Time Domain Identification of Distributed Dynamic Load of Rotating Timoshenko Beam Based on Orthogonal Polynomial

2010 ◽  
Vol 29-32 ◽  
pp. 448-453
Author(s):  
Deng Jun ◽  
Fang Zhang ◽  
Guo Ping Chen
Keyword(s):  
Timoshenko Beam ◽  
Time Domain ◽  
Dynamic Load ◽  
Element Model ◽  
Load Identification ◽  
Continuous Beam ◽  
Domain Identification ◽  
Rotating Timoshenko Beam ◽  
Identification Theory ◽  
The Finite Element Model

Based on the theory of two-dimensional (2-D) orthogonal polynomials, the function of dynamic load is fit by using the primary functions sequence. The identification of the distributed dynamic load can be transformed into the solution of the fitting coefficients. For the finite element model of the rotating Timoshenko beam, the unknown distributed force is identified by the load identification theory of the continuous beam in time domain. Numerical simulation shows that the method is precise as long as enough data of feedback points are collected; and it is simple and effective for engineering applications.

Dynamic Load Identification Theoretical Summary and the Application on Mining Machinery

2013 ◽  
Vol 330 ◽  
pp. 811-814
Author(s):  
Peng Wang ◽  
Guo Lai Yang ◽  
Hui Xiao
Keyword(s):  
Dynamic Load ◽  
Frequency Domain Method ◽  
Load Identification ◽  
Engineering Structures ◽  
Structural Dynamic ◽  
New Methods ◽  
Identification Method ◽  
Domain Method ◽  
Mining Machinery ◽  
Identification Theory

This paper is devoted to describe a new dynamic load identification method about mining machinery structural; Frist, reviews the background of structural dynamic load identification theory; Then, introduce some familiar dynamic load identification methods, including frequency domain method, time domain method and some other new methods; Describe the steps about dynamic load identification method used in mining machinery engineering structures; Last, practice shows that the method is profitable.

Research on the Earthquake Dynamic Responses of Tunnel under Changing Tunnel Lining Rigidity

2011 ◽  
Vol 250-253 ◽  
pp. 1978-1982
Author(s):  
Xiao Ping Cao
Keyword(s):  
Finite Element ◽  
Dynamic Load ◽  
Element Model ◽  
Tunnel Lining ◽  
Dynamic Responses ◽  
Seismic Responses ◽  
Set Up ◽  
Deeply Buried Tunnel ◽  
Element Theory ◽  
The Finite Element Model

With the increasing of the quantity of the tunnel, more and more attentions have been paid to the tunnel destruction induced by earthquake. Based on the software of finite element, the finite element model for deeply buried tunnel have been set up; and the responses about different rigidity of tunnel lining under seismic dynamic load has been analyzed by using elastic finite element theory. The conclusions have been drawn that the change of seismic responses by increasing rigidity of tunnel lining is unobvious, and the method using increasing rigidity of tunnel lining to reduce the seismic responses of tunnel is uneconomical.

Time-domain Galerkin method for dynamic load identification

2015 ◽  
Vol 105 (8) ◽  
pp. 620-640 ◽  
Author(s):  
Jie Liu ◽  
Xianghua Meng ◽  
Chao Jiang ◽  
Xu Han ◽  
Dequan Zhang
Keyword(s):  
Galerkin Method ◽  
Time Domain ◽  
Dynamic Load ◽  
Load Identification

Study of Side Thrust of Diesel Piston Based on Time-Domain Finite Element Method

2012 ◽  
Vol 229-231 ◽  
pp. 461-464
Author(s):  
Da Yuan Zheng ◽  
Yi Peng Cao ◽  
Wen Ping Zhang
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Cylinder Liner ◽  
Element Model ◽  
Cylinder Pressure ◽  
Observation Window ◽  
Surface Vibration ◽  
Engine Vibration ◽  
Load Characteristics ◽  
The Finite Element Model

Grasping the transmission of side thrust of piston is one of the effective methods to control engine vibration and noise. The paper uses time-domain FEM to study engine vibration. Firstly the finite element model is established after simplifications and modal analysis is conducted. Then the side thrust of piston is calculated and applied to cylinder liner using equivalent nodal load. The surface vibration is gained, from which it can be concluded that the displacements of upper block and top cylinder head reflect changes in cylinder pressure, while the vibration of observation window is complex. Finally, the vibration in a variety of engine working conditions is analyzed. Under load characteristics, the amplitude of engine surface vibration changes with loading; under propulsion characteristics, the surface vibration is essentially the same.

