Design and Optimization of FBAR Filter Using Acoustic-Electromagnetic Coupling Model and MBVD Model

2020 ◽  
Author(s):  
Shitao Chen ◽  
Qiupeng Yin ◽  
Cong Hu ◽  
Zhixiang Huang
Keyword(s):  
Electromagnetic Coupling ◽  
Coupling Model ◽  
Design And Optimization

scholarly journals Multifield Coupling Model and Performance Analysis of a Hydrostatic Mechanical Seal

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5159
Author(s):  
Guiyue Kou ◽  
Xinghu Li ◽  
Yan Wang ◽  
Chunsen Tan ◽  
Kanran Zhou ◽  
...  
Keyword(s):  
Fluid Pressure ◽  
Coupling Model ◽  
Outer Diameter ◽  
Mechanical Seal ◽  
Design And Optimization ◽  
Seal Design ◽  
Mechanical Deformations ◽  
Deformation State ◽  
Inner Diameter ◽  
And Performance

A two-dimensional axisymmetric thermal-fluid-solid coupled mathematical model of a contact mechanical seal is established. The finite difference method is used to solve the control equations for the fluid pressure and temperature of the seal end face, and the finite element method is used to determine the thermal deformation state of the seal. The seal’s performance at different working speeds was studied and verified by experiments. The results show that under the combined actions of thermal and mechanical deformations, the seal end face forms a convergent leakage gap from the outer diameter to the inner diameter. The minimum film thickness is observed on the inner diameter side of the seal end face, and the highest end face temperature coincides with this location. With increasing working speed, the contact force at the inner diameter side increases, the temperature difference between the inner diameter and the outer diameter of the end face increases, and the leakage rate correspondingly increases. The numerical simulation results are in good agreement with the experimental results. The model and calculation method can be applied to other forms of mechanical seal design and optimization.

Nonlinearity Mode Theory Foundation Research of EMP Coupling by Volterra Series

2014 ◽  
Vol 511-512 ◽  
pp. 1022-1026
Author(s):  
Yong Sheng Gao ◽  
Sha Wu ◽  
Jiu He Ma ◽  
Jiu Liang Xiong
Keyword(s):  
Volterra Series ◽  
Electromagnetic Coupling ◽  
Nonlinear Behavior ◽  
Coupling Model ◽  
Kernel Functions ◽  
Volterra Kernel ◽  
Coupling Process ◽  
Electric System ◽  
Model Research ◽  
Theory Foundation

Strong Electromagnetic Pulses (EMP) as a new idea weapon has caused many effects like malfunctions, performance degradation, interferences, and destructions in electronic and electrical systems. EMP coupling model research is the foundation of effect evolution and protection. In this paper, a new modeling method on the base of combination system identification theory and Volterra series algorithm was utilized to analyze the electromagnetic coupling process from an external field to an inner electric system. First, we will analyze the theory foundation of non-parameters model evolution. And then, using input and output test data, we presented commonly Voleterra series expression of EMP electromagnetic coupling model. Then, we analyze coupling models several important characteristics in detail. Finally, we approach High Order Spectrum algorithms to identify Volterra kernel functions. Theoretical results show that the Volterra kernel function will be used as an efficient method in EMP coupling model research and can apply this method to character the nonlinear behavior of the EMP electromagnetic coupling. The model described above was assigned under certain assumptions, moreover describes the effects in theory only and does not consider the time variation of the parameters of the system. From this reason it appears as more convenient to characterize the electromagnetic coupling process, by a more universal mathematical approach.

scholarly journals A Study on the Dynamic Transmission Law of Spiral Drum Cutting Coal Rock Based on ANSYS/LS-DYNA Simulation

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Lijuan Zhao ◽  
Hongmei Liu ◽  
Wenchao Zhou
Keyword(s):  
Stress Distribution ◽  
Maximum Stress ◽  
Coupled Model ◽  
Time History ◽  
Coupling Model ◽  
Working Process ◽  
Obvious Effect ◽  
Design And Optimization ◽  
Plastic Domain ◽  
Coal Rock

The ANSYS/LS-DYNA software has been used in this paper to establish the coal rock coupling model. A dynamic simulation of the cutting process was used to analyze the variation of the load. Based on the dynamic analysis of the coal and rock that were cut by the spiral drum, the stress cloud diagram of the coupled model of the spiral drum and the coal and the plastic domain evolution law of the coal and the rock were obtained from the coal to the rock. The time history curves of the parameters, such as the stress and strain of the drum and the pick, were obtained, and the stress distribution of the spiral drum during the working process was ascertained. The results showed that when the spiral drum cuts the interface between the coal and the rock, the coal and the rock collapsed and the working load fluctuated. Changing the traction speed in order to change the rotational speed of the drum had a more obvious effect on the load and the stress on the drum. Through the use of simulation, the stress distribution cloud diagram of the drum was obtained. The study has shown that the stress on the end plate was significantly higher than that on the cutting blade. The maximum stress acting on the alloy head was 1209.26 MPa. This study has provided a basis for the design and optimization of the drum with regard to reliability.

