Structural Modal Analysis of a New Twin-Rotor Piston Engine

2013 ◽  
Vol 390 ◽  
pp. 256-260 ◽  
Author(s):  
Qiang Xie ◽  
Cun Yun Pan ◽  
Hu Chen ◽  
Zheng Zhou Zhang ◽  
Lei Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Vibration ◽  
Structural Parameters ◽  
Vibration Reduction ◽  
Modal Parameters ◽  
Analysis Software ◽  
Piston Engine ◽  
Radiation Noise ◽  
Twin Rotor

With the finite analysis software ANSYS, the key parts and the whole structure of a new twin-rotor piston engine is analyzed, and then the structural modal parameters are obtained by using finite element method in the cases of free modality. Furthermore, the natural vibration characteristics of the twin-rotor piston engine are analyzed, as well as the influence of structural parameters on vibration transfer and radiation noise. The research is expected to lay a foundation for the vibration reduction design of the twin-rotor piston engine.

Dynamic Analysis and Optimization Design on Storage Silo of Concrete Mixing Plant

2012 ◽  
Vol 204-208 ◽  
pp. 1062-1065
Author(s):  
Xin Xiang Zhou ◽  
Yan Ling Tang ◽  
Cheng Liu ◽  
Guang Yu Hu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimization Design ◽  
Natural Vibration ◽  
Modal Parameters ◽  
Three Dimension ◽  
Research Subject ◽  
Distribution Characteristics ◽  
Vibration Period ◽  
Main Research

This paper takes the under-frame of 300t storage silo produced by a certain company as the main research subject, modal analysis on the under-frame is made by three-dimension finite element method to obtain the basic natural vibration period,modal parameters and the distribution characteristics of the overall stiffness.The best optimal design can be got through the optimization design of the under-frame.All of the above provide a reliable reference for the design of storage silo.

Dynamic Instability of Delaminated Composite Plates under Parametric Excitation

2006 ◽  
Vol 326-328 ◽  
pp. 1765-1768 ◽  
Author(s):  
Meng Kao Yeh ◽  
Kuei Chang Tung
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Parametric Excitation ◽  
Composite Plate ◽  
Dynamic Instability ◽  
Composite Plates ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Electromagnetic Device ◽  
Instability Regions

The dynamic instability behavior of delaminated composite plates under transverse excitations was investigated experimentally and analytically. An electromagnetic device, acting like a spring with alternating stiffness, was used to parametrically excite the delaminated composite plates transversely. An analytical method, combined with the finite element method, was used to determine the instability regions of the delaminated composite plates based on the modal parameters of the composite plate and the position, the stiffness of the electromagnetic device. The delamination size and position of composite plates were varied to assess their effects on the excitation frequencies of simple and combination resonances in instability regions. The experimental results were found to agree with the analytical ones.

Research on Seismic Displacement Response of Cable Stayed Bridge without Back Stays

2014 ◽  
Vol 919-921 ◽  
pp. 1039-1042
Author(s):  
Liang Lv ◽  
Bin Liang ◽  
Wen Sheng Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seismic Wave ◽  
Natural Vibration ◽  
Peak Displacement ◽  
Seismic Displacement ◽  
Displacement Response ◽  
Cable Stayed Bridge ◽  
Element Method ◽  
Design And Construction

Seismic displacement response of cable stayed bridge without back stays was studied in this paper. Based on the cable stayed bridge without back stays on Zhenshui Road in Xinmi City, finite element method (FEM) was applied to calculate and analyze natural vibration and peak displacement response of the structure. The results show that with regard to mid-span and consolidation of pier and main tower, uniaxial seismic wave input results in peak displacement response of corresponding direction is bigger than that of any other direction. Peak displacement response of the top of the main tower is bigger than those of mid-span and consolidation of pier and main tower in any seismic wave input cases, which indicates that the top of the tower needs to be focused in the process of design and construction. Seismic wave along triaxial direction has the biggest impact on the structure. Keywords: cable stayed bridge without back stays; seismic displacement response; seismic wave input; peak displacement response

