CN113899263B - Shock wave power testing system, method and storable medium - Google Patents
Shock wave power testing system, method and storable medium Download PDFInfo
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- CN113899263B CN113899263B CN202111193875.4A CN202111193875A CN113899263B CN 113899263 B CN113899263 B CN 113899263B CN 202111193875 A CN202111193875 A CN 202111193875A CN 113899263 B CN113899263 B CN 113899263B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B35/00—Testing or checking of ammunition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a shock wave power testing system, a shock wave power testing method and a storable medium, and relates to the field of wireless communication. The invention comprises the following steps: the acquisition and storage module is used for testing the acquisition and storage work of the node explosion shock wave data; the control terminal module is used for monitoring the working state of the acquisition and storage module and completing the working parameter configuration and the test data display work; the transmission module comprises a base station and a receiving and transmitting end antenna, wherein the base station is in wireless connection with the receiving and transmitting end antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module. The invention meets the requirements of remote monitoring and data transmission, effectively improves the working efficiency and has good application prospect.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a shock wave power testing system, a shock wave power testing method and a storable medium.
Background
The 'accurate guidance' and the 'high-efficiency damage' are basic elements of modern weapon equipment, and the explosion shock wave is an important basis for measuring the weapon performance and representing the damage power. With the development of the age, the efficient damage evaluation of weapon ammunition puts higher requirements on the shock wave test technology, and how to efficiently, accurately and safely perform the shock wave test is particularly important. For the explosion shock wave test, a lead wire electrical measurement method and a storage test method are commonly adopted at present. The lead wire electrical measurement method can monitor the field test equipment through the control terminal, but the cable layout work is complex, and the external environment can influence the transmission signal through the long cable. With the rapid development of wireless communication technology, a wireless storage type test system based on ZigBee, WLAN, wiFi technology appears, which brings convenience to field layout and the like, but also exposes the problems of low transmission rate, difficult antenna survival, potential safety hazard of data and the like, and the signal coverage range is not suitable for shock wave overpressure field test in a large area.
Disclosure of Invention
In view of the foregoing, the present invention provides a shock wave power testing system, method, and storable medium.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a shock wave power testing system comprising:
the acquisition and storage module is used for testing the acquisition and storage work of the node explosion shock wave data;
the control terminal module is used for monitoring the working state of the acquisition and storage module and completing the working parameter configuration and the display work of the test node explosion shock wave data;
the transmission module comprises a base station and a receiving and transmitting end antenna, wherein the base station is in wireless connection with the receiving and transmitting end antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module.
Optionally, the control terminal module is composed of an upper computer, and the upper computer selects an IP address to realize wireless communication connection between the control terminal module and the acquisition and storage module.
Optionally, the control terminal module is provided with a wireless transmission process uncertainty model:
the packet loss rate Plr of the shock wave data in the wireless transmission process is used as the packet loss rate of the test system, the bit error rate Ber of the shock wave data in the wireless transmission process is used as the bit error rate of the test system, and the average value of the total packet number of the test data is used as the total packet number n of the transmission data.
Optionally, the collection storage module includes a plurality of test nodes, the test node all is provided with the digital recorder, the mini photoelectric converter of digital recorder embedded assembly, and each test node passes through fiber connection.
Optionally, an antenna element is disposed in the antenna of the transceiver end, and the element is connected to a Tx/Rx pin of the CPE module.
Optionally, the transceiver antenna uses a 635MHz centered frequency band.
Optionally, the directional diagram of the transceiver antenna is "apple-shaped", the out-of-roundness of the directional diagram is 4.5db, and the notch direction of the 3/4 ring is the direction of maximum gain.
A shock wave power testing method comprises the following steps:
the data transmission terminal acquires and collects explosion shock wave data of the test node;
the data transmission terminal transmits the explosion impact data of the test node to the control terminal;
and the data transmission terminal receives the test node explosion impact data processed by the control terminal and transmits the test node explosion impact data to the upper computer.
A computer storage medium having a computer program stored thereon, the computer program being steps which when executed by a processor implement a method of shock wave power testing.
