Development of high precision gravity center position measurement system for large heavy vehicles

2005 ◽  
Author(s):  
Xintong Zhao ◽  
Hongzhou Jiang ◽  
Shutao Zheng ◽  
Junwei Han
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Heavy Vehicles ◽  
Position Measurement ◽  
Gravity Center ◽  
Center Position

Precision Gravity Center Position Measurement System for Heavy Vehicles

2006 ◽  
Vol 315-316 ◽  
pp. 788-791 ◽  
Author(s):  
Xin Tong Zhao ◽  
H.Z. Jiang ◽  
S.T. Zheng ◽  
Jun Wei Han
Keyword(s):  
Three Dimensional ◽  
Heavy Vehicles ◽  
Position Measurement ◽  
Motion Platform ◽  
Gravity Center ◽  
Inertial Parameters ◽  
Safety Research ◽  
Control Scheme ◽  
Driven System ◽  
Center Position

Knowledge of a vehicle’s inertial parameters is essential for safety research and accident reconstruction. A precision measure system is proposed to determine the weight and gravity center for heavy vehicles. Based on a static gravity measuring principle with three measuring points, a hydraulically driven 2-DOF motion platform is developed. The transfer function model is derived for the hydraulically driven system. By means of a degree-of-freedom control scheme, the platform can realize accurate positioning to construct two intersected planes and work out the three-dimensional coordinates of the vehicle gravity center. Experiments demonstrate that the system has less than 0.3% measurement error in weight, and is able to measure the gravity centre accurately with deviation ≤3mm in X and Y direction, and ≤5mm in Z direction.

A Study on Position Measurement System Using Laser Range Finder and its Application for Construction Work

2012 ◽  
Vol 24 (1) ◽  
pp. 226-234 ◽  
Author(s):  
Fumihiro Inoue ◽  
◽  
Takeshi Sasaki ◽  
Xiangqi Huang ◽  
Hideki Hashimoto ◽  
...  
Keyword(s):  
Measurement System ◽  
Low Cost ◽  
Least Square ◽  
Laser Range Finder ◽  
Range Finder ◽  
Construction Work ◽  
Position Measurement ◽  
Laser Range ◽  
High Efficient ◽  
Center Position

This paper describes a study of high accuracy and low cost position measurement system using Laser Range Finder (LRF), and its application for construction pile work. Since the LRF is a sensor which can measure distance to surfaces of objects by radiating laser beams from itself and receiving the reflected ones, an obtained data from the LRF are nothing more than the contours of objects. In proposed system, the obtained data from LRF assumed the arc-shaped contours of the bar, the center position was analyzed introducing the least square method and maximum likelihood estimation. The error between the analysis and the measurement corresponds enough to the allowable accurate range. Additionally, improving the angular resolution of the LRF by using a pan unit, the highest accurate center position was able to be acquired. Applying this system to the construction work, the high accurate pile marking and the pile drive positioning were recognized. Since this measurement was achieved by only a worker and the position and direction of the worker was easily found, the high efficient and short term works were surely performed.

Stitching of 3-D Image Position Measurement System with 1-D Direction-sensitive Devices

2001 ◽  
Vol 13 (6) ◽  
pp. 651-658
Author(s):  
Saied Mohamed ◽  
◽  
Toyomi Fujita ◽  
Masanori Idesawa
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Bright Spot ◽  
Position Measurement ◽  
Position Sensing ◽  
Sensing System ◽  
Mathematical Techniques ◽  
Image Position

We previously proposed practical calibration of 3-D bright spot position measurement system using 3 1-D direction-sensitive devices. The proposed calibration enables easy setup of 1-D direction-sensitive devices to construct 3-D position sensing system; then the applicable fields and circumstances are extended extremely. The method is based on mathematical techniques which the situation of each 1-D mark direction sensitive device is determined automatically by referencing coordinates with 7 referential points. Here, we are proposing the stitching of measurement space of high-precision 3-D position sensing with 1-D mark direction-sensitive devices to expand measured space further. Our proposed method is essentially iterative application of calibration: reference coordinates are translated and rotated to include both adjacent measurement spaces step by step, calibration is executed, and the position and situation of each 1-D direction-sensitive device are found systematically.

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