Artykuły w czasopismach: „Cantilever beam experiment”

1

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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Li, Yuejuan, Xulei Hou, Wei Qi, Qiubo Wang i Xiaolu Zhang. "Modeling and Analysis of Multiple Attached Masses Tuning a Piezoelectric Cantilever Beam Resonant Frequency". Shock and Vibration 2020 (26.10.2020): 1–12. http://dx.doi.org/10.1155/2020/6971983.

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Mechanical vibrations have been an important sustainable energy source, and piezoelectric cantilevers operating at the resonant frequency are regarded as one of the effective mechanisms for converting vibration energy to electricity. This paper focuses on model and experimental investigations of multiple attached masses on tuning a piezoelectric cantilever resonant frequency. A discrete model is developed to estimate the resonant frequencies’ change of a cantilever caused by multiple masses’ distribution on it. A mechanism consisted of a piezoelectric cantilever with a 0.3 g and a 0.6 g movable mass along it, respectively, is used to verify the accuracy of the proposed model experimentally. And another mechanism including a piezoelectric cantilever with two 0.3 g attached masses on it is also measured in the designed experiment to verify the discrete model. Meanwhile, the results from the second mechanism were compared with the results from the first one in which the single attached mass is 0.6 g. Two mechanisms have wildly different frequency bandwidths and sensitivities although the total weight of attached masses is the same, 0.6 g. The model and experimental results showed that frequency bandwidth and sensitivity of a piezoelectric cantilever beam can be adjusted effectively by changing the weight, location, and quantity of attached masses.

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Cheng, Jianming, Huanlang Lu, Fumin Xie i Pingyu Zhu. "Structural Deformation Reconstruction of Polymer Distributed Optical Fiber Sensing Tape Based on Ko Theory". Journal of Physics: Conference Series 2366, nr 1 (1.11.2022): 012016. http://dx.doi.org/10.1088/1742-6596/2366/1/012016.

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Abstract The progress of material technology makes the structural deformation of composites more complex and more difficult to monitor. The distributed optical fiber sensor has a wide monitoring range and can continuously obtain the strain data of the structure in space for structural deformation reconstruction. In this paper, the optical frequency domain reflectometer (OFDR) and distributed optical fiber sensor are used as measurement tools to design the deformation reconstruction experiment of a cantilever beam with constant cross section. Based on the Ko theory, the strain signals collected by the distributed optical fiber sensors are converted into displacement signals, and the deformation reconstruction of the cantilever beam is carried out, and then compared and analyzed with the actual measured values. The experiment verifies the effectiveness of using distributed fiber optic sensors for cantilever beam bending deformation based on Ko theory, which provides a favorable reference for structural health monitoring.

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Liu, Hai Peng, Shi Qiao Gao i Lei Jin. "Study on the Energy Harvesting Performance of PE Cantilever Beam". Key Engineering Materials 645-646 (maj 2015): 1189–94. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.1189.

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Harvesting ambient vibration energy through piezoelectric (PE) means is a popular energy harvesting technique. The merit of applying PE means to supply energy for microelectronic devices is that they can reduce the battery weight and possibly make the device self-powered by harvesting mechanical energy. This investigation will examine the energy generating performance of miniature PE cantilever beam through theoretical modeling, simulation and experiment testing. Through the theoretical analysis of the piezoelectric energy harvesting structure, the expression of open circuit voltage output is obtained. Using ANSYS software, the working performance of piezoelectric cantilever beam is analyzed. On the basis of theoretical analysis and simulation optimization, a set of experimental system is established to test the energy harvesting performance of the piezoelectric cantilever beam. The testing result shows that the harvested energy by the piezoelectric cantilever beam could supply electrical power to some micro electrical devices.

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Yin, Yan-Qi, Bo Zhang, Yue-ming Li i Wei-Zhen Lu. "Effect of Dead Load on Dynamic Characteristics of Rotating Timoshenko Beams". Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/582192.

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The dynamic characteristics of a rotating cantilever Timoshenko beam under dead load are investigated in this paper. Considering the predeformation caused by dead load and centrifugal force, governing equation of rotating cantilever Timoshenko beam is derived based on Hamilton’s principle, and the influence of the load on natural vibration is revealed. A suit of modal experimental apparatus for cantilever beam is designed and used to test the natural frequencies under the dead load, and the natural frequencies under rotation condition are calculated with a commercial finite element code. Both the experimental result and numerical result are utilized to compare with the present theoretical result, and the results obtained by present modeling method show a good agreement with those obtained from the experiment and finite element method. It is found that the natural frequencies of cantilever beam increase with both the dead load and the rotating speed.

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LI Yao-bin, 李耀彬, 于化东 YU Hua-dong, 王强龙 WANG Qiang-long, 宋. 阳. SONG Yang, 伞晓刚 SAN Xiao-gang i 刘震宇 LIU Zhen-yu. "Super-harmonic resonance experiment about bolt connected cantilever beam". Optics and Precision Engineering 25, nr 3 (2017): 720–28. http://dx.doi.org/10.3788/ope.20172503.0720.

