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Development of a Graphical User Interface (GUI) Based Tool for Vehicle Dynamics Evaluation

Mahindra & Mahindra Ltd-Saravanan Muthiah
Mahindra & Mahindra, Ltd.-Divyanshu Joshi
  • Technical Paper
  • 2019-28-2397
To be published on 2019-11-21 by SAE International in United States
Title Development of a Graphical User Interface (GUI) Based Tool for Vehicle Dynamics Evaluation Authors Mr. Shubham Kedia, Dr. Divyanshu Joshi, Dr. Muthiah Saravanan Mahindra Research Valley, Mahindra & Mahindra, Chennai Objective Objective metrics for evaluation of major vehicle dynamics performance attributes i.e. ride, handling and steering are required to compare, validate and optimize dynamic behavior of vehicles. Some of these objective metrics are recommended and defined by ISO and SAE, which involve data processing, statistical analysis and complex mathematical operations on acquired data, through simulations or experimental testing. Due to the complexity of operations and volume of data, evaluation is often time consuming and tedious. Process automation using existing tools such as MS Excel, nCode, Siemens LMS, etc. includes several limitations and challenges, which make it cumbersome to implement. In the current work, a GUI based post-processing tool is developed for automated evaluation of ride, handling and steering performance. Methodology This work is about development of a centralized platform for quantification, visualization and comparison of ride, handling and steering performance metrics from testing and…
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Experimental Investigation on the Effect of Tire Pressure on Ride Dynamics of a Passenger Car

Mahindra & Mahindra Ltd.-Saravanan Muthiah
Mahindra Research Valley-Divyanshu Joshi
Published 2019-04-02 by SAE International in United States
Ride is essentially the outcome of coupled dynamics of various involved sub-systems which make it too complex to deal analytically. Tires, amongst these, are known to be highly nonlinear compliant systems. Selection of tires specifications such as rated tyre pressure, etc. are generally decided through subjective assessment. While experts agree that tyre pressure affects the attributes such as ride to a noticeable degree, the quantification of the change often remains missing. In the current work, vibration levels of various sub-systems relevant to ride in an SUV are measured for three different tyre pressures at different speeds over the three randomly generated roads. For the purpose, artificial road profiles of classes A, B and C are synthesized from the spectrum of road classes defined in ISO 8608:2016 and reproduced on a four-poster test rig. Various ride performance metrics such as weighted root mean square (RMS) acceleration, primary ride, secondary ride, frequency responses etc. are measured and compared across the tyre pressures (29, 32 and 35 PSI) on an SUV vehicle. Key findings include a trend of…
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A Study on the Repeatability of Vehicle Ride Performance Measurements

Mahindra & Mahindra Ltd-Saravanan Muthiah
Mahindra Research Valley-Divyanshu Joshi, Shubham Kedia
Published 2019-01-09 by SAE International in United States
Across the automotive industries, objective measurements and subjective assessment of vehicle ride performance are routinely carried out during development as well as validation phase. Objective measurements are receiving increased attention as they are generally believed to offer a higher degree of objectivity and repeatability compared to the subjective assessment alone. Typical industry practices include the acquisition of vehicle-occupant vibrational response on specified road sections, test surfaces on proving grounds or in a controlled input environment such as four-poster test rig. In presented work, a study is performed on the repeatability of vehicle ride performance metrics such as weighted RMS acceleration and frequency responses using the data acquired in repeated trials conducted using three different sports utility vehicles (SUVs) on a sufficiently long designated road section. Intra-vehicle and inter-vehicle ride performances are compared and studied against the mentioned metrics. Results indicate a significant variability of results in repeated trials, which in few cases is found to exceed the variation across the vehicles. These variabilities can be arguably attributed to several inevitable practical constraints such as vehicle…
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A Study on the Effect of Steering Input Frequency on Transient Lateral Dynamics of Four-Wheeled Passenger Vehicles

Mahindra & Mahindra Ltd-Saravanan Muthiah
Mahindra Research Valley-Divyanshu Joshi, Shubham Kedia
Published 2019-01-09 by SAE International in United States
Vehicle lateral dynamic response parameters such as yaw velocity, lateral acceleration, roll angle, etc. depend on the nature of steering input. Response parameters vary with the amplitude and frequency of steering input. This paper deals with developing insights into the effect of steering input frequency on transient handling dynamics. For the purpose two SUV segment vehicles with similar curb weight are considered. Vehicles are given pulse inputs of the amplitudes corresponding to 4 m/s2 steady state lateral acceleration and target speeds of 80 kmph and 100 kmph, as recommended in ISO 7401:2011. Steering inputs are executed using a Steering Robot (ABD SR30). Lateral transient dynamic response gains as well as natural frequencies of yaw are studied for 0-2 Hz input frequencies. Several insights are developed, adding to the understanding of transient lateral dynamics and its relationship with steering input.
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Estimation of Clutch Life for Manual Transmission Vehicle Through Thermal Modeling of Clutch Housing and Clutch Facing

Mahindra & Mahindra, Ltd.-Srinivasan Paulraj, Saravanan Muthiah
Published 2017-10-08 by SAE International in United States
Poor clutch life is a major issue for some light commercial vehicle models. Clutch overheating is the primary cause for clutch failure. Some of the reasons include inappropriate gear selection by the driver, poor low-end dynamic torque availability from an engine, heavy stop and go traffic, vehicle overloading resulting in excessive clutch slippage especially in gradients, riding of the clutch pedal by the customer etc. These situations lead to a high thermal energy dissipation at the clutch, increasing clutch wear and in extreme conditions leading to not only poor shift quality but also eventual clutch failure. Unfortunately, it is not practical to monitor clutch temperature in a production vehicle due to high costs or technical challenges involved.This paper describes 1-D thermal modeling of single plate dry clutch typically used in passenger car/truck and bus applications. The objective of simulation is to estimate the temperature rise on the clutch facing and clutch housing. This can be used in conjunction with supplier provided data (facing temperature vs facing wear ratio) for different clutch materials to estimate clutch…
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Driveline Ratio Selection and Shift Map Optimization for Automatic Transmission Vehicle at Concept Phase through Simulations

SAE International Journal of Passenger Cars - Mechanical Systems

Mahindra & Mahindra, Ltd.-Srinivasan Paulraj, Saravanan Muthiah
  • Journal Article
  • 06-11-01-0005
Published 2017-10-08 by SAE International in United States
Traditionally driveline ratios are selected based on trial and error method of proto vehicle testing. This consumes lot of time and increases overall vehicle development effort. Over last few decades, simulation-based design approach has been extensively used to alleviate this problem. This paper describes torque converter and final drive ratio (FDR) selection at concept phase for new Automatic Transmission (AT) vehicle development. Most of the critical data required for simulating vehicle performance and fuel economy (FE) targets were not available (e.g. shift map, clutch slip map, pedal map, dynamic torque, coast down, etc.) at an initial stage of the project. Hence, the risk for assuming right inputs and properly selecting FDR/Torque converter was particularly high. Therefore, a validated AVL Cruise simulation model based on an existing AT vehicle was used as a base for new AT vehicle development to mitigate the risk due to non-availability of inputs. The simulation model shows 97% correlation with the test results by using base shift map. The shift map was further optimized by using Gear Shifting Program (GSP) and…
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Optimization of Tip-In Response Character of Sports Utility Vehicle and Verification with Objective Methodology

Mahindra & Mahindra, Ltd.-Harinarayanan Jayaraman, Navaneetha Rao, Saravanan Muthiah, Sreeekanth Mohan
Published 2015-04-14 by SAE International in United States
Each OEM has a distinguishing drivability character that defines its image in the market to achieve brand differentiation. Drivability is one of the important factors along with fuel economy that determines the success of a vehicle vis-à-vis its competitors. It can be said that the need for good drivability among customers is increasing day by day similar to the need for high fuel economy.Drivability is the response that a vehicle delivers to the inputs of the driver which are mainly accelerator, brake, clutch, gear and steering. The dynamic response of the vehicle is mainly in terms of velocity and acceleration. The way the response is delivered will characterize the drivability of a vehicle.The drivability event discussed in this paper is throttle tip-in response which is one of the critical evaluation factors for defining the character of a Sports Utility Vehicle. Objective methodology tool AVL Drive is used for the study since it can evaluate on an extensive basis as well as provide micro level analysis.Longitudinal acceleration is measured using an accelerometer and other parameters like…
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Investigation on the Effect of Coolant Temperature on the Performance and Emissions of Naturally Aspirated Gasoline Engine

Maruti Suzuki India Ltd.-Santhosh Thomas, Agam Saroop, Ranjeet Rajak, Saravanan Muthiah
Published 2011-01-19 by The Automotive Research Association of India in India
Downsizing of engines is becoming more popular as manufacturers toil for increased fuel economy. Due to the downsizing of engines, Brake Mean Effective Pressure (BMEP) tends to increase, which in turn increases the heat release from engine. This necessitates the need for optimizing cooling system in order to get higher engine output and lower emissions to comply with stringent emission norms. In earlier engines, thermo-siphon principle was used with water as the coolant. This has been replaced in modern engines with pressurized cooling system with coolants like ethylene glycol mix. Along with the conventional objective of increased material durability with the optimized engine cooling system, it has been found that there is an improvement in the engine output due to increased charging efficiency. This paper describes the effect of engine coolant temperature on performance, emission and efficiency of a three-cylinder naturally aspirated spark ignited engine. The engine was tested at different coolant temperatures and performance and emissions were measured. The effect of coolant temperature on the full-load motoring torque was measured so as to investigate…
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