFEM) along with experimental or numerically simulated responses. The dissertation starts with the formulation of the forward problem, which is obtaining the responses from known input forces. The general formulation of TSFEM of composite Timoshenko beam is derived. The isotropic beam formulation is shown as a special case in this formulation. Five different inverse problems solved in the thesis are: 1. Force identification problem: A new algorithm is developed using a 1-D waveguide, involving an eight noded spectral finite element. The force identification is carried out, using a few measured responses on the structure, and using TSFEM we reconstruct the input force. This is followed by a portal frame example to demonstrate the wave reflection complexities. New procedures are developed to use various types of response data like displacement, velocity, acceleration, and strain to identify the force. 2. Material identification problem: A new procedure making use of the developed TSFEM, few responses, and nonlinear least square techniques are used to determine the material properties. Also, we show the case, in which we derive the material properties without force input consideration. 3. Crack location detection problem: A new procedure is developed using TSFEM and mechanics of crack. Three methods are described, in which the first method uses only responses and wave speeds to determine the location of the crack. In the second method, force reconstruction using the measured responses is carried out and this, in turn, is used to determine the location of the crack. The third method uses the residues of the actual force and the reconstructed forces using the healthy beam matrices and cracked beam responses. A new procedure to identify the crack location using a general force input pulse having many frequency components is also developed. 4. Material defect identification: Material defects like voids or density changes are identified using TSFEM. Location and magnitude of defect are identified using response computation and using the method of residues. 5. Porous location and identification in a composite material: TSFEM is used to construct a porous element and this is used along with a healthy beam to generate the responses. A force reconstruction algorithm is used to identify the location of the porous element. The Force residue method to identify the location of the defect is also demonstrated. Further, we make use of the material identification algorithm with a few modifications to evaluate all the parameters for the porous element.

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Satpathy, Subhransu Mohan, i Praveen Dash. "Dynamic analysis of cantilever beam and its experimental validation". Thesis, 2014. http://ethesis.nitrkl.ac.in/6196/1/110ME0289-15.pdf.

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Beam is an inclined or horizontal structural member casing a distance among one or additional supports, and carrying vertical loads across (transverse to) its longitudinal axis, as a purlin, girder or rafter. In Euler – Bernoulli beam theory, shear deformations and rotation effects are neglected, and plane sections remain plane and normal to the longitudinal axis. In the Timoshenko beam theory, plane sections still remain plane but are no longer normal to the longitudinal axis. In this paper, we will be formulating the equations of motion of a free cantilever beam. The natural frequency of continuous beam system will be found out at different variables of beam using ANSYS 14.0. The results will be compared further using experimentation by free vibration of a cantilever beam. Using those results, we will be able to compare the parameters in Euler-Bernoulli and Timoshenko beam. Free vibration takes place when a system oscillates under the action of forces integral in the system itself due to initial deflection, and under the absence of externally applied forces. The system will vibrate at one or more of its natural frequencies, which are properties of the system dynamics, established by its stiffness and mass distribution. The comparative displacement alignment of the vibrating system for a particular natural frequency is known as the Eigen function in continuous system. The mode shape of the lowest natural frequency (i.e. the fundamental natural frequency) is termed as the fundamental (or the first) mode frequency. The displacements at some points may be zero which are called the nodal points. Generally nth mode has (n-1) nodes excluding the end points. The mode shape varies for different boundary conditions of a beam.

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Książki na temat "Cantilever beam experiment"

A, Hopkins Dale, i United States. National Aeronautics and Space Administration., red. Effects of delaminations on the damped dynamic characteristics of composite laminates: Mechanics and experiments. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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Experimental Measurement of the Mechanical Impedance of a Cantilever Beam. Creative Media Partners, LLC, 2021.

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Części książek na temat "Cantilever beam experiment"

Shah, A. J., i G. R. Vesmawala. "Experimental and Numerical Modal Analysis of Cantilever Beam". W Lecture Notes in Civil Engineering, 311–17. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8496-8_39.

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Kim, Myoung-Gu. "One-To-One Resonance Phenomenon on a Nonlinear Quadrangle Cantilever Beam". W Experimental Analysis of Nano and Engineering Materials and Structures, 165–66. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_81.

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Bibbo, Nimai Domenico, i Vikas Arora. "Damping Identification and Model Updating of Boundary Conditions for a Cantilever Beam". W Conference Proceedings of the Society for Experimental Mechanics Series, 139–48. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47630-4_13.

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Vizzaccaro, Alessandra, Sandor Beregi, David Barton i Simon Neild. "Hybrid Testing of a Cantilever Beam with Two Controlled Degrees of Freedom". W Conference Proceedings of the Society for Experimental Mechanics Series, 115–17. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04094-8_15.