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Yeh, M. K., i L. B. Fang. "Contact analysis and experiment of delaminated cantilever composite beam". Composites Part B: Engineering 30, nr 4 (czerwiec 1999): 407–14. http://dx.doi.org/10.1016/s1359-8368(99)00008-6.

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Zhang, Mingming, Pan Kong, Anping Hou i Yuru Xu. "Fractal Analysis of Local Activity and Chaotic Motion in Nonlinear Nonplanar Vibrations for Cantilever Beams". Fractal and Fractional 6, nr 4 (24.03.2022): 181. http://dx.doi.org/10.3390/fractalfract6040181.

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Many problems in practical engineering can be simplified as the cantilever beam model, which is generally studied by theoretical analysis, experiment, and numerical simulation. This paper discusses the local activity of the nonlinear nonplanar motion of a cantilever beam at the equilibrium point. Firstly, the equilibrium point of the model and the Jacobian matrix have been calculated. The stability of the characteristic root corresponding to the characteristic polynomial has been analyzed. Secondly, the corresponding complexity function of the model at the equilibrium point has been given. Then, the local activity region of the model at the equilibrium point can be obtained by using the theory of the local activity. Based on the actual engineering research background, the damping coefficient is generally taken as 0 < c < 1. The cantilever beam model is the local activity at the equilibrium point only if the parameters of the model satisfy a certain condition. In the numerical simulation, it is found that when the proper parameters are selected in the local activity region, the cantilever beam can exhibit different types of chaotic motion. The local activity theory provides a theoretical basis for the parameter selection of the chaotic motion in the cantilever beam.

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Quanguo, Lu, i Zeng Bin. "Modeling and Experiment of Terfenol-d Driven Composite Cantilever Beam". Information Technology Journal 12, nr 23 (15.11.2013): 7626–30. http://dx.doi.org/10.3923/itj.2013.7626.7630.

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Yu, Qiong, Zhou Dao Lu, Jiang Tao Yu, Xing Zhuang Zhao i Jin Dai. "Experimental Study on Specimens of Steel Secondary Beam Embedded in Reinforced Concrete Girder of Frame Structure". Advanced Materials Research 243-249 (maj 2011): 1072–84. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.1072.

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Test of two specimens (four different joints) of steel secondary beam embedded in reinforced concrete girder in frame structure and one specimen with steel cantilever beam embedded in reinforced concrete girder under static load were conducted. The steel beam up-flange was pulled out because of the concrete cracks caused by the moment, shear and torsion at the upper zone of the concrete beam near the steel beam end. Shear failure of the concrete beam and the top flange pullout failure are the most hazardous failure modes. Lacking restraint of concrete and the reinforcement of steel bar in the concrete slab and catenary action of restraint steel beam, the capacity of steel cantilever beam is much smaller than other beams. Load-slip curve of top flange of steel beam, load-rotation curve of the steel beam end are obtained through experiment. Primary calculation method of joints flexural capacity related to section size of composite steel beam, embedded depth of steel beam, flange width of steel beam embedded end, height of frame girder, is put up with. Analytical results of ABAQUS are shown as follows. Top flange pullout failure of steel beam is caused by the detachment of concrete and steel beam end, and the warp of the concrete slab near the support plays an unfavorable action on the performance of the steel beam. The end rotational angle of the steel beam with anchor bar is smaller than that without. The steel beam with shear connectors develops a smaller rotational angle and a higher load capacity.

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Nguyen, Quoc Chi, Nguyen Tri Giang Vu i Phuong Tung Pham. "Input shaping control of a flexible cantilever beam excited by a moving hub". Science & Technology Development Journal - Engineering and Technology 3, nr 2 (16.08.2020): First. http://dx.doi.org/10.32508/stdjet.v3i2.605.

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Introduction: A cantilever beam is a well-known structural element in engineering, which is only fixed at one end. This structure can be used to describe a manipulator, whose stiffness is large to ensure rigidity and stability of the system. A flexible cantilever beam provides a light-weight structure and high cost efficiency but generates vibration under high-speed positioning. In this paper, we aim to control the vibratory behavior of a flexible cantilever beam attached to a moving hub. Method: The mathematical model of the flexible beam is described by partial differential equations (PDEs) using Euler-Bernoulli beam theory. Then, The PDE model is approximated by using the Galerkin method, which is resulted in a set of ordinary differential equations (ODEs). Experiment is used to determine unknown parameters of the system to complete the model. The ODE model enables the control design of three input shapers: (i) Zero-Vibration (ZV), (ii) Zero-Vibration-Derivative (ZVD), and (iii) Zero-Vibration-Derivative-Derivative (ZVDD), which are employed to drive the flexible beam to the desired position and to reduce vibrations of the beam. Results and conclusion: The dynamic model is obtained in term of ordinary differential equations. Unknown parameters of the system are determined by experimental process. Various controllers are designed to eliminate the vibration of the beam. The simulation is applied to predict the dynamic response of the beam to verify the designed controllers numerically. Experiment shows the validity of the mathematical model through the consistency between the simulation and experimental data and the effectiveness of the controllers for the real system. These controllers show several advantages such as no need of extra equipment; the positioning controller is intact, which means it may be applied to many existing systems.

