Airborne laser temperature control system power regulation and control method

Abstract

The invention relates to the technical field of lasers, and discloses an airborne laser temperature control system power regulation and control method, which comprises the steps of collecting the temperatures of a plurality of temperature-controlled objects once at set intervals, calculating the difference value between the temperature of the temperature-controlled objects and a target temperature, and calculating standard power according to the difference value. And multiplying the standard power by a weighting factor to calculate a weighted product. Setting a difference threshold, and if the absolute value of the difference is greater than the absolute value of the difference threshold, adding 1 to a weighting factor; and if the absolute value of the difference value is not greater than the absolute value of the difference value threshold value, setting the weighting factor to be 1. Calculating weighted power, and if the standard power is greater than the weighted power, determining that the actual power is equal to the weighted power; and if the standard power is not greater than the weighted power, the actual power is equal to the standard power. According to the invention, by introducing the weighting factor, the dynamic regulation and control of the system power are realized, and more power is distributed to the temperature control unit with larger controlled temperature difference, so that the adjustment time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of lasers, and in particular to a power control method for an airborne laser temperature control system. Background Art

[0002] In the integrated design of airborne lasers, the power distribution of the power supply system faces multiple challenges. First, due to the narrow installation space inside the aircraft, the total power of the laser has a strict upper limit. Secondly, during the rapid climb or dive phase of the aircraft, the external ambient temperature will fluctuate violently in a short period of time (typical changes can reach ±30°C / minute), which poses a severe test to the constant temperature control of precision devices in the laser cavity. When encountering such extreme temperature changes, the instantaneous total power consumption of the temperature control system can easily exceed the safety threshold of the power supply system. If there is a lack of a dynamic power scheduling mechanism at this time, the response rate of each temperature control unit will decrease due to insufficient power supply, and the precision devices will be affected by cold / heat for a longer time, eventually causing the risk of thermal failure of the core device - experimental data show that when the temperature control delay exceeds 120 seconds, the positioning accuracy of the inertial navigation component will deteriorate by 300%, and the calibration failure rate of the optical sensor will increase to 17 times the baseline value after experiencing an uncontrolled temperature change of 5°C / min. Summary of the invention

[0003] Based on the above, the purpose of the present invention is to provide a power regulation method for an airborne laser temperature control system, optimize the distribution of the total power of the temperature control system, and shorten the total time for multiple precision devices in the laser cavity to reach a constant temperature state.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A power control method for an airborne laser temperature control system comprises the following steps: S1. Collect the temperature of n temperature-controlled objects once every t time interval, where n is a positive integer not less than 2; S2. Calculate the difference between the temperature of the temperature-controlled object and the target temperature, denoted as Δ temp1 , Δ temp2 , ..., Δ tempn ; S3, according to Δ tempx Calculate the standard power W1, W2, ..., W n , where x is a positive integer and 1≤x≤n; S4. Calculate the weighted product M x , M x =W x ×T x , where T is a positive integer with an initial value of 1; S5. Set the difference threshold between the temperature of the temperature-controlled object and the target temperature as temp. th ; S6. Comparison Δ tempx The absolute value of temp th The absolute value of Δ tempx >temp th , then T x =T x +1; if Δ tempx ≤temp th , then T x =1; S7. Calculate weighted power P x , , where V is the total power of the temperature control system; S8. Comparison of standard power W x With weighted power P x The size of W x >P x , then the actual power V x =P x ; If W x ≤P x , then the actual power V x =W x .

[0005] As a preferred solution of the power control method of the airborne laser temperature control system, it also includes the following subdivision steps: S3-1, record the difference between the last temperature of the temperature-controlled object and the target temperature, recorded as Δ last1 , Δ last2 , ..., Δ lastn ; S3-2, the difference between the temperature of all temperature-controlled objects and the target temperature recorded after the operation is accumulated, and recorded as S tenp1 , S temp2 ,...,S tempn ; S3-3. Calculate standard power W x , W x =a×Δ tempx +b×S temp +c×(Δ tempx -Δ lastx ), where a, b, and c are system parameters adjusted according to the system.

