CN112595479A - Sine wave waveform combination compensation method for arresting impact test - Google Patents
Sine wave waveform combination compensation method for arresting impact test Download PDFInfo
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- CN112595479A CN112595479A CN202010503658.XA CN202010503658A CN112595479A CN 112595479 A CN112595479 A CN 112595479A CN 202010503658 A CN202010503658 A CN 202010503658A CN 112595479 A CN112595479 A CN 112595479A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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Abstract
The invention discloses a sine wave waveform combination compensation method for a blocking impact test, which is characterized by comprising the following steps of: adding a half sine wave to the front of an original arresting impact waveform to perform speed compensation so as to minimize an acceleration amplitude and table displacement; secondly, adding a complete sine wave to the front of the compensated waveform to perform displacement compensation, so that the speed and the acceleration of the table top of the vibration table are both 0; and step three, carrying out a test according to the combined waveform after the two times of compensation. The invention can carry out the arresting impact test on the vibration table with partial speed and displacement which do not meet the test conditions.
Description
Technical Field
The invention relates to a sine wave waveform combination compensation method for a blocking impact test, which can enable a vibration table with partial speed and displacement not meeting test conditions to carry out the blocking impact test.
Background
The product still can normally work under the action of continuously bearing overload of the product and the external environment, and the product needs to be verified through test equipment in a laboratory. The arresting landing process is completely different from the landing approach mode of a common airplane, the airplane must land on a calibrated gliding channel, and the airplane is forced to decelerate and brake in a short distance by a landing brake arresting cable. The impact load and the arresting cable forced braking load at the moment of arresting landing have larger difference with those of common landing, but the test value is higher in the arresting landing process, the duration is longer than that of a common impact test, the requirement on a vibration table is higher, if the original arresting impact test waveform is directly applied in the laboratory product verification process, the acceleration, speed and displacement curves of the vibration table are shown in figure 1, the displacement reaches 900mm, and no matter the traditional mechanical hydraulic vibration table or electromagnetic vibration table is used, the arresting impact test cannot be directly implemented by the original test curve at present.
Currently, most of the vibration tables usually adopt a high-pass filtering mode to process an original curve in the implementation of the test, and the method mainly has two limitations: 1. after high-pass filtering, part of high-frequency signals are removed, and the actual test value is lower than the standard requirement, so that the actual product is under-tested. 2. The actual vibration balance position of the vibration table in the test process cannot be changed through high-pass filtering, so that the resource waste of the actual test of the vibration table is caused, and the test with higher magnitude is difficult to deal with.
Disclosure of Invention
The invention aims to provide a sine wave waveform combination compensation method for a blocking impact test, which can effectively reduce the speed and the displacement of a moving part and can carry out the blocking impact test on a vibration table of which the partial speed and the displacement do not meet the test conditions.
The invention aims to be realized by the following technical scheme:
a sine wave waveform combination compensation method for a damming impact test comprises the following steps:
adding a half sine wave to the front of an original arresting impact waveform to perform speed compensation so as to minimize an acceleration amplitude and table displacement;
secondly, adding a complete sine wave to the front of the compensated waveform to perform displacement compensation, so that the speed and the acceleration of the table top of the vibration table are both 0;
and step three, carrying out a test according to the combined waveform after the two times of compensation.
Wherein, the parameters of the half sine wave are as follows:
determining an initial velocity value V by the formula (1)0Oscillating the velocity profile up and down on the X-axis;
determination of the peak value A of the half-sine wave by equation (2)1And the initial value V of velocity0Relation, determining the frequency f of the half-sine wave1；
Determination of vibration table top displacement D introduced by half sine wave through formula (3)1And the initial value V of velocity0Relation, determining an amplitude spectral line;
A1＝V0πf1 (2)
the parameters of the complete sine wave are as follows:
determining the balance position of the table top of the vibration table in the test process and then determining the displacement D of the table top of the vibration table introduced by the complete sine wave2；
Determining the frequency f of the complete sine wave from equation (4)2Amplitude of the complete sine wave a2
The invention adopts a sine wave waveform combination method, reduces the maximum displacement and the maximum speed of the vibration table in the whole test process, simultaneously ensures that the vibration table with partial speed and displacement which do not meet the test conditions can carry out the test by determining the sine wave frequency and amplitude parameters, controls the acceleration amplitude in the parameter determination process, introduces a load quantity value lower than the test quantity value, does not change the test curve part at all, and avoids the over-test introduced by waveform compensation.
The method has simple parameter determination, can be conveniently applied to the vibration table arresting impact test, can implement the test on the vibration table with partial speed and displacement which do not meet the test conditions by reasonably determining the waveform parameters, controls the acceleration amplitude in the parameter determination process, introduces the load quantity value lower than the test quantity value, does not change the test curve part at all, and avoids the over-test introduced by waveform compensation.
