Finite Element Analysis for Interior Booming Noise Reduction in a Tractor Cabin

2005 ◽  
Author(s):  
Ji Cao ◽  
Liming Dai
Keyword(s):  
Finite Element ◽  
Low Frequency ◽  
Element Model ◽  
Structural Vibration ◽  
Steel Beams ◽  
Element Analysis ◽  
Resonant Frequencies ◽  
Model Counting ◽  
Element Approach ◽  
Aluminum Panels

This paper presents a finite element approach to analyze the “boom” noise for a compact tractor cabin. The tractor cabin is initially designed to have a structure made up of steel beams and aluminum panels, as well as PMAA panels in windshield, backlight and windows. Cavity acoustic modes of the cab are evaluated and the acoustic resonant frequencies are identified. The study on the structural-borne noise from the cabin structural vibration generated by the engine of the vehicle is performed. A coupled-field finite element model, counting the interactions between the air fluid inside the cabin compartment and the cabin exterior structure, is presented for investigating the structural-borne noise in a low frequency range of 20 Hz to 80 Hz. This range has shown strong boom effects. The interior noise level at driver’s right ear position is investigated. The peak noise levels at the position are determined. The effects of additional stiffeners and damping layers on the boom noise are also investigated.

scholarly journals Numerical analysis of castellated beams with oval openings

2018 ◽  
Vol 195 ◽  
pp. 02008
Author(s):  
Yanuar Setiawan ◽  
Ay Lie Han ◽  
Buntara Sthenly Gan ◽  
Junaedi Utomo
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Main Idea ◽  
Element Model ◽  
Steel Beams ◽  
Good Representation ◽  
Actual Behavior ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Web

The use of castellated beams has become more popular in the last two decades. The main idea for the use of these types of steel beams is to reduce their self-weight by providing openings in the web of wide flange (WF) or I sections. Numerous research on castellated beams has been conducted, the majority of the studies aimed to optimize the opening size and the shape configuration of the openings. A numerical analysis of castellated beams with oval openings was performed in this study. The sections under investigation had variations in the height-to-length ratios of the beam. The Do to D and b to Do ratios were kept at a constant. The D value was defined as the height of the beam, while Do is the height of the opening, and b is the width of the opening. The numerical analysis was performed by the finite element analysis using the STRAND7 software. The numerical model was further validated to the experimental data. The results showed that the developed finite element model resulted in a very good representation to the actual behavior of the sections.

Finite Element Analysis of Mechanical Characteristics on the Composite Rubber Suspension of Heavy Vehicle

2011 ◽  
Vol 121-126 ◽  
pp. 1702-1706
Author(s):  
Hui Pang ◽  
Hong Yan Li ◽  
Zong De Fang ◽  
Xiao Yuan Zhu
Keyword(s):  
Finite Element ◽  
Lightweight Design ◽  
Element Model ◽  
Heavy Vehicle ◽  
Virtual Design ◽  
Element Analysis ◽  
Static Mechanical ◽  
Element Approach ◽  
Suspension Stiffness ◽  
Static Mechanical Properties

Taking the composite rubber suspension of a 6×4 heavy vehicle as research object, an accurate finite element model for the composite suspension at loading states is firstly built with consideration of nonlinear contact between spring leaves, and then a new finite element approach for calculating and analyzing static mechanical properties of the composite rubber suspension. Finally, the stress distribution and deformation is analyzed under different loads by using Hypermesh software and the results can be applied to its strength design. And moreover, some primary principles of the composite rubber suspension stiffness and displacement changing with different loads are obtained, which provides reference basis for virtual design and lightweight design of the vehicle composite rubber suspension.

Vibration Prediction of Box Girder Bridges Used in High-Speed Railways Based on Model Test

2020 ◽  
Vol 20 (05) ◽  
pp. 2050064
Author(s):  
Kun Luo ◽  
Xiaoyan Lei ◽  
Xinya Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Model Test ◽  
High Speed ◽  
Element Model ◽  
Structural Vibration ◽  
Scaled Model ◽  
Element Analysis ◽  
Box Girder ◽  
Test Result

In order to predict more accurately the structural vibration and noise of elevated tracks induced by moving trains, a new prediction method based on the scaled model test is proposed in this paper. A 32-m simply supported box girder bridge used in the Beijing–Shanghai high-speed railway is selected as the prototype for designing and constructing a scaled model test with 10:1 geometric similarity ratio. Both experimental tests and finite element analyses were carried out to verify the similarity relationship between the model and prototype. The test result shows that the scaled model can predict the structural vibration and noise of the prototype, as long as the similarity constants between the prototype and scaled model are correctively determined. Furthermore, a standard finite element analysis model for the scaled model is built. Based on the sensitivity analysis, the model parameters for finite element analysis are updated by minimizing the errors between the measured and calculated modes. The computational results show that the updated model based on the local parameters partitioning works best, and the precision of the modal frequency calculated is noticeably improved after updating, with the average relative error reduced from 5.46% to 3.09%, and the difference of the peak values reduced from [Formula: see text][Formula: see text]m/s2 to [Formula: see text][Formula: see text]m/s2. The calculated dynamic response of the finite element model after updating is basically in line with experimental results, indicating that the updated model can better reflect the dynamic properties of the scaled box girder model. The updated finite element model is useful both for verification with the model test result and for reliable prediction of the dynamic characteristics of the prototype.

