A solid rocket standard engine single-channel multi-sensor switching calibration device and method

Abstract

The application provides a solid rocket standard engine single-channel multi-sensor switching calibration device and method, which comprises an upper computer, a data acquisition device and a switching device. The switching device comprises a first relay unit composed of multiple independent relays, which is used for connecting the power supply end of the measured pressure sensor with the power supply and the power supply end of the data acquisition device. The switching device also comprises a second relay unit composed of multiple independent relays, and the signal port of the measured pressure sensor is connected with the signal port of the data acquisition device. A logic control module is also provided. The logic control unit controls the action of the relay connected with the measured pressure sensor through an output control signal, controls the on-off of the measured pressure sensor and the acquisition channel of the data acquisition device, and through the man-machine interaction interface of the upper computer, the sensor to be calibrated can be switched and selected, the calibration of multiple sensors is completed synchronously through a single acquisition channel, the calibration process is optimized, the calibration efficiency is improved, the calibration result is accurate, and the test requirements are met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of test and measurement, and particularly relates to a solid rocket standard engine single-channel multi-sensor switching calibration device and method. BACKGROUND

[0002] In various types of test and measurement, sensors need to be carried for physical state collection. Common sensors include pressure sensors, thrust sensors, displacement sensors, temperature sensors, strain sensors, etc. Common sensor types are divided into two categories: with power supply and without power supply. To ensure the accuracy of test data, sensors generally need to be calibrated before testing. According to the calibration requirements and calibration procedures of the aerospace industry standard QJ28A-98 "Pressure Sensor Static Performance Uncertainty Calibration Method", one calibration process needs to be performed for 3 cycles, and the number of calibration steps is not less than 6.

[0003] In view of the test requirement of gapless operation of the standard engine automatic test line, four sensors are rotated on the test line at the same time, one sensor is in the test process, and three sensors are in the waiting area. After the current engine ignition is completed, the sensor used in this test enters the waiting area, and the sensor already in the waiting area enters the next test. Before testing, the four sensors need to be calibrated, and the calibration content includes the overall calibration of the sensor, the test cable and the test equipment and channel. After calibration, the sensor, cable and test channel must be consistent with the calibration condition during the test. The number of test products of the test line is in the hundreds per day. According to the above requirements, the four sensors used on the test day have two calibration modes. The first mode is to use four test channels corresponding to four sensors, which can realize the simultaneous calibration of four sensors. When calibrating, the oil pressure machine operator only needs to complete one calibration process according to the calibration requirements. However, after each calibration is completed, the test personnel need to judge the sensor information entering the next test according to the sensor rotation, change the test channel each time, reset the acquisition configuration and replace the test long cable, and the next test can be carried out only after the matching is correct, which increases the judgment and cable configuration time of the operator and is not conducive to the automation process. The second mode is to always use the same acquisition channel, and the four sensors are connected to the channel in turn for calibration. The operator does not need to judge and change the channel configuration in the test software, and does not need to replace the test cable, which improves the automation efficiency. However, when calibrating, the sensor needs to be connected to the acquisition channel in turn, and the calibration process needs to be repeated four times. The oil pressure machine operator needs to complete four calibration processes according to the calibration requirements. This increases the test preparation time and workload.

[0004] No matter which way is adopted, it increases the test link and the intervention frequency of the operator, reduces the automation degree and increases the system complexity. SUMMARY

[0005] The purpose of this invention is to solve the problems of complex and low automation in existing sensor calibration procedures, and to provide a single-channel multi-sensor switching calibration device and method for a solid rocket standard engine.

[0006] To achieve the above objectives, the technical solution provided by this invention is:

[0007] A single-channel multi-sensor switching calibration device for a standard solid rocket engine is characterized by comprising a host computer, a data acquisition device, and a switching device. The host computer is used to output a switching control signal according to a switching command to control the switching device to connect or disconnect the pressure sensor under test, and to output an acquisition control signal according to an acquisition command to control the data acquisition device to acquire the voltage value of the pressure sensor under test under pressurized conditions.

[0008] The single acquisition channel of the data acquisition device includes a power port and a signal port. The power port includes a positive power terminal V+ and a negative power terminal V-. The signal port includes a positive signal terminal S+ and a negative signal terminal S-.

