CN114001892A - Time synchronization method between free jet test measurement systems - Google Patents
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention relates to a time synchronization method between free jet test measurement systems, belongs to the field of aircraft vibration measurement, and solves the problems of complex system and high cost caused by the fact that each measurement system receives system instructions when the time synchronization between the measurement systems in the prior art is required. The method comprises the following steps: arranging a plurality of vibration sensors and a plurality of noise sensors in the test piece, each vibration sensor being connected to a vibration measurement system, each noise sensor being connected to a noise measurement system, any one of said measurement systems being connected to the test stand controller; carrying out free jet test on a test piece, sending a timing command by a controller, receiving the command by a measurement system connected with the controller and determining a timing zero point according to the command; acquiring a vibration measurement curve and a noise measurement curve of each measurement system; determining the time corresponding to the first peak value of the test recovery stage in each curve; and carrying out time synchronization on the measurement system according to the first peak value moment of the test recovery stage of each measurement curve.
Description
Technical Field
The invention belongs to the field of aircraft vibration measurement, and particularly relates to a time synchronization method between free jet test measurement systems.
Background
Because the free jet test can simulate the state of the engine in a real flight environment on the ground, the flight power device, the air inlet channel and the like can be tested by adopting the high-altitude simulation free jet test of the engine.
In the free jet test, vibration and noise environments are generally measured, the vibration and noise environments need to be measured at a high sampling rate, the measurement data volume is large, a plurality of measurement systems are often adopted, the measurement data is generally shown in fig. 1 and 2, and in order to facilitate analysis, the data measured by each measurement system needs to be analyzed by using a uniform time coordinate. Generally, each measurement system is used to collect a unified timing system command to establish a timing relationship between the measurement systems, which requires an additional device, and the system is relatively complex, and increases the test cost. In some tests, due to the reasons that measurement resources are limited, or a time system instruction cannot be output to a plurality of measurement systems, and the like, the time system instruction cannot be acquired in each measurement system, so that the time system relationship is difficult to establish among the plurality of measurement systems.
Disclosure of Invention
In view of the foregoing analysis, an embodiment of the present invention is directed to provide a time synchronization method between free jet test measurement systems, so as to solve the problems of complicated apparatus and high test cost caused by the requirement that each measurement system acquires a time system instruction in the existing time synchronization method.
On one hand, the embodiment of the invention provides a time synchronization method between free jet test measurement systems, which comprises the following steps:
arranging a plurality of vibration sensors and a plurality of noise sensors in the test piece, each vibration sensor being connected to one vibration measurement system, each noise sensor being connected to one noise measurement system, any one of the plurality of vibration measurement systems and the plurality of noise measurement systems being connected to the test stand controller;
carrying out free jet test on a test piece, sending a timing command by a controller, receiving the command by the measuring system connected with the controller and determining a timing zero point according to the command;
acquiring a vibration measurement curve of each vibration measurement system and a noise measurement curve of each noise measurement system;
determining the time corresponding to the first peak value of the test recovery stage in each vibration measurement curve and each noise measurement curve;
and carrying out time synchronization on the measurement system according to the time corresponding to the first peak value in the test recovery stage of each measurement curve.
Further, the time synchronization of the measurement system according to the first peak time of the test recovery phase of each measurement curve includes:
and finding out the time corresponding to the first peak value of the test recovery stage corresponding to the measuring system connected with the controller, recording the time as tx, recording the time corresponding to the first peak value of other measuring systems as t1, t2 and … … tn, and taking tx-t1, tx-t2, … … and tx-tn as the time adjustment quantity of the corresponding measuring systems, and carrying out time synchronization among the measuring systems according to the time adjustment quantity.
Further, the performing time synchronization between measurement systems according to the time adjustment amount includes: and adding the corresponding measuring system and the time adjustment quantity on the basis of the original time coordinate to obtain time after time synchronization.
