Multi-parameter measuring circuit for projectile launching water entry test

Abstract

A multi-parameter measurement circuit for a shell launching water entry test comprises a power supply circuit, a control circuit, a pressure detection circuit, an acceleration detection circuit, an angular velocity detection circuit, a TTL trigger acquisition circuit, a secondary ignition circuit, a storage circuit and a communication circuit. The device is installed at the chamber position when a shell body is in a no-load state, directly participates in the test process, collects attitude signals and pressure signals in the process that the shell enters water in real time, records ignition trigger signals and secondary ignition signals at the same time, executes secondary ignition action, provides important technical support for the performance test of the shell, and improves the test efficiency. The method has the advantages of high detection precision and high practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of for cannonball launch into water test multi-parameter measurement circuit, belong to measurement detection technical field. BACKGROUND

[0002] When cannonball launch into water test is carried out, test research under the condition of water entry speed needs to be carried out, to cooperate the smooth development of test, design a multi-parameter measurement circuit is placed in the bore position when cannonball body is empty, for measuring cannonball water entry process attitude signal, pressure signal, simultaneously record ignition trigger signal, secondary ignition signal, and execute secondary ignition action, can the multi-signal of measurement and record be collected and stored, facilitate subsequent analysis, to be used as the verification of cannonball design performance index. UTILITY MODEL CONTENT

[0003] Based on the above situation, the utility model provides a kind of for cannonball launch into water test multi-parameter measurement circuit, installation is in the bore position when cannonball body is empty, real-time acquisition cannonball water entry process attitude signal, pressure signal, simultaneously record ignition trigger signal, secondary ignition signal, and execute secondary ignition action, provide important technical support for the performance test of cannonball.

[0004] To achieve the above goal, the utility model adopts the following technical scheme:

[0005] A kind of for cannonball launch into water test multi-parameter measurement circuit includes power supply circuit, control circuit, pressure detection circuit, acceleration detection circuit, angular velocity detection circuit, TTL trigger acquisition circuit, secondary ignition circuit, storage circuit and communication circuit, wherein power supply circuit is used to control circuit, pressure detection circuit, acceleration detection circuit, angular velocity detection circuit, TTL trigger acquisition circuit, secondary ignition circuit, storage circuit and communication circuit for power supply;Control circuit is electrically connected with pressure detection circuit, acceleration detection circuit, angular velocity detection circuit, TTL trigger acquisition circuit, secondary ignition circuit, storage circuit and communication circuit respectively;Pressure detection circuit is used to complete cannonball launch after body pressure measurement;Acceleration detection circuit is used to the acceleration measurement of X, Y, Z three directions of body;Angular velocity detection circuit is used to the angular velocity measurement of X, Y, Z three directions of body;TTL trigger acquisition circuit is used to gather cannonball primary ignition, secondary ignition TTL trigger level signal;Secondary ignition circuit is used to execute cannonball launch after secondary ignition action and gather ignition head signal;Control circuit realizes the read-write of data by storage circuit, and realizes the transmission of data by communication circuit.

[0006] Furthermore, the power supply circuit includes a power supply (such as a lithium battery) for providing 4.2V and 12V voltages, and multiple power management circuits, wherein the multiple power management circuits are used to convert the 4.2V power supply into ±15V, 5V, 3.3V, and 1.25V voltages to power the control circuit, pressure detection circuit, acceleration detection circuit, angular velocity detection circuit, TTL trigger acquisition circuit, secondary ignition circuit, storage circuit, and communication circuit; furthermore, the 12V power supply is used to provide power to the secondary ignition circuit.

[0007] Furthermore, the pressure detection circuit includes multiple pressure sensors and a first operational amplifier circuit. The pressure sensors collect the projectile pressure signal, which is then processed by the first operational amplifier circuit and output to the control circuit for electrical connection. Specifically, the pressure sensors include multiple pressure sensors for measuring multi-point pressure data. The multiple first operational amplifier circuit collects the signals from the multiple pressure sensors, processes the signals, and outputs them to the input terminal of the control circuit.

[0008] Furthermore, the acceleration detection circuit includes an acceleration sensor and three sets of second operational amplifier circuits. The acceleration signals of the projectile in the X, Y, and Z directions collected by the acceleration sensor are processed by the three sets of second operational amplifier circuits and then output to the input terminal of the control circuit.

[0009] Furthermore, the angular velocity detection circuit includes an angular velocity sensor and three sets of second operational amplifier circuits. The angular velocity sensor collects the angular velocity signals of the projectile in the X, Y, and Z directions. After the signals are processed by the three sets of second operational amplifier circuits, the signals are output to the input terminal of the control circuit.

[0010] Furthermore, the TTL trigger acquisition circuit mainly includes two sets of third operational amplifier circuits to process the TTL trigger signal and acquire the primary ignition TTL trigger signal and the secondary ignition TTL trigger signal. The two sets of third operational amplifier circuits acquire the primary ignition TTL trigger signal and the secondary ignition TTL trigger signal respectively, process them, and output them to the input terminal of the control circuit.

