Journal articles: 'Modal dynamic analysis'

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Janchikoski, Aline Ribeiro, and José Filipe Bizarro Meireles. "Dynamic analysis of a free vibrating cantilever beam." Núcleo do Conhecimento 01, no. 06 (2023): 123–42. https://doi.org/10.32749/nucleodoconhecimento.com.br/engineering-mechanical-engineering/dynamic-analysis.

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This paper has as subject a theoretical, numerical and experimental study of the behavior of a 1.5 meters long and cross section of 0.02 meters wide and high beam. The main objective was to analyze a structure, in this case it was a cantilever steel beam, to establish the possible solutions that best define the behavior of this structure, to obtain the results and to prove the veracity of the results obtained by means of an experimental analysis method. In this sense, essential theoretical foundations were used for the understanding and realization of the mathematical formulations of this project, in order to obtain the analytical results of the vibration modes of the beam and respective natural frequencies. To complement the analysis of the beam behavior, the finite element method procedure was applied using the ansys software to obtain more accurate results. The results obtained for the beam from these two methodologies include bending modes among the first 10 degrees of freedom. To validate the study done previously a physical model of the beam was used for the experimental test, for this it was defined that the equipment for measuring the resonance frequencies would be a digital stroboscope, enabling the measurement of only 8 vibration modes due to its small frequency range.

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Ciurezu-Gherghe, Leonard Marius, Nicolae Dumitru, Ionuţ Daniel Geonea, and Cristian Copiluși. "Dynamic and Modal Analysis of a Snake like Robot." Applied Mechanics and Materials 896 (February 2020): 203–10. http://dx.doi.org/10.4028/www.scientific.net/amm.896.203.

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In this paper a modal and dynamic analysis of a snake like robot is performed. Modal analysis consist in determination of own vibration modes and natural frequencies. The proposed dynamic analysis was performed in order to determine the variation time/frequency laws for the cinematic and dynamics parameters.

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An, Li Qiang, Fan Peng Kong, and Yong Fang Wang. "Dynamic Characteristics Analysis for Seismic Vibrator." Applied Mechanics and Materials 472 (January 2014): 48–55. http://dx.doi.org/10.4028/www.scientific.net/amm.472.48.

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Seismic vibrator is one of the most widely used equipments in exploration field. In recent years, with the development of exploration field, as well as the growing needs of high quality seismic data, the seismic vibrator's tonnage has increased a lot, which makes the stress of the vehicle frame very complicated in working state. And some local structure of the vehicle frame often appears crack phenomenon in working state. Therefore, the dynamic characteristic analysis is essential to the Seismic vibrator. In this paper, the finite element model of vehicle frame is established by ANSYS software. Through the modal analysis, the natural frequencies are obtained, and each vibration modes are analyzed. On the basis of the modal analysis, the modal neutral file of the vehicle frame is established. Using the data transfer function between ANSYS and ADAMS, the rigid-flexible coupling multi-body model is built for the dynamics simulation of the seismic vibrator. In this model, the stiffness and damping of air springs, hydraulic oil and soil are simulated by the spring-damper in the ADAMS software. The dynamic characteristics of vehicle frame under excited forces with different amplitude are obtained and analyzed. The stresses for some of the hot spots of the vehicle frame are extracted, which can be used to analyze the dynamic failure of the vehicle frame.

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Ghorbel, A., M. Abdennadher, B. Zghal, L. Walha, and M. Haddar. "Modal Analysis and Dynamic Behavior for Analytical Drivetrain Model." Journal of Mechanics 34, no. 4 (2017): 399–415. http://dx.doi.org/10.1017/jmech.2017.23.

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AbstractA generalized dynamic model for an automotive drive train system was detailed to investigate its modal properties and dynamic behavior. The model's engine excitation, clutch, gearbox and disc brake were presented. Then, vibration modes were obtained and classified into clutch, transmission system, disc brake, bearing and combined modes. For each vibration mode, the kinetic and strain modal energies distributions were studied. The dynamic equations were resolved using the numerical Newmark method. The dynamic behavior of the bearings and transmission errors for the two gear stages were studied, and, the effect of the disc brake parameters on the transmission error was analyzed. Finally, a frequency sweep analysis was studied to investigate the system resonance problem.

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Fergusson, N. J., and W. D. Pilkey. "Finite Dynamic Elements and Modal Analysis." Shock and Vibration 1, no. 2 (1993): 171–76. http://dx.doi.org/10.1155/1993/975327.

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A general modal analysis scheme is derived for forced response that makes use of high accuracy modes computed by the dynamic element method. The new procedure differs from the usual modal analysis in that the modes are obtained from a power series expansion for the dynamic stiffness matrix that includes an extra dynamic correction term in addition to the static stiffness matrix and the consistent mass matrix based on static displacement. A cantilevered beam example is used to demonstrate the relative accuracies of the dynamic element and the traditional finite element methods.

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Rosenthal, David, and James Trolinger. "Dynamic holographic modal analysis for NDT." Optics and Lasers in Engineering 24, no. 2-3 (1996): 129–44. http://dx.doi.org/10.1016/0143-8166(95)00024-0.

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Mofid, Massood, Panam Zarfam, and Babak Raiesi Fard. "On the modal incremental dynamic analysis." Structural Design of Tall and Special Buildings 14, no. 4 (2005): 315–29. http://dx.doi.org/10.1002/tal.271.

