CN212391110U - Vibration sensor base with high-frequency measurement upper limit - Google Patents
Vibration sensor base with high-frequency measurement upper limit Download PDFInfo
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- CN212391110U CN212391110U CN202021417551.5U CN202021417551U CN212391110U CN 212391110 U CN212391110 U CN 212391110U CN 202021417551 U CN202021417551 U CN 202021417551U CN 212391110 U CN212391110 U CN 212391110U
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Abstract
The utility model discloses a vibration sensor base with high frequency measurement upper limit, which comprises a base body and a metal damping coating, wherein the lower mounting surface of the base body comprises a first base mounting surface and a second base mounting surface, an annular groove is arranged between the first base mounting surface and the second base mounting surface, and the first base mounting surface protrudes out of the second base mounting surface; and a metal damping coating is arranged in the annular groove. The utility model discloses a setting up of first base installation face protrusion second base installation face improves the frequency and measures the upper limit, and the damping action through the metal damping coating suppresses near the amplitude of low order resonance point, especially suppresses the resonance of second base installation face and transmits to first base installation face, reduces the vibration measurement error, desensitization error.
Description
Technical Field
The utility model belongs to the technical field of vibration monitoring devices, concretely relates to vibration sensor base of upper limit is measured to high frequency.
Background
The piezoelectric vibration sensor with the high-frequency measurement upper limit plays an important role in some special application fields (such as nuclear industry), and is mainly used for fault diagnosis of key equipment. The vibration sensor with the high frequency measurement upper limit mainly comprises a sensor base, a piezoelectric sensing core body and a shell, wherein the piezoelectric sensing core body and the shell are respectively fixed on the sensor base. When the sensor is excited by external vibration, a vibration signal is transmitted to the piezoelectric sensing core body by the sensor base, and the piezoelectric sensing core body generates a corresponding output signal through a piezoelectric effect. In the effective frequency response range of the vibration sensor base, the vibration signal measured outside can be accurately transmitted to the piezoelectric sensing core body, and vibration measurement is realized.
However, since the upper frequency response limit of the sensor base is often limited by the low installation resonant frequency, the upper limit of the vibration frequency which can be accurately measured by the vibration sensor is not high. It is known that the upper limit of the frequency of the current domestic industrial vibration sensor is mostly 8000Hz or less (the sensitivity error is 10% or less), and the sensitivity error in the frequency band of 8000Hz to 10000Hz can be significantly larger to 30% or more. At present, the fault characteristic frequency of key equipment in the special industrial field can reach 10000Hz, so the health diagnosis system based on vibration monitoring requires that the upper frequency limit of the vibration sensor which can be accurately measured is more than or equal to 10000 Hz. Under the circumstance, how to reduce the high-frequency measurement error of the high-temperature-resistant piezoelectric vibration sensor so as to meet the application requirement of special industry is a problem to be solved urgently at present.
In the industry, at present, a method for reducing the roughness of a mounting surface of a base of a vibration sensor is almost adopted, and the mounting resonant frequency of the vibration sensor is increased to a higher frequency so as to obtain a piezoelectric vibration sensor with a higher upper limit of frequency measurement. However, experience has shown that the effect of raising the upper limit of the frequency response by merely reducing the roughness of the mount surface of the base of the vibration sensor is limited, and the upper limit of the frequency measurement of the vibration sensor cannot be raised significantly.
Theoretically speaking, through the structural design of the special vibration sensor base, the installation pretightening force of the vibration sensor base is improved, the installation resonant frequency of the vibration sensor can be improved, and finally the piezoelectric vibration sensor with higher frequency measurement upper limit is obtained. However, no research work in this area has been reported. Meanwhile, theoretically, the damping can inhibit the resonance near the installation resonant frequency of the vibration sensor, and the piezoelectric vibration sensor with higher high-frequency measurement precision can be obtained by arranging the damping on the base of the vibration sensor. However, no research work in this area has been reported yet.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a vibration sensor base of upper limit is measured to high frequency, through the setting of first base installation face protrusion second base installation face improve the frequency and measure the upper limit, through the damping action suppression low order resonance point near amplitude of metal damping coating, especially restrain the resonance of second base installation face and transmit to first base installation face, reduce the vibration measurement error, desensitization error.