[0011] Further, the secondary ignition circuit mainly comprises an ignition power supply part, an ignition head circuit part and a fourth operational amplifier circuit part: the ignition power supply part is powered by a 12V power supply provided by a power supply circuit; the ignition head circuit part mainly comprises a transistor, a field effect transistor and an ignition head, the transistor, the field effect transistor and the ignition head are electrically connected, a control circuit output control signal controls the transistor to work, the transistor controls the field effect transistor to be turned on, thereby controlling the ignition head to perform an ignition action; the fourth operational amplifier circuit part collects an ignition head signal, after signal processing by an operational amplifier circuit formed by an operational amplifier, the signal is output to an input end of the control circuit.

[0012] Further, the storage circuit completes reading and writing of data by managing an external flash memory chip through the control circuit.

[0013] Further, the communication circuit completes data transmission by managing a serial communication chip through the control circuit.

[0014] Further, the control circuit mainly comprises a microprocessor, which is used for controlling the whole circuit to work, collecting a pressure signal of the pressure detection circuit, collecting an acceleration signal of the acceleration detection circuit, collecting an angular velocity signal of the angular velocity detection circuit, collecting a primary ignition TTL trigger signal and a secondary ignition TTL trigger signal of the TTL trigger collection circuit, collecting an ignition head signal of the secondary ignition circuit and storing the ignition head signal in a flash memory chip arranged in the storage circuit, simultaneously performing a secondary ignition action through an output level, after the test is finished, test data can be acquired by reading the flash memory chip arranged in the storage circuit, and data uploading analysis can be performed by connecting a host computer through the communication circuit.

[0015] Beneficial effects: the utility model provides a kind of for cannonball launch into water test multi-parameter measurement circuit, it is installed in the bore position of cannonball body empty load time, directly participate in test process while having following functions: 1.through detecting cannonball launch process cannonball three-axis acceleration signal and three-axis angular velocity signal real-time acquisition cannonball into water process attitude signal;2.real-time acquisition cannonball launch process cannonball pressure signal;3.through the acquisition primary ignition TTL trigger signal, secondary ignition TTL trigger signal, verify the time threshold set in advance, i.e. the delay time of two ignitions;4.through secondary ignition circuit acquisition secondary ignition signal can be recorded by control circuit internal timer ignition head burnout time;These data provide important technical support for the performance test of cannonball, with higher detection precision and stronger practicality. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described in detail in connection with the drawings.

[0017] Figure 1 It is the circuit structure diagram of the utility model;

[0018] Figure 2a is the power supply circuit of the utility model: the 4.2V voltage of lithium battery BAT is converted into ±15V voltage output principle diagram;

[0019] Figure 2b is the power supply circuit of the utility model: the 4.2V voltage of lithium battery BAT is converted into 5V voltage output principle diagram;

[0020] Figure 2c is the power supply circuit of the utility model: the 4.2V voltage of lithium battery BAT is converted into 3.3V voltage output principle diagram;

[0021] Figure 2d is the power supply circuit of the utility model: first voltage reference circuit principle diagram;

[0022] Figure 2e is the power supply circuit of the utility model: second voltage reference circuit principle diagram;

[0023] Figure 3a is the first operational amplifier circuit principle diagram of the utility model;

[0024] Figure 3b is the first operational amplifier circuit principle diagram of the utility model 7 groups;

[0025] Figure 4a is the second operational amplifier circuit principle diagram of the utility model;

[0026] Figure 4b is the second operational amplifier circuit principle diagram of the utility model 3 groups;

[0027] Figure 5a is the TTL trigger acquisition circuit principle diagram of the utility model;

[0028] Figure 5b is the TTL trigger acquisition circuit principle diagram of the utility model 2 groups;

[0029] Figure 6 is the secondary ignition circuit principle diagram of the utility model;

[0030] Figure 7 is the storage circuit principle diagram of the utility model;

[0031] Figure 8 is the communication circuit principle diagram of the utility model;

[0032] Figure 9 is the control circuit principle diagram of the utility model;

[0033] Figure 1The circuit consists of: 1. Power supply circuit; 2. Control circuit; 3. Pressure detection circuit; 4. Acceleration detection circuit; 5. Angular velocity detection circuit; 6. TTL trigger acquisition circuit; 7. Secondary ignition circuit; 8. Storage circuit; 9. Communication circuit. Detailed Implementation

[0034] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 The circuit shown is a multi-parameter measurement circuit for a projectile launch and water entry test. It mainly includes a power supply circuit 1, a control circuit 2, a pressure detection circuit 3, an acceleration detection circuit 4, an angular velocity detection circuit 5, a TTL trigger acquisition circuit 6, a secondary ignition circuit 7, a storage circuit 8, and a communication circuit 9. The measurement circuit is installed in the chamber position of the projectile body when it is unloaded. It directly participates in the projectile launch and water entry test process, and at the same time, it acquires the attitude signal and pressure signal of the projectile during the water entry process, records the ignition trigger signal and the secondary ignition signal, and executes the engine secondary ignition action to achieve real-time, online, and continuous detection.

[0036] The power supply circuit 1 includes a power supply for providing 4.2V and 12V voltages, and multiple power management circuits. The multiple power management circuits are used to convert the 4.2V power supply into ±15V, 5V, 3.3V, and 1.25V voltages to power the control circuit 2, pressure detection circuit 3, acceleration detection circuit 4, angular velocity detection circuit 5, TTL trigger acquisition circuit 6, secondary ignition circuit 7, storage circuit 8, and communication circuit 9. The 4.2V input voltage is provided by a lithium battery. The power supply circuit 1 further includes a 12V input power supply, provided by the lithium battery, to provide ignition power to the secondary ignition circuit 7.