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Moreu, Fernando, James Woodall i Arup Maji. "Understanding Errors from Multi-Input-Multi-Output (MIMO) Testing of a Cantilever Beam". W Conference Proceedings of the Society for Experimental Mechanics Series, 147–52. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77143-0_15.

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Raghuraman, M., i I. Ramu. "Experimental Investigation for Finding Defects on Epoxy-Coated Cantilever Beam Using Optical Method". W Lecture Notes in Mechanical Engineering, 331–38. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2696-1_32.

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Debeurre, Marielle, Aurélien Grolet, Pierre-Olivier Mattei, Bruno Cochelin i Olivier Thomas. "Nonlinear Modes of Cantilever Beams at Extreme Amplitudes: Numerical Computation and Experiments". W Nonlinear Structures & Systems, Volume 1, 245–48. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04086-3_35.

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Kim, Myoung Gu, Chong Du Cho, Chang Boo Kim i Ho Joon Cho. "Nonplanar Nonlinear Vibration Phenomenon on the One to One Internal Resonance of the Circular Cantilever Beam". W Experimental Mechanics in Nano and Biotechnology, 1641–44. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1641.

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Alazar, Tsgereda, Santosh Sankarasubramanian, Sivakumar Yagnamurthy, Kyle Yazzie, Pilin Liu i Pramod Malatkar. "Symmetric and Asymmetric Double Cantilever Beam Methods for Interfacial Adhesion Strength Measurement in Electronic Packaging". W Conference Proceedings of the Society for Experimental Mechanics Series, 155–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22449-7_19.

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Geßner, Felix, Matthias Weigold i Eberhard Abele. "Investigation on Tool Deflection During Tapping". W Lecture Notes in Mechanical Engineering, 104–14. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_10.

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AbstractTapping is a challenging process at the end of the value chain. Hence, tool failure is associated with rejected components or expensive rework. For modelling the tapping process we choose a mechanistic approach. In the present work, we focus on the tool model, which describes the deflection and inclination of the tool as a result of the radial forces during tapping. Since radial forces always occur during tapping due to the uneven load distribution on the individual teeth, the tool model represents an essential part of the entire closed-loop model. Especially in the entry phase of the tap, when the guidance within the already cut thread is not yet given, radial forces can lead to deflection of the tool. Therefore, the effects of geometric uncertainty in the thread geometry are experimentally investigated, using optical surface measurement to evaluate the position of the thread relative to the pre-drilled bore. Based on the findings, the tool deflection during tapping is mapped using a cylindrical cantilever beam model, which is calibrated using experimental data. The model is then validated and the implementation within an existing model framework is described.

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Streszczenia konferencji na temat "Cantilever beam experiment"

Lee, Heon J., Young-Soo Chang, Ho-Young Kim, Jong-Seob Ahn i Yoon-Pyo Lee. "Experiment of Micro Cantilever Deflection by Thermal Bubble Growth in Liquid". W ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72486.

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Micro cantilevers are significant structure for MEMS devices, such as bio-chips, sensors and STEM/AFM probes. The beam deflection and its characteristics have been studied for various purposes. In this study, expending bubbles from thermal surface exert force on micro-cantilever beam and causes deflection of the beam. Cantilevers were fabricated by classic MEMS fabrication method; photolithography and dry etching. The micro-beam was fabricated from <100> n-type silicon wafer and its thickness varies from 10 micron to 30micron with various geometry (length, width and tip shapes). The distance from thermal surface and cantilever beam is also significant variables for analysis of bubble-beam interaction. We observed beam deflection with respect to various bubble generation conditions (bubble size, contact area and generating frequency). Simple analysis of bubble-beam interaction were performed and compared with experimental results.

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Chigullapalli, Aarti, i Jason V. Clark. "Modeling the Thermomechanical Interaction Between an Atomic Force Microscope Cantilever and Laser Light". W ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89215.

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In this paper, we present the first computational model of the thermomechanical interaction between an atomic force microscope (AFM) cantilever and laser light. We validate simulation with experiment. Design parameters of our model include AFM laser power, laser spot position, and geometric and material properties of the cantilever. In the area of nanotechnology, the laser beam deflection method has been widely used in AFMs for detecting the cantilever’s deflection and resonance frequency. The laser deflection method consists of reflecting a laser beam off of an AFM cantilever onto a photo diode, which is converted to a voltage signal. Deflection of the cantilever results in a change in the laser reflection angle and a change in voltage signal. The mechanical properties of the cantilever affect the amount of deflection. Although much work has been done on increasing the sensitivity of the AFM, little work has been done on investigating the thermal effect of the laser-cantilever interaction. We observe that laser-induced thermal expansions in the AFM cantilever are measureable. Our simulated results suggest that both the laser power and spot positions significantly change the resonant response of the cantilevers. The resonance response is critical for the AFM tapping mode. In considering various laser powers, we observe that as we increase the power, the average temperature of the beam increases, which causes a decrease in resonance frequency. In considering various laser reflection spot positions, we find that as the laser spot moves away from the clamped end of the cantilever, the dissipation to the sample which is 6 m below the cantilever tip decreases, causing an increase in temperature but decrease in material softening. The results of our models are close to the experimental results with a relative error of 0.1%.