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Zeng, Wen, Hong Mei Xia, Yu Xing Wang, and Liu Yi Wang. "Dynamic Characteristic Analysis of Inertial Navigation Platform' Structure." Advanced Materials Research 479-481 (February 2012): 1560–64. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1560.

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The three-dimensional solid model and finite element model of an inertial navigation platform, is established by using ANSYS software. A modal analysis has been carried out. The former 6 ordered nature frequency and modal shape have been obtained and kept away from the frequency of Laser Gyro. The finite element model of the system vibration is established and is analysed for harmonic response. The calculation data show that vibration amplitude is very small and has no influence for the Laser Gyro working. The theory modal data is the same as the modal test results, so it manifests the accuracy and effectiveness in the modeling and analysis.

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Nicoletti, Vanni, Riccardo Martini, Lorenzo Amico, Sandro Carbonari, and Fabrizio Gara. "Operational modal analysis for supporting the retrofit design of bridges." ce/papers 6, no. 5 (2023): 1182–88. http://dx.doi.org/10.1002/cepa.2125.

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AbstractAmbient vibration tests and operational modal analysis are commonly adopted worldwide to identify the dynamic behaviour of structures because they offer several advantages such as the use of portable light equipment, the possibility to be performed without interruptions of the structure serviceability, and the use of ambient noise to globally excite the construction. Ambient vibration tests are also usually adopted in structural health monitoring systems to control changes in the dynamic behaviour of structures over the time. In this paper the dynamic identification of two multi‐span simply supported prestressed RC deck bridges in Central Italy is presented. The modal parameters of the structures are identified adopting operational modal analyses based on in‐situ ambient vibration measurements. The experimentally identified dynamics is adopted to assess the bridges' seismic retrofitting works and to investigate their dynamic behaviour in the retrofitted state.

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Monkova, Katarina, Peter Monka, Andrea Cizikova, Filip Murgas, Jan Rehor, and Milan Edl. "Modal Analysis as the Base of Dynamic Analysis." Applied Mechanics and Materials 798 (October 2015): 148–52. http://dx.doi.org/10.4028/www.scientific.net/amm.798.148.

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The article deals with the modal analysis as a tool for specification of natural frequencies and the mode shapes of the turning tool. This type of analysis is the first step that is necessary to do at the dynamic analysis of technical components. At the beginning, the verification of numerical method was realized in laboratory conditions, where the fixed beam substituted the turning tool. Vibrodiagnostics of the real cutting tool in the workshop and the modal analysis using FEM in the software PTC Creo followed. It can be said that the results of the numerical method based on FEM were comparable with the data achieved by means of experimental measurements. The work described in this paper can be considered as a foundation for the dynamic tool life analysis.

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Chu, Cheng Chun, Liang Sheng Wu, Yuan Yuan Li, Yi Chuan Xiao, and Bao Zhu Zhang. "Fixed Contact Surface Modal Analysis." Advanced Materials Research 566 (September 2012): 257–62. http://dx.doi.org/10.4028/www.scientific.net/amr.566.257.

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Finite element analysis software ANSYS analysis a combination sections beam which has contact surface and a integral model. Then find out the difference to identify the overall model and the parts beam dynamic differences. According to the result learn the contact surface how to influence the tools dynamic. It can offer theoretical and practical basis for design and structure optimization.

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Wang, Zhigang. "Analysis of preload modal characteristics of hydraulic cylinders based on finite element method." Vibroengineering Procedia 53 (November 27, 2023): 53–58. http://dx.doi.org/10.21595/vp.2023.23718.

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In order to study the dynamic response of hydraulic cylinders under complex load conditions, the modal characteristics of hydraulic cylinders were simulated and calculated by comprehensively considering the combined effects of preload and oil fluid dynamics. The contact in the finite element model was specially processed to ensure that the local degrees of freedom of the piston in the structure were maintained during the modal simulation calculation process. After the static characteristics were calculated, the relevant data was imported into the modal simulation module to achieve coupling analysis under preload. By verifying the contact stiffness factor, the boundary conditions of the model were effectively optimized. The natural frequencies of the model were compared and analyzed under different piston strokes, and the mechanism of dynamic response was obtained. Through modal testing, the results indicated that the simulation results had high accuracy and reliability.

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Mao, Kun Li. "Modal Analysis and Dynamic Test of Steel Slag Vehicle." Applied Mechanics and Materials 397-400 (September 2013): 564–67. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.564.

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Steel slag vehicles with tilting arm are advanced equipment used in iron and steel factory for short distance delivery. With great impact force and severe vibration when pouring steel slag, strength of equipment structure must be enough. In product design, theoretical study and simulation of steel slag vehicles were completed using commercial finite element software and dynamics software. Static strength and dynamic tests of some steel slag vehicle were finished using dynamic and static stain instruments, acceleration transducer in order to verify the computer analysis result. The modal analysis result of steel slag vehicle, the field dynamic test procedure and data process are shown in this article. In the end of paper, conclusions are drawn useful for design and manufacture of heavy-duty equipment such as steel slag vehicles.

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Song, Shun Guang, Chun Jie Wang, Han Wang, and Qiu Hong Lin. "Dynamic Analysis of Extendible Support Structure Deployment." Applied Mechanics and Materials 163 (April 2012): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amm.163.91.

