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Paul-Émile Boileau

Paul-Émile Boileau
McGill University | McGill · Department of Epidemiology, Biostatistics and Occupational Health

PhD

About

79
Publications
12,486
Reads
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2,241
Citations
Citations since 2016
12 Research Items
1007 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Introduction
Additional affiliations
October 1984 - present

Publications

Publications (79)
Article
Full-text available
In this study, the vibration total value of the acceleration transmitted to the wrist and elbow was measured in the laboratory with a group of 13 male subjects holding a cylindrical handle while modifying the coupling force under varying levels of vibration. The results were used to establish the relationship between hand-transmitted vibration and...
Article
Full-text available
Objectives To study the characteristics and the factors influencing the occurrence of the Hand-Arm Vibration Syndrome (HAVS) for a population grinding handheld workpieces in a subtropical environment. MethodsA total of 803 workers grinding handheld workpieces formed the exposure group and 464 workers not exposed to hand-transmitted vibration (HTV)...
Article
Background: The vascular component of the hand-arm-vibration syndrome (HAVs) is often characterized by vibration-induced white fingers (VWF). Active substances secreted by the vascular endothelial cells (VEC) maintain a dynamic balance but damage to the blood vessels may occur when the equilibrium is altered, thus forming an important pathological...
Article
The nonlinear stiffness and damping properties of a simple and low-cost design of a hydro-pneumatic suspension (HPS) strut that permits entrapment of gas into the hydraulic oil are characterized experimentally and analytically. The formulation of gas-oil emulsion is studied in the laboratory, and the variations in the bulk modulus and mass density...
Article
Full-text available
This study investigates the coupled ride and directional performance characteristics of an articulated frame-steered vehicle (AFSV). A three-dimensional multi-body dynamic model of the vehicle is formulated integrating the hydro-mechanical frame steering and hydro-pneumatic suspension (HPS) systems. The model parameters are obtained from field-meas...
Article
Full-text available
The articulated frame-steered vehicles (AFSV) exhibit enhanced maneuverability but reduced yaw stability and greater steering power consumption. Apart from kinematics of the steering system, the dynamics of the actuating system strongly influence the performance of the AFSV, which is generally neglected in the reported studies. In this study, a yaw...
Article
The directional performance characteristics of articulated frame steering vehicles are known to be strongly coupled with the kinematic characteristics and the dynamic characteristics of the steering system. The reported studies on articulated frame steering generally focus on the yaw divergence behaviour or the snaking tendency of the vehicle based...
Article
This study is aimed at characterizing the nonlinear stiffness and damping properties of a simple and low cost design of a hydro-pneumatic suspension (HPS) that permits entrapment of gas into the hydraulic fluid. The mixing of gas into the oil yields highly complex variations in the bulk modulus, density and viscosity of the hydraulic fluid, and the...
Article
Full-text available
Over the past decade, encouraging trends have been observed in many parts of the world showing a decrease in the annual number of occupational injury claims, while occupational diseases have been shown to be on the rise and can now be considered as the main cause of death at work. While preventive actions to mitigate the risks have been shown to be...
Article
The roll stability is significant for both road and off-road commercial vehicles, while the majority of reported studies focus on road vehicles neglecting the contributions of uneven off-road terrains. The limited studies on roll stability of off-road vehicles have assessed the stability limits using performance measures derived for road vehicles....
Article
The absorbed power characteristics of seated body exposed to whole-body vibration along the individual and combined fore-aft (x), lateral (y) and vertical (z) axes are investigated through measurements of body-seat interactions at the two driving-points formed by the body and the seat-pan, and upper body and the seat backrest. The experiments invol...
Article
The apparent mass and seat-to-head vibration transmissibility response functions of the seated human body were investigated under whole-body vibration exposures to fore-aft (x), lateral (y), and vertical (z) applied individually and simultaneously. The experiments were performed with 9 adult male subjects to measure the biodynamic responses to sing...
Article
The ride dynamic characteristics of a novel torsio-elastic suspension for off-road vehicle applications are investigated through field measurements and simulations. A prototype suspension was realised and integrated within the rear axle of a forestry skidder for field evaluations. Field measurements were performed on forestry terrains at a constant...
Article
The apparent mass and seat-to-head-transmissibility response functions of the seated human body were investigated under exposures to fore-aft (x), vertical (z), and combined fore-aft and vertical (x and z) axis whole-body vibration. The coupling effects of dual-axis vibration were investigated using two different frequency response function estimat...
