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Damage Matching Criterion for Development of Accelerated Duty Cycle from Road Load Data, and Achieving Right Duty Cycle to Determine Gear and Bearing Durability

Romax Solutions-Amol Korde
  • Technical Paper
  • 2019-28-0121
To be published on 2019-10-11 by SAE International in United States
While designing the transmission, designer needs to have a duty cycle which is a set of load cases against which he wants to confirm the durability of the same. This is done through data acquisition by running a vehicle on various terrains and converting those data points to a concise set of load cases which we term as duty cycle. This concise set of load cases required because data acquired has millions of data points giving value of torque and RPM at every millisecond which cannot be directly used to assess the fatigue durability of gears and bearings. Converting these millions of road load data points into fewer number of load cases is always a challenge. For a transmission designer, it is being a major hurdle to determine as what is the scientific way of converting these millions of data points into a concise duty cycle. The road load data is taken for few hundred or few thousand kilometres covering enough types of terrains on which vehicle is expected to run. The methods available with…
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Driveline Noise Reduction by Predicting Mesh Transmission Error and Micro Geometry Optimization

Romax Solutions Pvt. Ltd., India-Amol Korde, Vijay Mahendraker
Published 2009-01-21 by The Automotive Research Association of India in India
Mesh transmission error is one of the major causes of noise of drive train which gets transmitted to inside the vehicle cabin. Apparently, one way to reduce the driveline noise is tackle the noise excitation mechanism at its source. This excitation can be reduced by optimizing the gear teeth micro geometry for minimum Transmission Error (TE). The mesh misalignment and the resultant transmission errors can be analyzed and predicted at the transmission design stage. The entire exercise includes detail design of gear box, testing and validation, model updating to match the test result and micro geometry optimization as a design change for noise reduction, prior to productionThe process of micro geometry optimization provides multiple options of lead and profile corrections with specific response level. The designer then has the choice of solutions for selecting the gear teeth micro geometry based on manufacturing feasibility and achieve TE within acceptable range.
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