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Viewing 1 to 30 of 29517
2015-01-14
Technical Paper
2015-26-0017
Ravindra Shah, Swapnil Ghugal, Ujjwala Shailesh Karle, Anand A Deshpande
In Control algorithm development for typical Engine Management System, various challenges is being faced. To develop a reliable control algorithm, proper environment of testing it in closed loop is required. In such development activity, it is very important to validate the algorithm on the target engine standalone. This can be achieved in engine test cell where the actual engine will be controlled by prototype ECU. But this process has drawbacks like higher testing cost, time consuming, non-reusability of test bed etc. Simulation based plant model development for closed loop ECU testing is an effective technique for such application. Various generic engine models are available for such application, but to suit particular vehicle, this model need to be parameterized. Typically in Indian conditions, variety in engines can be observed in terms of engine capacity, number of cylinder, sensor used etc.
2015-01-14
Technical Paper
2015-26-0010
Avinash Rajendran Vallur, Yuvaraj Khairate, Chandrakant Awate
In a bid to improve performance and fuel economy keeping in accordance with various regulatory requirements, OEMs across the globe have looked towards hybridization and electrification of vehicles. The increased vigor and enthusiasm shown by auto makers have given rise to numerous electric-hybrid vehicles that have been successfully introduced into the consumer market. Full Hybridization of vehicles often entails the use high performance motors and large battery packs. A viable alternative seems to be the use of low voltage systems, these systems are not capable of running the vehicle totally independent of the engine but only assist the engine through torque boost during periods of high torque demands and regenerative braking to effectively utilize available kinetic energy.
2015-01-14
Technical Paper
2015-26-0013
Ashwini S. Athreya, Sreenath K R, Deepak Sharma
In the era where governmental agencies are perennially pushing automobile OEMs for reducing harmful emissions and customers looking for vehicles with better fuel economy values, it is imperative on the manufacturers to implement/add new technologies to appease them. Of the many new technologies, the most promising ones are the new control strategies/algorithms which predictively access the road condition, weather, traffic situations and help automobile to function in the most efficient mode. These control strategies/algorithms are termed as “Predictive technologies”. The most common way to assess the benefit of such new technologies is to simulate the vehicle behaviour in conjunction with the existing complex control strategies of Hybrid vehicles, in the simulation environment.
2015-01-14
Technical Paper
2015-26-0011
Ilango Panneerselvan, Suresh Arikapudi, Smitan Brahmbhatt, Tanushree Madhugiri, Om Prakash
A complex system like a hybrid electric powertrain requires analysis of all its subsystems to optimally utilize, size components, for performance evaluation and control strategy development. A high fidelity model of those subsystems integrated together can greatly reduce the development cost, time and risks in deviation from the targeted performance, giving a chance for early redefinition of the system. A high fidelity model of a sedan car was developed featuring chassis with longitudinal and lateral dynamics, Suspension with joints & bushes with stiffness, tires calculating longitudinal & lateral forces during vehicle motion, Engine model with combustion & Dynamics of reciprocating and rotating components, Electric motors, Battery system, and gearbox with synchronizers and friction components. Powertrain components were interconnected using 3D rotational flanges.
2015-01-14
Technical Paper
2015-26-0037
Kartik Kulkarni, Ayush Sood
The heat losses through exhaust gases and the engine coolant contribute significantly towards reduction in thermal efficiency of an Internal Combustion (IC) engine. This largely impacts the fuel economy and power output. Waste Heat Recovery (WHR) has proven to be an effective method of overcoming these challenges. A Rankine cycle is a reverse refrigeration cycle that circulates a working fluid through the four basic components namely the pump, evaporator, turbine and condenser. It is a popular WHR approach in automotive applications with varying levels of success in the past. As the heat transfer capability in organic working fluids is greater than the conventionally used inorganic fluids, the former is used to capture maximum waste heat from low grade heat sources such as the automobile engine. A dual-loop Organic Rankine Cycle (ORC) is proposed for a heavy duty IC Engine with working fluids R245fa and R236fa for the High Temperature (HT) and Low Temperature (LT) loops respectively.
