Descriptive analysis of combine cabin vibrations and their effect on the human body

Hostens, Ivo; Ramón, Herman

doi:10.1016/s0022-460x(03)00578-9

Cited by 80 publications

(54 citation statements)

References 9 publications

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“…According to Gellerstedt (2002), 4,000 control inputs per hour have to be carried out by the operator, due to the lack of automatic functions of the boom and harvester head. Despite the ergonomic design of the cabs, the operators of mobile machinery are exposed mainly to noise (Hansson 1990;Axelsson 1998;Marsili et al 1998;Nieuwenhuis, Lyons 2002;Messingerová et al 2005;Sümer 2006;Beuk et al 2007;Gerasimov, Sokolov 2009;Aybek et al 2010;Bilski 2013), whole-body vibrations (Boileau, Rakheja 1990;Burdorf, Swuste 1993;Magnusson et al 1993;Hansson 1995;Huston et al 1999;Hinz et al 2002;Paddan, Griffin 2002;Hostens, Ramon 2003;Chen et al 2003;Sherwin et al 2004a,b;Deprez et al 2005;Kolich et al 2005;Tiemessen et al 2007;Li et al 2008;Gerasimov, Sokolov 2009), microclimatic conditions -mostly temperature, and airflow velocity inside the cab (Gao, Niu 2004;Kaynakli, Kilic 2005;Huang et al 2006;Mezrhab, Bouzidi 2006;Cengiz, Babalik 2007;Farzaneh, Tootoonchi 2008;Kim et al 2009;Zhang et al 2009a,b;Alahmer et al 2011), and severe mental and sensory load (Axelsson, Pontén 1990;Poschen 1993;…”

mentioning

confidence: 99%

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Martin¹,

Messingerová²,

Ferenčík³

et al. 2016

J. For. Sci.

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This article was aimed at assessment of selected factors of the work environment, which influenced the operators of harvesters and forwarders. The selection of the work environment factors was based on a thorough literature survey. From the survey exposure to whole-body vibrations, noise (equivalent and peak), microclimatic conditions and mental load were selected for detailed observations. The measurements were conducted according to international standards and assessed according to European or national legislation. Subjective assessment of the effects of the work environment was conducted through a structured interview. The exposure to whole-body vibrations was 0.5 m·s -2 . The equivalent noise exposure was 78 dB, peak noise exposure was 130 dB. The average temperature inside the machine cabs was 17.9°C and average airflow velocity was 0.06 m·s -2 . Mental load was high according to the Meister questionnaire, three operators considered the load inadequate, two considered it adequate. Subjective assessment showed that operators considered other factors to be light or no load.Keywords: noise exposure; whole-body vibrations; microclimate; mental load Work environment is a set of all conditions in which workers carry out their work. It consists of all workers and factors present at the workplace, or of those who have to do with the work and influence the health or comfort of workers. The worker is exposed to many harmful factors which interact and their joint effect can be synergistic or complementary (Schwartz et al. 2013).Operators of multi-operational machinery carry out their tasks in ergonomically designed cabs capable of partial attenuation of noise and vibrations caused by the machine movement, driving gear, and working parts of the machine. Cabs are also equipped with air conditioning and glare reducing windows. Some factors (e.g. electromagnetic, ionising radiation, various chemical factors, or energy expenditure) do not apply to the jobs of multioperational machinery operators. Their assessment would only consume time with no significant effect on the overall outcome of the assessment. The nature of work in mechanized logging partially shifted from physical to mental after employment of multi-operational machinery. The need for muscular activity decreased and the need to stay concentrated and alert through long periods grew in importance. Harvester operators have to be able to process a lot of information, react quickly, and retain their concentration in monotonous, repetitive operations (Axelsson, Pontén 1990;Poschen 1993;Gellerstedt 1997;Gellestedt et al. 1999;Tsioras 2012). Operating the machines is quite demanding. According to Gellerstedt (2002), 4,000 control inputs per hour have to be carried out by the operator, due to the lack of automatic functions of the boom and harvester head. Despite the ergonomic design of the cabs, the operators of mobile machinery are exposed mainly to noise (Hans-

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mentioning

confidence: 99%

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Martin¹,

Messingerová²,

Ferenčík³

et al. 2016

J. For. Sci.

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“…The need for cab and seat suspensions became more important as labour health costs increased, along with stricter requirements for operator safety, and the performance capabilities of machinery increased leading to greater vibrations, particularly in agricultural vehicles such as tractors not equipped with wheel suspensions (Hostens and Ramon, 2003).…”

