CN114791349A - Wind tunnel pressure measuring system based on digital pressure measuring module - Google Patents
Wind tunnel pressure measuring system based on digital pressure measuring module Download PDFInfo
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Abstract
The application relates to the technical field of wind tunnel pressure measurement, and discloses a wind tunnel pressure measurement system based on a digital pressure measurement module, which comprises: the system comprises a data acquisition server, an upper computer and a digital pressure measuring module; the data acquisition server is used for sending an instruction to the upper computer and summarizing and storing the pressure measurement data uploaded by the upper computer; the upper computer is used for receiving and feeding back instructions of the data acquisition server, controlling and communicating the plurality of digital pressure measurement modules and uploading pressure measurement data to the data acquisition server; the digital pressure measuring module comprises a plurality of pressure sensors, a signal conditioning channel, an A/D conversion unit and a main control unit; the signal conditioning channel is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor; the A/D conversion unit is used for converting and digitally filtering the signal; the main control unit is used for processing and calibrating the data to obtain the pressure measurement data. Therefore, the cost is low, the networking is easy and quick, and the stability and the reliability of the system are improved.
Description
Technical Field
The invention relates to the technical field of wind tunnel pressure measurement, in particular to a wind tunnel pressure measurement system based on a digital pressure measurement module.
Background
The pneumatic pressure sensor is widely applied to various fields of military and national economy, and relates to a plurality of industries such as aerospace, railways, automobiles, ships, machine tools, pipelines and the like. In the aerospace field, with the continuous promotion of aircraft skill and war index, its aerodynamic appearance is more complicated, structural design margin is littleer, and aerodynamic load distribution has very big influence to aircraft performance, behaviour and stability characteristics and structural strength.
The wind tunnel test is the most main means for predicting the aerodynamic performance of the aircraft and acquiring the key aerodynamic data required by the design of the aircraft. The 3 cores of the wind tunnel measurement and control system are a pressure measuring system, a force measuring system and a control system. The wind tunnel aerodynamic pressure measurement test is an essential part in aircraft development, and data such as model surface pressure distribution, separation characteristics of airflow on a model, lift force acting on the model, differential pressure resistance, pressure center position and the like can be obtained by measuring the model surface pressure distribution, so that the wind tunnel aerodynamic pressure measurement test is a direct basis for optimizing the aerodynamic performance of the aircraft, checking the structural strength and verifying the numerical calculation result.
Although the wind tunnel measurement and control system is continuously developed, a large number of advanced instruments and equipment and leading edge testing technologies are widely applied to wind tunnel tests, the core pressure measurement system completely depends on import, can not well meet some requirements of domestic wind tunnel pressure measurement tests, has the problem of neck of the wind tunnel core measurement and control technology, has the current situation that key technologies are monopolized by foreign countries, and needs to be specially researched.
The current pressure measurement has the characteristics of lacking a measurement mode of a system, specific measurement environment, few channels of single equipment or complex networking, no market-subdivided special equipment, no function rigid of matched software and the like. Along with pressure measurement's needs, what need not only include pressure measurement, still including measurement and control, it is more and more high to pressure measurement automation, intelligent requirement, still need carry out further analysis to pressure data simultaneously, people are used to more conveniently, and powerful pressure measurement system, rather than oneself choose pressure sensor and then build measurement system again, waste time and energy like this, a lot of errors appear very likely in addition. A measurement system integrating measurement, information acquisition, signal processing and communication capabilities is urgently needed in the development of production practice. The wind tunnel pressure measurement system architecture used in China is mainly an IO mode point-to-point system architecture, so that the point-to-point direct connection mode is poor in stability, and once the acquisition server is damaged, the acquisition and calculation results of pressure measurement data are greatly influenced.
