Ride Dynamics of a Tracked Vehicle with a Finite Element Vehicle Model

2016 ◽  
Vol 66 (1) ◽  
pp. 19 ◽  
Author(s):  
S. Jothi ◽  
V. Balamurugan ◽  
K. Malar Mohan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vehicle Dynamics ◽  
Vertical Displacement ◽  
Experimental Result ◽  
Vehicle Model ◽  
Tracked Vehicle ◽  
The Road ◽  
Vehicle Test ◽  
Element Method

<p>Research on tracked vehicle dynamics is by and large limited to multi-rigid body simulation. For realistic prediction of vehicle dynamics, it is better to model the vehicle as multi-flexible body. In this paper, tracked vehicle is modelled as a mass-spring system with sprung and unsprung masses of the physical tracked vehicle by Finite element method. Using the equivalent vehicle model, dynamic studies are carried out by imparting vertical displacement inputs to the road wheels. Ride characteristics of the vehicle are captured by modelling the road wheel arms as flexible elements using Finite element method. In this work, a typical tracked vehicle test terrain viz., Trapezoidal blocks terrain (APG terrain) is considered. Through the simulations, the effect of the road wheel arm flexibility is monitored. Result of the analysis of equivalent vehicle model with flexible road wheel arms, is compared with the equivalent vehicle model with rigid road wheel arms and also with the experimental results of physical tracked vehicle. Though there is no major difference in the vertical bounce response between the flexible model and the rigid model, but there is a visible difference in the roll condition. Result of the flexible vehicle model is also reasonably matches with the experimental result.</p><p><strong>Defence Science Journal, Vol. 66, No. 1, January 2016, pp. 19-25, DOI: http://dx.doi.org/10.14429/dsj.66.9201</strong></p>

Three Dimensional Dynamic Analyses on Stroller Wheel with Shock Absorber

2013 ◽  
Vol 387 ◽  
pp. 159-163
Author(s):  
Yi Chern Hsieh ◽  
Minh Hai Doan ◽  
Chen Tai Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Adaptive Finite Element Method ◽  
Adaptive Finite Element ◽  
The Road ◽  
Dimensional Finite Element ◽  
On The Road ◽  
Three Dimensional Finite Element ◽  
Element Method

We present the analyses of dynamics behaviors on a stroller wheel by three dimensional finite element method. The vibration of the wheel system causes by two different type barriers on the road as an experiment design to mimic the real road conditions. In addition to experiment analysis, we use two different packages to numerically simulate the wheel system dynamics activities. Some of the simulation results have good agreement with the experimental data in this research. Other interesting data will be measured and analyzed by us for future study and we will investigate them by using adaptive finite element method for increasing the precision of the computation results.

scholarly journals Cutting Force Predication Based on Integration of Symmetric Fuzzy Number and Finite Element Method

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Zhanli Wang ◽  
Yanjuan Hu ◽  
Yao Wang ◽  
Chao Dong ◽  
Zaixiang Pang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Force ◽  
Fuzzy Number ◽  
Experimental Result ◽  
The Finite Element Method ◽  
Mechanical Coupling ◽  
Fuzzy Function ◽  
Nonuniform Stress Field ◽  
Element Method

In the process of turning, pointing at the uncertain phenomenon of cutting which is caused by the disturbance of random factors, for determining the uncertain scope of cutting force, the integrated symmetric fuzzy number and the finite element method (FEM) are used in the prediction of cutting force. The method used symmetric fuzzy number to establish fuzzy function between cutting force and three factors and obtained the uncertain interval of cutting force by linear programming. At the same time, the change curve of cutting force with time was directly simulated by using thermal-mechanical coupling FEM; also the nonuniform stress field and temperature distribution of workpiece, tool, and chip under the action of thermal-mechanical coupling were simulated. The experimental result shows that the method is effective for the uncertain prediction of cutting force.

Calculation of Heat Distribution in High Speed Cutting Based on Finite Element Method

2009 ◽  
Vol 626-627 ◽  
pp. 249-254
Author(s):  
Wang Yu Liu ◽  
X.K. Liu ◽  
Jing Li ◽  
Yong Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Experimental Result ◽  
Analytic Method ◽  
Heat Distribution ◽  
Analytic Model ◽  
The Finite Element Method ◽  
High Speed Cutting ◽  
Element Method

Combined the analytic method with the finite element method, the data necessary for calculating the heat distribution ratio for high speed cutting was mined first, and the experimental result was used to validate the authenticity of finite element modeling. Then, the ratio of heat distribution for high speed cutting based on the analytic model was obtained by customizing the special subroutine developed by the authors, which provides a new method for calculating the heat distribution.

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.