[0009] Define the number of pressure sensors to be measured as n. The power supply ports of the pressure sensors to be measured include positive voltage V+ and negative voltage V-, and the signal ports include positive signal S+ and negative signal S-.

[0010] The switching device includes a first relay unit, a second relay unit, a logic control unit, and a DC regulated power supply;

[0011] The first relay unit includes 2n independent relays, which are used to connect the power supply port of the pressure sensor under test to the power supply ports of the DC regulated power supply and the data acquisition device to supply power to the pressure sensor under test; each pair of relays corresponds to one pressure sensor under test, the normally closed terminals of the two relays are respectively connected to the positive and negative terminals of the DC regulated power supply, the common terminal is respectively connected to the positive voltage V+ and negative voltage V- of the corresponding pressure sensor under test, and the normally open terminals are respectively connected to the positive voltage V+ and negative voltage V- of the data acquisition device;

[0012] The second relay unit includes 2n independent relays for connecting the signal port of the pressure sensor under test to the signal port of the data acquisition device; each pair of relays corresponds to one pressure sensor under test, and the normally open terminals of the two relays are respectively connected to the positive signal S+ and negative signal S- of the corresponding pressure sensor under test, and the common terminal is respectively connected to the positive signal V+ and negative signal V- of the data acquisition device.

[0013] The logic control unit comprises a plurality of signal output ports, which are connected to the coil interfaces of the relays in the first relay unit and the second relay unit; the logic control unit can output a high-level signal according to the received switching control signal to control the corresponding relay to act.

[0014] Further, the first relay unit and the second relay unit are composed of a plurality of independent relays or adopt a relay group.

[0015] Further, the signal output ports of the logic control unit are connected to the coil interfaces of the relays in the first relay unit and the second relay unit in sequence, respectively, or a single signal output port is connected to the coil interfaces of a plurality of relays connected to the same measured pressure sensor.

[0016] Further, the relays in the first relay unit and the second relay unit are isolated by an optoelectronic isolation method.

[0017] A solid rocket standard engine single-channel multi-sensor switching calibration method is realized by using the switching calibration device, comprising the following steps:

[0018] Step 1: Turn on the DC voltage stabilizer to power all measured pressure sensors for preheating;

[0019] Step 2: According to the pressure range of the measured pressure sensor, set the number of calibration steps, step values, acquisition channels, and storage paths;

[0020] Step 3: In the first step value of the pressurized state, collect the voltage data of each measured pressure sensor, specifically including:

[0021] Step 3.1: According to the set first step value, pressurize the measured pressure sensor;

[0022] Step 3.2: Input the switching instruction, and the upper computer outputs the switching control signal to the logic control unit according to the switching instruction; the logic control unit outputs a high-level signal according to the received switching control signal to trigger the normally open end of the relay corresponding to the selected measured pressure sensor to close, so that the selected measured pressure sensor is connected to the data acquisition device;

[0023] The relays connected to other measured sensors remain inactive at the normally closed contact and are always in the powered state;

[0024] Step 3.3: Input the acquisition instruction, and the upper computer outputs the acquisition control signal to the data acquisition device according to the acquisition instruction; the data acquisition device collects the voltage data of the selected measured pressure sensor at the first step value and uploads it to the upper computer;

[0025] Step 3.4, repeat step 3.1-step 3.3, collect the voltage data of other measured pressure sensors under the same step value and upload to the host computer under the pressure state;

[0026] Step 4, execute step 3, pressurize the measured pressure sensor according to the set other step value and collect the voltage data; until the voltage data collection of each measured pressure sensor under all step values is completed;

[0027] Step 5, the host computer outputs the calibration data table according to the received voltage data.

[0028] The advantages of the present application are:

[0029] 1, the method of the present application is designed by switching device, the switching device includes a plurality of independent relays comprising a first relay unit, for connecting the positive and negative electrodes of the measured pressure sensor with the power supply and the power supply end of the data acquisition module, and a second relay unit composed of a plurality of independent relays, for connecting the signal port of the measured pressure sensor with the signal port of the data acquisition device, through the control signal output by the logic control unit, the on-off of the relay is controlled, the on-off of the measured pressure sensor and the data acquisition device acquisition channel is independently controlled, the calibration of multiple sensors is realized by single acquisition channel, the calibration process is optimized, and the calibration efficiency is improved.

