Correlation between weighted acceleration, vibration dose value and exposure time on whole body vibration comfort levels evaluation

Duarte, Maria Lúcia Machado; Araújo, Priscila Albuquerque de; Horta, Frederico C.; Vecchio, Sara Del; Carvalho, L.A.P. de

doi:10.1016/j.ssci.2017.11.008

Cited by 39 publications

(15 citation statements)

References 12 publications

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“…Vibration occurs when the body is exposed to internal or external forces. Physical factors such as noise, heat, vibration, and radiation are environmental stressors with many stimuli that are detrimental to health and can alter bodily functions [ 45 ]. Vibrations can be harmful to human health, depending on the intensity and duration of exposure.…”

Section: Methodsmentioning

confidence: 99%

“…The ISO (International Standards Organization) 2631-1 developed in 1997 [ 46 ] provides guidance on the use of methods to assess human exposure to vibration. For this purpose, frequency weighting and magnification of each evaluation axis are applied, as human response to vibration and its effects depend on the frequency of the vibration, its direction, and the studied effect (health, comfort, task) [ 45 - 47 ].…”

Section: Methodsmentioning

confidence: 99%

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Psychological Effects of Heart Rate and Physical Vibration on the Operation of Construction Machines: Experimental Study

Hashiguchi

Cao

Lim

et al. 2021

JMIR Mhealth Uhealth

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Background A construction method has emerged in which a camera is installed around a construction machine, and the operator remotely controls the machine while synchronizing the vibration of the machine with the images seen from the operator's seat using virtual reality (VR) technology. Indices related to changes in heart rate (HR) and physical vibration, such as heart rate variability (HRV) and multiscale entropy (MSE), can then be measured among the operators. As these indices are quantitative measures of autonomic regulation in the cardiovascular system, they can provide a useful means of assessing operational stress. Objective In this study, we aimed to evaluate changes in HR and body vibration of machine operators and investigate appropriate methods of machine operation while considering the psychological load. Methods We enrolled 9 remote operators (18-50 years old) in the experiment, which involved 42 measurements. A construction machine was driven on a test course simulating a construction site, and three patterns of operation—riding operation, remote operation using monitor images, and VR operation combining monitor images and machine vibration—were compared. The heartbeat, body vibration, and driving time of the participants were measured using sensing wear made of a woven film-like conductive material and a three-axis acceleration measurement device (WHS-2). We used HRV analysis in the time and frequency domains, MSE analysis as a measure of the complexity of heart rate changes, and the ISO (International Standards Organization) 2631 vibration index. Multiple regression analysis was conducted to model the relationship among the low frequency (LF)/high frequency (HF) HRV, MSE, vibration index, and driving time of construction equipment. Efficiency in driving time was investigated with a focus on stress reduction. Results Multiple comparisons conducted via the Bonferroni test and Kruskal-Wallis test showed statistically significant differences (P=.05) in HRV-LF/HF, the vibration index, weighted acceleration, motion sickness dose value (MSDVz), and the driving time among the three operation patterns. The riding operation was found to reduce the driving time of the machine, but the operation stress was the highest in this case; operation based on the monitor image was found to have the lowest operation stress but the longest operation time. Multiple regression analysis showed that the explanatory variables (LH/HF), RR interval, and vibration index (MSDVz by vertical oscillation at 0.5-5 Hz) had a negative effect on the driving time (adjusted coefficient of determination R2=0.449). Conclusions A new method was developed to calculate the appropriate operating time by considering operational stress and suppressing the physical vibration within an acceptable range. By focusing on the relationship between psychological load and physical vibration, which has not been explored in previous studies, the relationship of these variables with the driving time of construction machines was clarified.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Psychological Effects of Heart Rate and Physical Vibration on the Operation of Construction Machines: Experimental Study

Hashiguchi

Cao

Lim

et al. 2021

JMIR Mhealth Uhealth

View full text Add to dashboard Cite

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“…To analyse the ride comfort of the passenger, FWRMS values and vibration dose value (VDV) [27] are computed and it is tabulated in Tables 2, 3 and 4. As per ISO-2631 [27], the proposed FOSMC enhances ride comfort to NU level for step input, FU level for RR and LU level for SR input which is noted from the Tables 2, 3 and 4. The FWRMS and vibration dose value (VDV) may cause discomfort for the passengers.…”

