CN218444386U - Passive dynamic vibration absorber natural frequency testing and debugging device - Google Patents
Passive dynamic vibration absorber natural frequency testing and debugging device Download PDFInfo
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- CN218444386U CN218444386U CN202222759166.4U CN202222759166U CN218444386U CN 218444386 U CN218444386 U CN 218444386U CN 202222759166 U CN202222759166 U CN 202222759166U CN 218444386 U CN218444386 U CN 218444386U
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- natural frequency
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Abstract
The utility model relates to a passive form dynamic vibration absorber natural frequency test and debugging device, test bench installation excitation equipment, and place the passive form dynamic vibration absorber that awaits measuring, displacement sensor arranges the passive form dynamic vibration absorber top that awaits measuring in, and fix by test bench through displacement sensor fixing device, acceleration sensor installs on test bench, the computer passes through signal acquisition processing equipment and power amplification equipment and connects excitation equipment, displacement sensor gathers the displacement output data of the passive form dynamic vibration absorber oscillator that awaits measuring, acceleration sensor gathers the acceleration input data of the passive form dynamic vibration absorber mounting point that awaits measuring, and with the data collection warp signal acquisition processing equipment filters the after-transmission for the computer. The utility model has the characteristics of measure accurate, the principle is clear, can carry out the test and the debugging of bump leveller fast.
Description
Technical Field
The utility model relates to a passive form dynamic vibration absorber natural frequency test and debugging device belongs to the vibration test field.
Background
The vibration absorber is used for reducing the vibration magnitude of a single-frequency line spectrum of the equipment, but the matching of the natural frequency of the vibration absorber and a target frequency is particularly important, and if the natural frequency of the vibration absorber is not properly adjusted, more severe vibration can be caused by anti-resonance.
The utility model discloses a patent for CN201510675166.8, the name is "a device and method of test bump leveller frequency", discloses a device of test bump leveller frequency, including data acquisition front end, power hammer, acceleration sensor and bump leveller fixing device, the power hammer strikes the bump leveller, and the data acquisition front end calculates through acceleration response signal and power signal and reachs the bump leveller frequency. The method is suitable for a large-damping vibration absorber, and obviously is not suitable for the vibration absorber with a rigidity element of spring steel, firstly, the knocking force of a force hammer is difficult to control through a formula
The calculation shows that the deformation x of the vibration absorber is very small, the spring steel is easy to plastically deform or directly damage when the vibration absorber is strongly knocked, and secondly, the knocking method is not suitable for the vibration absorber with the rigidity nonlinear characteristic, and different natural frequencies can be measured with different knocking forces.
Disclosure of Invention
The utility model discloses an aim at overcoming the limitation of the method of striking test natural frequency, provide a passive form dynamic vibration absorber natural frequency test and debugging device.
In order to achieve the above purpose, the utility model adopts the technical proposal that: the device comprises a vibration isolator, a platform, an excitation device, a power amplification device, a signal acquisition and processing device, a computer, a displacement sensor fixing device, a displacement sensor and an acceleration sensor, wherein the vibration isolator and the platform form a test bench, the excitation device is installed on the test bench and the passive dynamic vibration absorber to be tested is placed on the test bench, the displacement sensor is arranged at the top of the passive dynamic vibration absorber to be tested and is fixed beside the test bench through the displacement sensor fixing device, the acceleration sensor is installed on the test bench and is close to the passive dynamic vibration absorber to be tested, the computer is connected with the excitation device through the signal acquisition and processing device and the power amplification device and is used for outputting sweep frequency excitation to the test bench, the displacement sensor acquires displacement output data of a vibrator of the passive dynamic vibration absorber to be tested, the acceleration sensor acquires acceleration input data of a mounting point of the passive dynamic vibration absorber to be tested, and transmits the acquired data to the computer after being filtered by the signal acquisition and processing device.
Further, the platform is a thick platform, and the natural frequency of the free mode 1 order is more than 2 times higher than the natural frequency of the vibration absorber to be measured.