[0030] 2, through test verification, the application device can meet the calibration requirements of the uncertainty of the sensor, the calibration coefficient is within the coefficient distribution interval of the measured pressure sensor, the calibration result is accurate, and the test requirements are met.

[0031] 3, the single acquisition channel-multiple sensor switching calibration device proposed by the present application realizes the calibration requirement of synchronously calibrating multiple pressure sensors by using only one acquisition channel in the automatic test line, and reduces the repeated number of operators.

[0032] 4, the present application has universality and is suitable for the case of synchronously calibrating multiple sensors by using a single acquisition channel, in actual design, whether the measured pressure sensor needs power supply working requirement, the first relay unit and the direct current stabilized power supply for power supply are retained or removed.

[0033] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0035] Figure 1The application is a single-channel multi-sensor switching calibration device for solid rocket standard engine

[0036] Figure 2 The application is a single-channel multi-sensor switching calibration device for solid rocket standard engine DETAILED DESCRIPTION

[0037] The embodiments of the application are described in detail below, which are exemplary and intended to explain the application, and cannot be understood as a limitation of the application.

[0038] The single-channel multi-sensor switching calibration device of the application is described in detail below by taking the calibration test of four pressure sensors as an example. In practice, the number of sensors to be calibrated can be increased or decreased according to actual needs. The pressure sensors to be measured include a first sensor, a second sensor, a third sensor and a fourth sensor, and each single sensor has four connection terminals, i.e., signal positive electrode S+, signal negative electrode S-, voltage positive electrode V+ and voltage negative electrode V-.

[0039] Referring to Figure 1 The application is a single-channel multi-sensor switching calibration device for solid rocket standard engine

[0040] The switching device includes a first relay unit, a second relay unit, a logic control unit and a direct current voltage stabilizer. In actual use, the data acquisition device can select any one channel from the multiple acquisition channels as the acquisition channel for this test. After the acquisition channel is selected, the acquisition channel is connected with the switching device. The switching device includes a set of first relay units, second relay units, logic control units and direct current voltage stabilizers corresponding to the selected acquisition channel. The first relay unit is used to connect the power supply port of the pressure sensor to be measured with the direct current voltage stabilizer and the power supply port of the data acquisition device to supply power to the pressure sensor to be measured.

[0041] For the 4 sensor synchronization calibration requirements proposed in this embodiment, 16 relays are needed. In this embodiment, two relay units, a first relay unit and a second relay unit, are used. Each relay unit can be composed of multiple independent relays or a relay group. In this embodiment, each relay unit contains 8 independent relays, and each relay is mutually isolated by optical isolation. To achieve physical isolation of the sensor signal and power supply, the power supply wiring of the sensor is in the first relay unit, and the signal wiring of the sensor is in the second relay unit.

[0042] The first relay unit includes relays 101, 102, 103, 104, 105, 106, 107, and 108, which are independent of each other. The common terminal of relay 101 is connected to the positive voltage V+ of the first sensor, the normally closed terminal is connected to the positive voltage V+ of the DC voltage stabilizer, and the normally open terminal is connected to the positive voltage V+ of the data acquisition device. The common terminal of relay 102 is connected to the negative voltage V- of the first sensor, the normally closed terminal is connected to the negative voltage V- of the DC voltage stabilizer, and the normally open terminal is connected to the negative voltage V- of the data acquisition device. The common terminal of relay 103 is connected to the positive voltage V+ of the second sensor, the normally closed terminal is connected to the positive voltage V+ of the DC voltage stabilizer, and the normally open terminal is connected to the positive voltage V+ of the data acquisition device. The common terminal of relay 104 is connected to the negative voltage V- of the second sensor, the normally closed terminal is connected to the negative voltage V- of the DC voltage stabilizer, and the normally open terminal is connected to the negative voltage V- of the data acquisition device. The common terminal of relay 105 is connected to the positive voltage V+ of the third sensor, the normally closed terminal is connected to the positive voltage V+ of the DC voltage stabilizer, and the normally open terminal is connected to the positive voltage V+ of the data acquisition device. The common terminal of relay 106 is connected to the negative voltage V- of the third sensor, the normally closed terminal is connected to the negative voltage V- of the DC voltage stabilizer, and the normally open terminal is connected to the negative voltage V- of the data acquisition device. The common terminal of relay 107 is connected to the positive voltage V+ of the fourth sensor, the normally closed terminal is connected to the positive voltage V+ of the DC voltage stabilizer, and the normally open terminal is connected to the positive voltage V+ of the data acquisition device. The common terminal of relay 108 is connected to the negative voltage V- of the fourth sensor, the normally closed terminal is connected to the negative voltage V- of the DC voltage stabilizer, and the normally open terminal is connected to the negative voltage V- of the data acquisition device.

