Currently, several backcalculation software are available. Falling weight deflectometer, fwd, pavement evaluation. Positive results and good correlation between insample and outofsample backtesting and forward performance testing increases the probability that a system will perform well in actual. The analysis of deflection data collected by the falling weight deflectometer fwd provides a quick and reliable way to characterize the properties of the paving layers, as well as to assess the load carrying. Chapter five data analysis falling weight deflectometer. Proceedings of the 2nd geomeast international congress and exhibition on sustainable civil. Deflection analysis of pavement structures for fwd data. Understand your application better with fwd source code analytics. Michback is a computer program for the backcalculation of flexible and composite pavement layer properties using data obtained with a falling weight deflectometer fwd. The magnitude of the load, duration and area of loading is so adjusted that it. Dynamic analysis of fallingweight deflectometer data.
Using falling weight deflectometer data with mechanisticempirical design and analysis, volume ii. You are able to navigate to the fwd datafile directory in the same manner as other windows. Comparison of static and dynamic backcalculation of flexible. Can someone suggest the software for back calculation of. It is a trailermounted device that operates by dropping a weight on to the pavement. Slope stability back analysis using rocscience software. Falling weight deflectometer the fwd has been developed from the deflectmetre a boulet originally devised by bretonniere in 1963. Can someone suggest the software for back calculation of falling weight deflectometer observations. Daps software deflection analysis of pavement structure backcalculation of layer stiffness from deflection data using the singular value decomposition technique.
It is a trailermounted device that operates by dropping a weight on to the pavement and measuring the resulting pavement deflections. Can someone suggest the software for back calculation of falling. Its like a virtual secretary for email this program will both save you time and improve your email efficiency. Fallingweight deflectometer data from three inservice pavement sections has been used to analyze dynamic response characteristics. The first step in any modernization or code improvement effort is to understand the target application. Using falling weight deflectometer data with mechanistic. A sophisticated software available for research groups for analysis of complex pavement interactions. Each available program has its own set strengths and weaknesses, and no two programs give exactly the same set of results.
Flexible pavement evaluation by falling weight deflectometer. At least 3 years of relevant professional experience in business analysis and design, preferably in an insurance industry setting. However it is not known which software produces accurate and consistence modulus values. Schematic diagram of falling weight deflectometer the backcalculation process the purpose of back calculation is primarily to find out the insitu elastic moduli e of the different pavement layers. The pri 2100 fwd trailer is the classic and flexible solution. Improving the accuracy and usability of iowa falling. Backward analysis can provide information about some future properties back. Backcalculation of layer stiffness from deflection data using the singular value decomposition. If information is known on the thickness of the pavement layers, the collected fwd data can then be processed, through back analysis, to establish pavement material layer stiffness, residual life and any. Fwd can measure the timedomain deflection on numerous road sections, and has been used to back calculate mechanical pavement properties using specific software involving forward and backcalculation directions goktepe et al. Backcalculating layer moduli, using the deflections measured by the fwd. See the details for how to specify the formulae and how they are used. Stock systems and back testing 810 optuma has back testing well covered also, with a wellimplemented backtesting and system analysis toolset.
Results showed that the dynamic analysis of falling weight deflectometer test and prediction for the strength of character of flexible pavement layer moduli have been achieved, and algorithms for interpretation of the deflection basin have been improved. The fwd is a versatile and important tool that can be useful in the management of an entire road network for the purpose of maintenance and repair planning. Pavement structural evaluation production level fwd back. Analysis software for our global fwd products jils in. Daps deflection analysis of pavement structures is a rapid, accurate and reliable method for performing back calculation of deflection results. This post addresses two different methods, fixing forward and rolling back, to recover from failures and errors, in production and during development. Analysis software for our global fwd products jils in california. Back analysis is best supported with ground penetrating radar gpr data and coring. Fwd data is primarily used to estimate pavement structural capacity for 1. Producing quality computer tools for racers and engine builders since 1986.
Backcalculation can be made with softwares of other origin but usually the field database should be transformed to the data format defined in the given software. If the fwd file contains multiple drops at the same load level then the program will use the last set for analysis. You may want to check out more software, such as cdr data analysis software, data analysis system or seismograph data analysis, which might be related to fwd data analysis. Fwd data analysis first of all, this program is a work in progress. Advanced tools such as monte carlo simulation and finite elements can enhance the depth and scope of pavement analysis and design calculations. Utilizing the latest research provided by the heavy vehicle simulator and based on 35 years of worldwide consultancy experience, elmod is unparalleled at modeling pavement performance and is practical, fast and easy to use. Iowas intelligent pavement backcalculation software. The program will automatically default to the load level closest to 9000 lbs if this option is not used.