Fatigue damage in bending of reinforced concrete frames using non-destructive tests for dynamic strength of the cylinder

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dragan D. Milašinović ◽  
Aleksandar Landović ◽  
Danica Goleš
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Damage ◽  
Cross Section ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Concrete Frames ◽  
Content Type ◽  
Non Destructive

PurposeThe purpose of this paper is to contribute to the solution of the fatigue damage problem of reinforced concrete frames in bending.Design/methodology/approachThe problem of fatigue damage is formulated based on the rheological–dynamical analogy, including a scalar damage variable to address the reduction of stiffness in strain softening. The modal analysis is used by the finite element method for the determination of modal parameters and resonance stability of the selected frame cross-section. The objectivity of the presented method is verified by numerical examples, predicting the ductility in bending of the frame whose basic mechanical properties were obtained by non-destructive testing systems.FindingsThe modal analysis in the frame of the finite element method is suitable for the determination of modal parameters and resonance stability of the selected frame cross-section. It is recommended that the modulus of elasticity be determined by non-destructive methods, e.g. from the acoustic response.Originality/valueThe paper presents a novel method of solving the ductility in bending taking into account both the creep coefficient and the aging coefficient. The rheological-dynamical analogy (RDA) method uses the resonant method to find material properties. The characterization of the structural damping via the damping ratio is original and effective.

Damage detection based on system identification of concrete dams using an extended finite element–wavelet transform coupled procedure

2017 ◽  
Vol 24 (18) ◽  
pp. 4226-4246 ◽  
Author(s):  
Sajjad Pirboudaghi ◽  
Reza Tarinejad ◽  
Mohammad Taghi Alami
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wavelet Transform ◽  
System Identification ◽  
Damage Detection ◽  
Cohesive Crack ◽  
Modal Parameters ◽  
Concrete Dams ◽  
Extended Finite Element ◽  
Element Method

The aim of the present study is to propose a procedure for seismic cracking identification of concrete dams using a coupling of the extended finite element method (XFEM) based on cohesive crack segments (XFEM-COH) and continuous wavelet transform (CWT). First, the dam is numerically modeled using the traditional finite element method (FEM). Then, cracking capability is added to the dam structure by applying the XFEM-COH for concrete material. The results of both the methods under the seismic excitation have been compared and identified to damage detection purposes. In spite of predefined damage in some of the structural health monitoring (SHM) techniques, there is an advantage in the XFEM model where the whole dam structure is potentially under damage risk without initial crack, and may not crack at all. Finally, in order to evaluate any change in the system, that is, specification of any probable crack effects and nonlinear behavior, the structural modal parameters and their variation have been investigated using system identification based on the CWT. The results show that the extended finite element–wavelet transform procedure has high ability for the online SHM of concrete dams that by analysis of its results, the history of physical changes, cracking initiation time, and exact damage localization have been performed from comparing the intact (FEM) and damaged (XFEM) modal parameters of the structural response. In addition, any small change in the system is observable while the final crack profile and performance simulation of the dam body under strong seismic excitations have obtained.

Optimization Dressing Method of Amplitude Transformer Based on Finite Element

2013 ◽  
Vol 278-280 ◽  
pp. 315-318
Author(s):  
Ming Li Zhao ◽  
Bo Zhao ◽  
Yu Qing Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Resonant Frequency ◽  
Structural Parameters ◽  
Low Cost ◽  
Dressing Method ◽  
Finite Element Software ◽  
System Vibration ◽  
Vibration Performance ◽  
Element Method

The node position of amplitude transformer was determined by the finite element method, and the flange was designed at the nod position for conveniently installation. By the finite element software, the amplitude transformer with flange was optimized and dressed, and its structural parameters were determined. During the actual manufacturing process, it was used impedance analyzer to test its vibration performance, the testing results show that this system vibration performance is good, its resonant frequency is 34.771kHz, anti-resonant frequency is 35.008kHz. The above-mentioned results are very much coincided with the system natural frequency of 34.893kHz which is drew by finite element method. Compared to the traditional dressing this method has many advantages such as convenience, green, environmental protection, low cost and others.

