CN111003215A - Frequency matching control method and system for working medium-free thrust controller - Google Patents
Frequency matching control method and system for working medium-free thrust controller Download PDFInfo
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Abstract
The invention provides a working medium-free thrust controller frequency matching control method and system, and the phase-frequency closed-loop and power-frequency double closed-loop control method is applied to the field of working medium-free propulsion. The frequency matching control method of the working medium-free thrust controller comprises the following steps: step 1, starting power-frequency closed-loop control to search a central frequency point of a thruster; step 2, the phase measurement module measures the S12 parameter phase difference between the incident power and the reflected power of the thruster at the central frequency point of the thruster
Step 3, using the phase difference
And operating the phase-frequency closed loop control for the control target of the phase-frequency closed loop. The invention solves the problem that the design of the system is only suitable for the condition that the quality factor of the cavity of the thruster is lower (about 10000 levels).
Description
Technical Field
The invention relates to a realization of a frequency matching control algorithm of a working medium-free thrust controller based on phase-frequency closed loop and power-frequency closed loop double closed loop control, and belongs to the field of aerospace propulsion design.
Background
The push without working medium (or electromagnetic push without loss of quality) is a new concept push technology which appears in recent years. The technology utilizes the uneven distribution of microwaves in a resonant cavity with a specific structure to generate thrust, has the advantages of no need of carrying fuel, long service life, convenience in use and the like, can greatly improve the performance of the spacecraft, and can generate a new concept spacecraft based on the technology.
The frequency matching control and the realization of the working medium-free thrust controller are key technologies of working medium-free propulsion. After microwave power enters the thruster resonant cavity, the frequency of the microwave system is not matched with that of the thruster resonant cavity due to the central frequency drift of the thermal effect thruster resonant cavity, so that the problem of frequency matching of the microwave system needs to be solved. At present, the frequency matching design of the mass-loss-free electromagnetic propulsion technology generally adopts a scheme of a power-frequency closed-loop control algorithm, is only suitable for the condition that the quality factor of a cavity of a thruster is low (about 10000 levels), and is difficult to meet the closed-loop control requirement of a high-Q cavity (higher than 1000000 levels).
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a working medium-free thrust controller frequency matching control method based on double closed-loop control of a phase-frequency closed loop and a power-frequency closed loop and a mass loss-free electromagnetic propulsion system, applies a phase-frequency closed loop and power-frequency closed loop double closed-loop control algorithm to the field of working medium-free propulsion design, and solves the problem that the design of the system is only suitable for the condition that the cavity quality factor of a thruster is low (about 10000 levels).
The technical scheme adopted by the invention is as follows: a quality-loss-free electromagnetic propulsion system based on phase-frequency closed loop and power-frequency closed loop double closed loop control comprises a controller, a power measurement module, a phase measurement module, a signal source, an amplifier, a circulator and a thruster;
phase difference between incident power and reflected power of thruster measured by phase measurement module
Converting the phase difference into an electric signal and sending the electric signal to a controller;
the power measurement module measures the reflected power of the thruster of the circulator, converts the measured reflected power of the thruster into an electric signal and sends the electric signal to the controller;
the controller receives a phase measurement signal of the phase measurement module and a power measurement signal of the power measurement module, and outputs a frequency control signal to the signal source according to the received measurement signals and a set control logic;
the signal source outputs signals with corresponding frequency and power to the amplifier according to the output frequency and power setting of the controller;
the amplifier amplifies the power of the signal source into microwave power output.
The frequency matching control method of the working medium-free thrust controller comprises the following steps:
In step 1, the power-frequency closed-loop control method comprises the following specific steps:
step 1.1, setting a frequency sweep range W of a controller; giving a controller frequency Step length Step, and controlling a signal source to output a signal by the controller according to the given control signal;
step 1.2, in a frequency range W, stepping and sweeping the frequency of a signal source by Step; in the frequency sweeping process, a power measurement module measures the reflection power Pr of the thruster, the reflection power Pr is sent to a controller through a signal, the controller records the corresponding frequency f1 when the Pr is minimum, and the frequency f1 is the current center frequency and the controller starting frequency;
step 1.3, if the controller finds the center frequency f1, the controller controls the signal source to output left and right frequency sweeps in a frequency range of [ f1-3 × Step, f1+3 × Step ], the frequency output time of each frequency point is 20ms, the corresponding frequency f2 is recorded in each frequency sweep period when the Pr is minimum, and when one frequency sweep period is finished, the controller assigns the value of f2 to f1 to enter the next frequency sweep period.
