scholarly journals Automated Sound Intensity Measuremant With Robot And Intensity Probe

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Nikola Knežević ◽  
Miloš Bjelić ◽  
Kosta Jovanović
Keyword(s):  
Measurement Accuracy ◽  
Sound Intensity ◽  
High Accuracy ◽  
Intensity Measurement ◽  
Measurement Process ◽  
Sound Power ◽  
Robot Arm ◽  
Sound Sources ◽  
Complex Sound ◽  
Automatic Positioning

This paper presents the procedure for measuring the sound intensity. The procedure was realized in such a way that therobotic arm carries the intensity probe and performs automatic positioning at the appropriate measurement points. In order todetermine the deviation value, a comparison was performed of sound intensity measurement obtained using robot and the measurementmanually performed by two people. Also, the measurement process was repeated for both the automated and manual positioning of theprobe, which resulted in deviation values for these two types of measurements. The differences in the total sound power of the sourceobtained by automated and manual measurements of the sound intensity were also analyzed. Using a robot arm significantly facilitatesthe measurement process and achieves higher measurement accuracy. Such use of robots can be of interest in measuring the intensity ofsound of complex sound sources in a large number of points, where high accuracy of intensity measurement is required.

Uncertainty of sound power measurements of a reference sound source using the AHRI Standard 230 sound intensity method

2021 ◽  
Vol 263 (6) ◽  
pp. 641-647
Author(s):  
Curtis Eichelberger ◽  
Paul Bauch
Keyword(s):  
Training Program ◽  
Sound Source ◽  
Measurement Method ◽  
Sound Intensity ◽  
Intensity Measurement ◽  
Sound Power ◽  
Sound Sources ◽  
Scanning Method ◽  
Intensity Measurements ◽  
Power Measurements

The uncertainty of determining the sound power of HVAC equipment using the AHRI Standard 230 sound intensity measurement method is presented. Measurements of six different reference sound sources (RSS) at four different laboratories, by nineteen different individuals with four different instrumentation systems are presented. From 2004 through 2020, these measurements were performed as part of a training program at Johnson Controls HVAC test laboratories to qualify technicians and engineers on the use of sound intensity instrumentation. The results illustrate the reproducibility of sound intensity measurements using the scanning method of AHRI Standard 230.

scholarly journals High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2842 ◽  
Author(s):  
Wei Liu ◽  
Bing Liang ◽  
Zhenyuan Jia ◽  
Di Feng ◽  
Xintong Jiang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Measurement Accuracy ◽  
Characteristic Curve ◽  
Calibration Method ◽  
High Accuracy ◽  
Output Characteristic ◽  
Displacement Sensor ◽  
Support Vector ◽  
Displacement Sensors ◽  
Calibration Accuracy

High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to the advantages of non-contact sensing, compact volume, and resistance to harsh conditions. To solve the nonlinear characteristics of the sensors, a high-accuracy calibration method based on linearity adjustment is proposed for ECDSs in this paper, which markedly improves the calibration accuracy and then the measurement accuracy. After matching the displacement value and the output voltage of the sensors, firstly, the sensitivity is adjusted according to the specified output range. Then, the weighted support vector adjustment models with the optimal weight of the zero-scale, mid-scale and full-scale are established respectively to cyclically adjust the linearity of the output characteristic curve. Finally, the final linearity adjustment model is obtained, and both the calibration accuracy and precision are verified by the established calibration system. Experimental results show that the linearity of the output characteristic curve of ECDS adjusted by the calibration method reaches over 99.9%, increasing by 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μ m to 1–10 μ m in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement.

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