Development in Piezoelectric Weigh-in-motion Systems
Development in Piezoelectric Weigh-in-motion Systems

Author:

Publisher:

Published: 1987

Total Pages: 23

ISBN-13:

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With the current trend towards deregulation in the north american trucking environment, there will be an increasing demand to monitor the ongoing changes in vehicle weights and dimensions. there is now considerable emphasis on producing an accurate weigh in motion (wim) scale that will be relatively inexpensive and yet able to withstand the harsh extremes of the canadian climate. developments in piezoelectric weigh in motion (pwim) systems show a good deal of promise in this regard. this paper reviews the technological developments of pwim, explores parameters affecting the accuracy and longevity of these systems, and shows how pwim can be used: 1) to enhance the data collection efforts of agencies concerned with road safety and pavement deterioration, and 2) to provide for the data collection needs of special programs such as the strategic highway research program (shrp) in the united states and c-shrp in canada. for the covering abstract of the conference see irrd 807058.

Development and Demonstration of a Low Cost Weigh-in-motion Scale System for Highway Applications
Development and Demonstration of a Low Cost Weigh-in-motion Scale System for Highway Applications

Author:

Publisher:

Published: 1989

Total Pages:

ISBN-13:

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In 1986, International Road Dynamics was contracted by the Transportation Development Centre to develop and test a piezoelectric weigh-in-motion (WIM) system that would weigh, classify and count vehicles, and continuously collect data on traffic operating at normal highway speeds. A full-scale system was installed for testing and demonstration purposes on six lanes at a site on Highway 7 north of Toronto. A first test site for the piezoelectric cables was provided and prepared by the Saskatchewan Department of Highways and Transportation; the full system demonstration site was by the Ontario Ministry of Transportation and Communications. The work included the design and construction of prototype electronic hardware to gather signals from the piezoelecric cables and other system components. Software was developed to interpret the cable signals and to provide a user-friendly method on monitoring the scale output. The weigh-in-motion scale could be accessed remotely using a standard computer terminal and telephone modem. Full system tests found that the piezoelectric WIM reliably measures any vehicle weight normally encountered on North American highways. It classifies vehicle types and provides weight measurements with an accuracy comparable to that of existing platform WIM systems. Weight measurement variance, however, is double that of platform WIM scales. Its cost is about 25% that of conventional systems.

Development of a High Precision Weigh-in-motion Axle Load Scale
Development of a High Precision Weigh-in-motion Axle Load Scale

Author: Terry Bergan

Publisher: The Centre

Published: 1991

Total Pages: 96

ISBN-13:

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In 1987 a test was conducted of a high precision, low speed Weigh-in-Motion (WIM) system that could accurately weigh vehicle axles and be used for enforcement purposes at weight scale facilities. A complete prototype system was installed for testing and demonstration at Clavet, Saskatchewan. The system was checked against weights obtained from the static scale in use at the site over nine months. Two additional systems were installed in British Columbia and were monitored over five months, during which the system was subjected to a variety of hostile conditions. This report describes the technical development of the in-road hardware and the data acquisition electronics; the operational characteristics; prototype testing; and the B.C. sites and monitoring.

Evaluation of Thermocoax Piezoelectric Weigh-in-Motion Sensors
Evaluation of Thermocoax Piezoelectric Weigh-in-Motion Sensors

Author: Highway Innovative Technology Evaluation Center (U.S.)

Publisher: ASCE Publications

Published: 2001-01-01

Total Pages: 80

ISBN-13: 9780784475072

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Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Innovation Center. This report describes a program of installation, testing, and evaluation designed to determine the capabilities and limitations of Thermocoax's weigh-in-motion sensor.

Investigation of Environmental Impacts on Piezoelectric Weigh-in-motion Sensing System
Investigation of Environmental Impacts on Piezoelectric Weigh-in-motion Sensing System

Author: Shahram Hashemi Vaziri

Publisher:

Published: 2011

Total Pages: 173

ISBN-13:

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Transportation by trucks plays a major role in North America's economy. The growth of this industry will increase the loads on existing roads and highways and raises the possibility of overloaded vehicles, which causes significant damage to the pavement and consequently will reduce the lifespan of the roads. Weigh-in-motion (WIM) systems technology helps to address the challenge of overloaded vehicles. This technology provides traffic monitoring, collects data for pavement research and design, and improves the capacity of static weigh station operations. However, there is still a lack of knowledge about the behaviour of WIM sensors installed in different environments, which affects reliable and precise data gathering. More knowledge is required on proper installation procedures, pavement design for WIM systems, choice of sensor type for location, and calibration processes. This research is intended to explore the behaviour of WIM piezoelectric sensors under different loads and environmental conditions. Specifically, the effects of air and pavement temperature, and weight and speed of trucks are examined with respect to the estimation accuracy of WIM sensors. To accomplish this, three WIM systems composed of different piezoelectric transducers were installed at the CPATT test site at the Waste Management facility of the Region of Waterloo in 2007, and two WIM systems were installed between exits 238 and 250 on Highway 401 eastbound near Woodstock, Ontario. It was concluded that the output of the polymer piezoelectric sensor is influenced by temperature and weight factors but not by normally observed vehicle speed differences. While temperature can be compensated for, not enough information has been gathered yet does the same for weight factor. It should be noted that very low speeds (e.g.

Piezoelectric Energy Harvesting
Piezoelectric Energy Harvesting

Author: Alper Erturk

Publisher: John Wiley & Sons

Published: 2011-04-04

Total Pages: 377

ISBN-13: 1119991358

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The transformation of vibrations into electric energy through the use of piezoelectric devices is an exciting and rapidly developing area of research with a widening range of applications constantly materialising. With Piezoelectric Energy Harvesting, world-leading researchers provide a timely and comprehensive coverage of the electromechanical modelling and applications of piezoelectric energy harvesters. They present principal modelling approaches, synthesizing fundamental material related to mechanical, aerospace, civil, electrical and materials engineering disciplines for vibration-based energy harvesting using piezoelectric transduction. Piezoelectric Energy Harvesting provides the first comprehensive treatment of distributed-parameter electromechanical modelling for piezoelectric energy harvesting with extensive case studies including experimental validations, and is the first book to address modelling of various forms of excitation in piezoelectric energy harvesting, ranging from airflow excitation to moving loads, thus ensuring its relevance to engineers in fields as disparate as aerospace engineering and civil engineering. Coverage includes: Analytical and approximate analytical distributed-parameter electromechanical models with illustrative theoretical case studies as well as extensive experimental validations Several problems of piezoelectric energy harvesting ranging from simple harmonic excitation to random vibrations Details of introducing and modelling piezoelectric coupling for various problems Modelling and exploiting nonlinear dynamics for performance enhancement, supported with experimental verifications Applications ranging from moving load excitation of slender bridges to airflow excitation of aeroelastic sections A review of standard nonlinear energy harvesting circuits with modelling aspects.