In Step 1.1, the Step length Step is less than or equal to 0.1 × 3dB of bandwidth.
In step 3, the phase-frequency closed-loop control method comprises the following specific steps:
step 3.1, giving phase given central frequency point S12 parameter phase difference
Giving a frequency Step length Step, giving the current output frequency f0 of the controller, and controlling the signal source to output a signal by the controller;
step 3.2, the phase measurement module measures the phase difference between the incident power and the reflected power of the thruster
The phase measurement module detects the phase difference signal
Sending to a controller;
step 3.3, controller comparison
When in use
When the value is less than the control threshold value, the judgment is made if
The controller outputs a control instruction to the signal source to enable the frequency to Step by Step in the forward direction;
such as
The controller outputs a control instruction to the signal source to enable the frequency to be stepped in a negative direction;
step 3.4, after the output frequency of the signal source is stepped, the phase measurement module measures the phase difference between the incident power and the reflected power
Detecting the phase difference signal
Sending controller, controller comparison
When the phase difference is between
If the phase difference is smaller than the control threshold value, the control method is considered to achieve the control target, if the control threshold value is not met, the step 3.2 is returned, and the phase difference between the incident power and the reflected power is continuously measured
In Step 3.1, the Step length Step is less than or equal to 0.1 × 3dB of bandwidth.
Compared with the prior art, the invention has the advantages that:
by introducing the phase-frequency closed loop and the power-frequency double closed loop control, the invention enables the non-quality-loss electromagnetic propulsion to realize frequency matching and stable work, can meet the frequency stable matching of a high Q thruster (the quality factor is higher than 1000000 grade) and a low Q thruster (the quality factor is 10000 grade), can effectively improve the working performance of the non-quality-loss electromagnetic propulsion, prolongs the service life of a spacecraft, and can generate a new concept spacecraft on the basis.
Drawings
FIG. 1 is a flow chart of a phase-frequency closed loop control method;
FIG. 2 is a flow chart of a power-frequency closed loop control method;
FIG. 3 is a flow chart of a power-frequency closed loop and phase-frequency closed loop dual closed loop control method;
FIG. 4 is a diagram of a non-working medium propulsion system configuration using power-frequency closed loop and phase-frequency closed loop dual closed loop control algorithms;
Detailed Description
The invention is described below with reference to the accompanying drawings and examples.
As shown in fig. 4, a mass-loss-free electromagnetic propulsion system based on phase-frequency closed loop and power-frequency closed loop dual closed loop control comprises a controller, a power measurement module, a phase measurement module, a signal source, an amplifier, a circulator and a thruster;
phase difference between incident power and reflected power of thruster measured by phase measurement module
Converting the phase difference into an electric signal and sending the electric signal to a controller;
the power measurement module measures the thruster reflected power of the 3 port of the circulator and converts the measured thruster reflected power into an electric signal to be sent to the controller;
the controller receives a phase measurement signal of the phase measurement module and a power measurement signal of the power measurement module, and outputs a frequency control signal to the signal source according to the received measurement signals and a set control logic;
the signal source outputs signals with corresponding frequency and power to the amplifier according to the output frequency and power setting of the controller;
the amplifier amplifies the power of the signal source into microwave power output;
as shown in fig. 3, the data relationship among the phase measurement module, the power measurement module, the controller, and the signal source is shown in the phase-frequency closed-loop algorithm program and the power-frequency closed-loop control method program.
A frequency matching control method for a working medium-free thrust controller comprises the following steps:
the power-frequency closed-loop algorithm is as shown in fig. 2, the algorithm searches for the minimum value of the reflected power through frequency sweep, and the frequency of the reflected power is considered as the center frequency of the cavity of the thruster. The algorithm judges the frequency matching of the thruster by detecting the reflected power of the thruster and gives a control and adjustment signal.