The utility model discloses mainly realize through following technical scheme: a vibration sensor base with a high frequency measurement upper limit comprises a base body and a metal damping coating, wherein a mounting surface below the base body comprises a first base mounting surface and a second base mounting surface, an annular groove is formed between the first base mounting surface and the second base mounting surface, and the first base mounting surface protrudes out of the second base mounting surface; and a metal damping coating is arranged in the annular groove.
In order to realize better the utility model discloses, it is further, the base member passes through mounting screw to be installed on the surface of testee, and the part of first installation face protrusion second installation face because of receiving the extrusion force shrink disappearance, and finally first installation face flushes the setting with the second installation face.
In order to better realize the utility model, furthermore, be provided with 3 mounting screw holes on the base member, and the aperture scope is 3mm-6 mm.
In order to better realize the utility model, furthermore, the size H of the first base installation surface protruding the second base installation surface is 0.001mm-2 mm.
In order to better realize the utility model, further, the width scope of annular slot is 0.5mm-3 mm.
In order to better realize the utility model, further, the base body is made of nickel-based alloy material, and the metal damping coating is made of NiCrAlY or magnesium alloy.
According to the mechanical theory, assuming that the dimension of the protrusion of the first base mounting surface relative to the second base mounting surface is H, and k is the shrinkage stiffness coefficient of the first base mounting surface, the shrinkage of the protrusion causes the first base mounting surface to be subjected to an additional pre-tightening force k × H. Therefore, the utility model discloses make first pedestal mounting face receive bigger pretightning force, installation face contact rigidity increases thereupon, can improve vibration sensor pedestal mounting resonant frequency, finally obtains higher frequency and measures the upper limit.
When the measured vibration frequency omega approaches the vibration sensor base mounting resonance frequency omeganWhen this occurs, resonance occurs. Assuming the damping coefficient ζ of the base body itself0The damping coefficient of the metal damping coating is zeta1The damping of the vibration sensor base is ζ ═ ζ0+ζ1. According to a second-order system amplitude-frequency characteristic formula:
increasing the relative damping coefficient ζ suppresses the amplitude a (ω) near the resonance point. Therefore, the damping effect of the metal damping coating can inhibit the amplitude near the low-order resonance point and reduce the vibration measurement error, thereby achieving the effect of further inhibiting the high-frequency measurement error of the vibration sensor. Particularly, the second base mounting surface has no additional pretightening force, the mounting resonance frequency of the second base mounting surface is lower than that of the first base mounting surface, the metal damping coating is positioned in the annular groove between the first base mounting surface and the second base mounting surface, the resonance of the second base mounting surface can be inhibited from being transmitted to the first base mounting surface, and the first base mounting surface is ensured to accurately transmit the high-frequency vibration signal on the surface of the object to be measured.
The utility model has the advantages that:
(1) the utility model discloses a setting up of first base installation face protrusion second base installation face improves the frequency and measures the upper limit, and the damping action through the metal damping coating suppresses near the amplitude of low order resonance point, especially suppresses the resonance of second base installation face and transmits to first base installation face, reduces the vibration measurement error, desensitization error.
(2) High frequency response: the utility model discloses divide into two regions with the below installation face of base member: a first base mounting surface and a second base mounting surface. The protruding size range of the first base mounting surface relative to the second base mounting surface is about 0.001mm to 2mm, so that the first base mounting surface can obtain additional pretightening force, and the upper limit of frequency measurement can reach 10000 Hz.
(3) Low error: the metal damping coating can enable the vibration sensor base to obtain additional damping, the damping effect of the metal damping coating can inhibit the vibration amplitude near a low-order resonance point, particularly inhibit the resonance of the second base mounting surface from being transmitted to the first base mounting surface, reduce vibration measurement errors, and control the sensitivity errors to be below 15%.
