CN112284712A

CN112284712A - Experimental collection system that measures of structure separation

Info

Publication number: CN112284712A
Application number: CN202011223764.9A
Authority: CN
Inventors: 吴龙飞; 肖传清; 潘浚铭; 涂俊; 吴远峰
Original assignee: Shanghai Space Precision Machinery Research Institute
Current assignee: Shanghai Space Precision Machinery Research Institute
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-01-29
Anticipated expiration: 2040-11-05
Also published as: CN112284712B

Abstract

The invention provides a structure separation test measurement acquisition device which comprises an upper computer, a conversion box, a separation starting trigger signal cable and a plurality of acquisition units, wherein the upper computer is in communication connection with the conversion box; each acquisition unit is communicated with the upper computer after being connected with a corresponding interface on the conversion box; the conversion box is connected with the separation execution console through a separation starting triggering signal cable. The application scenario is mainly that separation starting trigger signals are collected before and after structural member separation in a structure separation test, time points of the separation starting trigger signals are recorded, and inertia parameters such as angles, angular velocities, angular accelerations, displacement accelerations and the like of a separated structure are measured and recorded in the structural member separation process. The structure separation test measurement and acquisition device can be used in application scenes such as structure separation tests and the like, and fills the gap that the related high-performance structure separation test measurement and acquisition device is lacked in China.

Description

Experimental collection system that measures of structure separation

Technical Field

The invention relates to the field of communication, in particular to a structure separation test measurement acquisition device.

Background

The structure separation test is an important test which needs to be implemented in many complex structure design and development projects, and is mainly used for checking whether the separation force borne by a separated structure is sufficient, whether the kinetic energy of the separated structure meets the design expectation, the inertial motion of the structure after separation, the posture of a free falling body and the like. In many cases, the structure separation test needs to measure parameters such as separation time, separation speed, angular speed and acceleration of a separated piece in the separation and falling process, so as to determine whether the separation force of the structure is sufficient and the separation resistance is proper, and judge various information related to the separation process, such as the distance of falling or ejection after separation, and the like according to the measured inertial parameters. Currently, speed or angular velocity is mostly measured by optical measurement, and the principle of the method is mainly to record the separation process by fast shooting and measure the inertia parameters in the separation process by recording and replaying. However, the optical measurement is affected by lens imaging errors, timing device accuracy, observation and measurement angles, and the like, and the overall measurement accuracy is not high. Especially when the measured structure is large and needs to be shot at a long distance, the precision is reduced more obviously. And the measured value is more complicated to calculate and has low efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a structure separation test measurement acquisition device.

The invention provides a structure separation test measurement acquisition device, which comprises an upper computer, a conversion box, a separation starting trigger signal cable and a plurality of acquisition units, wherein:

the upper computer is in communication connection with the conversion box;

each acquisition unit is communicated with the upper computer after being connected with a corresponding interface on the conversion box;

the conversion box is connected with the separation execution console through a separation starting triggering signal cable.

Preferably, a plurality of acquisition units are fixed in the different positions required by the separated structure.

Preferably, the collecting unit comprises a shell, a collecting power circuit board, a power supply and storage capacitor and a communication interface,

wherein:

the acquisition power supply circuit board, the power supply and energy storage capacitor and the communication interface are arranged in the inner shell;

the power supply and energy storage capacitor supplies power to the acquisition power supply circuit board;

the communication interface is connected with the processor on the acquisition power supply circuit board through a signal wire and is connected with the power supply through a power wire

An electrical energy storage capacitor.

Preferably, the converter box circuit board comprises a differential conversion chip, the differential conversion chip converts the differential remote separation start trigger signal into a TTL level for the processor to collect, and the converted TTL level trigger signal is connected to the interrupt input core pin of the processor chip.

Preferably, the acquisition unit comprises embedded measurement control software and an MEMS inertial measurement chip, and is used for measuring angles, angular velocities, angular accelerations and displacement accelerations.

Preferably, a direct current stabilized voltage power supply is installed inside the conversion box and supplies power to the conversion box through a cable connected with the acquisition unit.

Preferably, the capacitance of the supply energy storage capacitor is greater than 1 farad.

Preferably, the acquisition unit comprises a memory, and the capacity of the memory is greater than or equal to 32 MB.

Preferably, the processor chip has a dominant frequency of 50MHz or higher.

