CN110956797A

CN110956797A - Portable pulse sending and data acquisition test system

Info

Publication number: CN110956797A
Application number: CN201911195991.2A
Authority: CN
Inventors: 周文怡; 蔡睿; 朱子环; 公绪滨; 敖春芳; 刘岳鹏; 杨国
Original assignee: Beijing Institute of Aerospace Testing Technology
Current assignee: Beijing Institute of Aerospace Testing Technology
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-04-03

Abstract

The invention aims to overcome the defect that the traditional test system is not portable, and provides a pulse transmitting and data acquiring test system with higher portability, universality and automation degree. The test system mainly comprises a compact RIO system, a portable explosion-proof signal transfer box and pulse sending and data acquisition test software.

Description

Portable pulse sending and data acquisition test system

Technical Field

The invention relates to the field of pulse transmission, data acquisition and computer software, and aims to solve the problems of pulse transmission and data acquisition under the condition of high-frequency test site replacement.

Background

At present, most of test systems are based on GPIB, VXI, PXI, LXI and other standard test buses, but the test systems have the defects of large size, weight and power consumption, and the portability of the system needs to be improved urgently. The traditional test mode obviously cannot meet the portable requirement of replacing the test site at high frequency.

Disclosure of Invention

The invention aims to overcome the defect that the test system is not portable, and provides a pulse transmitting and data acquiring test system with higher portability, universality and automation degree.

In order to achieve the above object, the portable pulse transmission and data acquisition test system of the present invention comprises:

the test system mainly comprises a compact RIO system, a portable explosion-proof signal transfer box and pulse sending and data acquisition test software.

The compact RIO system is a reconfigurable embedded measurement and control platform produced by the national instruments of America, has extremely firm hardware architecture, is provided with a reconfigurable Field Programmable Gate Array (FPGA) case and a real-time controller, can conveniently integrate various functional modules, and constructs a portable test system with small volume, light weight, high precision, flexible configuration and powerful functions.

The function of the portable explosion-proof signal transfer box mainly comprises four aspects: firstly, a CompactRIO system is embedded into the compact rio system; secondly, an interface for signal circulation is provided, and various relay modules are arranged; thirdly, isolating, amplifying, distributing and necessary preprocessing the signal to be detected, and providing the signal to be detected to a compact RIO system to be a clean, stable and safe signal to be detected; fourthly, an aviation plug convenient to plug and unplug is integrated.

The pulse sending and data acquisition testing software consists of human-computer interface software, RT software and FPGA software. The man-machine interface software runs in a Windows system, the host resources are most flexible, the debugging is convenient, the single real-time performance is poor, and the method is suitable for data display, storage and network service provision. The RT software has the advantages of flexible resource, convenient debugging and good real-time property, and is suitable for functions of operation measurement, local signal analysis, fault diagnosis, complex control logic and the like. FPGA software is directly executed through bottom layer logic, so that the real-time performance is best, but the resource is limited, the debugging is relatively difficult, and the method is suitable for realizing signals and processing with simple user-defined I/O and large repeatability and control logic with high certainty.

Drawings

FIG. 1 is a block diagram of the system architecture of the present invention.

Fig. 2 is a physical diagram of the portable explosion-proof adapter box of the invention.

Fig. 3 is a software configuration diagram of the present invention.

Detailed Description

Further description is provided below in connection with the accompanying drawings, with reference to a portable pulse transmission and data acquisition test system herein.

As shown in figure 1, the system of the invention comprises a compactRIO system, a portable explosion-proof signal transfer box and pulse sending and data acquisition test software.

The compactRIO system adopts the modularized design concept, has the expandable capability and mainly consists of a compactRIO real-time controller, a compactRIO I/O module, a reconfigurable case and a power supply module. CompactRIO embedded systems are small in size, are compatible with temperatures ranging from-40C to 70℃, resist 50g of impact, and are compatible with hazardous or potentially explosive environments. The characteristics effectively ensure the portability and the reliability of the system and can quickly carry out tests in different areas.

CompactRIO real-time controller: and selecting an embedded multi-slot controller case all-in-one machine suitable for high-level control and monitoring application, and operating an NI Linux Real-Time operating system. The Xilinx Kintex-7325T FPGA chip is provided with a 1.91GHz four-core processor, a 2GBDRAM memory and 16G storage capacity. The controller is mainly communicated with the host through a TCP/IP protocol, so that the control program and the FPGA VI are compiled or downloaded and run in a real-time system.

CompactRIO I/O Module: and selecting a C series analog input module and a digital output module. The multi-channel high-performance current input module has double isolation shielding from a channel to the ground/a grounding end, and achieves good safety and noise immunity. Each channel of the multi-channel source-level output module is compatible with 5-30V signals, supports industrial logic levels and signals, can be directly connected to various industrial switches, sensors and equipment, has transient overvoltage protection between the output channel and the ground/grounding end, and indicates the state through an LED.

Reconfigurable chassis: the cores of the CompactRIO embedded system include RIO FPGA cores. FPGAs can implement control logic, input/output, timing, triggering, and synchronization designs through custom hardware. The RIO FPGA chip is connected with the I/O module in a star topology mode, and each module can be directly accessed to carry out accurate control. The robust metal structure of the reconfigurable chassis encloses the entire CompactRIO platform.

