A kind of two-body model verification machine and airborne cable network segment impedance self-matching method

Abstract

The application discloses a kind of twin model verification machine and airborne cable network segmentation impedance self-matching method, it is related to aviation technology field, solve the technical problem that existing twin model verification machine uses airborne cable network signal transmission quality is poor, twin model verification machine is set multiple separation surfaces and divides airborne cable network into multiple cable, each separation surface is provided with impedance self-matching unit;Impedance self-matching unit includes voltage sensor, current sensor, signal acquisition circuit, signal processing module, core control unit and digital potentiometer;Among them, core control unit receives digital signal and carries out calculation, and issues control signal to digital potentiometer, digital potentiometer reads control signal and adjusts each load loop output impedance value by adjusting, impedance matching is carried out to cable;The application improves the self-matching ability and self-matching response rate of cable network by the way of segmentation adjustment, realizes fast high-quality communication, driving and power signal transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation technology, and more particularly to a twin-body model verification machine and an airborne cable network segmented impedance self-matching method. BACKGROUND

[0002] The segmented airborne cable network of the twin-body model verification machine is a core system for realizing transmission of control signals, driving signals and power supply signals of the whole large twin-body model verification machine. The large twin-body model verification machine has a complex structure, a large number of airborne electrical equipment, high requirements for control signals, driving signals and power supply signals, and complex cable routing arrangement. The cable network needs to be repeatedly disassembled and transported for transportation and debugging, and therefore needs to be provided with a cable separation surface to ensure the detachability of the cable. After the airborne equipment is connected to the airborne cable network, the matching resistance needs to be segmented and adjusted according to the actual situation of the final signal transmission quality and impedance matching, and an absorption circuit needs to be added for a specific load to ensure the normal work of special components such as rudders and landing gears. Continuously adjusting the matching impedance according to the actual situation of the temperature environment is one of the important ways to improve the signal quality and the signal transmission quality.

[0003] At present, the airborne cable network of the large twin-body model verification machine has a long length and a large number of loops, and the DC power supply signals, PWM driving signals and AC signals are mutually coupled to affect the signal transmission quality. The impedance matching is mainly realized by a unified fixed resistance value. The large twin-body model verification machine has a high flight altitude, and the ground and air environmental conditions are quite different. The high-altitude temperature, vibration and electromagnetic radiation have a great influence on the communication, driving and power supply of the cable network. The fixed resistance value of the impedance matching realizes dynamic adjustment of the matching impedance with the change of the environmental conditions. The signal coupling is serious, and the communication and control signals are easily distorted, and the power supply signal quality is reduced. SUMMARY

[0004] The present application aims at solving the above technical problems, and provides a twin-body model verification machine and an airborne cable network segmented impedance self-matching method.

[0005] In order to achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions:

[0006] A twin-body model verification machine, the twin-body model verification machine is provided with a plurality of separation surfaces to divide the airborne cable network into a plurality of cable segments, and an impedance self-matching unit is arranged at each separation surface;

[0007] The impedance self-matching unit comprises a voltage sensor, a current sensor, a signal acquisition circuit, a signal processing module, a core control unit and a digital potentiometer.

[0008] The voltage sensor and the current sensor collect voltage and current information and transmit the voltage and current information to the signal acquisition circuit, the signal acquisition circuit transmits the received voltage and current information to the signal processing module, the signal processing module receives the voltage and current information and converts the voltage and current information into digital signals and then transmits the digital signals to the core control unit, and the core control unit receives the digital signals, performs calculation, and issues a control signal to the digital potentiometer.

[0009] Further, the core control unit is connected with the flight control computer through the communication module.

[0010] Further, the airborne cable network is divided into a left fuselage cable, a right fuselage cable, a left wing cable, a right wing cable, a left vertical tail cable, a horizontal tail cable and a wake rake cable.

[0011] Further, the two ends of the digital potentiometer are provided with a TVS clamping diode and an absorption capacitor.

[0012] Further, two adjacent impedance self-matching units are connected through a multi-core electric connector with a locking mechanism and a multi-core cable.

[0013] Further, a shielding layer is arranged in the wrapping layer of the multi-core cable.

[0014] In addition, the application also provides a method for segmenting and impedance self-matching of the airborne cable network of the above-mentioned twin model verification machine, and the method for impedance self-matching of each impedance self-matching unit comprises the following steps:

[0015] Step S1: obtaining the change rates of voltage and current in the ground state;

[0016] Step S2: obtaining the change rates of voltage and current of a plurality of sampling points in the air state, and then calculating the average values of the change rates of voltage and current;

[0017] Step S3: performing difference calculation on the average values of the change rates of voltage and current obtained in step S2 and the change rates of voltage and current in the ground state obtained in step S1, to obtain a deviation rate;

[0018] Step S4: if the deviation rate obtained in step S3 is greater than 10%, impedance self-matching is started, and the matching resistance is dynamically adjusted until the deviation rate is less than 10%.