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Lu, F., X. J. Wang i Y. F. Liu. "Experimental Research on Deflection Control of Cantilever Beam Based on Hybrid Photovoltaic/Piezoelectric Actuation Mechanism". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65629.

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When ultraviolet light illuminates on polarized PLZT ceramic, a large voltage can be generated between the electrodes due to the anomalous photovoltaic effect. The shape control of flexible shell can be realized by using hybrid photovoltaic/piezoelectric actuation. In this paper, a novel non-contact deflection closed-loop control model of cantilever beam based on hybrid photovoltaic/piezoelectric actuation can be proposed. The photovoltage of PLZT ceramic irradiated by ultraviolet light is applied to drive PVDF actuator. The closed-loop control equations of deflection of cantilever beam is derived based on the mathematical model of PLZT ceramic with coupled multi-physics fields and the constitutive model of cantilever beam. Then, parameters of deflection control equations of cantilever beam during illumination phase and light off phase are identified through the deflection static experiment. After that, the deflection closed-loop control experiment of cantilever beam based on hybrid photovoltaic/piezoelectric actuation mechanism is carried out to verify the control model. The experimental results show that the deflection of cantilever beam with a simple on-off control method can achieve the target value by applying UV light to PLZT ceramic. It also should be noted that, the deflection curve of cantilever beam illuminated by strong UV light has an undesirable fluctuation.

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Yang, Rui, Xiaobin Li i Hongxi Li. "Experimental Research on Vibration Characteristics of Laminated Composite Cantilever Beam". W ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-63227.

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Abstract In this paper, the vibration characteristics of laminated composite cantilever beam is taken as the research object. Firstly, a vibration formula specific for laminated composite cantilever beam is derived, from which the low order natural frequency of laminated composite cantilever beam is calculated; Secondly, two experimental methods, electrical and optical measurement, are used to study the vibration characteristics of laminated composite cantilever beam, and the influence of different test methods, sensor types, number of measuring points and excitation methods on the test results are analyzed. Through the combination of theory and experiment, a test method that can be applied to the vibration test of composite material laminated structure cantilever beam is obtained. Based on the laser vibration measurement method in the optical method, the results show that the deviation between the experimental data and the theoretical solution is the smallest when the distance between the probe and the specimen is 0.5m and the sampling time is 5s by using the optical fiber vibrometer. The research content of this article can provide a reasonable reference for related vibration test research.

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Eremin, Mikhail O., i Evgenii E. Deryugin. "Deformation and failure of double cantilever beam subjected to wedging experiment and numerical simulation". W PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083320.

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Shen, Sheng, Avind Narayanaswamy, Shireen Goh i Gang Chen. "Thermal Conductance of Bi-Material AFM Cantilevers". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68078.

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In this letter, based on the beam theory and the thermal analysis of a bi-material cantilever, we demonstrate that the effective thermal conductance of the cantilever and the temperature at the tip of the cantilever can be determined by measuring the bending of the cantilever in response to two different thermal inputs: power absorbed at the tip and ambient temperature. The bi-material cantilevers were first introduced as a calorimeter to measure the heat generated in chemical reactions. [1] The same device was demonstrated to be sensitive enough to measure power as small as 100 pW or energy of 150 fJ in photothermal measurements. [2] They were also used as IR detectors [3, 4, 5] or as scanning thermal imaging probes. [6] Although the bi-material cantilevers are often used as temperature or heat flux sensors based on the beam bending due to the unequal thermal expansion of the two materials, the exact temperature at the tip of the cantilever is usually unknown. Directly measuring the temperature is difficult due to the small geometry of the cantilever structure. To find out the temperature of the cantilever, one should obtain the thermal conductance of the cantilever. However, since the thermal properties of two layers of the cantilever are dependent on their thickness, one cannot rely on theoretical calculation. In this letter, we develop a technique to determine the thermal conductance of the cantilever by measuring the bending of the cantilever in response to the variations of the absorbed power at the tip and the ambient temperature. A triangular silicon nitride cantilever coated with 70 nm gold film is used in the current experiment. As shown in Fig.1 (a), a semiconductor laser beam is focused on the tip of the cantilever and reflected onto a position sensing detector (PSD). The deflection of the reflected laser beam spot on the PSD is used as a measure of the deflection of the cantilever. A part of the laser power is absorbed by the cantilever and thus creates a temperature rise at the end of the cantilever. The output of the PSD is converted into an X or Y signal corresponding to the position of the laser spot on the PSD and a sum signal proportional to the incident laser power.

