Investigation of MR Dampers for Enhanced Crashworthiness and Vibration Isolation of Helicopter Crew Seats

This study explores the use of magnetorheological (MR) fluid dampers in a semi-active seat suspension system for helicopter crew seats. Key challenges in designing a magnetorheological energy absorber (MREA)-based seat suspension system for both enhanced crashworthiness and vibration isolation are identified. Furthermore, relations are made between MREA design parameters (maximum force, dynamic range, etc.) and resulting performance. Three MREA design options are considered: one optimized solely for vibration isolation, one for enhanced crashworthiness, and one that is simultaneously capable of both enhanced crashworthiness and vibration isolation. Resulting metrics such as performance, capabilities, weight, and size are compared, and the benefits and sacrifices associated with each of these designs are discussed. It is shown that MREAs are capable of achieving the dual goals of enhanced crashworthiness and vibration isolation, but practical implementation is hindered by a sacrifice to size and weight resulting from conventional MR damper technology.