CN110108410B - Pressure sensor mounting structure under high impact acceleration background condition - Google Patents
Pressure sensor mounting structure under high impact acceleration background condition Download PDFInfo
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- CN110108410B CN110108410B CN201910383888.4A CN201910383888A CN110108410B CN 110108410 B CN110108410 B CN 110108410B CN 201910383888 A CN201910383888 A CN 201910383888A CN 110108410 B CN110108410 B CN 110108410B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/02—Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/26—Details or accessories
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Abstract
The invention discloses a pressure sensor mounting structure under a high impact acceleration background condition, which comprises an inner mounting seat 1, a vibration isolator 2, an outer mounting seat 3, a compression screw 4 and a fixing screw 5. Interior mount pad 1 is the variable cross section cylinder, has the sensor mounting hole in, and interior mount pad 1 outwards installs isolator 2 and outer mount pad 3 in proper order, and the three is fixed as an organic whole through the restraint of housing screw 4, and the housing screw 5 is fixed with outer mount pad 3 and surveyed the structural connection. The vibration isolator has the advantages that the vibration isolator 2 is a funnel-shaped thin cylinder, the contact area of the inner mounting seat 1 and the outer mounting seat 3 is increased, the vibration propagation distance is increased under the condition of equal gap width, the acceleration transmitted by the outer mounting seat 3 can be decomposed to the tangential direction and the normal direction of the vibration isolator 2, the vibration energy transmitted by the outer mounting seat is effectively absorbed and decomposed, the acceleration parasitic effect of the pressure sensor in the inner mounting seat 1 is inhibited, and more accurate pressure load is obtained.
Description
The invention belongs to the technical field of damage testing, and particularly relates to a sensor mounting structure, in particular to a pressure sensor mounting structure under the background condition of high impact acceleration.
Background
The piezoelectric sensor has an acceleration effect, that is, when a pressed diaphragm of the pressure sensor is subjected to acceleration, the diaphragm deforms under the action of inertia force to press the piezoelectric wafer, and the sensor outputs a charge signal, which can be called an acceleration parasitic signal. Therefore, the signal output by the pressure sensor includes both the pressure signal and the acceleration parasitic signal. In order to obtain the pressure load accurately, the acceleration parasitic signals must be eliminated as much as possible. The elimination method mainly comprises two methods, namely a signal processing method for eliminating the acceleration parasitic signal in the obtained pressure signal according to the acceleration response characteristic of the sensor, and an isolation vibration method for controlling the acceleration parasitic signal of the sensor within an acceptable range by designing the vibration of an isolation structure through a mounting structure with vibration isolation measures.
The sheet structure can generate high-frequency vibration under the action of strong shock waves, acceleration parasitic signals of a pressure sensor arranged on the sheet structure cannot be ignored, the vibration modes and the intensities of sheets with different rigidity and constraint intensity under the shock wave impact action of different intensities are different, the difficulty is high in the signal processing method, the accuracy of the result is difficult to guarantee, and therefore the most effective and concise method for eliminating the acceleration parasitic signals is an isolation vibration method.
The pressure sensor mounting assembly can be viewed as a two degree-of-freedom spring-mass system, and a significant source of sensor measurement assembly acceleration parasitics is the response to mounting base acceleration, which depends on the severity of the mounting base vibration and the magnitude of its acceleration value coupled to the mounting base. Under the condition of strong vibration of the structure to be measured, the measuring sensor assembly is caused to generate corresponding additional vibration which is coupled with the speed sensitivity of the measuring assembly of the sensor, so that the generated acceleration parasitic output can be controlled only by design.
The strong-vibration plate structure surface pressure load test working condition usually occurs in case structure internal explosion and plate/plate frame structure close-range explosion, the technical field is relatively narrow, the wide attention of the pressure test field is not caused, and no effective solution is found at present.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pressure sensor mounting structure under the background condition of high impact acceleration, which can effectively isolate the high-frequency vibration of a measured structure, control the response of the pressure sensor to the acceleration of the measured structure, eliminate the output of acceleration parasitic signals of the sensor and improve the measurement precision of the surface pressure load of the high-frequency vibration structure.