[0043] The second relay unit includes relays 201, 202, 203, 204, 205, 206, 207, and 208, which are independent of each other.

[0044] Relay 201 is commonly connected to the signal negative pole S- of the data acquisition device, and is commonly connected to the signal negative pole S- of the first sensor; relay 202 is commonly connected to the signal positive pole S+ of the data acquisition device, and is commonly connected to the signal positive pole S+ of the first sensor; relay 203 is commonly connected to the signal negative pole S- of the data acquisition device, and is commonly connected to the signal negative pole S- of the second sensor; relay 204 is commonly connected to the signal positive pole S+ of the data acquisition device, and is commonly connected to the signal positive pole S+ of the second sensor; relay 205 is commonly connected to the signal negative pole S- of the data acquisition device, and is commonly connected to the signal negative pole S- of the third sensor; relay 206 is commonly connected to the signal positive pole S+ of the data acquisition device, and is commonly connected to the signal positive pole S+ of the third sensor; relay 207 is commonly connected to the signal negative pole S- of the data acquisition device, and is commonly connected to the signal negative pole S- of the fourth sensor; relay 208 is commonly connected to the signal positive pole S+ of the data acquisition device, and is commonly connected to the signal positive pole S+ of the fourth sensor.

[0045] The logic control module is used for controlling the on-off of the four sensors and the first relay unit and the second relay unit. The four sensors are connected with 16 relays in total, so 16 control signals need to be set. The logic control module can be selected from PLC, integrated control card, DSP and other types of products with control function. The logic control module comprises 16 output ends, which are port 0-port 15 respectively, and are connected with the coil interfaces of the relays 101, 102, 201, 202, 103, 104, 203, 204, 105, 106, 205, 206, 107, 108, 207 and 208 in sequence respectively. When the logic control module outputs the control signals through the output ports 0-3, the power supply line and the signal line of the first sensor are connected with the power supply line and the signal line of the data acquisition device through the relays 101, 102, 201 and 202 respectively, so that the data acquisition device can acquire the voltage data of the first sensor, and the second sensor, the third sensor and the fourth sensor are preheated by the DC voltage stabilizing source; when the logic control module outputs the control signals through the output ports 4-7, the power supply line and the signal line of the second sensor are connected with the power supply line and the signal line of the data acquisition device through the relays 103, 104, 203 and 204 respectively, so that the data acquisition device can acquire the voltage data of the second sensor, and the first sensor, the third sensor and the fourth sensor are preheated by the DC voltage stabilizing source; when the logic control module outputs the control signals through the output ports 8-11, the power supply line and the signal line of the third sensor are connected with the power supply line and the signal line of the data acquisition device through the relays 105, 106, 205 and 206 respectively, so that the data acquisition device can acquire the voltage data of the third sensor, and the first sensor, the second sensor and the fourth sensor are preheated by the DC voltage stabilizing source; when the logic control module outputs the control signals through the output ports 12-15, the power supply line and the signal line of the fourth sensor are connected with the power supply line and the signal line of the data acquisition device through the relays 107, 108, 207 and 208 respectively, so that the data acquisition device can acquire the voltage data of the fourth sensor, and the first sensor, the second sensor and the third sensor are preheated by the DC voltage stabilizing source.

[0046] According to actual needs, when the output voltage of the output port of the logic control module meets the control voltage of the coil action of the relay, the coil interfaces of the multiple relays of the same measured pressure sensor can be connected with the same output port of the logic control module, so that the high level signal output through one output port can control two, three or four relays of the same measured pressure sensor to be connected and work at the same time.