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To study the dynamic behavior of the extendible support structure deployment, a digital simulation using the multibody system dynamics methodology is conducted. Floating frame of reference formulations are used to establish the flexible dynamics model, in which the deformation vector of each flexible part is modeled with the component mode synthesis technique based on the Craig-Bampton method. Modal truncation is implemented through modal participation factors to reduce the computational burden. Angular displacements results of antenna panels as well as those of truss rods are then obtained and show that all parts of the structure have reached accurate positions and keep stable after deployment as expected. Start torque of the driving motor is also acquired and proved acceptable according to the design requirements. Impact forces acting on the hinges at locking moment are finally extracted to evaluate performances of locking processes.

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Hadianfard, Mohammad Ali, and Soroosh Kamali. "Analysis of Modal Frequencies Estimated from Frequency Domain Decomposition Method." International Journal of Engineering and Technology 12, no. 3 (2020): 41–47. http://dx.doi.org/10.7763/ijet.2020.v12.1182.

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Frequency Domain Decomposition (FDD) is an operational modal analysis method by which the dynamic parameters of structures are obtained using response signals recorded on several locations of structures. In recent years, many researchers have employed the method to estimate the modal parameters of several Multi-Degree-of-Freedom (MDOF) mechanical and civil systems. The accuracy of the results depends on recording and signal processing parameters such as sampling frequency, windowing, filtering etc. As a result, investigation on the influence of these parameters on the accuracy of the estimates is a good practice. In this research, the uncertainty of modal frequencies obtained from FDD method is analyzed. In order to achieve this goal, the exact values of modal parameters must be available to be compared with the results from FDD method. For this purpose, synthetic signals with random characteristics the same as the ambient vibrations’ are produced and structures with known dynamic parameters are simulated and loaded. The effect of several parameters are investigated in the accuracy of results and proper values and settings are proposed to minimize the errors.

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Sun, De Wei, Zhi Gang Chen, and Guang Yu Zhang. "Dynamic Analysis of a Calibration Mechanism." Applied Mechanics and Materials 37-38 (November 2010): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.366.

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In order to verify the reliability of a calibration mechanism including a motion component used in the satellite, the dynamic analysis for this mechanism is conducted with modal coordinate reduction method. Firstly, FEM software ABAQUS is employed to calculate the eigenfrequency and mode shapes of this mechanism. Then, the transfer function at some key points can be acquired by coordinate transformation from its original format in modal coordinate. Finally, the power spectral density at the key points are obtained and compared with the results of random vibration experiments to prove the dynamics analytical validity.

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Lu, Mo Wu, Guo Ming Zhang, and Wei Qiang Zhao. "Analysis on Dynamic Characteristics of HTC100 NC Lathe Bed." Advanced Materials Research 328-330 (September 2011): 700–703. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.700.

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The processing performance is closely related with dynamic performance and the dynamic performance is one of the most important performance indicators which is affecting the performance and product quality. The machine is affected most by the dynamic performance of machine bed. The modal analysis method is used to analyze the dynamic performance of the machine. In this paper, the modal analysis of lathe bed is conducted. A 3D solid model of HTC100 NC lathe bed is built with SolidWorks. In order to facilitate the finite element analysis, the model of lathe bed is simplified. The modal analysis of lathe bed is calculated with ANSYS Workbench 12. The first six natural frequencies and corresponding modes are obtained through modal analysis of the lathe bed. According to the low-order natural frequency and modal vibration shapes, the rigidity vulnerable area of lathe bed is realized, which provides the reliable theory to improve lathe bed structure.

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Sun, Zhi Juan, and Jing Tao Dai. "Modal and Strength Analysis of Crankshaft in Piston Compressor." Advanced Materials Research 945-949 (June 2014): 676–79. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.676.

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For research on comprehensive performance of crankshaft in piston compressor, multi-body dynamics model was built to get mechanical boundary conditions of the crankshaft, and the fatigue strength was verified; Finite element model (FEM) of the crankshaft was established, and the 1st 6 modal of the crankshaft was obtained. The results showed that fatigue strength and dynamic characteristic of the crankshaft was qualified. Theoretical basis could be provided for optimize the crankshaft’s structure by fatigue strength and modal analysis.

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Yam, L. H., Li Cheng, Z. Wei, and Y. J. Yan. "Damage Detection of Composite Structures Using Dynamic Analysis." Key Engineering Materials 295-296 (October 2005): 33–38. http://dx.doi.org/10.4028/www.scientific.net/kem.295-296.33.

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A study on the use of modal parameter analysis for damage detection of structures made of composites is conducted. The damage-induced variations of modal parameters are investigated both numerically and experimentally. An appropriate finite element model is proposed to analyze the dynamic characteristics of different types of structures made of composites, such as honeycomb sandwich plates and multi-layer composite plates, with internal cracks and delamination. The numerical results are in good agreement with experimental results available in the literature. Natural frequencies, modal displacements, strains and energy are analyzed for the determination of damage severity and location. Vibration measurements are carried out using piezoelectric patch actuators and sensors for comparison and verification of the FEM model proposed in this study. Energy spectrum for wavelet packets decomposition of structural dynamic responses is used to highlight the features of damaged samples. The mechanism of mode-dependent energy dissipation of composite plates due to delamination is revealed for the first time. Experimental results clearly show the dependence of changes of modal parameters on damage size and location. The results obtained in this study show that the measured modal damping change combined with the computed modal strain energy distribution can be used to determine the location of delamination in composite structures. Both numerical and experimental findings in this study are significant to the establishment of guideline for size and location identification of damage in composite structures.