[0037] The control circuit 2 is electrically connected to the pressure detection circuit 3, acceleration detection circuit 4, angular velocity detection circuit 5, TTL trigger acquisition circuit 6, secondary ignition circuit 7, storage circuit 8, and communication circuit 9 respectively. The control circuit 2 is connected to the storage circuit 8 through a four-channel serial peripheral interface circuit design to achieve high-speed data reading and writing. The control circuit 2 is connected to the communication circuit 9 through a serial communication design to achieve data transmission with the host computer. The control circuit 2 is configured to acquire pressure signals, acceleration signals, angular velocity signals, TTL trigger signals, and ignition signals from the pressure detection circuit 3, acceleration detection circuit 4, angular velocity detection circuit 5, TTL trigger acquisition circuit 6, and secondary ignition circuit 7 through its internal ADC port configuration, and simultaneously outputs a secondary ignition signal to control the secondary ignition circuit 7 to perform the secondary ignition action.

[0038] like Figure 2aThe multiple power management circuits include two groups of identical boost converter circuits composed of boost converters U7 and U12, which are responsible for converting the input voltage of 4.2V of the lithium battery BAT into ±15V voltage output. Two groups of boost converter circuits are adopted mainly to increase the current in the circuit. Taking the boost converter circuit composed of the boost converter U7 as an example, the boost converter circuit composed of the boost converter U12 is the same:

[0039] The 6-pin of the boost converter U7 is an input terminal, which is connected to the input voltage of 4.2V of the lithium battery BAT and grounded through the filter capacitor C18. The 5-pin is a control pin, which receives the control signal 15_A and is connected to the I / O pin 19 of the microprocessor U53 of the control circuit 2. The 2-pin is a compensation pin, which is grounded through the external resistor R18 and the capacitor C20. The 1-pin is a feedback pin, which is used to adjust the output voltage to the reference voltage 15V. The resistor R17 and the resistor R19 and the capacitor C16 constitute a feedback network, which feeds back the output voltage +15V to the 1-pin through the voltage division of the resistors R17 and R19. The 3-pin and the 7-pin are grounded, which provide the reference potential of the circuit. The 4-pin is a switch pin, which is connected to the input terminal 6-pin through the inductor L3 and connected to the protection circuit composed of the diodes D1 and D2, which prevents reverse current. When the internal switch of the boost converter U7 is turned on, the current passes through the inductor L3, and the inductor stores energy. At this time, the diode D2 is cut off. When the internal switch of the boost converter U7 is turned off, the current in the inductor L3 cannot change abruptly, and the inductor L3 generates a reverse electromotive force. At this time, the diode D2 is turned on, and the energy in the inductor L3 charges the output capacitors C12 and C13 through the diodes D1 and D2, and at the same time, supplies power to the outside, thereby generating a voltage of -15V at the output terminal. The 4-pin is also connected to the D3 output +15V voltage;

[0040] Preferably, the capacitor C12 is 10μF, the capacitor C13 is 22μF, the capacitor C16 is 10μF, the capacitor C18 is 4.7μF, and the capacitor C20 is 680pF. The inductor L3 is 10μH. The resistor R17 is 200k, the resistor R18 is 10k, and the resistor R19 is 18k.

[0041] As shown in Figure 2b The multiple power management circuits also include a boost converter circuit composed of a boost voltage converter U34 of model TPS61240DRVR, which is responsible for converting the input voltage of 4.2V of the lithium battery BAT into 5V voltage output:

[0042] The 6-pin of the voltage converter U34 is an input terminal, connected to the 4.2V input voltage of the battery BAT, and grounded through the filter capacitor C107; the 5-pin is an inductance pin, connected to the input terminal 6-pin through the inductance L6; the 4-pin is an enable pin, receiving the control signal 5V_EN, high level effective, connected to the I / O pin 78-pin of the microprocessor U53 provided by the control circuit 2; the 2-pin is a power output pin, outputting a fixed 5V voltage, grounded through the capacitor C108, completing the filtering of the output voltage and reducing the ripple of the output voltage; the 3-pin is a feedback pin, connected to the power output pin 2-pin; the 7-pin is a power pin grounded, and the 1-pin is a ground pin;

[0043] Preferably, the capacitor C107 is 2.2μF, and the C108 is 4.7μF; the inductance L6 is 2.2μH.

