Download or read book The Development of Low cost Dust and Road Roughness Measuring Equipment written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dust generation by vehicles on unsealed roads can cause serious air pollution, reduce visibility and the safety of motorists, pedestrians and workers and pose an overall hazard to health. Prior to the development of a road dust monitor, dust levels were either subjectively judged on a scale of one to five by the driver of the vehicle or by an observer at the roadside, or dust was collected in receptacles and then weighed. For obvious reasons, these methods are unacceptable for the monitoring of the effectiveness of dust palliatives or for the determination of acceptability criteria for dust on unsealed roads. A vehicle-mounted dust monitor was developed at the CSIR to quantify road dust levels. This dust monitor, which incorporates an infra-red measuring system, was developed in three phases over a four year period. A statically mounted system was developed for use on very rough roads, underground haul roads and sections where dust needs to be measured over extended periods. Road roughness contributes significantly to vehicle operating costs and is therefore used to determine optimum maintenance intervals. Accurate measuring equipment is required for experimental work to develop deterioration models and to compare the performance of stabilised sections. In South Africa, a Linear Displacement Integrator (LDI) has been used for roughness measurements. However, this equipment is relatively expensive, vehicle dependant and generally unsuitable for accurately measuring short experimental sections. The CSIR therefore identified the need for a low-cost road roughness integrator (LORRI) for use in areas where it is not feasible to use an LDI. The LORRI incorporates a frame with front and rear wheels. A trailing arm with a measuring wheel is attached to the front wheel. A linear potentiometer connected between the frame and the trailing arm measures vertical movement and hence the road roughness. Speed and distance travelled is determined with a metal detection and sensor system. Data is processed on a data acquisition system and information is displayed and stored on a notebook computer. Repeatability tests and a comparison with an LDI were carried out on road surfaces of varying roughness. The repeatability of the measurements were considered acceptable and the comparison of the LORRI measurements with those of the LDI correlated well. The LORRI can be used where traditional equipment is not feasible nor cost-effective, for quality control of labour intensive and community based construction and maintenance and calibration of LDI equipment. For the covering abstract of this conference see IRRD number 872978.
Download or read book Measuring Road Roughness and Its Effects on User Cost and Comfort written by Thomas D. Gillespie and published by ASTM International. This book was released on 1985 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The MERLIN Low cost Road Roughness Measuring Machine written by M. A. Cundill and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1999 with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calibration of Road Roughness Measuring Equipment Volume II Calibration Procedures Final Report written by T. V. Vorburger and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Road Roughness Technology State of the Art written by Glenn G. Balmer and published by . This book was released on 1973 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Enhancement of a Low Cost Roughness Measuring Device written by Lowell V. Babb and published by . This book was released on 1983 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calibration of Road Roughness Measuring Equipment written by and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume I: Experimental Investigation, documents an extensive series of measurements of the performance of a commercial inertial road profiling system (IRPS) and a commercial response-type road roughness measurement (RTRRM) system. Based upon the results of these measurements and upon an analysis of the operation of such equipment, calibration and testing guides, given in the Volume II were developed to assist users in assessment of IRPS and RTRRM functionality and operating performance.
Download or read book International Road Roughness Experiment written by Michael W. Sayers and published by . This book was released on 1986-02-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Noss Roughness Meter written by PM. Noss and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a new Norwegian device for the measurement of road roughness started in 1985. A prototype is now finished. Tests demonstrate that longitudinal profiles of wheeltracks measured with this equipment meet the requirements to qualify as "Class 1: Precision profiles" [1], which represent the highest standard of accuracy for measurements of the International Roughness Index (IRI).
Download or read book Calibration of Road Roughness Measuring Equipment Experimental investigation written by T. F. Vorburger and published by . This book was released on 1989 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidelines for Conducting and Calibrating Road Roughness Measurements written by Michael W. Sayers and published by . This book was released on 1986 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Road roughness is gaining increasing importance as an indicator of road condition, both in terms of pavement performance, and as a major determinant of road user costs. This paper defines roughness measurement systems hierachically into four groups, ranging from profilometric methods (2 groups), through response type road roughness measuring systems (RTRRMS's), and, subjective evaluation. The International Roughness Index (IRI) is defined, and the programs for it's calculation are provided. The IRI is based on simulation of the roughness response of a car travelling at 80 km/h. The report explains how all roughness measurements can be related to this scale, also when travelling at lower speeds than 80 km/h. The IRI emerges as a scale that can be used both for calibration and for comparative purposes.
Download or read book Development and Evaluation of an Inertial Based Pavement Roughness Measuring System written by Fengxuan Hu and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Roughness is an important indicator of pavement riding comfort and safety. It is a condition indicator that should be carefully considered when evaluating primary pavements. At the same time, the use of roughness measurements plays a critical role in the pavement management system. There are many devices used for roughness evaluation. The major tools used for road roughness quantify are the road profilers. In the thesis research, in order to obtain useful pavement surface condition data for pavement evaluation, an inertial based pavement roughness measuring system was developed with the combination of modern sensor technology and computer technology. The research will focus on the development of new method to get the profile in order to improve the repeatability of the inertial based pavement roughness system, the hardware design and the software development which is used for data sampling and data analysis. Finally maximum entropy spectral analysis method was used to evaluate the road profile spectrum. In order to get evaluate the accuracy and correction of the laser profiler system, different roughness devices (including Dipstick, direct type profiler and the laser profiler developed) were operated in the test sites. The research focused on several performance measures, such as repeatability (before and after new method analysis), impact of operating speed and sample interval, correlativity and etc. IRI from these devices were analyzed to evaluate the correlativity between these devices. Some regression models were developed in this research. Test results show that the new method can improve the repeatability of the profiler system. The laser profiler system has good repeatability and the operating speed and sample interval do not have a significant impact on the inertial based roughness measuring system. With the reliable results, the system is ready to be used in the field application within the speed and sample interval range. Through the spectrum analysis, it shows that the spectrum has a qualitative relation with pavement roughness conditions.
Download or read book Industrial Arts Index written by and published by . This book was released on 1928 with total page 2082 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gravel Roads written by Ken Skorseth and published by . This book was released on 2000 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Download or read book The Development of a Simple Instrument for Measuring Pavement Roughness and Predicting Pavement Rideability written by GF. Hayhoe and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the results of recent research, it is possible to develop performance specifications for a simple instrument that would measure profile-type roughness in only one wheelpath--instead of two, as in the profilometer--and which would compute a roughness index that is as highly correlated with pavement rideability measurements as the roughness indexes derived from the full profile.
Download or read book Calibration of Road Roughness Measuring Equipment written by and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