[0019] Further, before step S1, an initial matching resistance value is obtained, and if the difference value obtained in step S3 is greater than 10% of the change rate of voltage and current in the ground state, the matching resistance is dynamically adjusted on the basis of the initial matching resistance value.

[0020] Further, the calculation formula of the initial matching resistance value is:

[0021]

[0022] wherein R c is the initial matching resistance value; L is the inductance; and C is the capacitance.

[0023] Further, the calculation formula of the voltage and the current rate of change is as follows:

[0024]

[0025]

[0026] wherein U is the voltage at both ends of the cable section; L is the inductance; is the rate of change of the current; I is the current flowing through the cable; and C is the capacitance; is the rate of change of the voltage.

[0027] The beneficial effects of the present application are as follows:

[0028] 1. The present application divides the airborne cable network into multiple cable sections through multiple separation surfaces, ensuring that the airborne cable network can be repeatedly disassembled and transported at random; by setting impedance self-matching units at each separation surface, voltage acquisition and current acquisition are realized, the impedance characteristics, damping state and oscillation of the cable loop in the section are judged by analyzing the voltage and current off-time, timing and rate of change, and self-matching adjustment is performed, the self-matching ability and response rate of the cable network are improved through segmented adjustment, realizing fast and high-quality communication, driving and power signal transmission.

[0029] 2. The present application can improve the linearity of the driving signal waveform, absorb voltage oscillation and optimize the driving waveform by setting TVS clamping diodes and absorption capacitors.

[0030] 3. The present application can meet the requirements of high-altitude temperature environment, vibration environment and electromagnetic radiation environment, and can be firmly installed and easily disassembled by using a multi-core electrical connector with a locking mechanism and a multi-core cable for connection.

[0031] 4. The present application can effectively absorb and release the current generated by the shielding layer due to electromagnetic interference by using a multi-core cable with a shielding layer for cable network construction, and connecting the shielding layer to the large catamaran model verification machine body.

[0032] 5. The application can judge the partial fault in the cable loop by monitoring the voltage and current in the cable loop, when the current voltage appears abnormal situation and the power distribution system does not respond, the fault information is uploaded to the flight control computer through the communication module, and the flight control computer controls the core control unit to actively perform the current limiting operation.

[0033] 6. The application introduces the second-order circuit model and the hysteresis feedback model into the impedance self-matching control process, and realizes the segmented impedance self-matching method by adjusting the respective digital potentiometers, thereby improving the signal transmission accuracy of the airborne cable network of the large twin model verification machine, and improving the transmission quality of the communication, driving and power signals. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 is the layout schematic diagram of the segmented impedance self-matching airborne cable network of the application;

[0035] Fig. 2 is the system flow block diagram of the impedance self-matching unit in the application;

[0036] Fig. 3 is the control flowchart of the segmented impedance self-matching airborne cable network of the application.

[0037] The figure legend: 1-separation surface one; 2-separation surface two; 3-separation surface three; 4-separation surface four; 5-separation surface five; 6-separation surface six; 7-separation surface seven; 8-separation surface eight; 9-separation surface nine; 10-separation surface ten; 11-left fuselage cable; 12-right fuselage cable; 13-left wing cable; 14-right wing cable; 15-left vertical tail cable; 16-horizontal tail cable; 17-trail rake cable. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be described clearly and completely below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0040] Embodiment 1

[0041] As Fig. 1 andFig. 3 As shown, the embodiment provides a twin-body model verification machine, the twin-body model verification machine is provided with multiple separation surfaces to divide the airborne cable network into multiple cable segments, and an impedance self-matching unit is arranged at each separation surface;

[0042] The impedance self-matching unit comprises a voltage sensor, a current sensor, a signal acquisition circuit, a signal processing module, a core control unit and a digital potentiometer.

[0043] The voltage sensor and the current sensor collect voltage and current information and transmit the voltage and current information to the signal acquisition circuit, the signal acquisition circuit transmits the received voltage and current information to the signal processing module, the signal processing module receives the voltage and current information and converts the voltage and current information into digital signals and then transmits the digital signals to the core control unit, the core control unit receives the digital signals and performs calculation and sends a control signal to the digital potentiometer, and the digital potentiometer reads the control signal and adjusts the output impedance value of each load loop to match the impedance of the cable.

[0044] Specifically, the voltage sensor and the current sensor collect the voltage and current at the sampling point of the separation surface of the airborne cable and the connected load in the segment in real time.

[0045] Further, the airborne cable network is divided into left fuselage cable 11, right fuselage cable 12, left wing cable 13, right wing cable 14, left vertical tail cable 15, horizontal tail cable 16 and wake rake cable 17.

