Your Selections

Racing vehicles
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Rework of an in-line two-cylinder engine for the application in Formula Student

FH JOANNEUM Graz, Department of Automotive Engineering-Michael Feigl B.Sc, Dominik Rößmann B.Sc, FH-Prof. DI Michael Trzesniowski
  • Technical Paper
  • 2019-32-0532
To be published on 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Formula Student is an international design competition, where students all over the world develop, design and build their own race car and afterwards compete with each other at different disciplines at events worldwide. The development process includes every module of the race car and the team of joanneum racing graz has focused on the powertrain since the beginning.The following paper contains an overview of the reworking process of an in-line two-cylinder engine for the application in Formula Student. The intention was to increase the BMEP and at the same time reach a desired power/weight ratio of the engine. The process of selecting the most appropriate turbocharger by means of experimental testing on an engine dynamometer, as well as its optimization by means of numerical simulation, is outlined. Subsequently, the paper discusses the challenges regarding valve timing and finding the best trade-off between power and residual gas with the help of 1D-simulations. The necessary implementation of an intercooler and its efficiency optimization is also addressed. Finally, the calibration and optimization of the setup on the engine…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Engine calibration and driveability evaluation of a racecar

Federal University of Santa Maria-Aleff Goulart, Alexandre Piccini, Alice Müller, Felipe Balbom, Mario Martins, Pedro Carvalho
  • Technical Paper
  • 2019-36-0126
Published 2020-01-13 by SAE International in United States
The passenger car automakers are always competing to excel in vehicle characteristics related to passenger comfort and driveability aspects. The engine calibration is a theoretical and experimental procedure with the intention to extract maximum efficiency from the engine and guarantee satisfactory levels of driving for both conventional and racing cars. This paper describes the calibration procedure of a Formula SAE race car engine. The engine was a four cylinder 600 cm3 four-strokes with modified intake and exhaust systems, controlled by an engine control unit (Motec M800 ECU). These engines present optimized characteristics for high speed, in exchange for some combustion degradation in some specific operating conditions at low speed that may impair vehicle driveability. Therefore, good tip-in reaction and the progression of the torque delivery are fundamental criteria to increase the vehicle performance, specially, to those submitted to short acceleration distances. The related criteria to the vehicle dynamic comfort has objective values to measure the abrupt engine speed transactions, jerks and acceleration variability related to torque variation. Improvement on such parameters can be obtained by…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Optimization of Race Car Front Splitter Placement Using CFD

Delhi Technological University-Sourajit Bhattacharjee, B.B. Arora, Vishesh Kashyap
  • Technical Paper
  • 2019-01-5097
Published 2019-12-30 by SAE International in United States
The behavior of flow over an automobile’s body has a large effect on vehicle performance, and automobile manufacturers pay close attention to the minimal of the details that affect the performance of the vehicle. An imbalance of downforce between the front and rear portion of the vehicle can lead to significant performance hindrances. Worldwide efforts have been made by leading automobile manufacturers to achieve maximum balanced downforce using aerodynamic elements of vehicle. One such element is the front splitter. This study aims to analyze the aerodynamic performance of automobile at various splitter overhang lengths using Computational Fluid Dynamics (CFD). For the purpose of analysis, a three-dimensional (3D) CFD study was undertaken in ANSYS Fluent using the realizable k-ε turbulence model, based on the 3D compressible Reynolds-Averaged Navier-Stokes (RANS) equations. The National Advisory Committee for Aeronautics (NACA) 4412 was taken as profile for the fixed-length splitter attached to a NASCAR 2019 model body. Vehicle speeds of 200, 250, and 300 km/h were considered in order to simulate the velocity of a race car. Drag coefficient, lift…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Aerodynamic Analysis of Race Car Using Active Wing Concept

ARAI Academy-Prakash P Bhanushali
Automotive Research Association of India-Mohammad Rafiq Agrewale, Kamalkishore Vora
  • Technical Paper
  • 2019-28-2395
Published 2019-11-21 by SAE International in United States
In high speed race cars, aerodynamics is an important aspect for determining performance and stability of vehicle. It is mainly influenced by front and rear wings. Active aerodynamics consist of any type of movable wing element that change their position based on operating conditions of the vehicle to have better performance and handling. In this work, front and rear wings are designed for race car prototype of race car. The high down force aerofoil profiles have been used for design of front and rear wing. The first aerodynamic analysis has been performed on baseline model without wings using CFD tool. For investigation, parameters considered are angle of attack in the range of 0-18° for front as well as rear wing at different test speeds of 60, 80, 100 and 120 kmph. The simulation is carried out by using ANSYS Fluent. The simulation results show significant improvement in vehicle performance and handling parameters. To validate the results, a scaled model prototype is manufactured and tested in wind tunnel.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Design of a Novel Electro-Pneumatic Gear Shift System for a Sequential Gearbox

Vellore Institute of Technology-Jeevesh Jain, Vaibhav Mittal, Dore Ranganath Srinivasa Raghuraman, Shivam Singh Rathore, Sumit Nilesh Vadodaria
Published 2019-10-11 by SAE International in United States
This paper describes the design of a novel pneumatic gear shifting system to replace the existing gear stick manual shifting system for ease of the driver while shifting gears. The aim of this work is to have a semi-automatic shifting (pneumatic shifting) removing the need for the driver clutch operation. The system consists of a solenoid valve, CO2 gas-pressurized cylinder, double-acting cylinder, and single-acting cylinder. On basis of the signal received the gear needs to be changed, the shifter opens or closes a magnetic valve assembly. The solenoid valve allows the compressed air into the piston that comes from a pressurized cylinder, in order to create the effect of shifting gears. The pedal shifter and buttons are used to shift the gears. The pedal shifter was designed by using a 3-D printing technique using PLA material. The microcontroller used is ATMEGA-328 in this system. There are three switches, one for upshift, downshift, and clutch respectively. An algorithm has been created in a microcontroller for a sequential gearbox of CBR 600RR. The system has been so…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Design and Testing of Custom Brake Caliper of a Formula Student Race Car

