CN112780929A - Vibration sensor mounting structure - Google Patents
Vibration sensor mounting structure Download PDFInfo
- Publication number
- CN112780929A CN112780929A CN202010129937.4A CN202010129937A CN112780929A CN 112780929 A CN112780929 A CN 112780929A CN 202010129937 A CN202010129937 A CN 202010129937A CN 112780929 A CN112780929 A CN 112780929A
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- Prior art keywords
- mounting structure
- machine
- mounting
- sensor
- millimeters
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- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
- F16M13/022—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle repositionable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
A vibration sensor mounting structure improves the stability and repeatability of measurement signals generated by a machine vibration sensor. The structure has an outer annular surface for contacting a machine under test and a shallow recess in the outer annular surface. The recess causes resonant vibration of the mounting structure to occur at a frequency higher than the expected measurement range of the sensor. The recess also allows for positioning of the mounting force away from the central mounting screw and on the more stable outer annular surface. Since the mounting force is far from the center, the lateral force has less influence on the measurement signal.
Description
RELATED APPLICATIONS
The present application claims priority from U.S. provisional patent application serial No. 62/931,247 entitled "structure for providing sensor mounting stability and resonant frequency adjustment" filed on 6.11.2019 and U.S. non-provisional patent application serial No. 16/782,764 entitled "vibration sensor mounting structure" filed on 5.2.2020, the entire contents of which are incorporated herein by reference.
Technical Field
Embodiments of the invention described herein relate to the field of machine vibration sensing and monitoring. More particularly, embodiments relate to a structure for securely and stably mounting a vibration sensor to a machine surface and for adjusting a resonant frequency of the structure based at least in part on an area and geometry of a contact surface.
Background
Generally, a high quality vibration sensor should have a high frequency response. It is also important that any resonant vibration of the sensor structure should occur at a frequency outside the desired frequency range for the sensor to acquire data, and that the frequency response of the sensor should be repeatable from unit to unit.
Accordingly, there is a need for a robust and stable sensor mounting structure having a known and repeatable contact area with a machine surface.
Disclosure of Invention
The above and other needs are met by a vibration sensor mounting structure having a shallow recess in a central region of a surface of the structure in contact with a machine under test, which improves stability and repeatability of measurement signals generated by the vibration sensor. The recess causes resonant vibration of the mounting structure to occur at a frequency higher than the expected measurement range of the sensor. The recess also allows for positioning of the mounting force away from the central mounting screw and on the more stable outer annular surface. Since the mounting force is arranged away from the center, the influence of the lateral force on the measurement signal is small.
In some preferred embodiments, the vibration sensor mounting structure includes: a sensor attachment portion for accommodating and securely fixing the vibration sensor; and a base portion rigidly connected to the sensor attachment portion. The base portion includes an annular mounting surface and a central recessed surface. The annular mounting surface is configured to contact a surface of a machine and has an outer radius R and an inner radius R. The central recessed surface surrounded by the annular mounting surface is configured to not contact a machine surface. The values of the inner radius R and the outer radius R are selected to have a predetermined effect on the resonant frequency response of the mounting structure.
In some embodiments, the values of the inner radius R and the outer radius R are selected such that the resonant frequency response of the mounting structure is outside a measurement frequency range in which the vibration sensor is to measure the vibration of the machine.
In some embodiments, the inner radius R is greater than or equal to 71% and less than or equal to 75% of the outer radius R.
In some embodiments, the vibration sensor is for measuring vibration of the machine at a measurement frequency in the range of 1Hz to 10KHz, and the mass of the vibration sensor ranges from about 0.65 pounds to about 0.75 pounds, and the outer radius R ranges from 12.3 millimeters to 12.5 millimeters, and the inner radius R ranges from 8.9 millimeters to 9.1 millimeters.
In some embodiments, the outer radius R is 12.4 millimeters and the inner radius R is 9.0 millimeters.
In some embodiments, the sensor attachment portion and the base portion are integrally formed as one continuous structure.
Some embodiments include a central hole through the base portion for receiving a bolt or stud for attaching the mounting structure to a surface of the machine.
