CN107561989B - Air data computer detection platform and detection system composed of platform - Google Patents
Air data computer detection platform and detection system composed of platform Download PDFInfo
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- CN107561989B CN107561989B CN201710847738.5A CN201710847738A CN107561989B CN 107561989 B CN107561989 B CN 107561989B CN 201710847738 A CN201710847738 A CN 201710847738A CN 107561989 B CN107561989 B CN 107561989B
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Abstract
The invention discloses an atmospheric data computer detection platform and a detection system consisting of the same, wherein the detection system comprises an adapter module, a back plate, an industrial personal computer module, an aviation bus module, a GPIB module, a program control resistance module and a plurality of multifunctional sub-modules; the backboard is provided with a plurality of aerial sockets matched with the modules; the adapter module, the industrial personal computer module, the aviation bus module, the GPIB module, the program control resistance module and each multifunctional sub-module are connected to the backboard through aerial plugs on the backboard, and signal switching among the modules is achieved through the backboard. The invention provides an atmospheric data computer detection platform and a detection system consisting of the same, which simplify the complexity of the detection platform, improve the compatibility of the detection platform and an atmospheric data computer and are beneficial to improving the accuracy of atmospheric data computer detection.
Description
Technical Field
The invention relates to atmospheric data computer detection, in particular to an atmospheric data computer detection platform and a detection system consisting of the platform.
Background
The air data computer is a multi-input multi-output airborne comprehensive measurement system, also called as an air data center instrument, and calculates more parameters related to air data, such as flight altitude, altitude deviation, lifting speed, real airspeed, indicated airspeed, Mach number change rate, total temperature, real static pressure, atmospheric static temperature, atmospheric density ratio, real attack angle and the like according to a small amount of original information measured by a sensor, such as static pressure, total temperature, attack angle and the like, and the parameters are sent to airborne systems such as cockpit display, flight control, navigation, engine control, fire control and the like, so that the air data computer has great significance in the field of aerospace.
In order to ensure the comprehensive performance of the air data computer, a detection platform is required to be constructed to test the air data computer, however, the detection platform often comprises a plurality of modularized devices, the modularized devices are often connected through communication lines, so that the detection platform needs a large amount of wiring, the structure is complex, meanwhile, one detection platform often needs to support the detection of different types of air data computers, the number of signals of the air data computers is large, the range difference is large, and the situation that the detection platform is incompatible with the air data computers is easy to occur.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an atmospheric data computer detection platform and a detection system consisting of the platform, so that the complexity of the detection platform is simplified, the compatibility of the detection platform and an atmospheric data computer is improved, and the accuracy of atmospheric data computer detection is improved.
The purpose of the invention is realized by the following technical scheme: an atmospheric data computer detection platform comprises an adapter module, a back plate, an industrial personal computer module, an aviation bus module, a GPIB module, a program control resistance module and a plurality of multifunctional sub-modules; the backboard is provided with a plurality of aerial sockets matched with the modules; the adapter module, the industrial personal computer module, the aviation bus module, the GPIB module, the program control resistance module and each multifunctional sub-module are connected to the backboard through the aviation plug on the backboard, and signal switching among the modules is realized through the backboard;
the adapter module is used for connecting an external atmospheric data computer, realizing data interaction between the detection platform and the atmospheric data computer and finishing signal conditioning in the data interaction process;
the industrial personal computer module is a data processing center of the detection platform and is used for controlling the whole detection platform, completing the calling of each module and receiving information from the air data computer to realize the detection of the air data computer;
the aviation bus module is used for supporting each module to communicate through aviation plug and managing a communication bus according to an instruction of the industrial personal computer module;
the GPIB module is used for outputting a standard air pressure source control signal outwards according to the instruction of the industrial personal computer module;
the program control resistor module is used for providing a required resistance value for the detection platform under the instruction of the industrial personal computer;
the multifunctional submodule is used for providing various data channels for the detection platform.
The air data computer detection platform further comprises a power supply module, wherein the power supply module is connected with the back plate and used for supplying power to the modules through the switching of the back plate.
Preferably, each of the multifunctional sub-modules includes an AD acquisition unit, a DA output unit, an RS422 serial port communication unit, an LVDS communication unit, and an IO port communication unit. AD acquisition unit contains 6 ways AD acquisition channels, DA output unit includes 4 ways DA output channel, RS422 serial port communication unit includes 4 ways RS422 serial ports, LVDS communication unit includes 4 ways LVDS interface, IO mouth communication unit includes 16 ways IO mouths.
