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Effects of seat design on vibration exposure and operator's comfort subjected to transient vibration
2001 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Whole body vibration research has shown that drivers are more likely to have back problem than other workers who are not exposed to vibration. The drivers experienced not only stationary vibration but also occasionally transient vibration. It was postulated that exposure to vibration that contains transient motion is more hazardous than stationary vibration. One of the solutions to reduce the severity of transient vibration is to improve the seat design. This study was done to evaluate different seat designs in aspect of minimising vibration transmission and reducing the level of discomfort experienced by drivers subjected to transient vibration. Two conditions of seat (sliding in horizontal direction and fixed) were compared in eight different conditions. The experiment design was based on three factors, sitting posture, speed and type of obstacle. The comparison was done by means of subjective and objective measurement. Eleven professional drivers were used as subjects. Maximum transient vibration value based on 1-second integration time (rms1s), seat effective amplitude transmissibility (S.E.A.T.), and narrow frequency band analysis was used in evaluation. Objective measurement showed that in high speed and in double obstacle, sliding seat is superior in attenuating transient vibration and vibration containing transient vibration in horizontal direction and pitching motion compared to fixed seat. Subjective assessment shows that sliding seat gave less overall and low back discomfort. For head and neck area, subjects perceived that seat design had no effect. The results also showed that sliding seat gave lower assessments of pitching and no differences in vertical and rolling assessment. Objective measurements are well correlated to subjective assessment. Calculation based on measurement in three degrees of freedom gave higher correlation value (0.821) compared to calculation based on single axis (0.806). When rotational motions are included in calculation even better results were found (0.914). Further studies are needed to formulate a new procedure for summation of multi-degree of freedom which is more appropriate than the procedure which is recommended by ISO 2631 to evaluate vibration environments that have a dominant mode of rotational motion.

Place, publisher, year, edition, pages
Keyword [en]
Technology, transient vibration: seat design: vibration transmission:, vibration discomfort
Keyword [sv]
URN: urn:nbn:se:ltu:diva-44611ISRN: LTU-EX--01/105--SELocal ID: 2627e0fd-653f-4e22-b42a-444fbb5aa5acOAI: diva2:1017890
Subject / course
Student thesis, at least 15 credits
Educational program
Ergonomics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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