Disclosure of Invention
In view of this, the present invention aims to provide a wind tunnel pressure measurement system based on a digital pressure measurement module, which is not only low in cost and easy to rapidly network, but also enhances the anti-interference capability and improves the stability and reliability of the system. The specific scheme is as follows:
a wind tunnel pressure measuring system based on a digital pressure measuring module comprises: the system comprises a data acquisition server, an upper computer and a digital pressure measuring module;
the data acquisition server is used for sending an instruction to the upper computer and summarizing and storing the pressure measurement data uploaded by the upper computer;
the upper computer is used for receiving and feeding back instructions of the data acquisition server, controlling and communicating the digital pressure measuring modules and uploading pressure measuring data sent by the digital pressure measuring modules to the data acquisition server;
the digital pressure measuring module comprises a plurality of pressure sensors, a signal conditioning channel, an A/D conversion unit and a main control unit; wherein,
the pressure sensor is used for acquiring pneumatic pressure information;
the signal conditioning channel is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor and conditioning the processed signal to a level required by the A/D conversion unit;
the A/D conversion unit is used for converting and digitally filtering the received signals and transmitting the obtained data to the main control unit;
and the main control unit is used for processing and calibrating the received data to obtain pressure measurement data and sending the pressure measurement data to the upper computer.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, the data acquisition server is connected to the plurality of upper computers through an ethernet bus.
Preferably, in the wind tunnel pressure measuring system provided by the embodiment of the present invention, the data acquisition server and the upper computer perform data transmission through a TCP and a UDP protocol.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, the upper computer is connected to the plurality of digital pressure measurement modules through an RS485 bus.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, the data transmission is performed between the upper computer and the digital pressure measurement module through a real-time field bus protocol.
Preferably, in the wind tunnel pressure measuring system according to an embodiment of the present invention, each digital pressure measuring module is an 8-channel pressure measuring module.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, each digital pressure measurement module is directly placed inside a model of a wind tunnel test site.
Preferably, in the wind tunnel pressure measuring system provided in the embodiment of the present invention, the data acquisition server is further configured to read networking states between the upper computer and the data acquisition server, between the upper computer and the digital pressure measuring modules, and between the digital pressure measuring modules, and if networking is performed, set all parameters and check whether the system is ready for a test; and if so, sending an instruction to the upper computer.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, when pressure measurement data is uploaded by the upper computer, a check code is added to the tail of the data frame.
Preferably, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, the upper computer calls each of the digital pressure measurement modules in turn to perform communication in a serial communication manner;
the data acquisition server calls the upper computers in turn for communication according to a serial communication mode.
According to the technical scheme, the wind tunnel pressure measuring system based on the digital pressure measuring module provided by the invention comprises: the system comprises a data acquisition server, an upper computer and a digital pressure measuring module; the data acquisition server is used for sending instructions to the upper computer and summarizing and storing the pressure measurement data uploaded by the upper computer; the upper computer is used for receiving and feeding back instructions of the data acquisition server, controlling and communicating the digital pressure measurement modules and uploading pressure measurement data sent by the digital pressure measurement modules to the data acquisition server; the digital pressure measuring module comprises a plurality of pressure sensors, a signal conditioning channel, an A/D conversion unit and a main control unit; the pressure sensor is used for acquiring pneumatic pressure information; the signal conditioning channel is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor and conditioning the processed signal to a level required by the A/D conversion unit; the A/D conversion unit is used for converting and digitally filtering the received signals and transmitting the obtained data to the main control unit; and the main control unit is used for processing and calibrating the received data to obtain pressure measurement data and sending the pressure measurement data to the upper computer.
According to the wind tunnel pressure measuring system provided by the invention, the pressure sensor, the signal conditioning channel, the A/D conversion unit and the main control unit are integrated into a digital pressure module, the module is communicated with the upper computer, and the upper computer is communicated with the data acquisition server.
