scholarly journals Numerical analysis of wagon leaf spring using Ansys 14.5

2021 ◽  
Vol 27 (4) ◽  
pp. 119-123
Author(s):  
Mladen Krstić ◽  
Branislav Milenković ◽  
Đorđe Jovanović
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Static Analysis ◽  
Software Package ◽  
Suspension System ◽  
Leaf Spring ◽  
Cad Model ◽  
Commercial Vehicles ◽  
Ansys Software ◽  
Leaf Springs

Leaf springs are widely used for the suspension system in trains and commercial vehicles to absorb vibrations and shocks. This paper deals with the methodology of analysis of the leaf springs of the freight railway wagons by using software package Ansys 14.5. The methodology is applied in a concrete example of leaf spring for axle load of 225 kN. The procedure of forming the CAD model of the leaf spring using AutoCad and Autodesk Inventor is exposed, as well as the development of numerical model in Ansys software package. The results of the static analysis of given leaf spring are presented and commented.

Numerical Analysis and Optimization on Dynamic Performance of Large Turbo Generator Frame Foundation

2012 ◽  
Vol 166-169 ◽  
pp. 720-724
Author(s):  
Bai Sheng Wang ◽  
Dong Hui Cao ◽  
Ying Wu Yang ◽  
Chun Xiao Xu ◽  
Hua Jun Qian
Keyword(s):  
Numerical Analysis ◽  
Power Plant ◽  
Numerical Model ◽  
Working Conditions ◽  
Structural Design ◽  
Dynamic Performance ◽  
Linear Displacement ◽  
Ansys Software ◽  
Amplitude Control ◽  
Turbo Generator

A space numerical model about 1000MW turbo generator foundation of a power plant is established by ANSYS software, meanwhile analyzing the model’s vibration characteristics and response under the turbo generator working conditions. According to the existing norms, optimizing the foundation based on the linear displacement amplitude control, furthermore researching the corresponding dynamic on the optimized foundation for guidance to structural design.

scholarly journals The legal and technical possibilities of using of scaffoldings as the ramp for disabled persons

2015 ◽  
Vol 14 (1) ◽  
pp. 005-014
Author(s):  
Ewa Błazik-Borowa ◽  
Michał Pieńko ◽  
Aleksander Robak
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Stress Analysis ◽  
Static Analysis ◽  
Disabled Persons ◽  
Technical Documentation ◽  
System Components ◽  
The Disabled ◽  
Computer Calculations ◽  
Dynamic Impacts

The paper is devoted to the problems of legal and technical making the ramp for disabled persons with scaffolds. Scaffolding system components allow you to assemble a structure that serve as the ramp and fulfil the requirements of technical conditions. From a legal point the most important is the fact that the ramp construction needs a building application. In this regard, the greatest problems is obtaining the rights to use the property for construction purposes. A big challenge is to also perform stress analysis, taking into account of dynamic impacts caused by the movement of the trolley. In this regard, the paper presents a numerical model of the ramp, static analysis, modal analysis and results of prediction of a disabled person ride on the trolley. The results of computer calculations have shown that the construction of the ramp requires the exact numerical analysis. Therefore, the best option would be in order to scaffolding companies will prepare relevant technical documentation of products which are ramps for the disabled.

scholarly journals Static Analysis and Fatigue Life Prediction of Composite Leaf Springs of Automotive Suspension System

2019 ◽  
Vol 8 (4) ◽  
pp. 5147-5150
Keyword(s):  
Fatigue Life ◽  
Fuel Efficiency ◽  
Life Cycles ◽  
Life Assessment ◽  
Leaf Spring ◽  
Commercial Vehicles ◽  
Safety Standards ◽  
The Road ◽  
Leaf Springs ◽  
Automotive Suspension

Development of vehicles with the highest safety standards and lowest carbon emissions has been one of the primary goals of the automobile manufacturers. One of the methods of achieving higher fuel efficiency is by reducing vehicle weight by minimizing the unsprung weight without compromising strength and driver comfort. The study presents the behavior of the double-bolted-end joint semi-elliptical leaf spring that is generally used in the rear suspension of lightweight cars and commercial vehicles. 65si7 grade steel is conventionally used in the above leaf springs. The study evaluates the stress distribution, deflection and fatigue life assessment of leaf springs made up of glass epoxy (62% glass fiber), carbon epoxy (40% carbon fiber), and aluminum graphite (5% graphite). The results are compared with 65si7 steel leaf spring and analysed. The analysis performed showed a weight reduction of 76.4 %, 81.1%, 65.8% respectively. The first natural frequency was approximately 1.2 times greater than the road frequency. The simulated results for fatigue life cycles of leaf spring (10e5 cycles) was observed, whereas, for the conventional steel leaf spring (2e5 cycles) was observed. The results suggest the material aluminum graphite (5% graphite) will be the best replacement, considering the overall weight to strength ratio and cost

scholarly journals Experimental and numerical analysis of the static strength and fatigue life reliability of parabolic leaf springs in heavy commercial trucks