In some embodiments, the radius of the central bore is less than the inner radius r of the annular mounting surface.
In some embodiments, the annular mounting surface is substantially flat.
In some embodiments, the annular mounting surface is defined as part of a surface of an annulus.
In some embodiments, the central recessed surface is recessed relative to the annular mounting surface to a depth in the range of 0.2 millimeters to 0.4 millimeters.
In some embodiments, the central recessed surface is recessed to a depth of 0.3 millimeters relative to the annular mounting surface.
Drawings
Other embodiments of the invention will become apparent by reference to the detailed description when considered in conjunction with the drawings, wherein the elements are not drawn to scale so as to more clearly show the details, and wherein like reference numerals refer to like elements throughout the several views, and wherein:
FIG. 1 illustrates a prior art sensor mounting structure;
FIG. 2A is a top view of a sensor mounting structure according to one embodiment;
FIG. 2B is a cross-sectional view of the sensor mounting structure shown in FIG. 2A;
FIG. 2C is a bottom view of the sensor mounting structure shown in FIGS. 2A and 2B; and
fig. 3 shows a spectral plot of the frequency response of the mounting structure shown in fig. 1 and 2A-2C.
Detailed Description
As shown in fig. 1, the prior art sensor mounting structure has a generally flat circular surface surrounding a central bore that receives a threaded mounting/stud. In the example of prior art construction shown, the outer diameter of the mounting surface is about 24.8 mm, while the diameter of the central bore is about 6.5 mm. With this arrangement, the mounting surface of the prior art structure is of area A1A1 is represented as:
A1＝π(R2–r1 2),
wherein R is the outer radius of the ring, R1Is the inner radius of the ring. In the prior art structure, R is 12.4 mm, R1Is 3.25 mm, giving an area A1About 449.86 square millimeters.
As shown in fig. 2A, 2B and 2C, the preferred sensor mounting structure 10 includes a substantially circular sensor attachment portion 16 and a substantially circular base portion 18, which are preferably integrally formed from a single piece of metal. The sensor attachment portion 16 may include external threads that receive internal threads of a cylindrical sensor housing that is threaded onto the sensor mounting structure 10. In a preferred embodiment, the base portion 18 has a central bore 20 that receives a threaded mounting bolt/stud for attaching the structure 10 to a surface of a machine.
The base portion 18 preferably includes an annular mounting surface 12, the annular mounting surface 12 contacting the machineOf (2) is provided. The mounting surface 12 surrounds a central circular recessed area 14, which recessed area 14 preferably does not contact the surface of the machine. In a preferred embodiment, the recessed area 14 has a depth d of about 0.3 millimeters relative to the surface 12. The diameter of the recessed area 14 of the embodiment shown in fig. 2A-2C is about 18.0 millimeters. Thus, the mounting surface 12 of the embodiment shown in FIGS. 2A-2C is of area A2Ring of (A)2Expressed as:
A2＝π(R2–r2 2),
wherein R is 12.4 mm, R2Was 9.0 mm, giving an area A2228.58 square millimeters.
Fig. 3 is a comparison of the vibration level of a machine measured by a sensor attached to the machine using the prior art mounting structure shown in fig. 1 with the vibration level measured by the same sensor attached to the same machine using the preferred mounting structure 10 shown in fig. 2A-2C. As shown in fig. 3, the vibration levels measured with the prior art sensor mounting structure exhibited resonance peaks in the vicinity of 8500Hz, 9400Hz, and 10600 Hz. Since the energy associated with these peaks falls within the desired sensor measurement range of 1Hz to 10KHz, they can undesirably interfere with the vibration data acquisition on the machine under test. On the other hand, the resonant response of the mounting structure 10 shown in FIGS. 2A-2C exhibits a significant peak at about 17KHz, which is well outside the desired sensor measurement range.
