Journal articles on the topic 'Iso 2631-1 1997'

This research expects to investigate yet at domestic-dump truck driver, carry on the preliminary vibration determination. This research studies ten dump trucks in Yunlin County and precede questionnaire at the sandstone field. The ISO 2631-1:1997 and Article 301 in Taiwan’s regulation “Rules of Equipment and Measures for Protecting Labors’ Safety and Health” are used to evaluate tolerable exposure time per day for drivers. And in accordance with ISO 2631-5:2004 to assessment healthy risk for dump truck driver. In accordance with Article 301 of Labor Safety and Health regulation in Taiwan’s to estimate tolerable exposure time. A half tolerable exposure time present lower than 8 hours. In accordance with ISO 2631-1:1997 to estimate tolerable exposure time, no matter use equation B.1 or B.2 to calculate tri-axis compose acceleration. All tolerable exposure time present lower than 8 hours. If basis of ISO 2631-5:2004 to evaluation healthy risk for driver.

The paper compares measurement-based measures for human vibration exposure. Data were collected during sea trials on a 10 m, 50 kn coastguard craft equipped with a three-axial accelerometer at the coxswain seat and with vertically mounted gauges measuring the acceleration of the cockpit floor. The ISO 2631-1:1997 measures of vibration (namely the root-mean-square (r.m.s.) value of the whole-body vibration (determined from the frequency-weighted acceleration signal), the maximum transient vibration value (MTVV), and the vibration dose value), the ISO 2631-5:2004 measure (namely the daily equivalent static compression dose Sed), and also statistically based measures to evaluate the acceleration magnitude are compared and discussed with respect to their ability to identify the mitigating effect of the suspension seat and how the different measures rank the severity of the high-speed craft (HSC) ride. The paper concludes that the r.m.s. value and the MTVV are unsuitable for evaluation of the conditions aboard while the other investigated measures show potential in this respect. Further the approach of ISO 2631-5:2004 taking both the short-term and the long-term perspectives on the human exposure to vibration is concluded to be the most mature method well suited to evaluation of HSC conditions.

Whole-body vibration exposure levels were measured during the operation of fifteen different types of mobile mining equipment commonly used in Ontario mines. A tri-axial seat pad accelerometer was used to measure vibration exposure when the mining vehicle was operated from a seated position and a tri-axial accelerometer secured to floor, between the operator's feet, was used to measure vibration exposure when the mining equipment was operated from a standing position. Measurements were conducted in accordance with the procedures described in the 1997 ISO 2631-1 standard. Determination of likely health risks for equipment operators were based on a comparison of the measured vibration exposure levels with Health Guidance Caution Zone limits presented in Annex B of the ISO 2631-1 standard. Six vehicles (UG haulage truck, bulldozer, 3.5 yard LHD, cavo loader, muck machine, and personnel carrying tractor) were above the Health Guidance Caution Zone limit, assuming an eight hour exposure period while four vehicles (grader, 7 yard LHD, scissor lift truck and locomotive) were within the Health Guidance Caution Zone limit.

Vibration is experienced when a body is subjected to either internal or external forces which cause oscillation, with most operators of industrial equipment often exposed to high dosage, higher than the stipulated values. In this research, Digital Real-Time Frequency Analyzer (RSA 5106A) was used, while the results obtained were evaluated and compared with the health guidelines of the ISO 2631-1 : 1997 and ISO 2631-5 : 2004 standards, as described in the Health Guidance Caution Zone for a daily exposure action value (EAV) of 0.47 m/s2 and a daily exposure limit value (ELV) of 0.93 m/s. High acceleration was mostly seen on the z-axis in all the results obtained, whereas many were not within the HGCZ (Arms <0.47, and >0.93 m/s2). Comparing (VDV <8.5 m/s1.75 and >17 m/s1.75) with the ISO standard, the accelerations on all x- and y-axes were slightly within the HGCZ, with just a little below 0.47 m/s2 limit. The results obtained clearly showed that urgent action is needed virtually on all the equipment in both the Secondary Manufacturing Department (SMD) and Primary Manufacturing Department (PMD) to minimize vibration exposure on the technical operators.

Buses are one of the important public transportation in Malaysia and commonly important for the student in any university. Thus, the study about Whole-Body Vibration (WBV) exposure induces to Low Back Pain (LBP) among the Universiti Tun Hussein Onn Malaysia (UTHM) was done. The objective was determine whether the bus drivers in UTHM would exceed the exposure action and limit values from the ISO 2631-1 (1997) during the working hours. Data collected according to different type of buses and evaluated the vibration significant different between buses based on the subjective correlation due to WBV questionnaire analysis. Analyze the prevalence of LBP based on the measurement and the questionnaire analysis. The study based on the international standard ISO 2631-1 (1997) which is related to the root-men-square (r.m.s) and Vibration Dose Value (VDV) parameter. The study covered among the bus drivers in UTHM. The measurement tools involved in the study is Larson Davis Vibration Meter (HVM 100) with Tri-axial Seat Pad Accelerometer to record data collection. The BLAZE software analyze the vibration exposure exceed the total vibration exposure according to 8 hours day A(8) value of 1.15 m/s2 and VDV value of 21.0 m/s1.75. The IBM Statistical Package for Social Science (SPSS) was used to do statistical analysis and testing involved was correlation, regression and ANOVA. Result obtained shows the A(8) and VDV was under EAV with highest value of 0.520 m/s2 and12.65 m/s1.75. The highest contribution factors by the duration to complete single trip per day (α=0.500).The further re-assess of working schedule need to be done in order to control the exposure level toward drivers. The assessment should be done for every two years.

Buffeting response of a double-sided catwalk designed for Maputo Bridge was investigated considering wind load nonlinearity, geometric nonlinearity, and self-excited forces. Buffeting analysis was conducted in time domain using an APDL-developed program in ANSYS, and the results were compared with the buffeting response under the traditional linear method. The wind field was simulated using the spectra representation method. Aerostatic coefficients were obtained from section model wind tunnel test. Parameter study has been carried out to investigate the effects of cross bridge interval and the gantry rope diameter on buffeting response. Referring to the ISO 2631-1(1997) standard and the annoyance rate model, the comfort of catwalk due to wind-induced vibration was evaluated. The results indicate that traditional linear calculation methods will underestimate the buffeting response of the catwalk, and enlarging the gantry rope size as well as decreasing the cross bridge interval would increase the comfort level. Moreover, the effect of gantry rope diameter was obvious than that of cross bridge interval. Annoyance rate model can evaluate the comfort level quantitatively compared to the ISO standard.