Further, the free jet test comprises three stages, which are sequentially in time order: a preparation phase, an effective phase and a recovery phase.
Further, the acquiring a vibration measurement curve of each vibration measurement system and a noise measurement curve of each noise measurement system includes:
in the test process, a vibration measuring system and a noise measuring system collect vibration signals and noise signals measured by a vibration sensor and a noise sensor in real time;
and filtering and normalizing the vibration signal and the noise signal to obtain a vibration measurement curve and a noise measurement curve.
Further, in the test process, the vibration measurement system and the noise measurement system collect vibration signals and noise signals measured by the vibration sensor and the noise sensor in real time, and the collection is stopped after at least 10s of collection in the test recovery stage, so that the first vibration peak value and the first noise peak value in the test recovery stage are ensured to be collected.
Further, when the test reaches the effective stage, the test bed controller sends out a timing system command and keeps the timing system command until the test is cancelled when the effective stage is ended.
Further, the above-mentioned measuring system connected to the controller receiving the command and determining the system zero point according to the command includes: and the measuring system connected with the controller receives the time system command and sets the time of the measuring system corresponding to the voltage rising edge of the received time system command as a time system zero point.
Furthermore, the noise sensor and the vibration sensor are arranged in the same closed space in the test piece, the vibration sensor is arranged on a mounting bracket of each part in the closed space of the test piece and used for measuring X, Y, Z vibration data in three directions, and the noise sensor is arranged on the inner wall of the closed space and at a position away from the inner wall by a certain distance and used for measuring a noise signal in the closed space of the test piece.
Furthermore, the range of the vibration sensor is 0.3Hz-4000 Hz; the measuring range of the noise sensor is 130dB-160dB, and the frequency range is 0.3Hz-4000 Hz.
Compared with the prior art, the invention can at least realize the following beneficial effects:
for noise measurement and vibration measurement in a free jet test, the time-system relation among measurement systems can be determined by identifying noise and vibration peak values after the test is finished without respectively acquiring time-system instructions by each measurement system, and the problem of time-system determination of vibration and noise data acquisition by a plurality of measurement systems is solved. The result can be popularized to vibration and noise measurement of free jet tests of various aircrafts. By adopting the method, not only can the time-system relationship among multiple measurement systems be determined, but also the complexity of the measurement systems is reduced, and the test cost is reduced.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a noise measurement curve;
FIG. 2 is a schematic view of a vibration measurement curve;
FIG. 3 is a schematic flow chart illustrating a method for time synchronization between measurement systems according to the present application;
FIG. 4 is a block diagram of the free test measurement system of the present application;
FIG. 5 is a schematic diagram of a noise measurement curve of the noise measurement system 1 of the present application;
FIG. 6 is a schematic diagram of a noise measurement curve of the noise measurement system 2 of the present application;
FIG. 7 is a schematic diagram of a vibration measurement curve of the vibration measurement system 1 of the present application;
FIG. 8 is a schematic diagram of a vibration measurement curve of the vibration measurement system 2 of the present application;
FIG. 9 is a schematic diagram of a noise measurement curve obtained after the noise measurement system 2 of the present application;
FIG. 10 is a schematic diagram of a systematic vibration measurement curve of the vibration measurement system 1 of the present application;
FIG. 11 is a schematic diagram of a systematic vibration measurement curve of the vibration measurement system 2 of the present application;
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
One embodiment of the present invention discloses a time synchronization method between free jet test measurement systems, as shown in fig. 3, the method includes the following steps:
s1, arranging a plurality of vibration sensors and a plurality of noise sensors in the test piece, wherein each vibration sensor is connected to a vibration measuring system, each noise sensor is connected to a noise measuring system, and any one system selected from the plurality of vibration measuring systems and the plurality of noise measuring systems is connected with the test bed controller;
s2, carrying out free jet test on the test piece, sending a timing command by the controller, receiving the command by the measuring system connected with the controller, and determining a timing zero point according to the command;
s3, obtaining vibration measurement curves of the vibration measurement systems and noise measurement curves of the noise measurement systems;
s4, determining the corresponding time of the first peak value of the test recovery stage in each vibration measurement curve and each noise measurement curve;
and S5, performing time synchronization on the measuring system according to the time corresponding to the first peak value of the test recovery stage of each measuring curve.
