Facilitating Performance Optimization of RF PCB Designs by using Parametric Finite-Element Component Models

2012 ◽  
Author(s):  
John Rohde ◽  
Thomas S. Toftegaard
Keyword(s):  
Finite Element ◽  
Performance Optimization ◽  
Component Models ◽  
Rf Pcb

Finite Element Analysis of the Distributed Vibration Absorbers for Structural Noise Control

2005 ◽  
Author(s):  
Ashwini Gautam ◽  
Chris Fuller ◽  
James Carneal
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Base Plate ◽  
Element Model ◽  
Fe Model ◽  
Vibration Absorbers ◽  
Element Analysis ◽  
Poroelastic Media ◽  
Hexahedral Elements ◽  
Component Models

This work presents an extensive analysis of the properties of distributed vibration absorbers (DVAs) and their effectiveness in controlling the sound radiation from the base structure. The DVA acts as a distributed mass absorber consisting of a thin metal sheet covering a layer of acoustic foam (porous media) that behaves like a distributed spring-mass-damper system. To assess the effectiveness of these DVAs in controlling the vibration of the base structures (plate) a detailed finite elements model has been developed for the DVA and base plate structure. The foam was modeled as a poroelastic media using 8 node hexahedral elements. The structural (plate) domain was modeled using 16 degree of freedom plate elements. Each of the finite element models have been validated by comparing the numerical results with the available analytical and experimental results. These component models were combined to model the DVA. Preliminary experiments conducted on the DVAs have shown an excellent agreement between the results obtained from the numerical model of the DVA and from the experiments. The component models and the DVA model were then combined into a larger FE model comprised of a base plate with the DVA treatment on its surface. The results from the simulation of this numerical model have shown that there has been a significant reduction in the vibration levels of the base plate due to DVA treatment on it. It has been shown from this work that the inclusion of the DVAs on the base plate reduces their vibration response and therefore the radiated noise. Moreover, the detailed development of the finite element model for the foam has provided us with the capability to analyze the physics behind the behavior of the distributed vibration absorbers (DVAs) and to develop more optimized designs for the same.

Research on Mechanical Structure Optimization Oriented to Dynamic Characteristics

2010 ◽  
Vol 33 ◽  
pp. 533-538
Author(s):  
Miao Hu ◽  
Tai Yong Wang ◽  
Shuai Yang ◽  
Zhi Feng Qiao ◽  
Dian Peng Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Optimization ◽  
Dynamic Performance ◽  
Fem Simulation ◽  
Dynamic Test ◽  
Structure Optimization ◽  
Test Analysis ◽  
Basic Principles ◽  
Dynamic Design

Basic principles of dynamic design were proposed for the characteristics of machine dynamic performance. Take some curved-tooth bevel gear generator as research object. Its dynamic performance was analyzed and structure was optimized through theoretical analysis, finite element method (FEM) simulation and dynamic test analysis. Results show that these principles are suitable for dynamic performance optimization and design of machine tool.

scholarly journals Geometry Investigation and Performance Optimization of a Single-Mass Piezoelectric 6-DOF IMU

2020 ◽  
Vol 10 (5) ◽  
pp. 6282-6289
Author(s):  
H. Almabrouk ◽  
B. Mezghani ◽  
G. Agnus ◽  
S. Kaziz ◽  
Y. Bernard ◽  
...  
Keyword(s):  
Finite Element ◽  
Performance Optimization ◽  
Angular Rate ◽  
Linear Acceleration ◽  
Longitudinal Axis ◽  
Element Model ◽  
Measurement Unit ◽  
Optimized Design ◽  
Element Analysis ◽  
Single Mass

