Some Aspects of the Investigation of Random Vibration Influence on Ride Comfort

Demić, Miroslav; Lukić, Jovanka; Milić, Ž.

doi:10.1006/jsvi.2001.4252

Cited by 71 publications

(46 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amplitudes of the translational vibrations were defined at 0.55, 1.75 or 2.25 m/s 2 r.m.s for linear accelerations, and 0.63, 1.64 or 3.86 rad/s 2 r.m.s for angular accelerations. These acceleration levels are similar to previous studies [18][19][20]. The Vibration Total Values in the Part 1 study [21], as reported in Table I of this reference, were calculated based on chassis vibrations rather than vibration levels measured at the seatpan.…”

Section: Vibration System and Test Conditionssupporting

confidence: 77%

Multi-Axis Sinusoidal Whole-Body Vibrations: Part II — Relationship between Vibration Total Value and Discomfort Varies between Vibration Axes

Dickey

Eger

Oliver

et al. 2007

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

The influence of vibration duration and the amount of rest between successive vibrations was addressed in Part I of this study. The relationship between discomfort and Vibration Total Value for different axes of vibration is assessed in Part ll. Ten subjects were exposed to repeated single axis, planar, and 6 degree of freedom multi-axial vibrations. We observed statistically significant differences in discomfort between the different axes of vibration for similar ranges of Vibration Total Values. In particular. we observed that discomfort reports for vibrations in the Z axis and XY plane were less than discomfort reports associated with XZ plane and 6 df vibrations when the same range of Vibration Total Values were compared. Furthermore, single axis vertical vibrations were typically associated with less discomfort than multi-axis vibrations when similar ranges of Vibration Total Values were compared. This finding infers that the frequency weighting scheme presented in ISO 2631-1 does not achieve inter-axis equivalence and indicates that a more comprehensive study of multi-axis vibration is required to suggest changes to the ISO 2631-1 weighting factors.

show abstract

Section: Vibration System and Test Conditionssupporting

confidence: 77%

Multi-Axis Sinusoidal Whole-Body Vibrations: Part II — Relationship between Vibration Total Value and Discomfort Varies between Vibration Axes

Dickey

Eger

Oliver

et al. 2007

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…Because of the existence of intrasubjective and intersubjective variability of occupant's response (Griffin [2], Lukić [8], Demic et al [9]), and in order to improve the test credibility, all the analyses were done for the averaged occupants responses in the frequency domain.…”

Section: Test Results Analysismentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

Human Body under Two-Directional Random Vibration

Demić

Lukić

2008

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

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.

show abstract

“…It was also reported that the human body behavior under two directional random vibrations could not be approximated by superposition of one directional random vibrations 8) . Some biodynamic studies [9][10][11] have considered the effects of multi-axis vibrations rather than limiting the tests to single axis vibration.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of Distortion in Sketching under Mono and Dual Axes Whole Body Vibration

2011

View full text Add to dashboard Cite

Performance of sedentary activities such as reading and writing, in trains is known to be affected by the vibrations. An experimental study was therefore initiated to investigate the interference perceived in sketching task under low frequency random vibration in both mono and dual axes. Thirty healthy male subjects participated in the study. Random vibration stimuli were excited in various axes in frequency range of 1-20 Hz at magnitudes of 0.4, 0.8 and 1.2 m/s 2 . The task required the subjects to sketch the given geometric figures such as circle, rectangle and triangle under vibration environment in two subject postures (sketch pad on lap and on table). Three performance methods were used to measure the effect of vibration stimuli and posture. They consisted of two specifically designed objective methods for percentage distortion measurement and one subjective method using Borg CR10 scale. The results revealed that the percentage distortion and difficulty in sketching increased with an increase in vibration magnitude and was found to be higher for vibration in Y-and Z-axis. Similar trend was observed for percentage distortion and difficulty in sketching for dual axes also. The perceived difficulty and impairment in sketching performance was greater while sketching on lap for X-axis, while the effect was just the reverse for other axes.

show abstract

Some Aspects of the Investigation of Random Vibration Influence on Ride Comfort

Cited by 71 publications

References 17 publications

Multi-Axis Sinusoidal Whole-Body Vibrations: Part II — Relationship between Vibration Total Value and Discomfort Varies between Vibration Axes

Multi-Axis Sinusoidal Whole-Body Vibrations: Part II — Relationship between Vibration Total Value and Discomfort Varies between Vibration Axes

Human Body under Two-Directional Random Vibration

Quantitative Evaluation of Distortion in Sketching under Mono and Dual Axes Whole Body Vibration

Contact Info

Product

Resources

About