Download or read book Evaluation of Highway Truck Seats for Reducing Whole body Vibration written by Forest Engineering Research Institute of Canada and published by Pointe Claire, Que. : Forest Engineering Research Institute of Canada = Institut canadien de recherches en génie forestier. This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Highway Truck Seats for Reducing Whole Body Vibrations written by and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Report No TR 102 Evaluation of Highway Truck Seats for Reducing Whole body Vibrations written by Forest Engineering Research Institute of Canada and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of an Intervention to Reduce Truck Drivers Exposure to Whole body Vibration written by Thomas Louwers and published by . This book was released on 2016 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction. The high prevalence of low back pain in drivers of commercial motor vehicles is well-documented. A number of interventions to reduce low back pain in commercial motor vehicle operators have focused on reducing exposures to wholebody vibration (WBV). Objective. An intervention to be evaluated for the trucking industry is an air-filled ballistic seat pad designed to reduce exposure to WBV. The effectiveness of the seat pad in semi-trucks has not yet been established. Results from a previous pilot study involving 12-ton and 16-ton vibratory rollers used by Seattle Public Utility drivers suggest that the seat pad is not effective at very low speeds (1-3 mph). Methods. The current study measures, characterizes and compares WBV exposures in nine truck drivers who operated their trucks over the same roads. WBV exposures were compared between their existing air-suspension seat and the air-filled ballistic seat pad which sat on top of their existing seat. This study uses a Wilcoxon signed rank test to compare the seat pad’s effectiveness in reducing WBV exposures relative to their existing air-suspension seat. Results. Overall, the truck drivers' vibration exposures were above daily vibration action values set by the International Standards Organization (ISO) and the air-filled ballistic seat pad did not significantly reduce WBV exposures relative to the WBV exposures experienced with their existing air-suspension seat. Conclusions. In the semi-trucks evaluated in this study, the air-filled ballistic seat pad was not effective in reducing WBV exposures. The seat pad has been shown to be effective in reducing WBV exposures in public transportation buses and cars. The answer for why the air-filled seat pads were not effective in semi-trucks may lie in a future analysis of the power spectral densities, which shows the vibration exposures as a function of frequency. Buses and cars produce more high frequency vibration energy, and the air-filled seat pad has been shown to be effective in these vehicles when travelling at moderate to high speeds. Trucks may produce less high frequency vibration energy, and this may have diminished the air-filled seat pad’s effectiveness in the semi-truck evaluated in this study.

Download or read book Evaluating Whole Body Vibration and Standing Balance Among Truck Drivers written by Molly Halverson and published by . This book was released on 2013 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 60% of fatal fall-related occupational injuries occur in the long haul freight trucking industry. Exposure to whole body vibration (WBV) from driving or operating vehicles has been shown to negatively affect balance and may contribute to falls when entering or exiting the vehicle. Fall-related injuries are eight times more likely to occur upon exiting the vehicle than entering. It is hypothesized that WBV has a detrimental effect on postural stability upon truck egress and may be a contributing factor to falls when truck drivers egress their truck. Using field-collected WBV exposures from the floor of a truck cab, a three-dimensional vibrating platform (hexapod system) was used in a laboratory setting to expose eight truck drivers to two hours of simulated truck driving. The hexapod system provided an accurate and systematic method to simulate these vibrational exposures for the purpose of investigating whether balance changes occurred with prolonged exposure to WBV. Using a repeated measures design, the truck drivers participated in two exposure levels: 1) sitting in an electromechanically active-suspension vibration-reducing seat, and 2) sitting in a standard passive, air-suspension truck seat. Based on field measurements, WBV exposures were expected to be approximately 50% lower in the seat with the electromechanically active-suspension. Seat order was randomized and counterbalanced. Immediately before exposure to WBV, after two hours of exposure, and five and ten minute post exposure, participants were asked to stand on a Wii balance board under two conditions, one with the eyes closed and the other with the eyes open. Each measurement lasted 30 seconds during which the standing balance center of pressure (COP) deviations were measured. In addition, a subcomponent of the Mini-BEST test, a qualitative clinical balance assessment tool, was performed to complement the quantitative force plate measurements. The association between exposure to WBV and postural instability was assessed pre- and post- WBV exposure, in the ten minutes post-exposure, and between the two different WBV exposures (the two seat conditions). Postural measurements of interest for the COP deviations focused on medio-lateral (ML) path length, anterior-posterior (AP) path length, and total path length. Secondary variables included the standard deviation of the AP and ML components. Other variables of interest included assessing the balance measurements with the eyes open/closed to determine whether the visual component of vibration, vestibular component, or both induced imbalance. Significant differences were found between all balance measurements (ML, AP, total path length) before and after WBV exposure for eyes open status but not eyes closed. Relative to the passive, air-suspension seat, the subjects' WBV exposures were roughly 50% lower with the active suspension seat. The decrease in WBV exposure associated with sitting in the active suspension seat did not affect postural balance when compared to the passive, air-suspension seat. After 10 minutes post exposure, balance measurements (path lengths) had returned to baseline in the eyes open balance measurements but were better (shorter than baseline) in the eyes closed measurement.