The adapter module comprises a detection platform connector, a signal conditioning device and an atmospheric machine connector; the signal conditioning device comprises an analog quantity input conditioning unit, an analog quantity output conditioning unit and a discrete quantity acquisition conditioning unit; the analog input conditioning unit acquires analog input data from the atmospheric data computer through an atmospheric machine connector, and transmits the conditioned analog input data to the detection platform through a detection platform connector; the discrete quantity acquisition conditioning unit acquires discrete quantity data from the atmospheric data computer through the atmospheric machine connector, and transmits the discrete quantity data to the detection platform through the detection platform connector after conditioning; the analog output conditioning unit acquires analog data from the detection platform through the detection platform connector, and transmits the conditioned analog data to the atmospheric data computer through the atmospheric machine connector.
Preferably, the analog input conditioning unit comprises a conditioning input port, an attenuation circuit, a filter circuit, a voltage follower circuit and a conditioning output port;
the conditioning input port receives an analog signal from an atmospheric data computer through an atmospheric machine connector, the conditioning input port is sequentially connected with an attenuation circuit, a filter circuit and a voltage follower circuit to condition the analog signal from the atmospheric data computer, the voltage follower circuit transmits the conditioned analog signal to a conditioning output port, and the conditioning output port transmits the conditioned analog signal to a detection platform of the atmospheric data computer through a detection platform connector;
the attenuation circuit comprises a first resistor R1 and a second resistor R2, the filter circuit comprises a third resistor R3 and a capacitor C1, and the voltage follower circuit comprises an operational amplifier; one end of a first resistor R1 is connected with the conditioning input port, the other end of the first resistor R1 is grounded through a second resistor R2, the common end of the first resistor R1 and the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the non-inverting input end of the operational amplifier, one end of a capacitor C1 is connected between the third resistor R3 and the voltage follower circuit, and the other end of the capacitor C1 is grounded; the output end of the operational amplifier is connected with the inverting input end of the operational amplifier, and the output end of the operational amplifier is also connected with the conditioning output port; the analog input conditioning unit further comprises a voltage stabilizing circuit and a fourth resistor R4, wherein the voltage stabilizing circuit comprises a bidirectional TVS (transient voltage suppressor), one end of the TVS is connected between the conditioning input end and the attenuation circuit, and the other end of the TVS is grounded; the fourth resistor R4 is disposed between the output of the operational amplifier and the conditioning output port.
Preferably, the analog output conditioning unit comprises a differential positive input port, a differential negative input port, a differential signal conditioning circuit and a single-ended output port; the differential positive-direction input port and the differential negative-direction input port receive analog quantity differential signals from the detection platform through the detection platform connector; the differential signal conditioning circuit comprises an operational amplifier chip AD 8676; the differential positive-phase input port is connected with the + INA pin of the operational amplifier chip through a fifth resistor R5, and a second capacitor C2 which is grounded is connected between the fifth resistor R5 and the + INA pin of the operational amplifier chip; the differential negative input port is grounded, and an-INA pin of the operational amplifier chip is grounded through a sixth resistor R6; the VCC-pin of the operational amplifier chip is connected with a power supply of-12V, the OUTA pin of the operational amplifier chip is connected with the + INB pin of the operational amplifier chip through an eighth resistor R8, and the common end of the sixth resistor R6 and the INA pin of the operational amplifier chip is connected between the OUTA pin of the operational amplifier chip and an eighth resistor R8 through a seventh resistor R7; the VCC + pin of the operational amplifier chip is connected with a 12V power supply; a fifth capacitor C5 which is grounded is also connected between the + INB pin of the operational amplifier chip and the eighth resistor R8; the OUTB pin and the-INB pin of the operational amplifier chip are connected to a common point, the common point is connected with the single-ended output port, and the single-ended output port transmits the conditioned analog signal to the atmosphere data computer through the atmosphere machine connector; a third capacitor C3 and a fourth capacitor C4 which are grounded are connected between a VCC-pin of the operational amplifier chip and a power supply of-12V, and the third capacitor C3 and the fourth capacitor C4 are grounded in parallel; a sixth capacitor C6 and a seventh capacitor C7 which are grounded are connected between a VCC + pin of the operational amplifier chip and a 12V power supply; and the sixth capacitor C6 and the seventh capacitor C7 are grounded in parallel.