2015-01-14
Technical Paper
2015-26-0034
Tushar Kanikdale, Shankar Venugopal
We present a framework for creating and analyzing future scenarios that are relevant to automotive engines in India. We propose an approach to enable us to continuously capture the diverse inputs from an ever changing external environment and be agile in responding to the changes. We have illustrated the application of future scenarios building process to IC engines used in commercial vehicles. We have designed a critical technologies / parameters dashboard for the commercial vehicle industry to continuously monitor the evolution of the scenarios. The critical parameters are assigned current and future probabilities to visualize plausible alternative futures.
2015-01-14
Technical Paper
2015-26-0226
Bhaskarjyoti Saikia, Piyush Ranjan, Vasundhara Arde, Remesan Chirakkal
The application of virtual simulation of Engine components has become an integral part of design and development process. Virtual simulation offers opportunities to reduce number of physical testsduring design verification and validation and thereby helps in achieving considerable reduction in development time and cost. This paper explains a case study that was essential for assessment of strength & fatigue analysis of diesel engine connecting rod as part of an engine development program for power upgrade through Turbo charging. The methodology adopted simulates major loading conditions for Compressive& Tensile stress &fatigue life of connecting rod. Finite element analysis was done to calculate static displacement, strain and stresses under maximum compressive and tensile loading which were then used for critical point evaluation.
2015-01-14
Technical Paper
2015-26-0236
Zhiteng Zhou, Yaohua He, Dong Wang
  In order to satisfy the requirements of wireless communication in online automatic testing system for vehicle driving wandering, this essay discusses the application of persistent connection strategy in testing system. Through the experimental analysis of delay problem of communication strategy, it draws the timeline from the perspective of transport layer in TCP/IP protocol, and proposes the spit connection strategy. Based the Markov Chain of the two strategies, it deeply analyzes the instantaneity of dynamic communication in different electromagnetic environments from the perspective of state transition. Split connection, which meets the need of engineering test, is proved to have higher instantaneity and efficiency after numerous field tests under complicated electromagnetic interference environment.
2015-01-14
Technical Paper
2015-26-0214
Sivanandi Rajadurai, Guru Prasad Mani, Kavin Raja, Sundaravadivelu M, Balaji Manivannan
In an automotive, exhaust system components are stripped to many types of vibrations from simple sinusoidal to maximum random excitations. Hot Vibration shakers plays a crucial role in durability testing of these components. This is due to minimum development time, number of available prototypes, also value of the money. In design and validation of vibration assembly, CAE simulation plays a inevitable role due to its virtual verification also it provides the optimized solution rather than "over engineering" . Hot vibration test is an accelerated key life test required to establish durability life in field. Key life test conditions are chosen in such a way that "those parts which passes key life test will always pass in the field" and "those parts which fail key life test need not necessarily fail in the field". During test, it is more critical to understand the effects of the test component as well as the total assembly and environment.
2015-01-14
Technical Paper
2015-26-0213
Christoph Poetsch, Peter Priesching, Henrik Schuemie, Reinhard Tatschl
The operation of spark-ignition engines (SI-engines) is characterized by a non-repeatability of the instantaneous combustion rate of the individual engine cycles at nominally identical engine operating parameters, commonly referred to as cyclic combustion variability (CCV). CCV are responsible for the engine knock behavior and the related engine performance and fuel consumption. In the present work, a scalable simulation methodology is presented that enables the analysis of CCV and their impact on engine efficiency and fuel consumption on component, sub-system and system level. On the component level, a 3D-CFD Large-Eddy-Simulation (LES) approach is used for the calculation of multiple engine cycles in order to analyze the impact of the flow field and mixture formation on the cycle-resolved flame propagation and hence on the cycle-to-cycle combustion variations.
2015-01-14
Technical Paper
2015-26-0215
T Sukumar, Murugan Subramanian, Sathish Kumar Subramaniyan, Nandakumar Subramanian
In commercial vehicle air brake system, the Spring Brake Actuator (SBA) is used for braking application. The device has two types of chambers. 1. Spring chamber for parking brake application 2.Service chamber for normal brake application. In the spring chamber a lip seal is used for seal the air from the spring chamber to atmosphere. When the vehicle is normal running condition the parking brake is in released condition due to the air pressure load. If there is any leak from the spring chamber through the lip seal, the parking brake will apply automatically by the spring force during the vehicle running condition. This will leads to sudden vehicle stop, skidding and possibility for accident. Since the lip seal is a critical component in the air braking system, the design and optimization of the seal profile is required. The lip seal is made up of Neoprene rubber (NBR), a Mooney-Rivlin hyperelastic material model is used to simulate the sealing mechanism.