(4) High temperature resistance and irradiation resistance: the base body of the utility model is made of nickel-based alloy material which can resist high temperature above 500 ℃. The metal damping coating adopts NiCrAlY or magnesium alloy, and the material can resist high temperature up to 482 ℃. Meanwhile, the nickel-based alloy material adopted by the base substrate and the NiCrAlY or magnesium alloy adopted by the metal damping coating are both inorganic materials, and the irradiation resistant dose can reach 1000000 Gy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an enlarged view of area B of FIG. 2;
FIG. 4 is a schematic view of a connection structure of the mounting base and the housing;
fig. 5 is an operational view of the mounting base.
Wherein: the method comprises the following steps of 1-base matrix, 2-metal damping coating, 3-piezoelectric sensing core, 4-shell, 5-mounting screw, 6-measured object, 7-first base mounting surface, 8-second base mounting surface, 9-annular groove and 10-mounting screw hole.
Detailed Description
Example 1:
a vibration sensor base with a high frequency measurement upper limit comprises a base body 1 and a metal damping coating 2, wherein a mounting surface below the base body 1 comprises a first base mounting surface 7 and a second base mounting surface 8, an annular groove 9 is formed between the first base mounting surface 7 and the second base mounting surface 8, and the first base mounting surface 7 protrudes out of the second base mounting surface 8; and a metal damping coating 2 is arranged in the annular groove 9.
The utility model discloses a setting up of 7 salient second base installation faces 8 of first base installation face improves the frequency and measures the upper limit, and the damping action through metal damping coating 2 suppresses near the amplitude of low order resonance point, especially suppresses the resonance of second base installation face 8 and transmits to first base installation face 7, reduces the vibration measurement error, desensitization error.
Example 2:
the embodiment is optimized on the basis of embodiment 1, the base body 1 is installed on the surface of a measured object 6 through an installation screw 5, the part of the first installation surface, which protrudes out of the second installation surface, shrinks and disappears due to the compression force, and finally the first installation surface and the second installation surface are arranged in a flush mode. The base body 1 is provided with 3 mounting screw holes 10, and the aperture range is 3mm-6 mm.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
the embodiment is optimized based on embodiment 1 or 2, and as shown in fig. 3, the dimension H of the first base mounting surface 7 protruding the second base mounting surface 8 is 0.001mm-2 mm. The width of the annular groove 9 ranges from 0.5mm to 3 mm.
The utility model discloses divide into two regions with the below installation face of base member 1: a first base mounting surface 7 and a second base mounting surface 8. The protruding size range of the first base mounting surface 7 relative to the second base mounting surface 8 is about 0.001mm to 2mm, so that the first base mounting surface 7 can obtain additional pretightening force, and the upper limit of frequency measurement can reach 10000 Hz.
The metal damping coating 2 can enable the vibration sensor base to obtain additional damping, the damping effect of the metal damping coating 2 can inhibit the vibration amplitude near a low-order resonance point, particularly can inhibit the resonance of the second base mounting surface 8 from being transmitted to the first base mounting surface 7, vibration measurement errors are reduced, and the sensitivity errors can be controlled to be below 15%.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
a vibration sensor base with a high frequency measurement upper limit comprises a base body 1 and a metal damping coating 2, wherein a mounting surface below the base body 1 comprises a first base mounting surface 7 and a second base mounting surface 8, an annular groove 9 is formed between the first base mounting surface 7 and the second base mounting surface 8, and the first base mounting surface 7 protrudes out of the second base mounting surface 8; and a metal damping coating 2 is arranged in the annular groove 9.
As shown in fig. 4, the piezoelectric vibration sensor includes a sensor base, a piezoelectric sensed core body 3, and a housing 4. Firstly, the piezoelectric sensing core body 3 is arranged on the upper surface of the base body 1, the piezoelectric sensing core body 3 is coaxial with the first base mounting surface 7, and the outline of the piezoelectric sensing core body 3 does not exceed the axial projection range of the first base mounting surface 7. Then the shell 4 is arranged on the upper surface of the base matrix 1 and covers the piezoelectric sensing core body 3, so that the piezoelectric vibration sensor with high-rate measurement upper limit is realized, the frequency measurement upper limit can reach 10000Hz, and the sensitivity error can be controlled below 15%.
