CN115372688A - Method for accurately measuring object separation time sequence - Google Patents
Method for accurately measuring object separation time sequence Download PDFInfo
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- CN115372688A CN115372688A CN202211004294.6A CN202211004294A CN115372688A CN 115372688 A CN115372688 A CN 115372688A CN 202211004294 A CN202211004294 A CN 202211004294A CN 115372688 A CN115372688 A CN 115372688A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/14—Multichannel or multilink protocols
Abstract
The invention belongs to the technical field of aerospace and discloses a method for accurately measuring an object separation time sequence. The method for accurately measuring the object separation time sequence comprises the steps of determining the number of separation time sequence measurement channels, determining a channel measurement operation mode, determining the time recording precision of the measurement channels, designing a data acquisition coding mode, performing a separation test and recording test data. The method for accurately measuring the object separation time sequence uses the interruption information of optical signals or electric signals to represent the separation characteristics of objects, and measures the interruption time of signals in each channel transmission line by arranging multi-channel signal transmission lines on monitoring nodes at the object separation positions to obtain the high-precision time sequence information of object separation. The method for accurately measuring the object separation time sequence is used for performing high-precision time sequence measurement on the object separation process in the events of explosion, impact and high-speed flight, and is particularly suitable for occasions with short separation process, high time sequence measurement precision and measurement data needing remote measurement and wireless transmission.
Description
Technical Field
The invention belongs to the technical field of aerospace, and particularly relates to a method for accurately measuring an object separation time sequence.
Background
In the technical field of aerospace, a plurality of events such as object control separation often exist, and in the separation events, separation time sequence information among objects is accurately measured, so that the method has important value for accurately controlling parameters such as the attitude, the orbit and the like of an aircraft.
In such object separation events, whether explosive separation, mechanical separation, or thermal fusion separation, it is difficult to achieve the desired separation process, i.e., the desired separation distance or separation speed cannot be maintained throughout the process from the start of separation to the end of separation. Therefore, the separation time sequence data of the nodes required to be monitored in the separation process is accurately acquired by measuring the separation process of the related objects, and the method has important significance for evaluating the separation effect and improving the control precision of the motion parameters of the flight target.
At present, the method for measuring the separation condition between objects is mainly an optical imaging method, the method can intuitively obtain image data in the separation process, but the method is difficult to obtain effective measurement data in the occasions that the object separation speed is high, data needs to be transmitted in a wireless mode, or light interference exists in the separation process. If the object separation speed is high and the data transmission needs to be performed in a telemetering wireless mode, in order to obtain a clear image in the separation process, the frame frequency of optical imaging needs to be increased, but the frame frequency is difficult to be increased without limit, and in addition, the increase of the imaging frame frequency can generate a large amount of data exceeding the limit of the wireless transmission code rate capability of telemetering data, for example, when the object separation speed is 100m/S, in order to obtain a clear separation process image, the optical imaging adopts 1000 frames/S of frame frequency, each clear image is estimated to be 1Mb, and the 1000Mb data volume generated per second far exceeds the capability of the prior common telemetering wireless data transmission code rate (for example, the S band is about 20Mbps at most).
Aiming at the measurement requirements of the separation problems, the invention provides a method for accurately measuring the separation time sequence of an object by using a high-transient identification processing mode of a multi-channel interrupt signal.
Disclosure of Invention
The invention aims to provide a method for accurately measuring the separation time sequence of an object.
