The Experts below are selected from a list of 50304 Experts worldwide ranked by ideXlab platform
Liying Jiang - One of the best experts on this subject based on the ideXlab platform.
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Molecular dynamics simulation of squeeze-film Damping Effect on nano resonators in the free molecular regime
Physica E-low-dimensional Systems & Nanostructures, 2011Co-Authors: Chuang Feng, Liying JiangAbstract:In this paper, the squeeze-film Damping Effect on the performance of nanoresonators in the free molecular regime is studied by Molecular Dynamics (MD) simulation using a Lennard-Jones potential for intermolecular interactions. The variation of the quality factor (Q-factor) of the nanoresonator with some characteristic parameters for squeeze-film Damping is investigated. By comparing the results of the MD simulation and the existing analytical model it is found that the consideration of gas molecule collisions and diffusive and inelastic collisions between gas molecules and the resonator structure is essential to accurately predict the squeeze-film Damping Effect on the peformance of the nanoresonator. Such Effects are excluded in the existing analytical model which has been evidenced as an overestimation on the performance of resonators according to experimental observations. Therefore, the MD simulation in this work might be very helpful for characterizing the performance and the design of nanoscale resonators with the consideration of the squeeze-film Damping Effect.
Hualing Chen - One of the best experts on this subject based on the ideXlab platform.
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Dynamic analyses of viscoelastic dielectric elastomers incorporating viscous Damping Effect
Smart Materials and Structures, 2016Co-Authors: Junshi Zhang, Jianwen Zhao, Hualing ChenAbstract:In this paper, based on the standard linear solid rheological model, a dynamics model of viscoelastic dielectric elastomers (DEs) is developed with incorporation of viscous Damping Effect. Numerical calculations are employed to predict the Damping Effect on the dynamic performance of DEs. With increase of Damping force, the DEs show weak nonlinearity and vibration strength. Phase diagrams and Poincare maps are utilized to detect the dynamic stability of DEs, and the results indicate that a transition from aperiodic vibration to quasi-periodic vibration occurs with enlargement of Damping force. The resonance properties of DEs including Damping Effect are subsequently analyzed, demonstrating a reduction of resonant frequency and resonance peak with increase of Damping force.
Chuang Feng - One of the best experts on this subject based on the ideXlab platform.
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Molecular dynamics simulation of squeeze-film Damping Effect on nano resonators in the free molecular regime
Physica E-low-dimensional Systems & Nanostructures, 2011Co-Authors: Chuang Feng, Liying JiangAbstract:In this paper, the squeeze-film Damping Effect on the performance of nanoresonators in the free molecular regime is studied by Molecular Dynamics (MD) simulation using a Lennard-Jones potential for intermolecular interactions. The variation of the quality factor (Q-factor) of the nanoresonator with some characteristic parameters for squeeze-film Damping is investigated. By comparing the results of the MD simulation and the existing analytical model it is found that the consideration of gas molecule collisions and diffusive and inelastic collisions between gas molecules and the resonator structure is essential to accurately predict the squeeze-film Damping Effect on the peformance of the nanoresonator. Such Effects are excluded in the existing analytical model which has been evidenced as an overestimation on the performance of resonators according to experimental observations. Therefore, the MD simulation in this work might be very helpful for characterizing the performance and the design of nanoscale resonators with the consideration of the squeeze-film Damping Effect.
Tianlong Pan - One of the best experts on this subject based on the ideXlab platform.
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Research on the impact of surface properties of particle on Damping Effect in gear transmission under high speed and heavy load
Mechanical Systems and Signal Processing, 2018Co-Authors: Wangqiang Xiao, Zhiwei Chen, Tianlong PanAbstract:Abstract The vibration and noise from gear transmission have great damage on the mechanical equipment and operators. Through inelastic collisions and friction between particles, the energy can be dissipated in gear transmission. A dynamic model of particle dampers in gear transmission was put forward in this paper. The performance of particle dampers in centrifugal fields under different rotational speeds and load was investigated. The surface properties such as the impact of coefficient of restitution and friction coefficient of the particle on the Damping Effect were analyzed and the total energy loss was obtained by discrete element method (DEM). The vibration from time-varying mesh stiffness was Effectively reduced by particle dampers and the optimum coefficient of restitution was discovered under different rotational speeds and load. Then, a test bench for gear transmission was constructed, and the vibration of driven gear and driving gear were measured through a three-directional wireless acceleration sensor. The research results agree well with the simulation results. While at relatively high speed, smaller coefficient of restitution achieves better Damping Effect. As to friction coefficient, at relatively high speed, the energy dissipation climbs up and then declines with the increase of the friction coefficient. The results can provide guidelines for the application of particle damper in gear transmission.
Karoly C Kocsis - One of the best experts on this subject based on the ideXlab platform.
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quantifying the thermal Damping Effect in underground vertical shafts using the nonlinear autoregressive with external input narx algorithm
International journal of mining science and technology, 2019Co-Authors: Pedram Roghanchi, Karoly C KocsisAbstract:Abstract As air descends the intake shaft, its infrastructure, lining and the strata will emit heat during the night when the intake air is cool and, on the contrary, will absorb heat during the day when the temperature of the air becomes greater than that of the strata. This cyclic phenomenon, also known as the “thermal Damping Effect” will continue throughout the year reducing the Effect of surface air temperature variation. The objective of this paper is to quantify the thermal Damping Effect in vertical underground airways. A nonlinear autoregressive time series with external input (NARX) algorithm was used as a novel method to predict the dry-bulb temperature (Td) at the bottom of intake shafts as a function of surface air temperature. Analyses demonstrated that the artificial neural network (ANN) model could accurately predict the temperature at the bottom of a shaft. Furthermore, an attempt was made to quantify typical “Damping coefficient” for both production and ventilation shafts through simple linear regression models. Comparisons between the collected climatic data and the regression-based predictions show that a simple linear regression model provides an acceptable accuracy when predicting the Td at the bottom of intake shafts.