Section: Suspension Seats and Air-springsmentioning

confidence: 99%

Modelling and design of a novel air-spring for a suspension seat

Holtz

Niekerk

2010

Journal of Sound and Vibration

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Fakulteit Ingenieurswese• Faculty of Engineering D e p a r t e m e n t M e g a n i e s e I n g e n i e u r s w e s e• D e p a r t m e n t o f M e c h a n i c a l E n g i n e e r i n g P r i v a a t S a k / P r i v a t e B a g X 1 • M a t i e l a n d , 7 6 0 2 • S u i d -A f r i k a / S o u t h A f r i c a , T e l : + 2 7 ( 0 ) 2 1 8 0 8 4 3 7 6• F a k s / F a x : + 2 7 ( 0 ) 2 1 8 0 8 4 9 5 8Modelling and Design of a Novel Air-Spring for a Suspension Seat Marco Wilfried HoltzFakulteit Ingenieurswese • Faculty of Engineering D e p a r t e m e n t M e g a n i e s e I n g e n i e u r s w e s e• D e p a r t m e n t o f M e c h a n i c a l E n g i n e e r i n g P r i v a a t S a k / P r i v a t e B a g X 1 • M a t i e l a n d , 7 6 0 2 • S u i d -A f r i k a / S o u t h A f r i c a , T e l : + 2 7 ( 0 ) 2 1 8 0 8 4 3 7 6• F a k s / F a x : + 2 7 ( 0 ) 2 1 8 0 8 4 9 5 8 AbstractSuspension seats are commonly used for earth moving machinery to isolate vehicle operators from vibrations transmitted to the vehicle body. To provide the required stiffness and damping for these seats, air-springs are typically used in conjunction with dampers. However, to eliminate the need for additional dampers, air-springs can be used in conjunction with auxiliary air volumes to provide both spring stiffness and damping. The damping is introduced through the flow restriction connecting the two air volumes.In this study, simplified models of an air-spring were derived followed by a model including the addition of an auxiliary volume. Subsequent to simulations, tests were performed on an experimental apparatus to validate the models.The air-spring models were shown to predict the behaviour of the experimental apparatus. The air-spring and auxiliary volume model followed the trend predicted by literature but showed approximately 27 % lower transmissibility amplitude and 21 % lower system natural frequency than obtained by tests when using large flow restriction diameters. This inaccuracy was assumed to be introduced by the simplified mass transfer equations defining the flow restriction between air-spring and auxiliary volume. The models however showed correlation when the auxiliary volume size was decreased by two thirds of the volume actually used for the experiment.This design of a prototype air-spring and auxiliary volume is presented for a suspension seat used in articulated or rigid frame dump trucks. The goal of this study was to design a suspension seat for this application and to obtain a SEAT value below 1,1. The design was optimised by varying auxiliary volume size, flow diameter and load. A SEAT value of less than 0,9 was achieved.iii UittrekselSuspensie sitplekke word dikwels in grondverskuiwingsvoertuie gebruik om bestuurders te isoleer van die vibrasies wat vanaf die voertuig se onderstel oorgedra word. Om die nodige styfheid en demping vir hierdie sitplekke te voorsien, word daar normaalweg lug-vere te same met dempers gebruik. Om die noodsaaklikheid van ekstra dempers uit te skakel, word lugvere met eksterne lug volumes gebr...

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“…It has been successfully used in various studies on the human body, mostly for whole body vibrations. Indeed, one of the main fields of interest of modal analysis in this scope is related to transport, including the effects of cabin vibrations [13] or the resonance behavior of the seated human body [14]. OMA and finite elements have already been used jointly to determine modal frequencies, damping and mode shapes, but only on a given part of the human body, e.g., the tibia [15].…”

Section: Introductionmentioning

confidence: 99%

FE Model and Operational Modal Analysis of Lower Limbs

et al. 2017

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Featured Application: In the field of public transport and sports, the development of specific materials able to absorb the modal frequencies identified in this paper will help decrease the amount of vibrations received by the human lower limbs. For example, shoes made of this material in running activities could prevent, or at least significantly decrease, injuries such as tibial stress syndrome. Moreover, the proposed model could be used to simulate dynamic solicitations stemming from different foot-strike patterns during running activities and, thus, to decrease stresses in the lower limb.Abstract: Human lower limbs are exposed to vibrations on a daily basis, during work, transport or sports. However, most of the FE (Finite Elements) and OMA (Operational Modal Analysis) studies focus either on the whole body or on the hand-arm system. The study presented herein aims at identifying the modal parameters of the lower limbs using a 2D FE model updated using OMA. A numerical model is proposed, and a modal analysis has been performed on 11 subjects. Two repeatable modal frequencies were extracted: 52.54 ± 2.05 Hz and 118.94 ± 2.70 Hz, which were used to update the mechanical properties of the numerical model. The knowledge of these modal characteristics makes it possible to design new equipment that would absorb these specific vibrations and possibly reduce the risk of related diseases in the field of sports and transport.

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Descriptive analysis of combine cabin vibrations and their effect on the human body

Cited by 80 publications

References 9 publications

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Objective and subjective assessment of selected factors of the work environment of forest harvesters and forwarders

Modelling and design of a novel air-spring for a suspension seat

FE Model and Operational Modal Analysis of Lower Limbs

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