Arjstme 03 007

Advanced Research Journals of Science and Technology

ADVANCED RESEARCH JOURNALS OF SCIENCE AND TECHNOLOGY

(ARJST)

STABILIZATION OF CITYBUS CHASSIS TO REDUCE TILT EFFECT USING ANSYS WORK BENCH

2349-1845

Murari Nagendra Babu1, S N S Maruthi Vijay 2, Vinjamuri Venkata Kamesh3, 1 Research Scholar, Department of Mechanical Engineering,Aditya Engineering College, Surampalem, Andra Pradesh, India.

2 Assistant Professor , Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

3 Assistant professor , Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

Abstract City busses are one of the most efficient ways of public transportation in among all major cities and towns.

These buses required lots of maintenance to the suspension system due to rapid lode comes only onside “left side of chassis” of the bus.

This project work is to provide solution for the tilting of city busses causes by rapid load at onside of bus.

Initially literature survey is done to study previous researches on chassis and tilting of chassis.

Data collection will be done to brief about chassis, chassis material, load conditions, assembly parts and analysis approach.

Assembly of chassis and leaf spring will be prepared using CREO (pro/engineer).

Analysis will be conduct on assembly to find out the failure locations and also analysis will be conduct by adding additional supports and by changing structure.

Conclusion will be made after observing results.

*Corresponding Author: Murari Nagendra Babu, Research Scholar, Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

Published: January 20, 2016 Review Type: peer reviewed Volume: III, Issue : I

Citation: G.Ragni,Research Scholar (2016) STABILIZATION OF CITYBUS CHASSIS TO REDUCE TILT EFFECT USING ANSYS WORK BENCH PROBLEM DESCRIPTION City busses are one of the most efficient ways of public transportation in among all major cities and towns.

These buses required lots of maintenance to the suspension system due to rapid lode comes only onside “left side of chassis” of the bus.

METHODOLOGY This project work is to provide solution for the tilting of city busses causes by rapid load at onside of bus.

By applying different type of suspension methods analysis will be done and comparison will be done between existing and newly modified suspension systems, to provide suggestions to reduce maintenance for the suspension system.

INTRODUCTION TO CHASSIS The chassis forms the main structure of the modern automobile. A large number of designs in pressed-steel frame form a skeleton on which the engine, wheels, axle assem-

blies, transmission, steering mechanism, brakes, and suspension members are mounted. During the manufacturing process the body is flexibly bolted to the chassis.

This combination of the body and frame performs a variety of functions. It absorbs the reactions from the movements of the engine and axle, receives the reaction forces of the wheels in acceleration and braking, absorbs aerodynamic wind forces and road shocks through the suspension, and absorbs the major energy of impact in the event of an accident.

There has been a gradual shift in modern small car designs. There has been a trend toward combining the chassis frame and the body into a single structural element.

In this grouping, the steel body shell is reinforced with braces that make it rigid enough to resist the forces that are applied to it. To achieve better noise-isolation characteristics, separate frames are used for other cars. The presence of heavier-gauge steel components in modern separate frame designs also tends to limit intrusion in accidents.

FUNCTIONS OF THE CHASSIS FRAME: 1. To carry load of the passengers or goods carried in the body.

2. To support the load of the body, engine, gear box etc., 3. To withstand the forces caused due to the sudden braking oracceleration 4. To withstand the stresses caused due to the bad road condition.

5. To withstand centrifugal force while cornering TYPES OF CHASSIS FRAMES: There are three types of frames 1. Conventional frame 2. Integral frame 3. Semi-integral frame 86

Advanced Research Journals of Science and Technology

1. Conventional frame: It has two long side members and 5 to 6 cross-members joined together with the help of rivets and bolts. The frame sectionsare used generally. a. Channel Section - Good resistance to bending b. Tabular Section - Good resistance to Torsion c. Box Section - Good resistance to both bending and Torsion 2. Integral Frame: This frame is used now days in most of the cars and buses. There isno frame and all the assembly units are attached to the body. All thefunctions of the frame carried out by the body itself. Due to elimination oflong frame it is cheaper and due to less weight most economical also. Onlydisadvantage is repairing is difficult.

3. Semi - Integral Frame: In some vehicles half frame is fixed in the front endon which engine gear box and front suspension is mounted. It has theadvantage when the vehicle is met with accident the front frame can betaken easily to replace the damaged chassis frame.This type of frame isused in FIAT cars and some of the European and American cars.

