With such a variety in the product program and the components used, even a test and inspection program rapidly becomes complex. Does every single component really have to be tested? Does a separate prototype have to be set up for each model variant and then tested in the test bench? Or can the configurations in the technical specifications be tested more broadly?
A question that arises, for example, in the sector of function testing of components for car seats. Instead of setting up an expensive sample for each possible application case, CRH checks the individual components of the car seat before starting construction of a prototype. The prototype is only built and its performance put to the test once the optimal combination has been found.
A preliminary test looks at determining the loading data as they may occur in the actual application case. C. Rob. Hammerstein (CRH) equips a typical seat system with servo motors and strain gages for this purpose. The data obtained from this preliminary test are then used in the test bench.
In the test bench, the test setup consists of the linear drive to be tested and a servo motor that simulates the loading. The servo motor works against the linear drive and simulates the loading for the drive. Load profiles are run in the test to simulate a realistic situation.
Every test bench is only as good as the measurement technology used in it. This is why CRH is using HBM measurement technology. The S9M force transducer is positioned here next to the drive and measures the reaction forces. The results of the target-actual comparison are transferred to a PID controller and the servo motor is correspondingly adjusted.