Redrawing Operation a Star Shape from Cylindrical Shape Using Experimental and FE Analysis

2020 ◽  
Vol 38 (1A) ◽  
pp. 25-32
Author(s):  
Waleed Kh. Jawad ◽  
Ali T. Ikal
Keyword(s):  
Finite Element ◽  
Effective Strain ◽  
Element Model ◽  
Cylindrical Shape ◽  
Element Analysis ◽  
Punch Force ◽  
Maximum Value ◽  
Element Simulation ◽  
Blank Sheet ◽  
The Finite Element Model

The aim of this paper is to design and fabricate a star die and a cylindrical die to produce a star shape by redrawing the cylindrical shape and comparing it to the conventional method of producing a star cup drawn from the circular blank sheet using experimental (EXP) and finite element simulation (FES). The redrawing and drawing process was done to produce a star cup with the dimension of (41.5 × 34.69mm), and (30 mm). The finite element model is performed via mechanical APDL ANSYS18.0 to modulate the redrawing and drawing operation. The results of finite element analysis were compared with the experimental results and it is found that the maximum punch force (39.12KN) recorded with the production of a star shape drawn from the circular blank sheet when comparing the punch force (32.33 KN) recorded when redrawing the cylindrical shape into a star shape. This is due to the exposure of the cup produced drawn from the blank to the highest tensile stress. The highest value of the effective stress (709MPa) and effective strain (0.751) recorded with the star shape drawn from a circular blank sheet. The maximum value of lamination (8.707%) is recorded at the cup curling (the concave area) with the first method compared to the maximum value of lamination (5.822%) recorded at the cup curling (the concave area) with the second method because of this exposure to the highest concentration of stresses. The best distribution of thickness, strains, and stresses when producing a star shape by

Durability Analysis of the Reduction Gear for High Speed Train Considering Driving Histories

2012 ◽  
Vol 586 ◽  
pp. 269-273
Author(s):  
Chul Su Kim ◽  
Gil Hyun Kang
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Element Model ◽  
Rolling Stock ◽  
Reduction Gear ◽  
High Speed Train ◽  
Analysis Software ◽  
Tractive Effort ◽  
Durability Analysis ◽  
The Finite Element Model

To assure the safety of the power bogies for train, it is important to perform the durability analysis of reduction gear considering a variation of velocity and traction motor capability. In this study, two types of applied load histories were constructed from driving histories considering the tractive effort and the train running curves by using dynamic analysis software (MSC.ADAMS). Moreover, this study was performed by evaluating fatigue damage of the reduction gears for rolling stock using durability analysis software (MSC.FATIGUE). The finite element model for evaluating the carburizing effect on the gear surface was used for predicting the fatigue life of the gears. The results showed that the fatigue life of the reduction gear would decrease with an increasing numbers of stops at station.

Analysis of Hydroelectric Unit’s Upper Bracket Based on Test and FEM

2014 ◽  
Vol 721 ◽  
pp. 131-134
Author(s):  
Mi Mi Xia ◽  
Yong Gang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Element Analysis ◽  
Hydroelectric Unit ◽  
The Finite Element Analysis ◽  
Strain Rosette ◽  
The Finite Element Model

To research the load upper bracket of Francis hydroelectric unit, then established the finite-element model, and analyzed the structure stress of 7 operating condition points with the ANSYS software. By the strain rosette test, acquired the data of stress-strain in the area of stress concentration of the upper bracket. The inaccuracy was considered below 5% by analyzing the contradistinction between the finite-element analysis and the test, and match the engineering precision and the test was reliable. The finite-element method could be used to judge the stress of the upper bracket, and it could provide reference for the Structural optimization and improvement too.

Plumpness Analysis of Indicator Diagram for Vehicle Damper

2013 ◽  
Vol 415 ◽  
pp. 582-585
Author(s):  
Xing Xu ◽  
Zhen Cui ◽  
Jin Chao Zhang
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Dynamic Load ◽  
Performance Indicators ◽  
Load Distribution ◽  
The Body ◽  
Quantitative Index ◽  
Indicator Diagram ◽  
Vehicle Demand ◽  
Mathematical Relationships

According to the indicator diagram of damper, the indicator diagram plumpness was proposed as a quantitative index, and its mathematical relationships with the sprung mass acceleration, suspension dynamic travel and tire dynamic load were built. Moreover, the influence of the total area on suspension characteristics was analyzed in time domain and frequency domain. The results show that, the increase of the indicator diagram plumpness can effectively restrain the variation of suspension dynamic travel and tire dynamic load, meanwhile, the body acceleration will be enlarged. Excessive indicator diagram plumpness also affects the dynamic tire load distribution in frequency domain, and it will decrease the driving security. Therefore, it should be reasonably selected from the performance indicators, which is based on the requirement of vehicle demand in the design process.

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