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402094195
Author(s):  
Ufuk Taner Ceyhanli ◽  
Mehmet Bozca
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Numerical Analysis ◽  
Reliability Analysis ◽  
Static Loading ◽  
Static Strength ◽  
Design Stage ◽  
Leaf Spring ◽  
Leaf Springs ◽  
Parabolic Leaf Spring

The objective of this study is to perform experimental and numerical analysis of the static strength and fatigue life reliability of parabolic leaf springs in heavy commercial trucks. To achieve this objective, stress and displacements under static loading were analytically calculated. A computer-aided design model of a parabolic leaf spring was created. The stress and displacements were calculated by the finite element method. The spring was modelled and analysed using CATIA Part Design and ANSYS Workbench. The stress and displacement distributions on a three-layer parabolic leaf spring were obtained. The high-strength 51CrV4 spring steel was used as sample parabolic leaf springs material, and heat treatments and shoot peening were applied to increase the material strength. Sample parabolic leaf springs were tested to obtain stress and displacement under static loading conditions. By comparing three methods, namely, the static analytical method, static finite elements method and static experimental method, it is observed that results of three methods are close to each other and all three methods are reliable for the design stage of the leaf spring. Similarly, sample parabolic leaf springs were tested to evaluate the fatigue life under working conditions. The reliability analysis of the obtained fatigue life test value was carried out. It was shown that both analytical model and finite element analysis are reliable methods for the evaluation of static strength and fatigue life behaviour in parabolic leaf springs. In addition, it is determined by a reliability analysis based on rig test results of nine springs that the spring achieves its life cycle of 100,000 cycles with a 99% probability rate without breaking. Furthermore, the calculated fatigue life is 2.98% greater than experimentally obtained fatigue life mean and the leaf spring can be used safely and reliably during the service period in heavy trucks.

scholarly journals Numerical simulation of heat transfer during leaf spring industrial quenching process

2018 ◽  
Vol 19 (3) ◽  
pp. 304 ◽  
Author(s):  
Salma Slama ◽  
Mahmoud Bouhafs ◽  
Jamel Bessrour ◽  
Moez Ben Jaber ◽  
Hassan Mokdadi
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Ambient Air ◽  
Space Time ◽  
Temperature Evolution ◽  
Leaf Spring ◽  
Parabolic Profile ◽  
Leaf Springs ◽  
Steel Aisi ◽  
The Heat Transfer Coefficient

This study is carried out in partnership with the company CAVEO, manufacturer of leaf springs for vehicles. It concerns the development of a numerical model intended to follow the space-time temperature evolution of a leaf during two processing operations: hot cambering and quenching. This leaf is of a parabolic profile, made of EN-51CrV4 steel (AISI-6150). After austenitization, it passes through a cambering operation to confer it the desired deflection and then a quenching operation. This quenching is carried out in an oil bath to achieve better mechanical properties. The prediction of the temperature during quenching involves determining the heat transfer coefficient between the leaf and the oil bath. This coefficient is determined by quenching, under the same conditions as the leaf, using a standard probe of the same steel. The numerical model is based on the resolution of the transient heat equation by considering the heat loss flows towards the heterogeneous environment (ambient air, press contact and quenching oil). The results obtained by this model give the space-time temperature evolution of the leaf from the exit of the heating furnace to the exit of the oil bath. The numerical results are compared to the experimental profiles obtained through thermographic images throughout cambering and quenching operations. These results are consistent with experimental results.

scholarly journals Numerical analysis of collision of the multimaterial bird model with helicopter windshield

2017 ◽  
Vol 42 (1) ◽  
pp. 5-24 ◽  
Author(s):  
Janusz Ćwiklak
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Software Package ◽  
Simulation Research ◽  
Bird Impact ◽  
Research Findings ◽  
Head Neck

AbstractThe aim of this article is to present findings of simulation research of a stork impact with a helicopter windshield. Besides we developed a numerical model of the stork, based on biometrical data, taking into account various properties of its head, neck, torso and wings. It appears that the research findings which take into consideration the bird’s shape differ from those using a simplified bird model in the shape of a cylinder or a sphere. In order to conduct an analysis of a bird impact onto an aircraft windshield, we used the LS_DYNA software package. In the classic variant with the 3.6 kg bird model, cylinder-shaped with spherical endings, the windshield became damaged at the velocity of 200 km/h for a standard windshield (3.81 mm). For the same velocity, we conducted simulation which used the multimaterial model. It appeared that the windshield did not become damaged. Therefore, the shape of the dummy bird also affects the velocity at which the damage occurs. Too wide simplification of the dummy bird shape may lead to lowered values of the velocity.