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Li, Din Geng, Ji Guang Cao, Jun Wen Wang, and Chuan Yao Chen. "The Design and Analysis of a New Type of Vibration Structure." Applied Mechanics and Materials 1-2 (September 2004): 71–80. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.71.

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In this paper, a new type of vibration structure (i.e. swing frame) of vertical dynamic balancing machine is designed, which is based on the analysis of traditional double-plane vertical dynamic balancing machine’s swing frame. The static unbalance and couple unbalance can be separated effectively by using the new dynamic balancing machine with the new swing frame. The modal and harmonic responses are analyzed by using the ANSYS7.0. By comparing the finite element modal analysis with the experimental modal analysis, the natural frequencies and vibration modes are found out, which can provide the dynamics direction for designing vertical dynamic balancing machine. The new dynamic balancing machine can measure static unbalance and couple unbalance directly, and the influence between them is faint. The practical result indicates that the new vertical dynamic balancing machine is suitable for inertial measurement of flying objects, and can overcome the shortcomings of traditional double-plane vertical dynamic balancing machines, in which the effect of plane-separation is inferior. The vertical dynamic balancing machine with the new vibration structure can be widely used in the future application.

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Wang, Jun Jun, and Lu Lu Yi. "Seven Mega Floor MSCSS Modal Analysis." Applied Mechanics and Materials 353-356 (August 2013): 2210–15. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2210.

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Modal analysis is also known as dynamic analysis for mode-superposition method. In the seismic response analysis of linear structural systems, it is one of the most commonly used and the most effective ways. Through the modal analysis of building structure, we can get some basic performance parameters of the structure. These parameters can help us make qualitative judgments for the respond of a structure first, and can help us judge whether they meet demands for conceptual design. Modal analysis is also the basis of other dynamic response analysis, including dynamic time history analysis and response spectrum analysis.

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Shen, Chun Gen, Gui Cheng Wang, Shu Lin Wang, Wen Wu Nie, and Gang Liu. "Computation and Analysis of Unbalancing Responses of High Speed Machining Tool System." Advanced Materials Research 148-149 (October 2010): 40–46. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.40.

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In this study, an integrated methodology combining computational modal analysis, experimental modal analysis, and computational dynamic analysis was developed to investigate unbalancing dynamic responses of high speed machining tool systems. A linear-elasticity formulation based on the finite element method (FEM) was employed to compute the natural frequencies and obtain the corresponding modal shapes. Experimental modal analysis was then performed to verify the natural frequencies. After the validation, the FEM model was further modified to predict the dynamic responses, with an HSK (a Germany abbreviation of Hohl Schaft Kegel) tool system as a model system. The results indicated that, by validating the computed natural frequencies with experimental ones, an effective simulation model can be established for predicting complex dynamic response of high speed machining tool systems.

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He, Yu Jing, Jiang Feng Shen, and Xiang Fu Li. "Spray Car Workbench Racks of Modal Analysis." Advanced Materials Research 1094 (March 2015): 469–74. http://dx.doi.org/10.4028/www.scientific.net/amr.1094.469.

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The author designed a intelligential spray car of fruit tree, this support frame of worktable support the whole spraying arm in the course, its dynamic properties is important to determine the product quality and life. On the basis of three-dimensional modeling, The modal of dynamic that support frame was analysis and the first ten modal parameters (natural frequencies and mode shapes) was calculated by using ANSYS finite element of analysis software. Compared with Modal parameters by method and experimental modal analysis obtained, summarizes the higher modes of dynamic structure, and proposed modifications for the structure.

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Pratapsinha, Patil, and P. G. Karajagi Prof. "Analysis of Crack in Shaft using Creo." Journal of Recent Trends in Mechanics Volume 4, no. 1 (2019): 1–8. https://doi.org/10.5281/zenodo.2594401.

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This paper deals with finding the relation between modal natural frequencies change due to crack in shaft with respective crack depth and location. In this study we investigate relation among crack depth, crack location & natural frequency. Finite Element Analysis is done for single crack at different depth and crack thickness. The analysis results reveal, how modal natural frequencies decrease with change in crack size. It is known that when a shaft or structure suffers from crack or any damage then its dynamic property changes. The reason for this behaviour because of crack causes a stiffness reduction with an inherent reduction in modal natural frequencies which leads to the change in the dynamic response of the Shaft. Creo software is used for parametric modeling of Rotor Shaft as well as for static and dynamic analysis. Modal natural frequency was found to be decreasing with increase in crack depth and its width. This is new technology in Creo, so this study the FEA analysis is carried out using this new technology and compared with other FEA software available in market.

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Yang, Xu Dong, Liang Liang Jin, Jia Chun Li, Zhi Qiang Jin, and Jin Zhao. "Dynamic Analysis of Cross Simulator." Applied Mechanics and Materials 52-54 (March 2011): 1698–702. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1698.

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The finite element model of cross simulator including supporting structure, beam, etc. was set up in the environment of ABAQUS. After the static analysis which meets the requirements, the model’s dynamic characteristics when bearing impact load was obtained using explicit method according to modal analysis results. Comparing different analysis results with technical index, it indicates that larger impact load makes the dynamic characteristics worse significantly.

