DS-JUNE23-PG12_Layout 1 15/06/2023 16:49 Page 1
FEATURE LINEAR MOTION
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A LINEAR SOLUTION FOR VEHICLE MOTION SIMULATION
vertical dynamics of the car as it goes over the bumps in the road, the cat’s eyes, potholes and rumble strips, and providing a very accurate representation to the driver and the passenger within the vehicle of those things.”
SPECIFYING THE RIGHT SOLUTION To meet the design requirements, the LA11 absolute magnetic linear encoder from Renishaw associate company RLS was specified to enable precise position control of the belt- driven actuators that drive the LFP responsible for large movements (excursions). The LFP comprises three belt driven actuators
When developing its high performance driving simulators, Dynisma specified absolute magnetic linear encoders from Renishaw. Here we find out why...
Dynisma’s aim is to develop high performance driving simulators that deliver realistic vehicle motion cues to both championship winning F1 drivers and automotive engineers evaluating the ride of an upcoming passenger car before it has been built. As a result, the company has pioneered DMG-1, a new class of motion generator that accurately simulates motion cues in minute detail to provide a totally immersive driving experience. It is also designed for vehicle dynamics testing and NVH (noise, vibration and harshness) applications in automotive development. Commenting on the generator, Warne said: “It is a technology that enables, for the first time, motorsport teams and automotive customers to carry out more realistic and higher fidelity tests than ever before. For example, the unique characteristics of this technology are its high bandwidth and very low latency. This means that our customers can put more information through their motion generator, providing a more realistic and immersive scenario than they have ever been able to before.” The motion system of DMG-1 is split into
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two parts: a high frequency platform (HFP) which delivers high fidelity and high bandwidth motion, and a low-frequency platform (LFP) which enables larger movements. A visual system is synchronised with the motion system to provide visual cues to the driver. The visual system is integrated within the motion generator. Joshua Bell, Dynisma’s DMG-1 engineering lead, explained: “When the
12 DESIGN SOLUTIONS JUNE 2023
ounded by Ash Warne, who previously ran the simulator teams at the F1 racing divisions of McLaren and then Ferrari,
driver is sitting in the chassis, they are fully immersed in the world that they see. When they are driving around, they are feeling both the motion cues from the simulator and seeing the visual cues from the visual system too. The two systems work in lockstep with each other.”
DEVELOPING A SMALLER, LIGHTER, SOLUTION
Many motion simulators are large, complex and expensive, so developing smaller and lighter versions without sacrificing perform- ance is becoming necessary.
Low latency is also critical. Latency is the delay between sending motion commands to the motion simulator and the actuation of the commanded motion. When the driver corrects for oversteer, they can only do so as quickly as the motion system provides feedback. In some simulators, where the latency is higher, extra understeer might have to be programmed into the vehicle model just to make the vehicle controllable. Low latency enables a fully correlated vehicle model to be used which gives the driver an accurate simulation of the real-world driving experience. In automotive design, the simulation of an
accurate full vehicle model is essential in representing the behaviour of the vehicle related to its dynamic system performance, such as ride comfort and handling. “Our technology’s incredibly low latency is particularly useful when the driver needs to respond very rapidly to the stimuli that they get from the motion generator,” said Warne. “The information that we provide through the motion generator is very dependent on the use case that our customer is evaluating. For example, automotive ride simulation is all about the
(ground rails) arranged in a triangle, which interface with the tri-base of the HFP via three passive radial rails. The three ground rails enable motion with three degrees of freedom (longitudinal, lateral, yaw) over a large excursion. In contrast, the HFP employs six actuators to enable six degrees of freedom in a smaller motion envelope but with higher fidelity. Of additional benefit for this application,
the electronics design of the LA11 provides short response and recovery times, while its communications interface options enable dual output of both absolute position readings via serial communication and incremental position readings. “The LA11 encoders are all on the low-
frequency platform,” explained Bell. So, on our demonstrator system we have got six on the three ground rails, which are the ones that go radially outwards, and on the customer systems we have nine. The encoders output to Beckhoff safety slices which feed into our safety program where we monitor the position and velocity of the system. As a result, we can safely shut down any system that exceeds its safe performance envelope. For this application an encoder was needed
that would gave absolute feedback and incremental feedback in the same readhead. The LA11 met these demands.
INTO THE FUTURE Dynisma is delivering three DMG-1 systems to customers in the automotive and motorsport sector over the next six to 12 months, with additional orders in the pipeline. “Dynisma delivers projects across the
world for our customers in both motorsport and automotive, in Europe, North America and beyond – so there is already a strong market for new Dynisma products such as DMG-1. We have a very strong working relationship with Renishaw and RLS – their products match our requirements and use cases very well,” Warne concluded.
Renishaw
www.renishaw.com
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