As shown in fig. 5, the piezoelectric vibration sensor is fixed to the object to be measured by a mounting screw 5. When the base body 1 is mounted and fastened on the object to be measured 6 through three screws, the protruding portion of the first base mounting surface 7 relative to the second base mounting surface 8 shrinks until disappearing due to extrusion force, and finally the first base mounting surface 7 is flush with the second base mounting surface 8. According to the mechanical theory, assuming that k is the shrinkage stiffness coefficient of the first base mounting surface 7 and the dimension of the protrusion of the first base mounting surface 7 relative to the second base mounting surface 8 is H, the shrinkage of the protrusion causes the first base mounting surface 7 to be subjected to an additional pre-tightening force k × H. Therefore, the utility model discloses make first pedestal mounting face 7 receive bigger pretightning force, installation face contact rigidity increases thereupon, can improve vibration sensor pedestal mounting resonant frequency, finally obtains higher frequency and measures the upper limit, and the frequency is measured the upper limit and can reach 10000 Hz.
The metal damping coating 2 can enable the vibration sensor base to obtain additional damping, the damping effect of the metal damping coating 2 can inhibit the vibration amplitude near a low-order resonance point, particularly can inhibit the resonance of the second base mounting surface 8 from being transmitted to the first base mounting surface 7, vibration measurement errors are reduced, and the sensitivity errors can be controlled to be below 15%.
The utility model discloses a setting up of 7 salient second base installation faces 8 of first base installation face improves the frequency and measures the upper limit, and the damping action through metal damping coating 2 suppresses near the amplitude of low order resonance point, especially suppresses the resonance of second base installation face 8 and transmits to first base installation face 7, reduces the vibration measurement error, desensitization error.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (6)
1. The vibration sensor base with the high frequency measurement upper limit is characterized by comprising a base body (1) and a metal damping coating (2), wherein a mounting surface below the base body (1) comprises a first base mounting surface (7) and a second base mounting surface (8), an annular groove (9) is formed between the first base mounting surface (7) and the second base mounting surface (8), and the first base mounting surface (7) protrudes out of the second base mounting surface (8); and a metal damping coating (2) is arranged in the annular groove (9).
2. The vibration sensor base with the high frequency measurement upper limit as claimed in claim 1, wherein the base body (1) is mounted on the surface of the object to be measured (6) through mounting screws (5), and the portion of the first mounting surface protruding out of the second mounting surface shrinks and disappears due to the compression force, and finally the first mounting surface and the second mounting surface are arranged in a flush manner.
3. The vibrating sensor base with the high frequency measurement upper limit according to claim 2, characterized in that the base body (1) is provided with 3 mounting screw holes (10) with a hole diameter ranging from 3mm to 6 mm.
4. A vibration sensor mount with an upper limit of high frequency measurement according to claim 1, characterized in that the dimension H of the first mount mounting surface (7) protruding beyond the second mount mounting surface (8) is 0.001mm-2 mm.
5. A vibrating sensor mount with an upper limit of high frequency measurement according to claim 1, characterized in that the width of the annular groove (9) ranges from 0.5mm to 3 mm.
6. A vibration sensor mount with an upper limit of high frequency measurement according to any of claims 1-5, characterized in that the mount base body (1) is made of a nickel based alloy material and the metallic damping coating (2) is made of NiCrAlY or a magnesium alloy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021417551.5U CN212391110U (en) | 2020-07-17 | 2020-07-17 | Vibration sensor base with high-frequency measurement upper limit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021417551.5U CN212391110U (en) | 2020-07-17 | 2020-07-17 | Vibration sensor base with high-frequency measurement upper limit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947768A (en) * | 2020-07-17 | 2020-11-17 | 成都凯天电子股份有限公司 | Vibration sensor base with high-frequency measurement upper limit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947768A (en) * | 2020-07-17 | 2020-11-17 | 成都凯天电子股份有限公司 | Vibration sensor base with high-frequency measurement upper limit |
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