Influential factors for noncontact measurement method of vibration stress using multiple laser displacement sensors

2022 ◽  
Vol 151 ◽  
pp. 106942
Author(s):  
Akira Maekawa ◽  
Michiyasu Noda ◽  
Masanori Shintani ◽  
Michiaki Suzuki
Keyword(s):  
Measurement Method ◽  
Influential Factors ◽  
Noncontact Measurement ◽  
Displacement Sensors ◽  
Vibration Stress

Noncontact Measurement Method of Vibration Stress Using Optical Displacement Sensors for Piping Systems in Nuclear Power Plants

2015 ◽  
Vol 1 (3) ◽  
Author(s):  
Akira Maekawa ◽  
Tsuneo Takahashi ◽  
Takashi Tsuji ◽  
Michiyasu Noda
Keyword(s):  
Nuclear Power ◽  
Measurement Method ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Vibration Measurement ◽  
Piping System ◽  
Noncontact Measurement ◽  
Displacement Sensors ◽  
Optical Displacement ◽  
Vibration Stress

In nuclear power plants, vibration stress of piping is frequently measured to prevent the occurrence of fatigue failure. A simpler and more efficient measurement method is desired for rapid integrity evaluation of piping. In this study, a method to measure vibration stress in a noncontact manner using optical displacement sensors is presented and validated. The proposed method estimates vibration-induced stress of small-bore piping directly using noncontact sensors based on a light-emission diode. First, the noncontact measurement method was proposed, and the measurement instrument based on the proposed method was developed for the validation. Next, vibration measurement experiments using the instrument were conducted for a mock-up piping system and an actual piping system. The measurement results were compared with the values measured by the conventional method of known accuracy using strain gauges. From this comparison, the proposed noncontact measurement method was demonstrated to be able to provide sufficient accuracy for practical use.

scholarly journals Study on applicability of a contactless measurement method for vibration stress using laser displacement sensors

2015 ◽  
Vol 81 (831) ◽  
pp. 15-00195-15-00195 ◽  
Author(s):  
Akira MAEKAWA ◽  
Michiyasu NODA ◽  
Masanori SHINTANI ◽  
Michiaki SUZUKI
Keyword(s):  
Measurement Method ◽  
Contactless Measurement ◽  
Displacement Sensors ◽  
Vibration Stress

scholarly journals Measurement system for special surface mapping using miniature displacement sensors

2018 ◽  
Vol 157 ◽  
pp. 05023
Author(s):  
Martyna Zowade ◽  
Maciej Bodnicki
Keyword(s):  
Computer Program ◽  
Signal Analysis ◽  
Measurement Method ◽  
Variable Number ◽  
3D Printer ◽  
Special Design ◽  
Surface Mapping ◽  
Displacement Sensors ◽  
Special Surface ◽  
Voltage Signal

The aim of the work was to design a special system for measurements of elements with repetitive geometry or assemblies with repeating components, set in a linear patterns. The main focus was based on developing a computer program for signal analysis from variable number of miniature displacement sensors. It was set that the response for displacement of measuring tip from each sensor was a 0-5 V voltage signal with possibility of using different type of sensors. Requirements were determined based on projected measurement method. A special design of sensor was made for testing the computer program. If the characteristics of the sensor is known, it is possible to compute the type A evaluation of uncertainty. The results are presented in XY chart on computer screen. The program allows the user to choose any number of the sensors and determine the distance between them. Also, the possibility of calibration of sensors’ set was provided. The test were conducted on a prototype handle for sensors, made on a 3D printer.

Optoelectronic noncontact measurement method for detecting the diameter of a bullet

2007 ◽  
Author(s):  
Xun Zhou ◽  
Hongtao Zhang ◽  
Tianxiang Sun ◽  
Qiugui Wang ◽  
Xuhua Zhai
Keyword(s):  
Measurement Method ◽  
Noncontact Measurement

Noncontact Measurement Method for High-Frequency Impedance of Load at the End of Wire Harness

2019 ◽  
Vol 61 (1) ◽  
pp. 271-278
Author(s):  
Tomohiro Yoshikawa ◽  
Jianqing Wang ◽  
Yasunori Oguri ◽  
Makoto Tanaka ◽  
Michihira Iida
Keyword(s):  
High Frequency ◽  
Measurement Method ◽  
Noncontact Measurement ◽  
Wire Harness

A New Concept of Optical Encoder Displacement Sensors: Gray Encoding Patterns and a Curve Fitting Method

2006 ◽  
Vol 505-507 ◽  
pp. 349-354
Author(s):  
Yeh Fen Fu ◽  
Lih Horng Shyu ◽  
Y.T. Chen ◽  
Wen Yuh Jywe ◽  
C.H. Liu
Keyword(s):  
Harmonic Function ◽  
Curve Fitting ◽  
Measurement Method ◽  
Single Frequency ◽  
Gray Level ◽  
Optical Encoder ◽  
Displacement Sensors ◽  
Fitting Method ◽  
Curve Fitting Method ◽  
Frequency Harmonic

