https://araijournal.com/index.php/arai/issue/feed ARAI Journal of Mobility Technology 2022-05-13T12:13:13+0530 Dr. A. Madhava Rao smtp@araijournal.com Open Journal Systems <p><strong>ISSN: 2583-3707 (Online)</strong></p> <p><strong>About the Journal: </strong>The ARAI Journal of Mobility Technology is an online and print technical journal in automotive and its related fields. It is a publication from <a href="https://www.araiindia.com/" target="_blank" rel="noopener">ARAI</a> in collaboration with <a href="https://bspublications.net/main.php" target="_blank" rel="noopener">BSP Books Pvt. Ltd.</a>, Hyderabad. Its aim is to explore the knowledge of automotive professionals and to meet the needs of both academia and industry in terms of research and development. This journal will endeavour to promote research, innovation, and new ideas in various fields of automotive technology. It is a peer-reviewed, quarterly publication. <a title="Read more &gt;" href="https://araijournal.com/index.php/arai/about" target="_blank" rel="noopener"><strong>Read more &gt; </strong></a></p> https://araijournal.com/index.php/arai/article/view/103 Bilateral Facet Dislocations With and Without Head Impact Sustained by Restrained Occupants 2022-04-06T14:52:26+0530 Dr. Chandrashekhar K. Thorbole chandrathorbole@injurybiomechanics.com <p>This paper aims to understand the different injury mechanisms involved with traumatic Bilateral Facet Dislocation (BFD) and fracture of the cervical spine. The intent is to demonstrate and elucidate tensile and compression induced injury mechanisms producing BFD by employing real-world crash investigations in association with all the past laboratory testing and studies done by numerous researchers. The study indicates that in a frontal crash scenario, maintaining the position of the shoulder belt is paramount, and any migration towards the base of the neck allows the fulcrum formation that amplifies distractive moments on the neck producing BFD. Similarly, in a rollover crash scenario, roof intrusion magnitude, and its rate along with roof deformation pattern can impose a rotational constraint on the head and plays a vital role in producing BFD. Roof design must address the formation of pocketing in the roof due to deformations imposing rotational head constraint exposing the neck to buckling and subsequent BFD as the roof intrusion continues.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/104 Failure Analysis of Front Axle Wheel Studs in Small Commercial Vehicles 2022-04-06T15:05:22+0530 Mahadevan Pichandi Mahadevan.P@ashokleyland.com Jagadeesh Selvaraj Jagadeesh.S@ashokleyland.com <p>Irrespective of specific applications, the Small Commercial Vehicles (SCV) are always subjected to severe working conditions, especially the front wheels experience higher loads than design intended due to higher overloading by customers, driver abuse and frequent brake applications. The front axle wheels fasten system plays a key role for safety of the vehicle and pedestrian. The wheel separation can lead to serious injuries to passengers of the vehicle and pedestrian or from another vehicle maneuvering including fatalities. In this project investigation, the causes that promote failure of front axle wheels fasten system and subsequent wheels separation of SCV is analyzed carefully. Metallurgical analysis of the failed fasten system shows that it is characterized by a series of synergetic steps that include plastic deformation of nuts and studs caused due to disproportionate torque tightening practices. Also, the effect of other external factors that lead to deterioration of stud fatigue life such as road camber and driver abuse are analyzed. Based on this promise, the present investigation deals with detailed analysis of the root causes contributing such failures are analyzed and discussed in this paper. This study would help the fellow designers to select optimized fastening system considering all the parameters influencing wheel separation due to stud failures for SCV, passenger vehicles and heavy duty trucks.