Novel designs, new modelling techniques and the benefits of a full systems approach to be presented
Leamington Spa, UK, 24th November 2017 – Drive System Design (DSD) will present three technical papers at the 16th International CTI Symposium, held in Berlin from 5-6 December. The papers reflect the cutting-edge developments made by DSD as it supports vehicle OEMs and Tier One suppliers in its goal to extend the range of electric vehicles (EVs).
Matthew Hole, Head of Design Engineering, will present ‘Low cost, low drag passive lubrication system developed with smoothed particle hydrodynamics’ at 15:00 on day one. This paper describes how Drive System Design has developed and refined existing Smoothed Particle Hydrodynamic (SPH) techniques to achieve an accurate predictive tool for fluid losses in the transmission. In utilising and developing the technique to predict fluid movement and drag levels, the efficiency of a transmission or axle can be improved by implementing a low cost, low drag passive lubrication system. This paper presents details of the lubrication system, its benefits over existing solutions, and details of the new modelling method and its correlation against test data for validation.
George Scott, Chief Engineer – Analysis, will present ‘Ultra-lightweight design of a single speed EV transmission’ at 15:30 on day one. Scott will outline design opportunities and technologies that resulted in the 27% mass reduction of an already optimised transmission. By utilising a full system analysis model throughout the design process, technologies such as high strength steels and composite casing materials can be exploited to reduce mass whilst maintaining durability, efficiency and NVH performance, in a cost-effective manner. The paper highlights a number of opportunities to improve the range and performance of an electric vehicle, and presents what is possible for a single speed EV transmission. Scott’s conclusion outlines the trade-off between NVH, efficiency and durability and their effect on the overall powertrain mass and cost.
David Yates, Senior Engineer, will present ‘Quiet, efficient and power dense traction epicyclic transmission for high speed motors in EVs’ at 15:00 on day two. As part of the EV Concepts stream, the presentation investigates the feasibility of implementing a traction epicyclic transmission with a view to improving the power density of electric motors designed to run at the increasingly high speeds that automotive applications demand. The paper features a concept for a low power transmission, suitable for A-segment EV applications with a 25,000rpm input machine. Yates presents the challenges involved with the transmission design, and compares the NVH, durability and efficiency to a baseline model of a typical two-stage epicyclic arrangement.
Further details of the DSD presentations, including session details, are available on the Symposium website:
Drive System Design (DSD) is an award winning engineering consultancy specialising in the engineering, development, test and control of transmission and future driveline systems. Celebrating its tenth year of business in 2017, the company’s staff have experience working with vehicle manufacturers and Tier 1s around the world, designing new technologies and solving problems to make their products more competitive. They have the engineering, test, analysis and project management skills necessary to deliver projects to demanding timescales. Working closely with its customers through technical centres in Europe and North America, DSD is recognised as a world leading expert in driveline refinement, efficiency improvement and hybrid and electric vehicle transmissions. DSD is ISO 9001 and ISO 14001 certified.
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