The method for accurately measuring the object separation time sequence comprises the following steps:
s10, determining the number of separated time sequence measurement channels;
determining monitoring nodes needing measuring time sequence in the separation process of an object to be measured according to application requirements, arranging a measuring channel at each monitoring node, and determining the number of all channels needed by separation time sequence measurement, namely the number M of measuring channels;
s20, defining a channel measurement operation mode;
according to the characteristics of the separation environment of the object to be measured or the measurement requirements, determining the interruption mode of the measurement signal of each channel;
s30, determining the time recording precision of the measurement channel;
according to the measurement requirements, the time measurement precision of the object separation time sequence is determined, and further the time recording precision of each channel is determined;
s40, designing a data acquisition coding mode;
designing an acquisition coding mode of measurement channel interrupt data according to the number M of measurement channels, a measurement operation mode and the time recording precision Delta T of the measurement channels, and specifically comprising the following steps:
s41, identifying the change condition of the electric signals corresponding to each channel, and determining the interruption time of the electric signals corresponding to each channel;
s42, coding and recording the signal interruption time of each channel and the corresponding channel number;
the code length L1 of the interrupt time is determined by the recording precision Delta T and the timing length T of the measurement channel time, and L1= int [ log ] 2 (T/ΔT)]+1, the coding length L2 of the channel number is determined by the number of measurement channels M, L2= int [ log [ ] 2 M]+1；
S50, carrying out a separation test and recording test data.
Further, the measurement signal interruption mode of step S20 includes an optical signal measurement operation mode transmitted by an optical fiber or an electrical signal measurement operation mode transmitted by a metal wire; selecting an optical signal measurement operation mode of optical fiber transmission within the range of-40-150 ℃, converting an optical signal into an electrical signal through a photoelectric conversion circuit, and judging whether the measurement signal is interrupted or not; at the temperature of more than 150 ℃, a metal wire with a melting point higher than the ambient temperature and excellent electric conduction property is selected as an electric signal transmission measurement mode.
The method for accurately measuring the object separation time sequence uses the interruption information of optical signals or electric signals to represent the separation characteristics of objects, and measures the interruption time of signals in each channel transmission line by arranging a multi-channel signal transmission line on a monitoring node at the object separation position, thereby obtaining the object separation time sequence data with less data volume and nanosecond measurement precision.
The method for accurately measuring the object separation time sequence is mainly used for performing high-precision time sequence measurement on the object separation process in the events of explosion, impact, high-speed flight and the like, and is particularly suitable for occasions where the separation process is short (such as millisecond level, microsecond level and the like), the time sequence measurement precision is required to be high (such as microsecond level and even nanosecond level), and the measurement data needs telemetering and wireless transmission.
Drawings
FIG. 1 is a flow chart of a method of accurately measuring object separation timing of the present invention;
FIG. 2 is a schematic view showing the case and the body of embodiment 1 separated;
fig. 3 is a schematic structural diagram of a wire and a single-channel micro pin of a monitoring node in embodiment 1.
In the figure, 1. A housing; 2. a body; 3. monitoring the nodes;
301. single pin insertion; 302. hole site; 303. a wire.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. To make the design method of the present invention clearer, an embodiment of the present invention is proposed herein, and the described embodiment is a part of the embodiment of the present invention, not a whole embodiment. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, taking a case and body separation event of a certain target in a flight process as an example, the method for accurately measuring an object separation time sequence of the present invention is used to realize high-precision measurement of the time sequence of the separation process, and specifically, the following steps are performed:
s10, determining the number of channels for measuring the separation time sequence
As shown in fig. 2, the housing 1 is sleeved on the body 2, 200 monitoring nodes 3 are arranged along a parting line, each monitoring node 3 is connected with one measuring channel, 200 measuring channels are connected in total, and the number of measuring channels M =200.
S20, defining a channel measurement operation mode
As the casing 1 is sleeved with the body 2 and needs to bear the high temperature of 200 ℃ in the separation process, considering that the separation process of the casing 1 and the body 2 is influenced as little as possible by the operation mode of the measuring channel, the operation mode of measuring the electric signal by adopting the metal wire transmission is selected.
As shown in fig. 3, each monitoring node 3 is configured as a wire plus single channel micro pin configuration. Corresponding hole sites 302 are arranged on two sides of the separation line, a metal wire 303 is fixed on each hole site 302, the two metal wires 303 are connected through a single pin 301, and when the monitoring node 3 is separated, the single pin 301 is separated, so that electric signals transmitted by a measurement channel of the monitoring node 3 are interrupted.