Vellore Institute of Technology-Mosam Ugemuge, Sreethul Das
Published 2019-10-11 by SAE International in United States
A Formula Student race car is a car designed and manufactured for speed, performance, and competition. For a car to have high speed and performance, their parts also need to be lighter with being able to sustain the dynamically occurring stresses. Effective braking is a crucial factor which determines the performance of the car. This paper focuses on designing a brake caliper on the basis of calculations done with respect to a Formula Student race car, selecting a material which is of low density but with higher strength which can be easily manufactured with low cost and analyzing the design. Further, the manufactured part is also tested statically to ensure proper working before being tested on an actual formula student race car. The caliper is again tested dynamically, where the caliper is mounted on rear wheels of the car. To ensure proper working, brake pressure sensors are being mounted which also helps to validate the calculations. The computer-aided design model is created in Solidworks 2017 and is analyzed for the factor of safety, stress, and…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A New Approach for Development of a High-Performance Intake Manifold for a Single-Cylinder Engine Used in Formula SAE Application

SAE International Journal of Engines

VIT University, India-Thangavel Venugopal, Routray Anubhav
  • Journal Article
  • 03-12-04-0027
Published 2019-07-26 by SAE International in United States
The Formula SAE (FSAE) is an international engineering competition where a Formula style race car is designed and built by students from worldwide universities. According to FSAE regulation, an air restrictor with circular cross section of 20 mm for gasoline-fuelled and 19 mm for E-85-fuelled vehicles is to be incorporated between the throttle valve and engine inlet. The sole purpose of this regulation is to limit the airflow to the engine used. The only sequence allowed is throttle valve, restrictor and engine inlet. A new approach of combining Ram theory and acoustic theory methods are investigated to increase the performance of the engine by designing an optimized intake runner for a particular engine speed range and an optimized plenum volume in this range. Engine performance characteristics such as brake power, brake torque and volumetric efficiency are taken into considerations. Ricardo WAVE simulation software is used to evaluate the impacts of plenum volume and runner length on engine performance based on the afore-mentioned performance characteristics. Various intake manifold designs are iterated in accordance with the surface…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

F1 STREAMLINES FOR CLOSER RACING

Automotive Engineering: May 2019

Dan Carney
  • Magazine Article
  • 19AUTP05_05
Published 2019-05-01 by SAE International in United States

In the downforce vs. turbulence battle, Formula 1 enacts technical changes to rev up the on-track spectacle.

Ongoing aerodynamic development of Formula 1 racecars has the most obvious goals of increasing the cars' downforce and reducing their drag to produce the fastest speeds and quickest lap times.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Developing a Track Simulation Tool for Formula Student Race Cars Using Python

Ain Shams University-Sherif Khedr, Hashim Elzaabalawy, Mohamed Abdelaziz
Published 2019-04-02 by SAE International in United States
Formula Student is a competition held on yearly basis in multiple countries around the world. Students from different universities participate in this competition implementing some of the most sophisticated techniques in design and analysis of Formula Student car performance. In this research a track simulation tool is developed using Python to analyze the effect of different systems on the car performance, and to test the performance of the car on the Autocross track. For simplicity, the car is modeled as point mass in straight roads and corners. Intensive studies were carried out leading to a conclusion that, in some cases, point mass modeling leads to some inaccuracy and in others it provides the solution. Therefore, to achieve simulation accuracy, the point mass model was replaced with four degrees of freedom, or “bicycle”, model counterpart when it couldn’t provide an accurate solution, and the difference between both models results are discussed. The brake bias ratio selected for the brake system versus human force applied on the brake pedal was optimized and the optimization technique is discussed…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Evaluation of Ecosystem for Design Assessment and Verification by BAJA Dynamometer Capstone Team at the University of Nebraska

Imagars LLC; Portland State University-Baldur Steingrimsson
Portland State University-Bao Phan, Sung Yi
Published 2019-04-02 by SAE International in United States
This paper summarizes the outcome of an evaluation by capstone design teams from the Department of Mechanical and Materials Engineering at the University of Nebraska-Lincoln, of the Ecosystem for Design Assessment and Verification. The Ecosystem is a design decision support tool whose main goal is to identify design oversights, defined in terms of deviations from the design process or unfulfilled design requirements, early in the design process, guide designers through the design process, and teach proper design techniques. It is capable of automatically assessing students’ design work against ABET compliant learning outcomes. The Ecosystem offers many additional features found useful by capstone design teams, such as automatic generation of formatted project reports as well as interfaces to tools for team communications (Google Drive, Dropbox or OneDrive) or development (e.g., SolidWorks, CATIA, NX Unigraphics or AutoCAD).The Ecosystem was recently evaluated by a capstone team working on an automated straw flattening machine and again during a following semester by a team designing a dynamometer used for measuring the engine power of a BAJA race car.The paper draws…
This content contains downloadable datasets
Annotation ability available