[0047] Before calibration, according to the actual needs of the test, first select the acquisition channel on the data acquisition device, configure the acquisition channel amplification multiple. The following describes the process of synchronously calibrating four sensors using the switching calibration device of the present application:

[0048] Step 1, preheat the measured pressure sensor power supply;

[0049] When the data acquisition device is connected with the logic control module, the normally closed contact of all relays remains unchanged, and the power supply end of the four sensors is connected in parallel to the 10V stabilized voltage source, that is, the normally closed end of the 8 relays of the first relay unit is connected with the 10V stabilized voltage source. After testing, the voltage of each sensor is stabilized at 9.8V when multiple sensors are connected in parallel, which meets the power supply requirements of the sensor, and this state is stable for 10 minutes to preheat the power supply of the sensor.

[0050] Step 2, after preheating, according to the pressure range of the measured pressure sensor, set the number of calibration steps, step value, acquisition channel and storage path through the man-machine interface of the upper computer.

[0051] When calibrating the sensor, the measured pressure sensor needs to be pressurized by a standard pressure supply device such as an oil hydraulic machine, the pressure step value is set according to the industry standard calibration requirements, the measured sensor is sequentially increased with standard pressure, and then the voltage value under different pressures is collected at the current pressure step value. Taking 6 steps and a step value of 1000 as an example, the generated acquisition list has a total of 36 rows, the step value is 0, 1000, 2000, 3000, 4000, 5000, 5000, 4000, 3000, 2000, 1000, 0, and repeated 3 times.

[0052] Step 3, calibrate the measured pressure sensor.

[0053] When the oil press gives a step value of 0, the switching instruction of the first sensor collection mode is input through the man-machine interface of the upper computer, the upper computer outputs the switching control signal, the logic control module receives the switching control signal of the upper computer, the logic control module only has pins 0-3 to output high level, the normally open contacts of the relays 101, 102, 201 and 202 are closed, and the remaining relays keep the normally closed contacts inaction. At this time, the first sensor is connected with the data collection device, the man-machine interface of the upper computer displays the voltage signal of the first sensor in the pressurization process, the signals of the remaining three pressure sensors are disconnected, the voltage positive and negative poles V+ and V- are connected in parallel to the 10V voltage stabilizing source through the normally closed ends of the relays 103, 104, 105, 106, 107 and 108, and the power supply state is kept. The collection instruction is input through the man-machine interface, the upper computer outputs the collection control signal to the data collection device, the data collection device starts to collect the voltage of the first sensor, obtains the voltage data of the first sensor under the current step and uploads to the upper computer.

[0054] The step value 0 is kept, the second sensor collection mode is switched through the man-machine interface of the upper computer, the upper computer outputs, the upper computer outputs the switching control signal, the logic control module receives the switching control signal of the upper computer, the logic control module only has pins 4, 5, 6 and 7 to output high level, the normally open contacts of the relays 103, 104, 203 and 204 are closed, and the remaining relays keep the normally closed contacts inaction. At this time, the second sensor is directly connected with the data collection device, the man-machine interface of the upper computer displays the voltage signal value of the second sensor, the signal positive and negative poles S+ and S- of the first sensor, the third sensor and the fourth sensor are disconnected, the voltage positive and negative poles V+ and V- are connected in parallel to the 10V voltage stabilizing source through the normally closed ends of the relays 101, 102, 105, 106, 107 and 108, and the power supply state is kept. The collection control instruction is input through the man-machine interface, the upper computer outputs the collection control signal to the data collection device, the data collection device starts to collect the voltage of the second sensor. The voltage data of the second sensor under the current step is obtained and uploaded to the upper computer.

[0055] The state of keeping the step value 0 is switched to the third sensor collection mode through the man-machine interaction interface of the upper computer, the upper computer outputs, the upper computer outputs the switching control signal, the logic control module receives the switching control signal of the upper computer, the logic control module only has the pins 8, 9, 10 and 11 output high level, the normally open contacts of the relays 105, 106, 205 and 206 are closed, and the remaining relays keep the normally closed contacts inaction. At this time, the third sensor is directly connected with the data collection device, the signal value of the third sensor is displayed on the man-machine interaction interface of the upper computer, the signal positive pole S+ and the signal negative pole S- of the first sensor, the second sensor and the fourth sensor are disconnected, the voltage positive pole V+ and the voltage negative pole V- are connected in parallel to the 10V voltage stabilizer through the normally closed ends of the relays 101, 102, 103, 104, 107 and 108, and the power supply state is kept. The collection control instruction is input through the man-machine interaction interface, the upper computer outputs the collection control signal to the data collection device, and the data collection device starts to collect the voltage of the third sensor. The voltage data of the third sensor under the current step is obtained and uploaded to the upper computer.