It will be appreciated that the annular mounting surface 12 shown in fig. 2A-2C is merely one example of a preferred configuration. Other embodiments of the sensor mounting structure may have other outer and inner radii R, R2The value of (c). These dimensions may vary from sensor to sensor depending on the mass of the sensor, the natural resonant frequency of the sensor, and the expected operating frequency range of the machine under test. In general, R and R2Should be as large as possible to improve the overall stability of the structure.
It will be appreciated that embodiments of the present invention provide a robust and stable sensor mounting structure that prevents the sensor from detecting unwanted movement and vibration of the mounting structure. Due to the circular recess 14 in the middle of the base of the mounting structure, the mounting force is transferred to the outer annular surface 12. In this configuration, the sensor is less likely to be affected by flexible mounting conditions or by lateral forces due to manufacturing irregularities and tolerances.
In a preferred embodiment, the annular mounting surface 12 is substantially flat to within ± 0.01 millimeters. However, in an alternative embodiment, the annular mounting surface 12 is defined as part of the surface of a torus, in which case the points at which the surface of the torus contacts the surface of the machine substantially define a circle.
The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments were chosen and described in an effort to provide the best illustrations of the principles of the invention and its practical application, and to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally and equitably entitled.
Claims (20)
1. A mounting structure for contacting a surface of a machine and fixing a vibration sensor with respect to the machine when vibration of the machine is measured by the vibration sensor, the mounting structure comprising:
a sensor attachment portion for accommodating and securely fixing the vibration sensor;
a base portion rigidly connected to the sensor attachment portion, the base portion comprising:
an annular mounting surface configured to contact the surface of the machine, the annular mounting surface having an outer radius R and an inner radius R; and
a central recessed surface surrounded by the annular mounting surface, the central recessed surface configured to not contact the surface of the machine,
wherein the values of the inner radius R and the outer radius R are selected to have a predetermined effect on the resonant frequency response of the mounting structure.
2. The mounting structure of claim 1, wherein values of the inner radius R and the outer radius R are selected to cause the resonant frequency response of the mounting structure to be outside a measurement frequency range, wherein the vibration sensor is to measure vibrations of the machine within the measurement frequency range.
3. The mounting structure of claim 1, wherein the inner radius R is greater than or equal to 71% and less than or equal to 75% of the outer radius R.
4. The mounting structure of claim 1, wherein the vibration sensor is for measuring vibration of the machine at a measurement frequency in the range of 1Hz to 10KHz, and wherein the mass of the vibration sensor ranges from about 0.65 pounds to about 0.75 pounds, and wherein the outer radius R ranges from 12.3 millimeters to 12.5 millimeters, and the inner radius R ranges from 8.9 millimeters to 9.1 millimeters.
5. The mounting structure according to claim 1, wherein the outer radius R is 12.4 mm and the inner radius R is 9.0 mm.
6. The mounting structure of claim 1, wherein the sensor attachment portion and the base portion are integrally formed as one continuous structure.
7. The mounting structure of claim 1, further comprising a central hole through the base portion for receiving a bolt or stud for attaching the mounting structure to the surface of the machine.
8. The mounting structure of claim 7, wherein the central bore has a radius that is less than the inner radius r of the annular mounting surface.
9. The mounting structure of claim 1, wherein the annular mounting surface is substantially flat.
10. The mounting structure of claim 1, wherein the annular mounting surface is defined as part of a surface of an annulus.
11. The mounting structure of claim 1, wherein the central recessed surface is recessed relative to the annular mounting surface to a depth in the range of 0.2 millimeters to 0.4 millimeters.
12. The mounting structure of claim 1, wherein the mid-recessed surface is recessed to a depth of 0.3 millimeters relative to the annular mounting surface.
