scholarly journals Systemy umożliwiające identyfikację upadku z wysokości

2021 ◽  
Vol 601 (10) ◽  
pp. 17-21
Author(s):  
Marcin Jachowicz ◽  
◽  
Grzegorz Owczarek
Keyword(s):  
Image Analysis ◽  
Measuring System ◽  
Test Results ◽  
Acceleration Sensors ◽  
Calibration And Verification

The article discusses two types of systems developed at CIOP-PIB, which enable the identification of human falls from a height. The operation of the first system is based on an accelerometric measuring system implemented in the hip belt, which is an element of the equipment protecting against falls from a height. The operation of the second system is based on the analysis of the recorded video. The methods and results of calibration and verification tests of both designed systems, which were used for the preliminary tests, were presented. During these tests, the participant performed specific exercises: sitting down and simulating falling. The comparison of the test results showed a high convergence between the values measured with the acceleration sensors and the values obtained on the basis of the image analysis. The described systems can therefore be used for fall dentification and as initiators of devices for dynamic shortening of the fall path, which will reduce the forces acting on a person during restraining his fall from a height.

Limitations of a 3-D Image Analysis-Based Particle Size Measuring System for Wood Particle Dimension Measurement

2018 ◽  
Vol 50 (3) ◽  
pp. 358-362
Author(s):  
Jan T Benthien ◽  
Jan Ludtke ◽  
Rainer Friehmelt ◽  
Michael Schafer
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Wood Particle ◽  
Measuring System ◽  
Dimension Measurement ◽  
Particle Dimension

Measurement and Analysis on Transient Thermal Characteristics of High Speed Motorized Spindle

2011 ◽  
Vol 52-54 ◽  
pp. 2021-2026
Author(s):  
Gui Ling Deng ◽  
Can Zhou
Keyword(s):  
High Speed ◽  
Thermal Deformation ◽  
Thermal Characteristics ◽  
Measuring System ◽  
Test Results ◽  
Motorized Spindle ◽  
Measurement And Analysis ◽  
Turning Center ◽  
Transient Thermal ◽  
Deformation Compensation

Thermal deformation is an important factor to affect the accuracy of the motorized spindle, the core component of high-speed machine tool. To understand the spindle system transient thermal characteristics of the high-speed turning center CH7516GS, some high-precision sensors and high-frequency data acquisition system is used to establish the temperature and displacement measuring system. The thermal deformation compensation model is established on the basis of the experimental test results.

Surface Displacement Measurement of Soil Mass by White Light Digital Image Analysis in Frequency Domain

2014 ◽  
Vol 915-916 ◽  
pp. 1234-1237
Author(s):  
Jun Jun Li ◽  
Xin Wei Yang ◽  
Wen Guang Shi
Keyword(s):  
Image Analysis ◽  
Frequency Domain ◽  
Digital Image ◽  
White Light ◽  
Digital Image Analysis ◽  
Surface Displacement ◽  
Soil Mass ◽  
Measuring System ◽  
Surface Displacements ◽  
Simple Measuring

The surface displacement of soil mass is an important standard for safety in civil engineering. In this paper, white light digital image analysis in frequency domain is introduced tomeasure surface displacement of soil mass. This method has the characteristics of whole-field, non-contact measurement and the simple measuring system and can obtain displacements by frequency domination correlation arithmetic. Surface displacements of soil mass are obtained by white light digital image analysis in frequency domain. Comparing the experimental results and the theoretical values, the little error exists and the usefulness of this method is certified.

scholarly journals Image Analysis of Eccentric Photorefraction

10.14311/546 ◽  
2004 ◽  
Vol 44 (2) ◽  
Author(s):  
J. Dušek ◽  
M. Dostálek
Keyword(s):  
Image Analysis ◽  
Data Analysis ◽  
Eye Movement ◽  
Measuring System ◽  
Video Sequences ◽  
Measuring Methods ◽  
Special System ◽  
Whole Process

This article deals with image and data analysis of the recorded video-sequences of strabistic infants. It describes a unique noninvasive measuring system based on two measuring methods (position of I. Purkynje image with relation to the centre of the lens and eccentric photorefraction) for infants. The whole process is divided into three steps. The aim of the first step is to obtain video sequences on our special system (Eye Movement Analyser). Image analysis of the recorded sequences is performed in order to obtain curves of basic eye reactions (accommodation and convergence). The last step is to calibrate of these curves to corresponding units (diopter and degrees of movement).

Effects of Probe Marks on Shear Test of Copper Ball Bonds in Two Pad Aluminum Thicknesses

2016 ◽  
Vol 2016 (1) ◽  
pp. 000219-000226 ◽  
Author(s):  
Priscila Brown ◽  
Rachel Wynder ◽  
Dustin Tenney ◽  
Stevan Hunter
Keyword(s):  
Image Analysis ◽  
Shear Force ◽  
Shear Test ◽  
Physical Factors ◽  
Microscopic Image ◽  
Test Results ◽  
Contact Areas ◽  
Ball Bonds ◽  
Optical Microscopic Image ◽  
Bond Pads

Abstract This paper continues the work of reference [1], evaluating shear test results of Cu ball bonds over a variety of probe marks in two different pad aluminum (Al) thicknesses (0.8μm and 3μm). The presence of invasive probe marks on thick Al bond pads lowers certain shear force results.. Lower values of shear force imply reduced Cu bond reliability. Physical factors are investigated relating to poor intermetallic (IMC) formation in the Cu wirebond and bond shear force. Optical microscopic image analysis of Cu bonds, bond contact areas and Al “splash” are studied for correlation with the shear test results. Percent IMC coverage of bond contact areas decrease when invasive probe marks are present beneath the bond, which in turn may reduce the shear force. Probe mark features are studied to discover the characteristics of greatest influence on % IMC coverage and shear test values in each of the pad metal thicknesses.