In order to realize the task, the invention adopts the following technical solution:
the utility model provides a pressure sensor mounting structure under high shock acceleration background condition, includes interior mount pad, isolator, outer mount pad, compresses tightly spiral shell, fixed spiral shell, wherein:
the inner mounting seat is a hollow body of a round table connecting cylinder, the length of the inner mounting seat is 0.3-0.5 mm shorter than the length from a pressure sensor sensitive surface to the starting position of a tail end test line mounting thread of the pressure sensor sensitive surface, so as to ensure the mounting allowance, the length of a round table part accounts for two thirds, the included angle between a round table bus and a rotating shaft is 10-30 degrees, two small blind holes are formed at the large end of the round table and are used as mounting bayonets, the small end of the round table is connected with the cylinder, a vibration isolator, an outer mounting seat and a fixing screw are sequentially mounted outwards on the round table part, a hollow hole inside the inner mounting seat is a sensor mounting hole, the sensor sensitive surface is located on the large end surface of the round table according to the matching of the pressure sensor, a sensor mounting thread is arranged inside the sensor mounting hole of the cylinder part from outside to inside and is used, the length of the compression thread is 1-2 mm shorter than that of the cylindrical part of the inner mounting seat;
the vibration isolator is of a structure that the funnel-shaped cylinder is connected with the circular ring pad and is made of a high-elasticity material, the funnel-shaped cylinder part is matched according to the circular platform part of the inner mounting seat, the circular ring pad part is connected with the small end of the funnel-shaped cylinder part, the inner diameter of the circular ring pad part is the same as the inner diameter of the small end of the funnel-shaped cylinder, the outer diameter of the circular ring pad part is the same as the outer diameter of the large end of the funnel-shaped cylinder, the funnel-shaped;
the outer mounting seat is a hollow cylinder, the length of the outer mounting seat is the same as that of the funnel-shaped cylinder part of the vibration isolator, the inner hollow hole is matched with the funnel-shaped cylinder part of the vibration isolator, and mounting threads are arranged on the outer surface of the column body of the outer mounting seat and used for fixedly mounting the mounting structure of the invention on a tested structure;
the compression screw is a hexagonal thin-wall nut, the thickness of the nut is the same as the length of the cylindrical part of the inner mounting seat, the thread is matched with the external thread of the cylindrical part of the inner mounting seat, and the diameter of the circumscribed circle of the nut is slightly smaller than the external diameter of the external mounting seat;
the fixing screw is a hexagonal thin-wall nut, and the thread is matched with the external thread of the external mounting seat.
The installation sequence of this mounting structure does: the large end of a high-elasticity vibration isolator is inwards squeezed and plugged into one end with a small diameter of a hollow hole in an outer mounting seat, so that the vibration isolator is completely attached to the inside of the outer mounting seat; secondly, penetrating one end of the inner mounting base cylinder into the large end of the vibration isolator; thirdly, the compression screw is matched with the inner mounting seat to be mounted, so that the inner mounting seat, the vibration isolator and the outer mounting seat are integrated; and fourthly, fixedly installing the outer installation seat on the tested structure by utilizing a fixing screw. After the installation is finished, the pressure sensor can be installed and the inner hole of the inner installation seat can be tested.
The pressure sensor mounting structure under the background condition of high impact acceleration can effectively inhibit the acceleration effect of the pressure sensor caused by the high-frequency vibration of the structure to be tested, thereby improving the testing precision of the pressure load and having the following beneficial effects.
(1) An inner mounting seat and an outer mounting seat are designed, and a high-elasticity vibration isolator is added between the inner mounting seat and the outer mounting seat, so that the wave impedance difference between the vibration isolator and the mounting seats is improved, the propagation of vibration is effectively blocked, the acceleration parasitic signals of the sensor are reduced, and the pressure load testing precision is improved;
(2) the contact surfaces of the inner and outer mounting seats and the vibration isolators form a certain angle with a rotating shaft of the mounting structure, so that the contact area of the structures with the same length is increased, the vibration propagation distance of the vibration isolators with the same thickness is increased, more vibration energy is absorbed by the vibration isolators, the acceleration parasitic signals of the sensor are reduced, and the pressure load testing precision is improved;
(3) the contact surfaces of the vibration isolator and the inner and outer mounting seats form a certain angle with the rotating shaft, acceleration transmitted to the sensor by the structure is decomposed to the tangential direction and the normal direction of the surface of the vibration isolator, the acceleration of the sensor in the axis direction and the plane of the mounting structure is reduced, the acceleration parasitic signal of the sensor is reduced, and the pressure load testing precision is improved.
