CN115541415A - Ultra-high magnitude impulse response spectrum testing method, system, medium, equipment and terminal - Google Patents
Ultra-high magnitude impulse response spectrum testing method, system, medium, equipment and terminal Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention belongs to the technical field of an impact response spectrum test, and discloses a method, a system, a medium, equipment and a terminal for testing an ultra-high order impact response spectrum, wherein an ultra-high order impact monitoring sensor is arranged on the table board of a tested impact response spectrum test device, and the ultra-high order impact monitoring sensor is sequentially connected with a signal adjuster, a PXI device and a central processing unit by using wires; collecting and preprocessing ultra-high magnitude impact response spectrum test data; self-defining a calibration test signal, recording an acquired waveform, and analyzing an ultra-high-magnitude impulse response spectrum test signal; determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; and converting the acceleration response into an impact response spectrum, and determining the maximum expected environment and the optimal test experiment condition according to the dynamic response data. The ultra-high magnitude impulse response spectrum test system has the advantages of simple structure, low test cost, high safety and good economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of an impact response spectrum test, and particularly relates to a method, a system, a medium, equipment and a terminal for testing an ultra-high magnitude impact response spectrum.
Background
At present, an impact response spectrum testing machine is environmental test equipment used for completing an impact response spectrum test, the impact response spectrum is an analysis basis for implementing impact resistance design on products and is also a basic parameter of an impact environment simulation test in production, and the impact response spectrum test becomes one of necessary environmental tests in aviation and aerospace key model scientific research and production and related major scientific and technological specials.
Since the impact motion may cause some damage and destruction to the equipment, people need to study the nature and harsh conditions of the impact environment in which the equipment is located, and check the impact resistance of the equipment through an environment simulation experiment to improve the impact resistance of the equipment. The impulse response spectrum is generally an important concept for a wide range of applications in engineering. The international electrotechnical commission, the technical committee to which the international organization for standardization belongs, and the national standards of china have taken impact spectrum as one of the methods for specifying impact environments. Therefore, the impact spectrum is the analysis basis for implementing the impact resistance design on the equipment and is also the basic parameter for controlling the simulation experiment of the product impact environment. The impact response spectrum reflects environmental characteristics, and a basis can be provided for the impact resistance of the equipment according to the analysis of the impact response spectrum.
In recent years, with the increasing awareness of environmental tests, higher requirements are put on the simulation of impact environments, and the impact response spectrum test becomes a test project which is necessary for the factory acceptance of many products. Therefore, it is necessary to design a new ultra-high magnitude impulse response spectrum testing method.
Through the above analysis, the problems and defects of the prior art are as follows: the existing test aiming at the impact response spectrum test has the defects of complex structure, high cost, large occupied space, difficult control of impact excitation and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method, a system, a medium, equipment and a terminal for testing an ultra-high magnitude impulse response spectrum.
The invention is realized in this way, a method for testing an ultra-high magnitude impact response spectrum, which comprises the following steps:
step one, connecting an ultrahigh-magnitude impact response spectrum testing device: the method comprises the following steps of mounting an ultra-high magnitude impact monitoring sensor on a table board of a tested impact response spectrum testing device, and sequentially connecting the ultra-high magnitude impact monitoring sensor with a signal adjuster, a PXI device and a central processing unit by using wires;
step two, collecting and preprocessing the test data of the ultra-high magnitude impulse response spectrum: acquiring ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data by using a data acquisition module, and performing denoising and enhancing preprocessing and signal transmission on the acquired data by using a data preprocessing module;
step three, analyzing and processing the test signal of the ultra-high magnitude impulse response spectrum: realizing a signal self-defining function through a function generator module, and self-defining a calibration test signal; sequentially recording acquired waveforms through an oscilloscope module, and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signals;
step four, testing the ultra-high magnitude impact response spectrum: determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; the acceleration response is converted into an impact response spectrum, and the maximum expected environment and the optimal test experimental conditions are determined according to the dynamic response data.
Further, the ultra-high-magnitude impact monitoring sensor in the step one is an ultra-high-magnitude impact piezoelectric acceleration monitoring sensor.