Preferably, the discrete quantity acquisition conditioning unit comprises a discrete quantity input port, an optical coupler, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first on-off control device J1, a second on-off control device J2 and a discrete quantity output port;
a first input end of the optical coupler is connected with a 27V power supply through a second on-off control device J2 and an eleventh resistor R11 in sequence, and a second input end of the optical coupler is grounded; the first output end of the optical coupler is connected with a 5V power supply through a tenth resistor R10, and the second output end of the optical coupler is grounded; the discrete quantity input port receives a discrete quantity signal from an atmospheric data computer through an atmospheric machine connector, the discrete quantity input port is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected between a first input end of an optical coupler and a second on-off control device J2, and the first on-off control device J1 is connected to two ends of a ninth resistor R9 in parallel; the discrete magnitude output port is connected between a first output end of the optocoupler and a tenth resistor R10 and used for transmitting the conditioned discrete magnitude signal to a detection platform of the atmospheric data computer through a detection platform connector; the first on-off control device is a jumper or a double-pole relay, and the second on-off control device J2 is a jumper or a double-pole relay.
The detection system formed by the atmospheric data computer detection platform comprises the detection platform, a standard air pressure source and an atmospheric data computer; the output end of the detection platform is connected with a standard air pressure source, and the output end of the standard air pressure source is connected with an atmospheric data computer; the detection platform is also connected with an atmospheric data computer;
the detection platform sends a control instruction to the standard air pressure source, transmits a test instruction and an analog signal to the air data computer, and detects the air data computer according to test data fed back by the air data computer;
the standard air pressure source provides air pressure for the air data computer according to the control instruction of the detection platform;
and the atmospheric data computer obtains a plurality of test data according to the test instruction and the analog signal of the detection platform under the air pressure provided by the standard air pressure source, and feeds the test data back to the detection platform.
The invention has the beneficial effects that: in the invention, each module inside is switched over with data and power supply through the back plate, so that complicated internal wiring is not needed, and the complexity of the detection platform is simplified; the adapter module is used for finishing data interaction between the detection platform and the air data computer and finishing signal conditioning in the data interaction process, so that the compatibility of the detection platform and the air data computer is improved, and the accuracy of detection of the air data computer is improved.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of an analog input conditioning unit;
FIG. 3 is a schematic circuit diagram of an analog output conditioning unit;
FIG. 4 is a schematic circuit diagram of a discrete quantity acquisition conditioning unit;
FIG. 5 is a schematic block diagram of an inspection system comprised of an inspection platform.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, an atmospheric data computer detection platform includes an adapter module, a backplane, an industrial personal computer module, an aviation bus module, a GPIB module, a program-controlled resistance module, and a plurality of multi-functional sub-modules; the backboard is provided with a plurality of aerial sockets matched with the modules; the adapter module, the industrial personal computer module, the aviation bus module, the GPIB module, the program control resistance module and each multifunctional sub-module are connected to the backboard through the aviation plug on the backboard, and signal switching among the modules is realized through the backboard;
the adapter module is used for connecting an external atmospheric data computer, realizing data interaction between the detection platform and the atmospheric data computer and finishing signal conditioning in the data interaction process;
the industrial personal computer module is a data processing center of the detection platform and is used for controlling the whole detection platform, completing the calling of each module and receiving information from the air data computer to realize the detection of the air data computer;
the aviation bus module is used for supporting each module to communicate through aviation plug and managing a communication bus according to an instruction of the industrial personal computer module;
the GPIB module is used for outputting a standard air pressure source control signal outwards according to the instruction of the industrial personal computer module;
the program control resistor module is used for providing a required resistance value for the detection platform under the instruction of the industrial personal computer;
the multifunctional submodule is used for providing various data channels for the detection platform.
The air data computer detection platform further comprises a power supply module, wherein the power supply module is connected with the back plate and used for supplying power to the modules through the switching of the back plate. In the embodiment of the application, the power supply module can directly contain 12V and 5V power supply modules; the detection platform can also comprise an alternating current-to-direct current voltage reduction circuit which receives 220V alternating current voltage, reduces the voltage to 12V direct current voltage, obtains 5V voltage through the conversion of a DC-DC circuit, and finally supplies power to the whole detection platform by using 12V and 5V power supplies.