Renewed Inflation of Krafla Caldera, Iceland, since 2018: Sensitivity of Ground Deformation to lateral variation in Earth structure and architecture of the magmatic system explored with the Finite Element Method

2020 ◽  
Author(s):  
Chiara Lanzi ◽  
Vincent Drouin ◽  
Siqi Li ◽  
Freysteinn Sigmundsson ◽  
Halldor Geirsson ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Properties ◽  
Ground Deformation ◽  
Vertical Displacement ◽  
Magma Source ◽  
The Finite Element Method ◽  
Spherical Source ◽  
Horizontal Displacements ◽  
Element Method

&lt;p&gt;The Krafla volcanic area in Northern Volcanic Zone of Iceland was characterized by deflation starting in 1989, suggesting a general pressure decrease and/or volume contraction at depth, which then exponentially decayed until having no significant deformation since around 2000.&amp;#160; In summer 2018, the volcano behaviour changed to inflation as observed both by Global Navigation Satellite System (GNSS) geodesy &amp;#160;and Sentinel-1 satellite radar interferometry (InSAR). Inflation since 2018 occurs at a rate of 10-14 mm/yr, centered in the middle of the caldera. No significant change in seismicity has occurred in the area in 2018, but seismic moment release ocurrs at a higher rate since middle 2019. Gravity stations in the area were remeasured in November 2019 for allowing comparison with earlier observations, and for providing reference for later studies. Initial modelling of the geodetic data is carried out assuming that the deformation is caused by a spherical source of pressure in an uniform elastic half-space. The result suggests that the deformation can be broadly explained by a single source of magma inflow at depth around 3.9-7.5 km, with the best-fit value around 4-4.5 km. We also apply the Finite Element Method (FEM) to additionally consider modification of the deformation field caused by Earth&amp;#8217;s elastic heterogeneities and the uncertain geometry and&amp;#160; depth of the magma source. A set of FEM models are built with the COMSOL Multiphysics software in a 50x50 km domain where we test three different geometries of the source: a spherical source (radius 1000 km), a prolate ellipsoid,&amp;#160; and an oblate ellipsoid (sill-like) source, at 2.5, 4.0 and 5.5 km of depth. We also build a model to test how the vertical and horizontal displacements may be influenced by different elastic properties (e.g. Young&amp;#8217;s modulus; about an order of magnitude different within a caldera boundary) for these sources. The results show that lateral variations in material properites can have a significant influence on ground deformation. Low-value Young&amp;#8217;s inside caldera boundaries compared to higher values outside caldera boundaries will in particular influence the vertical displacement: the vertical displacement is about half of of what it is the original modelling. &amp;#160;The ratio of vertical to horizontal displacements will thus also be modified. This can in turn influence the inferred magma source geometry as it depends on the displacement ratios. The outcome of our study will provide better constrain for the elastic properties in Krafla area, and help understand the magma intrusion rate in the area.&lt;/p&gt;

Development of Stereolithography Simulation Process Based on the Dynamic Finite Element Method

2007 ◽  
Vol 340-341 ◽  
pp. 329-334
Author(s):  
You Min Huang ◽  
Cho Pei Jiang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Stiffness ◽  
Scanning Speed ◽  
Weight Coefficient ◽  
Experimental Result ◽  
Simulation Code ◽  
Dynamic Finite Element ◽  
Scanning Path ◽  
Element Method

In this study, a general simulation code is developed to analyze the shrinkage effect of polymerization and optimize the fabrication parameters including the scanning path, exposure time and scanning speed for the stereolithography system. The code is based on the dynamic finite element method. Liquid element is preconstructed without curing properties till the absorption energy exceeds the critical value of dynamic stiffness matrix assembling. A unit element block is utilized with a weight coefficient for expressing a laser Gaussian energy distribution during the discretizing of the scanning path into increments. A fan blade is proposed to validate the agreement between the simulation and experimental results. The prototype is a fabrication and the surface of blade was measured by the digitizing system ATOS (Advanced TOpometric Sensor) for comparing the deformation with analysis prediction. Consequently, the simulated result closely conforms to the experimental result.

scholarly journals Analysis of Rake Angle Effect to Stress Distribution on Excavator Bucket Teeth Using Finite Element Method

2018 ◽  
Vol 3 (12) ◽  
pp. 1222
Author(s):  
Sumar Hadi Suryo ◽  
A. P. Bayuseno ◽  
J. Jamari ◽  
A. Imam Wahyudi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Rake Angle ◽  
The Road ◽  
Heavy Equipment ◽  
Safe Limits ◽  
Angle Effect ◽  
Materials Used ◽  
Element Method

Excavator is mostly used for mining and construction. This heavy equipment, widely known as a backhoe, is a digging machine commonly used for dredging the mining materials, digging and leveling the soil, dredging the river, removing the road and demolition. Excavator has bucket teeth, component that frequently undergoes a change. The replacement of bucket teeth is performed due to its low usage time and many failure experiences such as wear, bend, crack and facture during the use. To prevent the occurrence of the failures, a structural analysis on bucket teeth is necessarily conducted. The analysis was conducted to find the stress distribution on bucket teeth from the rake angle effect during the excavation. The analysis was performed using finite element method by static loading and two-dimensional modeling to determine digging and resistive force in bucket teeth. Based on the analysis, it was obtained the stress distribution and maximum value of von misses occurring in the bucket teeth from the rake angle effect. The maximum stress, obtained from the analysis results, was then compared to the allowable stress of the bucket teeth material. The results showed that the materials used were in safe limits and had small potential for experiencing failure as well.