Article
Documented whole-body vibration (WBV) exposure levels at the operator/seat interface are limited for underground mining load-haul-dump (LHD) vehicles. Therefore, WBV exposure during the operation of eight small and nine large LHD vehicles, under loaded and empty haulage, was measured in accordance with ISO 2631-1 guidelines. Vibration exposure was...
Article
Identification of most probable ranges of biodynamic responses of the human body exposed to whole-body vibration is essential for developing effective integrated human-machine system design tools, improved vibration mitigation devices and frequency-weighting for exposure assessment. The international standard, ISO-5982 (2001), defines such ranges f...
Article
Full-text available
Trunk biomechanical models play an indispensable role in predicting muscle forces and spinal loads under whole-body vibration (WBV) exposures. Earlier measurements on the force-motion biodynamic response (impedance, apparent mass) at the body-seat interface and vibration transmissibility (seat to head) have led to the development of different mecha...
Article
Full-text available
The apparent mass and seat-to-head-transmissibility response functions of the seated human body are investigated under exposures to fore-aft (x), lateral (y), and combined fore-aft and lateral (x and y) axis whole-body vibration. The experiments were performed to study the effects of hands support, back support and vibration magnitude on the body i...
Article
The ride performance potentials of a prototype torsio-elastic axle suspension for an off-road vehicle were investigated analytically and experimentally. A forestry vehicle was fitted with the prototype suspension at its rear axle to assess its ride performance benefits. Field measurements of ride vibration along the vertical, lateral, fore-aft, rol...
Conference Paper
This study investigated the biodynamic responses of the seated body to two-axis vibration applied along the fore-aft and vertical directions in the 0.5 to 20 Hz range, independently and simultaneously, using 9 adult male subjects. The measurements were performed with the subjects seated with and without the hands and back supports under two differe...
Article
The biodynamic responses of the seated human body exposed to whole-body vibration (WBV) have been mostly studies under single-axis vibration, with the exception of a few recent studies reporting the responses to multi-axis vibration. These studies, however, show negligible coupling effects of simultaneously applied multi-axis vibration on the measu...
Article
The reported driving-point mechanical impedance (DPMI) characteristics of the hand–arm system exposed to vibration show extreme variabilities among them at higher frequencies. The sources of these discrepancies under zh-axis vibration, particularly above 500 Hz, are investigated using experimental and analytical techniques. Four different handle de...
Article
Predicted health risks, associated with the operation of load-haul-dump (LHD) vehicles, based on ISO 2631-1 criteria are limited and have not yet been determined according to ISO 2631-5 criteria. Therefore, health risks predicted by ISO 2631-1 and 2631-5 criteria are reported and compared in this paper. Whole-body vibration (WBV) exposure was measu...
Article
To determine the acute effects of whole-body vibration (WBV) on the sensorimotor system and potentially on the stability of the spine, different biomechanical responses were tested before and after 60 min of sitting, with and without vertical WBV, on four different days. Postures adopted while sitting and the simulated WBV exposure corresponded to...
Article
Full-text available
The “to-the-body” and “through-the-body” biodynamic response functions of the seated human body exposed to vertical vibration are measured and analyzed in an attempt to identify relationships between the apparent mass and seat-to-head transmissibility measures. The experiments involved 12 male subjects exposed to three magnitudes of whole-body vert...
Article
The aptness of two anthropodynamic manikins for assessing vibration isolation effectiveness of suspension seats is evaluated through laboratory measurements. The evaluations were performed using five different suspension seats exposed to idealized white noise (0.5–20 Hz) and target vehicle excitations along the vertical axis using a whole-body vehi...
Article
The biodynamic response of human body seated without a back support and exposed to vertical whole-body vibration have been standardized in ISO 5982 and DIN 45676 in terms of driving-point mechanical impedance and apparent mass. A comparison of ranges defined in two standards, however, reveal considerable differences in both the magnitude and phase....
Article
Full-text available
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 vibration...
Article
The relative interactions of the seated occupants with an inclined backrest were investigated in terms of apparent mass (APMS) responses at the two driving-points formed by the buttock–seat pan and the upper body-backrest under exposure to broad-band and road-measured vertical vibration. The measurements were performed using 24 adult subjects seate...
Article
Full-text available
The seat-to-head transmissibility (STHT) of seated human subjects has been investigated through measurements of vertical seat vibration transmitted to the head in both vertical and fore-and-aft directions. The experiment was performed using 12 adult male subjects exposed to whole-body vertical random vibration in the 0.5-15 Hz frequency range. The...
