MTS
weight of the vehicle through the rotating tires provides a region of high positive pressure on the belt, while the rear diffuser (and front wing sections of vehicles such as Le Mans prototypes or Formula 1 cars) provides a region of high negative pressure above the belt. Another example is model-scale aircraft aerodynamic landing studies. This often includes turbine engine thrust reverser simulation, which creates an extremely high negative pressure field next to an extremely high positive pressure field. The challenge lies in supporting both of these loads simultaneously. To maintain accurate aerodynamic simulation in such cases, it is important to keep the belt position flat and stable. With the latest rolling road systems, a constant belt height and position is achieved by supporting the belt on a film of compressed air pre-loaded with vacuum, an approach known in the industry as belt fly height control. Vacuum channels are located between the compressed air ports. Combined with the stiffness of the steel belt (see next section), this configuration supports a constant belt fly height, even when testing high-weight and high-downforce vehicles. All vehicles being tested can be run directly on the belt, allowing for high negative pressure above the belt and
Advanced belt tracking details for an MTS Rolling Road System
enabling through-the-belt force measurements. The compressed air film above the belt surface also reduces friction created by the moving belt traveling at high speeds, reducing steady-state power consumption of the drive motor.
motion of one of the rollers is controlled via closed loop feedback to track the steel belt consistently straight. The use of a steel belt varying from 0.5 to 1.0 mm thick (depending on the application) also benefits tracking, because steel stretches far less and is more stable than fabric at high 2 Advanced belt tracking and speeds, functioning similarly to steel belts stainless-steel belt Another major challenge with high-speed used in steel-belt radial tires. The steel is rolling road testing involves belt tracking. On welded with an advanced process to provide new-generation large-belt rolling road systems, an endless belt, and the roller surface is plated
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2009 | WIND TUNNEL INTERNATIONAL
Sept. 29 - Oct. 1 2009
Booth # 743
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