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Wu, You, Liang Cai Xiong, Quan Sheng Zhou i Jun Chao Xia. "Experiment and Simulation of a Laser Shock Wave Driven Cantilever Beam". Advanced Materials Research 569 (wrzesień 2012): 491–94. http://dx.doi.org/10.4028/www.scientific.net/amr.569.491.

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A new driven pattern is proposed in this paper, which is based on laser shock wave and outstand in high energy efficiency, remote control, wireless and directionality. We describe the working principle of the laser shock wave driven pattern in detail. Furthermore, by a copper irradiated cantilever beam, the vibration state driven in different laser conditions is investigated with simulation and experiment, corresponding numeral analysis is performed to assess the driven effect.

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Budzik, Michal K., i Henrik M. Jensen. "Evaluation of Defects in Adhesive Joint by Double Cantilever Beam Experiment". Key Engineering Materials 665 (wrzesień 2015): 101–4. http://dx.doi.org/10.4028/www.scientific.net/kem.665.101.

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We analyzed effects of interface/adhesive defects during fracture mechanical Mode I Double Cantilever Beam (DCB) tests of an adhesive joint. Two aluminium slabs were bonded using structural epoxy adhesive. A DCB experiment under static loading was conducted to estimate the critical fracture energy. During the ‘steady-state’ fracture we noted oscillating, random fluctuation in the force vs. displacement curve, and thus in the fracture energy. This is associated to the local variation of properties within the bondline and the interfaces. A simple model is derived to quantify the probable density of flaws observed experimentally.

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Hao, Guannan, Xiangwei Dong, Zengliang Li i Xiaoxiao Liu. "Dynamic Response of PVDF Cantilever Due to Droplet Impact Using an Electromechanical Model". Sensors 20, nr 20 (12.10.2020): 5764. http://dx.doi.org/10.3390/s20205764.

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The dynamic response of a polyvinylidene fluoride (PVDF) cantilever beam under excitation of water droplet impact is investigated by developing an electromechanical model. In the model, the governing equations of beam motion and output voltage are derived in the theoretical way, such that the voltage across the PVDF layer and the cantilever deflection can be predicted. The motion of the beam is described by the multi-mode vibration model through which more accurate results can be obtained. The predicted results of the model are validated by the experiment. Combined with the experiment and the model, the effect of surface wettability on droplet-substrate interaction mechanisms is investigated, which provides an insight into the improvement of mechanical-to-electrical energy conversion efficiency in raindrop energy harvesting (REH) applications. Results show: (1) the droplet splash on a super-hydrophobic beam surface has a positive effect on voltage generation. The splash limit that affects the reaction force of the impacting droplet is experimentally determined and greatly dominant by the Weber number. (2) Small-scaled droplets in splash regime allow generating higher voltage output from a super-hydrophobic beam surface than from an untreated hydrophilic beam surface. (3) Tests of successive droplet impacts also show that a super-hydrophobic surface performs better over a hydrophilic surface by producing constant peak voltage and higher electrical energy harvested. In this case, the voltage measured from the hydrophilic surface decreases gradually as the water layer is accumulated. Overall, the electromechanical behaviors of a super-hydrophobic PVDF cantilever sensor can be well predicted by the model which shows a great potential in energy harvesting by maximizing the inelastic collision upon droplet-substrate interactions.

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Castello, Daniel A., i Fernando A. Rochinha. "An Experimental Assessment of Transverse Adaptive Fir Filters as Applied to Vibrating Structures Identification". Shock and Vibration 12, nr 3 (2005): 197–216. http://dx.doi.org/10.1155/2005/917832.

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The present work is aimed at assessing the performance of adaptive Finite Impulse Response (FIR) filters on the identification of vibrating structures. Four adaptive algorithms were used: Least Mean Squares (LMS), Normalized Least Mean Squares (NLMS), Transform-Domain Least Mean Squares (TD–LMS) and Set-Membership Binormalized Data-ReusingLMSAlgorithm (SM–BNDRLMS). The capability of these filters to perform the identification of vibrating structures is shown on real experiments. The first experiment consists of an aluminum cantilever beam containing piezoelectric sensors and actuators and the second one is a steel pinned-pinned beam instrumented with accelerometers and an electromechanical shaker.

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Li, Lei, Xiao Feng Zhao, Yang Yu, Dian Zhong Wen, Jing Ya Cao i Lei Tian. "Fabrication and Characteristics of Silicon Bridge Magnetic Sensor Based on Cantilever Beam". Key Engineering Materials 609-610 (kwiecień 2014): 1088–93. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.1088.

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A silicon bridge magnetic sensor based on cantilever beam is presented in this paper. Thesensor is composed of the Wheatstone bridge that made up of nano-polysilicon thin-film transistors(TFTs) and a ferromagnetic magnet adhered to the free end of cantilever beam. Through building thesimulation model, the finite element analysis of the sensor is carried out by using ANSYS software.The results show that this sensor can realize the measurement to the external magnetic field. Accordingto the simulation results, fabrication and packaging of the sensor chip are achieved by using the microelectromechanical system (MEMS) technology. Experiment result shows that when the supply voltageis 3.0 V, the sensitivity of the sensor is 94 mV/T.