Compared with the prior art, the time synchronization method between the free jet test measurement systems provided by this embodiment performs time synchronization between the measurement systems by obtaining the vibration measurement curves and the noise measurement curves of the multiple measurement systems and determining the moments corresponding to the first vibration peak value and the noise peak value in the test recovery stage in each vibration measurement curve and noise measurement curve.
In practice, the adopted test measurement system is shown in fig. 4, and the test measurement system mainly comprises: the device comprises a free jet test bed, a test piece, a test bed controller, a vibration measurement system, a noise measurement system, a vibration sensor and a noise sensor. The test piece is placed on the free jet test bed, and the vibration sensor and the noise sensor are installed in the test piece and used for measuring vibration data and noise data of the test piece in the test process.
The following steps are specifically described:
step S1, arranging a plurality of vibration sensors and a plurality of noise sensors in the test piece, wherein each vibration sensor is connected to a vibration measuring system, each noise sensor is connected to a noise measuring system, and any one system selected from the plurality of vibration measuring systems and the plurality of noise measuring systems is connected with the test bed controller;
when the vibration measuring system is implemented, two vibration sensors and two noise sensors are arranged, and two vibration measuring systems and two noise measuring systems are correspondingly arranged; the number of the vibration sensors and the noise sensors can be set according to actual needs.
Specifically, the test piece is usually an aircraft, the aircraft comprises a plurality of cabin sections, each cabin section is a closed space, and vibration and noise environments in each space are different, so when vibration and noise data are collected, vibration and noise data in the same closed space are collected, so when a sensor is installed, the noise sensor and the vibration sensor are installed in the same closed space in the test piece, the vibration sensor is installed on an installation support of each component in the closed space of the test piece and used for measuring X, Y, Z vibration data in three directions, and the noise sensor is installed on the inner wall of the closed space of the test piece and at a position spaced from the inner wall by a certain distance and generally is more than 5cm away from the wall surface.
By adopting the installation mode, the acquired vibration data and the acquired noise data can be sourced from the same closed space, so that the subsequent analysis can be conveniently carried out aiming at different closed space environments.
After the vibration sensors and the noise sensors are installed, each vibration sensor is connected to a vibration measuring system, and each noise sensor is connected to a noise measuring system.
And one system selected from all the vibration measurement systems and the noise measurement systems is connected with the test bed controller and used for receiving a time system command sent by the controller. In practice, the noise measurement system 1 is selected to be connected to the test stand controller as shown in fig. 4. Of course, other measurement systems may be selected to be connected to the test stand controller, and the effect is the same.
In the application, only one measuring system is required to be connected with the controller to receive the time system instruction, and all measuring systems are not required to receive the time system instruction, so that an additional device is not required to be added, and the system is simple and easy to implement.
Specifically, according to the actual test environment, the range of the selected vibration sensor is +/-500 g, and the frequency range is 0.3Hz-4000 Hz; the range of the noise sensor is 130dB-160dB, and the frequency range is 0.3Hz-4000 Hz.
When the devices in the system are connected during the test, step S2 may be performed;
step S2, carrying out free jet test on the test piece, sending a timing command by the controller, receiving the command by the measuring system connected with the controller and determining a timing zero point according to the command;
specifically, the test process comprises three stages, which are sequentially according to the time sequence: a preparation phase, an effective phase and a recovery phase.
When the test reaches the effective stage, the test bed controller sends out a timing system instruction and keeps the timing system instruction until the test is cancelled when the effective stage is finished. Specifically, the timing system command is a voltage signal, the voltage jumps from 0 to 28V when the timing system command is sent out, the timing system command is maintained, and the voltage jumps from 28V to 0V when the timing system command is cancelled.