2015-01-14
Technical Paper
2015-26-0206
Nikhil Mule, Dattatraya Pilane, Prashant Mahale, M P Raajha
Brake is a critical safety aspect of an automobile and hence its failsafe design is of prime importance. Modern vehicles, especially cars and SUVs, with high speed as well as acceleration capacity demand the braking system also to be equally robust and stable in all critical operating conditions. Typically, during braking front brakes are has to more work done than rear and these are as disc brakes using cast iron rotors. Rotors absorb the heat energy of braking kinematic and dissipate it into air. With stringent multifaceted requirements of reduction in weight of vehicle and cost, rotors are reasonably optimized wrt these parameters. On contrary, this could limit thermal absorption capacity of rotor i.e. heat dissipation, which in turn can affect the brake performance and wear characteristics of friction pair. Also, a rotor designed too weak wrt thermal aspects can succumb to heat deformations and may crack in extreme conditions.
2015-01-14
Technical Paper
2015-26-0205
N. Prabhakar, Suresh Gayakwad K, P. Lingeswaramurthy, P.S. Lakshman
The present investigation deals with the design and shape optimization of the steel insert used in the hand brake valve to withstand the impact load during brake off condition. This hand brake valve is used in the vehicles for parking brake application. It consists of a steel insert with a helical coil spring for locking and unlocking of a lever during brake on and off condition. Also a torsion spring with a cam mechanism is used for opening and closing of a hand brake valve. When the lever is locked the flexible elastic object (torsion spring) stores the mechanical energy when it is twisted. When it is unlocked (braking off) it exerts a force (actually torque) in the opposite direction, proportional to the angle it is twisted. During the braking off condition the steel insert gains the angular velocity from the stored mechanical energy of the torsion spring.
2015-01-14
Technical Paper
2015-26-0208
Xiongwen Lu
The main purpose of this paper is to research the aerodynamic characteristics of the Formula SAE car. A more accurate CAD model is built to reduce the impact of oversimplification. Computational Fluid Dynamics (CFD) method is adapted. The computational domain is meshed with tetrahedral and polyhedral cells and the flow field is predicted using the Realizable k - ε turbulence model. Data obtained in this study include the aerodynamic drag and lift coefficients, pressure distribution on external surfaces and velocity distribution at different cross sections. The pressure distribution is investigated in a quantitative manner. An in-depth study is undertaken to analyze the turbulence structure in the wake. The research indicates that the front and rear wings have a notable impact on the external aerodynamics of the car. Furthermore, several suggestions are put forward to make the Formula SAE car achieve higher levels of performance.
2015-01-14
Technical Paper
2015-26-0207
Kamran Hashmi, D Radhakrishna
Abstract This paper deals with the application of 1-D simulation technique for prediction of engine performance at high altitudes. 1-Dimensional (1-D) engine simulation is an important tool for engine development activities. Engine design through simulation can substantially cut down time needed to execute experiments and prototyping, as todays softwares can simulate most of the experiments.This approach was applied for simulation of a spark-ignited engine for Unmanned Aerial Vehicle (UAV).A detailed 1-D thermodynamic model was prepared for the engine configuration in Ricardo WAVE environment; different simulation runs were executed and then performance parameters like brake power, torque, specific fuel consumption, BMEP, in-cylinder pressure etc were predicted. A predicted performance shall always be co-related with test results for correct interpretation.
2015-01-14
Technical Paper
2015-26-0210
Nilesh Daithankar, Kishor D Udawant, Nagesh Voderahobli Karanth
This paper presents a methodology for predicting thermal comfort inside midibus cabin with an objective to modify the HVAC duct design and parametric optimization in order to have improved thermal comfort of occupant. For this purpose the bus cavity is extracted from baseline CAD model including fully seated manikins with various seating positions. Solar Load has been considered in the computational model and passenger heat load is considered as per BSR/ASHRAE 55-1992R standard. CFD simulation predicted the air temperature and velocity distribution inside passenger cabin of the baseline model. The experimental measurements have been carried out as per the guidelines set in APTA-BT-RP-003-07 standard. The results obtained from CFD and Experimental test were analysed as per EVS EN ISO7730 standard and calculated occupant comfort in terms of thermal comfort parameters like Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD).