[0044] As Figure 2c , the plurality of power management circuits further comprise two groups of identical voltage stabilizing circuits composed of voltage stabilizers U0 and U3 of model SP6205EM5_L / TR, responsible for stabilizing the input 4.2V voltage of the lithium battery BAT to 3.3V voltage output; the two groups of voltage stabilizers U0 and U3 respectively constitute digital 3.3V voltage output D3V3 and analog 3.3V voltage output A3V3, ensuring separate power supply for digital voltage and analog voltage; taking the voltage stabilizing circuit composed of the voltage stabilizer U3 as an example, the voltage stabilizing circuit composed of the voltage stabilizer U0 is the same:

[0045] The 1-pin of the voltage stabilizer U3 is an input terminal, connected to the 4.2V input voltage of the battery BAT, and grounded through the filter capacitor C2; the 2-pin is a ground pin; the 3-pin is an enable pin, receiving the 4.2V signal of the BAT, high level effective for a long time; the 4-pin is an adjustment pin, for the voltage stabilizer U3 with a fixed 3.3V output, this pin is not used for voltage adjustment design, directly grounded through the filter capacitor C123; the 5-pin is a power output pin, outputting the analog 3.3V voltage A3V3, grounded through the filter capacitor C4;

[0046] Preferably, the capacitor C2 is 2.2μF, the C4 is 2.2μF, and the C123 is 10nF.

[0047] As Figure 2d , the plurality of power management circuits further comprise a first voltage reference circuit composed of a voltage reference chip U11 of model REF3033, used to provide the microprocessor U53 with a reference voltage REF3V3_B for the internal analog circuit; the 3-pin of the voltage reference chip U11 is a ground pin; the 1-pin is an input pin, connected to the input 4.2V voltage of the lithium battery BAT, and grounded through the filter capacitor C33; the 2-pin is an output pin, outputting a stable 3.3V voltage, filtered by the capacitors C34 and C35, providing the microprocessor U53 with a stable, low-noise 3.3V reference voltage REF3V3_B for the internal analog circuit;

[0048] Preferably, the capacitance C33 is 0.47 μF, C34 is 0.1 μF, and C35 is 1 μF.

[0049] As shown in Figure 2e , the plurality of power management circuits further comprise a second voltage reference circuit composed of an operational amplifier U55 of model OPA333 AIDBVR, for providing a reference voltage +1.25V to the pressure detection circuit 3, the acceleration detection circuit 4, and the angular velocity detection circuit 5, the 2-pin of the operational amplifier U55 being connected to ground; the 5-pin being connected to an analog 3.3V voltage signal A3V3; the 3-pin and the 4-pin being signal input terminals, the 3-pin being connected to a reference voltage RFE3V3_B through a current-limiting resistor R112, and being connected to ground through a resistor R117, for voltage division; the 4-pin being directly connected to the output pin 1-pin to form a voltage follower structure; the 1-pin being an output pin, stably outputting a +1.25V voltage, which is further filtered through a capacitor C146 and a capacitor C147 to remove high-frequency noise in the output voltage, and providing a stable +1.25V reference voltage;

[0050] Preferably, the capacitance C125 is 10 nF, C146 is 0.01 μF, and C147 is 1 μF; the resistor R112 is 18k, and R117 is 11k.

[0051] The pressure detection circuit 3 mainly comprises a pressure sensor and a first operational amplifier circuit: as shown in Figure 3a The first operational amplifier circuit mainly comprises a dual-channel operational amplifier U65 of model OPA2333 PIDSGT, one operational amplifier U65 being capable of completing processing and amplification of two pressure signals, the input signal of the pressure sensor being input into the first operational amplifier circuit through a connector Pre1, and taking the pressure signal processing of the operational amplifier U65.1 as an example, the operational amplifier U65.2 being the same:

[0052] The pressure signal input of the connector Pre1 is connected to the inverting input pin 2-pin of the operational amplifier U65.1 through a resistor R35, and the non-inverting input pin 3-pin is connected to a reference voltage +1.25V through a resistor R39 as a bias voltage, and is connected to ground through a resistor R176, which provides a DC bias point for the input signal, so that the signal can work within the linear range of the operational amplifier U65.1; the 1-pin is an output pin, which is fed back to the input pin 2-pin through a resistor R33 to form a negative feedback loop, and is further filtered to output a pressure signal PRE1 connected to the I / O pin 26-pin of the microprocessor U53 provided in the control circuit 2 through a low-pass filter composed of a resistor R38 and a capacitor C43; the 8-pin is a positive power supply pin, which is connected to an analog voltage A3V3, and is connected to ground through a capacitor C40, for filtering high-frequency noise; the 4-pin is a negative power supply pin directly connected to ground;

[0053] Preferably, the capacitance C40 is 0.1 μF, C43 is 0.1 μF; the resistance R33 is 3k, R35 is 10k, R38 is 1k, R39 is 3k, R176 is 3k.

[0054] As Figure 3b The circuit shown mainly contains 7 groups of first operational amplifier circuits, 7 double-channel operational amplifiers U59, U60, U61, U62, U63, U64, U65 are adopted to complete the processing and amplification of 14 pressure signals, output pressure signals PRE1, PRE2, PRE3, PRE4, PRE5, PRE6, PRE7, PRE8, PRE9, PRE10, PRE11, PRE12, PRE13, PRE14, and connect the I / O pins 26, 27, 31, 34, 38, 39, 40, 41, 42, 43, 53, 54, 55, 56 of the microprocessor U53 provided in the control circuit 2.