Further, the connection method of the ultra-high magnitude impulse response spectrum testing device in the first step includes:
and connecting the output end of the ultra-high magnitude impact monitoring sensor with the input end of the signal adapter by using a wire, connecting the output end of the signal adapter with the input end of the PXI device by using a wire, and connecting the output end of the PXI device with the input end of the central processing unit by using a wire.
Further, the preprocessing method for the test data of the ultra-high magnitude impulse response spectrum in the second step includes:
(1) Performing modal decomposition on the original ultrahigh-magnitude impact response spectrum test data set by adopting a complete noise-assisted aggregation empirical mode decomposition algorithm to obtain a plurality of inherent modal function components;
(2) Performing Pearson correlation analysis on the original test data and a plurality of inherent modal function components respectively to obtain a correlation coefficient between each inherent modal function component and the original test data;
(3) Extracting the test data characteristics of the ultra-high-order impulse response spectrum according to the correlation coefficient between each inherent modal function component and the original test data, and denoising by using a bidirectional denoising autoencoder network.
Further, the method for analyzing and processing the ultra-high magnitude impulse response spectrum test signal in step three includes:
(1) Self-defining an ultra-high magnitude impact response spectrum calibration test signal through a function generator, recording and acquiring an ultra-high magnitude impact response spectrum test waveform through an oscilloscope module, and receiving the signal;
(2) The amplifying circuit amplifies the received ultrahigh-magnitude impact response spectrum test signal and outputs the amplified ultrahigh-magnitude impact response spectrum test signal to the A/D conversion circuit;
(3) And outputting the signals subjected to analog-to-digital conversion to a central processing unit by using an A/D conversion circuit, and analyzing and processing the signals and outputting and displaying results by using the central processing unit.
Further, the method for testing the ultra-high magnitude impulse response spectrum in the fourth step comprises the following steps:
(1) Excitation prediction is carried out on the ultra-high-magnitude impact monitoring sensor, and a finite element prediction method is selected according to excitation characteristics to predict dynamic response data of the ultra-high-magnitude impact monitoring sensor;
(2) Determining monitoring points of the ultra-high-magnitude impact monitoring sensor, and acquiring acceleration response data of the monitoring points of the ultra-high-magnitude impact monitoring sensor by adopting a mathematical model prediction method;
(3) And converting the acceleration responses of all monitoring points into an impact response spectrum by using a recursive digital filtering method, and determining a maximum expected environment and an optimal test experiment condition according to dynamic response data.
Another object of the present invention is to provide a system for testing an ultra-high magnitude impulse response spectrum by applying the method for testing an ultra-high magnitude impulse response spectrum, the system comprising:
the data acquisition module is connected with the central control module and is used for respectively acquiring the ultrahigh-magnitude impact spectrum test data and the ultrahigh-magnitude response spectrum test data through data acquisition equipment;
the data preprocessing module is connected with the central control module and used for carrying out denoising and enhancing processing on the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data through a data preprocessing program;
the signal transmission module is connected with the central control module and used for sending the preprocessed ultrahigh-magnitude impact spectrum test data and the preprocessed ultrahigh-magnitude response spectrum test data to the central processing unit through the wireless communication device;
the central control module is connected with the data acquisition module, the data preprocessing module, the signal transmission module, the function generator module, the oscilloscope module, the test module and the data storage and display module and is used for coordinating and controlling the normal operation of each module of the ultra-high-magnitude impact response spectrum test system through the central processing unit;
the function generator module is connected with the central control module and is used for realizing the function of self-defining signals through the function generator and self-defining the ultra-high-magnitude impact response spectrum test signals;
the oscilloscope module is connected with the central control module and is used for sequentially recording acquired waveforms through an oscilloscope and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signal;
the test module is connected with the central control module and used for monitoring dynamic response data and acceleration response data of the sensor by determining the ultrahigh-magnitude impact; converting the acceleration response into an impact response spectrum, and determining a maximum expected environment and an optimal test experiment condition according to the dynamic response data;
and the data storage and display module is connected with the central control module and is used for storing the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data, the ultrahigh-magnitude impact spectrum test data subjected to noise enhancement processing and ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude impact response spectrum test result through the cloud database server and displaying the data and the ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude response spectrum test result through the display.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for applying the steps of the ultra-high magnitude impulse response spectroscopy test method when executed on an electronic device.