2015-01-14
Technical Paper
2015-26-0212
Neerav Karani, Aditya Malladi, Sridhar lingan Sr
In the current competitive automobile market, with growing knowledge and concern for occupant and vulnerable road user safety, design & engineering of passenger cars in stipulated time is a challenge. As front styling is a crucial factor, early involvement of CAE through front loading helps reduce the product development time considerably with a pedestrian friendly engineered design. The present paper explains how initial inputs are given to styling & engineering teams during early stages of product development where availability of CAD data is minimal. Critical load paths were identified and shape of the front end was modified accordingly. Various locations of hinge mechanism were evaluated to reduce the severity of injury in the head impact zone. Sufficient gaps between the exterior surfaces and interior hard points were worked upon to reduce the impact values. Lower & upper energy absorbers for leg impact were proposed and tuned to meet the injury criteria.
2015-01-14
Technical Paper
2015-26-0211
Parandhamaiah Gorre, Pln Prasad, Mansinh Kumbhar, Gajanan Kale, Vamsi Pathapadu
Electric cars are the future of urban mobility which have very less carbon foot print. Unlike the conventional cars which uses BIW (Body in White), some of the electric cars are made with a space frame architecture, which is light weight and suitable for low volume production. In this architecture, underbody consists of frames, battery pack, electronics housing and electric motor. Under body drag increases due to air entrapment around these components. Aerodynamic study for baseline model using CFD simulations showed that there was a considerable air resistance due to underbody components. To reduce the underbody drag, different add-ons are used and their effect on drag is studied. A front spoiler (air dam) is used to deflect the incoming air towards sides of the car. A front bumper cover for front components, trailing arm cover for trailing arm and rear bumper cover for rear components were used to reduce underbody drag.
2015-01-14
Technical Paper
2015-26-0197
Ashit Kumar, Amarjeet Singh, Felix Regin A
Reducing the carbon footprint by meeting stringent emission regulations and improving the fuel efficiency has become an essential feature in 21st century product design cycle for automobiles. Vehicle aerodynamic has become increasingly important every year. Vehicle weight is reducing progressively every year and the interaction between the aerodynamic forces and vehicle body is becoming more complex and important. Ground clearance affects the lift and drag forces considerably. Lift affects the vehicle stability and is important for safety while Drag force directly affects the fuel economy of the vehicle. Various drag reduction devices such as air dam, rim cover, spoiler and undercover etc. are added to reduce the drag. Vehicle aerodynamic drag is affected by a number of parameters like –exterior geometry, grill open area, layout of underbody parts, tire specification and suspension layout.
2015-01-14
Technical Paper
2015-26-0203
Nikhil V. Mahajan, Shriniwas Chippa P, Abhijit Majage S
Static & Dynamic Analysis of Body Control Module N. V. Mahajan1, S. P.Chippa1*, A. S. Majage2 1Department of Mechanical Engineering, Vishwakarma Institute of Technology, pune 2Finite Four Technologies, pune *Correspondence author : chippashriniwas@gmail.com Abstract Nowadays, the passenger cars are employing more and more electronic devices for controlling various mechanisms. This has increased the demand for such equipments in the passenger car. The electronic devices for controlling the mechanisms such as keyless entry, window, wiper controllers, mirror controls, engine performance monitors, security systems, lighting control are mounted on Printed Circuit board (PCB) which is enclosed inside the plastic cover assembly called Body Control Module (BCM). The Body control module is attached inside the dashboard assembly which is subjected to various loading conditions. In addition, space and height constraints should also be taken into consideration.