Article
Full-text available
Laboratory-based whole-body vibration studies often involve complex experimental designs, dozens of vibration exposures and multiple sessions. Shortening the test vibration duration would increase experimental efficiency by permitting more trials in the same time period. This study evaluated reported discomfort based on different sinusoidal vibrati...
Article
The effect of handle size and hand forces, on the power absorbed by the hand–arm system, was investigated in a laboratory study using seven healthy male subjects exposed to two levels of broadband random vibration in the 8–1000 Hz frequency range along the zh-axis. The measurements were performed with three instrumented cylindrical handles of diffe...
Article
Full-text available
The power absorption characteristics of 27 male and female seated subjects, exposed to vertical vibration in the 0.5–40 Hz frequency range, are characterized under different sitting postures. The measurements are performed for a total of 36 different sitting postural configurations realized through variations in hands position (in lap and on steeri...
Article
The influence of hand–arm posture on the biodynamic responses under zh-axis vibration is investigated in terms of driving point mechanical impedance and absorbed power under various combinations of hand grip and push forces, handle sizes and excitation levels. Laboratory measurements of the biodynamic responses were performed on seven healthy male...
Article
Full-text available
The response characteristics of seated human subjects exposed to fore-aft (x-axis) and lateral (y-axis) vibration are investigated through measurements of dynamic interactions between the seated body and the seat pan, and the upper body and the seat backrest. The experiments involved: (i) three different back support conditions (no back support, an...
Article
Full-text available
The biodynamic responses of the hand-arm system under x(h)-axis vibration are investigated in terms of the driving point mechanical impedance (DPMI) and absorbed power in a laboratory study. For this purpose, seven healthy male subjects are exposed to two levels of random vibration in the 8-1,000 Hz frequency range, using three instrumented cylindr...
Article
The influences of the handle size and of the hand forces exerted on a vibrating tool handle on the driving-point mechanical impedance (DPMI) response of the human hand–arm system have been investigated through laboratory measurements performed on seven adult male subjects. Measurements were performed with three instrumented cylindrical handles with...
Article
The distribution of localized pressure peaks and the resulting contact forces over the hand surface are investigated through measurements performed under applications of different combinations of hand grip and push forces in the 0–75 N range. Three different cylindrical handles of 30, 40 and 48 mm are used to measure the hand-induced forces and dis...
Article
Full-text available
The biodynamic response characteristics of 13 male and 14 female seated subjects, exposed to vertical vibration, are characterized under different postural conditions. The measurements are performed for a total of 36 different sitting postural configurations realized through variations in hands position (in lap and on steering wheel), three seat he...
Article
The development of a suspended handle designed to provide attenuation of the vibration and shocks being generated at the tool blow frequency was carried out. The results of the first phase of development of such a handle were based on the development and validation of a model combining the suspended handle and the hand-arm system. It was found that...
Article
The influences of suspension design parameters on the performance of three different suspension seats under high magnitude excitations were investigated using the generalized analytical model developed and validated in the first part of this work. The model was initially applied to study the influences of variations in the seated mass and suspensio...
Article
Performance analyses of suspension seats subject to high magnitude excitations require particular modeling considerations associated with impacts against the motion limiting elastic buffers, possible loss of contact between the seat and the occupant, and component characterization over a wide range of inputs. In this study, three different suspensi...
Article
A spectral class is defined in the 0.5 to 40 Hz frequency range to characterise the vibration at or near the seat attachment point in tracked sidewalk snowploughs during normal operating conditions. The spectral class is defined for the vibrational modes involving longitudinal (x-axis), lateral (y-axis) and vertical (z-axis) motions, and angular mo...
Article
It has been widely reported that the overall vibration comfort performance of static and dynamics seats is strongly influenced by the biodynamic behaviour of the seated human body. The contributions of the seated occupant to the overall vibration attenuation of the coupled seat-occupant system are experimentally investigated as functions of the nat...
Article
The dynamic interactions among various components of a percussive chipping hammer are investigated to identify the internal and external impact processes, and to formulate a nonlinear analytical model of the tool. A three-degrees-of-freedom model of the human hand-arm, recommended in ISO-10068, is integrated with the tool model to derive the couple...
Article
A three degree-of-freedom model is proposed to predict the biodynamic responses of the seated human body of different masses. A baseline model is initially derived to satisfy both the mean apparent mass and seat-to-head transmissibility responses proposed in ISO/DIS 5982:2000 applicable for mean body mass of 75 kg. The validity of the resultant gen...
