Weigh-in-Motion Data Fitting Based on Least-Squares Method

2011 ◽  
Vol 135-136 ◽  
pp. 1123-1128
Author(s):  
Qian Yu Xu ◽  
Yu Qin ◽  
Juan Li ◽  
Hui Hui Zheng ◽  
Fa Wu Yang
Keyword(s):  
Least Squares Method ◽  
Detection System ◽  
Least Square ◽  
Moving Vehicle ◽  
Motion Data ◽  
Motion System ◽  
Weigh In Motion ◽  
Industry Output ◽  
Method Of Least Square ◽  
Dynamic Weighing

The dynamic weighing technology is multi-domain comprehensive technology, including the mechanics of materials, dynamics, the technology of sensor, the technology of electronic information and so on. Vehicle weigh-in-motion system is a detection system which is used to measure the weight of the moving vehicle. With the development of the transport industry output and commercial trade, Vehicle weigh-in-motion technology is playing a more and more important role. At the same time, the accuracy of the weigh-in-motion data has become the centre of attention. In this paper, use the method of least square and polynomial fitting and the MATLAB mathematical software, by studying and analyzing a mass of weigh-in-motion data，the fitting curve of the vehicle weigh in different speeds is obtained. According the variation law of fitting curve, further improvement need to do in certain standard and weigh carefully as to the true quality when the vehicle is in some speed region.

scholarly journals Vibration analysis of the oscillation support of column load cells in low speed axle-group weigh-in-motion system

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 63
Author(s):  
Zhengchuang Lai ◽  
Xiaoxiang Yang ◽  
Jinhui Yao
Keyword(s):  
Vertical Load ◽  
Restoring Force ◽  
Factors Affecting ◽  
Low Speed ◽  
Motion System ◽  
D’Alembert Principle ◽  
Weigh In Motion ◽  
Load Sensor ◽  
Load Cells ◽  
Dynamic Weighing

Under the condition of dynamic weighing, the support types of the column load cells can be divided into elastic support and oscillation support. The weighing system with oscillation support shows significant vibration characteristics, which affects the weighing accuracy and the fatigue life of the load sensor. In this paper, the dynamic characteristics of the oscillation supporting column load cell in low speed axle-group weigh-in-motion system are analysed. It is found that the restoring force of the oscillation support is approximately proportional to the oscillation angle and the applied vertical load. The dynamic equation of the oscillation support vibration of the column load cells established by means of d’Alembert principle. The numerical calculations of the dynamic response of the weighing system with oscillation support are carried out in the free state and dynamic weighing state respectively. The factors affecting the amplitude and recovery time of the support vibration are obtained. This study provides a reference for the analysis of the dynamic weighing accuracy.

Fatigue performance investigation for hangers of suspension bridges based on site-specific vehicle loads

2018 ◽  
Vol 18 (3) ◽  
pp. 934-948 ◽  
Author(s):  
Yang Deng ◽  
Aiqun Li ◽  
Dongming Feng
Keyword(s):  
Structural Integrity ◽  
Suspension Bridge ◽  
Fatigue Performance ◽  
Suspension Bridges ◽  
Time Step ◽  
Site Specific ◽  
Motion Data ◽  
Motion System ◽  
Weigh In Motion ◽  
Vehicle Loads

Hangers or suspenders of a suspension bridge are the primary load-carrying members and are vital to the structural integrity and service life of the bridge. Site-specific vehicle loads monitored by the weigh-in-motion system can assist to obtain the operational cyclic stresses of hangers. Differing from most existing studies, herein, a framework for fatigue performance investigation for hangers of suspension bridges is proposed utilizing the full information of the weigh-in-motion data. This framework includes four steps: (1) generate influence surfaces for hangers, (2) reconstruct vehicular loading flows based on the weigh-in-motion data, (3) calculate time histories of hanger tension forces, and (4) evaluate fatigue damages and predict fatigue lives. Critical issues, such as the loading configuration of trucks, the threshold of the gross vehicle weight, and the time step for stress calculation, have been studied and discussed in detail. Based on 8-month weigh-in-motion data of a prototype suspension bridge, it is shown that the fatigue damage of hangers can be evaluated day by day, and subsequently the fatigue lives can be predicted. The correlation between the fatigue damages and vehicular loads is also investigated in this study.