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In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wind tunnel pressure measurement system according to an embodiment of the present invention;
FIG. 2 is a frame diagram of a wind tunnel pressure measurement system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an RS485 bus topology structure provided by an embodiment of the present invention;
fig. 4 is a flow chart of data acquisition and transmission of the wind tunnel pressure measurement system according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a wind tunnel pressure measuring system based on a digital pressure measuring module, as shown in figure 1, comprising: the digital pressure measuring module 10, the upper computer 20 and the data acquisition server 30;
the data acquisition server 30 is used for sending instructions to the upper computer 20 and summarizing and storing the pressure measurement data uploaded by the upper computer 20;
the upper computer 20 is used for receiving and feeding back instructions of the data acquisition server 30, controlling and communicating the plurality of digital pressure measuring modules 10, and uploading pressure measuring data sent by the digital pressure measuring modules 10 to the data acquisition server 30;
the digital pressure measuring module 10 comprises a plurality of pressure sensors 11, a signal conditioning channel 12, an A/D conversion unit 13 and a main control unit 14; wherein,
the pressure sensor 11 is used for acquiring pneumatic pressure information;
the signal conditioning channel 12 is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor 11, and conditioning the processed signal to a level required by the A/D conversion unit 13;
an a/D conversion unit 13, configured to convert and digitally filter the received signal, and transmit the obtained data to the main control unit 14;
and the main control unit 14 is used for processing and calibrating the received data to obtain pressure measurement data and sending the pressure measurement data to the upper computer 20.
In the wind tunnel pressure measuring system provided by the embodiment of the invention, the pressure sensor, the signal conditioning channel, the A/D conversion unit and the main control unit are integrated into a digital pressure module, the module is communicated with the upper computer, and the upper computer is communicated with the data acquisition server.
It should be noted that, in the wind tunnel pressure measuring system in the prior art, the channel sensor, the multi-way switch and the conditioning bottom plate are designed as a ZOC scanning valve module, while the digital conversion module and the acquisition module are designed as another module, and the ZOC scanning valve module transmits an analog signal to the acquisition module, which is easily subjected to various interferences, and affects the precision and the reliability; the single ZOC scanning valve module has large volume, cannot be further close to a test site, and has larger error due to the adoption of a long air guide pipe; the types and calibration parameters of the ZOC scanning valve are stored in the acquisition module, and the interchangeability process is complex and poor in interchangeability when in use. The pressure measuring module in the wind tunnel pressure measuring system is digitally moved forward, and a conditioning bottom plate in the prior art is replaced by a conditioning channel on the basis of keeping the original pressure sensor, so that the original function of switching multiple channels is realized, and the scanning function is realized; the output signal of the sensor is conditioned, amplified in a program control way and filtered by a signal conditioning channel, the signal is conditioned to the level required by an AD sampling module, and then converted by an A/D conversion unit, and the unit performs digital filtering on the sampling data; and finally, transmitting the sensor data to a main control unit for processing. The main control unit receives the digital quantity after A/D conversion and then performs data processing, data calibration, synchronous response, communication, instrument control and the like. Compared with the original mode of directly connecting the analog differential data line with the host, the expandability of the system is greatly improved.
In specific implementation, in the wind tunnel pressure measurement system provided by the embodiment of the invention, each digital pressure measurement module can be an 8-channel pressure measurement module, that is, each digital pressure measurement module can be provided with an 8-channel sensor, and meanwhile, the digital pressure measurement module is designed in an integrated and miniaturized manner, has a small volume which is only 1/5 of the volume of the ZOC scanning valve module, can be placed in a test site in a preposed manner, and meanwhile, the error caused by long bleed air of an air pipe is reduced. In addition, the invention can adopt 24 bit AD, strengthen the interconnection among the circuits and strengthen the anti-interference capability, thereby leading the key technical index of the digital pressure measuring module to be superior to or not lower than the foreign system index.
The wind tunnel pressure measuring system provided by the invention is mainly used for large-scale starting of the pressure sensor cluster pressure measuring system, can realize pneumatic pressure measurement of more than 2000 points, and meets the requirement of development of special models of wind tunnels.
In specific implementation, in the wind tunnel pressure measurement system provided in the embodiment of the present invention, as shown in fig. 2, the data acquisition server may be connected to a plurality of upper computers through an ethernet bus; and data transmission is carried out between the data acquisition server and the upper computer through a TCP (transmission control protocol) and a UDP (user datagram protocol) protocol. In addition, the upper computer can be connected with a plurality of digital pressure measuring modules through an RS485 bus; and the data transmission is carried out between the upper computer and the digital pressure measuring module through a real-time field bus protocol. The expandability of the bus is utilized, the interchangeability is good when in use, and the hybrid system with different ranges can be formed, and the expandability, the maintenance and the calibration are easy.