The above image shows total assembly

STRUCTURAL ANALYSIS OF CITY BUS CHASSIS

MODELING OF CITY BUS CHASSIS IN PART DESIGN MODULE

The above image is showing imported model of two wheeler chassis from creo-parametric using IGES format(initial graphical exchanging specification) The above image shows final model of chassis

The above image shows total assembly of leaf spring

The above image is showing mesh model of object, meshing is used to deconstruct complex problem in to number of small problems using finite element method

The above image shows final model of axel

The above image is showing total deformation value

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Advanced Research Journals of Science and Technology

The above image is showing equivalent stress value

The above image is showing equivalent stress value

MODAL ANALYSIS CITY BUS CHASSIS

The above image is showing stress ratio

The above image is showing deformation

FATIGUE ANALYSIS OF CITY BUS CHASSIS WITH MODIFIED MODEL DOUBLE LEAF SPRING

STRUCTURAL ANALYSIS OF CITY BUS CHASSIS WITH MODIFIED MODEL DOUBLE LEAF SPRING

The above image is showing life based on stresses verses number of cycles(s-n) curve The above image is showing imported model

The above image is showing total deformation value

The above image is showing safety factor

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RESULT TABLE AND GRAPHS Structural Analysis of City Bus Chassis Original

With double leaf spring

With spring

7.3729

4.2106

2.7171

583.9

539.74

411.44

Strain

0.0030484

0.00318

0.002237

Safety margin

4

4

9

Stress ratio

2.3356

2.159

1.6457

Total deformation Stress

Fatigue Analysis of City Bus Chassis Original

With double leaf spring

With spring

life

5000

5000

5000

Factor of safety

0.1476

0.15971

0.20951

Alternating stress

583.9

539.74

411.44

Modal Analysis of City Bus Chassis Original

With double leaf spring

With spring

Deformation in Hz 1

30.408

26.898

46.139

Deformation in Hz 2

35.784

32.023

51.089

Deformation in Hz 3

38.141

33.895

60.348

Deformation in Hz 4

39.793

34.886

62.286

Deformation in Hz 5

44.796

40.299

74.079

Conclusion This research works done on “stabilization of city bus chassis to reduce tilt effect using Ansys work bench” to provide solution to the tilting and to reduce maintenance of suspension system.

Literature survey/review is done on chassis to understand approach in modeling and analysis segments.

Data was collected to do research review about materials, construction, fem concepts, analysis methods and etc…

A 3D assembly model was prepared using creo parametric software and exported to ansys work bench for further study.

Structural, stress tool, model (“frequency”), and Dynamic (“fatigue”) Analysis is conducted on assembly to evaluate values for the existing model.

Two other models/Assemblies are prepared by adding one more leaf spring Assembly, and spring to the left side of the chassis. Then conducted the above analysis to new models.

As per the analysis results obtained for existing model it is showing more stress, strain & low safety margin at left side of the chassis.

As per the analysis results for new models, spring model is showing good characteristics in structural and, fatigue models.

In model analysis natural frequencies are little bit more for additional spring assembly but as per the automobile construction standards we can consider frequency variation up to 65Hz. As per our research better to add spring suspension in addition to the leaf spring assembly to reduce Maintenance and to reduce tilting of chassis

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REFERENCES

Author

1. Structural Analysis of an Articulated Urban Bus Chassis via FEM: a Methodology Applied to a Case Study. journal of mechanical engineering dariocroccolo* massimiliano de agostinis nicolòvincenzi diem, department of mechanical engineering, university of bologna, italy 2. A New Design and Analysis of BUS Body Structure IOSR Journal of Mechanical and Civil Engineering Prasannapriya.Chinta *1, Dr.L.V.VenugopalRao *2 M. Tech (Machine design) Department of Mechanical, from MVGCE, chinthalavalasa, vizayanagaram.#1 Associate Professor, Department of Mechanical, from MVGCE, chinthalavalasa, vizayanagaram.#2 3. Finite Element Analysis and Optimization of Commercial Bus Body Structure International Journal of Engineering and Technical Research (IJETR) Mahesh Haldankar, A. M. Shirahatti 4. Crash Test Simulation and Analysis of a Passenger Bus Frame International Journal of Engineering Trends and Technology (IJETT) FaizanKhatri, Sanchit Jain, Prof. P. Bhaskar 5. Material Optimization and Analysis on a frameless chassis construction of Volvo bus international journal & magazine of engineering, technology, management and research Mr. S. Chandrasekhar Reddy, Associate Professor & HOD, SISTAM College of Engineering, Srikakulam, Mr. K. Eswararao, M. Tech-MACHINE DESIGN pursuing Student,SISTAM College of Engineering, Srikakulam, 6. Structural and Modal Analysis on A Frame Less Chassis Construction of Heavy Vehicle for Variable Loads Journal of Engineering Research and Applications (IJERA) K. P. Sirisha, R. LalithNarayana, A. Gopichand, Ch. Srinivas, G. Ram Balaji

Murari Nagendra Babu, Research Scholar, Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

S N S Maruthi Vijay Assistant Professor, Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

Vinjamuri Venkata Kamesh Assistant Professor, Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.

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