In the embodiment of the application, each multifunctional submodule comprises an AD acquisition unit, a DA output unit, an RS422 serial port communication unit, an LVDS communication unit and an IO port communication unit. AD acquisition unit contains 6 ways AD acquisition channels, DA output unit includes 4 ways DA output channel, RS422 serial port communication unit includes 4 ways RS422 serial ports, LVDS communication unit includes 4 ways LVDS interface, IO mouth communication unit includes 16 ways IO mouths.
The adapter module comprises a detection platform connector, a signal conditioning device and an atmosphere machine connector; the signal conditioning device comprises an analog quantity input conditioning unit, an analog quantity output conditioning unit and a discrete quantity acquisition conditioning unit; the analog input conditioning unit acquires analog input data from the atmospheric data computer through an atmospheric machine connector, and transmits the conditioned analog input data to the detection platform through a detection platform connector; the discrete quantity acquisition conditioning unit acquires discrete quantity data from the atmospheric data computer through the atmospheric machine connector, and transmits the discrete quantity data to the detection platform through the detection platform connector after conditioning; the analog output conditioning unit acquires analog data from the detection platform through the detection platform connector, and transmits the conditioned analog data to the atmospheric data computer through the atmospheric machine connector.
As shown in fig. 2, the analog input conditioning unit includes a conditioning input port, an attenuation circuit, a filter circuit, a voltage follower circuit, and a conditioning output port;
the conditioning input port receives an analog signal from an atmospheric data computer through an atmospheric machine connector, the conditioning input port is sequentially connected with an attenuation circuit, a filter circuit and a voltage follower circuit to condition the analog signal from the atmospheric data computer, the voltage follower circuit transmits the conditioned analog signal to a conditioning output port, and the conditioning output port transmits the conditioned analog signal to a detection platform of the atmospheric data computer through a detection platform connector;
the attenuation circuit comprises a first resistor R1 and a second resistor R2, the filter circuit comprises a third resistor R3 and a capacitor C1, and the voltage follower circuit comprises an operational amplifier; one end of a first resistor R1 is connected with the conditioning input port, the other end of the first resistor R1 is grounded through a second resistor R2, the common end of the first resistor R1 and the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the non-inverting input end of the operational amplifier, one end of a capacitor C1 is connected between the third resistor R3 and the voltage follower circuit, and the other end of the capacitor C1 is grounded; the output end of the operational amplifier is connected with the inverting input end of the operational amplifier, and the output end of the operational amplifier is also connected with the conditioning output port.
The analog input conditioning unit further comprises a voltage stabilizing circuit and a fourth resistor R4, wherein the voltage stabilizing circuit comprises a bidirectional TVS (transient voltage suppressor), one end of the TVS is connected between the conditioning input end and the attenuation circuit, and the other end of the TVS is grounded; the voltage stabilizing circuit plays a role in stabilizing voltage of signals input by an air data computer on one hand, and can inhibit transient surges (transient surges during starting and closing or transient surges under the condition of lightning) on the other hand to protect the circuit, and the fourth resistor R4 is arranged between the output end of the operational amplifier and the conditioning output port; the resistor is used as a current limiting resistor and mainly plays a role in circuit protection.
The analog quantity is input into a conditioning unit, the model of a TVS (transient voltage suppressor) tube is 1.5SMC30A, and the operational amplifier adopts an OPA2277UA chip; in this embodiment, the pins 1, 5 and 8 of the chip OPA2277UA are floating, the pin 3 of the chip OPA2277UA is the non-inverting input terminal of the operational amplifier, the third resistor R3 is connected, the pin 7 is connected to the power supply of 12V, the pin 4 is connected to the power supply of-12V, and the pin 6 is the output terminal of the operational amplifier and is respectively connected to the conditioning output port and the pin 2 of the chip (the inverting input terminal of the operational amplifier).