[0046] Specifically, as shown in the figure, Fig. 1 The number of separation surfaces is ten, which are separation surface one 1, separation surface two 2, separation surface three 3, separation surface four 4, separation surface five 5, separation surface six 6, separation surface seven 7, separation surface eight 8, separation surface nine 9 and separation surface ten 10. The full-aircraft cable network of the verification machine is divided into left fuselage cable 11, right fuselage cable 12, left wing cable 13, right wing cable 14, left vertical tail cable 15, horizontal tail cable 16 and wake rake cable 17 through the above-mentioned ten separation surfaces, and the equipment cable is installed in a pre-buried manner. An impedance self-matching unit is arranged on each separation surface for segmented impedance self-matching.

[0047] The present application divides the airborne cable network into multiple cable segments through multiple separation surfaces, ensures that the airborne cable network can be repeatedly disassembled and transported with the twin-body, sets an impedance self-matching unit at each separation surface, realizes voltage acquisition and current acquisition, analyzes the voltage and current off-time, timing and change rate, judges the impedance characteristics, damping state and oscillation of the cable loop in the segment, and performs self-matching adjustment, improves the self-matching ability and self-matching response rate of the cable network through segmented adjustment, realizes fast and high-quality communication, driving and power supply signal transmission.

[0048] Example 2

[0049] This embodiment is further optimized on the basis of embodiment 1.

[0050] Further, the core control unit is connected with the flight control computer through the communication module.

[0051] The application can judge the partial fault in the cable loop by monitoring the voltage and current in the cable loop, and when the current and voltage are abnormal and the power distribution system does not respond, the fault information is uploaded to the flight control computer through the communication module, and the flight control computer controls the core control unit to actively perform current limiting operation.

[0052] The impedance matching is further optimized for the waveform quality, and further, the two ends of the digital potentiometer are provided with a TVS clamping diode and an absorption capacitor.

[0053] It should be noted that for airborne equipment with strict requirements on turn-off time, an active clamping circuit is used to adjust the clamping voltage to meet the turn-off time and current / voltage change rate requirements.

[0054] The application can improve the linearity of the driving signal waveform, absorb voltage oscillation, and optimize the driving waveform by setting the TVS clamping diode and the absorption capacitor.

[0055] Further, the two adjacent impedance self-matching units are connected through a multi-core electrical connector with a locking mechanism and a multi-core cable.

[0056] The application can meet the requirements of high-altitude temperature environment, vibration environment and electromagnetic radiation environment, and is firm and convenient to disassemble and assemble by using the multi-core electrical connector with a locking mechanism and the multi-core cable.

[0057] Further, the shielding layer is arranged in the wrapping layer of the multi-core cable.

[0058] The application can effectively absorb and release the current generated by the shielding layer due to electromagnetic interference by using the multi-core cable with a shielding layer for cable network construction, and connecting the shielding layer to the body of the large-scale catamaran verification machine.

[0059] Embodiment 3

[0060] This embodiment is based on the above embodiments, as shown in Figs. 1 to 3 The application further provides a method for segmenting impedance self-matching of the airborne cable network of the catamaran verification machine, and the method for impedance self-matching of each impedance self-matching unit comprises the following steps:

[0061] Step S1: obtaining the change rate of voltage and current under ground state;

[0062] Step S2: Obtain the voltage and current rate of change of a plurality of sampling points in the air state, and then calculate the average value of the voltage and current rate of change;

[0063] Step S3: Calculate the difference between the average value of the voltage and current rate of change obtained in step S2 and the voltage and current rate of change on the ground in step S1 to obtain the deviation rate;

[0064] Step S4: If the deviation rate obtained in step S3 is greater than 10%, start to perform impedance self-matching, dynamically adjust the matching resistance until the deviation rate is less than 10%.

[0065] It should be noted that the above-mentioned deviation rate refers to the ratio of the difference between the average value of the voltage and current rate of change and the voltage and current rate of change on the ground to the voltage and current rate of change on the ground.

[0066] Specifically, the impedance self-matching algorithm of the present application is constructed based on a second-order circuit model and a hysteresis feedback model. After the cable network is laid, the inductance L and the capacitance C of the cable loop are measured according to the actual driving circuit and the working frequency of the communication signal, and the initial matching resistance value Rc is obtained according to the critical damping calculation formula of the second-order circuit.

[0067]

[0068] Wherein, R c is the initial matching resistance value; L is the inductance; C is the capacitance.

[0069] The core control unit assigns Rc1, Rc2, … to the corresponding digital potentiometers as the initial value of the matching resistance.

[0070] During ground debugging, the voltage and current rate of change is calculated according to the capacitive load and inductive load calculation formula of the second-order circuit, and this rate of change is considered as the optimal driving waveform rate of change of the cable loop on the ground.