2015-01-14
Technical Paper
2015-26-0204
Satyajeet Kulkarni, Abhijit Kumbhar, Jagannath M Paranjpe, Nagesh Voderahobli Karanth
To achieve first time right in any new part development process requires number of trials,skilled manpower, huge cost and massive time. In case of forging process,to develop new component lot of physical trialsrequired to be conducted due to process variations.Need of hour is shorter development time with highest quality.All these requirements can be achieved with the help of reliable computer simulation. With computer simulation, process can be optimized, crack analysis can be carried out, Additionally use of computer simulation in forging process reduces no. of trials, ultimately saves time, energy and product cost. The paper deals with forging process optimization by effective use of computer simulation. Existing forging process and modified forging process wassimulated. Forging process was able to simulate crack generation due to improper metal flow as observed in existing forging simulation process, and good co-relation was established.
2015-01-14
Technical Paper
2015-26-0201
Chandrasekhar Kodela, Michael Kraetschmer, Santosh Basa
Demand for fuel efficient vehicles in the automotive industry is increasing day by day. Fuel economy is one of the factors that drives the automobile sector today. Power loss in the vehicle driveline directly affects the fuel economy and need to be reduced to achieve the best fuel economy. To reduce the power loss we need to estimate the power loss in the driveline and the causes of that power loss. One such attempt is made here to estimate the oil splash losses in a manual transmission gear box using CFD. Commercial code ANSYSFLUENT is used for this purpose. Manual transmission (MT) gear box contains several gear pairs and generally uses splash lubrication to lubricate the bearings and synchronizers. Because of the splash lubrication, MT-Gear Box has some power loss due to churning and squeezing of surrounding fluid by the gears. This is also called splash power loss.
2015-01-14
Technical Paper
2015-26-0202
Mahesh Patwardhan, Jagannath M Paranjpe, Sushil S Ramdasi, Nagesh Voderahobli Karanth, Neelkanth V Marathe, Prasad Bhat
Use of Non Linear Analysis in Powertrain Design for Prediction of Cylinder Bore Distortion, Design changes for Reduction along with Experimental Validation M.A. Patwardhan, J. M. Paranjpe, S.S. Ramdasi, N.V. Karanth, N.V. Marathe, ARAI Pune Abstract The work presented in this paper deals with the use of non-linear FEA simulation in powertrain development. Prediction of cylinder bore distortion early in the design stage significantly affects overall performance of engine as bore distortion directly affects oil consumption, blowby and emission. The paper presents a methodology for predicting bore distortion with an objective of achieving improved performance of powertrain.
2015-01-14
Technical Paper
2015-26-0188
Prashant Khapane, Uday Ganeshwade, Kevin Carvalho
Vehicle water wading capability refers to vehicle functional part integrity (e.g. engine under-tray, bumper cover, plastic sill cover etc.) when travelling through water. Wade testing involves vehicles being driven through different depths of water at various speeds. The test is repeated and under-body functional parts are inspected afterwards for damage. Lack of CAE capability for wading equates to late detection of failure modes which inevitably leads to expensive design change, and potentially affects program timing. It is thus of paramount importance to have a CAE capability in this area to give design loads to start with. Computational fluid dynamics (CFD) software is used to model a vehicle travelling through water at various speeds. A non-classical CFD approach was deemed necessary to model this. To validate the method, experimental testing with a simplified block was done and then verified with CFD modelling.
2015-01-14
Technical Paper
2015-26-0186
Mohitkumar R. Chauhan, Girish Kotwal, Abhijeet Majge
Numerical Simulation of Tire and Wheel Assembly Impact Test using Finite Element Method M R Chauhan1 Prof. G N Kotwal2 A S Majage3 1,2Department of Mechanical Engineering, VIT, Pune, India 3Finite Four Technologies, Pune, India Abstract: The major concern in design of wheel is their potentiality to bear impact loads. Therefore, wheel impact test is required to fulfill the safety requirement. In this study, there are two objectives; first, the simulation of impact test for wheel is developed according to SAE wheel impact test. Often when vehicle interacts with guardrails, bridge rails and curbs the interaction between roadside hardware and wheel causes wheel damage. The test setup consists of vertically acting striker of mass 480 kg and having prescribed velocity. Energy based approach and total plastic work concept of ductile fracture mechanics is used to predict wheel impact failure.