13. A mounting structure for contacting a surface of a machine and fixing a vibration sensor with respect to the machine when vibration of the machine is measured by the vibration sensor, the mounting structure comprising:
a sensor attachment portion for accommodating and securely fixing the vibration sensor;
a base portion rigidly connected to the sensor attachment portion, the base portion comprising:
an annular mounting surface configured to contact the surface of the machine, the annular mounting surface having an outer radius R and an inner radius R;
a central recessed surface surrounded by the annular mounting surface, the central recessed surface being recessed relative to the annular mounting surface to a depth in a range of 0.2 millimeters to 0.4 millimeters; and
a central bore through the base portion for receiving a bolt or stud for attaching the mounting structure to the surface of the machine,
wherein the inner radius R has a value selected from the range of 8.9 mm to 9.1 mm and the outer radius R has a value selected from the range of 12.3 mm to 12.5 mm such that the resonant frequency response of the mounting structure is higher than a measurement frequency range in which the vibration sensor is used to measure vibrations of the machine.
14. The mounting structure of claim 13, wherein the inner radius R is greater than or equal to 71% and less than or equal to 75% of the outer radius R.
15. The mounting structure of claim 13, wherein the outer radius R is 12.4 mm and the inner radius R is 9.0 mm.
16. The mounting structure of claim 13, wherein the sensor attachment portion and the base portion are integrally formed as one continuous structure.
17. The mounting structure of claim 13, wherein the central bore has a radius that is less than the inner radius r of the annular mounting surface.
18. The mounting structure of claim 13, wherein the annular mounting surface is substantially flat.
19. The mounting structure of claim 13, wherein the annular mounting surface is defined as part of a surface of an annulus.
20. The mounting structure of claim 13, wherein the mid-recessed surface is recessed to a depth of 0.3 millimeters relative to the annular mounting surface.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201962931247P | 2019-11-06 | 2019-11-06 | |
| US62/931,247 | 2019-11-06 | ||
| US16/782,764 US11226229B2 (en) | 2019-11-06 | 2020-02-05 | Vibration sensor mounting structure |
| US16/782,764 | 2020-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112780929A true CN112780929A (en) | 2021-05-11 |
| CN112780929B CN112780929B (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010129937.4A Active CN112780929B (en) | 2019-11-06 | 2020-02-28 | Vibration sensor mounting structure |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101059367A (en) * | 2006-04-19 | 2007-10-24 | 株式会社电装 | Vibration sensor and vibration detection method |
| US20110203367A1 (en) * | 2009-10-21 | 2011-08-25 | Micropoint Bioscience Inc. | Piezoelectric coagulation sensors |
| CN103154721A (en) * | 2010-09-03 | 2013-06-12 | 洛斯阿拉莫斯国家安全股份有限公司 | Apparatus and method for noninvasive particle detection using Doppler spectroscopy |
| US20150355216A1 (en) * | 2014-06-10 | 2015-12-10 | Uptime Solutions, Inc. | Vibration-sensing field unit |
| CN106768259A (en) * | 2016-12-19 | 2017-05-31 | 北京强度环境研究所 | A kind of vibrating sensor subtracts flushing device and preparation method thereof |
| US20180292243A1 (en) * | 2017-04-10 | 2018-10-11 | Itt Manufacturing Enterprises Llc | Exact Constraint Three-Point Vibration Sensing Module |
-
2020
- 2020-02-28 CN CN202010129937.4A patent/CN112780929B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101059367A (en) * | 2006-04-19 | 2007-10-24 | 株式会社电装 | Vibration sensor and vibration detection method |
| US20110203367A1 (en) * | 2009-10-21 | 2011-08-25 | Micropoint Bioscience Inc. | Piezoelectric coagulation sensors |
| CN103154721A (en) * | 2010-09-03 | 2013-06-12 | 洛斯阿拉莫斯国家安全股份有限公司 | Apparatus and method for noninvasive particle detection using Doppler spectroscopy |
| US20150355216A1 (en) * | 2014-06-10 | 2015-12-10 | Uptime Solutions, Inc. | Vibration-sensing field unit |
| CN106768259A (en) * | 2016-12-19 | 2017-05-31 | 北京强度环境研究所 | A kind of vibrating sensor subtracts flushing device and preparation method thereof |
| US20180292243A1 (en) * | 2017-04-10 | 2018-10-11 | Itt Manufacturing Enterprises Llc | Exact Constraint Three-Point Vibration Sensing Module |
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| CN112780929B (en) | 2022-09-27 |
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