Numerical Simulation of SAW Heat Source in the External Longitudinal Magnetic Field in 16Mn Steel

2013 ◽  
Vol 762 ◽  
pp. 584-589 ◽  
Author(s):  
Yun Long Chang ◽  
Lin Lu ◽  
Xiao Long Liu ◽  
Bo Young Lee
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Finite Element ◽  
Heat Source ◽  
Longitudinal Magnetic Field ◽  
Assembly Language ◽  
Low Frequency ◽  
Element Model ◽  
Element Analysis ◽  
Weld Bead Formation

The finite element analysis on temperature field and stress field during submerged-arc welding (SAW) was carried out by means of assembly language of FORTRAN on the base of ABAQUS. A finite element model was established to study the effects on weld bead formation by using longitudinal magnetic field of low-frequency and different process parameters loaded with moving heat source. A practical SAW experiment was conducted to verify the results of the numerical simulation. It was shown that a molten pool with a wider weld face and a lower penetration could be obtained by the control of longitudinal magnetic field of low-frequency. In addition, the fusion line after this treatment was smoother than with conventional SAW. The results of practical SAW experiment were consistent with those of the numerical simulation. It was confirmed that the longitudinal magnetic field of low-frequency could contribute in diminishing the dilution rate and improving the performance of surfacing layers.

Performance Evaluation of a Transmission Tower Subjected to Base Settlement

2015 ◽  
Vol 744-746 ◽  
pp. 361-365
Author(s):  
Yi Jiang Wu ◽  
Qing Dong Meng ◽  
Gan Jun Wang
Keyword(s):  
Finite Element ◽  
Structural Damage ◽  
Element Model ◽  
Structural Safety ◽  
Transmission Tower ◽  
Element Analysis ◽  
Line System ◽  
Transmission Angle ◽  
Element Approach ◽  
Internal Forces

The simulation of support settlement of a transmission angle-tower is actively carried out in this study based on the actual structural damage events. The mechanical model of the transmission angle-tower is developed based on the spatial member finite element approach. The finite element model of the transmission tower-line system is constructed by taking a real 220KV transmission tower as an example. The support settlement of the tower is analyzed and the collected information are utilized in the structural finite element analysis. The made observations indicate that the support settlement may induce large structural internal forces, which may induce potential disk to the structural safety.

Refined Finite Element Analysis for the Low Frequency Characteristics of the Trachea-Bronchia

2003 ◽  
Author(s):  
A. M. Al-Jumaily ◽  
N. Mago
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Frequencies ◽  
Surrounding Medium ◽  
Low Frequency ◽  
Element Model ◽  
Frequency Characteristics ◽  
Element Analysis ◽  
Out Of Plane ◽  
Branching Angle

Incorporating the properties of the surrounding medium, the low frequency characteristics of the trachea-bronchia are determined using a relatively accurate Finite Element Model (FEM). Focus is made on the effect of the branching angle and the embedding surroundings on these characteristics. It is concluded that the natural frequencies are significantly influenced by the surrounding medium elastance and are insignificantly affected by the branching angle within realistic values (30, 45 60 degree in plane and 45 degree in plane plus 45 degree out of plane branching angles investigated).

Acoustic Modal Test and Finite Element Analysis on Vehicle Cavity

2012 ◽  
Vol 239-240 ◽  
pp. 32-36 ◽  
Author(s):  
Wei Ling Hou ◽  
Hong Zhou ◽  
Si Le Wang
Keyword(s):  
Finite Element ◽  
Commercial Vehicle ◽  
Low Frequency ◽  
Element Model ◽  
Acoustic Properties ◽  
Frequency Range ◽  
Element Analysis ◽  
Modal Test ◽  
Analysis System ◽  
The Finite Element Model

A cavity acoustic modal of a medium-sized commercial vehicle was tested and analyzed based on LMS Test.Lab modal analysis system. Acoustic modal characteristics, including modal frequencies and modal shapes of the cavity, were obtained. By comparing the results of acoustic modal frequencies to the structure modal ones, the acoustic-structure coupling at critical frequencies could be avoided and the noise in low frequency range could be reduced. Meanwhile, the simulation of the acoustic modal is analyzed by establishing the finite element model of the cavity, which may be a reference to improve the interior acoustic properties of the cavity.

Prediction of Modal Damping of Jet Engine Stator Vanes Using Finite Element Techniques

1976 ◽  
Author(s):  
P. Trompette ◽  
M. Paulard ◽  
M. Lalanne ◽  
D. I. G. Jones ◽  
M. L. Parin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Low Cost ◽  
Element Analysis ◽  
Resonant Frequencies ◽  
Jet Engine ◽  
Modal Damping ◽  
Stator Vane ◽  
Element Approach ◽  
As Stress

A finite-element analysis utilizing isoparametric elements is used to predict the modal damping and resonant frequencies of a jet engine high pressure compressor stator vane with a damping treatment in the form of an enamel coating applied to the surface. The results of the finite-element analysis are shown to agree well with experimentally measured data. The ultimate advantage of this particular finite-element approach is that it can be applied at very low cost to predicting the effect of many types of damping treatment on modal damping and resonant frequencies of practically any structural component, as well as stress levels if the excitation forces are known.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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