CN108459173A - A kind of mechanical filter applied to high G-value jerk acceleration transducer - Google Patents
A kind of mechanical filter applied to high G-value jerk acceleration transducer Download PDFInfo
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- CN108459173A CN108459173A CN201810333557.5A CN201810333557A CN108459173A CN 108459173 A CN108459173 A CN 108459173A CN 201810333557 A CN201810333557 A CN 201810333557A CN 108459173 A CN108459173 A CN 108459173A
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- mechanical filter
- acceleration transducer
- gasket
- pedestal
- sensor
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pressure Sensors (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A kind of mechanical filter applied to high G-value jerk acceleration transducer finely tunes rigidity and the damping of damping material by external prestress so that there is best performance in mechanical filter pole.Mechanical filter can effectively inhibit shock transducer high-frequency vibration ingredient so that when bearing high G-value impact needle position misalignment does not occur for sensor.Mechanical filter is designed to isolated form, is capable of the electrical connection attribute of isolation sensor core and sensor outer housing, and shell interference signal is effectively avoided to influence sensor output.
Description
Technical field
The present invention relates to a kind of mechanical filters applied to high G-value jerk acceleration transducer, and in particular to Yi Zhongneng
Enough inhibit high fdrequency component of the sensor when bearing high G-value impact, can effectively inhibit shock transducer output baseline drift existing
The mechanical filter of elephant.
Background technology
A major class of the piezoelectricity high G accelerometer as high G-value acceleration, easy tos produce when bearing HI high impact
Needle position misalignment.Baseline is not on zero curve in impact process, but has a DC component on zero curve.It is learnt by analysis, by
In high G accelerometer when absorbing impact, high fdrequency component causes the sensitive core body of piezoelectric transducer to generate lasting charge.
The signal output-response that high frequency response generates shows as baseline not back to zero to sensor output.Back to zero is not direct for sensor base line
High G accelerometer acceleration measurement accuracy is influenced, leading to measurement, there are large errors.In examination high G-value
The occasion of shock frequency spectrum characteristic, baseline not back to zero frequency domain representation be low-frequency spectra distortion.Low-frequency spectra is distorted so that test examination
The low frequency characteristic of test can not be obtained by testing, and influence the experiment effect of high G-value shock measurement.In order to inhibit high G-value acceleration sensing
Device does not generate needle position misalignment when bearing HI high impact, and effectively filtering out high fdrequency component becomes the important hand for solving baseline not back to zero
Section.
Invention content
The purpose of the present invention is to provide a kind of solution piezoelectric type high G accelerometer baseline not zero resetting device, that is, machines
Tool filter improves high G-value acceleration for filtering out impact class acceleration transducer radio-frequency component when bearing high G-value impact
Sensor shock performance.
The present invention proposes a kind of mechanical filter applied to high G-value jerk acceleration transducer, the mechanical filter
Including pedestal, isolation structure, bottom filtering gasket, top filtering gasket and top briquetting, the isolation structure include bottom every
From gasket, lateral confinement structure and top isolation pad three parts；The bottom isolation pad, bottom filtering gasket, transverse direction are about
Binding structure, top filtering gasket, top isolation pad and top briquetting are sequentially loaded into the pedestal, are applied by the top briquetting
The pretightning force added tightens together above-mentioned all building blocks to form the mechanical filter, and the pedestal includes installation spiral shell
Column, hexagonal structure, barrel-like structure, installation screw thread, inboard mounting surface and bottom mounting surfaces, the top briquetting include briquetting bottom
Face, installation screw thread and loading structure.
Preferably, integrated screw rod is processed on the pedestal, for being spirally connected with external mounting surface.
Preferably, the pedestal is barrel-like structure, to place other all mechanical filter building blocks.
Preferably, the pedestal top is provided with installation screw thread, for being coordinated to mechanical filter with top briquetting
And sensor core applies pretightning force.
Preferably, the isolation structure uses polyimide material.
Preferably, it is damping material that the bottom filtering gasket, which uses circular configuration, material,.
Preferably, the thickness of the bottom filtering gasket is 1mm.
Preferably, the top filtering gasket is the circular configuration of middle with hole, and material filters gasket with the bottom
It is identical.
Preferably, the lateral confinement structure uses barrel-like structure, using polyimide material, wall thickness 0.5mm.
Realize technical scheme of the present invention：A kind of mechanical filter using high G-value jerk acceleration transducer, including with
In the filter gasket of the filter gasket and sensor core bottom end on sensor core top.Upper layer and lower layer filter gasket group
At the core of mechanical filter.