It is another object of the present invention to provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to apply the steps of the ultra-high magnitude impulse response spectroscopy test method.
Another object of the present invention is to provide an information data processing terminal, which is used for implementing the ultra-high magnitude impulse response spectrum testing system.
In combination with the above technical solutions and the technical problems to be solved, please analyze the advantages and positive effects of the technical solutions to be protected in the present invention from the following aspects:
first, aiming at the technical problems existing in the prior art and the difficulty in solving the problems, the technical problems to be solved by the technical scheme of the present invention are closely combined with the technical scheme to be protected and the results and data in the research and development process, and some creative technical effects brought after the problems are solved are analyzed in detail and deeply. The specific description is as follows:
the ultra-high magnitude impact monitoring sensor is installed on the table board of the tested impact response spectrum testing device, and the ultra-high magnitude impact monitoring sensor is sequentially connected with the signal adjuster, the PXI device and the central processing unit through the wires, so that the ultra-high magnitude impact response spectrum testing method is simple in structure, reasonable in design, simple and convenient to use and operate, low in cost and convenient to install; secondly, collecting ultra-high magnitude impulse response spectrum test data and carrying out denoising and enhancing pretreatment; the calibration test signal is customized, the acquired waveforms are sequentially recorded, and signal receiving and analysis processing of the ultra-high-magnitude impact response spectrum test signal are performed, so that the safety is high, and the impact spectrum and the response spectrum can be simultaneously detected; finally, determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; the acceleration response is converted into an impact response spectrum, the maximum expected environment and the optimal test experiment condition are determined according to the dynamic response data, and the method is high in practicability and good in effect.
The invention provides a design idea and a method of a test fixture based on a conduction amplification effect technology, and the design idea and the method are successfully applied to the test, so that the key technical problem in an ultrahigh-magnitude impact response spectrum test is solved, and a good effect is obtained. The invention also provides a new mode suitable for the technical problem of test engineering, namely 'real operation and touch-locking problem-integrated force attack and restraint'. Through repeated analysis, the tool and the monitoring sensor are determined to be key factors influencing the test, a set of process operation steps suitable for the test and an equipment state maintaining method are explored and summarized, and the impact acceleration stability can be maintained within 10%.
Aiming at the problems of small effective application range, poor impact resistance and low-frequency response lag of the monitoring sensor found in the exploration and research tests, the invention firstly analyzes the structure and the process state of the sensor, finds that the output welding quality of the sensor is different and has great influence on the actual effective application range of the sensor. Through communication and discussion with a sensor manufacturer for many times, the existing welding process is improved, the trial sensor provided by the manufacturer is obviously improved in the aspect of test performance, and the requirements of a large number of impact tests are met; in the probing and exploring tests, the collection and analysis of the sensor signal recovery time data find that the effective recovery time to the zero position is about 15min after each impact test, thereby solving the accuracy of low-frequency detection of the sensor and determining the test operation requirement that the interval between two impacts is not less than 15 min.
Secondly, considering the technical scheme as a whole or from the perspective of products, the technical effect and advantages of the technical scheme to be protected by the invention are specifically described as follows:
the ultra-high magnitude impulse response spectrum test system provided by the invention has the advantages of simple structure, low test cost and high safety, can provide feasible test methods and steps for later-stage same-type tests, also provides support and guarantee for developing aerospace type test markets, and has good economic and social benefits.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing an ultra-high magnitude impulse response spectrum according to an embodiment of the present invention;
FIG. 2 is a flow chart of the test data preprocessing of the ultra-high magnitude impulse response spectrum according to the embodiment of the present invention;
fig. 3 is a flowchart of an analysis processing method of an ultra-high magnitude impulse response spectrum test signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a method, a system, a medium, equipment and a terminal for testing an ultra-high-magnitude impact response spectrum, and the invention is described in detail with reference to the accompanying drawings.
1. Illustrative embodiments are explained. This section is an explanatory embodiment expanding on the claims so as to fully understand how the present invention is embodied by those skilled in the art.