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Weihua, Z., Z. Ning i M. Bingrong. "A new method to deduce the stress in a catenary support structure based on novel hybrid simulation". Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 223, nr 5 (5.06.2009): 495–504. http://dx.doi.org/10.1243/09544097jrrt255.

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Based on a stress investigation of structural failures of the railway system in China, a new method to determine the stress is put forward to overcome the deficiency of conventional simulation and experiment methods. Through numerical simulation, the inference relation of the stress between various locations is obtained. Then, by experiment, some stresses in the whole structure are measured. Accordingly, other stresses are determined through the inference relation. Furthermore, all the stresses in the structure are obtained and the strength evaluation can be exactly carried out. Taking the cantilever beam and the cantilever device supporting the catenary for example, how to deduce the stress by this method is discussed.

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Chen, Li Hua, Jian Wei Duan, Yue Sun i Jing Li. "The Study of the Vibration Characteristics of the Cantilever Beam with a Surface Crack". Applied Mechanics and Materials 394 (wrzesień 2013): 121–27. http://dx.doi.org/10.4028/www.scientific.net/amm.394.121.

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In this paper, the physical model of the cantilever beam with a surface crack is established to study the free vibration of the cracked beam from three aspects that are theoretical analysis, FEM analysis, and experiment. At the same time, the relation between the crack parameter and the vibration characteristics, which are natural frequencies and the modes of each order, is obtained through analysis. The theoretical analysis is on the basis of the mode analysis theory and applied mechanics. The crack is regarded as a flexible hinge. Utilizing the external boundary conditions and internal boundary conditions at the crack, the free vibration characteristics are obtained combining with the vibration mechanics. With the ANSYS software, a finite element model of the cracked beam is established by the beam element. During the process of calculation, it calculates the natural frequencies and the modes of cracked beam with different parameters of crack. The results obtained from the experiment are in agreement with the results obtained from the theoretical and the FEM analysis. So the accuracy of the theoretical analysis and the numerical simulation is verified by the experiment. At last, the effects of the crack location and depth on the natural frequencies and modes of each order are shown, and it could provide the theoretical, numerical and experimental basis for the identification of cracked materials and the relevant study.

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Fenglin, Yao, Meng Wengjun, Zhao Jie i Yin hang. "Study on the Simulation and Experiment of Cantilever Beam Piezoelectric Energy Harvester". International Journal of Multimedia and Ubiquitous Engineering 9, nr 9 (30.09.2016): 67–82. http://dx.doi.org/10.14257/ijmue.2016.11.9.08.

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Wu, Qiong, Hairui Zhang, Jie Lian, Wei Zhao, Shijie Zhou i Xilu Zhao. "Experiment Investigation of Bistable Vibration Energy Harvesting with Random Wave Environment". Applied Sciences 11, nr 9 (25.04.2021): 3868. http://dx.doi.org/10.3390/app11093868.

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The energy harvested from the renewable energy has been attracting a great potential as a source of electricity for many years; however, several challenges still exist limiting output performance, such as the package and low frequency of the wave. Here, this paper proposed a bistable vibration system for harvesting low-frequency renewable energy, the bistable vibration model consisting of an inverted cantilever beam with a mass block at the tip in a random wave environment and also develop a vibration energy harvesting system with a piezoelectric element attached to the surface of a cantilever beam. The experiment was carried out by simulating the random wave environment using the experimental equipment. The experiment result showed a mass block’s response vibration was indeed changed from a single stable vibration to a bistable oscillation when a random wave signal and a periodic signal were co-excited. It was shown that stochastic resonance phenomena can be activated reliably using the proposed bistable motion system, and, correspondingly, large-scale bistable responses can be generated to realize effective amplitude enlargement after input signals are received. Furthermore, as an important design factor, the influence of periodic excitation signals on the large-scale bistable motion activity was carefully discussed, and a solid foundation was laid for further practical energy harvesting applications.

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Nowak, Radosław, i Marek Pietrzakowski. "Experimental and Simulation Investigations of the Cantilever Beam Energy Harvester". Solid State Phenomena 248 (marzec 2016): 249–55. http://dx.doi.org/10.4028/www.scientific.net/ssp.248.249.

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Machines, cars suspensions, buildings steel constructions etc. usually generate vibrations, which can be the excitement signal for piezoelectric energy harvesters. The piezoelectric patches attached to the vibrating construction have ability to convert mechanical energy of harmful vibrations into electrical energy.The goal of the study was to verify a finite element model of the piezoelectric beam energy harvester by comparing results of numerical simulations with those obtained experimentally. The stand used in the experiment consists of the cantilever beam with piezoelectric elements attached, which is excited by the base harmonic movement. The transverse displacements of the selected beam’s point and the base, and also the frequency of vibrations were observed and measured using an accelerometer and a B&K Pulse platform. A portable data acquisition module was used to quantify the voltage generated by the piezoelectric layers.The finite element model was built in ANSYS software. The beam and piezoelectric layers were modeled by twenty node elements with an additional electric degree of freedom for piezoelectric elements. A full piezoelectric matrix was used in the finite element analysis instead of a one-dimensional piezoelectric effect, which dominates in many analytical approaches. It allowed building a more accurate model of the system. The experimental tests and finite element method simulations were performed and acquired results were compared. The characteristics of voltage amplitude in the time and frequency domain were shown and discussed.