Section: Ride Comfort Analysismentioning

confidence: 99%

“…The unit of VDV is taken from safety sciences. The ISO2631-1 Standard uses the exposure duration and Vibration Dose Values (VDV) to calculate the equivalence, being those terms a power of 2 or 4, respectively, in the equivalence formula [27]. It is evaluated for step, RR and SR input.…”

Section: Ride Comfort Analysismentioning

confidence: 99%

Simulation study on ride comfort enhancement for a heavy duty vehicle with fractional order sliding mode controller

Yuvapriya

Lakshmi

2020

SN Appl. Sci.

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The main goal of vehicle active suspension system is to upgrade the ride quality and stability of heavy duty vehicle (HDV) regardless of road surface. The mathematical modelling of HDV with two degrees of freedom is developed and simulated in MATLAB/Simulink environment. The simple and effective control techniques such as proportional integral and derivative (PID) controller, sliding mode controller (SMC) and fractional order sliding mode controller (FOSMC) are designed to detach the vibration from the passenger under step, sinusoidal and random road profile. Literature reveals that the FOSMC can eliminate steady state error and chattering effect unlike SMC and PID. The dynamic analysis of designed controllers is examined in terms of time domain, frequency domain and ride comfort analysis as per ISO 2631. The stability of SMC and FOSMC is confirmed by Lyapunouv stability for three different road profiles. The FOSMC shows satisfactory simulation results than SMC, PID and passive suspension system in reducing suspension deflection and body acceleration of HDV to upgrade the ride quality. Further, the efficacy of proposed FOSMC is proved by comparing the simulation results against existing results of PID controller.

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“…However, for generalized vibration transfer paths with multiple vibration subpaths, fuzzy point data processing analysis is more helpful to avoid the signal processing of vibration source data. Based on the vibration measurement standard ISO 2613-1:1997(E), the vibration acceleration time domain signal, a t , n the recorded acceleration time, T , was weighted using a certain frequency weighting function, w(f ), and the corresponding root-mean-square value of the weighted acceleration was calculated as a i , based on the vibration signal in a particular i direction, which is expressed as follows [20], [21]:…”

Section: A Identification Of Vibration Path and Layout Adjustment Ofmentioning

confidence: 99%

A Multi-Point Iterative Analysis Method for Vibration Control of a Steering Wheel at Idle Speed

Tang

et al. 2019

IEEE Access

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Steering wheel vibration control is of great significance to improve the ride comfort of vehicles. However, the coupling effect of the multi-source vibration transfer path makes it difficult to screen out the abnormal vibration transfer intervals. Therefore, a multi-point iterative analysis method (MIAM) is presented in this paper. In addition, this paper researches the characteristics of the main vibration transmission path of a truck and proposes a new vibration isolation structure. Considering the structural characteristics of the modal deformation of the car body, the installation orientation of the measuring point is further adjusted according to the area formed by modal deformation nodes, and a simplified vibration transfer path is presented. After weighing the vibration data of the sensor and considering the vibration transfer rate as the analysis index, the abnormal interval of vibration transmission on the main path was detected. The effectiveness of the improved structure is verified with the modal verification analysis of an extracted steering system model. In addition, the experimental results show that the improved measures reduce the total vibration of the steering wheel by 34% and offsets the peak corresponding frequency by 4.8%, showing the effectiveness of the proposed method and proving its advantages for other vibration control problems.INDEX TERMS MIAM, extracted steering system model, new vibration isolation structure, simplified vibration transfer path, modal verification analysis.

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Correlation between weighted acceleration, vibration dose value and exposure time on whole body vibration comfort levels evaluation

Cited by 39 publications

References 12 publications

Psychological Effects of Heart Rate and Physical Vibration on the Operation of Construction Machines: Experimental Study

Psychological Effects of Heart Rate and Physical Vibration on the Operation of Construction Machines: Experimental Study

Simulation study on ride comfort enhancement for a heavy duty vehicle with fractional order sliding mode controller

A Multi-Point Iterative Analysis Method for Vibration Control of a Steering Wheel at Idle Speed

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