Pedestrian-induced vibration comfort is an important factor affecting the serviceability of footbridges. This article proposes a smartphone-based evaluation system for pedestrian-induced footbridge vibration comfort, and the evaluation system consists of a data acquisition subsystem, management center subsystem, and smartphone client. Four technical challenges in the application of the evaluation system are solved: coordinates transformation, acceleration signal drift correction, signal filtering, and computation of the total weighted root mean square acceleration. To verify the validity of the proposed evaluation system, field experiments are carried out on the Forth Corridor Footbridge in Guangzhou. A comparison of the proposed system and the traditional methodology shows that the total weighted root mean square acceleration errors between smartphones and accelerometers are less than ±5%. In addition, the subjective feelings in the field experiments are in excellent agreement with the corresponding stipulation in ISO 2631-1:1997 (Amendment 1. International Standardization Organization, Geneva, 2010).

New original results are presented on relation between passenger’s whole-body vibration (WBV) and longitudinal road unevenness characterised by the International Roughness Index (IRI) in 100-m segments. Measurements were provided in nine different cars of six vehicle categories operated on about 1860 km of road network. Vibration total value based on the root mean square (RMS) of the frequency-weighted acceleration was used to quantify the ride comfort at seat surface and seat base (i.e. vehicle floor) in three orthogonal axes. The relations between passenger’s acceleration response, comfort reaction levels according to the ISO 2631-1: 1997 and the IRI road unevenness classes, used by the Slovak Road Administration, were estimated. Results indicated higher WBV by ~ 20 % on the motorways than on the 1st and 2nd class roads in the same IRI road class. Using the same IRI road classes for motorways and the 1st and 2nd class roads seems not to be appropriate from the point of view of the whole-body vibrations.

In this paper, a four degrees of freedom biodynamic human body model is used for ride comfort analysis, which is coupled with a three degrees of freedom quarter car model. The random road profile is generated in a simulation environment using the ISO 8608:2016 standard. In order to suppress the adverse effects of road induced vibrations on the human body, a super-twisting sliding mode control (STSMC) and adaptive neuro-fuzzy inference system (ANFIS) based super-twisting sliding mode control (ASTSMC) strategy is used in the main suspension of the active quarter car model. The ride comfort response of the human body segments is compared for passive and active suspension systems using the ISO 2631-1:1997 standard. Based on the simulation results in time and frequency domain related to acceleration and displacement response for head and neck, upper torso, viscera and lower torso, it is shown that the ride comfort provided by the ASTSMC controller is much improved compared to the STSMC and passive control method. It can be finalized from the present research work that active suspension with the ASTSMC control strategy can successfully reduce the adverse effects of road induced vibrations on human body health and safety.

The purpose of this work is to evaluate the performance of novel hydrfo-pneumatic suspension system (HPSs) in comparison with traditional hydro-pneumatic fsuspension system (HPSs) of a heavy truck in the direction of improving vehicle ride comfort. Firstly, the nonlinear dynamic models of the traditional and novel HPS systems are set up to determine the vertical forces. And then, the vertical forces are connected with a 3-D nonlinear dynamic model of heavy truck with 10 degrees of freedom under random excitation of road surface. The root mean square (RMS) acceleration responses of the vertical cab, pitch and roll angles of the cab (awzcb, awfcb and awtcb) based on the International Standard ISO 2631-1: 1997 are chosen as objective functions. The study results show that the awzcb, awfcb and awtcb values with novel HPSs reduce by 28.27%, 28.32% and 6.89% in comparison with traditional HPSs when vehicle moves on ISO class D road surface at vehicle speed of 50 km/h and full load. Finally, the ride performance of novel HPSs is verified and compared and evaluated with traditional HPSs under different operating conditions and the evaluation results are also indicated that the ride performance of a novel HPSs is better than the traditional HPSs under survey conditions.

Exposure to high levels of whole body vibration (WBV) from the seat can present risks to health and safety and cause injuries to drivers. This study presents a study on WBV exposure to Malaysian Army 3-tonne truck drivers using the method defined in International Standard ISO 2631-1:1997. The vehicle that was chosen for this study was based on the highest number of vehicles available within the Malaysian Army services. 3-tonne truck is the most widely used in Malaysian Army services. WBV from the drivers were measured using tri-axial accelerometer and was connected to Brüel & Kjær Vibration Analyser Type 3649, which is capable to produce raw data to calculate the vibration dose value (VDV). The raw data from each axis were analyzed using statistical analysis method, Integrated Kurtosis Algorithm for Z-notch Filter (I-kazTM) 3D to determine the vibration values in relation to varying speed of the vehicle. Based on the results, WBV experienced by the drivers can be presented in VDV and I-kazTM 3D coefficient which the value will increase proportional to the truck speed.

Vibration at the pedal-pad can contribute to discomfort of foot plantar fascia during driving. This study was conducted to determine the Pedal-pad Effective Amplitude Transmissibility (PEAT) value and comparison frequency-weighted root-mean-square (r.m.s) acceleration on z-axis vibration magnitude for three different sizes of pedal-pad on the two different road surfaces (tarmac and paved). ISO 2631-1:1997 was used for frequency-weighting (Wk) and frequency weighting r.m.s acceleration values calculated in one-third octave step with range of frequency 0.5 Hz to 80 Hz in z-axis vibration. The result shows that the percentage of PEAT value on paved road surface is more than 100% and when compared to tarmac road surface are much higher for all three sizes of pedal-pads. Based on frequency-weighted r.m.s acceleration for three different sizes of pedal-pad, the paved road surface contributed more vibration to pedal-pad compared with the tarmac road surface. In conclusion, the paved road surface produced higher Z-axis vibration transmissibility from car-body to pedal-pads compared to tarmac road surface.

The objective of the study is to measure the whole body vibration (WBV) transmitted to the driver as well as the passengers during the operation of bus and to compare results with ISO 2631-1(1997) comfort chart and health guidance criteria. In this study, vibration exposure of the driver, passenger in the mid row seat and passenger in the rear row seat were measured at different operating conditions (static and dynamic). The BMI (Body Mass Index) was maintained for driver and passengers. The results of static test showed that the driver seat produced more vibrations compared to the passenger's mid row and rear row seat. This is due to the fact that driver seat was positioned close to the engine cabin. The results of dynamic test showed that, in all cases, the rear seat produced maximum vibrations. At 40 km/h speed the vibration magnitude exceeded the exposure limit at all tested seats. This high vibration magnitude might be due to the resonance effect caused between engine and chassis vibrations.

