Multi-Axis Sinusoidal Whole-Body Vibrations: Part I — How Long Should the Vibration and Rest Exposures Be for Reliable Discomfort Measures?

Dickey, James P.; Oliver, Michele; Boileau, P.-É.; Eger, Tammy; Trick, Lana M.; Edwards, A. Michelle

doi:10.1260/026309206779800470

Cited by 27 publications

(23 citation statements)

References 27 publications

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“…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. Therefore, a second series of vibration exposures, which included vibration measurements at the seatpan were performed on three of the subjects from the original study (Subjects 8, 9 and 10) in order to evaluate the relationship between vibration levels at the chassis and vibration levels at the seatpan.…”

Section: Vibration System and Test Conditionssupporting

confidence: 79%

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

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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.

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Section: Vibration System and Test Conditionssupporting

confidence: 79%

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

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“…The subjects were exposed to 15 seconds of vibration at each frequency and experienced a 5 second resting period between tests. This duration is acceptable as found by Dickey et al [4]. The subjects rated their perceived discomfort during vibration by comparing it with their perception during the resting period.…”

Section: Subjective Reported Discomfortmentioning

confidence: 58%

Predictive Discomfort and Seat-to-Head Transmissibility in Low-Frequency Fore-Aft Whole-Body Vibration

DeShaw

Rahmatalla

2011

Journal of Low Frequency Noise, Vibration and Active Control

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A predictive discomfort measure considering the combined neck and trunk is introduced in this work and compared with the seat-to-head transmissibility and subjective reported discomfort due to fore-aft whole-body vibration of seated subjects under two sitting postures. Five subjects were tested using discrete sinusoidal frequencies in the range of 0.5-12 Hz. All files were run at a constant acceleration of 0.8 m/s 2 . The subjects were tested with back support and without back support, and their subjective discomfort measure was reported based on the Borg CR-10 scale. The results have demonstrated that the predictive discomfort was invulnerable to the measurement locations and has shown consistency with the subjective discomfort for both sitting conditions. The seatto-head transmissibility showed less consistency with the subjective discomfort and was sensitive to the locations of the output point on the head and to the components of the motion included in the transmissibility calculation at these locations.

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“…3). Peak FTA transmissibility above one, implying amplification, occurred at 25 Hz for three participants (20,21,30), at 30 Hz for six participants (2,4,17,19,22,28), at 45 Hz for one participant (9) and 50 Hz for one participant (11) ( Table 3). Furthermore, peak FTM transmissibility above one occurred at 50 Hz for thirteen participants, while only one participant (30) had a peak greater than one at 25, 30 or 35 Hz (Table 3).…”

Section: Resultsmentioning

confidence: 99%

“…During the 45 second exposure period FTM and FTA vibration transmissibility was measured. Participants rested for 10-seconds after each 45 second vibration exposure [4].…”

Section: Vibration Exposurementioning

confidence: 99%

“…FTV exposure has been reported in mining, farming, forestry and construction [2,[4][5][6]. Miners can be exposed to FTV when operating locomotives, bolters, jumbo drills, or drills attached to platforms workers stand on [2] and several researchers have published reports indicating miners have reported pain, discomfort, and blanching in the toes more often than co-workers not exposed to vibration via the feet [2,3,7].…”

Section: Introductionmentioning

confidence: 99%

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Study of the biodynamic response of the foot to vibration exposure

Goggins

Godwin

Larivière

et al. 2016

OER

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Abstract.BACKGROUND: Exposure to foot-transmitted vibration (FTV) has been linked to injury; however, the biodynamic response of the foot to FTV has not been quantified. OBJECTIVE: The objective was to measure vibration transmissibility from the floor-to-ankle, and the floor-to-metatarsal, during exposure to FTV while standing, and to determine if FTV exposure frequency, or participant mass or arch index (AI) influence the transmission of FTV through the foot. METHODS: Participants' AI was measured. Four ADXL326, tri-axial accelerometers were utilized to measure vibration on the platform medial to distal head of first metatarsal, on the distal head of first metatarsal, on the platform paralleling the medial malleolus, and on the lateral malleolus. Participants were randomly exposed to FTV at 25 Hz, 30 Hz, 35 Hz, 40 Hz, 45 Hz, and 50 Hz for 45 seconds. CONCLUSIONS:The greatest transmissibility magnitude measured at the metatarsal and ankle occurred at 50 Hz and 25-30 Hz respectively, suggesting the formation of a local resonance at each location.

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Multi-Axis Sinusoidal Whole-Body Vibrations: Part I — How Long Should the Vibration and Rest Exposures Be for Reliable Discomfort Measures?

Cited by 27 publications

References 27 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

Predictive Discomfort and Seat-to-Head Transmissibility in Low-Frequency Fore-Aft Whole-Body Vibration

Study of the biodynamic response of the foot to vibration exposure

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