[0071] The calculation formula of the voltage and current rate of change is:

[0072]

[0073]

[0074] Wherein, U is the voltage at both ends of the cable segment; L is the inductance; is the rate of change of the current; I is the current flowing through the cable; C is the capacitance; is the rate of change of the voltage.

[0075] The voltage and current of the segment are sampled by the voltage sensor and the current sensor, and the voltage and current change rates are calculated and digitally filtered in real time, ten sampling points are taken to calculate the voltage and current change rates, and the average value is taken, which can avoid the data deviation caused by calculation error, and the average value is compared with the voltage change rate and the current change rate on the ground, when the average value is lower than the ground change rate or the deviation of the average value is higher than the ground change rate by more than 10%, impedance self-matching is started. The initial matching resistance value is taken as the basis, the digital potentiometer digital quantity adjustment input is calculated according to the difference of the change rate, the digital potentiometer adjusts the matching resistance value according to the digital quantity adjustment input, and the resistance is continuously adjusted according to the feedback adjustment, until the deviation rate is controlled within 10%, so that the cable loop is in a critical damping and slightly over-damped state; the number of oscillations is indirectly judged by judging the number of change rates of 0, which is used as a backup criterion for damping state.

[0076] The application introduces a second-order circuit model and a hysteresis feedback model into the impedance self-matching control process, and realizes the segmented impedance self-matching method by adjusting the respective digital potentiometers, which improves the signal transmission accuracy of the airborne cable network of the large catamaran model verification machine, and improves the transmission quality of the communication, driving and power supply signals.

Claims

1. A method for self-matching of segmental impedance of airborne cable network for a two-body model verification machine, characterized in that, The twin-body model verification machine sets multiple separation surfaces to divide the airborne cable network into multiple cable segments, and impedance self-matching units are arranged at each separation surface; The impedance self-matching unit comprises a voltage sensor, a current sensor, a signal acquisition circuit, a signal processing module, a core control unit and a digital potentiometer. The voltage sensor and the current sensor acquire voltage and current information and transmit the information to the signal acquisition circuit, the signal acquisition circuit transmits the received voltage and current information to the signal processing module, the signal processing module receives the voltage and current information, converts the information into digital signals and transmits the digital signals to the core control unit, the core control unit receives the digital signals, performs calculation and issues a control signal to the digital potentiometer, and the digital potentiometer reads the control signal, adjusts the output impedance value of each load loop and matches the impedance of the cable. The method for impedance self-matching of each impedance self-matching unit comprises the following steps: Step S1: acquiring the change rates of voltage and current in the ground state; Step S2: acquiring the change rates of voltage and current of multiple sampling points in the air state, and then calculating the average values of the change rates of voltage and current; Step S3: performing difference calculation on the average values of the change rates of voltage and current obtained in step S2 and the change rates of voltage and current in the ground state obtained in step S1 to obtain a deviation rate; Step S4: if the deviation rate obtained in step S3 is greater than 10%, impedance self-matching is started, the matching resistance is dynamically adjusted until the deviation rate is less than 10%.

2. The method according to claim 1, wherein the method is characterized by, The core control unit is connected to a flight control computer through a communication module.

3. The method of claim 1, wherein the method is characterized by: The airborne cable network is divided into left fuselage cable (11), right fuselage cable (12), left wing cable (13), right wing cable (14), left vertical tail cable (15), horizontal tail cable (16) and tail rotor cable (17).

4. The method of claim 1, wherein the method is characterized by: TVS clamping diodes and absorption capacitors are arranged at both ends of the digital potentiometer.

5. The method of claim 1, wherein the method is characterized by: Two adjacent impedance self-matching units are connected through a multi-core electric connector with a locking mechanism and a multi-core cable.

6. The method of claim 5, wherein the method further comprises: A shielding layer is arranged in the wrapping layer of the multi-core cable.

7. The segmented impedance self-matching method for an airborne cable network used in a dual-body model verification machine according to claim 1, characterized in that, Before step S1, an initial matching resistance value is acquired, and if the difference obtained in step S3 is greater than 10% of the change rate of voltage and current in the ground state, the matching resistance is dynamically adjusted on the basis of the initial matching resistance value.

8. The method of claim 7, wherein the method further comprises: The calculation formula of the initial matching resistance value is: ； wherein R c is an initial matching resistance value; L is an inductance; and C is a capacitance.

9. The method of claim 1, wherein the method is used for a two-body model verification machine, and the method is characterized in that, The calculation formula of the change rate of voltage and current is: ； ； where U is the voltage at both ends of the cable section; L is the inductance; is the rate of change of current; I is the current flowing through the cable; C is the capacitance; is the rate of change of voltage.

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