Drawings
Fig. 1 is a schematic diagram of acceleration, velocity and displacement curves of a damming impact test.
FIG. 2 is a graph showing the relationship between the acceleration amplitude and the displacement induced by the compensation wave and the frequency.
FIG. 3 is a graph of displacement of the table top of the front and rear vibration tables for displacement compensation.
Fig. 4 is a schematic flow chart of a shock wave compensation method for a damming impact test.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 4, the sine wave combination compensation method for the arresting shock test according to the embodiment is applied to a vibration table, and a half-period sine wave and a full-period sine wave are loaded before a test waveform to compensate for speed and displacement, wherein the speed compensation is performed by adding the half-period sine wave, and the displacement compensation is performed by adding the full-period sine wave. The displacement and the speed are positioned in the parameter limit range of the vibrating table by controlling the wave frequency and the amplitude of the compensated sine wave, and the specific compensation process is as follows:
step one, adding a half sine wave to the front of the original blocking impact waveform to perform speed compensation. The parameters of the half sine wave are as follows:
determining an initial velocity value V by the formula (1)0The velocity profile is oscillated up and down on the X-axis.
Determination of the peak value A of the half-sine wave by equation (2)1And the initial value V of velocity0Relation, determining the frequency f of the half-sine wave1；
Determination of vibration table top displacement D introduced by half sine wave through formula (3)1And the initial value V of velocity0And (4) determining an amplitude spectral line. As shown in fig. 2, the magnitude of the induced acceleration and the table displacement are minimized.
A1＝V0πf1 (2)
Secondly, adding a complete sine wave in front of the compensated waveform to perform displacement compensation;
after the speed compensation, the displacement of the table top of the vibration table is shown in fig. 3, the vibration balance position of the table top of the vibration table deviates from the center of the table top, a section of complete sine wave is introduced for the displacement compensation, the advantage of the introduced complete sine wave is that after the introduction of the waveform is finished, the speed and the acceleration of the table top of the vibration table are both 0, the displacement compensation only acts on the displacement of a subsequent test spectrum, and the requirements on the complete sine wave are as follows:
generating a displacement initial value after the compensation is finished by using the whole sine wave;
after the complete sine wave compensation is finished, the acceleration and the speed should return to zero (the speed compensation problem of the second half section cannot be influenced);
the speed and the acceleration are not suitable to be too large in the complete sine wave compensation process;
the amplitude of the complete sine wave does not exceed the actual test wave amplitude.
Determining the balance position of the table top of the vibration table in the test process through the graph 3 and then determining the table top displacement D of the vibration table introduced by the complete sine wave2；
Determining the frequency f of the complete sine wave from equation 42Amplitude of the complete sine wave a2Displacement from table top D2The relationship between the frequency f and the frequency f of the complete sine wave in the displacement compensation process is that in order to reduce the negative influence on the arresting test caused by introducing the complete sine wave as much as possible, the displacement compensation is carried out by reducing the frequency form of the complete sine wave2For 1Hz, the amplitude A of the complete sine wave is determined by equation 42Is 0.0754m/s2, and the displacement curve of the table top of the vibration table after displacement compensation is as followsAs shown in fig. 3.
And step three, carrying out a test according to the combined waveform after the two times of compensation.
The invention and its variants belong to the protective category.
Claims (3)
1. A sine wave waveform combination compensation method for a damming impact test is characterized by comprising the following steps:
adding a half sine wave to the front of an original arresting impact waveform to perform speed compensation so as to minimize an acceleration amplitude and table displacement;
secondly, adding a complete sine wave to the front of the compensated waveform to perform displacement compensation, so that the speed and the acceleration of the table top of the vibration table are both 0;
and step three, carrying out a test according to the combined waveform after the two times of compensation.
2. A sine wave waveform combination compensation method for arresting shock test according to claim 1 wherein the parameters of half sine wave are as follows:
determining an initial velocity value V by the formula (1)0Oscillating the velocity profile up and down on the X-axis;
determination of the peak value A of the half-sine wave by equation (2)1And the initial value V of velocity0Relation, determining the frequency f of the half-sine wave1；
Determination of vibration table top displacement D introduced by half sine wave through formula (3)1And the initial value V of velocity0Relation, determining an amplitude spectral line;
A1＝V0πf1 (2)
3. a sine wave waveform combination compensation method for arresting shock testing according to claim 1 wherein the parameters of the complete sine wave are as follows:
determining the balance position of the table top of the vibration table in the test process and then determining the displacement D of the table top of the vibration table introduced by the complete sine wave2；
Determining the frequency f of the complete sine wave from equation (4)2Amplitude of the complete sine wave a2
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