scholarly journals Research on Spillover Effects for Vibration Control of Piezoelectric Smart Structures by ANSYS

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Xingjian Dong ◽  
Zhike Peng ◽  
Wenming Zhang ◽  
HongXing Hua ◽  
Guang Meng
Keyword(s):  
Finite Element ◽  
Closed Loop ◽  
Parametric Design ◽  
Smart Structures ◽  
Element Model ◽  
Spillover Effects ◽  
Smart Structure ◽  
Control Laws ◽  
Actual Structure ◽  
New Approach

To control vibration of a piezoelectric smart structure, a controller is usually designed based on a reduced order model (ROM) of the system. When such a ROM based controller operates in closed loop with the actual structure, spillover phenomenon occurs because the unmodeled dynamics, which are not included in ROM, will be excited. In this paper, a new approach aiming at investigating spillover effects in ANSYS software is presented. By using the ANSYS parametric design language (APDL), the ROM based controller is integrated into finite element model to provide an accurate representation of what will happen when the controller is connected to the real plant. Therefore, the issues of spillover effects can be addressed in the closed loop simulation. Numerical examples are presented for investigating spillover effects of a cantilever piezoelectric plate subjected to various types of loading. The importance of considering spillover effects in closed loop simulation of piezoelectric smart structures is demonstrated. Moreover, the present study may provide an efficient method especially beneficial for preliminary design of piezoelectric smart structure to evaluate the performance of candidate control laws in finite element environment considering spillover effects.

scholarly journals Closed Loop Finite Element Modeling of Piezoelectric Smart Structures

2006 ◽  
Vol 13 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Guang Meng ◽  
Lin Ye ◽  
Xing-jian Dong ◽  
Ke-xiang Wei
Keyword(s):  
Finite Element ◽  
Closed Loop ◽  
Smart Structures ◽  
State Space Model ◽  
Element Model ◽  
Smart Structure ◽  
Control Law ◽  
Linear Quadratic ◽  
Design Scheme ◽  
Analysis Scheme

The objective of this paper is to develop a general design and analysis scheme for actively controlled piezoelectric smart structures. The scheme involves dynamic modeling of a smart structure, designing control laws and closed-loop simulation in a finite element environment. Based on the structure responses determined by finite element method, a modern system identification technique known as Observer/Kalman filter Identification (OKID) technique is used to determine the system Markov parameters. The Eigensystem Realization Algorithm (ERA) is then employed to develop an explicit state space model of the equivalent linear system for control law design. The Linear Quadratic Gaussian (LQG) control law design technique is employed to design a control law. By using ANSYS parametric design language (APDL), the control law is incorporated into the ANSYS finite element model to perform closed loop simulations. Therefore, the control law performance can be evaluated in the context of a finite element environment. Finally, numerical examples have demonstrated the validity and efficiency of the proposed design scheme. Without any further modifications, the design scheme can be readily applied to other complex smart structures.

Numerical Simulation of Solar Array with Shape Memory Alloy in Active Vibration Control

2010 ◽  
Vol 29-32 ◽  
pp. 589-595
Author(s):  
Yong Liang Zhang ◽  
Shou Gen Zhao ◽  
Lun Long ◽  
Kang Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Shape Memory ◽  
Vibration Control ◽  
Closed Loop ◽  
Active Vibration Control ◽  
Element Model ◽  
Solar Array ◽  
Feedback Signal ◽  
Control Laws

The objective of this study is to develop a general design scheme for shape memory alloys (SMA) intelligent structure. The scheme involves dynamic modeling and closed-loop simulation in a finite element environment. First, the structure of multi-body finite element model simulating the real solar array is established. SMA wire is appended on the model. The physical value of the strain, displacement, velocity and acceleration at the sensors locations separately is acted as the feedback signal. The value is multiplied by the control gain to calculate the voltage inputted to SMA wire. The finite element model is then modified to accept control laws and perform closed-loop simulations. Finally numerical examples have demonstrated the efficiency of the vibration control.

Closed‐loop finite‐element modeling of smart structures—An overview

1999 ◽  
Vol 105 (2) ◽  
pp. 1239-1240
Author(s):  
Vasundara V. Varadan ◽  
Young‐hun Lim ◽  
Senthil V. Gopinathan ◽  
Vijay K. Varadan
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Closed Loop ◽  
Smart Structures ◽  
Element Modeling

Rotor optimization for the improvement of ultrasonic motor performance

2019 ◽  
Vol 233 (19-20) ◽  
pp. 7089-7100 ◽  
Author(s):  
Zhangfan Xu ◽  
Sisi Di ◽  
Song Pan ◽  
Lei Chen ◽  
Weiqing Huang
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Shell Structure ◽  
Motor Performance ◽  
Thin Shell ◽  
Element Model ◽  
Ultrasonic Motor ◽  
Comsol Multiphysics ◽  
New Approach ◽  
The Relationship

The rotor deformation of an ultrasonic motor is an important factor affecting its performance. However, little research focuses on the relationship between the rotor deformation and motor performance. This paper provides an approach to improve the ultrasonic motor's output properties by changing the rotor's size from the view of proper rotor deformation and better stress distribution on the interface. First, a thin shell structure is introduced to study the deformation of the rotor. A finite element model of the motor is built in COMSOL Multiphysics software for the contact analysis of the stress distribution. Then, the optimized ranges of parameters are determined by simulation. Frictional experiments are conducted to verify the feasibility of the rotor under the optimized size. Finally, the performance experiments of a stator corresponding to different sizes of rotor are carried out. The experimental results show that the speed, the power and the efficiency of the optimized rotor are all increase. These results prove the effectivity of the new approach to improving the performance of the ultrasonic motor.

