http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104849353-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N29-32 |
| filingDate | 2015-04-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2018-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2018-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-104849353-B |
| titleOfInvention | Spiral welded pipe twist and warping guided wave detecting method based on wave beam delays time to control and device |
| abstract | The invention discloses a kind of, and the spiral welded pipe based on wave beam delays time to control twists and warps guided wave detecting method and device.The guided wave Dispersion of spiral welded pipe is calculated by semi-analysis finite element method, and then the twist and warping guided wave frequency and its velocity of wave of parallel spiral weld seam is calculated；Multiple magnetostrictive transducers are along the circumferential direction equally spaced to composition circular magnetostrictive twist and warping wave guide energy converter array, each communication channel delay encourages guided wave, it propagates in an axial direction after encountering defect reflection, each channel reception of wave guide energy converter array is twisted and warped by circular magnetostrictive, detection signal is obtained after synthesis, and then defective locations are determined according to defect waves packet；Best twist and warping Guided waves frequency and corresponding signal can be determined according to signal-to-noise ratio by frequency sweep.The phenomenon that persistently appearing in echo this invention removes spiral weld signal when annular integral type magnetostrictive transducer carries out Guided waves, improves the signal-to-noise ratio of guided wave echo, small flaw indication is made to be more prone to extract. |
| priorityDate | 2015-04-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 16.