And the noise measurement system connected with the controller receives the time system command and determines a time system zero point according to the command.
Specifically, the noise measurement system connected to the controller receives the time system command, and sets the time of the noise measurement system corresponding to the time system command voltage rising edge as a time system zero point.
Step S3, obtaining vibration measurement curves of all vibration measurement systems and noise measurement curves of all noise measurement systems;
specifically, the sampling frequency of the vibration measurement channel in each vibration measurement system is set to be 5120Hz, low-pass filtering is adopted, the filtering frequency is 2000Hz, the sampling frequency of the noise channel in each noise measurement system is 30KHz, low-pass filtering is adopted, and the filtering frequency is 10 KHz.
The vibration measurement system and the noise measurement system collect vibration signals and noise signals of the vibration sensor and the noise sensor in real time in the test process, data collection is continuously carried out from a test preparation stage to a test recovery stage, and collection is stopped after at least 10s of collection in the test recovery stage, so that the first vibration peak value and the first noise peak value in the test recovery stage are ensured to be collected.
After the vibration signal and the noise signal are collected, the vibration measurement system and the noise measurement system respectively perform filtering and normalization processing on the vibration signal and the noise signal to obtain a vibration measurement curve and a noise measurement curve, as shown in fig. 5-8, fig. 5-8 show the noise measurement system 1 and 2, and the noise measurement curve and the vibration measurement curve obtained by the vibration measurement system 1 and 2.
S4, determining the corresponding time of the first peak value of the test recovery stage in each vibration measurement curve and each noise measurement curve;
as shown in fig. 5 to 8, for the noise measurement curve obtained by the noise measurement system 1, the first noise peak value in the test recovery phase is 0.4223, and the corresponding time is 30.12 s; for the noise measurement system 2, the first noise peak value in the test recovery stage is 1, and the corresponding time is 24.37; for the vibration measurement system 1, the first vibration peak value in the test recovery stage is-1, and the corresponding time is 1.649, and for the vibration measurement system 2, the first vibration peak value in the test recovery stage is-1, and the corresponding time is 10.97;
it can be seen that the time in each measurement curve is not uniform, and when the data are subsequently used for operation, the time of the data needs to be uniform, so that the time of each measurement system needs to be synchronized.
And S5, carrying out time synchronization on the measuring system according to the first peak time of the test recovery stage of each measuring curve.
After a plurality of free jet tests are carried out, the inventor finds out through analysis of test data that the physical process of the free jet test bed in the initial stage of the recovery stage causes strong noise and strong vibration in a short time, so that each measurement system can be timed by utilizing the characteristic.
Specifically, the first peak time of the test recovery phase corresponding to the measurement system connected with the controller is found and recorded as tx, the first peak times of other measurement systems are recorded as t1, t2 and … … tn, tx-t1, tx-t2, … … and tx-tn are used as time adjustment quantities of the corresponding measurement systems, and time synchronization among the measurement systems is carried out according to the time adjustment quantities.
Specifically, the time synchronization between the measurement systems is performed as follows: and adding the corresponding measuring system and the time adjustment quantity on the basis of the original time coordinate to obtain time after time synchronization.
In a specific real-time example, a measurement system connected with a controller is found to be a noise measurement system 1, the time tx corresponding to the first noise peak in the test recovery stage in a noise measurement curve obtained by the system is 30.12s, the time instants of the first noise peaks in the test recovery stages corresponding to the noise measurement system 2, the vibration measurement system 1 and the vibration measurement system 2 are respectively 24.37s, 1.649s and 10.97s, and then (30.12-24.37) s, (30.12-1.649) s and (30.12-10.97) s are used as time adjustment quantities of the noise measurement system 2, the vibration measurement system 1 and the vibration measurement system 2.