Compared with the prior art, the invention discloses a shock wave power testing system and provides a realization method of an embedded optical fiber synchronous mutual triggering subsystem. And a network performance test and a TNT real explosion test are carried out on the test system, and the obtained shock wave test data has good consistency with a theoretical calculation result. And analyzing through the established uncertainty model to give a quantitative evaluation result of the test system. The test result and the theoretical analysis show that the test system has real and accurate test data, stable and reliable data transmission, meets the requirements of remote monitoring and data transmission, effectively improves the working efficiency and has good application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an embedded synchronous mutual triggering technique according to the present invention;
FIG. 3 is a schematic diagram of the upper computer software of the test system of the present invention;
FIG. 4 is a schematic diagram of the experimental equipment layout of the present invention;
FIG. 5 is a schematic illustration of a test site layout of the present invention;
FIG. 6 is a test system delivery model of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a shock wave power testing system, which comprises:
the acquisition and storage module is used for testing the acquisition and storage work of the node explosion shock wave data;
the control terminal module is used for monitoring the working state of the acquisition and storage module and completing the display work of working parameter configuration and test data;
the transmission module comprises a base station and a receiving and transmitting end antenna, and the base station is in wireless connection with the receiving and transmitting end antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module.
The acquisition and storage module comprises a plurality of test nodes, the test nodes are all provided with digital recorders, the digital recorders are embedded and assembled with mini photoelectric converters, and the test nodes are connected through optical fibers; an antenna element is arranged in an antenna of the receiving and transmitting end, and the element is connected with a Tx/Rx pin of the CPE module; the transmitting and receiving antenna uses 635MHz as the center frequency band. The directional diagram of the receiving and transmitting end antenna is apple-shaped, the out-of-roundness of the directional diagram is 4.5dB, and the notch direction of the 3/4 circular ring is the direction with the maximum gain.
In this embodiment, the 4G wireless communication-based shock wave power testing system is a multi-parameter integrated testing system suitable for large field, long distance and multiple points, and the system principle is shown in fig. 1, and mainly comprises 3 modules of acquisition and storage, 4G transmission and terminal control.
The acquisition and storage module is an array formed by a plurality of digital pressure recorders capable of working independently, and completes the data acquisition and storage work of explosion shock waves; the 4G transmission module mainly comprises a base station and a receiving-transmitting end antenna, and is used for completing transmission work of system state data, control command data and test acquisition data between the test node and an upper computer of the control terminal; the control terminal mainly comprises an upper computer and is used for completing the state monitoring, working parameter configuration and test data display of the test equipment.
The working flow is as follows:
1) Arranging and starting test equipment such as a digital pressure sensor, a 4G communication base station, a control terminal upper computer and the like on an explosion experiment site according to a specific rule;
2) An IP address is selected at the upper computer end to realize 4G wireless communication connection between the control end and the digital pressure recorder, and then system working parameters are configured according to test working conditions;
3) And the digital pressure recorder enters a to-be-triggered state after receiving the to-be-triggered instruction of the upper computer, and circularly stores the acquired data into the SDRAM. When the acquisition pressure of the recorder is larger than the trigger pressure threshold, the system triggers and stores the acquired data and SDRAM data together into a flash, and after the acquisition is finished, the recorder enters a data return waiting timing state and monitors an upper computer instruction;
4) The digital pressure recorder starts to remotely transmit experimental data through 4G wireless communication after reaching data return waiting time or receiving a data return instruction of the upper computer;
and after the digital pressure recorder finishes data feedback, the digital pressure recorder enters the state to be triggered again and continuously monitors the instruction of the upper computer.
2 key technology
2.14G wireless communication system
2.1.1OFDM technique
The OFDM (orthogonal frequency division multiplexing) technology refers to mutual orthogonality among subcarriers, and frequency spectrums can overlap each other after spread spectrum modulation, so that mutual interference among subcarriers is weakened. The technology mainly adopts a wireless transmission mode, utilizes the characteristic of orthogonal frequency division multiplexing, simultaneously adopts the HomePlug technology to divide channels, and each sub-channel after division is respectively transmitted, so that the data transmission rate and the frequency spectrum utilization rate can be integrally improved, and the performance is obvious in the aspects of debilitation resistance and interference resistance [7].
2.1.2MIMO technique
MIMO (multiple input and multiple output) technology refers to reducing the occurrence of channel fading problems by controlling multiple antennas, and efficiently reusing existing multipath propagation and random fading to achieve better transmission speed and efficiency. The multi-parallel antenna space channels can simultaneously transmit and receive, and can meet the requirements of synchronous, high-speed and stable data transmission and remote control of different shock wave overpressure test nodes in a complex environment of a wide-area explosion field.