scholarly journals DESIGN IMPROVEMENT AND VIBRATION ANALYSIS OF GANTRY SYSTEM USING FINITE ELEMENT METHOD (FEM)

2019 ◽  
Vol 1 (1) ◽  
pp. 17-21
Author(s):  
Faris A Putra ◽  
Dena Hendriana ◽  
Hanny J Berchmans
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequency ◽  
Industrial Robot ◽  
Experimental Result ◽  
System Failure ◽  
Design Improvement ◽  
3D Cad ◽  
Mode 3 ◽  
Element Method

A Gantry or linear robot is an industrial robot that move in straight line in three axes and at right angles to each other. Its structure must be able to hold the vibration depends on its function because vibration behavior and natural frequency plays a key role to every system in dynamic analysis, which can cause the system failure. Finite Element Method (FEM) and gyroscope can be used to analyze the vibration and natural frequency, it is very important to improve the design to avoid system failure. Gantry system in PT. Akebono Brake Astra Indonesia has unrigid structure and contain too much vibration. The system was designed in 3D CAD by Solidworks software and analyzed using frequency analysis, then comparing the result with experimental result using accelerometer gyroscope to know the validity of the model. Design improvement is conducted to improve the vibration system by increasing their natural frequency. From the improvement result, the natural frequency increased in every mode shape, mode 1: from 16,559 Hz become 23,56 Hz; mode 2: from 17,903 Hz become 30,967 Hz; mode 3: from 55,856 Hz become 60,715 Hz; mode 4: from 73,804 Hz become 82,266 Hz; mode 5: from 88,367 Hz become 97,477 Hz.

scholarly journals PENGARUH PERKUATAN TIANG TERHADAP STABILITAS TIMBUNAN DIATAS TANAH LUNAK MENGGUNAKAN METODE ELEMEN HINGGA

2020 ◽  
Vol 3 (2) ◽  
pp. 54
Author(s):  
Bambang Setiawan ◽  
Raden Harya Dananjaya H.I. ◽  
Muhammad Fathurrahman
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Safety Factor ◽  
Effective Stress ◽  
Soft Soil ◽  
Vertical Displacement ◽  
The Finite Element Method ◽  
The Road ◽  
Road Pavement

<p><em>Pile strength is widely used as a solution to the problem of road pavement on soft soil, because it can reduce vertical displacement due to the load on it and increase the safety factor value. This research analyses the vertical displacement, safety factor, effective stress and bearing capacity of the embankment on soft soil using the finite element method so the results can approach the original conditions in the field.</em> <em>The pile variations used are pile size variations 20x20 cm<sup>2</sup>; 25x25 cm<sup>2</sup>; and 30x30 cm<sup>2</sup> with a square shape, variations in the distance between the piles 1,60 m; 1,80 m; 2,00 m; and 2,20 m, the depth variations 15,00 m; and 20,00 m. Loading uses truck loads based on RSNI T-14-2004 and the road classification is artery IA. The results of the analysis show that pile strength with a size 20x20 cm<sup>2</sup>, the distance between pile is 1,60 m and the depth of the piles 20 m can reduce the vertical displacement by 71,31% and increase the safety factor by 123,25%.</em></p>

scholarly journals ANALISIS LENDUTAN MODEL SISTEM CAKAR AYAM MODIFIKASI DENGAN PEMBEBANAN TUNGGAL (BEBAN TITIK)

2019 ◽  
Vol 2 (2) ◽  
pp. 53
Author(s):  
Lutfi Ahmad Yudandi ◽  
Bambang Setiawan ◽  
Noegroho Djarwanti
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Soft Soil ◽  
The Road ◽  
Variation Distance ◽  
The Difference ◽  
Element Method

<em>Soft soil has low bearing capacity and high compressibility that can cause instability and long-term degradation that can make around some road settlement or wavy. A solution to prevent this soft soil problem was built Modified Chicken Foot, The function of Chicken Foot Foundation is to increase its bearing capacity. This research is using single load<strong> </strong>with variation distance of triangle foot foundation pattern whereas analysis of deflection using finite element method based. The research shows displacement result is depend on distance between load position and foot foundation, the closer distance between foot foundation the less it would result. The displacement result that happened at roadside is larger than at middle of the road, the difference between them is -6,8% up to 67% and The displacement result that happened in plate without pipe is larger than a plate with pipe, the difference between them is 12,31% up to 59,41%.  </em>

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