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Zhang, Lian Wan, Zhong Jun Yin, Bing Chen, Zhi Chao Tang, and Zheng Tian. "Dynamic Simulation and Experimental Modal Analysis of Large Vibratory Feeder." Advanced Materials Research 139-141 (October 2010): 2423–26. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2423.

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The LMS Test.Lab system was used to carried out experimental modal analysis of large vibratory feeder, the PloyMAX method was employed to estimate and identify the modal parameter of vibratory feeder and the modal parameters such as modal frequencies, modal damping ratios and mode shape at concerned band were got; Compared the results of experimental modal analysis to the results of finite element method, the results show that the experimental modal analysis and finite element analysis was consistent to some extent, verified the correctness of finite element model; the bias between experimental and theoretical is inevitable, the experimental results are more reliable relative to the actual and better reflect the dynamic characteristics of vibratory feeder, which will be provided as the reference for dynamic design and dynamic improvement of the vibratory feeder.

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Farhat, Charbel, and Edward Wilson. "Modal superposition dynamic analysis on concurrent multiprocessors." Engineering Computations 3, no. 4 (1986): 305–11. http://dx.doi.org/10.1108/eb023671.

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Zhang, Sheng Tong, Ji Zhong Zhang, Mei Zhao, Lian Jun Cheng, and Ning Zhang. "Dynamic Characteristic Analysis of the Internal Combustion Air Compressor." Advanced Materials Research 986-987 (July 2014): 832–36. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.832.

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By applying the seamless data interface between SolidWorks and ADAMS, the model of the internal combustion compressor was imported. The internal combustion compressor virtual prototype model was established, the kinematics and dynamics analysis were completed, and the dynamic load on crankshaft was given. After we use finite element analysis software ANSYS, the modal analysis of crankshaft were accomplished, the modes of vibration and response frequency in the first five orders were obtained. The mixed body dynamics model was established, and the crankshaft force curves under the rigid body and flexible body morphology were obtained.

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Qiu, Hai Fei, and Song Lin Wu. "Dynamic Response Analysis of NC Machine Tool's Bed on ANSYS." Applied Mechanics and Materials 392 (September 2013): 122–26. http://dx.doi.org/10.4028/www.scientific.net/amm.392.122.

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Finite element model of NC machine tools bed was set up in ANSYS, natural frequencies and modal shapes in low order were calculated by modal analysis of the bed. Then displacement-frequency curve and stress-frequency curve between 300 Hz and 700 Hz were acquired based on harmonic response analysis of the bed, and dynamic response of the bed which affected by harmonic load was clear; Transient dynamic analysis of the bed was finished by Full method, then displacement curve and acceleration curve about time domain were acquired, and influence of impact load during the process of starting NC machine tool which affect on the bed was understand, in results, some important references and basis were offered to optimal design of the beds dynamics.

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Carlos, de la Cruz Alejo, R. Torres-San Miguel Christopher, Paredes-Rojas Juan, and E. Ortiz-Hernández Fernando. "Clamped edge stress analysis in H-13 steel." Eastern-European Journal of Enterprise Technologies 6, no. 7(108) (2020): 14–20. https://doi.org/10.15587/1729-4061.2020.217845.

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The dynamic behavior in the clamped edge stress of structures is not yet fully understood clearly; also, clamped structures involve uncertainty. This research presents a numerical and analytical study of clamped edge stress behavior due to the load imposed by the chip-cutting tool on a workpiece. Clamping system, which is made of H-13 steel and machining workpiece made of AISI 8620 steel are analyzed. The maximum clamped edge stress is analyzed through dynamic response, considering the machined part as a cantilever beam, involving the constitutive relations as well as the compatibility equations. The central differential equation of motion leads us to determine the modal stresses that are a primary characteristic of the structure and that are also distributed in it. Once the modal stress has been determined as well as the maximum amplitude at the free end of the specimen to be machined, it is possible to calculate the maximum clamped edge stress that is generated between both the specimen and the clamping system. Finally, a numerical analysis of the clamping jaw is performed for the discretised system and analyzed separately using the finite element method. Clamped edge stresses are assessed through a modal study using a set of numerical simulations to corroborate the modal stress estimated analytically. The results show that the clamped edge stress in the clamping system is a considerable influence in the design parameters of the structure. Therefore, complete knowledge of the dynamic response of the clamping system will lead to better structural design with the possibility of using different materials for the same purpose

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Patwari, Anayet U., Waleed F. Faris, A. K. M. Nurul Amin, and S. K. Loh. "Dynamic Modal Analysis of Vertical Machining Centre Components." Advances in Acoustics and Vibration 2009 (February 2, 2009): 1–10. http://dx.doi.org/10.1155/2009/508076.

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The paper presents a systematic procedure and details of the use of experimental and analytical modal analysis technique for structural dynamic evaluation processes of a vertical machining centre. The main results deal with assessment of the mode shape of the different components of the vertical machining centre. The simplified experimental modal analysis of different components of milling machine was carried out. This model of the different machine tool's structure is made by design software and analyzed by finite element simulation using ABAQUS software to extract the different theoretical mode shape of the components. The model is evaluated and corrected with experimental results by modal testing of the machine components in which the natural frequencies and the shape of vibration modes are analyzed. The analysis resulted in determination of the direction of the maximal compliance of a particular machine component.

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Liu, Yong Ping, and Cun Yang. "Modal Analysis of High-Order Elliptical Gears." Applied Mechanics and Materials 633-634 (September 2014): 1191–95. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.1191.