O presente artigo realizou uma análise técnica dos limites e metodologias adotados para avaliação de vibração ocupacional de corpo inteiro em 56 países. O artigo também discute as metodologias e justificativas adotadas no Brasil para avaliar a vibração de corpo inteiro que difere da maioria dos países. A vibração constitui um fator de risco para a saúde nos ambientes ocupacionais se dá de forma total, ou seja, é transferida para todo o corpo. Devido aos diversos efeitos à saúde, atualmente 29% países possuem limites legais para a vibração de corpo inteiro. Quase a totalidade dos países adotam as metodologias e procedimentos da ISO 2631-1, mas não necessariamente adotam os valores do guia de orientação à saúde adotado em 1997. Os valore limites adotados mundialmente 67% estão acima do limite superior da zona de cautela para o método Root mean square (rms) que é o utilizado por 100% dos países, enquanto método adicional VDV é adotado por menos de 11%. A aceleração do pior eixo para avaliar o rico à saúde conforme determina o padrão ISO é adotado por 96,6% dos países. O Brasil adota a metodologia resultante que é a soma quadrática dos três eixos, mas não foram encontrados evidencias que embasem tão escolha. Conclui-se que o Brasil deve revisar os limites adotados atualmente que são mais restritivos, mais não constitui maior proteção, pois os efeitos da vibração dependem de múltiplos fatores, que incluem, por exemplo, fatores ergonômicos da atividade laboral.

Wheelchair propulsion exposes the user to a high risk of shoulder injury and to whole-body vibration that exceeds recommendations of ISO 2631-1:1997. Reducing the mechanical work required to travel a given distance (WN-WPM, weight-normalized work-per-meter) can help reduce the risk of shoulder injury, while reducing the vibration transmissibility (VT) of the wheelchair frame can reduce whole-body vibration. New materials such as titanium and carbon are used in today’s wheelchairs and are advertised to improve both parameters, but current knowledge on this matter is limited. In this study, WN-WPM and VT were measured simultaneously and compared between six folding wheelchairs (1 titanium, 1 carbon, and 4 aluminium). Ten able-bodied users propelled the six wheelchairs on three ground surfaces. Although no significant difference of WN-WPM was found between wheelchairsP<0.1, significant differences of VT were foundP<0.05. The carbon wheelchair had the lowest VT. Contrarily to current belief, the titanium wheelchair VT was similar to aluminium wheelchairs. A negative correlation between VT and WN-WPM was found, which means that reducing VT may be at the expense of increasing WN-WPM. Based on our results, use of carbon in wheelchair construction seems promising to reduce VT without increasing WN-WPM.

Background: Non-invasive application of whole-body vibration (WBV) has the potential for inducing improvements in impaired peripheral circulation, cutaneous sensation and balance among older adults. However, relevant studies have frequently applied high magnitudes of vibration and show conflicting and inconclusive results. Therefore, we attempted to ascertain the acute responses in those parameters from exposure of thirty older subjects to WBV of three different magnitudes, defined according to ISO 2631-1 (1997). Methods: Each subject randomly underwent four sessions of intervention (three bouts of 1 min exposure with 1 min between-bout rests): WBV at 15, 20, or 25 Hz with a peak-to-peak displacement of 4 mm, or control condition. Results: Both during and after intervention, dorsal foot skin blood flow increased significantly under 20 and 25 Hz exposure conditions with greater responses under the latter condition, the magnitude of which slightly exceeded the recommended value. Plantar vibrotactile perception showed significant increases after WBV exposure with overall greater responses under higher frequencies of vibration. In contrast, no WBV-induced change in balance was observed. Conclusions: WBV at 20 Hz with a magnitude within the recommended limit can be effective in inducing enhancements in peripheral blood flow; however, the same magnitude of vibration seems insufficient in improving balance among older adults.

A lot of health issues like low back pain, digestive disorders, and musculoskeletal disorders are caused as a result of the whole body vibrations induced by automobiles. This paper is concerned with the enhancement and optimization of suspension performance by using factorial methods of Design of Experiments, a nonderivative method. It focuses on the optimization of ride comfort and determining the parameters which affect the suspension behavior significantly as per the guidelines stated in ISO 2631-1:1997 standards. A quarter car test rig integrated with a LabVIEW based data acquisition system was developed to understand the real time behavior of a vehicle. In the pilot experiment, only three primary suspension parameters, that is, spring-stiffness, damping, and sprung mass, were considered and the full factorial method was implemented for the purpose of optimization. But the regression analysis of the data obtained rendered a very low goodness of fit which indicated that other parameters are likely to influence the response. Subsequently, steering geometry angles, camber and toe and tire pressure, were included in the design. Fractional factorial method with six factors was implemented to optimize ride comfort. The resultant optimum combination was then verified on the test rig with high correlation.

No Brasil, ainda são poucos os estudos que quantificam os níveis de exposição à vibração mecânica de corpo inteiro com máquinas florestais. Este estudo foi realizado na região de Campinas, em áreas de colheita de eucalipto de uma empresa de celulose e papel, objetivando quantificar os níveis de vibração aleatória a que estão expostos os operadores de três tipos de máquina de colheita de madeira - Feller-Buncher, Skidder e Garra Traçadora - durante a jornada de trabalho. Foi utilizado um medidor integrador triaxial Larson Davis modelo HVM 100 e os resultados analisados de acordo com as recomendações das normas ISO 2631-1: 1997 (no critério saúde) e Diretiva 2002/44 da Comunidade Européia. O Feller-Buncher apresentou uma magnitude de vibração equivalente de 1,12 m.s-2 (soma ponderada dos valores encontrados nos três eixos) sendo que, segundo a metodologia de Griffin (1998), o tempo máximo de exposição recomendado deveria ser de 4h47 min. O Skidder apresentou uma magnitude de vibração equivalente de 1,95 m.s-2, onde, de acordo com a mesma metodologia, o tempo de exposição máxima não deveria ultrapassar 1h35min. A Garra Traçadora apresentou os níveis mais próximos e dentro das recomendações das referidas normas: 0,99 m.s-2. Apesar de toda tecnologia empregada pelos fabricantes de máquinas de colheita florestal, os níveis de exposição às vibrações ainda estão além dos parâmetros recomendados pelas normas pertinentes.