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Appert, Aymeric, Christophe Gautrelet, Leila Khalij i Renata Troian. "Development of a test bench for vibratory fatigue experiments of a cantilever beam with an electrodynamic shaker". MATEC Web of Conferences 165 (2018): 10007. http://dx.doi.org/10.1051/matecconf/201816510007.

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When fatigue tests are carried out using a shaker, dynamic phenomena often appear and lead to a non-linear behaviour in the experiment. In this paper, the dynamic response of the specimen is studied in order to evaluate the impact on the results. The experiment consists in a notched beam fixed on the armature of an electro-dynamic shaker. The transfer function between the center of the armature and the tip of the beam is obtained with a swept sine near the first resonance frequency of the specimen. The drive is a constant acceleration amplitude. An evolution in the transfer function of the beam is observed when the drive is modified: the resonance frequency decreases and the damping increases. This non-linearity is investigated by studying the movement of the shaker, the fixture and the beam. The results show that the beam close to its resonance disrupt the imposed movement. An experimental setup correcting those defects is proposed.

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Shen, Fan, Li Zhao, Qin Zhang, Chuanfu Xin, Ying Gong, Yan Peng i Zhongjie Li. "A Hybrid Energy Harvester Based on Piezoelectric and Electromagnetic mechanisms". Journal of Physics: Conference Series 2418, nr 1 (1.02.2023): 012067. http://dx.doi.org/10.1088/1742-6596/2418/1/012067.

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Abstract This paper presents a hybridization energy harvester (HEH) based on a two degrees-of-freedom (2-DOF) cantilever beam, which combines the electromagnetic effect with the piezoelectric effect. Finite element simulations and some experiments were used to investigate the output of the HEH. For the electromagnetic energy harvester (EMEH), we used an alternating-arranged magnet array to get high electromotive forces. The frequency sweep experiment showed that the resonance frequency of the cantilever beam was about 26.7 Hz which is close to the simulation value, 28.7 Hz. With the increase of excitation acceleration, both piezoelectric and electromagnetic open-circuit voltages increased. The impedance matching experiments of the EMEH and piezoelectric energy harvester (PEH) displayed that the best matching resistors are 35 Ω and 8×105 Ω respectively. In capacitor charging experiments, the maximum voltage of the capacitor (220μF) increased from 0.95 V to 1.63 V by paralleling the EMEH and the PEH. But when the EMEH and the PEH were connected in series, the maximum voltage of the capacitor (220μF) was 4.4 V. Therefore, it is clear that the proposed hybridization energy harvester balances the weakness of electromagnetic and piezoelectric harvesters. Besides, it can also make higher output performance.

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Chen, Xiao Liang, Long Zhang i Ding Yu Li. "Measurement Model for Young's Modulus of Axially Functionally Graded Materials". Key Engineering Materials 748 (sierpień 2017): 391–95. http://dx.doi.org/10.4028/www.scientific.net/kem.748.391.

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For axially functionally graded beams with elastic modulus varying through the longitudinal directions, a measurement model for Young's modulus is presented based on the classic Euler-Bernoulli beam theory. When the force and deflection of cantilever beams are measured by the experiment method, the Young's modulus of axially functionally graded beams can be obtained by the measurement model. By the derivation rule of compound functions, the validity of the measurement model is proved. For the axially functionally graded beams with elastic modulus varying according to the power law and the exponential law respectively, the deflection is simulated by the finite element method. The simulated elastic modulus by the model is in accord with the theoretical value well.

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Qin, Lei, Enrong Wang, Qi Qin, Taochun Yang i Feng Gao. "Monitoring of Dynamic Strain Response in Concrete Structure Based on Piezoelectric Sensors". Open Civil Engineering Journal 11, nr 1 (20.12.2017): 992–1002. http://dx.doi.org/10.2174/1874149501711010992.

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Background: In this study, piezoelectric sensors were embedded into concrete structures to monitor dynamic response. The embedded piezoelectric sensors had sensitive frequency and linear response. Objective: In the experiment, two loading conditions were applied to the concrete cantilever beam and concrete frame. The dynamic properties could be monitored using the embedded sensors and the damage could also be identified.

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Yang, Zhaoshu, Lihua Tang, Mengying Xie, Shuaishuai Sun, Weihua Li i Kean Aw. "Broadband nonlinear behaviour of a soft magneto-sensitive elastomer cantilever under low-frequency and low-magnitude excitation". Journal of Intelligent Material Systems and Structures 29, nr 15 (27.06.2018): 3165–84. http://dx.doi.org/10.1177/1045389x18783088.

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In this article, a soft magneto-sensitive elastomer cantilever with strong nonlinear behaviour is presented. With the help of a permanent magnet, a strong nonlinear behaviour is observed under low-frequency and low-magnitude excitation, which demonstrated its potential for vibrational energy harvesting. A theoretical model is developed which incorporates the nonlinear magnetic interaction in an Euler–Bernoulli beam. The theoretical model is further discretized using finite element method, and the frequency response was obtained through numerical simulation. Frequency sweep experiment was conducted to validate the model and investigate the nonlinear behaviour of the cantilever under different excitations. With the validated model, various contributing factors were parametrically studied to investigate their influences towards the dynamic behaviour of the cantilever. The results show that magnetic force dominates the linear stiffness increase of soft magneto-sensitive elastomer cantilever rather than the magnetorheological effect, and the nonlinear performance of soft magneto-sensitive elastomer cantilever mainly derives from horizontal magnetic force variations during vibration. These properties make the soft magneto-sensitive elastomer cantilever an attractive candidate to automatically tune and broaden the operational bandwidth of vibrational energy harvesters.