Preferably, the host computer includes control software and communication card, and control software control conversion box and acquisition element, communication card include a plurality of communication channel.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention collects the separation starting trigger signal and records the time point of the separation starting trigger signal when the structure is separated, and provides a high-efficiency and high-precision measurement and collection device for the structure separation test;

2. the invention adopts the high-precision MEMS inertia measurement chip to directly measure the angle, the angular velocity, the angular acceleration, the displacement velocity, the position acceleration and other parameters of the separated structure in the separation process, and reads the measurement data from the MEMS inertia measurement chip through the embedded processor, thereby improving the measurement precision and the test efficiency;

3. the value measured by the acquisition unit is stored in the internal memory chip, and the data is stored in the upper computer after reaching the upper computer through the conversion box, so that the data loss caused by the falling and damage of the acquisition unit in the separation process can be avoided.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic diagram of the overall composition of a separation test measurement acquisition device;

fig. 2 is a schematic view of the internal structure of the separation test measurement acquisition device.

The figures show that:

upper computer 1

Acquisition unit 2

Change-over box 3

Separate start trigger signal cable 4

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1 and fig. 2, according to the structural separation test measurement acquisition device provided by the present invention, the separation start trigger time point acquisition is to receive the separation start trigger signal through the I/O core pin of the embedded processor, and at the same time, the processor reads the internal clock value and records it in the memory, so as to determine the time point of the separation start trigger and store and record it; the inertial parameter measurement and recording is to measure the inertial parameters of the part before and after separation through MEMS chips in the acquisition units arranged at different positions of the separated structure, and record the corresponding clock value when the measured value is obtained through an embedded processor; the data measured by the acquisition unit in the test can be stored in a memory inside the acquisition unit, and simultaneously transmitted to an upper computer for display and storage through remote communication. Specifically, the structure separation test measurement acquisition device comprises an upper computer, an acquisition unit, a conversion box and a separation starting trigger signal cable. The number of the acquisition units can be configured and arranged at different parts of the separated piece according to actual test requirements, and the number of the acquisition units used in the scene of the schematic diagram of the embodiment is 3. When an operator controls the acquisition unit in a test, the upper computer software controls the relevant channel on the communication card to transmit a control signal to the interface connected with the conversion box, and the control signal passes through the conversion box and then reaches the required acquisition unit through the cable. When data are collected in a test, the data signals are transmitted to corresponding interfaces on the conversion box through cables after inertial parameters such as angles, angular velocities, angular accelerations, displacement accelerations and the like are measured in real time by the collecting units, and then the data signals reach an upper computer through the interfaces of the conversion box and the cables.

The upper computer is provided with test control software and a communication card, and is mainly used for setting and controlling parameters of the remote acquisition unit, displaying and recording status signals and measured value signals from the acquisition unit through the conversion box on a local hard disk, and displaying stored historical data.

The collecting units are fixedly arranged at the required positions of the separated test piece, the number of the collecting units in the test is determined according to the test requirement, and the collecting units are arranged at most 10 in the embodiment and are arranged at different required positions of the test piece. The acquisition unit is mainly responsible for recording inertial parameters such as angle, angular velocity, angular acceleration, displacement acceleration and the like in the separation process according to instructions of an upper computer, and the inertial parameters of the acquisition unit are equal to the inertial parameters of the corresponding part of the separated piece due to the fact that the acquisition unit is installed and fastened on the separated structure. In addition, the acquisition unit is also responsible for acquiring the remote separation starting trigger signal transmitted after the differential conversion of the conversion box, and recording the time at that time as the remote separation starting trigger time. The acquired data is recorded in a memory inside the acquisition unit, and the data is transmitted to the conversion box through an interface of the acquisition unit while being stored and finally reaches the upper computer.

Furthermore, the acquisition unit comprises an MEMS inertial measurement chip, an embedded processor chip, a memory, an SDRAM chip, a power supply and energy storage capacitor, a communication interface and a shell. The energy storage capacitor is arranged on the circuit board inside the collecting unit and used for avoiding the power failure of the collecting unit caused by unstable power supply of a power line due to vibration and pulling in the separation process. The work of the acquisition unit is mainly controlled by the embedded processor chip running the embedded measurement control software. During test, the acquisition unit processor waits for an instruction of an upper computer, and when the instruction of the upper computer reaches the acquisition unit communication interface through the communication card, the cable, the conversion box and the cable, the interface converts the instruction into a TTL level and sends the TTL level to the embedded processor chip. After the processor confirms the 'start' instruction, an MEMS inertia measurement chip on a circuit board of the acquisition unit is opened, the chip measures inertia parameters such as angle, angular velocity, angular acceleration, displacement acceleration and the like, and sends the measured original data to an embedded processor chip, the embedded processor chip converts the data and marks the time at that time, and then stores the inertia parameters and the time data in a memory on the circuit board and sends serial data signals outwards. At the moment of executing the separation starting, the corresponding trigger signal passes through the separation execution console, the separation starting trigger signal cable, the conversion box (converted into a differential signal) and the cable to reach the communication port of the acquisition unit, the communication port converts the signal into a TTL level and then reaches the interrupt input core pin of the embedded processor and triggers an interrupt response program, the interrupt response program records the current time as a separation execution time point, and then the time point data signal is sent to the upper computer. Furthermore, the power supply and energy storage capacitor is connected with a power line of the acquisition unit and is connected with a power supply port of the circuit board of the acquisition unit in parallel. The capacitor is charged to a constant voltage in a state where the pickup unit is powered by the switching box through the cable. If the cable cannot supply power due to pulling, vibration and extrusion in an accident process, the capacitor is connected with a power supply port of the acquisition unit circuit board, so that power supply to the acquisition unit circuit board is started.

