基于高頻變壓器擬磁飽和的磁致伸縮索力測量研究
發(fā)布時間：2019-02-20 10:10
【摘要】：鋼纜索有著受力大、韌性好、硬度高、抗震能力強、重量小等特點,現(xiàn)已被長久的運用于工程設備(船舶、橋梁、建筑、水利)與民用設備(防護欄、樓板、地基)中。常見的鋼纜索應用有:體育館,斜拉橋,懸索橋,纜索護欄(邊坡防護網(wǎng))。在鋼纜索使用過程中,它是承受中心的主力,是擔負整個橋梁結(jié)構(gòu)的重心。如果發(fā)生鋼纜索受力過大、內(nèi)部腐化、纜索自身故障、衰敗等原因而使得鋼纜索蹦裂,這必將釀成無法預料的惡果。因而,鋼纜索的張力或是拉力都必須精而準的測量。另一方面,長久監(jiān)測鋼纜索的變化情況,既可以快速也可以準確的進行維護,也可使鋼纜索在使用過程中,達到最大使用年限,提高其自身價值。因此,在線監(jiān)測鋼纜索索力是判定拉索結(jié)構(gòu)穩(wěn)固狀態(tài)的有效方法,其中磁致伸縮索力測量法成為了國內(nèi)外探究的重點。針對磁致伸縮索力測量的原理,現(xiàn)有研究者激勵磁場強度的選取處于材料的最大磁導率附近。但實際上磁場強度處于最大磁導率附近所產(chǎn)生的信號變化小、磁導率變化小不利于實驗的觀察和實驗結(jié)果的分析。因此磁場強度應選取在輸出信號和磁導率的變化率最大的擬磁飽和區(qū)附近。此時常采用頻率飽和的方式使其磁場強度工作在擬磁飽和區(qū)。為使頻率達到飽和,常用高頻變壓器的方式來使其達到飽和。所以十分有必要建立基于高頻變壓器擬磁飽和的磁致伸縮索力測量的理論體系,完成基于高頻變壓器擬磁飽和磁致伸縮索力測量的拉力實驗。本文在綜合了目前國內(nèi)外的索力測量方法的基礎(chǔ)上,提出了一種基于高頻變壓器擬磁飽和磁致伸縮索力測量的方法,完成了基于高頻變壓器擬磁飽和磁致伸縮索力測量的理論研究,創(chuàng)建了實驗方案與平臺,完成了在交流激勵方式下拉力實驗研究。具體研究內(nèi)容如下:(1)通過介紹常用鋼絞線類型、實驗所用鋼絞線模型和磁導率變化量與鋼纜索索力的關(guān)系,得到纜索索力與磁導率變化(35)?成正比,并對磁導率的測量進行了完善的推導。(2)論文闡明了高頻變壓器的特性,原理與理想模型。并對高頻變壓器擬磁飽和時的現(xiàn)象和磁飽和產(chǎn)生的原因進行進一步的推導。得出在高頻變壓器擬磁飽和狀態(tài)下,如何進行磁化工作點的選取。(3)通過建立擬磁飽和的磁致伸縮索力理論模型,推導出纜索索力與溫度,感應電壓,材料磁導率,空氣間隙等參數(shù)的關(guān)系。并在擬磁飽和狀態(tài)下,總結(jié)了感應電壓與拉力的關(guān)系,理論表明:在交流激勵方式下,可通過測量輸出感應電壓求出加載拉力,并且感應電壓與加載拉力近似呈線性關(guān)系。(4)設計了基于高頻變壓器擬磁飽和的磁致伸縮索力測量的拉力實驗方案,完成了在交流激勵方式下的拉力實驗。用實驗證實了感應電壓與拉力基本呈線性關(guān)系。最后總結(jié)了全文和本文后續(xù)工作展望。
[Abstract]:Steel cables have been used in engineering equipment (ship, bridge, building, water conservancy) and civil equipment (fence, floor, foundation) for a long time because of the characteristics of large force, good toughness, high hardness, strong earthquake resistance and low weight. Common steel cable applications include: gymnasium, cable-stayed bridge, suspension bridge, cable fence (slope protection net). In the process of using steel cable, it is the main force of bearing center and the center of gravity of the whole bridge structure. If the steel cable is subjected to too much force, internal corruption, cable itself failure, decay and other reasons make the steel cable jump and crack, this will lead to unpredictable consequences. Therefore, the tension or tension of the steel cable must be measured accurately and accurately. On the other hand, monitoring the change of steel cable for a long time can not only quickly and accurately maintain the steel cable, but also make the steel cable reach the maximum service life in the process of using, and improve its own value. Therefore, on-line monitoring cable force is an effective method to determine the stable state of cable structure, and magnetostrictive cable force measurement method has become the focus of domestic and foreign research. According to the principle of magnetostrictive cable force measurement, the selection of magnetic field intensity is near the maximum permeability of the material. However, in fact, the signal produced by the magnetic field intensity near the maximum permeability changes little, and the change of permeability is not conducive to the observation of the experiment and the analysis of the experimental results. Therefore, the magnetic field intensity should be chosen near the quasi-magnetic saturation region where the output signal and the maximum change rate of permeability are obtained. In this case, frequency saturation is often used to make the magnetic field intensity work in the quasi-magnetic saturation region. To saturate the frequency, high-frequency transformers are often used to saturate them. Therefore, it is necessary to establish a theoretical system of magnetostrictive cable force measurement based on quasi magnetic saturation of high frequency transformer, and complete the tension experiment based on high frequency transformer quasi magnetic saturation magnetostrictive cable force measurement. On the basis of synthesizing the current cable force measurement methods at home and abroad, this paper presents a method based on quasi-magnetically saturated magnetostrictive cable force measurement for high-frequency transformers. The theoretical research on the measurement of magnetostrictive cable force based on quasi magnetically saturated magnetostrictive cable of high frequency transformer is completed, the experimental scheme and platform are established, and the experimental research of tensile force under AC excitation mode is completed. The specific research contents are as follows: (1) the cable force and magnetic permeability change are obtained by introducing the commonly used steel strand types, the model of the steel strand used in the experiment and the relationship between the change of magnetic permeability and cable force (35)? It is proportional to each other, and the measurement of permeability is derived. (2) the characteristics, principle and ideal model of high frequency transformer are expounded in this paper. The phenomenon of quasi-magnetic saturation in high frequency transformer and the cause of magnetic saturation are further deduced. It is concluded that how to select the magnetization working point under the condition of quasi magnetic saturation of high frequency transformer. (3) by establishing the magnetostrictive cable force model of quasi magnetic saturation, the cable force and temperature, the inductive voltage, the permeability of the material are derived. The relationship between air clearance and other parameters. In the condition of quasi magnetic saturation, the relationship between inductive voltage and pull force is summarized. The theory shows that the load tension can be obtained by measuring the output inductive voltage under AC excitation mode. And the inductive voltage is approximately linearly related to the loading tension. (4) an experimental scheme of magnetostrictive cable force measurement based on quasi magnetic saturation of high frequency transformer is designed, and the tension experiment under AC excitation mode is completed. The linear relationship between inductive voltage and tensile force is confirmed by experiments. Finally, the paper summarizes the full text and the future work of this paper.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG115.5