Finite Element Modeling for the Locomotive Traction Gears

2014 ◽  
Vol 889-890 ◽  
pp. 3-8 ◽  
Author(s):  
Xiao Chun Shi ◽  
Wei Dong He ◽  
Jun Hua Bao
Keyword(s):  
Finite Element ◽  
Parametric Design ◽  
Gear Tooth ◽  
Element Model ◽  
Strength Analysis ◽  
Complex Geometries ◽  
Solid Foundation ◽  
Transition Curves ◽  
The Finite Element Model ◽  
Ansys Parametric Design Language

In order to improve the bearing capacity and service life of the locomotive traction gears, modern design methods are used to optimize the gear tooth curves and their parameters. The simulation of the involute tooth curves and tooth root transition curves of the traction gears are build by Ansys Parametric Design Language (APDL). It can accurately describe the finite element model with complex geometries. It laid a solid foundation for the tooth strength analysis and modification.

A Discussion about Finite Element Analysis of Aircraft Wing Structure

2012 ◽  
Vol 532-533 ◽  
pp. 427-430
Author(s):  
Wei Tao Zhao ◽  
Tian Jun Yu ◽  
Yi Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aircraft Design ◽  
Element Model ◽  
Aircraft Wing ◽  
Element Analysis ◽  
Actual Structure ◽  
Shear Plate ◽  
Wing Structure ◽  
Lifting Surfaces

One of the most significant components of aircraft design is the wing, the wings are the main lifting surfaces that support the airplane in flight. The structures of wings must have enough strength and rigidity to ensure the safe of the aircraft. Usually, the displacements of the structures are calculated by using finite element method. But it is very difficult to select a reasonable finite element model to approximate the actual structure. In this study, two models are adopted to calculate the displacements of the wing structure. The first is a model of rod and shear plate, the second is a model of beam and shell. The disadvantages and advantages of two models are discussed. As seen from the comparison with the test date, two models proposed are both feasible to analyze the wing structure.

scholarly journals Numerical and Experimental Study on Integration of Control Actions into the Finite Element Solutions in Smart Structures

2009 ◽  
Vol 16 (4) ◽  
pp. 401-415 ◽  
Author(s):  
L. Malgaca ◽  
H. Karagülle
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Lead Zirconate Titanate ◽  
Smart Structures ◽  
Harmonic Excitation ◽  
Smart Structure ◽  
Displacement Sensor ◽  
Control Actions ◽  
First Case ◽  
Simulation Results

Piezoelectric smart structures can be modeled using commercial finite element packages. Integration of control actions into the finite element model solutions (ICFES) can be done in ANSYS by using parametric design language. Simulation results can be obtained easily in smart structures by this method. In this work, cantilever smart structures consisting of aluminum beams and lead-zirconate-titanate (PZT) patches are considered. Two cases are studied numerically and experimentally in parallel. In the first case, a smart structure with a single PZT patch is used for the free vibration control under an initial tip displacement. In the second case, a smart structure with two PZT patches is used for the forced vibration control under harmonic excitation, where one of the PZT patches is used as vibration generating shaker while the other is used as vibration controlling actuator. For the two cases, modal analyses are done using chirp signals; Control OFF and Control ON responses in the time domain are obtained for various controller gains. A non-contact laser displacement sensor and strain gauges are utilized for the feedback signals. It is observed that all the simulation results agree with the experimental results.

scholarly journals Identification of error factor between actual structure and finite element model through transient response

2020 ◽  
Vol 86 (883) ◽  
pp. 19-00369-19-00369
Author(s):  
Kohei FURUYA ◽  
Takumi ARATANI ◽  
Takuya YOSHIMURA ◽  
Yuichi MATSUMURA
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Transient Response ◽  
Element Model ◽  
Actual Structure ◽  
Error Factor

scholarly journals Validation of a New Aluminum Honeycomb Crush Model With Dynamic Impact Tests

2007 ◽  
Author(s):  
Terry Hinnerichs ◽  
William Scherzinger ◽  
Mike Nielsen ◽  
Tom Carne ◽  
Eric Stasiunas ◽  
...  
Keyword(s):  
Finite Element ◽  
Rate Sensitivity ◽  
Element Model ◽  
Test Results ◽  
Dynamic Impact ◽  
New Approach ◽  
Test Parameters ◽  
Aluminum Honeycomb ◽  
Impact Simulations ◽  
Constitutive Parameters

This paper describes a process for validating a new constitutive model for large, high strain-rate deformation of aluminum honeycomb, called the Honeycomb Crush Model (HCM). This model has 6 yield surfaces that are coupled to account for the orthotropic behavior of the cellular honeycomb being crushed on-axis and off-axis. The HCM has been implemented in the transient dynamic Presto finite element code for dynamic impact simulations. The HCM constitutive parameters were identified based on Presto finite element models that were used to simulate uniaxial and biaxial crush tests of 38 lb/ft3 aluminum honeycomb and reported in an earlier paper. This paper focuses on validating the HCM in the Presto code for application to impact situations that have honeycomb crush velocities up to 85 ft/sec. Also, a new approach for incorporating rate sensitivity into the model is described. A two-stage energy absorber with integrated aluminum honeycomb is described as the configuration for dynamic impact validation experiments. The test parameters and finite element model will be described along with the uncertainty quantification that was done and propagated through the model. Finally, correlation of model predictions and test results will be presented using an energy based validation metric.

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