This paper explores the fundamental steps towards the development of a 6-axis piezoelectric Inertial Measurement Unit (IMU). The main specification of the reported device is its ability to concurrently detect 3-axis acceleration and angular velocity using a single mass-based design. This work represents a detailed numerical analysis based on a finite element model. Experimental reported data are exploited to validate the FEM model in terms of acceleration detection which is ensured through the direct piezoelectric effect. The angular rate is detected thanks to the Coriolis effect by ensuring drive and sense modes. Using a Finite Element Analysis (FEA), light was shed on the different basic parameters that influence the sensor performance in order to present an optimized design. A detailed geometrical investigation of factors such as anchor position, optimized locations for sensing electrodes, proof-mass dimensions, PZT thickness, and operating frequency is illustrated. The 6-DOF sensor outputs are extracted in terms of the original and the optimized design. The amelioration rate of sensitivity is found to be up to 165% for linear acceleration, while for angular rate sensing, the lateral sensitivity is ameliorated by about 330% and is multiplied by around ten times in the normal axis. The optimized design exhibits a good acceleration sensitivity of 260mV/g in the lateral axis and 60.7mV/g in the z-axis. For angular rate sensing, the new design is more sensitive along the longitudinal axis than the lateral one. Sensitivity values are found to be 2.65µV/rad/s for both x-and y-axis, and 1.24V/rad/s for the z-axis.

Modular Dynamic Model Assembly of Finite Element Models

2008 ◽  
Author(s):  
Zhen Ren ◽  
Clark J. Radcliffe
Keyword(s):  
Finite Element ◽  
Engineering Design ◽  
Analytical Models ◽  
Physical Systems ◽  
Modular Model ◽  
Global Engineering ◽  
Material Component ◽  
Component Models ◽  
Mesh Node ◽  
Global Activity

Analytical engineering design is a global activity requiring efficient global distribution of analytical models of dynamic physical systems through computer networks. Finite Element Method (FEM) models are used globally to analyze the response of physical systems assembled from physical components. FEM models from different physical component suppliers often have geometrically incompatible meshes. This geometric incompatibility of mesh node placement typically requires component internal details in the assembly process. The modular model assembly introduced in this paper does not require such component internal details. It assembles incompatible finite element component models fast and with accuracy comparable to traditional reformulation. The proprietary geometry and material component details are not revealed during the assembly. Modular model assembly can be used to assemble distributed component models through the internet in global engineering design. Dynamic examples are provided.

Modelling of continuous crushing of ice in front of offshore structures

1995 ◽  
Vol 22 (3) ◽  
pp. 544-550 ◽  
Author(s):  
T. G. Brown ◽  
U. A. Morsy
Keyword(s):  
Finite Element ◽  
Plastic Material ◽  
Crack Density ◽  
Offshore Structures ◽  
Rate Theory ◽  
Theory Approach ◽  
The Finite Element Method ◽  
Dimensional Finite Element ◽  
Finite Element Package ◽  
Component Models

A one-dimensional finite element is developed to represent the continuous crushing and extrusion of ice in interactions with offshore structures. The element is developed with the objective of providing a model for the analysis of dynamic ice–structure interactions in which both nonsimultaneous and phase-locked behaviours occur. The element has two components: one to model the damage accumulation in intact ice and one to model the extrusion of pulverized ice between the intact ice and the structure. The intact but damaging ice behaviour is based on a rate theory approach to crack density and damaged material compliance which is a function of stress and damage. The extrusion component models a viscous-plastic material which is modelled using a Tresca failure criterion and viscous flow. The element is developed as part of an existing finite element package (Abaqus) through its user material and user element capabilities. The paper describes in detail the development and implementation of the element and presents sample results of its performance in continuous crushing interactions with a rigid structure. The results show that the element can be used as the interface between moving intact ice sheets and offshore structures modelled using the finite element method. Key words: ice, structures, dynamics, finite elements, rheology.

Nonlinear Finite-Element Analysis of Dual Support Breakaway Sign

1996 ◽  
Vol 1528 (1) ◽  
pp. 146-154 ◽  
Author(s):  
Gene W. Paulsen ◽  
John D. Reid
Keyword(s):  
Finite Element ◽  
Cost Effective ◽  
System Model ◽  
Element Analysis ◽  
Small Component ◽  
Sign System ◽  
Vehicle Crash ◽  
Effective Manner ◽  
Component Models ◽  
Crash Tests

Breakaway supports are common devices used for dual support signs located along the roadway. Design of these systems often involves several costly vehicle crash tests to ensure their effectiveness. It is believed that mathematical modeling can be used to help develop new sign systems in a more timely and cost-effective manner. To this end, a dual support breakaway sign system was successfully modeled using LS-DYNA3D, a nonlinear, large deformation finite-element package. Small component models were first constructed on critical parts of the breakaway sign system. The component models were compared with physical component tests to aid in the development process, as well as to validate the results. The components were then assembled into a complete system model. Very few changes were made in the complete sign model, because problems were worked out in component modeling. Results from two full-scale vehicle crash tests were used to validate the system model. With successful results, the model can now be used to study various sign modifications and configurations.