Because the external signals of the atmospheric data computer have more types, the levels are different from 0-28V, the actual acquisition range of the detection platform is only 10V, effective data can be measured in the range through attenuation, and the equipment can be damaged when the range is over; in the conditioning process of the analog input conditioning unit, firstly, signals input by the air data computer are attenuated and adjusted through the attenuation circuit, so that the signals are filtered and voltage-followed within the acquisition range of the inspection platform, and then the conditioned signals are transmitted to the inspection platform for processing, so that effective data can be conveniently acquired by the inspection platform, and the test of the air data computer is realized. The attenuation circuit is realized by resistance voltage division, the attenuation of signals is mainly determined by the ratio of a first resistor R1 to a second resistor R2, and different attenuation ratios are possibly needed when computers with different atmospheric data are conditioned to control the attenuated signals within the acquisition range of the inspection platform. Therefore, the analog input conditioning unit can facilitate the detection platform to acquire effective data, and realize the test of the atmospheric data computer.
As shown in fig. 3, in the embodiment of the present application, the analog output conditioning unit includes a differential positive input port sign +, a differential negative input port sign-, a differential signal conditioning circuit, and a single-ended output port sign out; the differential positive input port sign + and the differential negative input port sign + receive analog quantity differential signals from a detection platform through a detection platform connector; the differential signal conditioning circuit comprises an operational amplifier chip AD 8676; the differential positive-phase input port sign + is connected with the + INA pin (3 pin) of the operational amplifier chip through a fifth resistor R5, and a second capacitor C2 which is grounded is connected between the fifth resistor R5 and the + INA pin (3 pin) of the operational amplifier chip; the sign-grounding of the differential negative input port is realized, and an INA pin (2 pin) of the operational amplifier chip is grounded through a sixth resistor R6; a VCC-pin (4 pin) of the operational amplifier chip is connected with a power supply of-12V, an OUTA pin (1 pin) of the operational amplifier chip is connected with a + INB pin (5 pin) of the operational amplifier chip through an eighth resistor R8, and a common end of the sixth resistor R6 and an INA pin (2 pin) of the operational amplifier chip is connected between the OUTA pin (1 pin) of the operational amplifier chip and an eighth resistor R8 through a seventh resistor R7; the VCC + pin (8 pins) of the operational amplifier chip is connected with a 12V power supply; a fifth capacitor C5 which is grounded is also connected between the + INB pin (pin 5) of the operational amplifier chip and the eighth resistor R8; an OUTB pin (7 pin) and an INB pin (6 pin) of the operational amplifier chip are connected to a common point, the common point is connected with a single-ended output port sign out, and the single-ended output port transmits the conditioned analog signal to an atmosphere data computer through an atmosphere machine connector. In this embodiment, a third capacitor C3 and a fourth capacitor C4 which are grounded are connected between a VCC-pin of the operational amplifier chip and a-12V power supply, and the third capacitor C3 and the fourth capacitor C4 are grounded in parallel; a sixth capacitor C6 and a seventh capacitor C7 which are grounded are connected between a VCC + pin of the operational amplifier chip and a 12V power supply; and the sixth capacitor C6 and the seventh capacitor C7 are grounded in parallel. In the working process, because the differential negative input port sign is grounded, and meanwhile, an INA pin (2 pin) of the operational amplifier chip is grounded through a sixth resistor R6, namely a differential negative signal is connected to the INA pin (2 pin) of the chip through a sixth resistor R6 to form differential input, and the differential signal is converted into a single-ended signal through an analog output conditioning circuit; in addition, in the signal conditioning process, the fifth resistor R5 and the second capacitor C2 mainly play a role in filtering input signals, and the eighth resistor R8 and the fifth capacitor C5 mainly play a role in filtering output signals, so that the signal conditioning performance is improved; in some cases, the fifth resistor R5 and the eighth resistor R8 may select a resistance of 1K, the first capacitor C2 may select a capacitance of 0.1uf, and the fifth capacitor C5 may select a capacitance of 100 pf. And the common end of the sixth resistor R6 and the INA pin (2 pin) of the operational amplifier chip is connected between the OUTA pin (1 pin) of the operational amplifier chip and the eighth resistor R8 through a seventh resistor R7, so that the sixth resistor R6 and the seventh resistor R7 can perform a gain adjustment function, and the gain multiple is a ratio of R7 to R6, for example, when R7 is 100K and R6 is 50K, the gain multiple is twice. The fourth capacitor C4 and the sixth capacitor C6 may adopt 0.1uf capacitors, which mainly play a role in decoupling power supply and prevent current surge generated in a power supply circuit from affecting normal operation of the circuit when the chip is switched on and off, and the third capacitor C3 and the seventh capacitor C7 may adopt 10uf capacitors, which mainly play a role in power supply filtering. Therefore, the analog output conditioning unit can convert the differential analog signal output by the test platform into a single-ended signal and then transmit the single-ended signal to the air data computer, and meanwhile, the analog output conditioning unit can play the roles of filtering and gain adjustment on the signal.