Drawings
FIG. 1 is a schematic view of the pressure sensor mounting configuration of the present invention in a high shock acceleration background condition;
FIG. 2 is a schematic view of an inner mount of the present invention;
FIG. 3 is a schematic view of the insulator of the present invention;
FIG. 4 is a graph of the detonation pressure in a square detonation tank for 50g of TNT explosive using a non-vibration isolating mounting structure;
fig. 5 is a graph of the explosive pressure in a square explosion can for 50g of tnt explosive using the vibration isolation mounting structure of the present invention.
The reference numbers in the figures represent respectively: 1. 1-1 parts of inner mounting base, 1-2 parts of mounting bayonet, 1-3 parts of sensor mounting hole, 1-4 parts of sensor mounting thread, 2 parts of pressing thread, 3 parts of vibration isolator, 3 parts of outer mounting base, 4 parts of pressing screw, 5 parts of fixing screw.
Detailed Description
As shown in fig. 1, the pressure sensor mounting structure under the background condition of high impact acceleration in the present embodiment includes an inner mounting seat 1, an isolator 2, an outer mounting seat 3, a compression screw 4, and a fixing screw 5, wherein:
the inner mounting seat 1 is a hollow body of a circular truncated cone connecting cylinder, the length of the inner mounting seat is 0.3-0.5 mm shorter than the length from a sensitive surface of a pressure sensor to the initial position of a mounting thread of a tail end testing line of the inner mounting seat, so as to ensure the mounting allowance, the length of a circular truncated cone part accounts for two thirds, the included angle between a generatrix of the circular truncated cone and a rotating shaft is 10-30 degrees, the large end of the circular truncated cone is provided with two small blind holes as mounting bayonets 1-1, the small end of the circular truncated cone is connected with the cylinder, the circular truncated cone part is outwards and sequentially provided with a vibration isolator 2, an outer mounting seat 3 and a fixing screw 5, a hollow hole in the inner mounting seat 1 is a sensor mounting hole 1-2, the sensor mounting seat is matched according to the pressure sensor, so that the sensitive surface of the sensor is positioned on the large end surface of the circular truncated cone, the outer surface of the cylindrical part is provided with a pressing thread 1-4, and the length of the pressing thread 1-4 is 1-2 mm shorter than that of the cylindrical part of the inner mounting seat 1;
the vibration isolator 2 is of a funnel-shaped cylinder-connected circular ring pad structure and is made of a high-elasticity material, the funnel-shaped cylinder part is manufactured according to the circular platform part of the inner mounting seat 1, the circular ring pad part is connected with the small end of the funnel-shaped cylinder part, the inner diameter of the circular ring pad part is the same as the inner diameter of the small end of the funnel-shaped cylinder, the outer diameter of the circular ring pad part is the same as the outer diameter of the large end of the funnel-shaped cylinder, the thickness of the funnel-shaped cylinder;
the outer mounting seat 3 is a hollow cylinder, the length of the outer mounting seat is the same as that of the funnel-shaped cylinder part of the vibration isolator 2, the inner hollow hole is matched with the funnel-shaped cylinder part of the vibration isolator 2, and mounting threads are arranged on the outer surface of the cylinder body of the outer mounting seat 3 and used for fixedly mounting the mounting structure of the invention on a tested structure;
the compression screw 4 is a hexagonal thin-wall nut, the thickness of the nut is the same as the length of the cylindrical part of the inner mounting seat 1, threads are matched with the compression threads 1-4 of the cylindrical part of the inner mounting seat 1, and the diameter of the circumscribed circle of the nut is slightly smaller than the outer diameter of the outer mounting seat 3;
the fixing screw 5 is a hexagonal thin-wall nut, and the thread is matched with the external thread of the outer mounting seat 3.
The installation sequence of this mounting structure does: firstly, the large end of a high-elasticity vibration isolator 2 is inwards squeezed and plugged into one end with the small diameter of a hollow hole in an outer mounting seat 3, so that the vibration isolator 2 is completely attached to the interior of the outer mounting seat 3; secondly, penetrating one end of a cylinder of the inner mounting base 1 from the large end of the vibration isolator 2; thirdly, the compression screw 4 is matched with the inner mounting seat 1 to be mounted, so that the inner mounting seat 1, the vibration isolator 2 and the outer mounting seat 3 are integrated; and fourthly, fixedly installing the outer installation seat 3 in the tested structure by using a fixing screw 5, and then installing the pressure sensor in the inner hole of the inner installation seat 1.