Download or read book The Human Response Study to Whole body Vibration in the Cab of Heavy Duty Truck written by and published by . This book was released on 2009 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lower back pains are observed to be the most significant problem for most of the industrial workers who operate commercial trucks. Several factors such as road type, truck type, load, etc, have been found to affect the vibration exposure on the truck drivers. The main purpose of the current research is to collect the responses of Whole-body vibration to the truck driver and analyze the current levels of excitation from a variety of trucks. Present thesis work also examines the effects of different trucks, road types and loads to Whole-body vibration. Data collected in the United States on different types of trucks were processed with different processors and analysed as per the international standards: ISO 2361-1. First set of data were taken with HVM-100 on a scheduled on-road route from driver's seat cushion on different roads and load conditions. Second set of data were collected by DEWE data acquisition system from the trucks running on the same on-road route, with the application of additional transducers on driver's seat back, passenger's seat cushion as well as the cab floor. The frequency-weighted r.m.s accelerations were compared by different trucks on two different road types: interstate and rural highway for HVM data. The results from the same trucks with loaded trailer or without loaded trailer were also discussed in this thesis. The data recorded by DEWE system were analyzed with Matlab program to compare the frequency-weighted accelerations for different trucks. Additional analysis with VDV and jerk were also done. Road type was the primary factor affecting the driver's exposure. For both studies, the minimum 8-hr and the minimum 11-hr standard limits requiring a medical examination set by the standard for health were exceeded several times whereas the same for comfort was exceeded a lot of times. Overall, the driver was found to be safe as per ISO 2631-1 but the comfort levels were often exceeded. It is suggested that necessary action be taken to increase the comfort.

Download or read book Design of an Off highway Truck Seat for the Reduction of Whole body Vibration and Operator Fatigue written by Mayuree Norphat and published by . This book was released on 2004 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluating the Effects of Altering Whole body Vibration Exposures on Truck Drivers Vigilance written by Fangfang Wang and published by . This book was released on 2021 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whole-body vibration (WBV) may contribute to truck driver fatigue and increase the potential for vehicular accidents. Previous studies of truck induced WBV exposures have mostly focused on physical discomfort, whereas there is little quantitative research on how WBV affects drivers' alertness levels. The goal of this study is to explore whether there is an association between exposures to WBV and truck drivers' vigilance, the fundamental aspect of attention. Truck driver's vigilance was measured using Psychomotor Vigilance Task (PVT). Furthermore, a laboratory-based study and a field study were conducted to assess drivers' vigilance performance with different levels of exposure to WBV created by using seats with different vibration damping performance. The results indicated that the changes of drivers' vigilance were dependent on the WBV exposure levels. Less decline in vigilance performance was found after drivers sat in the truck seats that exposed them to lower levels of vibration, which may be due to seat-related differences in the vibration attenuation performance, and in particular, the attenuation of low frequency energy (1 - 4 Hz) in these seats. This dissertation provides evidence that truck seats, and ultimately different levels of exposure to WBV, may influence driver fatigue and the truck driver's vigilance.

