Influence of bridge parameters on monorail vehicle–bridge system—A research with multi-rigid body and multi-flexible body coupling theory and Park method

2020 ◽  
pp. 146134842094235
Author(s):  
Yongzhi Jiang ◽  
Pingbo Wu ◽  
Jing Zeng ◽  
Xingwen Wu ◽  
Qinglie He ◽  
...  
Keyword(s):  
Element Model ◽  
Variable Step Size ◽  
Step Size ◽  
Simulation Accuracy ◽  
System A ◽  
Vehicle System ◽  
Coupling System ◽  
Stiffness And Damping ◽  
Web Plates ◽  
The Finite Element Model

The parameters of the monorail bridge, which have a significant effect on the vehicle, are analyzed in this paper. With Park method, a complicated solver of the second order with a variable step size, equations insolvable to traditional methods can be solved and a more complicated dynamic model could be built. Different from some traditional simulation of vehicle–bridge coupling system, the bridge is divided into the girder and piers. The finite element model of each part is created separately in Ansys and coupled with the vehicle system in UM, which helps the analysis of the interaction forces between flexible components and better simulation accuracy can be obtained. FIALA model is used to calculate the wheel force. These methods make the measurement more precise. The study shows that all the variables except for the stiffener thickness have little effect on the vibration of the vehicle due to the good vibration reduction performance of the vehicle system. The resonance of the girder could be avoided by changing the thickness of the stiffeners and web plates. In addition, high stiffness and damping of the connection point of the girder and pier are helpful in alleviating the vibration of the bridge.

Updating Rotor-Bearing Finite Element Models

1997 ◽  
Author(s):  
Cristinel Mares ◽  
Cecilia Surace
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Parameters Estimation ◽  
Flexible Rotor ◽  
Estimation Errors ◽  
Rotor Bearing ◽  
Bearing Stiffness ◽  
Measured Frequency Response ◽  
Stiffness And Damping ◽  
The Finite Element Model

Abstract In this paper, the possibility of updating the finite element model of a rotor-bearing system by estimating the bearing stiffness and damping coefficients from a few measured Frequency Response Functions using a Genetic Algorithm is investigated. The issues of identifiability and parameters estimation errors, computational costs and algorithm tuning are addressed. A simulated example of a flexible rotor supported by orthotropic bearings is used for illustrating the method.

Identification of Joint Parameters for a Taper Joint

1989 ◽  
Vol 111 (3) ◽  
pp. 282-287 ◽  
Author(s):  
T. R. Kim ◽  
S. M. Wu ◽  
K. F. Eman
Keyword(s):  
Finite Element ◽  
Experimental Verification ◽  
Joint Stiffness ◽  
Element Model ◽  
Damping Characteristics ◽  
Analysis Technique ◽  
Joint Parameters ◽  
Stiffness And Damping ◽  
Taper Joint ◽  
The Finite Element Model

A new methodology of combining the finite element model of a structure with the results of the experimental modal analysis technique was applied to a tool-holder system with a taper joint to identify its joint stiffness and damping characteristics. The underlying background is briefly introduced followed by an experimental verification of the proposed method.

Identification of Dynamic Rates of Elastomeric Vibration Isolators in Automotive Vehicles

2004 ◽  
Author(s):  
Donald J. Nefske ◽  
Shung H. (Sue) Sung ◽  
Douglas A. Feldmaier
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Stiffness ◽  
Element Model ◽  
Interior Noise ◽  
Rear Suspension ◽  
Model Comparisons ◽  
Vibration Isolators ◽  
Vehicle System ◽  
Stiffness And Damping

Dynamic stiffness and damping rates of elastomeric vibration isolators used in automotive vehicles are identified from static isolator tests and the use of an isolator finite element model. Comparisons are made of the predicted versus measured dynamic stiffness and damping rates from 0 to 300 Hz of a rear suspension isolator to validate the technique. The identified dynamic rates of the elastomeric isolators of a representative vehicle are then input to the vehicle system finite-element model to compare the predicted versus measured vehicle vibration and interior noise response for laboratory shaker excitation.

Modeling Method of Assembled Structure Coupling the Characteristics of the Joints

2012 ◽  
Vol 468-471 ◽  
pp. 2141-2148
Author(s):  
Tie Neng Guo ◽  
Xue Li Yu ◽  
Fu Ping Li ◽  
Li Gang Cai ◽  
Ya Hui Cui
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Experimental Investigations ◽  
Beam Elements ◽  
Joint Characteristics ◽  
Proposed Model ◽  
Mechanics Analysis ◽  
Stiffness And Damping ◽  
The Finite Element Model

Mechanical properties of the joints have impacted on the whole mechanical characteristics. Coupling the joint characteristics in the modeling of the machine tool is an important problem in machine mechanics analysis. In order to solve the joint modellings in the assembled structure, this paper presents a new method to creat beam elements between two symmetrical nodes on the contact surface of the joint. The stiffness and damping matrices of the elements are valuated according to the characteristics of the joint. To validate the accuracy of the proposed method, the modeling of an assembled structure with and without the joints is obtained and some corresponding experimental investigations are implemented. The error between the simulated and experimental results of the finite element model is less than 8.8%, while the error of the contact model often used in the existing literatures is one times bigger than the proposed model.