The conversion box is characterized in that 1 TTL-differential conversion chip is arranged in the conversion box and converts remote separation starting trigger signals in the form of switching values or voltage values from a separation starting trigger signal cable into differential signals, and the differential signals are divided into parallel signals in the conversion box and then are transmitted to interfaces on the conversion box and then reach corresponding acquisition units through cables. Furthermore, the conversion box is also responsible for supplying power to each acquisition unit through a cable between the conversion box and the acquisition unit. And a direct-current stabilized voltage power supply is arranged in the conversion box, and supplies power to the acquisition unit through 2 power lines in a cable connected with the acquisition unit. Furthermore, the interfaces on the converter box are also responsible for implementing the two-wire communication channel switching between each acquisition unit and the upper computer (in this example, the number of the interfaces is 10, as shown in fig. 1), so that the interfaces for connecting each acquisition unit include 6 pins, namely a two-wire trigger signal pin, a two-wire upper computer-acquisition unit signal pin, and a two-wire power supply pin.

Furthermore, the energy storage capacitor for power supply adopts a capacitor with the capacitance of more than 1 Farad, the capacity of the memory is not less than 32MB, and the main frequency of the embedded processor chip is not less than 50 MHz.

The separation starting triggering signal cable mainly comprises a 2-core lead and is connected with the conversion box and the separation starting execution operating platform.

The invention provides a high-efficiency and high-precision measurement and acquisition device for a structure separation test, which adopts a high-precision MEMS inertial measurement chip to directly measure the angle, the angular velocity, the angular acceleration, the displacement velocity, the position acceleration and other parameters of a separated structure in the separation process, and reads measurement data from the MEMS inertial measurement chip through an embedded processor, thereby improving the measurement precision and the test efficiency.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The utility model provides a structure separation test measurement collection system which characterized in that, includes host computer, conversion box, separation start trigger signal cable and a plurality of acquisition unit, wherein:

the upper computer is in communication connection with the conversion box;

2. A structural separation test measurement acquisition device according to claim 1, wherein a plurality of acquisition units are fixed at different positions required by the separated structure.

3. The structural separation test measurement acquisition device of claim 1, wherein the acquisition unit comprises a housing, an acquisition power supply circuit board, a power supply and storage capacitor, and a communication interface, wherein:

the communication interface is connected with the processor on the acquisition power supply circuit board through a signal wire and is connected with the power supply and energy storage capacitor through a power wire.

4. The structural separation test measurement and collection device of claim 3, wherein the converter box circuit board comprises a differential conversion chip, the differential conversion chip converts the differential remote separation start trigger signal into TTL level for collection by the processor, and the converted TTL level trigger signal is connected to the interrupt input pin of the processor chip.

5. The structural separation test measurement acquisition device according to claim 1, wherein the acquisition unit comprises embedded measurement control software and an MEMS inertial measurement chip, and measures angles, angular velocities, angular accelerations and displacement accelerations.

6. The structural separation test measurement acquisition device according to claim 1, wherein a DC stabilized power supply is installed inside the conversion box, and the DC stabilized power supply supplies power to the conversion box through a cable connected with the acquisition unit.

7. The structural separation test measurement collection device of claim 3, wherein the power supply and storage capacitor has a capacitance greater than 1 farad.

8. The structural separation test measurement acquisition device according to claim 1, wherein the acquisition unit comprises a memory having a capacity of 32MB or more.

9. The structural separation test measurement and acquisition device of claim 3, wherein the processor chip has a dominant frequency of 50MHz or higher.

10. The structural separation test measurement and collection device of claim 1, wherein the upper computer comprises control software and a communication card, the control software controls the conversion box and the collection unit, and the communication card comprises a plurality of communication channels.