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Siva Teja, Putti Venkata, Badatala Ooha i Kondeti Sravanth. "Vibrational Analysis on Hemp and Okra Fibres Mixed Glass Fiber Polyester Composite". International Journal of Research and Review 8, nr 11 (11.11.2021): 55–62. http://dx.doi.org/10.52403/ijrr.20211108.

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In transverse vibrations the element moves to and fro in a direction perpendicular to the direction of the advance of the wave. To determine the vibration characteristics i.e., natural frequencies and mode shapes, modal analysis is a process for a structure or a machine component while is being designed. In real life, aero planes, missiles, rockets, space vehicles, satellites, sub marines etc are modeled as free-free mechanical systems. In this paper an attempt was made to compare natural frequency for two composite materials- ladies finger with Glass fiber composite and Hemp with Glass fiber composite by taking as cantilever beams. The cantilever beam which is fixed at one end is vibrated to obtain the natural frequency, mode shapes at four different modes. A simple low cost demonstration experiment is performed in this paper by using common apparatus in order to compare theoretical, numerical (FEM analysis) profiles of two free-free thin two rectangular composite beams of dimensions 305*49.5* 7 in mm. Keywords: Natural frequencies, Mode shapes, Vibration characteristics, Ladies finger fiber, Hemp fiber, Glass fiber, FEM analysis, Free-Free system.

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Ge, Qi Qi. "A Kind of Minitype 2D Vector Hydrophone". Applied Mechanics and Materials 203 (październik 2012): 273–78. http://dx.doi.org/10.4028/www.scientific.net/amm.203.273.

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A special designed 2D accelerometer was successfully used in the design of the minitype 2D vector hydrophone. The theory, design and experiment test data of both the accelerometer and the vector hydrophone was presented in this paper. The accelerometer based on cantilever beam mode and used PZT tube to substitute the PZT plate which was traditional used, this substitution enhanced the mechanical strength of the accelerometer, which resulted to the high performance of the 2D vector hydrophone in its natural frequency and sensitivity. The outside electrode of the PZT tube was divided into four equivalent parts, and each opposite part was wiring connected into one accelerometer channel, thus the two orthotropic accelerometer channels was integrate into one 2D cantilever beam mode accelerometer. The minitype vector hydrophone was designed based on this compact 2D accelerometer, and it’s high performace makes it possible to be used in under water sonar transducer arrays.

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38

Gao, Teng, J. U. Cho i Seong S. Cheon. "Experiment and Analysis on Impact of Tapered Double Cantilever Beam with Aluminum Alloy". Composites Research 27, nr 2 (30.04.2014): 72–76. http://dx.doi.org/10.7234/composres.2014.27.2.072.

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Zhang, Guangyi, Shiqiao Gao, Haipeng Liu i Shaohua Niu. "A low frequency piezoelectric energy harvester with trapezoidal cantilever beam: theory and experiment". Microsystem Technologies 23, nr 8 (30.11.2016): 3457–66. http://dx.doi.org/10.1007/s00542-016-3224-5.

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Mondal, Soumen, Sushanta Ghuku i Kashi Nath Saha. "Effect of Clamping Torque on Large Deflection Static and Dynamic Response of a Cantilever Beam: An Experimental Study". International Journal of Engineering and Technologies 15 (listopad 2018): 1–16. http://dx.doi.org/10.18052/www.scipress.com/ijet.15.1.

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The present paper reports an experimental study on the effect of finite clamping on static and dynamic characteristics of cantilever beam. The experiment is carried out with two different beams, each of which is clamped at two different locations resulting in two different geometry settings. Under each of these four settings, specimen is clamped under two different torque ratings giving rise to different finite clamping effect. Under the eight settings, coordinates of tip point under static loading are measured directly using scales and plumb at each load step; whereas, complete deflection profiles of loaded beam under each static load step are obtained through post-processing of images captured during experimentation. Such image processing is carried out manually using AutoCAD®and in-built AutoLISP®software. Strain measurements at each static load step are carried out by using strain gauge, a universal data acquisition system and the associated Catman Easy®software. To obtain loaded free vibration characteristics, loaded beam under each setting is disturbed by a rubber hammer and its dynamic response is recorded from strain gauge signal through Catman Easy®software. These dynamic strain readings of loaded beam are post-processed and FFT plots are generated in MATLAB®software and first two loaded natural frequencies of beam under each setting are obtained. Finally, effects of clamping torques on the static strain and deflection results and loaded natural frequencies for beam settings with the four different thickness to length ratios are reported in a suitable manner. The result reported may be useful as ready reference to develop a theoretical model of clamped beam like structures incorporating the effect of finite clamping.

