A Soft Sensing Method for Internal Temperature of Traveling Wave Tube Based on Finite Element Model

Abstract

The invention discloses a soft measurement method for the internal temperature of a traveling wave tube based on a finite element model. The multi-point temperature values ​​of the shell of the traveling wave tube are used as auxiliary variables to establish a finite element soft measurement thermal model of the traveling wave tube. variables, derive the objective function of the sum of the squares of errors between the multi-point temperature measurement values ​​of the tube shell and the temperature simulation values ​​of the corresponding points of the TWT finite element thermal model, solve it with an iterative algorithm, and obtain the optimal solution of heat source distribution, and finally optimize the heat source distribution The solution is loaded into the finite element thermal model of the traveling wave tube, and the soft sensor value of the internal temperature of the traveling wave tube is obtained through finite element simulation calculation. The invention breaks through the traditional detection limitation, avoids a series of complicated problems caused by placing a temperature sensor inside the traveling wave tube, has convenient measurement, low implementation cost, and can be applied to the detection of a large number of traveling wave tubes.

Description

technical field [0001] The invention relates to a method for soft measurement of the internal temperature of a traveling wave tube, which belongs to the field of thermal state monitoring and analysis of the traveling wave tube. Background technique [0002] As a high-power broadband microwave source and an important microwave signal amplifier, traveling wave tubes are used in many fields, and have become important microwave electronic devices for electronic equipment such as radar, electronic countermeasures, and satellite communications, and have an irreplaceable position. In national defense equipment, traveling wave tubes are known as the "heart" of weapons and equipment, and are very important basic equipment for national defense. The application field and importance of the traveling wave tube determine that it must have very high stability and reliability, which is directly related to the service life of related equipment. [0003] The temperature distribution and heat...

AI Technical Summary

Problems solved by technology

However, serious difficulties were encountered in the real-time measurement of the temperature inside the TWT

Because the traveling wave tube is a high-end precision device, its internal electromagnetic field environment is extremely complex. If you place a temperature sensor in it, you will encounter the following difficulties: on the one hand, the sensor is likely to be affected by the high-speed electron beam and cannot be measured; On the one hand, the sensor may also interfere with the distribution of the electron beam and electromagnetic field inside the traveling wave tube, which directly causes the traveling wave tube to fail to work normally.

Even if the traveling wave tube can still be used normally after the temperature sensor is installed, the traveling wave tube is a precision device designed according to strict requirements. To place the temperature sensor inside the traveling wave tube, it needs to be opened and reassembled after installation, or It needs a specially customized traveling wave tube to realize it, which has high process requirements, is difficult to implement, and the implementation cost is high, and these methods are also difficult to be extended to the detection of large quantities of traveling wave tubes

TWT designers suffer from the lack of convenient and effective measurement methods for the internal temperature field of TWT, and cannot intuitively understand the actual thermal state of TWT during operation, which seriously restricts the research progress of TWT thermal performance analysis. The optimized design brings great inconvenience

Images