51 Dynisma DMG family | Digest E-Mobility Engineering | January/February 2025 mismatch between what drivers see and what they feel. Bandwidth refers to the range of frequencies over which the simulator can respond accurately to driver inputs and replicate the dynamics of the vehicle being modelled. Dynamic events range from low-frequency motions, such as gradual acceleration and cornering, to high-frequency phenomena such as vibrations and bumps. Sufficient bandwidth ensures both low- and high-frequency dynamics are represented accurately, and it is crucial to represent the behaviour of anti-lock braking, traction control, lane-keeping assistance and other advanced driver assistance system (ADAS) technologies. High fidelity and low latency enable precise testing of features such as torque vectoring, regenerative braking and the handling characteristics of EV platforms. Holloway explains: “If you’re using fourwheel torque vectoring, you could replay and feel what’s happening within each wheel, just like it does on the real vehicle.” Precision is important given the shift in EV design paradigms, such as the use of skateboard-style chassis/battery pack combinations and lower centres of gravity, needing reoptimisation of suspension geometries and vehicle dynamics. Frequency response and fidelity Holloway emphasises the importance of the simulators’ ability to replicate real-world vibrations and oscillations. With frequency capabilities exceeding 100 Hz, the DMG simulators provide high-resolution feedback that mirrors the tactile sensations of driving. “If you drive over a 5 mm painted cleat or curb, the high fidelity means you feel every little movement underneath the car,” he says. This level of detail is critical for both motorsport and roadcar applications as it captures the nuances of tyre behaviour and surface interactions. Holloway argues that the ability to test and refine tyre designs early in the development cycle is a major benefit. He points out that simulators can align tyre performance with vehicle characteristics much earlier than traditional methods, reducing reliance on mule vehicles, which often compromise tyre designs. Unique motion system Dynisma’s motion system is designed to be highly adaptable and capable of simulating a wide range of vehicles with minimal setup changes. Engineers can also scale motion inputs to match the Family values The DMG-1 is Dynisma’s entry-level simulator, designed for vehicle dynamics, ride and performance testing. It has been adopted by several OEMs, including McLaren Automotive. The DMG-X represents a step up, offering higher frequency, heave and payload capabilities, making it suitable for applications such as noise, vibration and harshness (NVH) testing, and simulating larger vehicles such as SUVs. The flagship model, the DMG-360XY, features a 5 m travel range and unlimited yaw, which enables realistic simulations of complex manoeuvres, such as lane changes and city driving without the constraints of recentring. “In traditional simulators with limited yaw, obviously, if you’re driving around a city block or around a roundabout, at some point the simulator has to move itself back to centre. With unlimited yaw, the simulator never recentres,” he says. “Velocity in yaw is one of those things that you really feel, so if you can remove that miscue, it obviously helps the immersion in the scenario.” Holloway says one of the most revolutionary aspects of Dynisma’s simulators is its focus on minimising latency and maximising bandwidth, addressing two major issues in traditional systems. “In simulators that have much higher latencies and lower bandwidths you sometimes feel like you’re driving on glass or a magic carpet. You have that floating feeling, because they don’t have the definition and the fidelity for what you’re driving on,” he says. “Latency is one of the biggest issues,” he adds, noting that typical simulators exhibit 20-30 milliseconds of delay, which disrupts realistic driving responses. In contrast, Dynisma’s simulators can achieve latency of 3-5 milliseconds, which ensures a seamless connection between driver inputs, vehicle model responses and motion cues. This precision significantly enhances the realism of the driving experience, and prevents motion sickness caused by the Entry-level DMG-1 is aimed at the development of vehicle dynamics, ride and performance, featuring direct-drive motion and high bandwidth for realistic driver feel
RkJQdWJsaXNoZXIy MjI2Mzk4