As shown in fig. 1, the method for testing an ultra-high magnitude impulse response spectrum provided by the embodiment of the present invention includes the following steps:
s101, connecting the ultrahigh-order impulse response spectrum testing device: the method comprises the following steps of mounting an ultra-high magnitude impact monitoring sensor on a table board of a tested impact response spectrum testing device, and sequentially connecting the ultra-high magnitude impact monitoring sensor with a signal adjuster, a PXI device and a central processing unit by using wires;
s102, collecting and preprocessing the test data of the ultra-high-magnitude impulse response spectrum: acquiring ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data by using a data acquisition module, and performing denoising and enhancing preprocessing and signal transmission on the acquired data by using a data preprocessing module;
s103, analyzing and processing the test signal of the ultra-high magnitude impulse response spectrum: realizing the function of self-defining signals through a function generator module, and self-defining calibration test signals; sequentially recording acquired waveforms through an oscilloscope module, and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signals;
s104, testing the ultra-high magnitude impact response spectrum: determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; the acceleration response is converted into an impact response spectrum, and the maximum expected environment and the optimal test experimental conditions are determined according to the dynamic response data.
The ultra-high-magnitude impact monitoring sensor in step S104 provided by the embodiment of the present invention is an ultra-high-magnitude impact piezoelectric acceleration monitoring sensor.
The connection method of the ultra-high-magnitude impulse response spectrum testing device in the step S101 provided by the embodiment of the invention comprises the following steps: the output end of the ultra-high magnitude impact monitoring sensor is connected with the input end of the signal adapter through a wire, the output end of the signal adapter is connected with the input end of the PXI device through a wire, and the output end of the PXI device is connected with the input end of the central processing unit through a wire.
As shown in fig. 2, the method for preprocessing the ultra-high magnitude impulse response spectrum test data in step S102 according to the embodiment of the present invention includes:
s201, performing modal decomposition on an original ultrahigh-magnitude impact response spectrum test data set by adopting a complete noise-assisted aggregation empirical mode decomposition algorithm to obtain a plurality of inherent modal function components;
s202, performing Pearson correlation analysis on the original test data and the plurality of inherent mode function components respectively to obtain a correlation coefficient between each inherent mode function component and the original test data;
s203, extracting the characteristics of the test data of the ultra-high-order impulse response spectrum according to the correlation coefficient between each inherent mode function component and the original test data, and denoising by using a bidirectional denoising self-encoder network.
According to the test method for the ultra-high magnitude impact response spectrum provided by the embodiment of the invention, the ultra-high magnitude impact monitoring sensor is firstly installed on the table board of the tested impact response spectrum test device, and the ultra-high magnitude impact monitoring sensor is sequentially connected with the signal adjuster, the PXI device and the central processing unit by using the wires.
As shown in fig. 3, the method for analyzing and processing the ultra-high magnitude impulse response spectrum test signal in step S103 according to the embodiment of the present invention includes:
s301, customizing a calibration test signal of the ultra-high magnitude impact response spectrum through a function generator, recording and acquiring a test waveform of the ultra-high magnitude impact response spectrum through an oscilloscope module, and receiving the signal;
s302, the amplifying circuit amplifies the received ultrahigh-magnitude impact response spectrum test signal and outputs the amplified ultrahigh-magnitude impact response spectrum test signal to the A/D conversion circuit;
and S303, outputting the signal subjected to analog-to-digital conversion to a central processing unit by using the A/D conversion circuit, and analyzing and processing the signal and outputting and displaying the result by using the central processing unit.
The embodiment of the invention collects the test data of the ultra-high magnitude impulse response spectrum and carries out the preprocessing of denoising and enhancing; the calibration test signal is customized, the acquired waveforms are recorded in sequence, signal receiving and analysis processing of the ultra-high magnitude impulse response spectrum test signal are performed, safety is high, and the impulse spectrum and the response spectrum can be detected simultaneously.
