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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…
 

Multi body dynamic simulation of tyre traction trailer

International Centre For Automotive Tech.-Gopal Singh Rathore
  • Technical Paper
  • 2019-28-2430
To be published on 2019-11-21 by SAE International in United States
Tyre Traction Trailer is a device designed to find the Peak Brake co-efficient of C2 and C3 tyre as per ECE R117. The trailer is towed by the truck and is braked suddenly to evaluate braking co-efficient of specimen tyre. It is a single wheel trailer equipped with load cell to capture tire loads (Normal and longitudinal)while braking. Traction Trailer is modelled in MSC Adams and rigid body simulation is carried out for static stability of the system. Dynamic simulations were performed to understand locking of wheels during braking. Body frame was further modelled as flex body to perform structural analysis of the frame. The paper contains stress and deformation plots of trailer Structure under various loading conditions, change in Centre of gravity, weight transfer and forces on springs during braking and cornering, plots of tractive and normal load on tyre during braking.
 

A novel approach on range prediction of a hydrogen fuel cell electric truck

VE Commercial Vehicles Limited-L R Amruth Kumar
VE Commercial Vehicles Ltd-C Venkatesh Chandrasekar
  • 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…
 

Attenuation of Aeroacoustics Noise of a Typical Van Using Passive Devices Through CFD Simulation

SRM Institute of Science and Technology-Sundararaj Senthilkumar, Budda Thiagarajan Kannan
Vel Tech Institute of Science and Technology-Mukundan Manikandan
  • Technical Paper
  • 2019-28-0034
To be published on 2019-10-11 by SAE International in United States
The present numerical analysis aims at studying the effect of changes in profile of van on aero-acoustic noise and aerodynamic drag. The numerical analysis is carried out using commercial CFD software, ANSYS Fluent, with k-e & Large Eddy Simulation turbulence models. In present study four models of truck were analysed, including baseline model at different Reynolds numbers, namely 0.391, 0.415 and 0.457 million. In order to reduce the aero-acoustic noise, various profile modifications have been adapted on existing van model by adding a top and bottom diffuser at the rear of the truck. The comparison has been done with respect to coefficient of drag, coefficient of pressure, pressure contours, velocity vectors and streamline between all four cases. It is observed from the simulation results among different modifications of truck, adding a top and bottom diffuser of 15 degrees at the rear end of truck gives the maximum reduction in aero-acoustic noise upto 9.4% and aerodynamic drag reduction of 3.8 % as compared to baseline model, at a speed of 81 km/h.
 

Brake Pedal Feeling Comfort Analysis for Trucks with Pneumatic Brake System

Ford Motor Company-Wesley Bolognesi Prado, Silvia Faria Iombriller, Marco Andre Silva, Lázaro Renato Oliveira
  • Technical Paper
  • 2019-01-2140
To be published on 2019-09-15 by SAE International in United States
The brake pedal is the brake system component that the driver fundamentally has contact and through its action wait the response of the whole system. Each OEM defines during vehicle conceptualization the behavior of brake pedal that characterizes the pedal feel that in general reflects not only the characteristic from that vehicle but also from the entire brand.Technically, the term known as Pedal Feel means the relation between the force applied on the pedal, the pedal travel and the deceleration achieved by the vehicle. Such relation curves are also analyzed in conjunction with objective analysis sheets where the vehicle brake behavior is analyzed in test track considering different deceleration conditions, force and pedal travel.On technical literature, it is possible to find some data and studies considering the hydraulic brakes behavior. However, for pneumatic brake systems, the pedal feel theoretical study is not usual, where is normally used for these developments, exclusively the subjective evaluation which become necessary to have more specialists to define the brake pedal behavior.Throughout this article will be revised the characteristics concepts…
 

Comparative Analysis between American and European Requirements for Electronic Stability Control (ESC) Focusing on Commercial Vehicles