2.2 Embedded multinode synchronous mutual triggering technique
In a general shock wave power test system, cables or twisted pair wires are used as connecting wires and synchronous trigger wires between different test nodes, which inevitably introduce electromagnetic interference in a complex electromagnetic environment of an explosion field. Especially for the field experiment of large equivalent ammunition, the number of measuring points is large, the testing range is wide, the line layout is complex, the length of the lead is greatly increased, and the serious electromagnetic interference can even submerge the real shock wave signal [9]. The common external optical fiber synchronous triggering device increases the difficulty of equipment layout and has higher requirements on the number of channels. The 4G wireless communication-based shock wave power testing system is provided with mini photoelectric converters in an embedded mode in each testing node digital pressure recorder, and optical fiber connection is used between the testing node digital pressure recorders so as to realize a multi-node synchronous mutual triggering function, and interference of complex electromagnetic environments of an explosion field on shock wave overpressure signals is effectively weakened.
As shown in fig. 2, an embedded multi-node synchronous mutual triggering technology based on photoelectric conversion is illustrated by taking a 6-node shock wave overpressure test recorder array as an example. Wherein 1,2 are different shock wave overpressure test node numbers, with 1-2 representing the fiber optic connection between shock wave overpressure test nodes 1 and 2, and the rest. When the shock wave overpressure test node 3 closest to the explosion source firstly collects the shock wave overpressure signal to trigger, the node 3 transmits trigger signals to the node 2 and the node 6 through the embedded mini-type photoelectric converter. The synchronization trigger signal is transmitted from the node 2 to the node 1 and the node 5, and simultaneously transmitted from the node 6 to the node 5, and obviously, the node 5 receives the two synchronization trigger signals from the node 2 and the node 6 respectively. Likewise, node 4 will receive twice the synchronization trigger signals from node 1 and node 5, respectively. To avoid repeated reception by the same node
The trigger signal affects the data acquisition effort and each node in each experiment only reacts to the first received synchronized trigger signal. The optical fibers 2-5 in the figure are superfluous, so that the problem that the shock wave overpressure test node cannot be triggered synchronously due to the blocking of individual optical fiber lines is effectively avoided, and the synchronous triggering fault tolerance of the whole digital pressure recorder array is improved.
Test verification
In order to verify the working performance of the test system, a network performance test and a TNT charge solid explosion test are developed.
Network performance test
The network performance test is to remotely control and test the digital pressure recorder by a control terminal upper computer through a professional network debugging software tool so as to simulate the data transmission and receiving work between the control terminal and the test site test node. And researching the influence of parameters such as the type of the base station antenna, the height of the base station antenna, the transmission distance of the base station and the recorder, the type of the recorder antenna and the like on the data transmission rate and the reliability of the shock wave overpressure test system based on 4G wireless communication.
The network performance test procedure mainly follows the following steps:
(1) arranging the 4G communication base station and the digital pressure recorder according to a certain interval, respectively connecting the 4G communication base station and the digital pressure recorder with a computer through Ethernet wires, and arranging experimental equipment as shown in figure 5;
(2) selecting an IP address from an upper computer of a control terminal to realize 4G wireless communication connection between the upper computer and a digital pressure recorder, and adjusting the azimuth angle of an antenna to ensure that the signal strength is optimal;
(3) testing ping operation delay, performing packet filling test by using a gperf tool, and recording the maximum packet filling rate;
(4) file transfer testing using a FileZilla tool while rate testing using base station MCSim-6614-B and DUMeter software;
(5) the packet is grabbed using a specialized tool Wireshark for bit error rate analysis.
In a network test of a 4G wireless communication-based shock wave power test system, 2 types of directional antennas and omnidirectional antennas are arranged on a base station antenna; the height of the base station antenna has 2 working conditions (relative to the height of the upper surface of the digital pressure recorder) of 3m and 8 m; the digital pressure recorder is provided with a large antenna and a small antenna (for simulating actual measurement requirements in a real explosion environment, the recorder is arranged in an embedded manner on the ground surface, so that the upper surface of the recorder is flush with the ground surface); the horizontal distance between the base station antenna and the recorder adopts 2 layout states of 500m and 1000 m; in summary, the present test has 2^4 =16 working conditions, and the related test results are shown in table 1.