Development of a General Component-Based Connection Element for Structural Fire Engineering Analysis

2015 ◽  
Vol 6 (4) ◽  
pp. 247-254 ◽  
Author(s):  
Gang Dong ◽  
Ian Burgess ◽  
Buick Davison ◽  
Ruirui Sun
Keyword(s):  
Finite Element ◽  
General Purpose ◽  
Fire Engineering ◽  
Tension And Compression ◽  
Connection Component ◽  
The University ◽  
Component Models ◽  
In Fire ◽  
Steel Joints ◽  
Structural Fire Engineering

This paper reports on the development of a general-purpose Eurocode-compliant component-based connection finite element for steel-to-steel joints in fire. The development begins by utilising the temperature-dependent connection component characteristics previously developed at the University of Sheffield to create a component-based connection finite element to model flush endplate connections. Subsequently the element was extended to a new connection type with high ductility, the reverse channel. The component models have been developed for the reverse channel under tension and compression. The element has been incorporated into the nonlinear global structural analysis program Vulcan, in which it has been used along with a static-dynamic formulation. The use of the element is illustrated by modelling a fire test at the University of Manchester in which reverse channel connections were used.

Composite Joints Design - Migrating from Finite Element Models to Component Models

2013 ◽  
Vol 716 ◽  
pp. 620-625
Author(s):  
Wan Hu Jong ◽  
Woong Park Ji
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Difficult Problem ◽  
Finite Element Models ◽  
Physical Testing ◽  
New Type ◽  
And Performance ◽  
Partially Restrained ◽  
Component Models ◽  
Connection Design

When developing innovative structural systems, designers are faced with a difficult problem when addressing connection design. While the provisions for the design of members and their failure modes are well understood and codified, the design and performance of the connections are not. Current specifications require designers to provide evidence, through either experiments or analysis and combinations thereof, that these connections will perform as intended. In this paper, the design of an innovative type of connection to concrete-filled tube columns is described. These connection are partially-restrained, contain a new type of material (shape memory alloys), and are geared for high seismic loads making their design a very challenging proposition without the aid of physical testing. The design is developed based on detailed finite element analyses of the connection region and elements which lead to simplified spring models suitable for design of entire frames. The results indicate that through careful and rigorous analyses, robust simplified connection models can be developed even for complex connections.

Design of Radio Frequency (RF) MEMS Switches: Modeling

2003 ◽  
Author(s):  
Yong Zhu ◽  
Horacio D. Espinosa
Keyword(s):  
Finite Element ◽  
Performance Optimization ◽  
Rf Mems ◽  
Capacitive Coupling ◽  
Analytical Models ◽  
Design Parameters ◽  
Electrostatic Actuators ◽  
Practical Applications ◽  
Mems Switches ◽  
Rf Mems Switches

Mechanical modeling of RF MEMS switches is important for performance optimization and device reliability. 1-D, 2-D, and 3-D linear analytical models have been proposed to analyze the electrostatic pull-in of a fixed-fixed beam at small deflection. However, most RF MEMS switch structures work at large deflection range. In this paper, 1-D, 2-D, and 3-D nonlinear analytical models suitable for large structural deflection are developed in a generalized form. In some practical applications, finite element models are required to account for the effects of all the design parameters: switch geometry, non-uniform state of residual stress, temperature and etc. A 3-D finite element model between structural, electrical and thermal domains is developed. This 3-D model is applicable to the design of all types of electrostatic actuators, though that of a capacitive coupling switch was examined.

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