A new optical encoder system is presented for displacement measurement by the curve fitting method. In this paper, another pondering model is based on the previous development. That is the new measurement method using a homemade periodical gray level code, which can be used to replace the traditional doublet grating. A high precision is achieved by a fitting method with one single-frequency harmonic function. The experiment result shows that the concept is feasible.

scholarly journals High Frequency Modal Testing of the Multiblade Packets Using a Noncontact Measurement and Excitation System

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
C. H. Liu ◽  
C. Zang ◽  
F. Li ◽  
E. P. Petrov
Keyword(s):  
High Frequency ◽  
Measurement Method ◽  
Natural Frequencies ◽  
Spectral Lines ◽  
Modal Testing ◽  
Frequency Resolution ◽  
Mode Shapes ◽  
Finite Model ◽  
Frequency Range ◽  
Noncontact Measurement

High cycle failure of blades and vanes caused by the vibration is one of the major causes reducing the lifetime of turbomachines. For multiblade packets, the failure may occur at vibrations with high frequencies that can reach up to tens of kHz. The experimental modal testing of blades is crucial for the validation of numerical models and for the optimization of turbomachine design. In this paper, the test rig and procedure for measurements of dynamic characteristics of lightweight multiblade packets in wide and high frequency ranges are developed. The measurements are based on a noncontact excitation and noncontact measurement method, which allows the determination of the modal characteristics of the packets with high accuracy in wide frequency ranges. The responses of the multiblade packets are measured using a Scanning Laser Doppler Vibrometry (SLDV), while vibrations are excited by the acoustic excitation technique. Modal tests of the blade packet comprising 18 vane blades connected by shrouds are performed. The measurements are performed within the high frequency range of 0–30 kHz, and the natural frequencies and mode shapes are obtained for first 97 modes. To capture the complex high frequency blade mode shapes, each blade in the packet is scanned over 25 reference points uniformly distributed over the blade concave surface. In order to obtain the high frequency resolution, the frequency range used for the measurements is split into several frequency intervals accordingly to the number of spectral lines available in the used data acquisition system, and for each such interval, the test is performed separately. The finite model of the packet is created, and the numerical modal analysis is performed to compare the calculated natural frequencies and mode shapes with the experimental measurements. The comparison shows the satisfactory with those from finite element analysis. It illustrates the measurement method described in this work is effective and reliable.

Proposal of an Improved Contactless Measurement Method Using an Advanced LED Displacement Sensor for Vibration Stress of Piping Systems

2021 ◽  
Author(s):  
Akira Maekawa ◽  
Takashi Tsuji ◽  
Tsuneo Takahashi
Keyword(s):  
Mode Shape ◽  
Measurement Method ◽  
Previous Method ◽  
Measuring System ◽  
Displacement Sensor ◽  
Contactless Measurement ◽  
Piping System ◽  
Bending Mode ◽  
Piping Systems ◽  
Vibration Stress

Abstract The present paper proposes an improved contactless measurement method for vibration stress of piping systems, by which the measurement time is shorter and the measuring works are more simple. The proposed method includes two processes, in which the bending mode shape of piping vibration is identified by a transmission-type light emitting diode (LED) displacement sensor and the vibration stress is calculated based on beam theory using the approximated curve of the bending mode shape. The proposed method uses one advanced LED displacement sensor to measure the vibration stress though multiple conventional LED sensors must be used in the previous method developed by the authors. Therefore, the measuring system could be reduced in size and a light-weight and portable measurement instrument was developed. The measurement accuracy and reliability of the new method were validated by the vibration experiment using a mock-up piping system.

Extensive Analysis and Development of Straightness Measurement by Sequential-Two-Points Method

1986 ◽  
Vol 108 (3) ◽  
pp. 176-182 ◽  
Author(s):  
H. Tanaka ◽  
H. Sato
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Present System ◽  
Displacement Sensors ◽  
Extensive Analysis ◽  
Linear Increment

Characteristics of errors which might occur in the straightness measurement method due to sequential-two-points were investigated. The investigation made it clear that the slight discrepancies of alignment at the tip between two displacement sensors would be accumulated onto the portion of linear increment generally observed when the straightness is measured; the method of compensation is analytically shown. It is theoretically proposed that the error which might be introduced by the yaw of the tool post and is neglected by the present system can be evaluated by the measurement using sequential-three-points. It is also shown that the measurement system due to the sequential-two-points works stably even for the case when the work on the lathe is rotated. The cylindricity obtained by the measurement during the work rotation agrees well with that obtained by static measurements.

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