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/105 Effects of Vortex Generators on Aerodynamic Drag Force in the Hatchback Type Car 2022-04-06T15:24:08+0530 Sanjay D. Patil sanjaypatil365@gmail.com Vikas T. Mujmule sdpatil.auto@gcoeara.ac.in Ajay P. Mahale sdpatil.auto@gcoeara.ac.in Suhas A. Jagtap sdpatil.auto@gcoeara.ac.in Ganesh S. Patil sdpatil.auto@gcoeara.ac.in <p>Aerodynamic drag force is one of the main obstacles on moving a vehicle. This force significantly reduces a vehicle's speed and, as a result, its fuel efficiency. In today’s scenario, fuel efficiency is a prime concern in vehicle design, so a reduction in aerodynamic drag force is highly important. Road vehicles are designed to pass through surrounding air and displace it as efficiently as possible. Due to the rear shape of a car, airflow suddenly separates from the vehicle at a point near the rear windscreen. This flow separation at the rear end of the car is responsible for the drag force, which is the main opposition to the vehicle's forward motion. This drag force is proportional to the square of the velocity of the car and, as a result, increases significantly after certain speeds. To reduce the drag force, the flow separation at the rear end needs to be avoided. In hatch-back type cars, to avoid this separation, a vortex generator (VG) can be used. VG creates the vortex at the rear end of the car, which delays the flow separation and, ultimately, drag is reduced significantly. In this work, the effect of a VG on the pressure distribution, velocity destitution and aerodynamic drag on the hatchback type car, is studied by the numerical simulation. The numerical simulations are carried out using the ANSYS FLUENT® software. The simulation setup is validated with wind tunnel test results.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/106 Deep Learning Model for Prediction of Air Mass Deviation Faults 2022-04-06T15:39:51+0530 Karthik Chinnapolamada karthik.chinnapolamada@daimler.com <p>Major Systems of an internal combustion Engine are Air System, Fuel system, and Exhaust system. Any malfunction in these systems increases emissions. OBD legislation mandates to monitor these systems for any faults and appropriate action should be taken in case of the any faults which increase vehicle emissions. The idea of the paper is to find the Air mass flow deviation faults using datamining and machine learning based approach. Detection of fault is classifying whether system is faulty or not. Objective is to create a deep learning model using the available vehicle data to classify the system for a fault. Three main inputs for the Air Mass flow in an internal combustion Engine are<br>1) Fresh Air which measure using Mass Air Flow sensor<br>2) Low Pressure EGR<br>3) High Pressure EGR<br>During vehicle lifetime, due to different real vehicle operating conditions and environmental conditions, deviation in the set point of air mass flow and actual mass flow are possible to an extent, which can affect vehicle emissions. Deviation in the Air Mass flow can be caused by intake Air mass, LP-EGR, HP-EGR. The Aim of the project is to create the deep learning model for Air Mass Flow Hi and Low faults using the available data, and associate the fault to the component in the Intake Air System.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/107 Development and Implementation of Remote Duty Cycle Data Acquisition and Analysis 2022-04-06T15:50:02+0530 Sathish Kumar P SathishKumar.P22@ashokleyland.com Kumar P Kumar.P2@ashokleyland.com Dayalan P Dayalan.P@ashokleyland.com <p>In the competitive automotive industry, launch of a new vehicle has become a norm to stay ahead, also the vehicle manufacturers are competing in terms of increased warranty on the new launch. Hence it is imperative for rigorous validation of new vehicle in very short period and requires to map customer usage pattern in least possible time. This work is based on an extension of internet of things (IOT), which provides a tool of capturing vehicle duty cycle by using combination of analog and digital sensors with appropriate ADC. The system is enabled with algorithm/ coded to log result, whenever measured physical parameter goes above/below predetermined level. The work involves implementation of an auto start and auto shutdown of the system based on vehicle ignition. Thus, this paper presents a system that is capable of continuous, real time recording and edge computing (auto post processing) physical quantity and ensures complete elimination of human interface, thereby enabling Remote Data Acquisition, Analysis and Reporting system (Proposed system). The proposed system is fit and forget and cost-effective solution, it can be fitted in any number of vehicles to acquire data for large number of kilometers to map system level usage pattern. Against the conventional method with limited kilometers of data to map customer pattern. The present work is an implementation of Remote Data Acquisition, Analysis and Reporting system in measurement of required vehicle parameters of temperature and humidity in field working conditions.