Faults Diagnosis of Converter Transformer Based on the Vibration Method

2013 ◽  
Vol 712-715 ◽  
pp. 2101-2106
Author(s):  
Hong Cui
Keyword(s):  
Measuring System ◽  
Iron Core ◽  
Transmission Route ◽  
Test Results ◽  
Vibration Method ◽  
Vibration Condition ◽  
Faults Diagnosis ◽  
Vibration Measuring

The vibration of windings and iron core causes the overall vibration of the transformer. Significant changes of transformer vibration condition will take place when the windings or core has fault, so the vibration method can be used to diagnose the transformer's potential fault. The characteristics and transmission route of the transformers' vibration were analyzed. The vibration of a certain transformer in converter station was picked up, using vibration measuring system. The test results aree analyzed comparatively and maintenance suggestion was proposed.

Research on Sucker Rod Displacement Measuring Technology Based on Double Integral of Acceleration

2013 ◽  
Vol 718-720 ◽  
pp. 460-465
Author(s):  
Wang Zhan ◽  
Ming Long Xu ◽  
Bo Feng ◽  
Zeng Yong An
Keyword(s):  
Digital Filter ◽  
Serial Communication ◽  
Practical Work ◽  
Measuring System ◽  
Acceleration Process ◽  
Test Results ◽  
Double Integral ◽  
Process Data ◽  
Sucker Rod

In allusion to the disadvantages of sucker rod displacement measuring technologies at present, we introduce an inertial measuring technology in which the design of acceleration measuring system, the design of IIR digital filter and double integral algorithm play significant roles. Through combination of hardware and software, the embedded measuring system was developed to measure the acceleration, process data and realize the serial communication. In our practical work, some chips were used in this system, eg 1221L-002, ADS1259, MSP430F1611, MAX202, etc. The test results showed that the accuracy of the measuring system reached to 5%, which met the request for oilfield.

REDUCING BUG-HOLES ON TUNNEL LINING CONCRETE BY USING COVERING SHEETS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Sari Harada ◽  
Tomoyuki Maeda ◽  
Masayuki Hirano ◽  
Isamu Yoshitake
Keyword(s):  
Experimental Investigation ◽  
Image Analysis ◽  
Concrete Surface ◽  
Tunnel Lining ◽  
Coated Steel ◽  
Test Results ◽  
Sheet Materials ◽  
Tunneling Method ◽  
Experimental Parameters ◽  
Entrapped Air

This study focused on bug-holes on sidewalls of tunnel lining concrete. The bug-holes of lining concrete may negatively affect aesthetics and durability of NATM (New Austrian Tunneling Method) tunnels. Most bug-holes appeared on concrete surface are generated from entrapped air during consolidating concrete. In particular, the sidewall of tunnel lining is constructed with negative angles, so bug-holes are often observed on the sidewall. Seven concrete specimens were prepared to simulate conventional tunnel lining. In the experimental investigation, breathable-waterproof material sheets and permeable sheets were used. The primary experimental parameters are (a) covering-sheet materials and (b) form surfaces such as ceramic-coated steel with grooves. The study examined bug-hole distributions in the concrete specimens using the various sheets. The bug-hole distributions were quantified by using an image analysis developed in this study. The test results show that quantity of bug-holes of concrete using the sheets is lower than the quantity of concrete without sheets. It was noteworthy that the bug-holes were hardly observed in the test using the form covered with the permeable sheets.

THE ABRASION OF AL-SI COATINGS WITH DIFFERENT SILICON CRYSTAL MORPHOLOGY, APPLIED IN AUTOMOTIVE SILENCERS

Tribologia ◽  
2016 ◽  
Vol 269 (5) ◽  
pp. 209-218
Author(s):  
Anna WRÓBEL-KNYSAK ◽  
Barbara KUCHARSKA
Keyword(s):  
Image Analysis ◽  
Crystal Morphology ◽  
Silicon Crystal ◽  
Wear Test ◽  
Scratch Test ◽  
Test Method ◽  
Test Results ◽  
Silicon Crystals ◽  
Analysis Technique ◽  
Pre Treatment

This paper compares the abrasibility of aluminium-silicon coatings with silicon crystals of various forms. The tests were performed on Al-Si coatings with the chemical comp67890-osition corresponding to that of hypoeutectic and peritectic silumins (6-10wt% Si), manufactured by hot-dipping on type X2CrTi12 steel and by cold cladding with 60% cold reduction on AlMn1Cu alloy. The hot-dip coatings deposited on X2CrTi12 steel were investigated as made and after a two-stage heat treatment: 420oC/2h/water and 120oC/2h/air. The morphology, shape, and size of silicon crystals in the coatings were studied under a microscope and with the image analysis technique (determining the shape factor among other parameters). Image analysis was also applied to the evaluation of abrasive wear resistance of the coatings using a ball wear test. Their adhesion strength was tested with the scratch test method. The test results indicated that the change in Al-Si coating silicon crystal morphology (from large sharp edged and needle-like to smaller rounded particles) was heat induced, which, compared to the pre-treatment condition, lowered abrasion resistance values and produced a more uniform abrasion loss. This condition was regarded as more desirable in terms of maintaining the coating continuity during drawing, with no risk of spalling. It was also demonstrated that clad Al-Si coatings could provide an alternative solution for the widely used hot dip coatings on steel sheet.

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