[0055] The detection of the posture of the shell launched into water is through the three-axis acceleration signal and the three-axis angular velocity signal as the performance evaluation parameters of the shell posture in the shell launching into water test. The acceleration detection circuit 4 mainly includes a three-axis acceleration sensor and a second operational amplifier circuit, and the angular velocity detection circuit 5 mainly includes a gyroscope sensor and a second operational amplifier circuit. The acceleration sensor and the gyroscope sensor can measure the acceleration signals and angular velocity signals in X, Y, Z three directions. The acceleration detection circuit 4 and the angular velocity detection circuit 5 are also provided with a second operational amplifier circuit. The pressure detection circuit is the same, a double-channel operational amplifier with the model of OPA2333PIDSGT is adopted to complete the acceleration signal measurement and the angular velocity signal measurement in the same direction at one time, such as the operational amplifier U58 shown, which completes the acceleration signal measurement in the X-axis direction and the angular velocity signal measurement in the X-axis direction. Taking the X-axis direction acceleration signal AC_X processed by the operational amplifier U58.1 as an example: Figure 4a

[0056] ​The reverse input pin 2 is connected to the reference voltage +1.25V through the resistance R173 as a bias voltage, while the same phase input pin 3 is connected to the acceleration signal AC_X detected by the acceleration sensor in the X-axis direction through the resistance R5, and is also connected to the ground through the resistance R7 to form a voltage division network for pre-processing the input signal; the pin 1 is an output pin, which is fed back to the input pin 2 through the resistance R172 to form a negative feedback loop to stabilize the gain of the amplifier, and further filters the high-frequency noise through the low-pass filter composed of the resistance R3 and the capacitor C6 to output the processed acceleration signal D_AC_X to the I / O pin 57 of the microprocessor U53 provided in the control circuit 2; the pin 8 is a positive power supply pin connected to the analog voltage A3V3 and connected to the ground through the capacitor C1 for filtering high-frequency noise; and the pin 4 is a negative power supply pin directly connected to the ground.

[0057] Preferably, the capacitor C1 is 0.1 μF, the capacitor C6 is 0.1 μF, the resistance R3 is 1k, the resistance R5 is 100k, the resistance R7 is 180k, the resistance R172 is 100k, and the resistance R173 is 100k.

[0058] As shown in the acceleration detection circuit 4 and the angular velocity detection circuit 5, Figure 4b The acceleration detection circuit 4 and the angular velocity detection circuit 5 mainly contain a set of X, Y, Z three-direction acceleration detection circuits 4 and a set of X, Y, Z three-direction angular velocity detection circuits 5, and three double-channel operational amplifiers U56, U57, U58 are used to complete the processing and amplification of 6 signals, and output three processed acceleration signals D_AC_X, D_AC_Y, D_AC_Z and three angular velocity signals D_TL_X, D_TL_Y, D_TL_Z, and connect the I / O pins 57, 59, 61 and the pins 58, 60, 69 of the microprocessor U53 provided in the control circuit 2.

[0059] As shown in the TTL trigger acquisition circuit 6, Figure 5a The TTL trigger acquisition circuit 6 is used to acquire the ignition trigger signal, mainly contains a third operational method circuit composed of an operational amplifier U39 with a model of OPA333 to complete the processing of the TTL trigger signal, and the pin 2 of the operational amplifier U39 is connected to the ground; the pin 5 is a positive power supply pin connected to the analog voltage A3V3; the pins 3 and 4 of the operational amplifier U39 are signal input ends, the pin 3 is connected to the TTL terminal through the current-limiting resistance R76 and connected to the ground through the resistance R77 to play a voltage division role and pre-process the signal; the pin 4 is a reverse input pin directly connected to the output pin 1 to form a voltage follower structure; the pin 1 is an output pin outputting the regulated TTL signal TTL_TRI_B after current limiting through the resistance R133, and connecting the I / O pin 20 of the microprocessor U53 provided in the control circuit 2, and connecting the RC network composed of the capacitor C137 to the ground to play a role of filtering and signal pre-processing, and can remove the high-frequency noise in the input signal;

[0060] Preferably, the capacitance C137 is 10 nF; the resistance R76 is 2k, R77 is 2k, and R133 is 2k.

[0061] As shown in the TTL trigger acquisition circuit 6, two groups of operational amplifiers U39 and U68 complete the processing and amplification of two TTL trigger signals, and output two TTL trigger signals TTL TRI A and TTL TRI B to the I / O pins 21 and 20 of the microprocessor U53 of the control circuit 2. Figure 5b As shown in the TTL trigger acquisition circuit 6, two groups of operational amplifiers U39 and U68 complete the processing and amplification of two TTL trigger signals, and output two TTL trigger signals TTL TRI A and TTL TRI B to the I / O pins 21 and 20 of the microprocessor U53 of the control circuit 2.

[0062] Figure 6 As shown in the secondary ignition circuit 7, the secondary ignition circuit 7 mainly includes an ignition power supply part 6a, an ignition head circuit part 6b, and a fourth operational amplifier circuit part 6c.

