Kistler Instruments Ltd. - PRODUCT NEWS
Jaguar Land Rover is using the best available technology to generate the real world data for accurate tyre modelling.
The automotive industry uses computer aided design (CAD) and computer aided engineering (CAE) widely to reduce design and development time and costs whilst improving quality and durability of the end product.
Almost every aspect of a new design, from manufacturing processes to dynamic performance, can be verified before any metal is cut. One area where this is not true is in the tyre performance arena where the ability to model tyre performance is far less well developed. Jaguar Land Rover is one company taking steps to close the gap by using the best available technology to generate the real world data essential for accurate tyre modelling.
The method adopted by Jaguar Land Rover uses Kistler RoaDyn Wheel Force Transducers for measuring the three forces and three moments of a rotating wheel under real world operating conditions. A large SUV fitted with four RoaDyn measuring wheels and other sensors is used to gather data about tyre performance on a variety of on-road and off-road surfaces.
An important advantage of the RoaDyn system is the data signals from the six 3-component strain gauge load cells are amplified in the load cell and fed to the wheel electronics where the data are filtered, digitized and coded. This significantly reduces signal noise and crosstalk before the data stream is transmitted via a rotor/stator pair to the wheel inner side, transformed in the on-board electronics unit and output to a data acquisition device. In the Jaguar Land Rover installation, approximately 170 data channels are acquired, with large sampling rates to capture the transient behaviour of the tyre, producing a huge amount of data for each tyre/road surface combination. In addition to testing tyres on its UK test track, Jaguar Land Rover also run tests on a variety of on-road and off-road surfaces ranging from vehicle dynamic platforms, to ice, snow and also mud to build up a comprehensive dataset for developing a highly precise, computer generated tyre model.
In common with other vehicle manufacturers, Jaguar Land Rover currently uses data from sandpaper covered belt test rigs. Whilst these rigs offer measurement consistency and repeatability, they do not represent real world road surfaces. The objective is to use the data from the RoaDyn system equipped vehicle, to develop a more accurate tyre model, relevant to real world driving conditions. The models can then be used in computer simulations to decrease development time and increase system robustness, resulting in a more efficient development process.
Simon O'Neill, Technical Specialist - Durability Measurement and Analysis at JLR, says, "In addition to providing much better quality real time data, the Kistler RoaDyn system is giving us greater insight into the performance of tyres, on and off road, which will enable JLR to significantly reduce physical testing, especially in environments with a restricted test window, for example winter testing. This will not only cut development costs, it will, in the medium to long term, allow us to co-operate with the tyre manufacturers to design the tyre we desire based on simulation results. With the robust data from the Kistler RoaDyn programme we will be able to confidently apply CAE to every part of the development process, including the tyres."
Kistler is the global leader in dynamic pressure, force, torque, and acceleration measurement. Cutting-edge technologies provide the basis for Kistler's modular systems and services.
Customers in industry, research, and development benefit from Kistler's experience as a development partner, enabling them to optimize their products and processes so as to secure sustainable competitive edge. Kistler plays a key role in the evolution of automobile production and industrial automation. Drawing on its vast application expertise and an absolute commitment to quality, Kistler drives innovations ahead in areas such as lightweight construction, vehicle safety, emission reduction, and Industry 4.0.
The Kistler Group is an independent, owner-managed Swiss corporation. Some 1 500 employees at 56 facilities worldwide are dedicated to the development of new measurement solutions, backed by individual application-specific support at the local level.
Since Kistler was founded in 1959, the company has grown hand-in-hand with its customers. In 2016, it posted revenue of GDP 289 million, about 10% of which is reinvested in innovation and research with the aim of delivering better results for every customer.
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