scholarly journals Analysis on influence of static calibration on the axle-group weigh-in-motion system accuracy

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 69
Author(s):  
Zhengchuang Lai ◽  
Xiaoxiang Yang ◽  
Jinhui Yao
Keyword(s):  
Dynamic Performance ◽  
Head Tilt ◽  
Factors Affecting ◽  
Static Calibration ◽  
Motion System ◽  
Weigh In Motion ◽  
Gravity Line ◽  
Static Performance ◽  
Dynamic Weighing ◽  
Test Process

The axle-group weigh-in-motion system has two functions: static weighing and dynamic weighing. According to the weighing model, the accuracy of dynamic weighing is affected by the static performance. This paper analyses the size of various factors affecting the static performance, such as sensor tilt installation, platform deformation, platform tilt installation, and these errors will lead to sensor swing, bearing head tilt, gravity line of action and sensor axis direction is not consistent, thus affecting the static weighing accuracy. However static calibration is the best way to reduce or even eliminate the above errors. The dynamic truck scale of different manufacturers with or without static calibration is used in the test process. The results show that the dynamic performance index can meet the requirements only after the static calibration is used.

A new strategy to estimate static loads for the dynamic weighing in motion of railway vehicles

2019 ◽  
Vol 234 (2) ◽  
pp. 183-200 ◽  
Author(s):  
Araliya Mosleh ◽  
Pedro Alves Costa ◽  
Rui Calçada
Keyword(s):  
Traffic Management ◽  
Static Load ◽  
Direct Result ◽  
Train Track ◽  
Static Loads ◽  
Motion System ◽  
Weigh In Motion ◽  
New Strategy ◽  
Train Speed ◽  
Dynamic Weighing

The present paper focuses on the numerical modeling of a weigh-in-motion system developed with the purpose of assessing the static loads imposed by the train onto the track infrastructure. Weigh-in-motion systems would be useful in overcoming the disadvantages typical of the conventional static weighing such as costs and traffic management. However, contrary to the conventional static weighing, weigh-in-motion systems do not allow a direct measurement of the static load since the train–track dynamic interaction gives rise to dynamic loads that are added to the static ones. This study investigates how train speed and track unevenness affect the loads assessed by the weigh-in-motion system. In order to achieve that goal, a comprehensive statistical study was performed based on an extensive amount of calculations. Finally, based on the conclusions and trend identified through the comprehensive parametric study, an approach is proposed to correct the direct result given by the weigh-in-motion system in order to obtain an estimation of the static load.

scholarly journals Comparative Accuracy Analysis of Truck Weight Measurement Techniques

2021 ◽  
Vol 11 (2) ◽  
pp. 745
Author(s):  
Sylwia Stawska ◽  
Jacek Chmielewski ◽  
Magdalena Bacharz ◽  
Kamil Bacharz ◽  
Andrzej Nowak
Keyword(s):  
Measurement Techniques ◽  
Highway Traffic ◽  
Highway Infrastructure ◽  
Measurement Systems ◽  
Motion System ◽  
Weigh In Motion ◽  
Comparative Accuracy ◽  
Bridge Weigh In Motion ◽  
Rational Management ◽  
Truck Weight

Roads and bridges are designed to meet the transportation demands for traffic volume and loading. Knowledge of the actual traffic is needed for a rational management of highway infrastructure. There are various procedures and equipment for measuring truck weight, including static and in weigh-in-motion techniques. This paper aims to compare four systems: portable scale, stationary truck weigh station, pavement weigh-in-motion system (WIM), and bridge weigh-in-motion system (B-WIM). The first two are reliable, but they have limitations as they can measure only a small fraction of the highway traffic. Weigh-in-motion (WIM) measurements allow for a continuous recording of vehicles. The presented study database was obtained at a location that allowed for recording the same traffic using all four measurement systems. For individual vehicles captured on a portable scale, the results were directly compared with the three other systems’ measurements. The conclusion is that all four systems produce the results that are within the required and expected accuracy. The recommendation for an application depends on other constraints such as continuous measurement, installation and operation costs, and traffic obstruction.