Exposure to whole-body vibration (1-80 Hz) manifest in higher incidences of low back pain and other musculoskeletal disorders among the workforce in mining industry. The aim of the study was to determine the vibration intensity of twelve mining equipments which are regularly deployed in an underground mine and to evaluate the long term health risk of their operators as per ISO 2631-1:1997 guidelines. It was observed that the low profile dump trucks (LPDT) and load haul dumpers (LHD) had x axis (front-back) as dominant axis of vibration. The operators of LPDTs and LHDs had moderate health risk considering frequency weighted root mean square (r.m.s.) acceleration values of vibration (0.46 – 1.01 m/s2) and corresponding daily exposure of about 6 hours in a shift. Operators of three equipments i.e. water sprinkler, utility vehicle and backfill material carrier had high health risk with z (vertical) as dominant axis of vibration. RMS acceleration values were comparatively high (1.30- 1.96 m/s2) even though their duration of exposure was less (2.5-5.0 hours). Motor grader operator had minimal health risk from vibration exposure while rest two operators of explosive and personnel carrier had moderate health risk. Additional assessment of health risk was carried out using total vibration dose values wherever applicable. High health risks were attributed to fast and harsh driving, poor seat condition and absence of independent seat suspension. Besides technical and operational modifications, training programs should be organised to improve the awareness of this hazard among miners in India.

In order to study the driving comfort and influencing factors when vehicles pass over manholes and pavement around manholes on an urban road, the deformation and vibration of the manhole cover were considered, a multidegree of freedom vibration model of the human-vehicle-manhole cover was established, and the variation characteristics of driving acceleration was analyzed. The root mean square of weighted acceleration was taken as the basic index, and driving comfort was evaluated based on ISO 2631-1-1997 standard. After that, 9 influencing factors were analyzed, such as driving speed, subsidence of manhole, manhole cover stiffness, and longitudinal slope. Then, grey correlation entropy analysis was used to evaluate the influencing factors, and the main factors were determined. The results showed that the maximum acceleration was 3.6 m/s2 when a vehicle was passing over a manhole cover under the basic parameters. At the same time, the root mean square of weighted acceleration was 0.975 m/s2 and driving comfort degree was “uncomfortable.” Driving direction and vibration of the manhole cover had little influence on driving comfort, while the remaining influencing factors had significant influence on that. The ranking of key influence factors on driving comfort was longitudinal slope, driving speed, height difference caused by pavement damage, height difference caused by manhole cover subsidence, tire stiffness, manhole stiffness, and tire damping. Therefore, in order to ensure driving comfort and safety, damage to pavement around manholes and manhole cover subsidence should be repaired in a timely manner.

The paper discusses the main requirements of Russian and foreign regulatory documents on vi-bration protection of the operator's workplace of wheeled and tracked vehicles. Their comparative analysis was performed. The normalization of the parameters of general vibration at the workplaces of operators of tractors and self-propelled agricultural vehicles in our country occurs in accordance with the requirements of SN 2.2.4 / 2.1.8.566-96, GOST 12.1.012-2004 and GOST 12.2.019-2015. The root-mean-square values of vibration accelerations for a certain period of exposure in each oc-tave (one-third octave) frequency band are allocated as the evaluation criteria. They are compared for compliance with the regulated values from a specific standard. At the international level, the ob-ject of compliance is the ISO 2631-1: 1997 standard, which establishes the requirements for vertical and horizontal vibration with a certain exposure time on a person from 1 minute to 24 hours in the frequency range from 1 to 80 Hz. The article shows that the most stringent requirements for the lev-el of local vibration are established in the Russian Federation. They provide clear regulation of the type of work performed, duration, magnitude, direction of existing loads, etc. Relatively soft re-quirements are in most European countries, except Poland, where the MPL is regulated taking into account the age, gender and condition of a person. In addition, in the regulatory documents of most foreign countries there are two and sometimes three indicators: threshold (upper and lower) values and MPL. When the threshold is reached, primary measures are usually initiated to counter harmful factors.

Introduction: The aim of this dissertation is an evaluation of the effect of low frequency vibration on serum lipid profiling women. Materials and Methods: A group of females aged 28-64 years old were assessed twice, before and after 19 days of exposure to low frequency vibration. The parameters of the vibration used (frequency and amplitude) and the short exposition time were selected in order to comply with standards established to safeguard human health; mechanical stimulus safe for human health according to the Polish Standard PN EN ISO 2631-1:1997. The parameters used were as follows: frequency 3.5Hz, amplitude 4 mm and duration time 20 min. The main exclusion criteria for this study were: neoplasm, history of myocardial infarction, history of stroke, history of bone fracture within the two years prior to the study. To assess the effect of low frequency vibration with the parameters as specified above the following physiological and biochemical variables were used: total cholesterol serum level, high density lipoprotein (HDL) cholesterol serum level, low density lipoprotein (LDL) cholesterol serum level, triglycerides (TGD) serum level. Biochemical blood parameters were assessed before and after the trial. Friedawald’s formula was used for the assessment of LDL cholesterol serum level. Upon completion of the study and the subsequent analysis of the results obtained the following conclusions were formulated. Results: A statistically significant lowering of total serum cholesterol and LDL serum cholesterol was observed. Conclusions: The use of the vibration platform with the operational parameters specified had a beneficial effect on the variables measured.

Taxi drivers are daily exposed to frequent and prolonged whole-body vibration. This can cause complications such as back pain among them. Since the vibration level depends on many factors, the present study was performed to model the impact of vehicle speed on the attributes of whole-body vibration among the Peugeot 405 taxi drivers. In this experimental study, the whole-body vibration was measured while other variables including tire pressure, engine speed, road gradient, number of passengers, and type of tire, springs, and shock absorbers had been fixed. The measurements were done according to ISO2631–1 at different speeds of 20, 40, 60, and 80 km/h. Increasing the vehicle speed caused an increase in the average value of vibration attributes including Z-axis (vertical) r.m.s. acceleration, 8-h equivalent acceleration, vibration dose value (m/s1.75), and crest factor (P < 0.05). At the speed of 80 km/h, the average vibration dose value (17.6 m/s1.75) exceeded the upper limit of the ISO 2631–1:1997 health caution zone (>17). Further, 8-h equivalent acceleration, at the speeds of 60 and 80 km/h, was beyond the upper limit (>0.9 m/s2). According to the crest factor, increasing speed would cause greater vibration peaks along the Z-axis (worst-case axis). The amount of whole-body vibration is sensitive to speed changes so that urban taxi drivers who are usually driving at low speeds for inner-city transits will be exposed to a lower average value of whole-body vibration. Due to the evident effect of speed on whole-body vibration attributes, it is strongly recommended to be given full consideration to this factor in preparing vibration control plans for vehicles.

