Seated Human Body Behavior Under Random Vibration

Lukić, Jovanka; Demić, Miroslav; Spentzas, C.N.

doi:10.4271/2002-01-2059

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…and 2,25, m/s 2 R.M.S.) were varied, Lukic [8], Demic et al [9], Lukic et al [14]. Symbols K 1,75 and S 2,25 represent positions of the seatback rest angle (K or S) and the number in the subscript shows the amplitude of initial excitation.…”

Section: Experimental Methodsmentioning

confidence: 99%

Human Body under Two-Directional Random Vibration

Demić

Lukić

2008

Journal of Low Frequency Noise, Vibration and Active Control

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Human body behaviour under the influence of two-directional random vibrations is of great importance for optimal motor vehicle design. Efforts are being made in order to discover as much information about the influence of vibration on human body as possible. References show that the most attention has been paid to vertical vibration, although intensive research has been performed lately on the other sorts of excitation. This paper shows the results of the investigation of behaviour of human body, in seated position, under the influence of random two-directional (fore and aft and vertical vibration). The investigation is performed using an electro-hydraulic simulator, on a group of 18 healthy male participants. Subjects are asked to adjust level of fore and aft excitation in order to give the same sensation as vertical excitation. Experiments are performed in order to give results which might improve human body modeling in driving conditions. Excitation amplitudes (0, 55, 1, 75 and 2, 25 m/s 2 R.M.S.) and seat backrest conditions (with (K) and without inclination (S)) were varied. Data results were analysed, and partial coherent and transfer functions analysis has been performed and results are given in detail. Human body transmissibility characteristics, under two directional random excitations, depend on its spatial position. Two directional random excitations affect human body transfer functions, which points out the fact that it behaves like a nonlinear dynamic system. This should be taken into consideration in synthesis of biodynamic vibration models of human body.

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Section: Experimental Methodsmentioning

confidence: 99%

Human Body under Two-Directional Random Vibration

Demić

Lukić

2008

Journal of Low Frequency Noise, Vibration and Active Control

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Investigation of the transmission of fore and aft vibration through the human body

Demić

Lukić

2009

Applied Ergonomics

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The effect of vibration characteristics of an automotive seating system on ride comfort – A finite element study

Ramalingam

Jebaseelan

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The Automotive Seating System (ASS) is an important sub-system in a car for increasing the ride comfort of driver/occupant and hence the need for a systematic study on the vibration characteristics of ASS is of importance. The present study finds out the vibration characteristics of four models of automotive seating system, with and without dummy mass using finite element analysis. The vibration mode shapes such as lateral, fore-aft and twisting of automotive seating system found in the frequency range 0-80 Hz for the four models of automotive seating system and correlated with experimental results found in the literature. The natural frequency of the seat with dummy mass was found to be in the human discomfort zone of the spinal column (10–12 Hz) and abdomen (4–8 Hz). The vibration transfer to occupant body was studied at 11 positions, with unit acceleration given at four mounting locations of automotive seating system in three directions separately. The vibration transmissibility was found to be higher than one in seat backrest. The random vibration analysis was carried out to identify the acceleration level of automotive seating system, subjected to smooth and rough road excitations. In the case of rough road random excitations, the results of root mean square acceleration values in automotive seating system show that the driver/passenger feels “fairly comfortable”. This study emphasizes the importance of the ride comfort of driver/occupant. To enhance the ride comfort, the stiffness of seat structure has to be modified and suspension system has to be introduced.

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Seated Human Body Behavior Under Random Vibration

Cited by 3 publications

References 5 publications

Human Body under Two-Directional Random Vibration

Human Body under Two-Directional Random Vibration

Investigation of the transmission of fore and aft vibration through the human body

The effect of vibration characteristics of an automotive seating system on ride comfort – A finite element study

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