Mechanical Modeling of an Actuated Platform for Precision Pointing Control - Via Finite-element Analysis and Normal Mode Analysis

2012 ◽  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Mode Analysis ◽  
Mechanical Modeling ◽  
Element Analysis ◽  
Pointing Control

Identification of a Significantly Non-Proportionally Damped Structure Using Force Appropriation

1995 ◽  
Author(s):  
P. S. Holmes ◽  
J. R. Wright ◽  
J. E. Cooper
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Normal Mode ◽  
Normal Modes ◽  
Dynamic Tests ◽  
High Quality ◽  
Element Analysis ◽  
Standard Curve ◽  
Complex Modes ◽  
Phase Resonance

Abstract Dynamic tests were carried out on an aluminium plate with significant non-proportional damping applied via two oil filled dampers. Normal mode force appropriation (phase resonance) methods were used to measure the undamped normal modes of the plate and the results compared with corresponding complex modes obtained using a standard curve fitting (phase separation) approach. It is demonstrated that, as long as suitable excitation positions are chosen, high quality undamped normal modes can be identified while the curve fitted modes are highly complex. A Finite Element analysis of the plate was used to show how the results of normal mode force appropriation are directly comparable, particularly when damping is non-proportional.

Finite Element Analysis of a Steel Spiral Staircase with Multiple Supports

2011 ◽  
Vol 255-260 ◽  
pp. 1964-1967
Author(s):  
Tao Chen ◽  
Hua Dong He
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Mode Analysis ◽  
Complex Geometries ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Linear Elastic ◽  
Moment Distribution ◽  
Spiral Staircase

This paper presents finite element analyses of a steel spiral staircase with multiple supports. The complex geometries were modeled using commercial finite element method (FEM) software. Linear elastic analyses were carried out to investigate its deformation and moment distribution. Besides these, mode analysis was also performed to explore its pedestrian comfort. Finally the reliability of the structure is proved.

Viscoelasticity of cross-linked actin networks: Experimental tests, mechanical modeling and finite-element analysis

2013 ◽  
Vol 9 (7) ◽  
pp. 7343-7353 ◽  
Author(s):  
Michael J. Unterberger ◽  
Kurt M. Schmoller ◽  
Christine Wurm ◽  
Andreas R. Bausch ◽  
Gerhard A. Holzapfel
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Tests ◽  
Mechanical Modeling ◽  
Element Analysis ◽  
Actin Networks

scholarly journals Finite Element Modelling and Updating of a Thin Plate Structure using Normal Mode Analysis

2021 ◽  
Vol 1062 (1) ◽  
pp. 012059
Author(s):  
A R Bahari ◽  
M A Yunus ◽  
M N Abdul Rani ◽  
W I I Wan Iskandar Mirza ◽  
M A S Aziz Shah ◽  
...  
Keyword(s):  
Finite Element ◽  
Normal Mode ◽  
Thin Plate ◽  
Finite Element Modelling ◽  
Normal Mode Analysis ◽  
Mode Analysis ◽  
Element Modelling ◽  
Plate Structure

Design on Structural Test and Modeling of the Mounting Structure of a GTF Aircraft Engine

2014 ◽  
Vol 607 ◽  
pp. 358-361 ◽  
Author(s):  
Yong Hao ◽  
Zhi Tao
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Normal Mode ◽  
Normal Mode Analysis ◽  
Aircraft Engine ◽  
Mode Analysis ◽  
Fe Modeling ◽  
System A ◽  
Structural Test

A mounting system of a geared turbofan (GTF) engine is presented. It play a static determined structure when connecting the engine and aircraft pylon. To conduct the test on the mounting system a fake engine body is designed. The experiment setup is also demonstrated. The finite element (FE) modeling on the mounting system is studied using MSC/NASTRAN and then the main parameters of key parts are given. The presented method is validated with static analysis. A normal mode analysis of the model also shows that it can be adopted in the dynamical design.

scholarly journals A New Concept Compliant Platform with Spatial Mobility and Remote Actuation

2019 ◽  
Vol 9 (19) ◽  
pp. 3966 ◽  
Author(s):  
Nicola Pio Belfiore
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rigid Body ◽  
Mode Analysis ◽  
Spatial Mobility ◽  
Element Analysis ◽  
Remote Actuation ◽  
Elastic Joints ◽  
Monolithic Structure ◽  
Surgical Operations

This paper presents a new tendon-driven platform with spatial mobility. The system can be obtained as a monolithic structure, and its motion is based on the concept of selective compliance. The latter contributes also to optimizing the use of the material by avoiding parasitic deformations. The presented platform makes use of lumped compliance with three different kinds of elastic joints. An analysis of the platform mobility based on finite element analysis is provided together with an assembly mode analysis of the equivalent pseudo-rigid body mechanism. Surgical operations in laparoscopic environments are the natural fields of applications for this device.

Preprocessing and Solving Finite Element Analysis for NVH Prediction

2013 ◽  
Vol 471 ◽  
pp. 45-51
Author(s):  
Mohamad Helmi Bin Talib ◽  
Nurulakmar Abu Husain ◽  
Zaidi Farouk Bin Fauzi
Keyword(s):  
Finite Element ◽  
Acoustic Analysis ◽  
Early Stage ◽  
Normal Mode Analysis ◽  
Mode Analysis ◽  
Design Decision ◽  
Element Analysis ◽  
Vehicle Modeling ◽  
Noise Transfer Function ◽  
Cae Simulation

Current vehicle development period has become shorter; therefore, virtual testing has been considered as vital to assist design decision at the early stage of the development. Over the last three decades, Finite Element Method (FEM) is widely used to predict the Noise and Vibration level of a vehicle. With the latest technology of Computer Aided Engineering (CAE) simulation, the calculation time taken for NVH analysis can be reduced from few days to only few hours. This paper presents current simulation technique for automotive development using Altair Hyperworks as preprocessing tool for vehicle modeling as well as application of NASTRAN as calculation solver. Normal Mode analysis is conducted on the Trimmed Body to investigate the natural frequency of the steering and the vehicle resonance. The result obtained is comparable with the actual prototype testing result to present the level of correlation. Coupling structural-acoustic analysis also conducted to predict the Noise Transfer Function (NTF) at the driver's ear.

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