The present investigation attempted to study the overall daily vibration exposure A(8) in actual field rotary tillage operation at various ride conditions (i.e. average velocity, draft and average soil tillage depth). Three different levels of each ride condition were chosen to formulate an organised design of experiments by using Taguchi’s approach. The concurrent root mean square (RMS) acceleration values were measured at the tractor platform, seat pan and seat backrest along the three translation axes to determine the A(8). Signal-to-noise ratios (SNRs) were computed and analysed concerning the conducted experiments. Further, the dominant frequencies at each set of experiment were determined by fast fourier transform (FFT) analysis. A linear regression model was developed to predict the output response and further, the ride conditions were optimised by using desirability approach. The overall daily vibration exposure was found between fairly uncomfortable to uncomfortable category (i.e. 0.64 and 0.84 m/s2) as per ISO 2631-1 (1997). Moreover, the exposure levels are beyond the exposure action limit recommended by Directive2002/44/EU. The average velocity and draft effects on the A(8) response were found significant (p≤0.05) with a contribution of 78.38% and 18.54%, respectively. The FFT analysis depicted a range of dominant peaks in the frequency range of 0.8 to 3.7 Hz. However, the exact frequency of the peaks was found to depend on the experimental condition. The prediction model indicates a good correlation between predicted and actual experimental response with an average error of 1.02%. Desirability and Taguchi’s approaches gave identical optimised ride conditions (i.e. 0.6 m/s, 6 kN, and 0.14 m) with the aim of reducing the A(8) value.

Background: Exposure to whole body vibration (WBV) at work and development of musculoskeletal disorders are well linked. Vehicle vibrations are usually perceived to occur in vertical direction and are likely to cause lumbar disorders in operators. Vibration characteristics of the machines need to be studied and compared with work practices which may indicate nature of health risk to operators. This may help in developing specific action plans to control vibration related health risk. Objective: The objectives of the study were, to measure and analyze vibration magnitudes, observe work practices of Loaders and Dozers, evaluate health risk to their operators and to formulate recommendations for control measures. Methods and Material: Frequency weighted Root Mean Square values of acceleration data was collected as per guidelines in ISO 2631-1:1997 using human vibration analyzers. WBV exposure of 40 (Forty) Loader and Dozer operators in eight opencast mines were evaluated to assess health risk using vibration magnitude and corresponding daily exposure durations. Results and Conclusion: The dominant axis of vibration in dozers was found to be X (front to back) in 80% of the equipments. This is different from transporting equipment like Dumpers which have Z axis as dominant axis of vibration. A continuous change of movement in forward and reverse direction and rash driving were found to be contributory factors for increased vibration intensity along X- axis. It was observed that 27(68%) of them showed moderate whereas 12(30%) equipment showed high health risk. It is suggested that vibration control measures should be designed and adopted based not only on the intensity but also on the dominant axis typical to the equipment and work practices.DOI: http://dx.doi.org/10.3126/ijosh.v2i2.6144 International Journal of Occupational Safety and Health, Vol 2. No 2 (2012) 3-7

The aim of this article is to compare Vibration and Noise measurements caused by different types of Machines at cement factories with the standard evaluation criteria of Vibration ISO 2631 – 4 EVS – EN 5349 – 2 and Noise following the standard ISO 9612 – 2009. Two cement companies were chosen, the first is located at Baddish district, 30km west of Mosul city (Iraq), which is called Baddish general cement company, while the other is located south of Mosul, and is called Hammam Al-Alil general cement company. Three stations were chosen for each company (raw materials grinding mills, cement grinding mills, and exhaust fan stations) having different electrical motor capacities. Noise level meter and vibration level meter manufactured by B & K (DENEMARK) were used for measurement. The location of bearing was chosen for vibration measurement, while the location of the operator’s ears for noise measurement, where chosen. It was found that most of the readings in vibration levels were unacceptable according to the evaluation criterion of vibration magnitude and noise level higher than 85dBA due to rotating unbalance misalignment and faulty gear matching (ISO 1940/1, 1990).