[0063] As shown in the ignition power supply part 6a, the ignition power supply is 12V, which is supplied by a lithium battery, and is used to supply power to the ignition head circuit part 6b. The negative electrode of the ignition power supply is connected to one end of the resistive ignition head FIRE of the ignition head circuit part through a current-limiting resistor Rfire1, and the other end of the resistive ignition head FIRE is connected to the positive electrode of the ignition power supply through a current-limiting resistor Rfire2. Figure 6 The ignition head circuit part 6b mainly includes a transistor Q5 of type S9013, a field effect transistor Q7 of type HSH110P04, and an ignition head FIRE. A control signal FIRE_A is output from the I / O pin 97 of the microprocessor U53 of the control circuit 2, passes through a resistor R191, and is grounded through a resistor R192 to form a voltage division structure. The signal after voltage division is connected to the base of the transistor Q5. The collector of the transistor Q5 is connected to a voltage of 12V through a pull-up resistor R190, and the emitter is grounded. The source of the field effect transistor Q7 is connected to a voltage of 12V, the drain is connected to the ignition head FIRE, and the gate is connected to the collector of the transistor Q5 through a resistor R193. A capacitor C148 is connected between 12V and ground to filter the power supply and stabilize the 12V power supply voltage to ensure reliable operation of the circuit. The resistor R193 is connected between the gate of the field effect transistor Q7 and the collector of the transistor to limit the current and stabilize the gate voltage. Further, when the FIRE_A signal is at a low level, the transistor Q5 is cut off, the gate of the field effect transistor Q7 is pulled up to VCC_12V through R190, the field effect transistor Q7 is cut off, and no current passes through the ignition head FIRE. When the FIRE_A signal is at a high level, the transistor Q5 is turned on, the gate potential of the field effect transistor Q7 is lowered, the field effect transistor Q7 is turned on, the 12V power supply supplies power to the ignition head FIRE through the field effect transistor Q7, and the ignition head FIRE works.

[0064]

[0065] ​​The fourth operational amplifier circuit section 6c mainly includes an OPA333 operational amplifier U33. Pin 3 is the non-inverting input pin, connected to the FRIE signal X_A- at one end of the ignition head via resistor R131, and also grounded via resistor R194. These two resistors form a voltage divider network to preprocess the input signal. Pin 4 is the inverting input pin, directly connected to output pin 1 via a circuit, forming a voltage follower structure. Pin 5 is the positive power supply pin, connected to analog voltage A3V3, and connected to ground via capacitor C105 to filter out high-frequency noise. Pin 2 is the negative power supply pin, directly grounded. Pin 1 is the output pin, connected via resistor R132 and capacitor C10. A low-pass filter composed of 6 components filters out high-frequency noise and outputs a secondary ignition signal FIRE_TRI, which is connected to pin 13 of the microprocessor U53 in the control circuit. Further, when the ignition head FRIE operates, signal X_A- outputs a high level. When the ignition head FRIE burns out, signal X_A- outputs a low level. This signal X_A- is processed by operational amplifier U33 and outputs the secondary ignition signal FIRE_TRI, which is acquired by control circuit 2. The ignition head FRIE ignites, heats up, burns out, and then burns out within a certain time. The internal timer of the microprocessor U53 in control circuit 2 can time this period, which is the secondary ignition time.

[0066] Preferably, capacitor C105 is 0.1μF, C106 is 0.001μF; resistor R131 is 10kΩ, R132 is 1kΩ, and R194 is 20kΩ.

[0067] like Figure 7 The storage circuit 8 shown mainly includes two identical four-channel serial peripheral interface circuits composed of flash memory chips U66 and U67 (model GD25Q128ESIG). These circuits are used to store real-time data collected during the projectile launch and water entry test. Taking flash memory chip U66 as an example, pin 1 is the chip select pin, connected to pin 22 of microprocessor U53; pin 2 is the data output pin, connected to pin 32 of microprocessor U53, used to send data from flash memory chip U66 to microprocessor U53; pin 3 is the write-protect pin, connected to pin 29 of microprocessor U53. When this pin is low, the chip is in write-protected state. Write-protected mode prohibits write operations to the chip. When high, normal write operations are allowed. Pin 4 is the ground pin. Pin 5 is the data input pin, connected to pin 33 of the microprocessor U53, to receive data sent by the microprocessor U53. Pin 6 is the clock pin, connected to pin 47 of the microprocessor U53. When this pin is low, the chip pauses the current operation and enters a hold state until the pin goes high, which can be used to pause data transmission, etc. Pin 8 is the power supply pin, connected to the digital 3.3V voltage D3V3, and grounded and filtered through capacitor C142 (0.01μF).

[0068] likeFigure 8 The communication circuit 9 shown mainly includes a communication interface circuit composed of an RS-485 transceiver U32 of model MAX3485EESA+T, the pin 1 being a receiving output end connected to the pin 71 of the microprocessor U53; the pin 2 being a receiving enable end, low level effective, the pin 3 being a driving enable end, high level effective, connected to the pin 73 of the microprocessor U53; the pin 4 being a data input end connected to the pin 70 of the microprocessor U53; the pin 5 being a ground end; the pins 6 and 7 are bus interface pins, output to the wiring end RS485; the pin 8 being a positive power pin connected to the 3.3V digital power D3V3, further, the resistance R122 is 120Ω, connected between the bus interface pins 6 and 7 as a bus terminal matching resistance, used to eliminate signal reflection on the bus when communicating at a long distance.