The mechanical filter that the present invention designs, the structural strength that mechanical filter is combined with accelerometer want that height can be born
The impact of G values, many simple Vibration Absorbing System Designs are disintegrated under HI high impact.
The Q values for the mechanical filter that the present invention designs want very low, to ensure that sensor is protected in wider frequency range
It holds linear.The cooperation damping characteristic of mechanical filter and sensor must emphasis consideration.
Displacement between the non-sensitive part and installation surface of the sensor that the present invention designs is linear no more than filter
Range.When the range of linearity beyond filter, mechanical filter will not have high-frequency signal filtering characteristic, sensor will lose
The protection of filter influences its output characteristics.
The transmission characteristic of mechanical filter of the present invention must clearly define, and the result of transmission characteristic must have repeatability.
Mechanical filter of the present invention uses incorporating filter structure, with high-performance mechanical filter material by sensor sensing
Core surrounds be placed in inside sensor outer housing completely.Sensor all directions have filtering characteristic.The filter that the present invention uses
Material have higher intensity simultaneously and have certain damping characteristic.
The mechanical filter that the present invention designs approximate can regard the system that spring is constituted with mass block, approximate two levels as
Model unite to characterize its response characteristic, shown in typical form universal model Fig. 9.As shown in Figure 9, by one end of spring and damper point
It is not fixed on reference coordinate to fasten, and assumes that input signal is applied directly on mass block.In Fig. 9, c indicates damped coefficient, k tables
Show that stiffness coefficient, m indicate mass block quality, b0X indicates that system institute excited target, y indicate the relative displacement that system generates.The model
Mathematic(al) representation it is as shown in Equation 3,
Wherein, a2=m, a1=c, a0=k.
Enable static sensitivityDamping ratioUndamped natural angular frequencyThen
It is as follows frequency response function can be obtained
Amplitude versus frequency characte is as follows
Damping characteristic curve is drawn according to formula (4), determines that mechanical filter damps by the damping characteristic curve of drafting
And rigidity.
Material stiffness and damping have been adjusted to optimum state by the present invention using special filtering material, ensure to use this hair
Bright sensor has preferable frequency response characteristic and preferable high-frequency suppressing characteristic.
Mechanical filter of the present invention is combined mode using top layer bottom filter and realizes mechanical filtering, can effectively filter out
Axial high fdrequency component inhibits sensor output signal needle position misalignment.
The present invention devises corresponding isolated material other than filtering material, isolated material be mainly used for sensor core with
Shell is isolated, and sensor outer housing interference signal is avoided to introduce sensor output.
The present invention uses top outlet method, and top is using filter material and isolated material combination.Filtering material
Form high-frequency suppressing effect by the damping of itself and rigidity, isolated material isolation core and shell avoid sensor output with it is outer
Shell phase even introduces interference.Filtering material and isolated material are designed to that the disc structure of middle with hole, interstitial hole are used for by the present invention
Outlet.
The mechanical filter that the present invention designs needs to apply precompressed force effect to briquetting, and the effect of briquette structure is mainly used for
Apply external prestress, sensor core and filtering material isolated material are pressed together and improve sensor rigidity.Briquetting is made
Firmly so that filtering material reaches best filter state, briquetting prestress value is determined by repetition test, and filtering material is filtered
Wave performance performs to optimum state.
The present invention is suitable for the piezoelectric impact sensor with molding sensitive core body, quick by mechanical filter improved effect
Feel core output characteristics and inhibits needle position misalignment phenomenon.By isolated material be placed in pedestal bottommost filtering material be placed in isolated material it
On, it avoids, since insulation characterisitic reduces after filtering material stress, sensitive core body being caused to introduce external disturbance with base contacts.It will be quick
Sense core is placed on filtering material, at the top of sensitive core body assembly filtering material and by isolated material be placed in top filtering material it
On.Top isolated material forms pressing relationship with top briquetting, and sensitive core body mechanical filter is combined into after the completion of assembly.
The present invention avoids generating lateral displacement when bearing high G-value impact due to sensor using lateral confinement structure,
Lead to the component of acceleration outside sensor output amount of production.Lateral confinement structure is installed to sensitive core body outer surface, in sensor
It is fitted into sensor outer housing together with core when whole assembly.
The advantageous effect of the present invention compared to the prior art is：
1) mechanical filter of the invention can help to solve conventional piezoelectric sensor baseline when bearing high G-value impact
Cheap problem；
2) mechanical filter of the invention can effectively filter out the high-frequency percussion suffered by sensor core, and effective protection passes
Sensor core；
3) present invention uses isolation structure, overcomes conventional piezoelectric sensor and exports the influence sensing that is connected with sensor outer housing
The deficiency of device output.Filter makes sensor core be isolated with shell electric appliance, avoids sensor core output by shell shadow
It rings.
