Gravity center allocation control method based on liquid level monitoring of single water tank

Abstract

The invention discloses a gravity center allocation control method based on liquid level monitoring of a single water tank, and belongs to the technical field of gravity center allocation control in an aircraft test flight test. The control method comprises the following steps: 1, setting a torque threshold capable of starting adjustment; and 2, calculating a moment amount required to be changed for reaching the target gravity center, judging whether the moment amount is greater than a threshold value of the moment amount capable of starting adjustment or not, and monitoring whether the liquid level of a single water tank reaches an alarm value or not in real time, so as to start a water pump and control the opening degree of an electric ball valve to complete the allocation of the gravity center. The method is designed based on the FPGA, the real-time performance and the accuracy of the control method are improved by utilizing the rapid parallelism of the FPGA, the liquid level of each water tank is monitored, all the water tanks are transferred to participate in gravity center allocation, the liquid level distribution of the water inlet and outlet water tanks is adjusted according to the liquid level monitoring of the single water tank, and the control method combining feedforward and PID is adopted, and meanwhile, a pre-closing strategy is combined to efficiently complete center-of-gravity deployment.

Description

technical field [0001] The invention relates to a center-of-gravity allocation control method based on liquid level monitoring of a single water tank, and belongs to the technical field of center-of-gravity allocation control in aircraft flight tests. Background technique [0002] In the process of aircraft development and flight test, the center of gravity envelope detection is one of the most important indicators, which directly affects the flight safety of the aircraft. The center of gravity adjustment system is an automatic adjustment device based on water medium, which has been widely used by international civil aviation airliner companies. The center of gravity adjustment system can realize rapid and accurate adjustment of the center of gravity during the test flight process related to the center of gravity of the aircraft, realize the functions of maintaining the center of gravity of the aircraft center of gravity in different flight stages, and effectively improve th...

AI Technical Summary

Problems solved by technology

Although the deployment process involves the participation of all water tanks, due to the limited layout area of ​​the system, the system cannot be designed completely symmetrically

In addition, there is an attitude angle during the flight of the aircraft. These factors lead to uneven water inlet and outlet speeds of each water tank when the center of gravity is adjusted.

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