[0069] As shown in the control circuit 2, mainly contains a microprocessor U53 of model STM32G473VET6: Figure 9

[0070] The pins 24, 49, 64, 75 and 100 are digital voltage VDD positive power pins connected to the 3.3V digital voltage D3V3;

[0071] The pins 23, 35, 48, 63, 74 and 99 are VSS power ground pins connected to ground;

[0072] The pin 36 is a reference voltage positive input pin connected to the reference voltage REF3V3_B, which provides an accurate positive reference voltage for the analog circuits such as the analog-to-digital converter (ADC) inside the microprocessor U53;

[0073] The pin 37 is an analog power input pin connected to the analog 3.3V voltage A3V3, which provides independent power supply for the analog circuits (such as analog-to-digital converter ADC, digital-to-analog converter DAC, etc.) inside the chip, and is filtered to ground through the capacitor C140;

[0074] The pin 12 is a clock pin connected to the external crystal oscillator X1, which provides a system clock for the microprocessor U53;

[0075] The pin 14 is a reset pin connected to an RC delay circuit composed of the resistance R20 and the capacitor C21;

[0076] The pins 15 and 19 are connected to the enable control pin 5 of the boost converter U12 and U7 of the power supply circuit 1, which is used to enable the boost converter U12 and U7 at high level;

[0077] The pin 78 is connected to the enable control pin 4 of the boost converter U34 of the power supply circuit 1, which is used to enable the boost converter U34 at high level;

[0078] ​26, 27, 31, 34, 38, 39, 40, 41, 42, 43, 53, 54, 55, 56 pins are connected to the output voltage signals PRE1, PRE2, PRE3, PRE4, PRE5, PRE6, PRE7, PRE8, PRE9, PRE10, PRE11, PRE12, PRE13, PRE14 of the operational amplifiers U59, U60, U61, U62, U63, U64, U65 of the pressure detection circuit 3 respectively;

[0079] 57, 59, 61 pins are connected to the three-way acceleration signals D_AC_X, D_AC_Y, D_AC_Z output by the operational amplifiers U56, U57, U58 of the acceleration detection circuit 4 respectively;

[0080] 58, 60, 69 pins are connected to the three-way angular velocity signals D_TL_X, D_TL_Y, D_TL_Z output by the operational amplifiers U56, U57, U58 of the angular velocity detection circuit 5 respectively;

[0081] 21, 20 pins are connected to the output terminals of the TTL trigger acquisition circuit 6 to acquire TTL trigger signals TTL_TRI_A, TTL_TRI_B;

[0082] 13 pin is connected to the secondary ignition signal FIRE_TRI output by the operational amplifier U33 provided in the secondary ignition circuit 7;

[0083] 97 pin outputs the control signal FIRE_A as the input signal of the ignition head circuit part 6b provided in the secondary ignition circuit 7;

[0084] 22, 28, 29, 32, 33, 47 pins are connected to the flash memory chip U66, and 16, 17, 18, 22, 30, 47 pins are connected to the flash memory chip U66, providing two sets of data storage read-write interface design;

[0085] 70, 71, 73 pins are connected to the RS-485 transceiver U32, providing a set of 485 communication interface;

[0086] 76, 77 pins are connected to an external simulation port SW1 for connecting a software debugging emulator;

[0087] 95 pin is connected to the ground after the resistor R157, which is used for default start mode, and the microprocessor U53 starts from the main flash memory every time it is powered on;

[0088] 98 pin is connected to LED1 and resistor R8 to digital voltage 3.3V to form the running indicator light circuit of the microprocessor U53.

[0089] In the test of the cannonball launching into water, the ignition trigger signal is often TTL level signal, after the cannonball is ignited once, it needs to be ignited twice after a certain delay time, the delay time and the second ignition time are important parameters for the subsequent performance evaluation of the cannonball, as shown in Figure 5b 、 Figure 6 、 and Figure 9 When the microprocessor U53 processes, it collects the TTL trigger signal TTL_TRI_A of the first ignition, carries out internal timer timing for a certain delay time threshold, and then sends out the FIRE_A ignition signal, the transistor Q5 of the ignition head circuit part 6b of the second ignition circuit 7 is turned on, so that the second ignition action can be performed, and then the microprocessor U53 collects the output signal of the third operation method circuit 6c of the second ignition circuit 7, so that the second ignition time can be recorded.

[0090] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the above examples do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A multi-parameter measuring circuit for a test of launching a shell into water, characterized in that, The power supply circuit, the control circuit, the pressure detection circuit, the acceleration detection circuit, the angular velocity detection circuit, the TTL trigger acquisition circuit, the secondary ignition circuit, the storage circuit and the communication circuit, wherein the power supply circuit is used for power supply of the control circuit, the pressure detection circuit, the acceleration detection circuit, the angular velocity detection circuit, the TTL trigger acquisition circuit, the secondary ignition circuit, the storage circuit and the communication circuit; the control circuit is electrically connected with the pressure detection circuit, the acceleration detection circuit, the angular velocity detection circuit, the TTL trigger acquisition circuit, the secondary ignition circuit, the storage circuit and the communication circuit; the pressure detection circuit is used for completing the measurement of the shell body pressure in the water test; the acceleration detection circuit is used for measuring the X, Y, Z three direction accelerations of the shell body; the angular velocity detection circuit is used for measuring the X, Y, Z three direction angular velocities of the shell body; the TTL trigger acquisition circuit is used for acquiring the TTL trigger level signals of the primary and secondary ignitions of the shell; the secondary ignition circuit is used for executing the secondary ignition action after the shell is launched and acquiring the ignition head signal; the control circuit realizes the reading and writing of data through the storage circuit and realizes the transmission of data through the communication circuit.

2. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The power supply circuit includes a power supply for providing 4.2V and 12V voltage and a plurality of power management circuits, wherein the plurality of power management circuits are used for converting the 4.2V power supply into ±15V, 5V, 3.3V, 1.25V voltage, and are used for power supply of the control circuit, the pressure detection circuit, the acceleration detection circuit, the angular velocity detection circuit, the TTL trigger acquisition circuit, the secondary ignition circuit, the storage circuit and the communication circuit; further, the 12V power supply is used for providing power supply for the secondary ignition circuit.

3. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 2, characterized in that, The plurality of power management circuits include two groups of same boost converter U7, U12 responsible for converting the input 4.2V voltage into ±15V voltage output; the voltage converter U34 responsible for converting the input 4.2V voltage into 5V voltage output; two groups of voltage stabilizers U0, U3 responsible for stabilizing the input 4.2V voltage to digital 3.3V and analog 3.3V voltage output; the first voltage reference circuit including the voltage reference chip U11, used for providing reference voltage REF3V3_B for the control circuit; the second voltage reference circuit including the operational amplifier U55, used for providing reference voltage +1.25V for the pressure detection circuit, the acceleration detection circuit and the angular velocity detection circuit.

4. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The pressure detection circuit includes a plurality of pressure sensors and a first operational amplifier circuit, wherein the pressure signals collected by the plurality of pressure sensors are processed by the plurality of first operational amplifier circuits and then output to the control circuit, and specifically, the first operational amplifier circuit mainly includes a double-channel operational amplifier with model OPA2333PIDSGT to complete the processing and amplification of the pressure signals, and the output pressure signals are connected to the I / O pin of the microprocessor U53 provided in the control circuit.

5. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The acceleration detection circuit mainly comprises an acceleration sensor and three groups of second operational amplification circuits, and the angular velocity detection circuit mainly comprises a gyroscope sensor and three groups of second operational amplification circuits; the acceleration sensor and the gyroscope sensor can measure acceleration signals and angular velocity signals in X, Y and Z directions; the output signals of the acceleration sensor and the gyroscope sensor are processed by the second operational amplification circuits; the second operational amplification circuit comprises a double-channel operational amplifier OP A2333PIDSGT, and the processed acceleration signals and angular velocity signals are connected to the I / O pin of the microprocessor U53 of the control circuit.

6. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The TTL trigger acquisition circuit mainly comprises two groups of third operational amplification circuits, which complete the processing of TTL trigger signals; the two groups of third operational amplification circuits mainly comprise operational amplifiers U39 and U68 of model OP A333, which complete the processing and amplification of two-way TTL trigger signals and output two-way TTL trigger signals TTL_TRI_A and TTL_TRI_B and are connected to the I / O pin of the microprocessor U53 of the control circuit.

7. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The secondary ignition circuit mainly comprises an ignition power supply part, an ignition head circuit part and a fourth operational amplification circuit part; the ignition power supply part is powered by the 12V power supply provided by the power supply circuit and is used for powering the ignition head circuit part; the negative electrode of the ignition power supply is connected to one end of the resistive ignition head FIRE of the ignition head circuit part through the current-limiting resistor Rfire1; the ignition head circuit part mainly comprises a transistor Q5 of model S9013, a field effect transistor Q7 of model HSH110P04 and the ignition head FIRE; the fourth operational amplification circuit part mainly comprises an operational amplifier U33 of model OP A333; specifically, the control circuit outputs a level signal to control the transistor Q5 to work, the transistor Q5 controls the field effect transistor Q7 to be turned on, thereby controlling the ignition head FIRE to perform an ignition action; the fourth operational amplification circuit part acquires the output signal X_A- of the ignition head FIRE, processes the output signal X_A- through the operational amplifier U33 and outputs a secondary ignition signal FIRE_TRI connected to the I / O pin of the microprocessor U53 of the control circuit.

8. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The storage circuit comprises two groups of four-channel serial peripheral interface circuits composed of flash memory chips U66 and U67 of model GD25Q128ESIG; and the communication circuit mainly comprises a communication interface circuit composed of an RS-485 transceiver U32 of model MAX3485EESA+T.

9. The multi-parameter measuring circuit for the test of the cannonball launching into water according to claim 1, characterized in that, The control circuit mainly comprises a microprocessor U53 of model STM32G473VET6, which is used for controlling the whole circuit to work, collecting the pressure signal of the pressure detection circuit, collecting the acceleration signal of the acceleration detection circuit, collecting the angular velocity signal of the angular velocity detection circuit, collecting the primary ignition TTL trigger signal and the secondary ignition TTL trigger signal of the TTL trigger collection circuit, collecting the ignition head signal of the secondary ignition circuit and storing in the flash memory chip provided in the storage circuit, and simultaneously outputting the level to execute the secondary ignition action, after the test is finished, the test data can be obtained by reading the flash memory chip provided in the storage circuit, and the data can be uploaded and analyzed through the communication circuit connected to the upper computer.

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