[0006] The beneficial effects of the present invention are: The present invention collects the temperature of multiple temperature-controlled objects at regular intervals, calculates the difference between the temperature of the temperature-controlled object and the target temperature, and calculates the standard power based on the difference. The standard power is then multiplied by the weighting factor to calculate the weighted product. A difference threshold between the temperature of the temperature-controlled object and the target temperature is set, and the absolute value of the difference is compared with the absolute value of the difference threshold. If the difference is greater than the difference threshold, the weighting factor is +1; if the difference is not greater than the difference threshold, the weighting factor is set to 1. The weighted power is calculated, and the standard power is compared with the weighted power. If the standard power is greater than the weighted power, the actual power is equal to the weighted power; if the standard power is not greater than the weighted power, the actual power is equal to the standard power. The present invention realizes dynamic regulation of system power by introducing weighting factors, and allocates more power to temperature control units with larger controlled temperature differences to shorten the adjustment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0008] Figure 1 It is a flow chart of a power control method of an airborne laser temperature control system provided by a specific embodiment of the present invention; Figure 2 It is a detailed flow chart of a power control method of an airborne laser temperature control system provided by a specific implementation mode of the present invention. DETAILED DESCRIPTION

[0009] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0010] like Figure 1 As shown, this embodiment provides a power control method for an airborne laser temperature control system, the method comprising the following steps: S1. Collect the temperature of n temperature-controlled objects once every t time interval, where n is a positive integer not less than 2. Specifically, in this embodiment, 4 different temperature-controlled objects are taken as examples, that is, n=4. At the same time, for the sake of exemplary explanation, the t time interval in this embodiment is 1ms. During the climb of the aircraft, the temperature in the cabin drops rapidly. For example, the ambient temperature of the laser is -10°C at this time, and the four temperature-controlled objects all need to be kept at a constant temperature of 25°C. However, because the temperature adjustment takes time, and the volume, weight and specific heat capacity of the four temperature-controlled objects themselves are different, the temperature of the four temperature-controlled objects themselves will be higher than the ambient temperature. Assume that the actual temperatures of the four temperature-controlled objects are 0°C, 5°C, 10°C and 15°C respectively.

[0011] S2. Calculate the difference between the temperature of the temperature-controlled object and the target temperature, denoted as Δ temp1 , Δ temp2 , ..., Δ tempn At this time Δ temp1 =-25℃; Δ temp2 =-20℃; Δ temp3 =-15℃; Δ temp4 =-10℃.

[0012] S3, according to Δ tempx Calculate the standard power W1, W2, ..., W n , where x is a positive integer and 1≤x≤n. Calculate the standard power according to the following formula, W X =a×Δ tempx , where a is a system parameter.

[0013] S4. Calculate the weighted product M x , M x =W x ×T x , where T is a positive integer with an initial value of 1. Initially, M1=W1×1, M2=W2×1, M3=W3×1, and M4=W4×1.

[0014] S5. Set the difference threshold between the temperature of the temperature-controlled object and the target temperature as temp. th Specifically, in this embodiment, temp th is 0.1℃.

[0015] S6. Comparison Δ tempx The absolute value of temp th The absolute value of Δ tempx >temp th , then T x =T x +1; if Δ tempx ≤temp th , then Tx =1. The system makes a judgment every 1ms. Assume that after 1s, the absolute value of the difference between the temperature of the controlled object and the target temperature is less than the difference threshold temp for the first time. th Before this, the weighting factors are accumulated, that is, At 1ms, T1=1, T2=1, T3=1, T4=1; At 2ms, T1=2, T2=2, T3=2, T4=2; ...... At 999ms, T1=999, T2=999, T3=999, T4=999; 1s, the absolute value of the difference between the temperature of the controlled object and the target temperature is less than the difference Value threshold temp th Specifically, the absolute value of the difference between the temperature of the third controlled object and the target temperature is less than the difference threshold temp th , then T1=1000, T2=1000, T3=1, T4=1000; S7. Calculate weighted power P x , , where V is the total power of the temperature control system; in this embodiment, the total system power V=1000W, and the four controlled objects are in Δ temp1 =-25℃; Δ temp2 =-20℃; Δ temp3 =-15℃; Δ temp4 = -10 ℃ condition, the required temperature control power is 500W, 400W, 300W and 200W respectively. Under this condition, the total standard power required for temperature control exceeds the total system power.