The power-frequency closed-loop control method comprises the following specific steps:
step 1.1, setting a frequency sweep range W of a controller; giving a controller frequency Step length Step (less than or equal to 0.1X 3dB bandwidth), and outputting a signal by the controller according to the given control signal source;
step 1.2, in a frequency range W, stepping and sweeping the frequency of a signal source by Step; in the frequency sweeping process, a power measurement module measures the reflection power Pr of the thruster, the reflection power Pr is sent to a controller through a signal, the controller records the corresponding frequency f1 when the Pr is minimum, and the frequency f1 is the current center frequency and the controller starting frequency;
step 1.3, if the controller finds the center frequency f1, the controller controls a signal source to perform frequency sweep output left and right in a Step stepping frequency sweep within a frequency range of [ f1-3 × Step, f1+3 × Step ], the output time of each frequency point is 20ms, the corresponding frequency f2 is recorded in each frequency sweep period when the Pr is minimum, and when one frequency sweep period is finished, the controller assigns the value of f2 to f1 to enter the next frequency sweep period;
the phase-frequency closed-loop algorithm is shown in figure 1, and the algorithm judges the frequency matching of the thruster and gives a control and adjustment signal by comparing the transmission phase characteristics of the input port and the signal detection port of the thruster.
The phase-frequency closed-loop control method comprises the following specific steps:
step 3.1, giving phase given central frequency point S12 parameter phase difference
Giving a frequency Step length Step (Step is less than or equal to 0.1 × 3dB bandwidth), giving the current output frequency f0 of the controller, and controlling the signal source to output a signal by the controller;
step 3.2, the phase measurement module measures the phase difference between the incident power and the reflected power of the thruster
The phase measurement module detects the phase difference signal
Sending to a controller;
step 3.3, controller comparison
When in use
When the value is less than the control threshold value, the judgment is made if
The controller outputs a control instruction to the signal source to enable the frequency to Step by Step in the forward direction (the output frequency of the signal source is increased);
such as
The controller outputs a control instruction to the signal source to enable the frequency to be stepped in a negative direction (the output frequency of the signal source is reduced);
step 3.4, after the output frequency of the signal source is stepped, the phase measurement module measures the phase difference between the incident power and the reflected power
Detecting the phase difference signal
Sending controller, controller comparison
When the phase difference is between
If the phase difference is smaller than the control threshold value, the control method is considered to achieve the control target, if the control threshold value is not met, the step 3.2 is returned, and the phase difference between the incident power and the reflected power is continuously measured
Power-frequency closed loop control may be used alone.
Example (b):
fig. 1 is a phase-frequency closed loop algorithm for controlling frequency matching stability by detecting a phase transmission signal of a thruster. Table 1 shows an example of a phase-frequency closed loop algorithm. Given phase given central frequency point S12 parameter phase difference
Giving controller frequency Step length Step equal to 0.25MHz to phase difference
For observation, the phase measurement module measures the phase difference between the incident power and the reflected power of the thruster
When the signal source frequency omega 1 is not matched with the cavity central frequency omega 0, the phase difference is generated
And when the deviation exceeds the threshold range, the controller sends out an instruction to control the frequency omega 1 of the signal source to catch up with the central frequency omega 0 of the cavity, so that the frequency matching is realized.
TABLE 1 phase-frequency closed-loop Algorithm
Fig. 2 is a power-frequency closed loop algorithm for controlling frequency matching stability by detecting a reflected power signal of a thruster. The controller cooperates with the signal source and the power measurement module, the controller controls the signal source to output frequency f0 by taking step as step sweep frequency within a frequency range W, the power measurement module measures the thruster reflected power Pr of the 3 port of the circulator, the controller records the corresponding frequency f1 when the Pr is minimum within the frequency range W, and the frequency f1 is the current center frequency and the controller starting frequency. If the controller finds the central frequency f1, the controller controls the signal source to output left and right frequency sweeps in a frequency range of [ f1-3 Step, f1+3 Step ], the frequency sweep is stepped by Step, each frequency point outputs 20ms, the corresponding frequency f2 is recorded in each frequency sweep period when the Pr is minimum, and when one frequency sweep period is finished, the controller gives the value of f2 to f1 to enter the next frequency sweep period.
TABLE 2 Power-frequency closed-loop algorithm embodiment
FIG. 3 shows a power-frequency closed loop and a phase-frequency closed loop dual closed loop control algorithm, the phase-frequency closed loop control algorithm and the power-frequency closed loop control algorithm being used in combinationBefore the phase-frequency closed loop is used, the power-frequency closed loop is firstly used to find out the central frequency point of the cavity of the thruster, and then the phase measurement module measures the phase difference between the incident power and the reflected power of the thruster at the frequency
By phase difference
Is a control target of a phase-frequency closed loop.