Deflection basin measurements have been made with the falling weight deflectometer fwd on all test sections that are included in the long term pavement performance ltpp program. Dynatest explorer brings all the pavement survey information together, providing the engineer an overview and the ability to make reports to different stakeholders. Elmod analyzes the pavement response from the fwd and hwd by determining the modulus, stress and strain of each significant layer. A falling weight deflectometer fwd is a testing device used by civil engineers to evaluate the physical properties of pavement. Collection and interpretation of pavement structural.
Calback contains specific features pertinent to california and is designed to work standalone, or in concert with the flexible pavement design and analysis software calme. Rubicon toolbox is a suite of tools that can greatly increase the productivity of engineers involved with pavement rehabilitation design. This provides the capability of acquiring real time thickness at every test point during deflection testing. Daps deflection analysis of pavement structures is a rapid, accurate and reliable method for performing backcalculation of deflection results. Falling weight deflectometer fwd test data are processed by backcalculation software to obtain modulus of layer materials of airport pavements.
The manufacturers of fwds can supply own backcalculation softwares. Fwd funds are created to answer your different investment objectives and risktaking capabilities. Evaluating falling weight deflectometer back calculation software for aircraft pavement strength rating. The fwd now saves its test data in access tables rather than the older ascii text format. Using deflection data and other pertinent information obtained from shrp pavement test sections, the selected software was exercised by a group of evaluators which included the program developers. Backcalculation can be made with softwares of other origin but usually the. It reports the layer of failure and residual life by utilizing the lcca module which allows the user to select the optimum rehabilitation alternatives. It collects up to three drops of data in seconds or less. Slope stability back analysis using rocscience software a question we are frequently asked is, can slide do back analysis. The fwdcal computer program was developed to automate the analysis of the results of the relative calibration performed with this device.
Evaluation of fwd software and deflection basin for. A force pulse is applied to the road surface by a specially designed loading system which represents the dynamic shortterm loading of a heavy wheel load 1 esa. Recently, a deflection analysis of pavement structures daps software has been developed, which enables the rapid calculation of layer stiffness moduli using a singular decomposition technique. The field programs used to capture fwd results can be set to display at the time of test, the full time history of all deflection sensors. Make sure your bank is catching all fraud enabled by the latest threats.
Dynatest has designed and developed a suite of software to aid pavement engineering and management. A good example is constant propagation where you provide the value of variables to code further down the line. This study aims to improve the accuracy and usability of iowa falling weight deflectometer fwd data by incorporating significant enhancements into the fullyautomated software system for rapid processing of the fwd data. Despite the fact that interpretation of deflection data are remain somewhat problematic. A highquality, easytouse, backcalculation software package called iowa pavement backcalculation i back was developed to achieve the project goals. More efficient and faster methods in fwd test data analysis were demanded and deemed necessary for routine analysis. As you can see, there are some features that are not yet implemented. Iowas intelligent pavement backcalculation software geo. The falling weight deflectometer fwd generates and records a pavement deflection bowl simi lar to that produced by a heavy vehicle travelling at highway speeds. Index using falling weight deflectometer data with mechanistic. Improving the accuracy and usability of iowa falling weight.
Fwd data is primarily used to estimate pavement structural capacity for 1 overlay design and 2 to determine if a pavement is being overloaded. Dynamic analysis of falling weight deflectometer sciencedirect. Using deflection data and other pertinent information obtained from shrp pavement test sections, the selected software. Our antivirus scan shows that this download is clean.
However, the pavement layer moduli backcalculation techniques used so far have been cumbersome and time consuming. Get the advantage of investing in a full spectrum of fwd funds that allow you to potentially grow your wealth. Front and rear suspension analysis simulation software program. The program uses input files generated by fwd to excel converter and displays additional data that you may use later for analysis. All that is necessary is to upgrade the equipment from a standard 7150 kn falling weight deflectometer to a 7250 kn heavy weight deflectometer hwd or even to a super heavy weight deflectometer shwd 7300 kn is to add more weights, a larger load cell and upgrade software.
Whether you are a riskaverse, risktolerant or a moderate investor, there is an fwd. Backanalysis of a measured deflection bowl is a widely accepted method for estimating the existing pavement materials elastic properties this is required for undertaking the rehabilitation treatments mechanistic design. The illiback software was specifically developed for twolayer pcc. The falling weight deflectometer fwd is a device that is used to evaluate pavement and pavement layer stiffness. Look back analysis qualifies the risk of every historical transaction in the context of each users typical behavior, looking for highrisk. Comparison of static and dynamic backcalculation of flexible pavement layers moduli, using four software programs. We request feedback regarding any results which appear anomalous so that we can study the initial models more closely to see whether refinements are appropriate. Normally only the peak deflections of the fwd are recorded on disk and the bulk of the data is discarded, because it is not used in the standard pseudostatic back analysis. Modules available under this package include the following. Abatechs software for back analysis of fwd deflection data collected from various types of falling weight deflectometers. The data files required by the fwd data analysis program have been formatted to contain only the necessary data from the original access tables.