[0056] The state of keeping the step value 0 is switched to the fourth sensor collection mode through the man-machine interaction interface of the upper computer, the upper computer outputs, the upper computer outputs the switching control signal, the logic control module receives the switching control signal of the upper computer, the logic control module only has the pins 12, 13, 14 and 15 output high level, the normally open contacts of the relays 107, 108, 207 and 208 are closed, and the remaining relays keep the normally closed contacts inaction. At this time, the fourth sensor is directly connected with the data collection device, and the voltage value of the fourth sensor is displayed through the man-machine interaction interface. The signal positive pole S+ and the signal negative pole S- of the first sensor, the second sensor and the third sensor are disconnected, the voltage positive pole V+ and the voltage negative pole V- are connected in parallel to the 10V voltage stabilizer through the normally closed ends of the relays 101, 102, 103, 104, 105 and 106, and the power supply state is kept. The collection control instruction is input through the man-machine interaction interface, the upper computer outputs the collection control signal to the data collection device, and the data collection device starts to collect the voltage of the fourth sensor. The voltage data of the fourth sensor under the current step is obtained and uploaded to the upper computer.

[0057] The sensor collection sequence can be changed under the same step value, and only the state conversion of the relays is needed to be completed through the corresponding switching module of the man-machine interaction interface of the upper computer.

[0058] Step 4, under the same step value, after the voltage values of the four sensors are collected, the oil press is pressed to the next step value, and the process of step 3 is repeated to complete the voltage value collection under the step value.

[0059] Step 5, after collecting the voltage data of the pressure sensor at all step values, the host computer forms a calibration data table of the four sensors, and outputs the calibration results.

[0060] When the device is tested, the data acquisition channel and the file storage path of the data acquisition device can be selected according to the test requirements. The acquisition results of the four sensors are independent, each sensor is selected through its corresponding switching unit, and the current value data can be collected or cancelled during the acquisition process. Each acquisition channel of the data acquisition device can set multiple relays connected with the sensors according to the number of sensors that need to be calibrated synchronously, so as to realize the connection requirement of multiple sensors and the same acquisition channel.

[0061] Effect verification:

[0062] In the same calibration test environment, calibration data is collected, and part of the data results are shown in Table 1. Serial number 1 is the calibration result without the switching device, and serial numbers 2-6 are the calibration results with the switching device. The characters in the table are explained as follows: K is the calibration coefficient, A is the calibration uncertainty, R is the repeatability, H is the hysteresis, L is the linearity, a is the intercept, and the relative error is the relative error percentage of the calibration coefficient of serial numbers 2-6 to the calibration coefficient of serial number 1.

[0063] Table 1 Comparison of calibration results

[0064] Serial number K A R H L a Relative error % 1 13045.54 0.07 0.06 0.04 0.05 5.40 / 2 13048.67 0.13 0.08 0.08 0.09 8.51 0.024 3 13056.75 0.10 0.07 0.05 0.07 7.60 0.086 4 13051.24 0.05 0.03 0.03 0.05 5.20 0.044 5 13044.86 0.08 0.05 0.03 0.05 8.49 0.005 6 13052.06 0.08 0.05 0.02 0.06 3.98 0.050

[0065] As can be seen from Table 1, the calibration uncertainty is within 3‰, which meets the calibration requirements; the relative error of the calibration coefficient compared with the switching device is within <0.9‰. By referring to the historical calibration data of the sensor, the calibration coefficient ranges between 13039-13060, and after adding the calibration switching device, the calibration results are all within the calibration coefficient band range of the sensor, the calibration results are available, and the results can be used for test analysis, and the data results are reliable.