This article aims to discuss the production of knowledge in the academic-scientific field within the scope of the new university that exists in the XXI century in which the production of raw material knowledge is privileged, focused on the interests of the market. It is a bibliographical research, based on Pierre Bourdieu’s theoretical concepts, which help in the comprehension of the characteristics of the scientific field, marked by the dialectical pair knowledge and interest (illusio), highlighting the particularities of the production of knowledge centered on productivism and supported by the idea of meritocracy, structuring element of the academic-scientific field. It is understood that all social fields undergo resignifications, transformations or changes according to the historical context in which they are inserted and, in this regard, in the field of the research and the production of scientific knowledge there are, beyond the productivism, the competitive struggle for prestige and power, attitudes, actions and collaborative practices between the researchers. In conclusion, the understanding of the intrinsic and extrinsic characteristics of the scientific field, revealing the relations of power and domination that engender the production of knowledge, can expand the possibilities of constitution of a new emancipatory education project for human beings, contributing to the overcoming of the current productive and meritocratic professional habitus that conforms the illusio of researchers and students in the academic field.ResumoEste artigo visa problematizar a produção do conhecimento no campo acadêmico-científico, no âmbito da nova universidade que se configura no século XXI, em que se privilegia a produção do conhecimento matéria-prima, voltado para os interesses do mercado. Trata-se de pesquisa bibliográfica, fundamentada em conceitos teóricos de Pierre Bour­dieu, que auxiliam na compreensão das características do campo científico, marcado pelo par dialético conhecimento e interesse (illusio), evidenciando as particularidades da produção do conhecimento centrado no produtivismo e respaldado pela ideia de meritocracia, elemento estruturante do campo acadêmico-científico. Entende-se que todos os campos sociais passam por ressignificações, transformações ou mudanças de acordo com o contexto histórico em que estão inseridos e que, nesse sentido, no campo da pesquisa e da produção do conhecimento científico existem, para além do produtivismo e da luta concorrencial por prestígio e poder, atitudes, ações e práticas colaborativas entre os pesquisadores. Conclui-se que a compreensão das características intrínsecas e extrínsecas do campo científico, desvelando as relações de poder e dominação que engendram a produção do conhecimento, possa ampliar as possibilidades de constituição de um novo projeto de educação emancipatória para os seres humanos, contribuindo para a superação do atual habitus pro­fissional produtivista e meritocrático que conforma a illusio de pesquisadores e estudantes no campo acadêmico.ResumenEste artículo tiene por objeto problematizar la producción del conocimiento en el campo académico-científico en el ámbito de la nueva universidad que se configura en el siglo XXI en que se privilegia la producción del conocimiento materia prima, orientado hacia los intereses del mercado. Se trata de una investigación bibliográfica, fundamentada en conceptos teóricos de Pierre Bourdieu, que auxilian en la comprensión de las características del campo científico, marcado por el par dialéctico conocimiento e interés (illusio), evidenciando las particularidades de la producción del conocimiento centrado en el productivismo y respaldado por la idea de meritocracia, elemento estructurante del campo académico-científico. Se entiende que todos los campos sociales pasan por resignificaciones, transformaciones o cambios de acuerdo con el contexto histórico en que están insertos y que, en ese sentido, en el campo de la investigación y de la producción del conocimiento científico existen, además del productivismo, de la lucha competitiva por prestigio y poder, actitudes, acciones y prácticas colaborativas entre los investigadores. 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SYNOPSIS Whole-body vibration (WBV) exposure measurements taken from 105 truck drivers employed in 19 mines and other workplaces were evaluated with the criteria prescribed in EU 2002/44/EC directive, BS 6841 (1987), ISO 2631-1 (1997). and ISO 2631-5 (2004) standards. The highest vibration acceleration was measured on the vertical Z-axis. The highest WBV exposure occurred in the RETURN, HAUL, and SPOT phases while the lowest exposure took place in the LOAD and WAIT phases. Crest factors on all axes were generally greater than nine, yet strong correlation coefficients were achieved in VDV-eVDV analyses. Driver seats generally dampened the vibration along the Z-axis but exacerbated it along X and Y axes. The dominant frequency for the X and Y-axes rose up to 40 Hz while it ranged between 1 Hz and 2.5 Hz along the Z-axis. While the probability of an adverse health effect was higher with BS 6841 (1987) and ISO 2631-1 (1997) standards, it was low according to EU 2002/44/EC and ISO 2631-5 (2004). The 91 t, 100 t, and 170 t capacity trucks produced lower vibration magnitudes. Drivers were exposed to approximately equivalent levels of WBV acceleration and dose in contractor-type trucks and mining trucks. Rear-dump trucks exposed their drivers to a slightly higher level of vibration than bottom-dump trucks. Underground trucks exposed their drivers to a significantly higher level of vibration than mining trucks. Both driver age and driver experience were inversely proportional to vibration acceleration and dose. Conversely, there was a positive relationship between the truck service years and the WBV acceleration and dose to which drivers were exposed to. Loads of blocky material exposed drivers to higher vibration acceleration and dose levels than non-blocky material. Keywords: whole-body vibration, mining truck, A(8), BS 6841, EU 2002/EC/44, ISO 2631-1, ISO 2631-5, VDV(8).

The aim of this work is to simulate reduction of whole-body vibration represented by acceleration that is transmitted through seat to the driver in a passenger car by studying different cushion materials for the seat. The accelerations at the interface of driver and seat are studied for an exposure period of eight hours as per ISO 2631-1(1997) standards. The entire study is done using FEA analysis in ANSYS 19.2. The simulation has been carried out for three different base accelerations representing three different road conditions and also for three different weights of drivers which are assigned to the manikin model sitting on the seat. Two cushion materials namely melamine foam and rebonded foam, in addition to regufoam which is commonly used in the cars have been taken up for study. For 65 kgf, 75 kgf and 85 kgf driver weights, rebonded foam results in an average A(8) reduction by 13.8%, 19.48% and 30.34% respectively whereas melamine foam has reduced it by 5.19%, 5.80% and 14.54% respectively for the same conditions. It is therefore suggested that rebonded foam gives better comfort compared to the existing regufoam and melamine for seat cushioning of the car studied.

To correctly evaluate the vibration transmitted to the operators, it is necessary to consider each body’s point interested by the vibratory stimulus produced by machines. All the body’s part in contact to the vibration, when a portable device with internal combustion engine is used, are: hands, back and shoulders. Some information for wholebody vibration are available in the ISO 2631-1997 standard, which otherwise refers to a seated operator. ‘C’ type standards for the vibration analysis exist for some portable machines with an internal combustion engine which is comprehensive in the machine (chainsaw, brush-cutter, blower). If the engine is not inside the machine, but it is on the operator’s back, ‘C’ type standards on vibration measurements are quite incomplete. The IMAMOTER institute of CNR, the DISAFA Department (University of Turin) and the Occupational Medicine Department of the University of Catania started some tests to verify the vibration levels transmitted to an operator working with backed engine devices. Two machines have been examined: a blower and a spraying machine. Two operative conditions have been considered during all the tests: idling and full load. Three operators have been involved and each test has been repeated three times. The spraying machine has been tested both with the empty tank and with 10 litres of water, to simulate the load to be caused by the presence of liquid inside the tank. In this work the comfort condition of ISO 2631-1 standard was considered, using the frequency weighting Wc curve with the weighting factor 0.8 for X axis (back-ventral direction) and the Wd curve for Y and Z axis (shoulder - shoulder and buttocks - head) with weighting factors 0.5 and 0.4 (respectively for Y and Z axis). Data were examined using IBM SPSS Statistics 20 software package. The statistical analysis underlined that the running condition is the main factor to condition the vibration levels transmitted to the operator’s back, while the ballast and the operators are influent when the running conditions are distinguished. Concerning medical investigation, lower back and shoulders are the main critical part of the body interested by vibration transmitted to each operator.

