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Ride- Comfort Analysis for Commercial Truck using MATLAB Simulink.

ARAI Academy-Sarnab Debnath
Automotive Research Association of India-Mohammad Rafiq Agrewale
  • Technical Paper
  • 2019-28-2428
To be published on 2019-11-21 by SAE International in United States
Ride Comfort forms a core design aspect for suspension and is to be considered as primary requirement for vehicle performance in terms of drivability and uptime of passenger. Maintaining a balance between ride comfort and handling poses a major challenge to finalize the suspension specifications. The objective of this project it to perform ride- comfort analysis for a commercial truck using MATLAB Simulink. First, benchmarking was carried out on a 4x2 commercial truck and the physical parameters were obtained. Further, a mathematical model is developed using MATLAB Simulink R2015a and acceleration- time data is collected. An experimentation was carried out on the truck at speeds of 20 kmph, 30 kmph, 40 kmph and 50 kmph over a single hump to obtain actual acceleration time domain data. The model is then correlated with actual test over a single hump. This is followed by running the vehicle on Class A, B & C road profiles to account for random vibrations. Similarly, a simulation is done on MATLAB Simulink and a correlation is established between simulated and actual…
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PMSM motor drive for Electric Vehicle applications

Vaishnavi V
  • Technical Paper
  • 2019-28-2475
To be published on 2019-11-21 by SAE International in United States
To control air pollution in urban areas and to reduce carbon print in the cities, nowadays EV’s are preferred over IC engine vehicles. Earlier Electric vehicles used DC motor and Induction motors. But Brushless Permanent Magnet motors are preferred over Induction motor for EV’s due to their High Torque density, high-power density and highly efficiency. Prevalent Electric vehicles today have Brushless DC motors. Compared to BLDC, PMSM motor have smoother control and negligible torque ripplesThus, PMSM motor is preferred over BLDC for Electric Vehicle, because of its sinusoidal back emf which results in smoother control, and results into smoother and more comfortable driving experience to users. Methodology Sensor based field-oriented control (FOC) is implemented in 48 V 5kW Interior PMSM motor. . To start the Synchronous motor initial position of the rotor magnetic field should be known. After rotor alignment, incremental encoder is used to detect the rotor position or rotor flux position. As incremental encoder gives relative position, rotor is aligned to a known position, and then algorithm moves to closed loop FOC. In…
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Effect of Tyre inflation Pressure on Rolling Resistance of Tyre

International Centre for Automotive Technology-Siddharth Tripathi, Amit Kumar Karwal, Mukund Mishra, Dushyant Wazir
  • Technical Paper
  • 2019-28-2415
To be published on 2019-11-21 by SAE International in United States
Rolling resistance, is nothing but the rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is,not all the energy needed for deformation of the wheel, roadbed, etc. It is recovered when the pressure is removed, in the form of hysteresis losses and permanent deformation of the tyre surface. So, the rolling resistance contributes to the deformation of roadbed as well as tyre surface of the vehicle. Factors contributing in rolling resistance are tyre inflation pressure, wheel diameter, speed, load on wheel,, surface adhesion, sliding, and relative micro-sliding between the surfaces of contact. In this concerned paper we are significantly working on effect of tyre inflation pressure on rolling resistance and taking all other factors constraint.
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Improved Performance of Electric Vehicles with Supercapacitor

Spel Technologies Private Limited-Rajendrakumar Laxminarayan Sharma
  • Technical Paper
  • 2019-28-2468
To be published on 2019-11-21 by SAE International in United States
Background: Due to Environmental concern worldwide, Mobility is under pressure to shift gear from fossil fuel to Electric. This is Rebirth of Electric Mobility is with state’s initiative, but it is facing bigger challenges than the 1900s era. Fossil fuel vehicles have already carved the benchmark on ease of range per charge, and time of charge (filling of fossil fuel), which needs to be at least matched by Electric Vehicles. The success of electric vehicles will not only be driven by state policy but also by performance and Economic Viability. While at this introduction level state is trying best to offset cost by way of subsidy/tax-sops offering. So, in clear terms “Performance of Electric Vehicles” need to be addressed and enhanced to put them in main stream in place of fossil fuel vehicles. In last 100 years there has been significant technological development in Motors, and Energy Storage, which is base of Electric mobility. Motors have fared well on technological development front, but energy storage has been struggling to keep pace with this Power hungry…
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Transient Response Analysis and Synthesis of an FSAE Vehicle using Cornering Compliance

SRM Institute of Science and Technology-Nanthakumar Ajd, Pranav Suresh, Shubham Subhnil, Vasanthkumar CH
  • Technical Paper
  • 2019-28-2400
To be published on 2019-11-21 by SAE International in United States
OBJECTIVE Race vehicles are designed to achieve higher lateral acceleration arising at cornering conditions. A focused study on the steady state handling of the car is essential for the analysis of such conditions. The transient response analysis of the car is also equally important to achieve best driver-car relationship and to quantify handling in the range suitable for a racing car. This research aims to investigate the design parameters responsible for the transient characteristics and optimize those design parameters. This research work examines the time-based analysis of the problem to truly capture the non-linear dynamics. Apart from tires, chassis can be tuned to optimize vehicle handling and hence the response times. METHODOLOGY To start with, the system is modelled with governing parameters and simulation is carried out to set baseline configurations. Steady state and transient handling simulations run independent of each other with independent logic, coded on MATLAB. The static testing of the chassis is carried over using a Kinematic & Compliance (K & C) testing rig to get Compliance Budget and hence the calculated…
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A novel approach on range prediction of a hydrogen fuel cell electric truck