[0066] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A solid rocket standard motor single channel multi-sensor switching calibration device, characterized in that, The switching calibration device comprises a host computer, a data acquisition device and a switching device, the host computer is used for outputting a switching control signal according to a switching instruction to control the switching device to connect or disconnect the measured pressure sensor, and outputting an acquisition control signal according to an acquisition instruction to control the data acquisition device to acquire the voltage value of the measured pressure sensor under pressure; The single-channel acquisition channel of the data acquisition device comprises a power supply port and a signal port, the power supply port comprises a power supply positive pole V+ and a power supply negative pole V-, and the signal port comprises a signal positive pole S+ and a signal negative pole S-; The number of the measured pressure sensors is defined as n, the power supply port of the measured pressure sensor comprises a voltage positive pole V+ and a voltage negative pole V-, and the signal port comprises a signal positive pole S+ and a signal negative pole S-; The switching device comprises a first relay unit, a second relay unit, a logic control unit and a direct-current voltage stabilizer; The first relay unit comprises 2n independent relays, which are used for connecting the power supply port of the measured pressure sensor with the direct-current voltage stabilizer and the power supply port of the data acquisition device to supply power to the measured pressure sensor; each two relays correspond to one measured pressure sensor, the normally closed ends of the two relays are respectively connected with the positive pole and the negative pole of the direct-current voltage stabilizer, the common ends are respectively connected with the voltage positive pole V+ and the voltage negative pole V- of the corresponding measured pressure sensor, and the normally open ends are respectively connected with the voltage positive pole V+ and the voltage negative pole V- of the data acquisition device; The second relay unit comprises 2n independent relays, which are used for connecting the signal port of the measured pressure sensor with the signal port of the data acquisition device; each two relays correspond to one measured pressure sensor, the normally open ends of the two relays are respectively connected with the signal positive pole S+ and the signal negative pole S- of the corresponding measured pressure sensor, and the common ends are respectively connected with the signal positive pole V+ and the signal negative pole V- of the data acquisition device; The logic control unit comprises a plurality of signal output ports, the signal output ports are connected with the coil interfaces of the relays in the first relay unit and the second relay unit; the logic control unit can output a high-level signal according to the received switching control signal to control the corresponding relays to act.

2. The switching calibration device of claim 1, wherein, The first relay unit and the second relay unit are composed of a plurality of independent relays or adopt a relay group.

3. The switching calibration device of claim 2, wherein, The coil interfaces of the relays in the first relay unit and the second relay unit are connected with the signal output ports of the logic control unit in sequence, or a single signal output port is connected with the coil interfaces of a plurality of relays connected with the same measured pressure sensor.

4. The switching calibration device of claim 3, wherein, Each relay in the first relay unit and the second relay unit is mutually isolated by adopting an optical isolation mode.

5. A solid rocket standard motor single channel multi-sensor switching calibration method, characterized in that, The switching calibration device is realized by adopting any one of claims 1-4, and comprises the following steps: Step 1: turning on the direct-current voltage stabilizer to preheat all the measured pressure sensors; Step 2: setting the number of steps, the step value, the acquisition channel and the storage path according to the pressure range of the measured pressure sensor; Step 3: acquiring the voltage data of each measured pressure sensor under the pressure state of the first step value, specifically comprising: Step 3.1: pressurizing the measured pressure sensor according to the set first step value; Step 3.2, input switching instruction, the host computer outputs switching control signal to the logic control unit according to the switching instruction, the logic control unit outputs high level signal according to the received switching control signal, triggers the normally open end of the relay corresponding to the selected measured pressure sensor to close, and the selected measured pressure sensor is in communication with the data acquisition device; The relays connected with other measured sensors keep the normally closed contacts inaction and always keep the power supply state; Step 3.3, input acquisition instruction, the host computer outputs acquisition control signal to the data acquisition device according to the acquisition instruction, the data acquisition device acquires the voltage data of the selected measured pressure sensor under the first step value and uploads to the host computer; Step 3.4, repeat steps 3.1-3.3 to acquire the voltage data of other measured pressure sensors under the same step value and upload to the host computer; Step 4, execute step 3 process, pressurize the measured pressure sensor according to the set other step values and acquire the voltage data; until the voltage data acquisition of each measured pressure sensor under all step values is completed; Step 5, the host computer outputs the calibration data table according to the received voltage data.

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