Numerical Coupling Analysis of Droplets’ Behaviors in GMAW

2010 ◽  
Vol 139-141 ◽  
pp. 981-985
Author(s):  
Yan Lu Huang ◽  
Xin You Ke ◽  
Yi Bin Li
Keyword(s):  
Electric Current ◽  
Current Density ◽  
Electromagnetic Force ◽  
Electromagnetic Coupling ◽  
Gas Metal Arc Welding ◽  
Coupling Model ◽  
Metal Transfer ◽  
Electric Current Density ◽  
Forming Process ◽  
Metal Arc Welding

The forming process and dynamic behaviors of droplets in gas metal arc welding (GMAW) were numerically simulated by using weak electromagnetic coupling method, with considering the gravity, the electromagnetic force, the free surface and the turbulent flow in the droplets. The shape update of the droplets was calculated on basis of VOF and CSF theories. The Gaussian electric current density was identified as boundary conditions for calculating electromagnetic force. A weak electromagnetic coupling model was used to study the characteristics of relevant physical variables and their roles in metal transfer. The simulation results suggest that the maximal value of electric current density lies in the neck of droplets, and the electromagnetic force has great effects of accelerating droplets’ contraction and shortening their falling time. Under the action of strong electromagnetic force, the metal transfer is in a spray form rather than a globular one in GMAW process. The simulated results agree well with theoretical analyses and predecessors’ experiments.

Numerical Study on Heat Exchange Characteristics of Runways with Snow-Melting System Using Geothermal Sources

2014 ◽  
Vol 509 ◽  
pp. 141-146 ◽  
Author(s):  
Jing Cui ◽  
Yu Peng Liang ◽  
Yong Hui Guo ◽  
Xue Bin Zhao ◽  
Si Yue Ma ◽  
...  
Keyword(s):  
Temperature Field ◽  
Numerical Study ◽  
Phase Interface ◽  
Reference Value ◽  
Coupling Model ◽  
Ambient Conditions ◽  
Snow Melting ◽  
Design And Optimization ◽  
System Parameters ◽  
Selection Of

In this paper, a wall-soil-snow coupling model was established and the mechanism to heat melting system was analyzed. The temperature field and the phase interface moving rule in the process of melting snow were obtained.The selection of system parameters (ambient conditions, diameter, buried depth, pipeline pitch) were studied as well. These results have important reference value for design and optimization of heat source snow-melting system.

scholarly journals On Well-Posedness for a Piezo-Electromagnetic Coupling Model with Boundary Dynamics

2017 ◽  
Vol 17 (3) ◽  
pp. 499-513 ◽  
Author(s):  
Rainer Picard
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Boundary Data ◽  
Electromagnetic Coupling ◽  
Coupled System ◽  
Coupling Model ◽  
Model System ◽  
Material Behavior ◽  
Well Posedness ◽  
Boundary Dynamics

AbstractWe consider a coupled system of Maxwell’s equations and the equations of elasticity, which is commonly used to model piezo-electric material behavior. The boundary influence is encoded as a separate dynamics on the boundary data spaces coupled to the partial differential equations. Evolutionary well-posedness, i.e. Hadamard well-posedness and causal dependence on the data, is shown for the resulting model system.

Dynamics Simulation of Beam-Carried Cranes Based on Virtual Prototyping

2011 ◽  
Vol 130-134 ◽  
pp. 1105-1108 ◽  
Author(s):  
Kai An Liu ◽  
Qiu Ju Li
Keyword(s):  
Virtual Prototyping ◽  
Coupling Model ◽  
Structure Design ◽  
Dynamics Simulation ◽  
Order System ◽  
Response Curves ◽  
Flexible Coupling ◽  
Design And Optimization ◽  
Collaborative Simulation ◽  
System Transfer Function

Firstly this paper introduces the flexibility theory of virtual prototyping. Secondly a virtual prototype of rigid-flexible coupling model for beam-carried cranes is built, based on collaborative simulation platform by using the software of UG, ADAMS and ANSYS. Finally the response curves of the displacement for the girder’s centroid with step load and different frequency sine load were analyzed by virtual prototyping simulation. And the corresponding second-order system transfer function is given through the system identification. The result of simulation provided some theory basis for the structure design and optimization of beam-carried cranes.

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