Table 1 network performance test results
Comprehensively analyzing the test results, the following conclusion can be drawn:
(1) under the same condition, the networked shock wave overpressure test system based on 4G wireless transmission respectively compares tests 1 and 5,2 and 6,3 and 7,9 and 13, 10 and 14, and 12 and 16, and the base station directional antenna performance is better than that of an omnidirectional antenna; comparing tests 1 and 9,2 and 10,3 and 11,5 and 13,6 and 14,7 and 15,8 and 16 respectively, it is known that the 8 meter hanging height of the base station antenna is better than the 3 meter hanging height; comparing experiments 1 and 3,5 and 7,6 and 8, and 9, 10 and 12, 13 and 15, 14 and 16, respectively, it is known that the base station-recorder distance 500 meters is better than 1000 meters; comparing experiments 1 and 2,5 and 6,7 and 8,9 and 10, 13 and 14, 15 and 16, respectively, it is known that the large antenna performance of the terminal is better than the small antenna.
(2) Comparing experiments 11 and 12 show that when other recorders with the same conditions adopt a small antenna and a large antenna, the FTP uplink speed is 5.43M/s and 4.47M/s respectively, the FTP downlink speed is 4.69M/s and 2.45M/s respectively, the maximum uplink speed of the package is 6.99M/s and 5.28M/s respectively, and the condition that the performance of the small antenna of the terminal is better than that of the large antenna is generated;
comparing experiments 11 and 15 shows that when other base stations with the same conditions adopt an omni-directional antenna and a directional antenna, the FTP uplink rates are respectively 5.43M/s and 4.87M/s, the maximum uplink rates of the packet filling are respectively 6.99M/s and 4.26M/s, and the situation that the performance of the omni-directional antenna is better than that of the directional antenna occurs;
it was found through analysis that this is due to the manual adjustment of the omni-directional antenna pitch angle when performing the 11 th set of experiments, whereby it was seen that the omni-directional antenna pitch angle with respect to the recorder had a significant impact on the performance of the 4G wireless communication based shockwave overpressure test system.
(3) In the design of 16 working conditions in the experiment, the optimal configuration is experiment 14, a directional antenna is selected as a base station, the base station antenna is 8 meters high, the distance between a terminal and a recorder is 500 meters, and a large antenna is selected as a recorder; the RSRP value received by the recorder under the working condition is-80 dBm, the ping delay is 40ms, the FTP uplink speed is 20.30M/s, the FTP downlink speed is 15.67M/s, and the maximum uplink speed of the package is 20.46M/s.
Under extreme conditions, as shown in test 3, when the base station adopts an omni-directional antenna, the hanging height of the base station antenna is 3 meters, the distance between the base station and the recorder is 1000 meters, and the recorder selects a small antenna, the recorder receives an RSRP value of-104 dBm; the ping delay is 69ms; the FTP uplink speed is 1.31M/s, the FTP downlink speed is 1.9M/s, the maximum packet uplink speed is 1.52/s, and the wireless transmission speed and the transmission reliability are good.
(4) As the 4G wireless communication contains an HARQ (hybrid automatic repeat request) mechanism, the mechanism combines forward error correction coding (FEC) and automatic repeat request (ARQ), thereby effectively ensuring the accuracy of file transmission, and the error rate of a high layer is 0.00 percent through test verification, and no error phenomenon occurs.
TNT charge solid explosion test
Theoretical calculation formula of overpressure peak value of shock wave
The propagation rule of the near-earth explosion shock wave is very complex, the propagation rule of the shock wave is basically consistent with the propagation rule of infinite air explosion in the initial stage of explosion, when the air shock wave reaches the ground, the air shock wave can be reflected, and different reflection types are formed due to different human firing angles, namely regular reflection, regular reflection and Mach reflection [10].
An infinite aerial explosion refers to an aerial explosion of an explosive without a boundary (or what may be considered to be a borderless). It is generally believed that the contrast height of the charge
The shock wave is not affected by the spatial interface when the following conditions are met:
wherein: h is the height (blast height) (m) of the explosive from the ground; omega is TNT loading (kg).