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1994 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Seat Suspension Control System Design for Heavy Duty Vehicles written by Haiping Du and published by Academic Press. This book was released on 2020-05-22 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Seat Suspension Control System Design for Heavy Duty Vehicles provides systematic knowledge of the advanced seat suspension design and control for heavy duty vehicles. Nowadays, people are paying more and more attention to ride comfort and the health of drivers and passengers. This is especially for heavy duty vehicles, where drivers/operators are exposed to much severer vibrations than those in passenger vehicles due to a harsh working environment, operating conditions, and long hour driving, etc. Seat suspension systems can effectively help to suppress the high magnitude vibration transmitted to drivers with relatively simple structure and low cost, and hence are widely adopted in heavy duty vehicles. This book helps researchers and engineers to have a comprehensive understanding of the seat suspension system and to conduct in-depth studies on seat suspension design and control; this book covers a wide range of perspectives about seat suspension design and control methods. - Describes the variable damping, variable stiffness, and, especially, variable inertance seat suspensions - Provides the advanced and comprehensive knowledge about semi-active vibration control - Introduces the multiple-DOF seat suspension - Includes the innovative hybrid seat suspension and nonlinear seat suspension - All the introduced designs have been prototyped and experimentally validated - Provides Matlab Simulation programming codes

Download or read book Technical Report TR 99 Evaluation of Skidder Seats for Reducing Whole body Vibration By J M Golsse written by Forest Engineering Research Institute of Canada and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book List of FERIC Publications 1975 1995 written by Forest Engineering Research Institute of Canada and published by . This book was released on 1996 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vibration Suppression and Safety Seat Motion Design of a Hyper active Seat written by Samuel John Klooster and published by . This book was released on 2004 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whole-body vibration is an important problem facing operators of off-road vehicles. Research has shown that operators exposed to low-frequency whole-body vibration can experience temporary and even permanent injuries. One solution to this problem is to develop an active seat capable of canceling the vibrations felt by the operator. Several passive, semi-active, active, and fully active seats have been designed and built to address this problem. Furthermore, controllers have been developed to optimize the seat performance. Vibration cancellation seating systems seem to be a promising and practical way to reduce the effects of whole-body vibration. To extend developments in this area, a Hyper-Active seat has been designed and built at the Georgia Institute of Technology. The seat utilizes a 3 Revolute-Prismatic-Revolute (RPR) parallel manipulator design which allows for the independent control of the vertical, horizontal and pitch angle directions. The seat is powered using three hydraulic actuators which are controlled using MATLAB's Simulink, xPC Target, and Real-Time Workshop. Controllers were developed to control the position of the seat, as well as cancel unwanted vibration. To test the performance of the Hyper-Active seat, the system identification of the seat was undertaken using open-loop forcing functions. The seat was evaluated in each degree of freedom to understand the potential of the seat to cancel harmful vibration. In addition to reducing harmful vibrations, the seat can double as a safety seat to reduce injuries during a frontal collision. If the front edge of the seat bottom can be raised very quickly, then the forward motion of the passenger can be reduced during a crash. An optimal method for performing this motion is developed.

Download or read book Human Factors in Simple and Complex Systems Second Edition written by Robert W. Proctor and published by CRC Press. This book was released on 2008-04-22 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: In terms of simple and complex systems, it is a whole new world out there. At the initial publication of this book, fourteen years ago, the web was in its infancy, DVDs did not exist, cell phones were few and far between, and the information superhighway was just a blip upon the horizon. If you used the terms "social engineering," you were most likely a political scientist, and if you were "phishing" you might be listening to a rock band. The second edition of a bestseller, Human Factors in Simple and Complex Systems provides the necessary understanding of the breadth and depth of human factors issues that influence the design, implementation, and evaluation of products and systems. Emphasizing the close relationship between basic theory and application, the authors delineate a framework for the research process, present an integrated view of the current state of knowledge, and examine how these factors can be applied to system design. The new edition addresses such concepts as situation awareness and highlights topics of interest, with a special focus on computer applications and human-computer interaction. See what’s new in the Second Edition New topics, such as situational awareness, that capture the tremendous changes in human factors and ergonomics Tightly integrates basic research and application, strengthening the link between knowledge and practice Each chapter includes a separate box that discusses a topic of current interest related to human interaction with computers and recent technology Demonstrating a general approach to solving a broad range of system problems, the book provides coverage of the theoretical foundation on which the discipline of human factors is built. Structured around human information processing, it covers the full range of contemporary human factors and ergonomics, then shows you how to apply them.

Download or read book General Technical Report SO written by and published by . This book was released on 1977 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Topics in Structural Dynamics Volume 5 written by Nikolaos Dervilis and published by Springer. This book was released on 2018-05-30 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special Topics in Structural Dynamics, Volume 5: Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics, 2018, the fifth volume of nine from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Structural Dynamics, including papers on: Experimental Methods Analytical Methods General Dynamics & Modal Analysis General Dynamics & System Identification Damage Detection

Download or read book Traffic Safety Facts written by and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: