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Gosavi, Santosh
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Virtual Road Torque Data Collection

Tata Motors Ltd.-Dattatreyudu Mullapudi, Popat Rajput, Mithun Chaskar, Santosh Gosavi
Published 2019-01-09 by SAE International in United States
The traditional method of collecting the Road Torque Data of a vehicle is by instrumenting and running the vehicle on different road terrains. Every time, physical testing becomes tedious & most challenging task due to unavailability of unit under tests, kind of resource required and so on. However, in view of response to the fast emerging technology & limit less competition, it has become mandatory to develop & launch products in market within no time. In recent times, there is increased demand for physical road torque data measurements for a vehicle program based on its application and different powertrain configurations, which clearly shows that unless we front load the data to design it is practically impossible to meet the deadlines. Each of these measurements cost and consumes valuable resources of the company in collecting and analyzing the data. These challenges triggered us to develop a methodology, which will give us quick estimate of the required parameters from road torque data measurements in the absence of physical prototype. The developed methodology will reduce the time required…
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Seat Structure Comfort Evaluation Using Pink Noise and Human/Dummy Transmissibility Correlation

Tata Motors, Ltd.-Sivapriya Balasubramanian, Santosh Gosavi
Published 2013-11-27 by SAE International in United States
Vehicle floor vibration is the resultant of different road inputs damped through various transfer paths. Seat comfort, which depends on these floor vibrations, can be evaluated with a single input signal “Pink noise”; which constitutes various road inputs. Transmissibility of seat structure on a vibration shaker with pink noise input includes all possible responses of road inputs.Still, transmissibility profile at vehicle end and component level varies. This is due to the utilization of “dummy” on component level testing on vibration shaker, which acts as a dead weight with dissimilar damping characteristics of human. A transmissibility correlation between human and dummy is attained by replacing the dummy in place of human and actuating it to find the difference in contribution between them for different class of vehicles. This contribution extrapolation from the damping effects of human and dummy is applied on dummy transmissibility. This results in a complete solution for attaining real time vehicle level seat structure transmissibility at component level testing.
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