A power supply module: power is supplied to the whole CompactRIO system.

As shown in fig. 2, the portable explosion-proof signal transfer box of the invention is provided with a signal circulation interface in a real object and is integrated with an aviation plug convenient for plugging and unplugging.

As shown in fig. 3, the pulse transmission and data acquisition test software of the present invention is divided into three parts, which are respectively fpga.vi, rt.vi, and host.vi (i.e., human-computer interaction program).

The FPGA-vi program is developed in an FPGA unit and mainly realizes a data acquisition function and pulse instruction sending; an RT.vi program is developed in an RT controller and mainly realizes instruction transmission and data transmission with the FPGA.vi and the HOST.vi; the host. vi program is developed in a notebook computer and mainly realizes man-machine interaction functions, such as displaying data, sending commands, managing data and the like.

The FPGA.vi comprises two parts of contents: and the digital quantity output module sends a pulse signal and the analog quantity input module acquires a signal. And the channels of the high-speed digital I/O module respectively output pulse sequences, so that the valve is switched on and off. In order to improve the execution efficiency of the program, a plurality of independent while loops are established. And carrying out data acquisition of the high-speed analog quantity acquisition module in another while loop.

Developing an RT main program by using a LabVIEW RT module, generating an executable file, deploying the executable file into a real-time controller, reading the numerical value of a display control or data in a DMAFIFO buffer area, slightly processing the numerical value or the data, and sending the processed numerical value or the data to an upper computer by using an Ethernet bus to realize data acquisition and processing and communication with the upper computer. The RT main program needs to drive a core compactRIO controller of the whole measurement and control system, and meanwhile communication with two parts of host.vi and FPGA.vi of an upper computer is guaranteed, and instruction and data transmission is completed. The task amount is large, so the RT main program is divided into three modules of network communication, pulse instruction sending and data acquisition according to functions by adopting a modular programming idea.

The network communication module completes communication between the upper computer and the lower computer. The development of the network communication module also adopts a state machine framework, and an upper computer sends an instruction through the network communication module to acquire data; and simultaneously, the lower computer sends the data to the upper computer through the network communication. The communication mode adopted in the method is TCP/IP, and events in the state machine mainly comprise initialization, interception, data receiving, data sending and the like.

The development of the pulse instruction module adopts a state machine framework comprising a plurality of events, and mainly comprises events such as pulse setting, pulse sending and pulse stopping.

The development of the data acquisition module adopts a state machine framework comprising a plurality of events, and mainly comprises the events of initialization, data reading and the like. In an initialization event, the configuration of the FPGA is mainly completed, the FPGA is called, and a collection command of an upper computer is waited to be received. And a data reading event, which mainly finishes running the FPGA, reads the data once every 100ms, sends the data to the network communication module through the queue after the reading is finished, continuously circulates until a stop command arrives, closes the FPGA reference, and finishes the program execution.

The main functions of the human-computer interface software include:

(1) an operator can conveniently edit the pulses of the plurality of digital output channels, and can save the pulse sequence as a document for the next use;

(2) after the pulse is edited, the pulse can be sent/stopped, namely, the valve is switched according to a set program;

(3) an operator can conveniently configure the acquisition channel and can store the configuration as a document so as to be convenient for the next use;

(3) real-time display (curve, etc.) of test data, storage and post-processing and analysis functions of test data;

(4) related condition parameters can be manually input, the acquisition is automatically carried out under the condition that the conditions are met, and the data acquisition is stopped under the condition that the conditions are not met any more;

(5) the system protection function is provided, the measured value of the key point can be judged, obvious prompt is provided when the measured value exceeds the normal range, and system protection such as stopping test, system power off and the like is executed by software when necessary;

(6) the method can operate the interface visually and conveniently, and has obvious prompt for key steps in the test flow.

The human-computer interface software mainly adopts while circulation as the integral framework, and controls the whole system by calling an event structure, and the main framework of the software is an 'event structure', namely, when a corresponding button on the front panel is pressed/lifted, the corresponding event is responded. The menu bar can be used for carrying out operations of pulse editing, pulse sending, sending stopping, channel configuration, data acquisition, acquisition stopping, data storage, storage stopping, data review, condition data acquisition, condition acquisition stopping and system exiting.

Claims

1. A portable pulse sending and data acquisition testing system is characterized by mainly comprising a compact RIO system (1), a portable explosion-proof signal transfer box (2) and pulse sending and data acquisition testing software (3).

The CompactRIO system (1) comprises a CompactRIO real-time controller (4), a CompactRIO I/O module (5), a reconfigurable chassis (6), and a power supply module (7).

The portable explosion-proof signal transfer box (2) embeds the compactRIO system (1) therein and provides the compactRIO system (1) with a clean, stable and safe signal to be measured.

The pulse sending and data acquisition testing software (3) consists of human-computer interface software (8), RT software (9) and FPGA software (10).

The human-computer interface software (8) can carry out operations of 'pulse editing', 'pulse sending', 'sending stopping', 'channel configuration', 'data acquisition', 'acquisition stopping', 'data storage', 'storage stopping', 'data review', 'condition data acquisition', 'condition acquisition stopping', 'system quitting'.