The present invention is further described with reference to the following embodiments, it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present application fall within the protection scope of the present invention.
The embodiment designs the pressure sensor mounting structure suitable for the PCB113 series pressure sensor under the background condition of high impact acceleration. In the embodiment, the length of an inner mounting seat 1 is 28mm, the included angle between a generatrix of a circular truncated cone part and a rotating shaft is 10 degrees, the inner diameter of a mounting bayonet 1-1 is 1.5mm, the depth of the mounting bayonet is 1mm, a sensor mounting hole 1-2 is a stepped hole, the inner diameter of a small hole section of the circular truncated cone part is 5.6mm, the length of the small hole section is 6mm, the inner diameter of the other section is 6.35mm, a sensor mounting thread 1-3 is M7 multiplied by 0.75 and 12mm in length, and a compression thread 1-4 is M12 multiplied by 1.5; the vibration isolator 2 is made of natural rubber with the length of 19mm, the outer diameter of the large end of a funnel-shaped cylinder of the vibration isolator 2 is 20mm, the inner diameter of a circular pad of the vibration isolator 2 is 12mm, the thickness of the funnel-shaped cylinder is 2mm, and the thickness of the circular pad is 3 mm; the outer diameter of the outer mounting seat 3 is 25mm, and the outer surface thread is M25 multiplied by 1.5; the thickness of the compaction screw 4 is 9mm, and the diameter of the circumscribed circle is 23 mm; the thickness of the fixing screw 5 is 12mm, and the diameter of the circumcircle is 52 mm.
In order to verify the vibration isolation effect of the pressure sensor mounting structure under the background condition of high impact acceleration in the embodiment, the applicant adopts the rapid response explosion field shock wave overpressure filter and the non-vibration isolation mounting structure simultaneously, and the vibration isolation effect is realized at 1m3The square explosion tank is used for carrying out an explosion test of 50g of TNT explosive column, the shock wave pressure sensors are all 113A22 piezoelectric pressure sensors of American PCB company, fig. 4 is a shock wave overpressure curve obtained by a non-vibration isolation mounting structure, and fig. 5 is a shock wave overpressure curve obtained by the embodiment. It can be seen that the pressure peak in fig. 4 is about 7.3MPa and the positive pressure duration is about 0.6ms, but the curve shows multiple oscillations during the pressure decay process, and the negative pressure reaches even-10 MPa, which is not physically significant. The strong vibration of the wall surface of the explosion tank is not effectively isolated, the acceleration effect of the sensor is obvious, meanwhile, the strong vibration causes poor transient contact on a connecting contact pin between the sensor and a signal wire, so that the output voltage exceeds the measuring range. The pressure peak value of fig. 5 is about 7.0MPa, the positive pressure duration is about 0.6ms, the pressure curve is smooth and gradually changed, and strong discontinuity points do not appear, so that the vibration isolation effect of the pressure sensor mounting structure under the high impact acceleration background condition is remarkable, and the pressure load test precision of the surface of the strong vibration structure can be remarkably improved.
Claims (3)
1. The utility model provides a pressure sensor mounting structure under high shock acceleration background condition which characterized in that, includes interior mount pad (1), isolator (2), outer mount pad (3), compresses tightly spiral shell (4), fixed spiral shell (5), wherein:
the inner mounting seat (1) is a hollow body with a circular truncated cone connecting cylinder, the length of the circular truncated cone part accounts for two thirds, the circular truncated cone part is outwards provided with a vibration isolator (2), an outer mounting seat (3) and a fixing screw (5) in sequence, the large end of the circular truncated cone is provided with a blind hole as a mounting bayonet (1-1), the small end of the circular truncated cone is connected with the cylinder, the outer surface of the cylinder part is provided with a pressing thread (1-4) for mounting the pressing screw (4), a hollow hole in the inner mounting seat (1) is a sensor mounting hole (1-2), and the sensor mounting hole (1-2) of the cylinder part is provided with a sensor mounting thread (1-3) from outside;
the vibration isolator (2) is of a structure that the funnel-shaped cylinder is connected with a circular ring pad, the inner diameter of the funnel-shaped cylinder is the same as the outer diameter of the circular table part of the inner mounting seat (1), the circular ring pad part is connected with the small end of the funnel-shaped cylinder part, the inner diameter of the circular ring pad is the same as the inner diameter of the small end of the funnel-shaped cylinder, and the outer diameter of the circular ring pad is the same as the outer diameter of the large;
the outer mounting seat (3) is a hollow cylinder, the length of the outer mounting seat is the same as that of the funnel-shaped cylinder part of the vibration isolator (2), the inner diameter of the hollow hole is the same as that of the funnel-shaped cylinder part of the vibration isolator (2), and the outer surface of the outer mounting seat is provided with threads;
the compression screw (4) is a hexagonal thin-wall nut, the thickness of the nut is the same as the length of the cylindrical part of the inner mounting seat (1), the thread is matched with the compression screw thread (1-4) of the cylindrical part of the inner mounting seat (1), and the diameter of the circumscribed circle of the nut is slightly smaller than the outer diameter of the outer mounting seat (3);
the fixing screw (5) is a hexagonal thin-wall nut, and the threads are matched with the threads of the outer mounting seat (3).