VE Commercial Vehicles, Ltd.-C Venkatesh Chandrasekar, L R Amruth Kumar
  • Technical Paper
  • 2019-28-2514
To be published on 2019-11-21 by SAE International in United States
A novel approach on range prediction of a hydrogen fuel cell electric truck C.Venkatesh - Manager - Product Development, Sustainable Mobility & Advanced Technologies Abstract: A novel approach on range prediction of a hydrogen fuel cell electric vehicle Abstract: Today's growing commercial vehicle population creates a demand for fossil fuel surplus requirement and develops highly polluted urban cities in the world. Hence addressing both factors are very much essential. Battery electric vehicles are with limited vehicle range and higher charging time. So it is not suitable for the long-haul application. Hence the hydrogen fuel cell based electric vehicles are the future of the commercial electric vehicle to achieve long range, zero emission and alternate for reducing fossil fuels requirement. The hydrogen fuel-cell electric vehicle range, it means the total distance covered by the vehicle in a single filling of hydrogen into the onboard cylinders. And here the prediction of the driving range is essential based on optimal parameters (vehicle acceleration, speed, trip time etc.) before the start of the trip. If the driver starts the…
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A Comparative study to assess the effect and cause of Ride Quality & Comfort of Passenger Vehicle with Subjective Correlation

Advanced Structures India-Rahul Ramola, Anuj Jha
Vellore Institute of Technology-Aniruddha Deouskar
  • Technical Paper
  • 2019-28-2410
To be published on 2019-11-21 by SAE International in United States
Research Objective The importance of evaluating ride comfort with high degrees of accuracy objectively and its correlation with subjective perception is increasing day by day because of the long duration of the driving experience. The complex motion of the vehicle which is the combination of heave, roll and pitch motion is responsible for causing extreme uneasiness to the driver as well as the passenger. In this paper, ride comfort evaluation is done on the highway with similar traffic conditions with the help of Vibration Dose Value Analysis, Suspension Working Space and Ride Diagram methods for two hatchbacks and its correlation with the complex motion like choppiness of the vehicle is established that will help us to enhance the driver ride experience. Methodology The ride testing is performed for two hatchbacks on a highway road with different kinds of terrain ranging from highly uneven road roughness to moderately smooth surface for a speed range of 60-100 kmph. The road environment is chosen for testing in order to record and analyze the most practical vehicle response to…
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Design Analysis and Simulations of Components of an All-Terrain Vehicle

BITS Pilani-Pranjal Shukla, Konark Joshi, Utkarsh Rastogi, Ajith Reddy Moola
Published 2019-10-11 by SAE International in United States
A single seater All-Terrain Vehicle (ATV) is conceptualized in this paper which covers the extent of designing and simulations ranging from static structural, fatigue analysis, explicit dynamics etc. Solidworks and Ansys Workbench have been used as the tools for the simulation. Our aim was to design and fabricate a vehicle which is light weight (<200Kgs), easily maneuverable in harsh driving conditions and also scores high in affordability and maintenance.This report also contains the design consideration of the chassis, steering, suspension, braking, powertrain. Simulation results of components like hubs, knuckles, A-Arms, chassis are done with special focus on modelling based on real time forces and behaviors. MATLAB Simulink models are used and explained for the suspension model.The vehicle was fabricated in-house using various fabrication methods of TIG Welding, Vertical CNC machines etc. The strength tests for the specimens of welding were checked for the safety of the chassis. The vehicle was tested on tracks for braking, steering and acceleration and further modifications were made in the design to incorporate the iterations.
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Design Analysis and 3D Printing of Non-Pneumatic Tyre

VNR VJIET-Prashanth Kannan, Amjad Shaik, Yogesh Kumar, Naga Sumanth Bareddy
Published 2019-10-11 by SAE International in United States
The major concern when implementing maneuvers are acceleration, braking and steering for the safety control which ultimately depends on the road and tyre surface friction. To withstand the vertical loads and maintain good traction with contact surface pneumatic tyres with high volume of pressurized air are required. To improve the comfort, handling and grip with low unsprung mass, non-pneumatic tyres are needed which are not reinforced with air pressure. The decreased effect of rolling resistance, added cushioning effect and better cellular shear band design increased the performance level than pneumatic tyres. Here, air is replaced by poly-composite spokes that eliminates the possibility of tyre going flat. This paper mainly discusses the environmental impact and stability issues of conventional pneumatic tyres and also focuses on the various possible design and components of an airless tyre. This paper also presents the modelling and analysis of non-pneumatic tyre followed by 3D printed sealed model using ABS (Acrylonitrile Butadiene Styrene) and TPU (Thermoplastic Polyurethane). Honeycomb structured cellular shear band made of polyurethane are tested with different shear band angles…
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Fuel Efficiency Improvement in Automatic Transmissions by Lockup Slip Methodology

Mahindra & Mahindra, Ltd.-Arun Sukumar
Published 2019-10-11 by SAE International in United States
Increasing of automatic transmissions in passenger cars is based on pleasure of driving, smooth acceleration and easy operation makes the customer satisfaction. Challenges beyond 2020 is BS VI emission norms in India - a very tough goals on CO2& NOx reduction in Gasoline & Diesel vehicles. But its setback in lower fuel economy.To support & enhance fuel economy in Automatic transmissions as part of drivetrain technologies, this article discusses about the power losses in torque converters and experiments on the actual Automatic transmission (AT) vehicle on-road to understand the real city driving behavior in the aspects of gear utilization & gas pedal utilization throughout the entire traffic conditions. With that data research, slip area and slipping conditions is determined & clutch slip control is enabled at area in torque converter by ensuring that NVH parameters are not affected.The addition of the Lock-up Slip system add value in terms of “Joy of Driving” by providing a 2-3% improvement in fuel economy over the previous one.
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