This paper describes an active control system aimed at minimizing vertical vibrations from the seat to the human body in a vehicle. This system controls mechanical properties such as spring constants and damping coefficients on the basis of vibration analysis. In our previous study, this active control system could not be validated for a model that considers the steering wheel. This study aimed to clarify the relationship between the mechanical properties of the seat and the vibrations of the human body in a seat–steering wheel–occupant system. Then, a vibration model for such a system was designed and the influence of seat cushions on the vibrations of the human body was examined using this system. The mechanical properties of the bearing surface and the back of the seal were controlled with reference to 1/5–5 times the standard condition, and the influence of seat cushions on the vibrations of the human body was examined by using this system. From these results, the effectiveness of the vibration model and the analytical system was examined by comparing the frequency response results of the analysis and an experiment. It was clarified that the frequency of the first resonance point changed significantly when the mechanical properties of the seat-bearing surface were modified, and the frequency of the second resonance point changed significantly when the mechanical properties of the seat back were modified.
This paper describes a vibration reduction system that can minimize the vertical vibrations of the human body in a vehicle. This system can control the mechanical properties of the seat cushions, such as the spring constants and damping coefficients. To examine the feasibility of this vibration reduction system, we design a vibration model of both an occupant–seat–steering wheel–pedals–vehicle system and a calculation system. Further, we carry out a numerical analysis to calculate the magnitude of vibrations transmitted from the road surface to the human body based on ISO7096-EM6. Comparison results of the frequency response between the analysis and the experiment indicate the feasibilities of both the vibration model and the analysis method. Furthermore, vibration of the head was reduced 60.1% by controlling the mechanical properties of the seat from 1/5 to 5 times. In summary, the in-vehicle vibration reduction system successfully reduces vibrations from the seat to the human body.
system . The body has six parts such as head , chcst, thigh , shin , upper am and lower amL And vehicle has 止 ree parIs suc 血 as spnmg mass , 廿ont unsprung mass − and rear sprung mass . We have investigated the 爬 duction rate ofth ¢ vertical vibrations on the head , shin Imd lower arm which are importa 血t parts on operation whi 且 e driving . From the results , it is shown that the validity ofthis model and that に 1ationships between the reduction rates and the mechanical properdes of thc cac レ seat oushion fbr frequenCy band.
Science and System Engineering lllKuboki , S() ja − shi, Okayama, 719 − 1197, Japan This paper describes an aCtive control system to minimize vertical vibrations f 卜 om the seat to the human body in a vehicle . This system controls mechanical properties ofthe seat such as the spring constants and damping coefflcients. In this system , vibrations are transmitted from the steering wheel to the human bOdy. To examine the influence of seat cushions on the vibrations ofthe human body in a seat − steering wheel − occupant system , we designed a vibration modcl and calculated the vibration of the human body by numerical analysis . Thc analytica ]results clarified the relationship between the mechanical properties ofthe seat cushion and the vibration characteristics ofthe human body .
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