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/108 Aerodynamic Effect on Stability and Lift Characteristics of an Elevated Sedan Car 2022-04-06T15:58:22+0530 Amrutheswara Krishnamurthy amruthisac@gmail.com Dr.Suresh Nagesh suresh.nagesh@pes.edu <p>There is a strong interaction between air and vehicle components. Aerodynamics plays a significant role in a vehicle's fuel efficiency. The contact patch load between the tire and road is directly related to the vehicle load. In this research, the lift forces generated due to the additional wing attached to the car model with different spans and heights of the wing location from the car body is considered for study. The loads due to change in Angle of Attack (AOA) and their effect on the tire loads are studied. The upward vertical force produced from aerodynamic loads reduces the wheel load of the car virtually. A tire's coefficient of friction would decrease with upward vertical force. This balance load implies that a lightweight car would make more efficient use of its tires than a heavier car. ANSYS Fluent is used for the Computational Fluid Dynamics (CFD) study. The validation of airflow characteristics, lift and drag forces from simulations are done with wind tunnel testing data. Varying the angle of attack, wingspan, height between the car and the wing's lower surface, one can increase the capacity of the payload by 10% or fuel efficiency by 10% to 20%.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/111 Design & Development of Electro Hydraulic Control Valve for Integration of Hoist and Steering System of a Dump Truck (35t) 2022-04-06T16:12:07+0530 Sathyarayana H. D. gwsatya@beml.co.in Kamasani Bujji Babu gwbabu@beml.co.in Renukaraj Y. M. gwrenu@beml.co.in Ankit Shrivastava gwankit@beml.co.in Mahadevan B. gwmaha@beml.co.in <p>The intent of this paper is to propose a system to control the steering operation and hoist operation of the Dump truck through combination of electro hydraulic valves and priority valve housed in Integrated manifold block. Electro hydraulic control valve(EHCV), and Electronic controller unit (ECU) for steering and hoist operation of the dump truck. The orbitrol valve consists of load sensing line, when the Orbitrol valve sense an effort on the steering wheel by the operator, the load sensing line will give a feedback signal to the electro hydraulic valve, which will divert the pressurized hydraulic oil to the steering system for steering operation, else the hydraulic oil is available for hoist operation. The hoist operation is control through Electronic Controller Unit (ECU). If there is no signal from the controller for hoist operation the hydraulic oil will flow back to tank. The Electronic controller will energize the combination of solenoid operated valves, depending upon the input received from operator through the momentary switch (Raise Switch, Lower/Float Switch, Hold Switch) mounted inside the cabin, which will allow the flow of pressurized hydraulic oil to the hoist cylinder for body raise and lower operation through electro hydraulic control valve. The electronic controller memorizes the signal from momentary switch and energizes the solenoids as per the logic till the next input signal receive by controller.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/113 On Using Kriging Response Surface Method for EV Battery Pack Structural Response Prediction and Mass Optimization 2022-04-07T09:54:00+0530 Deepak Sreedhar Kanakandath deepaksreedhar.k@tcs.com Sankha Subhra Jana sankha.jana@gm.com Arunkumar Ramakrishnan arunkumar.r@gm.com <p>Structural response of battery packs in electric vehicles when subjected to road loads is an important factor that decides its performance and life during normal operation. In this paper a kriging response surface model is built using a Design of Experiment (DOE) run dataset to predict structural response and global modal frequency metrics of the battery pack. Using this Response Surface Model (RSM), we can rapidly optimize the battery pack design with respect to structural response and achieve significant mass reduction. This method reduces turnaround times for design optimization in early stages of battery pack design.