Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner
An expansion joint is mainly composed of bellows and other components; it is attached on a container shell or pipe to compensate for the additional stress caused by temperature differences and mechanical vibrations. In China, the expansion joint fatigue tests are often used to assess the quality of...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-02-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/20/4/1057 |
| _version_ | 1811278731025580032 |
|---|---|
| author | Yutu Yang Zengtao Chen Ying Liu Yuting Li Zhongkang Hu Binli Gou |
| author_facet | Yutu Yang Zengtao Chen Ying Liu Yuting Li Zhongkang Hu Binli Gou |
| author_sort | Yutu Yang |
| collection | DOAJ |
| description | An expansion joint is mainly composed of bellows and other components; it is attached on a container shell or pipe to compensate for the additional stress caused by temperature differences and mechanical vibrations. In China, the expansion joint fatigue tests are often used to assess the quality of products. After fatigue tests, convolution pitch will be changed. The amount of change is an important index that can be used to evaluate bellows expansion joints. However, the convolution pitch detection is mainly done manually and randomly by inspection agencies before shipping to the end users. This common practice is not efficient and is often subjective. This paper introduced a novel method for automatically detecting the change of the convolution pitch based on a laser line scanner and data processing technology. The laser line scanner is combined with a precision motorized stage to obtain the point cloud data of the bellows. After denoising and fitting, a peak-finding algorithm is applied to search for the crest of a convolution. The method to find the convolution pitch and the decision that needs to be made to ensure product eligibility are described in detail. A DN500 expansion joint is used as a sample to illustrate the efficiency of the system. The application of the technique intuitively allows a higher precision and relative efficiency in quality inspection of bellows expansion joints. It has also been implemented in the Special Equipment Safety Supervision and Inspection Institute of Jiangsu province with great success. |
| first_indexed | 2024-04-13T00:41:14Z |
| format | Article |
| id | doaj.art-6b3a2df4147c417886159f10010b7fe4 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T00:41:14Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6b3a2df4147c417886159f10010b7fe42022-12-22T03:10:08ZengMDPI AGSensors1424-82202020-02-01204105710.3390/s20041057s20041057Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line ScannerYutu Yang0Zengtao Chen1Ying Liu2Yuting Li3Zhongkang Hu4Binli Gou5College of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaDepartment of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, CanadaCollege of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Mechanical and Electrical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaAn expansion joint is mainly composed of bellows and other components; it is attached on a container shell or pipe to compensate for the additional stress caused by temperature differences and mechanical vibrations. In China, the expansion joint fatigue tests are often used to assess the quality of products. After fatigue tests, convolution pitch will be changed. The amount of change is an important index that can be used to evaluate bellows expansion joints. However, the convolution pitch detection is mainly done manually and randomly by inspection agencies before shipping to the end users. This common practice is not efficient and is often subjective. This paper introduced a novel method for automatically detecting the change of the convolution pitch based on a laser line scanner and data processing technology. The laser line scanner is combined with a precision motorized stage to obtain the point cloud data of the bellows. After denoising and fitting, a peak-finding algorithm is applied to search for the crest of a convolution. The method to find the convolution pitch and the decision that needs to be made to ensure product eligibility are described in detail. A DN500 expansion joint is used as a sample to illustrate the efficiency of the system. The application of the technique intuitively allows a higher precision and relative efficiency in quality inspection of bellows expansion joints. It has also been implemented in the Special Equipment Safety Supervision and Inspection Institute of Jiangsu province with great success.https://www.mdpi.com/1424-8220/20/4/1057bellows expansion jointlaser line scanners-g algorithmconvolution pitch detection |
| spellingShingle | Yutu Yang Zengtao Chen Ying Liu Yuting Li Zhongkang Hu Binli Gou Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner Sensors bellows expansion joint laser line scanner s-g algorithm convolution pitch detection |
| title | Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner |
| title_full | Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner |
| title_fullStr | Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner |
| title_full_unstemmed | Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner |
| title_short | Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner |
| title_sort | detection system for u shaped bellows convolution pitches based on a laser line scanner |
| topic | bellows expansion joint laser line scanner s-g algorithm convolution pitch detection |
| url | https://www.mdpi.com/1424-8220/20/4/1057 |
| work_keys_str_mv | AT yutuyang detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner AT zengtaochen detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner AT yingliu detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner AT yutingli detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner AT zhongkanghu detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner AT binligou detectionsystemforushapedbellowsconvolutionpitchesbasedonalaserlinescanner |