Explosive with TNT equivalent of omega explodes on the soil surface, and when the distance from the explosion center to the test node is r, the theoretical calculation formula of the incident pressure of air shock wave [11] Is that
Delta inP + For the overpressure value of the shock wave,
in m/kg 1/3 。/>
When the charge near-ground explosion cannot be regarded as infinite air explosion, the shock wave contacts with the ground and is reflected, and if the incidence angle of the shock wave is smaller than the Mach reflection critical angle, regular reflection or normal oblique reflection occurs; mach reflection occurs when the angle of incidence of the shock wave is greater than the critical angle for Mach reflection. Mach-reflective critical angle is related to charge height and charge quantity [12] Mach reflection critical angle
By charging at a higher level than>
Can be expressed as:
when regular reflection or normal oblique reflection occurs, wall reflection overpressure is calculated by formula (4), and when mach reflection occurs, wall reflection overpressure is calculated by formula (5):
in p 0 Is the local atmospheric pressure.
Test site arrangement
To evaluate the consistency of the test data and the reliability of the transmission of the test system, a shock wave test was performed on a static blast test of 5.2kg TNT charges. TNT used in the test consisted of 90% TNT+10% wax with a density of 1.53g/cm 3 The grain diameter was 130mm and the grain height was 260mm. Grain mass center distanceThe ground is 1.5m, 12 measuring points are arranged in two paths, the horizontal distance between each measuring point and the explosion center is 4m, the distance between each measuring point and the explosion center is 14m at the most, one measuring point is additionally arranged every 2 meters, and the specific test site is shown in fig. 5. The node 1 and the node 7 closest to the explosion center are connected by adopting cables, and the rest nodes are all connected by adopting optical fibers.
Shock wave test results of static explosion test
The 4G wireless communication-based shock wave power testing system can effectively capture and record the overpressure time-course curve of the air shock wave, and has good consistency for shock wave waveforms obtained by the first test and the second test for measuring points at different positions in different directions.
The shock wave pressure data recorded by the near-earth explosion shock wave power test system based on 4G wireless communication is listed in table 2. And 4, each test node acquires corresponding data, and other waveforms are normal except obvious overshoots and burrs exist in waveforms obtained by the test nodes 1 and 7 closest to the explosion center. Comparative analysis shows that compared with the traditional cable synchronous triggering technology, the embedded optical fiber synchronous mutual triggering technology can effectively avoid electromagnetic interference in a complex electromagnetic environment of an explosion field and completely record effective information of shock waves. The peak effective shockwave overpressure is reported in table 2.
Table 2 actual measured waveform overpressure peak value and theoretical calculation data table
Comparing the theoretical calculation overpressure peak value with the actual measurement overpressure peak value in table 2, controlling the relative error delta between the theoretical calculation overpressure peak value and the actual measurement overpressure peak value within 13%, and the good coincidence shows that the shock wave power test system based on 4G wireless communication is true and reliable in the near-earth explosion shock wave power test.
Uncertainty analysis
In the field of test metrology, uncertainty exists as part of the measurement results to characterize the dispersion of measured test values. Different from dynamic measurement error, the measurement uncertainty is centered on the measured estimated value, reflects the estimation of people to the measured true value in a certain magnitude range, and can quantitatively evaluate the uncertainty calculation method and model
Class A and class B uncertainty calculation method
(1) Class A uncertainty assessment method
Under the same condition, n times of independent repeated observation are carried out on the measured X to obtain an observed value X i (i=1, 2,3, … … n). Will be arithmetically averaged
As an estimated value of the measured X, a standard uncertainty u is calculated based on bezier's formula x As shown in formula (6):
wherein n is the number of experiments.
Class B uncertainty evaluation method
The class B uncertainty is obtained by researching probability distribution possibly obeyed by measurement according to the prior observation data, technical data or calibration certificate. There are typically 3 cases:
a) Knowing the measured possible distribution interval x-a, x+a and the probability distribution measured in this interval, i.e. the measured confidence interval a and the inclusion factor k, the uncertainty of the measured value x is:
b) Knowing the measured spread uncertainty u (x i ) And factor k, then the uncertainty of measurement x is:
c) Knowing the measured spread uncertainty u p And a confidence level p, determining the inclusion factor k according to the possibly obeyed distribution, and the uncertainty of the measured value x is:
test system uncertainty transfer model
The signal is transmitted in the various modules of the test system, from the input to the output, the transfer function of which can be expressed as F (F 1 ,f 2 ,f 3 ,……f n )，f i Is a transmission unit in the system.