Further, the vertical natural frequency of the test bed is not more than 10Hz.
Further, the installation mode of the excitation device 5 adopts fixed installation, suspension installation or ejector rod type installation.
Further, the displacement sensor fixing device is fixed beside the test bed and is not contacted with any part of the test bed.
Further, the computer determines the natural frequency of the vibration absorber according to the peak value of the transmissibility of the acceleration input data to the displacement output data.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
1. compared with the knocking method, the utility model can test the natural frequency of the small damping vibration absorber with the elastic element made of spring steel;
2. compare in the strike method, the utility model discloses but the real vibration level of survey of analog device undercarriage realizes the accurate frequency modulation of bump leveller.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
in the figure: the device comprises a vibration isolator 1, a platform 2, a platform 3, a passive dynamic vibration absorber to be tested 4, an excitation device 5, a power amplification device 6, a signal acquisition and processing device 7, a computer 8, a displacement sensor fixing device 9, an acceleration sensor 10 and a displacement sensor 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and 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.
As shown in fig. 1, the passive dynamic vibration absorber natural frequency testing and debugging device comprises a vibration isolator 1, a platform 2, an excitation device 5, a power amplification device 6, a signal acquisition and processing device 7, a computer 8, a displacement sensor fixing device 9, a displacement sensor 11 and an acceleration sensor 10. Vibration isolator 1 and platform 2. The passive dynamic vibration absorber 4 to be tested is fixed on a test bed, the power amplification device 6, the signal acquisition processing device 7 and the computer 8 output sweep frequency excitation to the test bed through the excitation device 5, the displacement sensor 11 is installed on the displacement sensor fixing device 9, then the displacement sensor fixing device 9 is fixed beside the test bed consisting of the vibration isolator 1 and the platform 2 and is not in contact with any part of the test bed, the displacement sensor 11 acquires displacement output data of a vibrator of the passive dynamic vibration absorber to be tested, and the acceleration sensor 10 acquires acceleration input data of a mounting point of the passive dynamic vibration absorber to be tested.
The platform 2 should be as thick as possible, and the free mode 1 order natural frequency should be more than 2 times higher than the natural frequency of the vibration absorber to be tested, so as to prevent the modal frequency of the plate from becoming the excitation frequency of the vibration absorber and causing debugging failure.
The vibration isolator 1 and the platform 2 form a test bench, the vertical natural frequency of the installation mode of the test bench is as low as possible and is not more than 10Hz, and the test bench is beneficial to exciting the equipment to 'stir up'.
The installation manner of the excitation device 5 is not limited to fixed installation, suspended installation, jack-bar installation, and the like, as long as the installation platform can be excited.
The output path of the excitation is not limited to the illustrated computer 8, signal acquisition and processing device 7, power amplification device 6, excitation device 5, as long as there is a suitable way to cause the excitation device to output the excitation.
The displacement sensor fixing device 9 is fixed beside the test bench and does not contact with any part of the test bench, so that the vibration of the test bench is prevented from interfering the acquisition of displacement data.
The displacement sensor 11 collects displacement output data of the vibrator of the passive dynamic vibration absorber to be measured, and the acceleration sensor 10 collects acceleration input data of a mounting point of the passive dynamic vibration absorber to be measured. And determining the natural frequency of the vibration absorber according to the peak value of the transfer rate from the acceleration input data to the displacement output data.
The utility model discloses a theory of operation:
the rigidity of the vibration absorber is unchanged, and the vibration absorber is formed by K = m (2 pi f) 2 Can obtain
Wherein, K-absorber stiffness, f 1 Natural frequency, m, obtained from the first test 1 Vibrator quality at first test, f 0 Target frequency, m 0 And the oscillator quality when the target frequency is debugged. The purpose of adjusting the frequency can be achieved by increasing or decreasing the mass of the vibrator.