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Modal is the natural vibration characteristic of mechanical structures, and each modal has its specific natural frequency, damp radio and modal shape. Modal of vibration is the natural and total character of elastic structures. By modal analysis, the structure’s characters of different principal modal within a impressionable frequency range can be understanded, and is an important method in terms of structure’s dynamic design and machinery fault diagnosis. It provides basis for vibrating characteristics analysis, vibrating fault diagnosis of the systems, or forecasting and analyzing the dynamic characteristics of noncircular gear.

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Jiang, Bin, Min Li Zheng, Jun Zhou, and D. H. Xia. "Dynamics Characteristics of High Speed Ball-End Milling Cutter for Machining Hardened Steel." Key Engineering Materials 455 (December 2010): 127–31. http://dx.doi.org/10.4028/www.scientific.net/kem.455.127.

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In order to depress cutter vibration caused by high hardness and periodic change of cutting force in high speed milling complex surface, investigated the modal characteristics of ball-end milling cutter through the modal analysis and transient analysis. Using the models of dynamic cutting force and cutting vibration, acquired dynamics characteristics of high speed ball-end milling cutter by the spectrum analysis of dynamic cutting force, simulation analysis of cutting vibration and experiment of high speed milling hardened steel. Results indicate that high speed ball-end milling energy concentrates in few special frequencies, the rotational speed and the numbers of cutter teeth determine the fundamental frequency. High speed ball-end milling cutter easily makes radial bending vibration by the lower modal characteristics, the overhang and inclination angle of cutter affect its dynamics characteristics significantly, and the modal parameters and vibration model of cutter acquired by step response method have higher credibility.

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Qin, Xu Da, Cui Lu, Qi Wang, Hao Li, and Lin Jing Gui. "Modal Analysis of Helical Milling Unit." Advanced Materials Research 482-484 (February 2012): 2454–59. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.2454.

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Based on the analysis of the working principle and structure characteristics of helical milling unit, the prototype’s three-dimensional model was built, the prototype’s finite element modal analysis was conducted, and the first 6 natural frequencies and their mode shapes were obtained. The finite element model is experimentally validated by comparing finite element and experimental modal’s parameters. This paper investigates the dynamic properties of prototype, and provides theoretical references for the subsequent dynamic analysis and structural optimization.

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Quan, Wei Chuang, Mei Fa Huang, Zhi Yue Wang, and Da Wei Zhang. "Modal Analysis for Swing-Arm of LED Die Bonder." Advanced Materials Research 422 (December 2011): 379–82. http://dx.doi.org/10.4028/www.scientific.net/amr.422.379.

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Led die bonder used for bond lead frame and chip is one of the key equipment of led production line. The swing-arm is an important component of led die bonder and its dynamic characteristics will directly affect the piece accuracy. At present, the accuracy and efficiency of led die bonder are limited because of the vibration of the swing-arm. In solving this problem, a three-dimensional finite-element model for swing-arm is built to provide analytical frequencies and vibration modes. Then the modal distribution and vibration mode shapes for swing-arm are obtained after analyzing the modal by ansys10.0. Finally the dynamics effects of this structure by modal frequency and vibration mode are analyzed. The modal analysis of structural would provide the reference to dynamics analysis and structural optimization for swing-arm in practical use.

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Chandravanshi, M. L., and A. K. Mukhopadhyay. "Modal Analysis of a Vertically Tapered Frame." International Journal of Structural Stability and Dynamics 17, no. 03 (2017): 1771001. http://dx.doi.org/10.1142/s0219455417710018.

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The paper delineates the procedure to assess probable failure sections through the dynamic conditions of a vertically tapered frame using the experimental modal analysis (EMA), which is validated through the finite element analysis (FEA). The modal parameters are experimentally determined by the frequency response functions (FRFs) using the accelerometer, force transducer, electro-dynamic shaker, dynamic signal analyzer (DSA) and post processed by the ME’Scope software. The ANSYS Workbench 14 was used for finding the modal parameters through the FEA. The FEA model was also tested by convergence study. The boundary conditions of the vertically tapered frame in the FEA is kept similar to the EMA. The values obtained by the two methods have been compared for their proximity.

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Sun, Lei, Ming Hai Wang, Xiao Peng Li, and Yue Sun. "Dynamic Characteristic Analysis of CNC Machine Tool Frame." Advanced Materials Research 338 (September 2011): 491–94. http://dx.doi.org/10.4028/www.scientific.net/amr.338.491.

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A three-dimensional model of a machine tool frame was established. The modal analysis and harmonic response analysis were done by means of finite element method. Its characteristics of vibration modal were obtained.Then we select one point in the largest deformation area and make the harmonic response analysis. The analysis is conducive to the design of the machine tool frame and it is of great significance for improving the quality of design of machine tools.

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Lee, Chong-Won, Jong-Po Park, and Kwang-Joon Kim. "Complex Time Series Modeling and Analysis for Rotor Dynamics Identification." Journal of Vibration and Acoustics 119, no. 4 (1997): 512–22. http://dx.doi.org/10.1115/1.2889753.

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A new time series method, directional ARMAX (dARMAX) model-based approach, is proposed for rotor dynamics identification. The dARMAX processes complex-valued signals, utilizing the complex modal testing theory which enables the separation of the backward and forward modes in the two-sided frequency domain and makes effective modal parameter identification possible, to account for the dynamic characteristics inherent in rotating machinery. The dARMAX is superior in nature to the conventional ARMAX particularly in the estimation of the modal parameters for isotropic and weakly anisotropic rotors. Numerical simulations are performed to demonstrate effectiveness of the dARMAX.