The method for testing the ultra-high-magnitude impulse response spectrum in the step S104 provided by the embodiment of the present invention includes:
(1) Excitation prediction is carried out on the ultra-high-order impact monitoring sensor, and a finite element prediction method is selected to predict the dynamic response data of the ultra-high-order impact monitoring sensor according to the excitation characteristics;
(2) Determining monitoring points of the ultra-high-magnitude impact monitoring sensor, and acquiring acceleration response data of the monitoring points of the ultra-high-magnitude impact monitoring sensor by adopting a mathematical model prediction method;
(3) And converting the acceleration responses of all monitoring points into an impact response spectrum by using a recursive digital filtering method, and determining a maximum expected environment and an optimal test experiment condition according to dynamic response data.
The method comprises the steps of determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; the acceleration response is converted into an impact response spectrum, the maximum expected environment and the optimal test experiment condition are determined according to the dynamic response data, and the method is high in practicability and good in effect.
The system for testing the ultra-high magnitude impulse response spectrum provided by the embodiment of the invention comprises:
the data acquisition module is connected with the central control module and is used for respectively acquiring the ultrahigh-magnitude impact spectrum test data and the ultrahigh-magnitude response spectrum test data through data acquisition equipment;
the data preprocessing module is connected with the central control module and used for carrying out denoising and enhancing processing on the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data through a data preprocessing program;
the signal transmission module is connected with the central control module and used for sending the preprocessed ultrahigh-magnitude impact spectrum test data and the preprocessed ultrahigh-magnitude response spectrum test data to the central processing unit through the wireless communication device;
the central control module is connected with the data acquisition module, the data preprocessing module, the signal transmission module, the function generator module, the oscilloscope module, the test module and the data storage and display module and is used for coordinating and controlling the normal operation of each module of the ultra-high-magnitude impact response spectrum test system through the central processing unit;
the function generator module is connected with the central control module and is used for realizing the function of self-defining signals through the function generator and self-defining the ultra-high-magnitude impact response spectrum test signals;
the oscilloscope module is connected with the central control module and is used for sequentially recording acquired waveforms through an oscilloscope and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signal;
the test module is connected with the central control module and used for monitoring dynamic response data and acceleration response data of the sensor by determining the ultrahigh-magnitude impact; converting the acceleration response into an impact response spectrum, and determining a maximum expected environment and an optimal test experiment condition according to the dynamic response data;
and the data storage and display module is connected with the central control module and is used for storing the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data, the ultrahigh-magnitude impact spectrum test data subjected to noise enhancement processing and ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude impact response spectrum test result through the cloud database server and displaying the data and the ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude response spectrum test result through the display.
The ultra-high magnitude impulse response spectrum testing system provided by the embodiment of the invention has the advantages of simple structure, low testing cost and high safety, can provide feasible testing methods and steps for later-stage same-type tests, also provides support and guarantee for developing aerospace type test markets, and has good economic and social benefits.
2. Application examples. In order to prove the creativity and the technical value of the technical scheme of the invention, the part is the application example of the technical scheme of the claims on specific products or related technologies.
An application embodiment of the present invention provides a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to apply the steps of the ultra-high magnitude impulse response spectrum test method when executed on an electronic device.
An embodiment of the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to apply the steps of the ultra-high magnitude impulse response spectroscopy test method.
The application embodiment of the invention provides an information data processing terminal, which is used for realizing the ultra-high magnitude impulse response spectrum testing system.
3. Evidence of the relevant effects of the examples. The embodiment of the invention achieves some positive effects in the process of research and development or use, and has great advantages compared with the prior art, and the following contents are described by combining data, diagrams and the like in the test process.
5363 and at the beginning of 1.2021, the experiment of the ultra-high-magnitude impact response spectrum of the spacecraft thrust device of a certain model is completed by the requirement of a certain research institute. According to the introduction of the consignor, the test can be done without any unit in China, and if I can complete the test, more other test tasks can be undertaken. On the other hand, the company establishes a special attack and customs group, and the technical analysis considers that the test difficulty mainly comprises the following points:
(1) According to test conditions, the high-frequency response value is very high, the low-frequency response value is very low, the tolerance requirement of an acceleration response curve is strict, and the method is difficult to realize on a test bed;
(2) The monitoring point is required to be in a designated area of the product clamp, the requirements on the response characteristic and the transfer characteristic of the test clamp are strict under the condition of a large number of values, and the test clamp is important to the success or failure of the test;
(3) The test magnitude basically reaches the limit capability of the existing test equipment, so that the equipment adjusting space is very small during the test, and the test equipment is easy to damage and fail;
(4) During testing, the impact energy is required to be ultrahigh, the low-frequency response is very low, great difficulty is caused in selection and use of a monitoring sensor, otherwise, the signal acquisition accuracy is influenced, and even the sensor is easily damaged.