[0016] S8. Comparison of standard power W x With weighted power P x The size of W x >P x , then the actual power V x =P x ; If W x ≤P x , then the actual power V x =W x Under the above conditions, P1=357.1W, P2=285.7W, P3=214.2W, P4=142.8W. That is, 999ms ago, W x >P x , the actual power V of the thermostat of each controlled object x =P xHowever, at 1s, the absolute value of the difference between the temperature of the third controlled object and the target temperature is less than the difference threshold temp th , so that T3 = 1. On this basis, the weights of the weighted power change, P1 = 454.4W, P2 = 363.5W, P3 = 0.27W, P4 = 181.7W.

[0017] Furthermore, the temperature difference between the actual temperature and the target temperature of the first, second and fourth controlled objects decreases, and the temperature difference between the actual temperature and the target temperature of the third controlled object increases, causing the weighting factor to accumulate again. However, during the change process, the system power is always applied to other controlled objects to quickly reduce the temperature difference until the absolute value of the difference between the temperature of a controlled object and the target temperature is less than the difference threshold temp again. th After that, the weight changes again, and the thermostats that have not reached the difference threshold will be given a higher weight to further quickly narrow the temperature difference, shorten the time that precision components are affected by cold / heat, and reduce the risk of thermal failure of core components.

[0018] like Figure 2 As shown, the airborne temperature control unit power control method provided in this embodiment is basically the same as that in the first embodiment, and only some steps are different. This embodiment only describes the steps that are different from the first embodiment.

[0019] It also includes the following subdivision steps: S3-1, record the difference between the last temperature of the temperature-controlled object and the target temperature, recorded as Δ last1 , Δ last2 , ..., Δ lastn ; S3-2, the difference between the temperature of all temperature-controlled objects and the target temperature recorded after the operation is accumulated, and recorded as S tenp1 , S temp2 ,...,S tempn ; S3-3. Calculate standard power W x , W x =a×Δ tempx +b×S temp +c×(Δ tempx -Δ lastx ), where a, b, and c are system parameters adjusted according to the system.

[0020] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A power control method for an airborne laser temperature control system, characterized in that: The following steps are involved: S1. Collect the temperature of n temperature-controlled objects once every t time interval, where n is a positive integer not less than 2; S2. Calculate the difference between the temperature of the temperature-controlled object and the target temperature, denoted as Δ temp1 , Δ temp2 , ..., Δ tempn ; S3, according to Δ tempx Calculate the standard power W1, W2, ..., W n , where x is a positive integer and 1≤x≤n; S4. Calculate the weighted product M x , M x =W x ×T x , where T is a positive integer with an initial value of 1; S5. Set the difference threshold between the temperature of the temperature-controlled object and the target temperature as temp. th ; S6. Comparison Δ tempx The absolute value of temp th The absolute value of Δ tempx >temp th , then T x =T x +1; if Δ tempx ≤temp th , then T x =1; S7. Calculate weighted power P x , , where V is the total power of the temperature control system; S8. Comparison of standard power W x With weighted power P x The size of W x >P x , then the actual power V x =P x ; If W x ≤P x , then the actual power V x =W x .

2. The power control method of the airborne temperature control system according to claim 1, characterized in that: It also includes the following subdivision steps S3-1, record the difference between the last temperature of the temperature-controlled object and the target temperature, recorded as Δ last1 , Δ last2 , ..., Δ lastn ; S3-2, the difference between the temperature of all temperature-controlled objects and the target temperature recorded after the operation is accumulated, and recorded as S tenp1 , S temp2 ,...,S tempn ; S3-3. Calculate standard power W x , W x =a×Δ tempx +b×S temp +c×(Δ tempx -Δ lastx ), where a, b, and c are system parameters adjusted according to the system.

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