Research on Generator Excitation Parameter Identification - PSS Low-Pass Link Parameter Identification

2013 ◽  
Vol 805-806 ◽  
pp. 716-720
Author(s):  
Tao Xu ◽  
Tian Long Shao ◽  
Dong Fang Zhang
Keyword(s):  
Mathematical Model ◽  
Parameter Identification ◽  
Least Squares Method ◽  
Least Square Method ◽  
Least Square ◽  
National Standards ◽  
Matlab Software ◽  
Low Pass ◽  
Newton Iterations ◽  
The Mathematical Model

Combined with the contents of the study-PSS low-pass link parameter identification. Least-squares method is selected. Using least-square method for PSS low-pass link mathematical model are also deduced. For the results, because of the mathematical model is solving nonlinear equations, cannot used by the Newton method directly. So we choose to use Newton iterations, with this feature, choose to use MATLAB software to solve the equation. Identification of the use of MATLAB software lags after the PSS parameters obtained recognition results compared with national standards, identifying and verifying the practicability.

Research on the Wire Drawing Die Pass Parameter Calculation Based on the Least Square Algorithm

2012 ◽  
Vol 591-593 ◽  
pp. 850-853
Author(s):  
Huai Xing Wen ◽  
Yong Tao Yang
Keyword(s):  
Pore Structure ◽  
Least Squares ◽  
Least Squares Method ◽  
Piecewise Linear ◽  
Wire Drawing ◽  
Least Square ◽  
Structure Characteristics ◽  
Drawing Die ◽  
The Wire ◽  
Drawing Dies

Drawing Dies meter A / D acquisition module will be collected from the mold hole contour data to draw a curve in Matlab. According to the mold pore structure characteristics of the curve, the initial cut-off point of each part of contour is determined and iteratived optimization to find the best cut-off point, use the least squares method for fitting piecewise linear and fitting optimization to find the function of the various parts of the curve function, finally calculate the pass parameters of drawing mode. Parameters obtained compare with the standard mold, both of errors are relatively small that prove the correctness of the algorithm. Also a complete algorithm flow of pass parameters is designed, it can fast and accurately measure the wire drawing die hole parameters.

Fuzzy C-Regression Models

2013 ◽  
Vol 278-280 ◽  
pp. 1323-1326
Author(s):  
Yan Hua Yu ◽  
Li Xia Song ◽  
Kun Lun Zhang
Keyword(s):  
Linear Regression ◽  
Least Squares ◽  
Linear Models ◽  
Least Squares Method ◽  
Least Square Method ◽  
Least Square ◽  
Estimation Methods ◽  
Statistical Regression ◽  
Fuzzy Linear Regression ◽  
Fuzzy Degree

Fuzzy linear regression has been extensively studied since its inception symbolized by the work of Tanaka et al. in 1982. As one of the main estimation methods, fuzzy least squares approach is appealing because it corresponds, to some extent, to the well known statistical regression analysis. In this article, a restricted least squares method is proposed to fit fuzzy linear models with crisp inputs and symmetric fuzzy output. The paper puts forward a kind of fuzzy linear regression model based on structured element, This model has precise input data and fuzzy output data, Gives the regression coefficient and the fuzzy degree function determination method by using the least square method, studies the imitation degree question between the observed value and the forecast value.

Application of High-Linearity Analog Optocoupler in DSP Acquisition Circuit

2012 ◽  
Vol 232 ◽  
pp. 944-948 ◽  
Author(s):  
Ying Qi Tan ◽  
Xiang Yang Liu ◽  
Bao Qing Den
Keyword(s):  
High Accuracy ◽  
Least Square ◽  
Experiment Data ◽  
Good Linearity ◽  
High Linearity ◽  
Analog Signals ◽  
Noisy Signals ◽  
Method Of Least Square ◽  
Proper Design ◽  
Hardware Circuit

An applied hardware circuit for detecting the AGC signals isolated with DSP is designed based on a high-linearity analog optocoupler. The problem of narrow measuring scope, low linearity and instability which caused by noisy signals is resolved when collects industrial analog signals into DSP. The practical circuit with proper design of components is designed through repeated experiments. The experiment data are analyzed by the method of least-square. The analyzed results show this circuit has the high accuracy and good linearity.

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