2. Protocol and implementation
2.1 tissue assurance
The completion of the test task is important for the business expansion of the company, and the test requirement of the client is high and the realization difficulty is high. Therefore, the company pays high attention to the fact that a special attack and customs group which takes the technical department as the leading part and the technical backbone of the experimental engineering department as the main part is established, overall arrangement is achieved from the aspects of organization and coordination of the experiment, the technical scheme, implementation steps, experiment guarantee, risk pre-judgment and the like, the detail is achieved as far as possible, the experiment requirements are guaranteed to be completed and met, and the approval of users is obtained.
2.2 Innovative technical attack and defense working mode
Aiming at the test condition requirements provided by an entrusting party, a technical department and a test engineering department determine a technical attack scheme taking 'actual operation and bottom-locking problem-integrated force attack' as a working mode, carry out bottom-finding and exploration work on the ultra-high-magnitude impact test according to the scheme so as to verify and determine key factors influencing the test, and search a feasible test implementation operation method so as to solve the problems of acceleration response curve adjustment and over-tolerance, the setting size of impact air pressure, the rigidity and the cushioning position of an impact spectrum shape modulator, the impact resistance times and the like. Through continuous and repeated model investigation, analysis and research, the embodiment of the invention determines that the tool and the monitoring sensor are key factors influencing the test, and explores and summarizes a set of process operation steps and an equipment state maintaining method suitable for the test, so that the stability of the impact acceleration can be maintained within 10 percent.
2.3 Innovative test fixture design idea
And specially designing a product test fixture according to test requirements. Through the investigation and research tests, when a traditional test fixture with a relatively thick weight is used, when the response acceleration of the impact table surface reaches 30000g, the response acceleration appearing on the fixture is less than 6000g, the attenuation is quite large, and the required impact air pressure of the equipment is large. Therefore, the traditional design idea and method of the product test fixture can not be adapted to the requirement of the test at all, and a new design idea and method of the product test fixture needs to be sought. In order to solve the design problem of the test fixture, the embodiment of the invention provides a design idea of the test fixture based on a conduction amplification effect technology through research, data lookup, technical analysis and discussion. Under the guidance of a technical director, a tool designer develops the structural design of the test fixture, the design principle is that the test fixture adopts a thin-wall structure as far as possible on the premise of meeting the impact strength, and the sample mounting position is on the top end of the test fixture as far as possible, so that the conduction amplification effect is utilized. After the design, the stress measurement and calculation are carried out on the structural model, so that the fixture can meet the requirements of test strength and magnitude response. Meanwhile, the test fixture designed by the new technology is utilized to ensure that the required equipment impact air pressure is from 6 to 7kg/cm under the condition of the same impact magnitude 2 Reduced to 4.5kg/cm 2 And on the left and right sides, the full utilization and the improvement of the test capability of the equipment are realized, and the guarantee is provided for the wide-range adjustment of the equipment.
2.4 break through the technical bottleneck of sensor application
Aiming at the problems of small effective application range, poor impact resistance and low-frequency response lag of the monitoring sensor found in the research and exploration tests, the embodiment of the invention firstly analyzes the structure and the process state of the sensor, finds that the output welding quality of the sensor is different and has great influence on the actual effective application range of the sensor. Through communication and discussion with a sensor manufacturer for many times, the existing welding process is improved, the trial sensor provided by the final manufacturer is obviously improved in the aspect of test performance, and the requirements of a large number of impact tests are met. Meanwhile, in the process of backing up and exploring tests, through collecting and analyzing the data of the recovery time of the sensor signals, the time for effectively recovering to the zero position after each impact test is found to be about 15min, so that the accuracy of low-frequency detection of the sensor is also solved, and the test operation requirement that the interval between two times of impact is not less than 15min is determined.