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41

Mondal, Soumen, Sushanta Ghuku i Kashi Nath Saha. "Effect of Clamping Torque on Large Deflection Static and Dynamic Response of a Cantilever Beam: An Experimental Study". International Journal of Engineering and Technologies 15 (20.11.2018): 1–16. http://dx.doi.org/10.56431/p-51745h.

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The present paper reports an experimental study on the effect of finite clamping on static and dynamic characteristics of cantilever beam. The experiment is carried out with two different beams, each of which is clamped at two different locations resulting in two different geometry settings. Under each of these four settings, specimen is clamped under two different torque ratings giving rise to different finite clamping effect. Under the eight settings, coordinates of tip point under static loading are measured directly using scales and plumb at each load step; whereas, complete deflection profiles of loaded beam under each static load step are obtained through post-processing of images captured during experimentation. Such image processing is carried out manually using AutoCAD® and in-built AutoLISP® software. Strain measurements at each static load step are carried out by using strain gauge, a universal data acquisition system and the associated Catman Easy® software. To obtain loaded free vibration characteristics, loaded beam under each setting is disturbed by a rubber hammer and its dynamic response is recorded from strain gauge signal through Catman Easy® software. These dynamic strain readings of loaded beam are post-processed and FFT plots are generated in MATLAB® software and first two loaded natural frequencies of beam under each setting are obtained. Finally, effects of clamping torques on the static strain and deflection results and loaded natural frequencies for beam settings with the four different thickness to length ratios are reported in a suitable manner. The result reported may be useful as ready reference to develop a theoretical model of clamped beam like structures incorporating the effect of finite clamping.

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42

Liu, Zhenxi, Jiamin Chen i Xudong Zou. "Modeling the Piezoelectric Cantilever Resonator with Different Width Layers". Sensors 21, nr 1 (25.12.2020): 87. http://dx.doi.org/10.3390/s21010087.

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The piezoelectric cantilever resonator is used widely in many fields because of its perfect design, easy-to-control process, easy integration with the integrated circuit. The tip displacement and resonance frequency are two important characters of the piezoelectric cantilever resonator and many models are used to characterize them. However, these models are only suitable for the piezoelectric cantilever with the same width layers. To accurately characterize the piezoelectric cantilever resonators with different width layers, a novel model is proposed for predicting the tip displacement and resonance frequency. The results show that the model is in good agreement with the finite element method (FEM) simulation and experiment measurements, the tip displacement error is no more than 6%, the errors of the first, second, and third-order resonance frequency between theoretical values and measured results are 1.63%, 1.18%, and 0.51%, respectively. Finally, a discussion of the tip displacement of the piezoelectric cantilever resonator when the second layer is null, electrode, or silicon oxide (SiO2) is presented, and the utility of the model as a design tool for specifying the tip displacement and resonance frequency is demonstrated. Furthermore, this model can also be extended to characterize the piezoelectric cantilever with n-layer film or piezoelectric doubly clamped beam.

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Wang, Hui Feng, Guang Lin Wang i Ze Sheng Lu. "Transformation of Force-Linear Displacement and Moment-Angular Displacement on Different Measurement of Spring-Tubes Stiffness". Key Engineering Materials 392-394 (październik 2008): 136–40. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.136.

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This paper presents the measurement of hanging weight method and two-point measureing method to the elastic component spring-tubes stiffness’ measurement, and analyzes the principle of the two measuring methods mentioned above. It simplifies the transforming zone to the structure of cantilever beam. It deduces the stiffness relation, which is from the two measuring methods. At the same time it modifies the transforming formula through experiment.

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Xia, Jun Wu, Xiao Wei Liu, Fa Ming Wen i Jun Hui Xiong. "Experimental Research of a Steel Frame with Cantilever Beam Spliced Joints under Surface Deformation". Advanced Materials Research 243-249 (maj 2011): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.443.

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Structural additional force and deformation of a single-level, single span steel frame with cantilever beam spliced joints under the horizontal deformation and vertical deformation were researched by a physical simulation experiment. The results showed that the horizontal tensile-compression deformation is the most unfavorable to the frame. However, the frame was still in elastic stage and can resume normal work status after unloading, which make it a good anti-deformation performance.

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45

Jia, Hai Lei, i Yin Zhao. "Detection of Damage Extension in Cantilever Beams Using Change Ratio of Frequency Response Functions". Applied Mechanics and Materials 50-51 (luty 2011): 875–79. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.875.

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Frequency response function (FRF) is a fundamental dynamic index, which is capable of reflecting structural dynamic properties using full-spectrum information. In spite of distinct merits over conventional modal parameters, the FRF has an observable drawback of multi-dimensionality, unsuited for damage characterization. Such a situation motivates an interesting subject, i.e., extracting low-dimensional, high-sensitivity damage index from the FRF. This study focuses on developing a valid damage index, called FRF change ratio, to detect extension of damage. An experiment towards cantilever beams is systemically conducted. The results show that the FRF change ratio can effectively reflects damage extension, and it is more sensitive than conventional natural frequencies. This new damage index holds promise for practical damage detection in beam-like structures.