As shown in fig. 4, the discrete quantity acquisition conditioning unit includes a discrete quantity input port, an optical coupler, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first on-off control device J1, a second on-off control device J2, and a discrete quantity output port;
a first input end of the optical coupler is connected with a 27V power supply through a second on-off control device J2 and an eleventh resistor R11 in sequence, and a second input end of the optical coupler is grounded; the first output end of the optical coupler is connected with a 5V power supply through a tenth resistor R10, and the second output end of the optical coupler is grounded; the discrete quantity input port receives a discrete quantity signal from an atmospheric data computer through an atmospheric machine connector, the discrete quantity input port is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected between a first input end of an optical coupler and a second on-off control device J2, and the first on-off control device J1 is connected to two ends of a ninth resistor R9 in parallel; the discrete magnitude output port is connected between a first output end of the optical coupler and a tenth resistor R10 and used for transmitting the conditioned discrete magnitude signals to a detection platform of the atmosphere data computer through a detection platform connector. The first on-off control device is a jumper or a double-pole relay, and the second on-off control device J2 is a jumper or a double-pole relay. The optical coupler is a TLP126 chip, a first input end and a second input end of the optical coupler are light emitting diode ends of the optical coupler, a first output end and a second output end of the optical coupler are three-stage tube ends of the optical coupler, in the TLP126 chip, the light emitting diode ends are composed of a first diode and a second diode connected with the first diode in parallel, the second diode is a light emitting diode, the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the anode of the first diode is used as a first input end of the optical coupler, and the cathode of the first diode is used as a second input end of the optical coupler; and a collector of the third-stage pipe end is used as a first output end of the optical coupler, and a transmitter of the third-stage pipe end is used as a second output end of the optical coupler.
The working principle of the discrete quantity acquisition conditioning unit is as follows: when the discrete magnitude input signal Di + is at a high/low level, the first on-off control device J1 and the second on-off control device J2 are turned off, at the moment, if the input signal Di + is at the high level, the light emitting diode end of the optical coupler works, the triode end is turned on, and the output signal D-out after conditioning is at a low level of 0V; if the input signal Di + is at a low level, the end of a light-emitting diode of the optical coupler does not work, and the end of the three-stage tube is cut off, then the conditioned output signal D-out is at a high level of 5V;
when the discrete magnitude input signal is an earth/on signal, the first on-off control device J1 and the second on-off control device J2 are closed, if the input signal Di + is an earth signal, the light emitting diode end of the optical coupler does not work, the three-stage tube end is cut off, the output signal D-out after conditioning is at a high level of 5V, if the input signal Di + is an open-circuit signal, the light emitting diode end of the optical coupler works, the three-stage tube end is connected, and the output signal D-out after conditioning is at a low level of 0V.
Therefore, the discrete magnitude acquisition conditioning unit can condition discrete signals from the atmospheric data computer, convert the discrete signals into uniform high-low level signals and supply the detection platform to acquire the discrete magnitude signals, so that the detection platform can be compatible with different types of discrete magnitude signals, and the test work of the detection platform is facilitated.
As shown in fig. 5, in the embodiment of the present application, the detection system composed of the air data computer detection platform includes the detection platform, a standard air pressure source, and an air data computer; the output end of the detection platform is connected with a standard air pressure source, and the output end of the standard air pressure source is connected with an atmospheric data computer; the detection platform is also connected with an atmospheric data computer;
the detection platform sends a control instruction to the standard air pressure source, transmits a test instruction and an analog signal to the air data computer, and detects the air data computer according to test data fed back by the air data computer;
the standard air pressure source provides air pressure for the air data computer according to the control instruction of the detection platform;
and the atmospheric data computer obtains a plurality of test data according to the test instruction and the analog signal of the detection platform under the air pressure provided by the standard air pressure source, and feeds the test data back to the detection platform.
In conclusion, the modules in the detection platform are switched between data and power supplies through the back plate, complex internal wiring is not needed, and the complexity of the detection platform is simplified; the adapter module is used for finishing data interaction between the detection platform and the air data computer and finishing signal conditioning in the data interaction process, so that the compatibility of the detection platform and the air data computer is improved, and the accuracy of air data computer detection is improved.