3. Effects of the implementation
If the guarantee quantity of the product is guaranteed in term, the task of 'ultra-high magnitude impact response spectrum test' proposed by the consignor is completed and approved by the consignor, a feasible test method and steps are provided for the later test of the same type, and support and guarantee are provided for companies to develop aerospace type test markets.
4. Technical result
1) The embodiment of the invention provides a design idea and a method of a test fixture based on a 'conduction amplification effect technology', and the design idea and the method are successfully applied to the test, so that the key technical problem in the ultrahigh-magnitude impact response spectrum test is solved, and a good effect is obtained; 2) The embodiment of the invention provides a new mode suitable for experimental engineering technical problem attack, namely 'practical operation and basic investigation-locking problem-integrated force attack and restriction'.
It should be noted that the embodiments of the present invention can be realized by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided on a carrier medium such as a disk, CD-or DVD-ROM, programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier, for example. The apparatus and its modules of the present invention may be implemented by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of hardware circuits and software, e.g., firmware.
The above description is only for the purpose of illustrating the embodiments of the present invention, and the scope of the present invention should not be limited thereto, and any modifications, equivalents and improvements made by those skilled in the art within the technical scope of the present invention as disclosed in the present invention should be covered by the scope of the present invention.
Claims (10)
1. A test method for an ultra-high-order impact response spectrum is characterized by comprising the following steps:
step one, connecting an ultrahigh-magnitude impact response spectrum testing device: the method comprises the following steps of mounting an ultra-high magnitude impact monitoring sensor on a table board of a tested impact response spectrum testing device, and sequentially connecting the ultra-high magnitude impact monitoring sensor with a signal adjuster, a PXI device and a central processing unit by using wires;
step two, collecting and preprocessing the test data of the ultra-high magnitude impulse response spectrum: acquiring ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data by using a data acquisition module, and performing denoising and enhancing preprocessing and signal transmission on the acquired data by using a data preprocessing module;
step three, analyzing and processing the test signal of the ultra-high magnitude impulse response spectrum: realizing the function of self-defining signals through a function generator module, and self-defining calibration test signals; sequentially recording acquired waveforms through an oscilloscope module, and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signals;
step four, testing the ultra-high magnitude impact response spectrum: determining dynamic response data and acceleration response data of the ultra-high-magnitude impact monitoring sensor; the acceleration response is converted into an impact response spectrum, and the maximum expected environment and the optimal test experimental conditions are determined according to the dynamic response data.
2. The ultra-high magnitude impact response spectrum testing method according to claim 1, wherein the ultra-high magnitude impact monitoring sensor in the first step is an ultra-high magnitude impact piezoelectric acceleration monitoring sensor.
3. The ultra-high magnitude impulse response spectrum testing method of claim 1, wherein the connection method of the ultra-high magnitude impulse response spectrum testing device in the first step comprises:
and connecting the output end of the ultra-high magnitude impact monitoring sensor with the input end of the signal adapter by using a wire, connecting the output end of the signal adapter with the input end of the PXI device by using a wire, and connecting the output end of the PXI device with the input end of the central processing unit by using a wire.
4. The ultra-high magnitude impulse response spectrum test method of claim 1, wherein the pre-processing method of the ultra-high magnitude impulse response spectrum test data in the second step comprises:
(1) Performing modal decomposition on an original ultrahigh-magnitude impact response spectrum test data set by adopting a complete noise-assisted aggregation empirical mode decomposition algorithm to obtain a plurality of inherent modal function components;
(2) Performing Pearson correlation analysis on the original test data and a plurality of inherent modal function components respectively to obtain a correlation coefficient between each inherent modal function component and the original test data;
(3) Extracting the test data characteristics of the ultra-high-order impulse response spectrum according to the correlation coefficient between each inherent modal function component and the original test data, and denoising by using a bidirectional denoising autoencoder network.