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Dai, Yuting, Linpeng Wang, Chao Yang, and Xintan Zhang. "Dynamic Gust Load Analysis for Rotors." Shock and Vibration 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5727028.

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Dynamic load of helicopter rotors due to gust directly affects the structural stress and flight performance for helicopters. Based on a large deflection beam theory, an aeroelastic model for isolated helicopter rotors in the time domain is constructed. The dynamic response and structural load for a rotor under the impulse gust and slope-shape gust are calculated, respectively. First, a nonlinear Euler beam model with 36 degrees-of-freedoms per element is applied to depict the structural dynamics for an isolated rotor. The generalized dynamic wake model and Leishman-Beddoes dynamic stall model are applied to calculate the nonlinear unsteady aerodynamic forces on rotors. Then, we transformed the differential aeroelastic governing equation to an algebraic one. Hence, the widely used Newton-Raphson iteration algorithm is employed to simulate the dynamic gust load. An isolated helicopter rotor with four blades is studied to validate the structural model and the aeroelastic model. The modal frequencies based on the Euler beam model agree well with published ones by CAMRAD. The flap deflection due to impulse gust with the speed of 2m/s increases twice to the one without gust. In this numerical example, results indicate that the bending moment at the blade root is alleviated due to elastic effect.

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Wei, Xiaoyong, Guoguang Jin, Zhan Wei, Boyan Chang, and Yanyan Song. "Dynamics Analysis of the Rigid-Flexible Coupling Lifting Comprehensive Mechanism for a Rotary Dobby." Mathematical Problems in Engineering 2019 (June 4, 2019): 1–14. http://dx.doi.org/10.1155/2019/4896162.

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This paper addresses the problem of dynamics analysis of the rigid-flexible coupling lifting comprehensive mechanism for a rotary dobby, which is the important part of the loom. To provide a physical model basis for a precise dynamics model, the finite element method was used to discretize the bending arm of the rotary dobby effectively. Combining with the modal synthesis techniques, the dynamic model of the bending arm was established by using Kane’s formulation, and it laid a foundation for analyzing the dynamic performance of the heald frame. By comparing virtual prototype simulation results with the numerical calculation results of the bending arm, the correctness of this model was verified. Based on the established dynamic model, the modal truncation method is used to simplify the dynamic model; in addition, the influence of parameters such as the speed of the dobby, the warp tension, the movement distance of the heald frame, and the thickness of the bending arm on the dynamic characteristics of the heald frame was analyzed. Last, the sensitivity analysis (SA) method is used to analyze the effects of each parameter. The results show that it is appropriate to select the first four modes to calculate, and increasing the speed greatly or increasing the warp tension, the shedding performance is obviously worse, while the shedding performance of the loom can be optimized by reducing the shedding range or increasing the thickness of the bending arm.

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Shen, Chun Gen, Gui Cheng Wang, Shu Lin Wang, and Gang Liu. "Analysis and Testing of the Dynamic Performance of Tooling System." Advanced Materials Research 317-319 (August 2011): 1896–901. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1896.

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In this research, a linear-elastic FEM (finite element method) model of tooling system under the unconstrained condition was established for a BT40 tooling system. The natural frequency and the modal shape of the tooling system computed from the FEM analysis were verified against the structural modal parameters obtained from experimental modal analysis. In the basis of rational FEM model of tooling system, the changing law its length and diameter influence to structural modal parameters was investigated. After that, with the machine vibration testing of spindle raising speed idle running, further study on the law about the changing length and diameter of tooling system influence to vibration characteristic of spindle-tool system, the researched results will be a theoretical basis to evaluate the dynamic performance of other type’s tooling system.

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Kashani, H., and A. S. Nobari. "Structural Nonlinearity Identification Using Perturbed Eigen Problem and ITD Modal Analysis Method." Applied Mechanics and Materials 232 (November 2012): 949–54. http://dx.doi.org/10.4028/www.scientific.net/amm.232.949.

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Identification of nonlinear behavior in structural dynamics has been considered here, in this paper. Time domain output data of system are directly used to identify system through Ibrahim Time Domain (ITD) modal analysis method and perturbed eigen problem. Cubic stiffness and Jenkins element, as case studies, are employed to qualify the identification method. Results are compared with Harmonic Balance (HB) estimation of nonlinear dynamic stiffness. Results of ITD based identification are in good agreement with the HB estimation, for stiffness parts of nonlinear dynamic stiffness but for damping parts of nonlinear dynamic stiffness, method needs some additional improvements which are under investigation.

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Song, Xiao Hua, and Shao Long Wu. "Based on ANSYS Workbench High Speed Electricity Spindle Dynamics Characteristic Analysis." Applied Mechanics and Materials 385-386 (August 2013): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.324.

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This paper describes the inherent characteristics, dynamic response and dynamic stability dynamics of vibration capability that impacts of high-speed electric spindle. Taking the high-speed, high-power electric spindle milling center on as the object of the research, modal analyzing of electric spindle with the finite element software ANSYS Workbench, researching the spindle modes, natural frequencies and critical speed of electric spindle, to get each frequency and vibration type, pointed the affection of what spindle away from the anti-vibration frequency requirements, well before bearing stiffness and damping of the vibration to the spindle system. It provides the necessary basis for further dynamic analysis by modal analysis.