COLLAPSE AND BUCKLING OF STAINLESS STEEL PRESTRESSED STAYED COLUMNS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Josef Machacek ◽  
Radek Pichal
Keyword(s):  
Stainless Steel ◽  
Numerical Analysis ◽  
Software Package ◽  
Ansys Software ◽  
Steel Material ◽  
Inelastic Material ◽  
Main Emphasis ◽  
Nonlinear Stress ◽  
Stainless Steel Material ◽  
Strain Relationship

Buckling and collapse of stainless steel elements loaded in compression are studied experimentally and numerically. Based on four tests of single crossarm stayed columns the numerical analysis using ANSYS software package is validated and presented in a detail. First, for a completeness, the study refers to columns with one central crossarm, but the main emphasis is devoted to columns with two crossarms located in the thirds of the element length. The analysis employed geometrically and materially nonlinear analysis (GMNIA) to respect a change of inner energy during buckling of an "ideal" (perfect) column, initial deflections of an "imperfect" column (covering various initial deflection modes and amplitude values) and nonlinear stress-strain relationship belonging to stainless steel material. The results cover both critical buckling and maximal collapse loads of the columns in compression. Finally, the important comparisons of the load capacities concerning stayed columns in compression with one/two crossarms and ratios of critical/maximal loadings, elastic/inelastic material and fixed/sliding support of the stays at the crossarms are provided. Conclusions comprise evaluation of these results and principal recommendations for the design of stayed columns.

Failure Analysis of a Fractured Leaf Spring as the Suspension System Applied on the Dump Truck

2021 ◽  
Vol 892 ◽  
pp. 89-98
Author(s):  
Husaini ◽  
Rizqi Handayani Liza ◽  
Ali Nurdin ◽  
Sadrawi Muammar
Keyword(s):  
Finite Element ◽  
Maximum Stress ◽  
Suspension System ◽  
Leaf Spring ◽  
Dump Truck ◽  
Element Analysis ◽  
Leaf Springs ◽  
Rigid Rods ◽  
Cause Of Failure ◽  
Vehicle Suspension System

A spring is a component which is designed to have relatively low stiffness compared to normal rigid rods, thereby making it possible to accept certain forces that are charged. A leaf spring is an important suspension component for heavy vehicles, as a failure of the leaf spring can cause severe if not fatal accidents. This study aims to investigate the factors that cause leaf spring failure in the form of a 125 PS dump truck vehicle suspension system. The method employed incorporated experimental and finite element analyses. The experimental work included visual observations, observation using a scanning electron microscope (SEM), hardness testing, and microstructure testing. Leaf spring modelling was conducted using Autodesk Inventor 2017 software, and the finite element analysis (FEA) was performed using Siemens ™ FEMAP V12.0.1 application software to calculate the maximum stress and strain that occurred near the crack tip of the leaf spring. The results from the analysis indicated that the cause of the fracture that occurred in leaf spring No. 3 was due to a defect discovered on the surface of the leaf spring. Based on the observations of the fracture surface, it is revealed that the cause of failure was due to the cyclic load experienced by the components during operation which caused crack propagation beginning from micro-cracks until reaching a significant dimension to cause a final fracture. In addition, the overload imposed on the leaf springs also caused maximum stress on the springs to increase, thus accelerating the failure of the leaf springs. Further results also showed that the value of the stress intensity factor, KI = 29.15 MPa.m1/2 was greater than the value of fracture toughness, KIC = 23 MPa.m1/2 of the spring material.

Failure mode investigation and re-design of heavy-duty commercial vehicle bogie bracket

2019 ◽  
Vol 43 (3) ◽  
pp. 405-415
Author(s):  
P. Thangapazham ◽  
L.A. Kumaraswamidhas ◽  
D. Muruganandam
Keyword(s):  
Maximum Stress ◽  
Suspension System ◽  
Heavy Duty ◽  
Commercial Vehicles ◽  
Road Load ◽  
Road Surfaces ◽  
Strain Data ◽  
Critical Sections ◽  
Bracket Base ◽  
Base Design

Heavy-duty commercial vehicles play a significant role in commodity logistics. For each of these vehicles, the suspension is the most essential system to support the load and road shock. Bogie type suspension system is employed to safeguard the vehicle from road shock. The bogie bracket is a juncture between the chassis and the axle in the suspension system. The bogie bracket has been identified as a critical part of the suspension system. In the present study, bogie bracket base design and modelling was performed using computer-aided engineering (CAE). The strength of the bogie was tested to identify weaker sections. Design modifications were performed to improve the strength on identified critical sections through reinforcement techniques. A road load data acquisition (RLDA) test was conducted under different road conditions to validate CAE results. Five different rough-road road surfaces were chosen for RLDA testing. Using strain gauges, strain data were acquired during the test. Corresponding stress values were obtained and maximum stress was found in all driving conditions. For the base design bogie bracket, under RLDA test, crack initiation and crack propagation were identified under vertical loads. A reinforced bogie bracket was designed and found to have a higher strength and longer expected life than that of the base design.

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