A prototype semi actively controlled vehicle seat suspension system was designed, built, and tested. The seat suspension system was intended to reduce low back injuries caused by exposure to vertical vibration. The suspension system used a computer controlled continuously variable hydraulic damper and passive spring elements. The system was tested using a truck seat rigidly mounted onto an hydraulically actuate cylinder used for vibration testing; the input signal was actual road test data for a truck. A human model was used to simulate the dynamic properties of a human sitting on the seat. An overall reduction of 16% root mean square acceleration was realized with the controlled seat suspension system when compared to the same system operating in passive mode. Vibration at the human's natural frequency of 5 hertz was reduced as much as 23.3%.
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