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Active Seat Suspension to Control Low Back Injuries.

PB94158482

Publication Date	1993
Personal Author	Johnson, C. C.
Page Count	42
Abstract	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 a 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%.
Keywords	Trucks Seats Vibration damping Human factors engineering Backache Suspension systems(Vehicles) Control systems Hydraulic cylinders
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	85H - Road Transportation 95D - Human Factors Engineering
Corporate Authors	RehabTech, Inc., Burlington, VT.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199413

Active Seat Suspension to Control Low Back Injuries.

Active Seat Suspension to Control Low Back Injuries.
PB94158482

Publication Date	1993
Personal Author	Johnson, C. C.
Page Count	42
Abstract	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 a 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%.
Keywords	Trucks Seats Vibration damping Human factors engineering Backache Suspension systems(Vehicles) Control systems Hydraulic cylinders
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	85H - Road Transportation 95D - Human Factors Engineering
Corporate Authors	RehabTech, Inc., Burlington, VT.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199413