S30, determining the time recording precision of the measuring channel
The duration of the process of separating the casing 1 from the main body 2 is estimated to be about 1Ms, that is, the recording time is about 1Ms, the time measurement accuracy Δ T of the separation timing sequence is required to be 100Ms, and the channel measurement time recording accuracy is also 100Ms.
S40, designing a data acquisition coding mode
The number of the measuring channels of the separation event is 200, an electric signal measuring operation mode transmitted by a metal wire is adopted, the time recording precision of the measuring channels is 100Ms, the electric signals of the 200 measuring channels are monitored in real time by utilizing a high-speed digital signal processing mode (such as DSP, FPGA and the like), once the electric signal interruption is found (such as the situation that 5V is changed into 0V), the time of the electric signal interruption is recorded by utilizing 14 bits, and the channel number of the corresponding electric signal interruption is recorded by utilizing 8 bits.
S50, carrying out a separation test and recording test data
Finally, the recording time of the present separation event is about 1.6ms, and the amount of generated data is less than 1Mb.
Claims (2)
1. A method for accurately measuring the timing of the separation of an object, comprising the steps of:
s10, determining the number of the separation time sequence measurement channels;
determining monitoring nodes needing measuring time sequence in the separation process of an object to be measured according to application requirements, arranging a measuring channel at each monitoring node, and determining the number of all channels needed by separation time sequence measurement, namely the number M of measuring channels;
s20, defining a channel measurement operation mode;
according to the characteristics of the separation environment of the object to be measured or the measurement requirements, determining the interruption mode of the measurement signal of each channel;
s30, determining the time recording precision of the measurement channel;
according to the measurement requirement, the time measurement precision of the object separation time sequence is determined, and further the measurement time recording precision of each channel is determined;
s40, designing a data acquisition coding mode;
designing an acquisition coding mode of measurement channel interrupt data according to the number M of measurement channels, a measurement operation mode and the time recording precision Delta T of the measurement channels, and specifically comprising the following steps:
s41, identifying the change condition of the electric signals corresponding to each channel, and determining the interruption time of the electric signals corresponding to each channel;
s42, coding and recording the signal interruption time of each channel and the corresponding channel number;
the code length L1 of the interrupt time is determined by the recording precision Delta T and the timing length T of the measurement channel time, and L1= int [ log ] 2 (T/ΔT)]+1, the coding length L2 of the channel number is determined by the number of measurement channels M, L2= int [ log [ ] 2 M]+1；
S50, carrying out a separation test and recording test data.
2. The method for accurately measuring the separation timing of an object according to claim 1, wherein the interruption mode of the measurement signal of step S20 comprises an optical signal measurement mode of optical fiber transmission or an electrical signal measurement mode of wire transmission; selecting an optical signal measurement operation mode of optical fiber transmission within the range of-40-150 ℃, converting an optical signal into an electrical signal through a photoelectric conversion circuit, and judging whether the measurement signal is interrupted or not; at the temperature of more than 150 ℃, a metal wire with a melting point higher than the ambient temperature and excellent electric conduction property is selected as an electric signal transmission measurement mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211004294.6A CN115372688A (en) | 2022-08-22 | 2022-08-22 | Method for accurately measuring object separation time sequence |
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| CN202211004294.6A CN115372688A (en) | 2022-08-22 | 2022-08-22 | Method for accurately measuring object separation time sequence |
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| CN202211004294.6A Pending CN115372688A (en) | 2022-08-22 | 2022-08-22 | Method for accurately measuring object separation time sequence |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372651A (en) * | 2022-08-22 | 2022-11-22 | 中国空气动力研究与发展中心超高速空气动力研究所 | Method for measuring object separation speed in signal interruption mode |
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2022
- 2022-08-22 CN CN202211004294.6A patent/CN115372688A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372651A (en) * | 2022-08-22 | 2022-11-22 | 中国空气动力研究与发展中心超高速空气动力研究所 | Method for measuring object separation speed in signal interruption mode |
| CN115372651B (en) * | 2022-08-22 | 2024-03-29 | 中国空气动力研究与发展中心超高速空气动力研究所 | Method for measuring object separation speed in signal interruption mode |
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