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Huang, Zhong Hua, Ya Xie, and Yi Deng. "Hybrid Excavator Shafting Torsional Vibration Analysis." Applied Mechanics and Materials 268-270 (December 2012): 1262–65. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1262.

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Hybrid excavator shafting finite element analysis model was established. Modal calculation results show that compared with traditional excavator, hybrid excavator shafting first modal frequency is decreased significantly. First modal shape and second modal shape are torsional vibration. Hybrid excavator shafting torsional vibration dynamic analysis model was established, dynamic calculation results show that cylinder pressure change is main reason of shafting torsional vibration. Maximum torsional angle is occurred at 2f0. Hybrid excavator shafting torsional vibration experimental table was established and maximum torsional angel experiments under different throttle angle were carried out. Experimental results show that maximum torsional angle is occurred at 2f0 under different rotate speed. Incentive frequency of shafting torsional vibration under different rotate speed is mainly concentrated in 0.5f0~2f0. Main drive source of hybrid power system shafting torsional vibration is diesel engine, not motor.

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Ma, Xue Dong, De Biao Sun, Zheng Dong Su, and Jie Teng. "Finite Element Dynamics Analysis of Vibrating Feeder." Advanced Materials Research 628 (December 2012): 528–31. http://dx.doi.org/10.4028/www.scientific.net/amr.628.528.

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According to actual geometry size of vibrating feeder, the finite element calculating model for vibrating feeder box is established in this paper. ANSYS software is used to perform modal analysis and dynamic strength analysis for the vibration feeder box, and the former ten modal frequencies of the sieving box and dynamic stress of the sieving box whole is obtained, which provides a theoretical basis for strength design of the vibrating feeder.

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Wu, Lan Ying, and Jing Deng. "Modal Analysis of Wire Suspension." Key Engineering Materials 426-427 (January 2010): 451–53. http://dx.doi.org/10.4028/www.scientific.net/kem.426-427.451.

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Wire Suspension is widely used in sensors, especially support the DVD actuator in each of side. The mechanics model of it can be regarded as cantilever beam. The dynamic model of the gear is established by FEM（Finite element method）and modal analyses of the wire suspension are investigated by ANSYS software.

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Liu, Lu Ning, Zhen Yu Shi, Zhan Qiang Liu, and Hao Song. "Modal Analysis of High-Speed Face Milling System Based on Composite Structure System Analysis Method." Materials Science Forum 800-801 (July 2014): 408–13. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.408.

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This paper adopts composite structure system analysis method to perform modal analysis of high-speed face milling cutter which is mounted on the machine tool through FEM modal analysis. The key problem of this method is to obtain joint surface parameters between the machine tool spindle and face milling cutter through experimental modal analysis and MATLAB software. The joint surface parameters consist of linear stiffness, linear damping, rotation stiffness and rotation damping. After getting the frequency response function (FRF) at the tool tip of the face milling system through experimental modal analysis, the contact surface parameters can be used to eliminate the influence of the machine tool to get modal parameters of the face-milling cutter itself. Based on the finite element model of face milling cutter, composite structure system analysis method can be used easily to acquire the dynamic performance of the face milling system through FEM modal analysis, greatly to improve the reliability of modal analysis, and is helpful to the dynamic design and the structure improvement of high speed face milling cutter.

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Dai, Rong, Ji Sheng Ma, and Hua Dong Zhang. "Modal and Strength Analysis on a Gearbox Housing." Advanced Materials Research 154-155 (October 2010): 1379–83. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1379.

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A finite element model for the given gearbox has been established based on NASTRAN, which gives the gearbox theoretical modal analysis results. The dynamic loads of the bearings resulted from kinetic analysis is acted on the gearbox housing and the housing stress distribution under the action of dynamic loads is obtained by the calculation of dynamic strength for the housing. The research results provide a valuable reference for the housing design.

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Wan, Zhong Min, Ka Lin Su, Zu Yi Zheng, et al. "Dynamic Simulation and Analysis of Pipes of Air Conditioners." Applied Mechanics and Materials 303-306 (February 2013): 2790–93. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2790.

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It is essential to investigate the vibration properties of piping system in air conditioner. Finite Element Method is used to build the virtual prototype model of the air conditioner, and the dynamic responding analysis was conducted using ANSYS software. The modal analysis and harmonic response analysis was conducted for different modals and the results was compared. The simulation results showed that the vibration characteristics of modified model is better than that of the original model, thus resonance phenomenon could be avoided.

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Wang, Ai Lun, and Qian Jin Wang. "An Improved Model Reduction Method and its Application in Similar Simulation of Complex Systems." Advanced Materials Research 744 (August 2013): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amr.744.8.

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The model reduction methods aim at simplifying system model while retaining system dynamic behaviors. In this study, an improved high-order system model reduction method based on modal aggregation is proposed, and which is applied to a typical complex mechanical system. Compared with general model reduction methods based on aggregation method, this method derived from the modal matrix can get more accurate aggregation matrix. The research on natural characteristic of gas turbine blade-disk shows that the reduced-order model obtained by modal aggregation method retains the dynamics of original complex system, which verified feasibility and effectiveness of the modal aggregation reduction method and also provided an easy method for similar simulation modeling and dynamic characteristic analysis of high-order complex systems.

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Journal articles on the topic 'Modal dynamic analysis'

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