In falling weight deflectometer fwd test an impulsive load is applied on the road surface. Different manufacturers use different data formats. Hi, im dirk van wijk, a 17 year old software developer from the netherlands. With luck, the results of two different backcalculation programs may be close to one another. Application of modern technology in terms of hardware and software s can lead back analysis to an. Consistency and accuracy of selected fwd backcalculation software for computing layer modulus of airport pavements january 20 international journal of geotechnical engineering 71. The default filename for the programs installer is fwddataanalysis. Can someone suggest the software for back calculation of falling weight. All data taken by the jils20 fwd is recorded for future analysis by back calculation programs or for jils own testing.
Collection and interpretation of pavement structural parameters using deflection testing part ii. Iowas intelligent pavement backcalculation software abstract the iowa department of transportation dot has been collecting falling weight deflectometer fwd data on a regular basis. The ltpp program uses the dynatest model 8000 falling weight deflectometer fwd to measure the deflection response of the test pavement structures. The fwd and tow vehicle are traffic signs manual chapter 8 compliant. The pavement response is analyzed with dynatests elmod evaluation of layer moduli and overlay design software. This free program is a product of mndot pavement design.
Backtesting is the process of testing a trading strategy on relevant historical data to ensure its viability before the trader risks any actual capital. The techniques used are generally robust but there are occasional instances where changing the back analysis parameters will cause significant variations in predictions. Falling weight deflectometer fwd mndot pavement design. The idea is that this program is not just a tonn replacement, but, a more complete data analysis. The software is written using modern windows programming languages with this version being developed for the windows 98 operating system.
Eris inhouse developed pavement analysis software is customized specifically for use with nondestructive deflection testing ndt using falling weight deflectometers fwd. Calback is a software developed by caltransucprc to backcalculate layer moduli of flexible and rigid pavements using fwd deflection data collected from existing pavements. Fhwahrt16010 march 2017 research, development, and technology turnerfairbank highway research center 6300 georgetown pike mclean, va 221012296. It is free and is based on a new algorithm for multilayered analysis called leaf. This chapter discusses various approaches in fwd data analysis and interpretation. The answer is yes, as we will discover in this article, which describes various methods of back analysis using slide and other rocscience software. Eris inhouse developed pavement analysis software is customized. Interpretation of falling weight deflectometer data. Previous software development experience is an advantage. The importance in supplying safe and stable equipment and the newest technology forms the basis of the fwd equipment. The only cable connecting the trailer with the towing vehicle is the pc computer cable. Most data collected by the faas falling weight deflectometer is populated into the national airport pavement test facility naptf database. Installation the following files should be present on the install disk. Mar 12, 2016 elmod 6 how to use elmod for backcalculation fwd.
The fwd is fitted with submetre accurate gnss global navigation satellite system equipment and air and surface temperature sensor for integrated data logging. Pavement analysis software interpretation of structural evaluations general information regarding principles of pavement design and structural evaluation is given in the austroads pavement design. The jils20 fwd is trailermounted and tested for a variety of conditions. When talking about fwd in this video i am talking about cars in general and not just performance cars. Introduction pavement structures provide a vital part of our transportation system. Emphasis will be placed on verifying repeatability of fwd results, linearity of load impact, plate size and the development of improved back calculation methods. Mounted on a doubleaxle trailer it is independent of the towing vehicle and can be towed by any vehicle. Daps software deflection analysis of pavement structure. Back analysis can be used to determine material strength at slope. However, files generated from the equipment can be applied in any other back calculation program. Tonkin and taylor collection and interpretation of pavement structural parameters using deflection testing part ii. Understand your application better with fwd source code. Oct 07, 2019 falling weight deflectometer fwd tests back analysis consists of a process in which a calculated deflection bowl is gradually approximated to its test measured counterpart by adjusting the. The rosy design, a back calculation software for both road andor airport data analysis.
The dynatest falling weight deflectometer fwd applies a dynamic load that simulates the loading of a moving wheel. The analyzed data will be used later in the project along with computer predictions of pavement response to back calculate engineering properties of pavements. Eli back for rigid pavement, and issem4, modcomp3, modulus and wdef for flexible pavements. Backcalculation of flexible pavement layers moduli, using four software programs.
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