Specifically, the wind tunnel pressure measuring system adopts an Ethernet bus and an RS485 bus. Related equipment can be directly hung on the bus, so that the communication connection of all the equipment can be realized only through the communication bus, the workload of field wiring or field work installation can be reduced, and the test efficiency can be improved. Considering the simple implementation of the digital pressure measuring module, the RS485 bus is adopted for the transformation of the scanning valve in the first stage, and the network port is adopted for the transformation of the scanning valve in the second stage and is directly connected with the data acquisition server through the Ethernet. The invention is designed only aiming at the reconstruction and expansion scheme of the first stage, and the reconstruction of the second stage is carried out by selecting according to the actual needs of the test at the later stage.
As shown in fig. 2, the wind tunnel pressure measurement system of the present invention is a double-layer structure, which is composed of a digital pressure measurement module, an upper computer (i.e. a data acquisition upper computer) and a data acquisition server, and the functions of the system are as follows: the digital pressure measuring module can be an 8-channel pressure measuring module, is directly arranged in a model of a wind tunnel test site and is used for collecting pneumatic pressure, and the anti-interference performance and the precision of the module are enhanced through the design of digital forward movement and the like. The data acquisition upper computer receives and feeds back instructions of the data acquisition server, controls and communicates the digital pressure measurement modules, and uploads data to the data acquisition server. The data acquisition server is responsible for scheduling and managing the whole pressure measurement system, controls all subsystems in the system through receiving and sending instructions, and summarizes and stores all pressure measurement data. The data acquisition server is provided with scheduling management software, only the data acquisition upper computer is subjected to configuration of instructions such as acquisition and parameter setting, and after an acquisition button is clicked, the server sends the instructions to the data acquisition upper computer, and acquisition and data transmission are carried out according to an acquisition flow.
The requirement on data synchronism of a wind tunnel pressure test per se is not high, the requirement can be on the millisecond level, and a static acquisition mode is adopted, namely, a model is rotated to a certain angle and starts to acquire after being stabilized, and after the acquisition is finished, the model is rotated to the next angle and starts to acquire after being stabilized again, namely, a step acquisition mode is adopted, so that the data frame loss is allowed, only part of data is required to be sent out at the fastest speed through a UDP protocol, and the frame loss is allowed; however, the TCP protocol must ensure that the transmission path is synchronous, and determine whether the transmission is successful; the RS485 bus aims at extremely complex wind tunnel site environment, high electromagnetic interference and the like, so that the existing pressure measuring systems at home and abroad are improved, and the fusion of double-layer structures is performed according to the requirements of each pressure measuring system.
The first layer of architecture of the wind tunnel pressure measurement system is that a data acquisition server collects, processes and analyzes data information of a plurality of data acquisition upper computers, collects, displays large-scale aerodynamic pressure data and controls the whole network, and is the core of the whole network, wherein the data volume is large, and a bus with high and stable communication network use rate is required, so that an industrial Ethernet bus with the communication rate of 1000Mbps can be selected. The bus has better system expansibility, and bus nodes can be increased or decreased according to different pressure measuring points according to specific requirements of model tests. The data transmission is carried out through the TCP and the UDP, wherein the TCP has higher reliability and can ensure the data transmission, and the UDP has lower delay and is more suitable for real-time control. The TCP protocol has a very high reliability, firstly, the data transmission party can actively obtain the result of success or failure of data transmission, once the data transmission fails due to timeout and other reasons, the TCP connection will be disconnected, meanwhile, since no response signal is received, it can immediately know that the data transmission is not successful, and at this time, the connection can be retried. In addition, if the TCP connection is disconnected, both the server and the receiver can determine the connection interruption in a short time, and thus can rapidly attempt reconnection.