Claims (7)
1. An atmospheric data computer test platform, its characterized in that: the system comprises an adapter module, a back plate, an industrial personal computer module, an aviation bus module, a GPIB module, a program control resistance module and a plurality of multifunctional sub-modules; the backboard is provided with a plurality of aerial sockets matched with the modules; the adapter module, the industrial personal computer module, the aviation bus module, the GPIB module, the program control resistance module and each multifunctional sub-module are connected to the backboard through the aviation plug on the backboard, and signal switching among the modules is realized through the backboard;
the adapter module is used for connecting an external atmospheric data computer, realizing data interaction between the detection platform and the atmospheric data computer and finishing signal conditioning in the data interaction process;
the industrial personal computer module is a data processing center of the detection platform and is used for controlling the whole detection platform, completing the calling of each module and receiving information from the air data computer to realize the detection of the air data computer;
the aviation bus module is used for supporting each module to communicate through aviation plug and managing a communication bus according to an instruction of the industrial personal computer module;
the GPIB module is used for outputting a standard air pressure source control signal outwards according to the instruction of the industrial personal computer module;
the program control resistor module is used for providing a required resistance value for the detection platform under the instruction of the industrial personal computer;
the multifunctional submodule is used for providing various data channels for the detection platform;
the adapter module comprises a detection platform connector, a signal conditioning device and an atmosphere machine connector; the signal conditioning device comprises an analog quantity input conditioning unit, an analog quantity output conditioning unit and a discrete quantity acquisition conditioning unit; the analog input conditioning unit acquires analog input data from the atmospheric data computer through an atmospheric machine connector, and transmits the conditioned analog input data to the detection platform through a detection platform connector; the discrete quantity acquisition conditioning unit acquires discrete quantity data from the atmospheric data computer through the atmospheric machine connector, and transmits the discrete quantity data to the detection platform through the detection platform connector after conditioning; the analog output conditioning unit acquires analog data from the detection platform through the detection platform connector, and transmits the conditioned analog data to the atmospheric data computer through the atmospheric machine connector;
the discrete quantity acquisition conditioning unit comprises a discrete quantity input port, an optical coupler, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first on-off control device J1, a second on-off control device J2 and a discrete quantity output port;
a first input end of the optical coupler is connected with a 27V power supply through a second on-off control device J2 and an eleventh resistor R11 in sequence, and a second input end of the optical coupler is grounded; the first output end of the optical coupler is connected with a 5V power supply through a tenth resistor R10, and the second output end of the optical coupler is grounded; the discrete quantity input port receives a discrete quantity signal from an atmospheric data computer through an atmospheric machine connector, the discrete quantity input port is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected between a first input end of an optical coupler and a second on-off control device J2, and the first on-off control device J1 is connected to two ends of a ninth resistor R9 in parallel; the discrete magnitude output port is connected between a first output end of the optocoupler and a tenth resistor R10 and used for transmitting the conditioned discrete magnitude signal to a detection platform of the atmospheric data computer through a detection platform connector; the first on-off control device is a jumper or a double-pole relay, and the second on-off control device J2 is a jumper or a double-pole relay; the discrete magnitude acquisition conditioning unit can condition discrete signals from an atmospheric data computer, converts the discrete signals into uniform high-low level signals, and is used for the detection platform to acquire the discrete magnitude signals, so that the detection platform can be compatible with different types of discrete magnitude signals, and the test work of the detection platform is facilitated.
2. An air data computerized inspection platform according to claim 1, wherein: the power supply module is connected with the back plate and supplies power to the modules through the switching of the back plate.
3. An air data computerized inspection platform according to claim 1, wherein: each multifunctional submodule comprises an AD acquisition unit, a DA output unit, an RS422 serial port communication unit, an LVDS communication unit and an IO port communication unit.
4. An air data computerized inspection platform according to claim 3 wherein: AD acquisition unit contains 6 ways AD acquisition channels, DA output unit includes 4 ways DA output channel, RS422 serial port communication unit includes 4 ways RS422 serial ports, LVDS communication unit includes 4 ways LVDS interface, IO mouth communication unit includes 16 ways IO mouths.