Design and Finite Element Analysis of Corrugated Plate Boarding Bridge

2010 ◽  
Vol 97-101 ◽  
pp. 3727-3730
Author(s):  
Wen Hui Wei ◽  
Yan Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Analysis Software ◽  
Element Analysis ◽  
Design Requirements ◽  
Strength And Stiffness ◽  
Stress And Deformation ◽  
Element Method

With ANSYS finite element analysis software, finite element method is used to analyze the steel corrugated plate boarding bridge. Stress and deformation of the structure are obtained, and strength and stiffness are checked. Improvements are made on this basis to meet the design requirements.

ANSYS Application in Modal Analysis of Bus Body Frame

2012 ◽  
Vol 605-607 ◽  
pp. 656-659
Author(s):  
Li Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Performance ◽  
Modal Parameters ◽  
Body Frame ◽  
Critical Problems ◽  
Bus Body ◽  
Element Method

Some critical problems of bus body frame during the modal analysis are presented by the principle of Finite Element Method. Then bus body frame is analyzed. After the modal parameters of the frame are obtained, dynamic performance of body frame is discussed to provide reference for the betterment of body frame dynamic performance design.

Research on PET Beer Bottle Structural Parameters and it’s Strength

2013 ◽  
Vol 641-642 ◽  
pp. 488-491
Author(s):  
Wei Yuan ◽  
Li Hua Xie ◽  
Gai Mei Zhang ◽  
Da Zhi Liao ◽  
Jian Dong Lu
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Internal Pressure ◽  
Structural Parameters ◽  
Analysis Software ◽  
Element Analysis ◽  
Main Factors ◽  
Different Thickness

According to the formula of the resistance to internal pressure, the main factors of the strength of the beer bottles are analyzed. Using ANSYS finite element analysis software, PET beer bottles damaged boundary conditions are determined. PET beer bottle model is established, and have the stress analysis. The internal pressure and the bottle top pressure are applied on PET beer bottles. PET beer bottles strain is analyzed in two loads with different thickness and different bottle diameter. Thickness and bottle diameter influence of the mechanical properties of PET beer bottles are obtained. It provides a method and basis of the structure to optimize the design of PET beer bottles.

A Design Methodology for Tracked Vehicles Using Experimentally Identified Modal Parameters and the Finite Element Method

1994 ◽  
Author(s):  
M. K. Sarwar ◽  
A. A. Shabana ◽  
Toshikazu Nakanishi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Design Methodology ◽  
Element Model ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Tracked Vehicle ◽  
Made In ◽  
Element Method

Abstract The objective of this study is to develop a design procedure that integrates multibody techniques, the finite element method, and experimental modal analysis techniques. Multibody techniques and the finite element method are first used to develop and numerically test the performance of the proposed design. Based on this computer analysis, a prototype model can be built. The vibration modal parameters of this model can be determined experimentally and used with general purpose multibody computer programs to evaluate the performance of the design. The obtained numerical results can be compared with the results obtained previously using multibody techniques and the finite element method. Adjustments can then be made in the finite element description in order to obtain a more realistic model that compares well with the experimental data. Using the more realistic finite element model, design modifications can be made in order to improve the performance of the design model. The use of the design methodology proposed in this paper is demonstrated using a flexible tracked vehicle model that consists of fifty four interconnected bodies. In this model, the nonlinear contact forces that describe the interaction between the track links and the vehicle components and the ground are developed. The nonlinear dynamic equations of the vehicle are developed in terms of a coupled set of reference and chassis elastic modal coordinates. The flexibility of the chassis of the tracked vehicle is described using the finite element method and experimentally identified modal parameters. The results obtained using the finite element model are compared with the results obtained using experimentally identified modal parameters.

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