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/115 Comparison of Numerical Methods for Thermal Performance Evaluation of Circuit Protection Devices in EV Application 2022-04-07T10:20:58+0530 Avadhoot Kittur AvadhootKittur@Eaton.com Dikhsita Choudhary DikhsitaChoudhary@eaton.com Dr. Robert Michael Slepian ShivayogiSSalutagi@Eaton.com <p>With the growing demand of electric vehicles, design of circuit protection devices is now an important consideration in automobile industry. Modern day circuit protection devices have been constantly undergoing miniaturization due to requirement of minimizing the foot print for use in electrical vehicles and aerospace applications. This size reduction makes thermal management one of the most important aspects of their design. Use of numerical model to predict heat transfer can significantly reduce the cost and time required in testing physical prototypes. In this paper, three different approaches for numerically predicting temperature rise of circuit breakers are discussed and compared from the point of view of accuracy and computational effort. The three methods are 1) Finite volume based analysis in which conjugate heat transfer inside and outside the breaker is modelled by solving Navier-Stokes equations 2) Finite element based heat conduction model in which convection is modelled as boundary condition instead of solving for fluid motion, and 3) Thermal network based model which uses electrical analogy of heat transfer to solve a thermal resistance network. In the first two iterative models mentioned above, heat generation from current-carrying parts is calculated by solving Maxwell’s equations of electromagnetics by Finite element method. Eddy current losses and temperature dependence of electrical conductivity is considered in the calculation of heat loss. In all three methods, electrical and thermal contact resistances are added at appropriate locations based on analytical calculations. All three methods have been validated with temperature rise test results. In this paper, the heat loss and temperature of a molded case circuit breaker have been predicted by all three methods discussed above. It is observed that the Finite volume-based method is the most accurate amongst the three methods. It can computationally predict air motion and air temperature at critical locations. However, this additional accuracy comes at the cost of added effort in terms of additional mesh count and computation. The Finite elementbased method gives good accuracy but does not predict air temperature. The analytical network-based model is less accurate compared to other methods and relies on product expertise and experience. Based on the study, the following recommendations are made:<br>1) The finite element-based method is best suited to evaluate designs which do not alter flow pattern significantly <br>2) The finite volume method is recommended to evaluate effect of flow altering design changes <br>3) The network-based model is recommended for initial evaluation of correct cross sections of current carrying members.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/116 Lithium-Ion Battery Technologies for Electric Mobility – State-of-the-Art Scenario 2022-04-07T10:29:06+0530 Nagmani nagmani@iitkgp.ac.in Debanjana Pahari nagmani@iitkgp.ac.in Ashwani Tyagi nagmani@iitkgp.ac.in Dr. Sreeraj Puravankara sreeraj@iitkgp.ac.in <p>Rechargeable batteries are an integral part of all types of electric vehicles (EVs). Batteries must contain higher energy-power densities and longer cycle life for an EV system. Lead-acid batteries, Nickel-metal hydride batteries, and Lithium-ion batteries (LIBs) have been employed as charge storage in EV systems to date. Lead-acid batteries and Nickel-metal hydride batteries were deployed in EVs by General Motors in 1996. However, the low specific energy in Lead-acid batteries (34 Whkg-1) and high self-discharge (12.5% per day at r.t.) in Nickel-metal hydride batteries have marked these batteries obsolete in EV applications. LIBs currently occupy most of the EV market because of their high specific power (~130-220 Whkg-1) and a low selfdischarge rate (~5% per month). The current technological maturity and mass production in LIBs have reduced the overall battery cost by ~98% in the last three decades, reaching an average value of $140 kWh-1 in 2021. Although a game-changer in battery technologies, LIBs encounter various challenges: high cost, low safety, less reliability, and immature infrastructure despite environmental benignness. Overcharging and overheating of LIBs can cause thermal runway leading to fire hazards or explosion. Declining Liresources also raise concerns regarding the reliability and shelf-life of LIB technology. Hence, a critical assessment of Li-ion chemistries is essential to comprehend the potential of LIBs in electric mobilities and to realize the prospects in EVs.</p> 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology https://araijournal.com/index.php/arai/article/view/125 Foreward & Message 2022-05-13T12:13:13+0530 Dr. Anuradda Ganesh madhavrao.lib@araiindia.com 2022-05-13T00:00:00+0530 Copyright (c) 2022 ARAI Journal of Mobility Technology