The present invention has not been described in detail, partly because of the knowledge of the person skilled in the art.
Claims (6)
1. A quality-loss-free electromagnetic propulsion system based on phase-frequency closed loop and power-frequency closed loop double closed loop control is characterized by comprising a controller, a power measurement module, a phase measurement module, a signal source, an amplifier, a circulator and a thruster;
phase difference between incident power and reflected power of thruster measured by phase measurement module
Converting the phase difference into an electric signal and sending the electric signal to a controller;
the power measurement module measures the reflected power of the thruster of the circulator, converts the measured reflected power of the thruster into an electric signal and sends the electric signal to the controller;
the controller receives a phase measurement signal of the phase measurement module and a power measurement signal of the power measurement module, and outputs a frequency control signal to the signal source according to the received measurement signals and a set control logic;
the signal source outputs signals with corresponding frequency and power to the amplifier according to the output frequency and power setting of the controller;
the amplifier amplifies the power of the signal source into microwave power output.
2. The method for controlling the frequency matching of the no-working-medium thrust controller of the no-mass-loss electromagnetic propulsion system according to claim 1, comprising the steps of:
step 1, starting power-frequency closed-loop control to search a central frequency point of a thruster;
step 2, the phase measurement module measures the S12 parameter phase difference between the incident power and the reflected power of the thruster at the central frequency point of the thruster
Step 3, using the phase difference
And operating the phase-frequency closed loop control for the control target of the phase-frequency closed loop.
3. The working medium-free thrust controller frequency matching control method according to claim 2, wherein in the step 1, the power-frequency closed-loop control method comprises the following specific steps:
step 1.1, setting a frequency sweep range W of a controller; giving a controller frequency Step length Step, and controlling a signal source to output a signal by the controller according to the given control signal;
step 1.2, in a frequency range W, stepping and sweeping the frequency of a signal source by Step; in the frequency sweeping process, a power measurement module measures the reflection power Pr of the thruster, the reflection power Pr is sent to a controller through a signal, the controller records the corresponding frequency f1 when the Pr is minimum, and the frequency f1 is the current center frequency and the controller starting frequency;
step 1.3, if the controller finds the center frequency f1, the controller controls the signal source to output left and right frequency sweeps in a frequency range of [ f1-3 × Step, f1+3 × Step ], the frequency output time of each frequency point is 20ms, the corresponding frequency f2 is recorded in each frequency sweep period when the Pr is minimum, and when one frequency sweep period is finished, the controller assigns the value of f2 to f1 to enter the next frequency sweep period.
4. The frequency matching control method for the working medium-free thrust controller according to claim 2 or 3, wherein in Step 1.1, the Step length Step is less than or equal to 0.1 x 3dB bandwidth.
5. The frequency matching control method for the working medium-free thrust controller according to claim 4, wherein in the step 3, the phase-frequency closed-loop control method comprises the following specific steps:
step 3.1, giving phase given central frequency point S12 parameter phase difference
Giving a frequency Step length Step, giving the current output frequency f0 of the controller, and controlling the signal source to output a signal by the controller;
step 3.2, the phase measurement module measures the phase difference between the incident power and the reflected power of the thruster
The phase measurement module detects the phase difference signal
Sending to a controller;
step 3.3, controller comparison
When in use
When the value is less than the control threshold value, the judgment is made if
The controller outputs a control instruction to the signal source to enable the frequency to Step by Step in the forward direction;
such as
The controller outputs a control instruction to the signal source to enable the frequency to be stepped in a negative direction;
step 3.4, after the output frequency of the signal source is stepped, the phase measurement is carried outModule for measuring phase difference between incident power and reflected power
Detecting the phase difference signal
Sending controller, controller comparison
When the phase difference is between
If the phase difference is smaller than the control threshold value, the control method is considered to achieve the control target, if the control threshold value is not met, the step 3.2 is returned, and the phase difference between the incident power and the reflected power is continuously measured
6. The method for controlling frequency matching of a no-working-medium thrust controller according to claim 5, wherein in Step 3.1, the Step length Step is less than or equal to 0.1 x 3dB bandwidth.
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| CN114233593A (en) * | 2021-12-03 | 2022-03-25 | 中国空间技术研究院 | Improved-design electromagnetic propulsion system without mass loss |
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