5. An air data computerized inspection platform according to claim 1, wherein: the analog input conditioning unit comprises a conditioning input port, an attenuation circuit, a filter circuit, a voltage follower circuit and a conditioning output port;
the conditioning input port receives an analog signal from an atmospheric data computer through an atmospheric machine connector, the conditioning input port is sequentially connected with an attenuation circuit, a filter circuit and a voltage follower circuit to condition the analog signal from the atmospheric data computer, the voltage follower circuit transmits the conditioned analog signal to a conditioning output port, and the conditioning output port transmits the conditioned analog signal to a detection platform of the atmospheric data computer through a detection platform connector;
the attenuation circuit comprises a first resistor R1 and a second resistor R2, the filter circuit comprises a third resistor R3 and a capacitor C1, and the voltage follower circuit comprises an operational amplifier; one end of a first resistor R1 is connected with the conditioning input port, the other end of the first resistor R1 is grounded through a second resistor R2, the common end of the first resistor R1 and the second resistor R2 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the non-inverting input end of the operational amplifier, one end of a capacitor C1 is connected between the third resistor R3 and the voltage follower circuit, and the other end of the capacitor C1 is grounded; the output end of the operational amplifier is connected with the inverting input end of the operational amplifier, and the output end of the operational amplifier is also connected with the conditioning output port; the analog input conditioning unit further comprises a voltage stabilizing circuit and a fourth resistor R4, wherein the voltage stabilizing circuit comprises a bidirectional TVS (transient voltage suppressor), one end of the TVS is connected between the conditioning input end and the attenuation circuit, and the other end of the TVS is grounded; the fourth resistor R4 is disposed between the output of the operational amplifier and the conditioning output port.
6. An air data computerized inspection platform according to claim 1, wherein: the analog output conditioning unit comprises a differential positive-phase input port, a differential negative-phase input port, a differential signal conditioning circuit and a single-ended output port; the differential positive-direction input port and the differential negative-direction input port receive analog quantity differential signals from the detection platform through the detection platform connector; the differential signal conditioning circuit comprises an operational amplifier chip AD 8676; the differential positive-phase input port is connected with the + INA pin of the operational amplifier chip through a fifth resistor R5, and a second capacitor C2 which is grounded is connected between the fifth resistor R5 and the + INA pin of the operational amplifier chip; the differential negative input port is grounded, and an-INA pin of the operational amplifier chip is grounded through a sixth resistor R6; the VCC-pin of the operational amplifier chip is connected with a power supply of-12V, the OUTA pin of the operational amplifier chip is connected with the + INB pin of the operational amplifier chip through an eighth resistor R8, and the common end of the sixth resistor R6 and the INA pin of the operational amplifier chip is connected between the OUTA pin of the operational amplifier chip and an eighth resistor R8 through a seventh resistor R7; the VCC + pin of the operational amplifier chip is connected with a 12V power supply; a fifth capacitor C5 which is grounded is also connected between the + INB pin of the operational amplifier chip and the eighth resistor R8; the OUTB pin and the-INB pin of the operational amplifier chip are connected to a common point, the common point is connected with the single-ended output port, and the single-ended output port transmits the conditioned analog signal to the atmosphere data computer through the atmosphere machine connector; a third capacitor C3 and a fourth capacitor C4 which are grounded are connected between a VCC-pin of the operational amplifier chip and a power supply of-12V, and the third capacitor C3 and the fourth capacitor C4 are grounded in parallel; a sixth capacitor C6 and a seventh capacitor C7 which are grounded are connected between a VCC + pin of the operational amplifier chip and a 12V power supply; and the sixth capacitor C6 and the seventh capacitor C7 are grounded in parallel.
7. The detection system composed of the atmospheric data computer detection platform according to any one of claims 1 to 6, characterized in that: the device comprises the detection platform, a standard air pressure source and an atmospheric data computer; the output end of the detection platform is connected with a standard air pressure source, and the output end of the standard air pressure source is connected with an atmospheric data computer; the detection platform is also connected with an atmospheric data computer;
the detection platform sends a control instruction to the standard air pressure source, transmits a test instruction and an analog signal to the air data computer, and detects the air data computer according to test data fed back by the air data computer;
the standard air pressure source provides air pressure for the air data computer according to the control instruction of the detection platform;
and the atmospheric data computer obtains a plurality of test data according to the test instruction and the analog signal of the detection platform under the air pressure provided by the standard air pressure source, and feeds the test data back to the detection platform.
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