In addition, it should be noted that the second layer of the wind tunnel pressure measurement system is a backbone of the whole network, in which the data acquisition upper computer is mainly used for managing a plurality of pressure measurement modules, and communicates with the upper and data acquisition servers and communicates with the lower and a plurality of pressure measurement modules. The data volume is relatively small, the function is relatively single, and the communication requirement is relatively low; the pressure measuring module is generally placed in a wind tunnel test site, and the site environment is complex and has strong electromagnetic interference; in a large wind tunnel, a wind tunnel test site where a pressure measuring module is located is far away from a measurement and control room where a data acquisition server is located, the transmission distance is about 30 meters generally, an RS485 bus adopts a twisted pair for transmission, differential transmission is carried out, and differential signals A and B are output in two paths. And in addition, the RS485 bus can support 400 nodes at the maximum, so that the bus has strong common-mode interference resistance and multi-station capability, and a typical topology structure is shown in FIG. 3. The wind tunnel pressure measuring system adopts a real-time field bus protocol, not only can the master control equipment uniformly receive time for each equipment, but also comprises a frame triggering mode, a scanning triggering mode and a signal triggering mode, the data receiving and transmitting control adopts a token mechanism of the field bus, the synchronism and the reliability between communication devices in the system can be ensured, and an RS485 bus can be selected.
Fig. 4 shows a data acquisition and transmission process of the wind tunnel pressure measurement system provided by the embodiment of the invention, and the specific flow is as follows: after the data acquisition server issues a test starting instruction, whether all the subsystems are networked or not is read firstly, all parameters are set after confirmation, whether all the subsystems are ready for testing or not is checked, then the data acquisition upper computer is controlled to start acquisition, and all the acquired data are collected and stored in the data acquisition server. And D sends networking state representing the networking state query of the upper computer and the pressure measuring module in the double-layer framework, and U sends networking state representing the networking state query between the data acquisition server and the upper computer.
It should be noted that the existing wind tunnel pressure measurement test is a stepping acquisition mode, allows data frame loss, has low requirement on synchronism, and sacrifices transmission efficiency instead of high-reliability transmission of foreign original equipment, thereby affecting test efficiency, so that a data structure is designed again, and reliability is considered while transmission efficiency is ensured. The design of a data architecture ensures that data can be effectively transmitted, and different data packets are designed according to different characteristics (data volume and efficiency of transmission, data congestion prevention and the like) of an RS485 bus and an Ethernet.
Similarly, the upper layer data structure is designed according to the characteristics of the ethernet and the characteristics of huge data volume, and the principle is that the ethernet constructs data frames. After the ethernet software receives the datagram from the network layer, the following operations need to be completed:
first, the data at the internet layer is broken down into smaller blocks as needed to meet the requirements of the data section of the ethernet frame. The overall size of the Ethernet frame must be between 64-1518 bytes (no preamble included). Some systems support larger frames, up to 9000 bytes. Some systems support larger frames, up to 9000 bytes. The data block is then packed into frames. Each frame contains data and other information that is needed by the ethernet network adapter to process the frame.