Ford Motor Company-Silvia Faria Iombriller, Wesley Bolognesi Prado, Marco Andre Silva
  • Technical Paper
  • 2019-01-2141
To be published on 2019-09-15 by SAE International in United States
Analysis of road accident has showed that an important portion of fatal crashes involving commercial vehicles is caused by rollovers. ESC systems in commercial vehicles can reduce rollovers, severe understeer or oversteer conditions and minimize occurences of jackknifing conditions. Several studies have estimated that this positive effect of ESC on road safety is substantial. In Europe, Electronic Stability Control (ESC) is expected to prevent by far the most fatalities and injuries: about 3,000 fatalities (-14%), and about 50,000 injuries (-6%) per year. In Europe, Electronic Stability Control Systems is mandatory for all vehicles (since Nov 1st, 2011 for new types of vehicle and Nov 1st 2014 for all new vehicles), including commercial vehicles, trucks and trailers. On 2015, NHTSA published Federal Motor Vehicle Safety Standard (FMVSS) No. 136, Electronic stability control systems for heavy vehicles, requiring electronic stability control (ESC) systems on truck tractors and buses with a gross vehicle weight rating greater than 11,793 kilograms (26,000 pounds) that were implemented until 2017. In South America, CONTRAN Resolution 641/2016 establishes mandatory installation of Electronic Stability…
 

Braking with a Trailer and Mountain Pass Descent

General Motors LLC-David B. Antanaitis, Brent Lowe
  • Technical Paper
  • 2019-01-2116
To be published on 2019-09-15 by SAE International in United States
A truly strange - but very interesting - juxtaposition of thought occurs when considering customer’s deceleration needs for towing heavy trailers in mountainous regions, and the seemingly very different area of sizing brakes for Battery Electric Vehicles (BEV) and other regenerative braking-intensive vehicle applications, versus brakes for heavy-duty trucks and other vehicles rated to tow heavy trailers. The common threads between these two very different categories of vehicles include (a) heavy dependence on the powertrain and other non-brake sources of energy loss to control the speed of the vehicle on the grade and ensure adequate capacity of the brake system, (b) a need to consider descent conditions where towing a heavy trailer is feasible (in the case of heavy trailer towing) or initiating a descent with a full state of charge is realistic (in the case of BEVs), which forces consideration of different descents versus the typical (for brake engineers) mountain peak descent. In this paper, a vehicle operator-based requirement is derived that integrates engine (or motor), transmission (or gearbox), driveline, brake system, brake cooling,…
 
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Truck and Bus Aerodynamic Device and Concept Terminology

Truck and Bus Aerodynamics and Fuel Economy Committee
  • Ground Vehicle Standard
  • J2971_201908
  • Current
Published 2019-08-02 by SAE International in United States

This SAE J2971 Recommended Practice describes a standard naming convention of aerodynamic devices and technologies used to control aerodynamic forces on truck and buses weighing more than 10000 pounds (including trailers).

 
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DSD helps ‘balance the books’ for buying electric truck technology

SAE Truck & Off-Highway Engineering: August 2019

Stuart Birch
  • Magazine Article
  • 19TOFHP08_08
Published 2019-08-01 by SAE International in United States

In the discerning world of truck operations, where procurement decisions must be based on total cost of ownership (TCO), the case for moving to environmentally sustainable electric powertrains for heavy commercial vehicles that demand high initial capital outlay and bring concerns over range limitations, yet lower running costs, is a constant conundrum. But it may be solved via a new simulation system that matches powertrain characteristics to specific applications of an operator to achieve “significant” cost savings without compromising required range.

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SAE Truck & Off-Highway Engineering: August 2019

  • Magazine Issue
  • 19TOFHP08
Published 2019-08-01 by SAE International in United States
Electric machines find their niche Smaller machines working in cities are particularly ripe for electrification, but most off-highway applications will retain the internal-combustion engine.Big data, big benefits Data mining helps users and equipment developers use data from on-vehicle sensors to work more efficiently.Data connectivity in harsh environments Ensuring high-speed data transmission requires OEM designers to think more about components, placement and the impact of environmental conditions early in design.Trucks with intuition Perceptive Automata partners with Volvo Trucks to demonstrate AI technology that can determine when pedestrians will cross the road.Change is afoot Cummins and its CTO help focus the 2019 SAE COMVEC on the fast-shifting technology landscape that faces both on- and off-highway sectors.Editorial AI, ADAS & AVs-oh my!Holistic hydraulic designs add more sensors, controlsDSD helps 'balance the books' for buying electric truck technologyJCB prepared to meet EU Stage V emissionsProtecting a cyber-physical remote diagnostic communication system against cyberattacksSKF employs digital tools to enhance bearing design, performanceNew Mercedes-Benz Actros loaded with ADAS, active safety techQ&A Peloton CEO Josh Switkes explains Level 4 'automated following' platooning