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Hassanpour, Pezhman A., i Andrea J. Helmns. "Low Cost Experimental Vibration Analysis of a Cantilever Beam Under Base Excitation". W ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38562.

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This paper presents the investigation of operational deflection shapes of vibration of a cantilever beam using a low-cost digital video camera, and by application of image processing techniques. The beam is uniform and under base excitation. The analytical model of the system is developed using dimensionless formulation. The analytical ODS’s are derived, and then compared with those found from experiment. The significance of this research is that it provides the researchers an inexpensive alternative tool for investigating the behavior of systems with low-frequency dynamics.

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Kwon, Kye-Si, i Rong-Ming Lin. "Application of Taguchi Method to Identify Damage in Cantilever Beam". W ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48610.

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A robust damage identification technique is presented such that the location and severity of damages can be identified in presence of random errors in measured data as well as systematic errors in analytical model. In order to identify damage efficiently, the concept of design of experiment using orthogonal array is used for screening main effects of each parameter which corresponds to possible damage location in FE model. Then, Taguchi method, which has been widely used for robust design in industry, is applied to the optimization of the objective function, which is defined by the difference between measured and analytical modal data, by updating the parameters in analytical FE model in an iterative way. The numerical simulation of cantilever beam shows that various types of damages can be identified effectively with reasonable accuracy.

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Elahi, Mirza M., Mohammadhosein Ghasemi Baboly i Zayd C. Leseman. "1-D Thermoreflectance Measurement Technique for Freestanding Micro/Nano Cantilever Beams". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67377.

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Pump-probe thermoreflectance is a well-known non-contact optical measurement technique for thermal property analysis of thin film materials on a semi-infinite substrate. Two laser lines are commonly used, one of which is used to heat the structure (the pump) and the other is used to measure the change in reflectivity (the probe) to infer thermal properties of the material/structure. This work extends the technique to freestanding cantilever beams. The pump beam applies a constant flux to the free end of the cantilever thereby inducing a thermal gradient along its length which is measured by the probe beam. Measurement of the thermal gradient allows for determination of the thermal conductivity of the material. Convective and radiative heat losses are minimized by performing the experiment at high vacuum and removing the substrate underneath the beam. We demonstrate the technique by measuring the thermal conductivity for four Si cantilever beams that are 1.29 μm thick. The average thermal conductivity for the beams was measured to be 96.9 ± 1.76 Wm−1K−1.

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Arai, Yasuhiko, Shunsuke Yokozeki, Seiji Aoyagi i Atsunobu Mori. "The Dynamic Characteristics of MEMS Driven by Laser Beam". W ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41117.

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When we drive a micro machine actually, it is very important to supply energy to the micro machine smoothly. The technology that can supply the energy to micro machines by optical beam is discussed. It has been confirmed that the micro cantilever was deformed by the laser beam that was used for the measurement in previous paper. In this paper, this problem is used positively as the new technology that can supply the energy to microstructures. In the experiment, the micro cantilever is driven by the beam of a semiconductor laser that is modulated by a sinusoidal electronic signal. The frequency response of the micro cantilever that is driven by the laser beam is detected. It is confirmed that the resonance curve of the micro cantilever in vacuum shows clearly the property of the mechanical vibration. Such problems and mechanical characteristics of microstructures that are driven by the laser beam are discussed.

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Raporty organizacyjne na temat "Cantilever beam experiment"

EXPERIMENTAL STUDY AND NUMERICAL ANALYSIS ON SEISMIC BEHAVIOR OF ASSEMBLED BEAM-COLUMN JOINTS WITH CSHAPED CANTILEVER SECTION (ID NUMBER: 197). The Hong Kong Institute of Steel Construction, sierpień 2022. http://dx.doi.org/10.18057/icass2020.p.197.

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"A kind of assembled steel beam-column joint with C-shaped cantilever section was proposed. The influences of the lengths of cantilever sections and cover plates on seismic performance of the joints were discussed through low-cycle reciprocating loading tests and numerical simulations. Then the sensitivity analysis of key parameters such as thickness and width of flange plate ,bolt number and cover plate’s length were carried out. The results show that the joint consumed energy through warping deformations of end plate and the friction slippages between flange of beam, C-shaped cantilever section and cover plate. By reasonably increasing the lengths of C-shaped cantilevers section and cover plates, it can ensure that the joints have high bearing capacities, while significantly improving energy dissipation capacities of the joints. Parameter analysis showed that increasing thickness of the flange plate can effectively improve the stress concentration at root of the cantilever section. Reducing width of flange plate has a great impact on bearing capacity and initial stiffness of the joint with the maximum drop amplitude of 13.1% and 18.9%, respectively."

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