2015-01-14
Technical Paper
2015-26-0195
Chandran Narasappan, V Sundaram, S. Sathish Kumar
CAC Plumbing lines Inner medium pressure drop 1D model Optimization Chandran N1, Sundaram V2, Sathish Kumar S3 1, 2, 3 Chrysler India Automotive Pvt. Ltd ABSTRACT The Charge air cooler (CAC) is designed to cool the charge air after being boosted by the Turbocharger. The temperature of the charge air becomes high after the compression. In order to maintain the optimum temperature and to further improve the charge air density, allowing more air mass flow to the engine the CAC is used. This makes the combustion more efficient, resulting in better engine performance and fuel economy. The performance of the CAC is highly affected by the plumbing lines which transport the compressed charge air from turbocharger to the intake manifold of the Engine. It consists of metal tube, hose, duct and resonator. Designing the optimum CAC plumbing lines with lesser pressure drop is the major requirement of the CAC system considering the complex packaging.
2015-01-14
Technical Paper
2015-26-0191
Pablo Cruz, Jose Antonio Muñoz, Jordi Viñas
Robust and reliable FE-model spotweld characterization has been a challenge since spotweld technology was incorporated extensively into the automotive industry. The innovation required leads to constant enhancement of product performance; reduced time-to-market, cost and weight. The need for quality requires robust development tools, consistency of design decisions, and repeatability of the development process. Proper spotweld characterization has a clear impact on the abovementioned needs and carmakers invest in efforts to increase the efficiency of the development process. Furthermore, the continuous usage of new steel grades increases the complexity of the topic. This paper presents an in-depth spotweld study that involves three different spotweld specimens: KSII; lap shear and peeling, for three automotive steel grades considering three different thicknesses for each material grade.
2015-01-14
Technical Paper
2015-26-0192
Sourabh Shrivastava, Padmesh mandloi
Simulations can provide comprehensive understanding of process occurring inside an IC engine and its relevant cooling system like engine water jacket etc. Thus it can help in improving the thermal efficiency of the system. This paper describes and validates ANSYS CFD based automated approach that is developed to perform thermal analysis of an IC engines by modeling both, IC engine and its cooling system. Since underline physics of an in-cylinder combustion process and heat transfer through cooling jackets have very different time scales, discussed methodology uses a coupled approach to solve the two problems. This involves running two different CFD simulations, in coupled manner till cyclic-steady state temperature distribution is obtained on the cylinder head, namely : One, as a transient in-cylinder simulation to model combustion in the diesel engine that starts from IVC and ends at EVO.
2015-01-14
Technical Paper
2015-26-0181
Mukund Trikande, Sujithkumar Muralidharan, Vinit Jagirdar
Road disturbances introduce a combination of vertical and angular motions of pitch and roll that affect the stability and ride comfort of a military vehicle. This study focuses on the enhancement of stability and ride comfort. A half car model with 4 Degree of freedom (DOF), whose vehicle chassis can pitch and bounce, is modeled in Simulink with the objective of attitude control using Stability Augmentation System (SAS). Control is implemented at two levels, one at the suspension level which is an open loop control for improving the ride and the other is closed loop for controlling the body motion by sensing pitch and bounce displacement. The inner loop is utilised to reject the effect of road disturbances and outer loop is to stabilize heave and pitch response. In other words, inner loop provides ride control and the outer loop provides the attitude control. The control force is obtained by using an active damper.
2015-01-14
Technical Paper
2015-26-0180
Bhupinder Singh, Vikas Rawla, Rajesh Vats, Arun Kumar
Clutch actuation system in manual transmission is one of the key systems of power-train with which driver interacts frequently. Therefore its load and travel feeling are important to customer. Clutch actuation system consists of clutch pedal assy, flexible cable mounted on body panel, and clutch release arm/shaft assy inside transmission unit assy. Clutch pedal load, travel and engagement point are important parameters to specify the actuation feeling while designing the clutch actuation system. Validation of actual values is being done at vehicle proto testing stage as final output calculation may not be accurate due to dependency on variables difficult to estimate. To overcome these difficulties a virtual dynamic model of the entire clutch actuation mechanism has been created in MBD software. Model input factors are based on actual testing results to improve the accuracy. The model predicts the Clutch pedal load and travel values for a given set of vehicle inputs.
Viewing 1 to 30 of 29517