In specific implementation, in the wind tunnel pressure measuring system provided by the embodiment of the invention, the upper computer may call each digital pressure measuring module in turn to communicate in a serial communication manner, so that synchronization delay may be reduced, a large number of digital pressure measuring modules may be supported, and it is ensured that data is not covered. Similarly, the data acquisition server can call the upper computers in turn to communicate in a serial communication mode, so that the increase of the overall acquisition delay of the system caused by data collision of a plurality of upper computers can be avoided.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
To sum up, the wind tunnel pressure measuring system based on the digital pressure measuring module provided by the embodiment of the invention comprises: the system comprises a data acquisition server, an upper computer and a digital pressure measuring module; the data acquisition server is used for sending an instruction to the upper computer and summarizing and storing the pressure measurement data uploaded by the upper computer; the upper computer is used for receiving and feeding back instructions of the data acquisition server, controlling and communicating the digital pressure measurement modules and uploading pressure measurement data sent by the digital pressure measurement modules to the data acquisition server; the digital pressure measuring module comprises a plurality of pressure sensors, a signal conditioning channel, an A/D conversion unit and a main control unit; the pressure sensor is used for acquiring pneumatic pressure information; the signal conditioning channel is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor and conditioning the processed signal to a level required by the A/D conversion unit; the A/D conversion unit is used for converting and digitally filtering the received signals and transmitting the obtained data to the main control unit; and the main control unit is used for processing and calibrating the received data to obtain pressure measurement data and sending the pressure measurement data to the upper computer. The wind tunnel pressure measurement system is a fusion system framework, a pressure sensor, a signal conditioning channel, an A/D conversion unit and a main control unit are integrated into a digital pressure module, the module is communicated with an upper computer, the upper computer is communicated with a data acquisition server, so that many-to-one data acquisition can be carried out through the sensor, pressure measurement data are transmitted by digital signals, the cost is low, the wind tunnel pressure measurement system is easy to rapidly network, various interferences are not easy to receive, the anti-interference capability is enhanced, and the stability and the reliability of the system are improved.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The wind tunnel pressure measurement system provided by the invention is described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the system and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A wind tunnel pressure measurement system based on a digital pressure measurement module is characterized by comprising: the system comprises a data acquisition server, an upper computer and a digital pressure measuring module;
the data acquisition server is used for sending an instruction to the upper computer and summarizing and storing the pressure measurement data uploaded by the upper computer;
the upper computer is used for receiving and feeding back instructions of the data acquisition server, controlling and communicating the digital pressure measuring modules and uploading pressure measuring data sent by the digital pressure measuring modules to the data acquisition server;
the digital pressure measuring module comprises a plurality of pressure sensors, a signal conditioning channel, an A/D conversion unit and a main control unit; wherein,
the pressure sensor is used for acquiring pneumatic pressure information;
the signal conditioning channel is used for conditioning, program-controlled amplifying and filtering the output signal of the pressure sensor and conditioning the processed signal to a level required by the A/D conversion unit;
the A/D conversion unit is used for converting and digitally filtering the received signals and transmitting the obtained data to the main control unit;
and the main control unit is used for processing and calibrating the received data to obtain pressure measurement data and sending the pressure measurement data to the upper computer.
2. The wind tunnel pressure measurement system according to claim 1, wherein the data acquisition server is connected to the plurality of upper computers via an ethernet bus.
3. The wind tunnel pressure measurement system according to claim 2, wherein data transmission is performed between the data acquisition server and the upper computer through a TCP and a UDP protocol.
4. The wind tunnel pressure measurement system according to claim 1, wherein the upper computer is connected to the plurality of digital pressure measurement modules through an RS485 bus.
5. The wind tunnel pressure measurement system according to claim 4, wherein the data transmission is performed between the upper computer and the digital pressure measurement module through a real-time field bus protocol.
6. The wind tunnel pressure measurement system according to claim 1, wherein each of said digital pressure measurement modules is an 8-channel pressure measurement module.
7. The wind tunnel pressure measurement system according to claim 1, wherein each of said digital pressure measurement modules is placed directly inside a model of a wind tunnel test site.
8. The wind tunnel pressure measurement system according to claim 1, wherein the data acquisition server is further configured to read networking states between the upper computer and the data acquisition server, between the upper computer and the digital pressure measurement modules, and between the digital pressure measurement modules, and if networking is performed, set all parameters and check whether the system is ready for a test; and if so, sending an instruction to the upper computer.
9. The wind tunnel pressure measurement system according to claim 1, wherein a check code is added to a tail of the data frame when the pressure measurement data is uploaded by the upper computer.
10. The wind tunnel pressure measurement system according to claim 1, wherein the upper computer calls each of the digital pressure measurement modules in turn for communication in a serial communication manner;
the data acquisition server calls each upper computer in turn to communicate according to a serial communication mode.
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| CN202210694617.2A Pending CN114791349A (en) | 2022-06-20 | 2022-06-20 | Wind tunnel pressure measuring system based on digital pressure measuring module |
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