本文編號：2427081
[Abstract]:Steel cables have been used in engineering equipment (ship, bridge, building, water conservancy) and civil equipment (fence, floor, foundation) for a long time because of the characteristics of large force, good toughness, high hardness, strong earthquake resistance and low weight. Common steel cable applications include: gymnasium, cable-stayed bridge, suspension bridge, cable fence (slope protection net). In the process of using steel cable, it is the main force of bearing center and the center of gravity of the whole bridge structure. If the steel cable is subjected to too much force, internal corruption, cable itself failure, decay and other reasons make the steel cable jump and crack, this will lead to unpredictable consequences. Therefore, the tension or tension of the steel cable must be measured accurately and accurately. On the other hand, monitoring the change of steel cable for a long time can not only quickly and accurately maintain the steel cable, but also make the steel cable reach the maximum service life in the process of using, and improve its own value. Therefore, on-line monitoring cable force is an effective method to determine the stable state of cable structure, and magnetostrictive cable force measurement method has become the focus of domestic and foreign research. According to the principle of magnetostrictive cable force measurement, the selection of magnetic field intensity is near the maximum permeability of the material. However, in fact, the signal produced by the magnetic field intensity near the maximum permeability changes little, and the change of permeability is not conducive to the observation of the experiment and the analysis of the experimental results. Therefore, the magnetic field intensity should be chosen near the quasi-magnetic saturation region where the output signal and the maximum change rate of permeability are obtained. In this case, frequency saturation is often used to make the magnetic field intensity work in the quasi-magnetic saturation region. To saturate the frequency, high-frequency transformers are often used to saturate them. Therefore, it is necessary to establish a theoretical system of magnetostrictive cable force measurement based on quasi magnetic saturation of high frequency transformer, and complete the tension experiment based on high frequency transformer quasi magnetic saturation magnetostrictive cable force measurement. On the basis of synthesizing the current cable force measurement methods at home and abroad, this paper presents a method based on quasi-magnetically saturated magnetostrictive cable force measurement for high-frequency transformers. The theoretical research on the measurement of magnetostrictive cable force based on quasi magnetically saturated magnetostrictive cable of high frequency transformer is completed, the experimental scheme and platform are established, and the experimental research of tensile force under AC excitation mode is completed. The specific research contents are as follows: (1) the cable force and magnetic permeability change are obtained by introducing the commonly used steel strand types, the model of the steel strand used in the experiment and the relationship between the change of magnetic permeability and cable force (35)? It is proportional to each other, and the measurement of permeability is derived. (2) the characteristics, principle and ideal model of high frequency transformer are expounded in this paper. The phenomenon of quasi-magnetic saturation in high frequency transformer and the cause of magnetic saturation are further deduced. It is concluded that how to select the magnetization working point under the condition of quasi magnetic saturation of high frequency transformer. (3) by establishing the magnetostrictive cable force model of quasi magnetic saturation, the cable force and temperature, the inductive voltage, the permeability of the material are derived. The relationship between air clearance and other parameters. In the condition of quasi magnetic saturation, the relationship between inductive voltage and pull force is summarized. The theory shows that the load tension can be obtained by measuring the output inductive voltage under AC excitation mode. And the inductive voltage is approximately linearly related to the loading tension. (4) an experimental scheme of magnetostrictive cable force measurement based on quasi magnetic saturation of high frequency transformer is designed, and the tension experiment under AC excitation mode is completed. The linear relationship between inductive voltage and tensile force is confirmed by experiments. Finally, the paper summarizes the full text and the future work of this paper.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG115.5
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