Natural Frequency Analysis of Automotive Seating System by using fem software

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Human body part	Natural frequency	Natural frequency of components	Natural frequency of Seat (Hz)	Resonance
Hand	30-50	Arm rest	44.21	Yes
Spinal	10-12	Back rest	20.89	No
Head	20-30	Head rest	33.94	No
		Engine(35Hz)	33.94	Yes

TableV5: Comparison of human body part and components for cast iron material

Previous analysis of the both material resonance occurs in seat assembly then it requires change natural frequencies of seat isolate from the range of other component frequency and human body for avoiding the resonance phenomenon.

VII. SEAT MODIFICATIONS AND ANALYSIS

The design modification process included the development of a finite element model using Hypermesh that was suitable for computing natural frequency in individual members of the seat assembly under dynamic loadings.

A. Steel and Cast Iron Material for Seat

The new seat assembly model is generated by using both steel and cast iron material because from previous analysis we can find that individual steel or cast iron has resonance frequency so modification of seat can be done with both material are used for assembly of seat for the avoidance of the resonance .

Fig. 4: Modified seat with two materials

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pdf -> International Journal on Mechanical Engineering and Robotics (ijmer)

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