2. The pressure sensor mounting structure under a background condition of high impact acceleration according to claim 1, wherein: the length of the inner mounting seat (1) is 0.3-0.5 mm shorter than that of the pressure sensor, the length of the circular truncated cone part accounts for two thirds, the included angle between a generating line of the circular truncated cone and a rotating shaft is 10-30 degrees, the specification and the length of a sensor mounting thread (1-3) are matched according to the pressure sensor, and the length of a pressing thread (1-4) is 1-2 mm shorter than that of the cylindrical part of the inner mounting seat (1).
3. The pressure sensor mounting structure under a background condition of high impact acceleration according to claim 1, wherein: the vibration isolator (2) is made of a high-elasticity material, the thickness of the funnel-shaped cylinder is 1-2 mm, and the thickness of the circular ring pad is 2-3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910383888.4A CN110108410B (en) | 2019-05-08 | 2019-05-08 | Pressure sensor mounting structure under high impact acceleration background condition |
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| CN201910383888.4A CN110108410B (en) | 2019-05-08 | 2019-05-08 | Pressure sensor mounting structure under high impact acceleration background condition |
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| US4779852A (en) * | 1987-08-17 | 1988-10-25 | Teleco Oilfield Services Inc. | Vibration isolator and shock absorber device with conical disc springs |
| CN102032959A (en) * | 2010-11-23 | 2011-04-27 | 北京铁科首钢轨道技术有限公司 | Vertical intelligent force measurement support |
| CN203594672U (en) * | 2013-12-10 | 2014-05-14 | 祝月强 | Novel assembly connection nut |
| CN106248282A (en) * | 2016-09-23 | 2016-12-21 | 西安近代化学研究所 | A kind of wall pressure measurement apparatus of resistance to HI high impact |
| CN106321716A (en) * | 2016-10-27 | 2017-01-11 | 中国海洋大学 | Magnetorheological elastomer vibration isolator |
| CN107014533A (en) * | 2017-04-18 | 2017-08-04 | 西安近代化学研究所 | A kind of quick response impact wave filter measured suitable for quasi-static pressure |
| CN206693910U (en) * | 2017-04-20 | 2017-12-01 | 黄河科技学院 | Down-the-hole air hammer with temperature, pressure detecting function |
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2019
- 2019-05-08 CN CN201910383888.4A patent/CN110108410B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4779852A (en) * | 1987-08-17 | 1988-10-25 | Teleco Oilfield Services Inc. | Vibration isolator and shock absorber device with conical disc springs |
| CN102032959A (en) * | 2010-11-23 | 2011-04-27 | 北京铁科首钢轨道技术有限公司 | Vertical intelligent force measurement support |
| CN203594672U (en) * | 2013-12-10 | 2014-05-14 | 祝月强 | Novel assembly connection nut |
| CN106248282A (en) * | 2016-09-23 | 2016-12-21 | 西安近代化学研究所 | A kind of wall pressure measurement apparatus of resistance to HI high impact |
| CN106321716A (en) * | 2016-10-27 | 2017-01-11 | 中国海洋大学 | Magnetorheological elastomer vibration isolator |
| CN107014533A (en) * | 2017-04-18 | 2017-08-04 | 西安近代化学研究所 | A kind of quick response impact wave filter measured suitable for quasi-static pressure |
| CN206693910U (en) * | 2017-04-20 | 2017-12-01 | 黄河科技学院 | Down-the-hole air hammer with temperature, pressure detecting function |
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