Traveling-wave tube internal temperature soft-measurement method based on finite element model

Abstract

The invention discloses a traveling-wave tube internal temperature soft-measurement method based on a finite element model. With multi-point temperature values of the shell of a traveling-wave tube as auxiliary variables, the finite element soft-measurement thermal model of the traveling-wave tube is created; with heat source distribution as independent variables, a target function of an error sum of squares between the multi-point temperature measurement values of the shell and corresponding point temperature simulation values of the finite element thermal model of the traveling-wave tube is derived, and is solved by an iterative algorithm, so that an optimal heat source distribution solution is obtained, finally, the optimal heat source distribution solution is loaded into the finite element thermal model of the traveling-wave tube, and an internal temperature soft-measurement value of the traveling-wave tube is obtained by finite element stimulation calculation. The traveling-wave tube internal temperature soft-measurement method based on the finite element model breaks through the limitation of conventional detection, and prevents a series of complex problems brought about by temperature sensors placed in traveling-wave tubes, measurement is convenient, the implementation cost is low, and the traveling-wave tube internal temperature soft-measurement method based on the finite element model can be applied in the mass testing 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...

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

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