pipe waves 中文意思是什麼
pipe waves
解釋
管道波-
Laser, ultrasonic beam and microwave are used in non contacting level measuring systems. laser systems suffer from dirt, ultrasonic sensors are strongly affected by changes of the velocity of sound and usually a pipe is needed to couple the ultrasonic waves into the liquid tank, which is difficult when there is a high pressure or when explosion protection is necessary
壓力式液位測量系統原理簡單、成本低，但測量精度和應用場合有一定的局限性，超聲液位儀精度較高，但設備復雜，一般需要用導管將超聲波傳到被測的液體中，因而安裝維護較麻煩，激光測距系統對環境要求嚴格。 -
The temperature fields and the surface rayleigh waves generated by a pulsed laser in a thick al pipe are analysed by using a finite element method
摘要利用有限元方法數值模擬了脈沖激光作用於厚鋁管時產生的溫升以及由此溫升而產生的表面瑞利波的情況。 -
Finally, some important conclusions were drawn, that is, using distributed pzt transducers, ultrasonic guided waves are generated and received in a pipe. usually, there are many different modes of guided wave propagating in the pipe and these modes are generally dispersive, the specific exciting signal of a harming windowed toneburst with a central frequency of 70khz for decreasing the effect of dispersion was selected. and guided wave are generated using 16 distributed pzt transducers in a circumferential direction for suppressing flexural modes
首先，對當前本課題研究領域的進展作出綜述，並簡要介紹與超聲導波技術相關的理論基礎；其次，建立了一套有效的實驗裝置，在此實驗裝置基礎上，重點研究了採用分散式pzt傳感器在管中激勵和接收特定模態超聲導波的方法：根據在管狀波導中傳播的超聲波具有頻散現象及多模態特徵，選擇具有單一頻率的特定信號激勵超聲導波，使其頻散最小；同時採用分散式傳感器抑制不同模態的波型。 -
An alternative to traditional pipe detection method is to excite stress waves, which can propagate along the pipe, and to monitor the response of the pipe for changes in the received signal at some remote positioa an ultrasonic inspection technique using guided waves was applied to detect and determine the exact location of flaws in long steel pipes
而傳統無損超聲檢測技術是單點檢測，因而，在檢測長距離管道時，這種方法遇到很大困難。而利用縱向超聲導波檢測管道缺陷，激勵導波沿管道傳播，通過監測管道回波的變化，達到一次檢測數十米的管道範圍，並且是全范圍檢測。 -
First, we introduce the development of this research field, and review the relative theories and basis on ultrasonic guided waves and development of transducer. subsequently, we depict in detail the prosess of the development of guided - waves transducer, based on the particularity of object to be detected - pip eline and some relative manufacture techniques of transducer. and we have made 24 guided - waves transducers and a mechanical device with which we can mount transducers on a pipe
首先，本文對國內外本課題研究領域的進展作了綜述，並簡要介紹了與超聲導波技術和探頭研製相關的理論基礎；其次，根據檢測對象? ?管道的特殊性，結合常規探頭的製造技術，詳細介紹了超聲導波探頭的研製過程，製作了24個超聲導波探頭和一個用於把探頭在管道上固定的機械裝置，並且對探頭的一些性能參數進行了數值模擬。 -
Finally, we conduct the experiments of generating and receiving guided waves on a pipe with the transducer system we have developed in our lab. the result of these experiments indicates that the transducer system we have developed can effectively generate and receive special modes of guided waves we need, and restrain the guided wave modes that we do n ' t need. it is hopeful that our guided - waves transducer system can be used in the testing of pipes " flaw
最後，在實驗室中進行探頭在管道中激勵接收超聲導波的實驗，實驗結果表明，本文研製的探頭系統能夠在管道中有效地激勵和接收所需的導波模態，並且能夠抑制一些不希望出現的導波模態，有望用於管道缺陷的檢測。
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