Search Results

With the Durability Transfer Concept a new methodology is presented, in which the fatigue damage under operational loading conditions in different areas of a vehicle is determined from the accelerations measured on the suspension. Thus long term measurements can be performed extremely cost efficient with only a 3 axis accelerometer on the suspension and a data logger. The accelerations are online processed, rain flow counted and by damage accumulation evaluated. The effort for the instrumentation of a vehicle and during measurements is reduced to a minimum. Counting into the rainflow matrices allows measurements without time limit. From the calculated damages of the accelerations the damage evolution of other quantities all over the vehicle is derived based on the durability transfer functions identified from short term measurements.

For the introduction of gear components from new materials manufactured with innovative technologies, reliable methods and data are needed to meet the requirements of modern light weight design. Data about the mission profile of the components in the drive line of passenger cars have been worked out by the European car industry based on the input and output torques. Loading and stress conditions inside of the gears, however, are not known in detail very much. This paper reports about extensive service measurements on the synchronization components of a gear of a passenger car. The short time measured data were evaluated by the results of long term measurements of the input and output torques on a large variety of passenger cars. Finite element calculation verified by the strain measurements was used to determine stress conditions in critical areas of the components based on the stress conditions in the measuring cross sections.