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Hlača, Ivan, Marin Grbac i Leo Škec. "Determining Fracture Resistance of Structural Adhesives in Mode-I Debonding Using Double Cantilever Beam Test". Zbornik radova 22, nr 1 (20.12.2019): 59–74. http://dx.doi.org/10.32762/zr.22.1.4.

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Double cantilever beam (DCB) test is the most commonly used test for determining the fracture resistance of structural adhesive joints in mode-I debonding. Test specimens are composed of two equal plates that are glued together, and then exposed to the opening load causing crack propagation along the bonded surface. During the experiment, loadline displacement, applied force and crack length are measured continuously. Using these data, the fracture toughness of the adhesive can be computed by the procedure given in the relevant ISO standard (BS ISO 25217:2009). The calculations are based on simple beam theory and linear elastic fracture mechanics (LEFM) equations. In this paper, we will present the standard method for performing a DCB test and the method for data processing required to obtain the adhesive fracture toughness, i.e. the critical energy release rate. Experiments are performed for SikaPower® 4720 adhesive, applied with controlled thickness between the aluminium plates (adherends). After the curing period recommended by the adhesive manufacturer, DCB specimens with piano hinges are loaded by a tensile-testing machine. Loading is applied in the displacement-control mode because when the crack starts to propagate, the applied load drops. Using the optical measurement system GOM Aramis, complete displacement field is recorded during the experiment. Displacement field is then used to obtain the actual load-line displacement of the adherends (different than the one recorded on the tensile-testing machine grips) and the position of the crack tip. After syncing the measurements from different devices, fracture toughness for the adhesive is determined and a statistical analysis performed.

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Zhao, Ran, Qan-guo Lu i Qinghua Cao. "Magnetostrictive Bioinspired Whisker Sensor Based on Galfenol Composite Cantilever Beam Realizing Bidirectional Tactile Perception". Applied Bionics and Biomechanics 2018 (24.07.2018): 1–7. http://dx.doi.org/10.1155/2018/4250541.

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A magnetostrictive bioinspired whisker sensor based on a galfenol/beryllium-bronze/galfenol composite cantilever beam was developed in this work. According to the new design concept, the proposed whisker can output positive and negative voltages under different bending directions. Besides, the proposed whisker sensor can realize the bidirectional distance and microforce perception. Using the classical beam theory, a theoretical model was used to predict the output performance of the whisker. An experimental system was established to test the whisker’s output performance. In the experiment, the designed whisker, compared with a traditional unimorph whisker, displayed an output voltage range of −240 to 240 mV. The parameters were as follows: the distance was 0–22 mm, with the microforce sensing range of 9.8–2744 mN, the average distance was 10.90 mm/mV, and the force sensitivity was 11.4 mN/mV. At last, obstacle perception was applied. The experiment showed that the proposed whisker sensor can realize the bidirection tactile perception in one-dimensional space. The work expands the function of the magnetostrictive bioinspired whisker, acquiring the multi-information for single-sensor system.

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Kovářová, Jana, Miloš Schlegel i Jan Dupal. "Dependency of the Quality of the Active Vibration Damping on the Sensor and Actuator Location – Simulation and Experiment". Solid State Phenomena 147-149 (styczeń 2009): 215–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.215.

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The paper deals with the vibration suppressing of cantilever beam. The state feedback control law is used, where the controller and observer are designed by pole assignment method. First two natural frequencies are considered for design of the control law. The analysis of the location of actuator and sensor are investigated. Experimental results obtained from the closed loop system with incomplete pole assignment are compared with uncontrolled system.

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Wang, Xue Min, i Fang Lin Huang. "HHT-Based Modal Parameter Identification of Time-Varying Structures and Experiment Study". Advanced Materials Research 243-249 (maj 2011): 5444–49. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5444.

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A method for modal parameter identification of time-varying structures based on Hilbert- Huang transform (HHT) is presented. Theoretical formulas for identifying the modal frequency and damping radio using the displacement response of a time-varying SDOF structure are deduced. Taking advantage of modal filtering characteristics of empirical mode decomposition (EMD), the presented method is expanded to identify the modal parameters of MDOF structures. Numerical simulation of a three degrees of freedom structure with time-varying stiffness and damping show the validity of the method. Finally, a time-varying structure experiment is designed to further study the method. The experimental device is a cantilever beam. By adjusting the adjunctive mass and stiffness, two kinds of time-varying structures with continuous mass change and stiffness change is realized respectively. Modal parameters are identified from the free acceleration response of the beam.

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Анкудинов, А. В., i А. М. Минарский. "Оптимизация измерений вектора силы взаимодействия в атомно-силовой микроскопии". Журнал технической физики 91, nr 6 (2021): 1043. http://dx.doi.org/10.21883/jtf.2021.06.50877.303-20.

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The issue of optimization of measurements of three spatial components of the probe-sample interaction force and the corresponding displacement vector of the "ideal cantilever" is considered. To determine these components in an atomic force microscope with an optical beam deflection scheme, it is necessary to register the bending angles at least at two points on the rectangular cantilever and the torsion angle at any of them. It has been proven analytically that one optimal point is the intersection of the probe axis with the console plane. A method to calculate the position of another optimal point has been developed. An experiment was carried out to map the force and displacement vector, and satisfactory agreement with the theory was obtained.

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