5. The ultra-high magnitude impulse response spectrum test method of claim 1, wherein the method for analyzing and processing the ultra-high magnitude impulse response spectrum test signal in step three comprises:
(1) Self-defining an ultra-high magnitude impact response spectrum calibration test signal through a function generator, recording and acquiring an ultra-high magnitude impact response spectrum test waveform through an oscilloscope module, and receiving the signal;
(2) The amplifying circuit amplifies the received ultrahigh-magnitude impact response spectrum test signal and outputs the amplified ultrahigh-magnitude impact response spectrum test signal to the A/D conversion circuit;
(3) And outputting the signal subjected to the analog-to-digital conversion to a central processing unit by using an A/D conversion circuit, and analyzing and processing the signal and outputting and displaying a result by using the central processing unit.
6. The ultra-high magnitude impact response spectrum testing method of claim 1, wherein the ultra-high magnitude impact response spectrum testing method in step four comprises:
(1) Excitation prediction is carried out on the ultra-high-magnitude impact monitoring sensor, and a finite element prediction method is selected according to excitation characteristics to predict dynamic response data of the ultra-high-magnitude impact monitoring sensor;
(2) Determining monitoring points of the ultra-high-magnitude impact monitoring sensor, and acquiring acceleration response data of the monitoring points of the ultra-high-magnitude impact monitoring sensor by adopting a mathematical model prediction method;
(3) And converting the acceleration responses of all monitoring points into an impact response spectrum by using a recursive digital filtering method, and determining a maximum expected environment and an optimal test experiment condition according to dynamic response data.
7. An ultra-high-magnitude impulse response spectrum test system applying the ultra-high-magnitude impulse response spectrum test method as claimed in any one of claims 1 to 6, wherein the ultra-high-magnitude impulse response spectrum test system comprises:
the data acquisition module is connected with the central control module and is used for respectively acquiring the ultrahigh-magnitude impact spectrum test data and the ultrahigh-magnitude response spectrum test data through data acquisition equipment;
the data preprocessing module is connected with the central control module and used for carrying out denoising and enhancing processing on the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data through a data preprocessing program;
the signal transmission module is connected with the central control module and used for sending the preprocessed ultrahigh-magnitude impact spectrum test data and the preprocessed ultrahigh-magnitude response spectrum test data to the central processing unit through the wireless communication device;
the central control module is connected with the data acquisition module, the data preprocessing module, the signal transmission module, the function generator module, the oscilloscope module, the test module and the data storage and display module and is used for coordinating and controlling the normal operation of each module of the ultra-high-magnitude impact response spectrum test system through the central processing unit;
the function generator module is connected with the central control module and is used for realizing the function of self-defining signals through the function generator and self-defining the ultra-high-order impulse response spectrum test signals;
the oscilloscope module is connected with the central control module and is used for sequentially recording acquired waveforms through an oscilloscope and performing signal receiving and analysis processing on the ultrahigh-magnitude impulse response spectrum test signal;
the test module is connected with the central control module and used for monitoring dynamic response data and acceleration response data of the sensor by determining the ultrahigh-magnitude impact; converting the acceleration response into an impact response spectrum, and determining a maximum expected environment and an optimal test experiment condition according to the dynamic response data;
and the data storage and display module is connected with the central control module and is used for storing the acquired ultrahigh-magnitude impact spectrum test data and ultrahigh-magnitude response spectrum test data, the ultrahigh-magnitude impact spectrum test data subjected to noise enhancement processing and ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude impact response spectrum test result through the cloud database server and displaying the data and the ultrahigh-magnitude response spectrum test data, the signal self-defining result, the signal analysis processing result and the ultrahigh-magnitude response spectrum test result through the display.
8. A computer program product stored on a computer readable medium, comprising computer readable program for providing a user input interface for applying the steps of the ultra-high magnitude impulse response spectroscopy test method of any one of claims 1 to 6 when executed on an electronic device.
9. A computer readable storage medium storing instructions which, when executed on a computer, cause the computer to apply the steps of the ultra-high magnitude impulse response spectroscopy test method of any one of claims 1 to 6.
10. An information data processing terminal, characterized in that the information data processing terminal is used for implementing the ultra-high magnitude impulse response spectrum test system of claim 7.
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