Dynamic Analysis and Experimental Study of MW Wind Turbine Gearbox

2011 ◽  
Vol 86 ◽  
pp. 739-742 ◽  
Author(s):  
Hai Jun Wang ◽  
Xue Song Du ◽  
Xiang Yang Xu
Keyword(s):  
Modal Analysis ◽  
Wind Power ◽  
Natural Frequencies ◽  
Element Model ◽  
Normal Operation ◽  
Wind Turbine Gearbox ◽  
Power Train ◽  
Coupling System ◽  
Wind Power System ◽  
The Finite Element Model

Gearbox is the core component of wind power train，the operating of which directly affects the normal operation of wind power system, therefore, it is of great significance to carry out the dynamic characteristics of wind power gear box. The finite element model of coupling system composed of gear-rotor-bearing-box is established. By using Lanczos method，natural frequencies and vibration models are obtained. According to the method of experimental modal analysis，the MW wind power gearbox is tested by using SIMO method, the result of which agrees with theoretical calculation. Both of them verify the reliability of finite modal analysis of MW wind power gearbox.

scholarly journals Numerical Simulation of The Response of An Underground Pipeline Connector With a Super-Large Section Under Complex Geological Conditions

2021 ◽  
Author(s):  
Long Ma ◽  
Ping Ai ◽  
ChuanSheng Xiong
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Simulation Method ◽  
Large Section ◽  
Simulation Accuracy ◽  
Numerical Simulation Method ◽  
Geological Conditions ◽  
The Finite Element Model

Abstract Aiming at the low simulation accuracy of the numerical simulation method of the joint response of the super-large section underground comprehensive pipeline gallery under the current complicated geological conditions, a numerical simulation method of the joint response of the super-large section underground comprehensive pipe gallery joint response under the complicated geological conditions based on the finite element model was proposed. According to the analysis process for the super-large section underground comprehensive pipe gallery, the viscous boundary of the comprehensive pipe gallery is determined. Additionally, by analyzing soil and structural parameters, the optimal combined dynamic boundary is used as the model boundary. The HSS model is used to describe the constitutive structure of the soil, and by improving the Goodman element to describe the contact surface of the model, the finite element model of the joint response of the comprehensive pipe gallery is constructed. Furthermore, based on the internal force balance and deformation coordination conditions, considering the influence of the deformation shape of the joint joints and the elongation of the prestressed tendons on the finite element model, the response model of the integrated pipe gallery joint is optimized. Experimental results show that the proposed method has higher numerical simulation accuracy.

A Direct Two Response Approach for Updating Analytical Dynamic Models of Structures With Emphasis on Uniqueness

1990 ◽  
Vol 112 (1) ◽  
pp. 107-111 ◽  
Author(s):  
S. R. Ibrahim ◽  
C. Stavrinidis ◽  
E. Fissette ◽  
O. Brunner
Keyword(s):  
Finite Element ◽  
Degrees Of Freedom ◽  
Dynamic Models ◽  
Normal Modes ◽  
Element Model ◽  
Finite Element Models ◽  
Complex Modes ◽  
Structural Responses ◽  
Stiffness And Damping ◽  
The Finite Element Model

An approach, based on utilizing only two sets of structural responses and the enforcement of the conditions for a unique solution, is presented for the updating of Finite Element Models. The responses required can be any two identified normal modes, any two identified complex modes, or two forced harmonic response vectors in the neighborhood of any two natural frequencies of the structure under test. The mass, stiffness, and damping matrices are interactively and simultaneously corrected in a direct noniterative procedure. A uniqueness factor is automatically computed in the procedure to indicate the correctability of the Finite Element Model under consideration. The number of measurement locations is assumed to be less than the number of degrees of freedom of the analytical model. Provisions for completing and smoothing the measured or identified responses are included to reduce the effects of measurement noise and identification error. Preliminary results on simple models are presented in support of the proposed technique.

Substructure Methods in Vibration

1995 ◽  
Vol 117 (B) ◽  
pp. 207-213 ◽  
Author(s):  
R. R. Craig
Keyword(s):  
Synthesis Method ◽  
Original System ◽  
Element Model ◽  
Literature Survey ◽  
Reduced Order Models ◽  
Structural System ◽  
Reduced Order ◽  
Dynamic Excitation ◽  
System A ◽  
The Finite Element Model

When the response of a structural system to dynamic excitation must be analyzed, a substructure coupling method (or component-mode synthesis method) is frequently employed to reduce the order of the finite element model of the structure. This paper reviews procedures used to formulate component modes for substructures and to assemble substructure models to form reduced-order models of the original system. A brief literature survey covering several applications of substructure coupling is also presented.

Substructure Methods in Vibration

1995 ◽  
Vol 117 (B) ◽  
pp. 207-213 ◽  
Author(s):  
R. R. Craig
Keyword(s):  
Synthesis Method ◽  
Original System ◽  
Element Model ◽  
Literature Survey ◽  
Reduced Order Models ◽  
Structural System ◽  
Reduced Order ◽  
Dynamic Excitation ◽  
System A ◽  
The Finite Element Model

When the response of a structural system to dynamic excitation must be analyzed, a substructure coupling method (or component-mode synthesis method) is frequently employed to reduce the order of the finite element model of the structure. This paper reviews procedures used to formulate component modes for substructures and to assemble substructure models to form reduced-order models of the original system. A brief literature survey covering several applications of substructure coupling is also presented.

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