The utility model discloses an assembly method, including following step:
step one, forming a test bench by the vibration isolator and a platform;
secondly, forming excitation output equipment by the excitation equipment, the power amplification equipment, the signal acquisition and processing equipment and the computer;
thirdly, fixing the passive dynamic vibration absorber to be tested on a test bench;
fourthly, mounting the displacement sensor on the displacement sensor fixing device, wherein the displacement sensor fixing device is not in contact with the test bed;
fifthly, mounting the acceleration sensor beside a mounting point of the passive dynamic vibration absorber to be tested;
sixthly, outputting sweep frequency excitation, wherein the sweep frequency range needs to cover the approximate frequency of the vibration absorber;
and seventhly, transmitting the input signal of the acceleration sensor and the output signal of the displacement sensor to a computer through signal acquisition and processing equipment, and drawing the transmission rate from the acceleration signal to the displacement signal through test software, wherein the peak value is the natural frequency.
The above description is only the preferred embodiment of the present invention. Of course, the present invention can have other embodiments, and any person skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention. All technical solutions formed by equivalent substitutions or equivalent changes should fall within the protection scope of the appended claims.
Claims (6)
1. The utility model provides a passive form dynamic vibration absorber natural frequency test and debugging device which characterized in that: the vibration isolator comprises a vibration isolator (1), a platform (2), an excitation device (5), a power amplification device (6), a signal acquisition processing device (7), a computer (8), a displacement sensor fixing device (9), a displacement sensor (11) and an acceleration sensor (10), wherein the vibration isolator (1) and the platform (2) form a test bench, the excitation device (5) is installed on the test bench and is used for placing a passive dynamic vibration absorber (4) to be tested, the displacement sensor (11) is arranged at the top of the passive dynamic vibration absorber (4) to be tested and is fixed beside the test bench through the displacement sensor fixing device (9), the acceleration sensor (10) is installed on the test bench and is close to the passive dynamic vibration absorber (4) to be tested, the computer (8) is connected with the excitation device (5) through the signal acquisition processing device (7) and the power amplification device (6) and is used for outputting sweep excitation to the test bench, the displacement sensor (11) acquires displacement output acceleration output data of a vibrator of the passive dynamic vibration absorber to be tested, acquires acceleration input data of the passive dynamic vibration absorber to be tested, and transmits the acquired data to the acquisition processing device (8).
2. The passive dynamic vibration absorber natural frequency testing and tuning apparatus of claim 1 wherein: the platform (2) is a thick platform, and the natural frequency of the free mode 1 order is more than 2 times higher than the natural frequency of the vibration absorber to be tested.
3. The passive dynamic vibration absorber natural frequency testing and tuning apparatus of claim 1 wherein: the vertical natural frequency of the test bed is not more than 10Hz.
4. The passive dynamic vibration absorber natural frequency testing and tuning apparatus of claim 1, wherein: the excitation device (5) is mounted in a fixed manner, a suspended manner or a push rod manner.
5. The passive dynamic vibration absorber natural frequency testing and tuning apparatus of claim 1 wherein: the displacement sensor fixing device (9) is fixed beside the test bed and is not contacted with any part of the test bed.
6. The passive dynamic vibration absorber natural frequency testing and tuning apparatus of claim 1 wherein: and the computer determines the natural frequency of the vibration absorber according to the peak value of the transfer rate from the acceleration input data to the displacement output data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759166.4U CN218444386U (en) | 2022-10-19 | 2022-10-19 | Passive dynamic vibration absorber natural frequency testing and debugging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759166.4U CN218444386U (en) | 2022-10-19 | 2022-10-19 | Passive dynamic vibration absorber natural frequency testing and debugging device |
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| Publication Number | Publication Date |
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| CN218444386U true CN218444386U (en) | 2023-02-03 |
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| CN202222759166.4U Active CN218444386U (en) | 2022-10-19 | 2022-10-19 | Passive dynamic vibration absorber natural frequency testing and debugging device |
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- 2022-10-19 CN CN202222759166.4U patent/CN218444386U/en active Active
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