The noise measurement system 2, the vibration measurement system 1, and the vibration measurement system 2 are added to the time adjustment amount on the basis of the original time coordinate as the time after the time system, as shown in fig. 9 to 11. After the noise measurement system 2, the vibration measurement system 1 and the vibration measurement system 2 are time-synchronized, the time of the obtained vibration measurement curve and the time of the obtained noise measurement curve are synchronized with the time of the noise measurement curve obtained by the noise measurement system 1, so that subsequent data analysis and processing are facilitated.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A time synchronization method between free jet test measurement systems is characterized in that: the method comprises the following steps:
arranging a plurality of vibration sensors and a plurality of noise sensors in the test piece, each vibration sensor being connected to one vibration measurement system, each noise sensor being connected to one noise measurement system, any one of the plurality of vibration measurement systems and the plurality of noise measurement systems being connected to the test stand controller;
carrying out free jet test on a test piece, sending a timing command by a controller, receiving the command by the measuring system connected with the controller and determining a timing zero point according to the command;
acquiring a vibration measurement curve of each vibration measurement system and a noise measurement curve of each noise measurement system;
determining the time corresponding to the first peak value of the test recovery stage in each vibration measurement curve and each noise measurement curve;
and carrying out time synchronization on the measurement system according to the time corresponding to the first peak value in the test recovery stage of each measurement curve.
2. The method of claim 1, wherein the time synchronizing the measurement system according to the first peak time of the test recovery phase of each measurement curve comprises:
and finding out the time corresponding to the first peak value of the test recovery stage corresponding to the measuring system connected with the controller, recording the time as tx, recording the time corresponding to the first peak value of other measuring systems as t1, t2 and … … tn, and taking tx-t1, tx-t2, … … and tx-tn as the time adjustment quantity of the corresponding measuring systems, and carrying out time synchronization among the measuring systems according to the time adjustment quantity.
3. The method of claim 1, wherein the time synchronization between the measurement systems according to the time adjustment comprises: and adding the corresponding measuring system and the time adjustment quantity on the basis of the original time coordinate to obtain time after time synchronization.
4. The method for time synchronization according to claim 1, characterized in that the free jet test comprises three phases, in chronological order: a preparation phase, an effective phase and a recovery phase.
5. The time synchronization method according to claim 1, wherein the obtaining a vibration measurement curve of each vibration measurement system and a noise measurement curve of each noise measurement system comprises:
in the test process, a vibration measuring system and a noise measuring system collect vibration signals and noise signals measured by a vibration sensor and a noise sensor in real time;
and filtering and normalizing the vibration signal and the noise signal to obtain a vibration measurement curve and a noise measurement curve.
6. The time synchronization method according to claim 4, wherein the vibration measurement system and the noise measurement system collect vibration signals and noise signals measured by the vibration sensor and the noise sensor in real time during the test process, and the collection is stopped at least 10s after the test recovery stage, so as to ensure that the first vibration peak and the noise peak of the test recovery stage are collected.
7. The time synchronization method of claim 1, wherein when the test reaches the active phase, the test bench controller issues a timing command and holds until the end of the active phase of the test is cancelled.
8. The method of claim 7, wherein the measuring system coupled to the controller receiving the command and determining the system zero based on the command comprises: and the measuring system connected with the controller receives the time system command and sets the time of the measuring system corresponding to the voltage rising edge of the received time system command as a time system zero point.
9. The method of claim 1, wherein the noise sensor is mounted in the same enclosure as the vibration sensor in the test piece, the vibration sensor is mounted on a mounting bracket for each component in the enclosure for measuring X, Y, Z three-directional vibration data, and the noise sensor is mounted on and at a distance from the interior wall of the enclosure for measuring the noise signal in the enclosure.
10. The method of time synchronization of claim 1, wherein the vibration sensor has a range of ± 500g, a frequency range of 0.3Hz to 4000 Hz; the measuring range of the noise sensor is 130dB-160dB, and the frequency range is 0.3Hz-4000 Hz.
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