Os efeitos da vibração sobre o corpo humano são analisados há muito tempo com o objetivo de evitar os efeitos indesejáveis e até prejudiciais à saúde, como por exemplo, vertigens ou enjoos causados por movimentos oscilatórios. Além disso, a competitividade na indústria automobilística, onde não só o preço é responsável pela escolha de um determinado modelo, faz com que o consumidor avalie diversos outros aspectos para decidir qual veículo irá comprar. Dentre esses aspectos, o conforto pode ser um fator decisivo nesta escolha, principalmente em função do péssimo estado das rodovias brasileiras. Essa diferença na qualidade das pistas de rolagem no Brasil é tanta que alguns parâmetros das suspensões de um veículo produzido mundialmente possuem valores especialmente adaptados para as estradas brasileiras. O presente artigo tratará de um modelo automotivo bidimensional, com e sem motorista (três e dois graus de liberdade, respectivamente) para um carro de passeio. A partir da modelagem matemática deste automóvel, serão realizadas simulações aplicando as equações que regem o sistema proposto, comparando os resultados com norma padrão que trata do assunto - ISO 2631-1:1997 - e fazendo alterações nos parâmetros a fim de entender sua influência sobre a resposta obtida e, portanto, sobre o conforto do condutor.

My thesis is that new media, starting with analog broadcast and going through digital convergence, blur the line between work time and free time. The technology that we are adopting has transformed free time into potential and actual labour time. At the dawn of the modern age, work shifted from tasked time to measured time. Previously, tasked time intermingled work and leisure according to the vagaries of nature. All this was banished when industrial capitalism instituted the work clock (Mumford 12-8). But now, many have noticed how post-industrial capitalism features a new intermingling captured in such expressions as "24/7" and "multi-tasking." Yet, we are only beginning to understand that media are driving a return to the pre-modern where the hour and the space are both ambiguous, available for either work or leisure. This may be the unfortunate side effect of the much vaunted "interactivity." Do you remember the old American TV show Dobie Gillis (1959-63) which featured the character Maynard G. Krebs? He always shuddered at the mention of the four-letter word "work." Now, American television shows makes it a point that everyone works (even if just barely). Seinfeld was a bold exception in featuring the work-free Kramer; a deliberate homage to the 1940s team of Abbott and Costello. Today, as welfare is turned into workfare, The New York Times scolds even the idle rich to adopt the work ethic (Yazigi). The Forms of Broadcast and Digital Media Are Driving the Merger of Work and Leisure More than the Content It is not just the content of television and other media that is undermining the leisured life; it is the social structure within which we use the media. Broadcast advertisements were the first mode/media combinations that began to recolonise free time for the new consumer economy. There had been a previous buildup in the volume and the ubiquity of advertising particularly in billboards and print. However, the attention of the reader to the printed commercial message could not be controlled and measured. Radio was the first to appropriate and measure its audience's time for the purposes of advertising. Nineteenth century media had promoted a middle class lifestyle based on spending money on home to create a refuge from work. Twentieth century broadcasting was now planting commercial messages within that refuge in the sacred moments of repose. Subsequent to broadcast, home video and cable facilitated flexible work by offering entertainment on a 24 hour basis. Finally, the computer, which juxtaposes image/sound/text within a single machine, offers the user the same proto-interactive blend of entertainment and commercial messages that broadcasting pioneered. It also fulfills the earlier promise of interactive TV by allowing us to work and to shop, in all parts of the day and night. We need to theorise this movement. The theory of media as work needs an institutional perspective. Therefore, I begin with Dallas Smythe's blindspot argument, which gave scholarly gravitas to the structural relationship of work and media (263-299). Horkheimer and Adorno had already noticed that capitalism was extending work into free time (137). Dallas Smythe went on to dissect the precise means by which late capitalism was extending work. Smythe restates the Marxist definition of capitalist labour as that human activity which creates exchange value. Then he considered the advertising industry, which currently approaches200 billion in the USA and realised that a great deal of exchange value has been created. The audience is one element of the labour that creates this exchange value. The appropriation of people's time creates advertising value. The time we spend listening to commercials on radio or viewing them on TV can be measured and is the unit of production for the value of advertising. Our viewing time ipso facto has been changed into work time. We may not experience it subjectively as work time although pundits such as Marie Winn and Jerry Mander suggest that TV viewing contributes to the same physical stresses as actual work. Nonetheless, Smythe sees commercial broadcasting as expanding the realm of capitalism into time that was otherwise set aside for private uses. Smythe's essay created a certain degree of excitement among political economists of media. Sut Jhally used Smythe to explain aspects of US broadcast history such as the innovations of William Paley in creating the CBS network (Jhally 70-9). In 1927, as Paley contemplated winning market share from his rival NBC, he realised that selling audience time was far more profitable than selling programs. Therefore, he paid affiliated stations to air his network's programs while NBC was still charging them for the privilege. It was more lucrative to Paley to turn around and sell the stations' guaranteed time to advertisers, than to collect direct payments for supplying programs. NBC switched to his business model within a year. Smythe/Jhally's model explains the superiority of Paley's model and is a historical proof of Smythe's thesis. Nonetheless, many economists and media theorists have responded with a "so what?" to Smythe's thesis that watching TV as work. Everyone knows that the basis of network television is the sale of "eyeballs" to the advertisers. However, Smythe's thesis remains suggestive. Perhaps he arrived at it after working at the U.S. Federal Communications Commission from 1943 to 1948 (Smythe 2). He was part of a team that made one last futile attempt to force radio to embrace public interest programming. This effort failed because the tide of consumerism was too strong. Radio and television were the leading edge of recapturing the home for work, setting the stage for the Internet and a postmodern replication of the cottage industries of pre and proto-industrial worlds. The consequences have been immense. The Depression and the crisis of over-production Cultural studies recognises that social values have shifted from production to consumption (Lash and Urry). The shift has a crystallising moment in the Great Depression of 1929 through 1940. One proposal at the time was to reduce individual work hours in order to create more jobs (see Hunnicut). This proposal of "share the work" was not adopted. From the point of view of the producer, sharing the work would make little difference to productivity. However, from the retailer's perspective each individual worker would accumulate less money to buy products. Overall sales would stagnate or decline. Prominent American economists at the time argued that sharing the work would mean sharing the unemployment. They warned the US government this was a fundamental threat to an economy based on consumption. Only a fully employed laborer could have enough money to buy down the national inventory. In 1932, N. A. Weston told the American Economic Association that: " ...