| | | wheel as closely as possible. In addition to the geometric requirements such as rim diameter and width, offset, hub pitch circle diameter, number of wheel studs and brake clearance, properties such as weight, moment of inertia and rigidity must correspond as closely as possible to those of the standard wheel in order to avoid extra mass impairing the running characteristics and measurement results. A low system weight and ease of adaptability for different vehicles or test stands are important features of the RoaDyn measuring wheels. Kistler uses adapters manufactured from composites (CFRP) or high-strength aluminum to minimize the weight of the measuring wheels. To also ensure | | the requisite strength and high rigidity, the relevant components are optimized using the finite element method (FEM). The combination of different designs of rim and hub adapter (RoaDyn P1xy/RoaDyn P6xy) or outside and inside parts (RoaDyn S6xy) allows adaptation specifically to meet the different constraints imposed by a variety of vehicles. Depending on the requirements, the systems are completed with offset and pitch circle adapters, insulation disks or heat shields. The modular construction and associated high degree of sensor configuration flexibility allow virtually any rim diameter between 12" and 24" to be achieved. Even larger diameters, for example 42", are fea- | | sible if required. Outside parts or rim adapters can be designed so that varying the form of the rim rings allows them to be used for several rim diameters. For reasons of weight and durability, rather than welding Kistler uses screw con nections exclusively between the precision-made wheel components. Kistler also prefers to employ high-strength, forged aluminum rim rings of its own manufacture. Particularly light rim assemblies are manufactured by laminating the rim well, the outside part made of CFRP, into the aluminum rim ring. Alternatively, the entire assembly can be made of CFRP. In addition to minimizing weight these solutions offer maximum rigidity. | | |