Let the test system input signal be x 0 (t) describing the ideal output y of the signal by transfer function 0 (t) is:
y 0 (t)＝x 0 (t)·F(f i ),(i＝1,2,……n) (10)
as shown in fig. 6, it is assumed that n is used for signal interference error applied to the input terminal of the test system x (t) the signal disturbance error applied to the output is represented by n y (t) the signal interference error of the test system itself is represented by e f And (t) describing the actual output of the system signal by using the transfer function as follows:
y(t)＝(x 0 (t)+n x (t))F(f i )+n y (t)+e f (t) (11)
the systematic dynamic error described by the transfer function is then:
e(t)＝y(t)-y 0 (t)＝n x (t)F(f i )+n y (t)+e f (t) (12)
uncertainty analysis is performed on the transfer model based on the angle of the error source, assuming n x (t) the uncertainty component introduced is u x The uncertainty component introduced by the characteristics of the test system is u F ，n y (t) the uncertainty component introduced is u y For the followingSeries system, system synthesis uncertainty u expressed in transfer function system ：
For parallel systems, the system synthesis uncertainty u expressed in transfer function sys t em The method comprises the following steps:
test system uncertainty calculation model
Uncertainty of the shock wave overpressure testing system mainly comprises uncertainty u introduced by a digital pressure recorder DPR Uncertainty u introduced in data during 4G wireless transmission 4G In two aspects.
The digital pressure recorder used in the system is standardized equipment independently developed by Beijing university of the science and technology, and the uncertainty u DPR 3.98%. Uncertainty introduced in the 4G wireless transmission process of data refers to uncertainty introduced by packet loss and error codes, and the packet loss rate and the error rate of the data are also important indexes for evaluating the wireless transmission performance of the data. The packet loss rate Plr of the shock wave data in the wireless transmission process is used as the packet loss rate of a test system, the bit error rate Ber of the shock wave data in the wireless transmission process is used as the bit error rate of the test system, the average value of the total packet number of the test data is used as the total packet number n of the transmission data, and a calculation formula of uncertainty in the wireless data transmission process can be obtained [14] ：
The error rate is known to be 0.0% in the network test experiment of the test system; in the process of grabbing the packet, 7649 packets are arranged in every 1 group of data, and 1 packet is lost in every 6 groups of data, so that the packet loss rate is 2.18 multiplied by 10 < -3 >. The uncertainty of the wireless data transmission process is obtained according to the following steps:
test system synthesis standard uncertainty
The uncertainty introduced by the digital pressure recorder and the uncertainty introduced by the data during 4G wireless transmission can be logically considered in parallel for the whole test system, and the uncertainty u of the test system is calculated according to formula (14) system The method comprises the following steps:
the overall uncertainty of the test system was 4.02%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A shock wave power testing system, comprising:
the acquisition and storage module is used for testing the acquisition and storage work of the node explosion shock wave data;
the control terminal module is used for monitoring the working state of the acquisition and storage module and completing the working parameter configuration and the display work of the test node explosion shock wave data;
the transmission module comprises a base station and a receiving and transmitting end antenna, wherein the base station is in wireless connection with the receiving and transmitting end antenna and is used for completing data transmission between the acquisition and storage module and the control terminal module;
the control terminal module is provided with a wireless transmission process uncertainty model:
the method comprises the steps of taking a packet loss rate Plr of shock wave data in a wireless transmission process as a packet loss rate of a test system, taking an error rate Ber of the shock wave data in the wireless transmission process as an error rate of the test system, and taking an average value of total packet numbers of the test data as a total packet number n of transmission data;
the acquisition and storage module is an array formed by a plurality of independently-operable digital recorders, and completes the data acquisition and storage work of explosion shock waves; the test system comprises a plurality of test nodes, wherein the test nodes are all provided with digital recorders, the digital recorders are embedded and assembled with mini photoelectric converters, and the test nodes are connected through optical fibers; an antenna element is arranged in the receiving and transmitting end antenna, and the element is connected with a Tx/Rx pin of the CPE module; the receiving and transmitting end antenna uses 635MHz frequency band as the center; the directional diagram of the receiving and transmitting end antenna is apple-shaped, the out-of-roundness of the directional diagram is 4.5dB, and the notch direction of the 3/4 circular ring is the direction with the maximum gain.
2. The shock wave power testing system according to claim 1, wherein the control terminal module is composed of an upper computer, and the upper computer selects an IP address to realize 4G wireless communication connection between the control terminal module and the acquisition and storage module.
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