[the labourers'] function in society as a consumer is of equal importance as the part he plays as a producer." (Weston 11). If the defeat of the share the work movement is the negative manifestation of consumerism, then the invasion by broadcast of our leisure time is its positive materialisation. We can trace this understanding by looking at Herbert Hoover. When he was the Secretary of Commerce in 1924 he warned station executives that: "I have never believed that it was possible to advertise through broadcasting without ruining the [radio] industry" (Radio's Big Issue). He had not recognised that broadcast advertising would be qualitatively more powerful for the economy than print advertising. By 1929, Hoover, now President Hoover, approved an economics committee recommendation in the traumatic year of 1929 that leisure time be made "consumable " (Committee on Recent Economic Changes xvi). His administration supported the growth of commercial radio because broadcasting was a new efficient answer to the economists' question of how to motivate consumption. Not so coincidentally network radio became a profitable industry during the great Depression. The economic power that pre-war radio hinted at flourished in the proliferation of post-war television. Advertisers switched their dollars from magazines to TV, causing the demise of such general interest magazines as Life, The Saturday Evening Postet al. Western Europe quickly followed the American broadcasting model. Great Britain was the first, allowing television to advertise the consumer revolution in 1955. Japan and many others started to permit advertising on television. During the era of television, the nature of work changed from manufacturing to servicing (Preston 148-9). Two working parents also became the norm as a greater percentage of the population took salaried employment, mostly women (International Labour Office). Many of the service jobs are to monitor the new global division of labour that allows industrialised nations to consume while emerging nations produce. (Chapter seven of Preston is the most current discussion of the shift of jobs within information economies and between industrialised and emerging nations.) Flexible Time/ Flexible Media Film and television has responded by depicting these shifts. The Mary Tyler Moore Show debuted in September of 1970 (see http://www.transparencynow.com/mary.htm). In this show nurturing and emotional attachments were centered in the work place, not in an actual biological family. It started a trend that continues to this day. However, media representations of the changing nature of work are merely symptomatic of the relationship between media and work. Broadcast advertising has a more causal relationship. As people worked more to buy more, they found that they wanted time-saving media. It is in this time period that the Internet started (1968), that the video cassette recorder was introduced (1975) and that the cable industry grew. Each of these ultimately enhanced the flexibility of work time. The VCR allowed time shifting programs. This is the media answer to the work concept of flexible time. The tired worker can now see her/his favourite TV show according to his/her own flex schedule (Wasser 2001). Cable programming, with its repeats and staggered starting times, also accommodates the new 24/7 work day. These machines, offering greater choice of programming and scheduling, are the first prototypes of interactivity. The Internet goes further in expanding flexible time by adding actual shopping to the vicarious enjoyment of consumerist products on television. The Internet user continues to perform the labour of watching advertising and, in addition, now has the opportunity to do actual work tasks at any time of the day or night. The computer enters the home as an all-purpose machine. Its purchase is motivated by several simultaneous factors. The rhetoric often stresses the recreational and work aspects of the computer in the same breath (Reed 173, Friedrich 16-7). Games drove the early computer programmers to find more "user-friendly" interfaces in order to entice young consumers. Entertainment continues to be the main driving force behind visual and audio improvements. This has been true ever since the introduction of the Apple II, Radio Shack's TRS 80 and Atari 400 personal computers in the 1977-1978 time frame (see http://www.atari-history.com/computers/8bits/400.html). The current ubiquity of colour monitors, and the standard package of speakers with PC computers are strong indications that entertainment and leisure pursuits continue to drive the marketing of computers. However, once the computer is in place in the study or bedroom, its uses fully integrates the user with world of work in both the sense of consuming and creating value. This is a specific instance of what Philip Graham calls the analytical convergence of production, consumption and circulation in hypercapitalism. The streaming video and audio not only captures the action of the game, they lend sensual appeal to the banner advertising and the power point downloads from work. In one regard, the advent of Internet advertising is a regression to the pre-broadcast era. The passive web site ad runs the same risk of being ignored as does print advertising. The measure of a successful web ad is interactivity that most often necessitates a click through on the part of the viewer. Ads often show up on separate windows that necessitate a click from the viewer if only to close down the program. In the words of Bolter and Grusin, click-through advertising is a hypermediation of television. In other words, it makes apparent the transparent relationship television forged between work and leisure. We do not sit passively through Internet advertising, we click to either eliminate them or to go on and buy the advertised products. Just as broadcasting facilitated consumable leisure, new media combines consumable leisure with flexible portable work. The new media landscape has had consequences, although the price of consumable leisure took awhile to become visible. The average work week declined from 1945 to 1982. After that point in the US, it has been edging up, continuously (United States Bureau of Labor Statistics). There is some question whether the computer has improved productivity (Kim), there is little question that the computer is colonising leisure time for multi-tasking. In a population that goes online from home almost twice as much as those who go online from work, almost half use their online time for work based activities other than email. Undoubtedly, email activity would account for even more work time (Horrigan). On the other side of the blur between work and leisure, the Pew Institute estimates that fifty percent use work Internet time for personal pleasure ("Wired Workers"). Media theory has to reengage the problem that Horkheimer/Adorno/Smythe raised. The contemporary problem of leisure is not so much the lack of leisure, but its fractured, non-contemplative, unfulfilling nature. 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Links http://www.pewinternet.org/reports/toc.asp?Report=20 http://www.pewinternet.org/reports/toc.asp?Report=22 http://www.atari-history.com/computers/8bits/400.html http://www.transparencynow.com/mary.htm http://www.digitaleconomy.gov/powerpoint/triplett/index.htm http://links.jstor.org/sici?sici=0002-8282%28193203%2922%3C8%3ASWTAU%3 E2.0.CO%3B2-3 Citation reference for this article MLA Style Wasser, Frederick. "Media Is Driving Work" M/C: A Journal of Media and Culture 4.5 (2001). [your date of access] < http://www.media-culture.org.au/0111/Wasser.xml >. Chicago Style Wasser, Frederick, "Media Is Driving Work" M/C: A Journal of Media and Culture 4, no. 5 (2001), < http://www.media-culture.org.au/0111/Wasser.xml > ([your date of access]). APA Style Wasser, Frederick. (2001) Media Is Driving Work. M/C: A Journal of Media and Culture 4(5). < http://www.media-culture.org.au/0111/Wasser.xml > ([your date of access]).