Article
The potential benefits of a semi-active magnetorheological (MR) damper in reducing the incidence and severity of end-stop impacts of a low natural frequency suspension seat are investigated. The MR damper considered is a commercially developed product, referred to as “Motion Master semi-active damping system” and manufactured by Lord Corporation. T...
Article
The biodynamic apparent mass response characteristics of 24 human subjects (12 males and 12 females) seated under representative automotive postures with hands-in-lap (passengers) and hands-on-steering wheel (drivers) are reported. The measurements were carried out under white noise vertical excitations of 0·25, 0·5 and 1·0m/s2r.m.s. acceleration m...
Article
The biodynamic response characteristics of various mechanical models of the human hand and arm system, reported in the literature, are evaluated in terms of their driving-point mechanical impedance modulus and phase responses. The suitability of the reported models for applications in realizing a mechanical simulator and assessment of vibration beh...
Article
The ride dynamics of a tracked snowplough is analysed through systematic considerations of the track dynamics, track-terrain interactions, road-wheel suspension, secondary suspension and biodynamics characteristics of the human driver. Analytical models of various components are developed and integrated to realise a twelve-degree-of-freedom in-plan...
Conference Paper
The human body behaves like a vibrating physical system having mass, elastic and damping properties. In order to study the biodynamic behavior of the body, it is common practice to model the body as a lumped single or a multiple-degree-of-freedom (MDOF) system. Standards have been developed using the frequency-weighted root-mean-square (rms) accele...
Article
A study was carried out to deal with the difficulty associated with the application of the ISO 10819 test method for evaluating the vibration transmissibility of gloves at the palm of the hand. Four different gloves were tested in three different laboratories (two North American and one European). In these tests, some variations to the ISO 10819 te...
Article
Different occupant-seat models were explored for vibration comfort analyses of automotive seats. A nonlinear model of a seat cushion and its support mechanism was developed based on the measured static and dynamic characteristics. Subsequently, analyses and experiments were performed to examine the applicability of some selected linear occupant mod...
Article
The comfort assessments of automotive seats are attempted through development of seat-occupant models in order to minimize the participation of human subjects in such studies. A nonlinear model of a polyurethane foam (PUF) cushion and its support mechanism is developed through measurement of static and dynamic properties as functions of the seated...
Article
Distribution of contact pressure and forces between the seated human subjects and a visco-elastic seat is experimentally investigated under vertical vibration. The dynamic pressure on the elastic seat is measured under sinusoidal vertical vibration of different magnitudes in the 1–10 Hz frequency range, using a flexible grid of pressure sensors. Th...
Article
A coupled human-seat-suspension model is developed upon integrating asymmetric and nonlinear models of the cushion, suspension and elastic end-stops with a three degrees-of-freedom biodynamic model of the occupant. The validity of the model is examined under harmonic and stochastic vibration excitations of different classes of vehicles, using the l...
Article
The vertical driving-point mechanical impedance characteristics applicable to seated vehicle drivers are measured in the 0.625-10 Hz frequency range with excitation amplitudes ranging from 1.0 to 2.0 m s(-2) using a whole-body vehicular vibration simulator. The measurements are performed for seated subjects with feet supported and hands held in a d...
Article
While a considerable quantity of data has been published on driving-point mechanical impedance, apparent mass and seat-to-head transmissibility magnitude and phase characteristics of seated subjects under vertical whole-body vibration, significant variation is known to exist between various data sets. Such variations may be partly attributed to dif...
Article
The influence of whole-body vertical vibration on the dynamic human-seat interface pressure is investigated using a flexible grid of pressure sensors. The ischium pressure and the overall pressure distribution at the human-seat interface are evaluated as functions of the magnitude and frequency of vibration excitation, and seated posture and height...
Article
The biodynamic response characteristics of various analytical models reported for the seated human body are computed on the basis of the driving-point mechanical impedance and seat-to-head transmissibility magnitude and phase responses. The applicability of the models to represent seated vehicle drivers is assessed on the basis of a weighted normal...
Article
A nonlinear single-degree-of-freedom suspension seat model is combined with a four-degree-of-freedom vehicle driver model derived from the biodynamic response characteristics of the seated body under typical vehicular vibration in the 0 to 10 Hz frequency range. The vertical whole-body biodynamic response behaviour, in terms of driving-point mechan...
Article
The driving-point mechanical impedance of the human hand-arm system is strongly dependent on the grip force and excitation frequency. In this study, the biodynamic response of the human hand-arm is characterized by three and four degree-of-freedom (DOF) linear and nonlinear mass excited model incorporating grip force dependence of the restoring and...