Description of the drawings
Fig. 1 is the cross-sectional view of the mechanical filter of jerk acceleration transducer of the embodiment of the present invention；
Fig. 2 is the cross-sectional view of mechanical filter building block pedestal of the embodiment of the present invention；
Fig. 3 is the isolation pad structure schematic diagram of mechanical filter building block of embodiment of the present invention bottom surface；
Fig. 4 is the filtering gasket construction schematic diagram of mechanical filter building block of embodiment of the present invention bottom surface；
Fig. 5 is the structural schematic diagram of mechanical filter building block lateral confinement structure of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of mechanical filter building block of embodiment of the present invention top surface filtering gasket；
Fig. 7 is the structural schematic diagram of mechanical filter building block of embodiment of the present invention top surface isolation pad；
Fig. 8 is the structural schematic diagram of briquetting at the top of the top surface of the embodiment of the present invention；
Fig. 9 is the damper model schematic diagram of the embodiment of the present invention.
Wherein, the reference numerals are as follows：Pedestal 1, bottom surface isolation pad 2, bottom surface filtering gasket 3, lateral confinement structure
4, top surface filtering gasket 5, top surface isolation pad 6, top briquetting 7, installation stud 11, hexagonal structure 12, barrel-like structure 13, installation
Screw thread 14, inboard mounting surface 15, bottom mounting surfaces 16, briquetting bottom surface 71, installation screw thread 72, loading structure 73.
Specific implementation mode
The implementation of the present invention is further detailed below in conjunction with attached drawing.Referring to Fig. 1-Fig. 9, it is described more fully below
The feature and exemplary embodiment of various aspects of the invention.The feature of various aspects of the invention is described more fully below and shows
Example property embodiment.In the following detailed description, it is proposed that many details, in order to provide complete understanding of the present invention.
The present invention relates to a kind of novel mechanical filter constructions, in order to preferably be described, are carried out to specific implementation mode in conjunction with figure
Description.Shown in Fig. 1~Fig. 8, the present invention proposes that a kind of mechanical filter applied to HI high impact sensor designs, and includes mainly bottom
Seat 1, bottom surface isolation pad 2, bottom surface filtering gasket 3, lateral confinement structure 4, top surface filtering gasket 5, top surface isolation pad 6, top
Portion's briquetting 7.All structures form mechanical filter structure by being sequentially completed successively.Mechanical filter is by filtering material
The damping of material and stiffness combine filter out shock transducer high-frequency signal when absorbing impact.
The structure in conjunction with shown in Fig. 1 describes total assembling process.Bottom surface isolation pad 2 is positioned over pedestal bottom first
Portion, must be smooth when bottom surface isolation pad 2 is placed, and destruction is generated to power gasket when the later stage being avoided to install.Bottom surface is isolated
Gasket 2, which is placed, completes to place filtering gasket 3 in bottom surface on bottom surface isolation pad 2 later, and bottom surface filtering gasket 3 relies primarily on itself
Damping and rigidity generate filtering characteristic.Bottom surface filters 3 bottom surface of gasket and forms fitting surface, bottom surface filter with 2 top surface of bottom surface isolation pad
3 top surface of wave gasket forms fitting surface with sensor core bottom surface.Bottom surface filtering gasket 3 is made of damping material, material property
With certain pliability, assembly when, must ensure that bottom surface filtering gasket 3 is smooth.Bottom surface isolation pad 2, bottom surface filter gasket
After the completion of 3 assembly, lateral confinement structure 4 is assembled to sensor chip side wall.4 top edge of lateral confinement structure and sensor
Core top edge is concordant, and lateral confinement structure 4 must wrap sensor sensing core well, can be in lateral side
Ensure isolated relation between sensor core and pedestal upwards.Lateral confinement structure 4 assemble after the completion of, by sensor core together with
Lateral confinement structure 4 is assembled in pedestal.Since lateral confinement structure 4 acts on, sensor sensing core and lateral confinement structure 4
Matching relationship is tight fit between pedestal 1 after assembly completion, and tight fit can effectively inhibit sensor core bearing high G
Value generates lateral displacement when impacting.Sensor core is installed to pedestal, the filtering material at the top of sensors topside assembly
5, there is terminal with sensitive core body and forms assembly relation in filtering material 5 center mounting hole in top surface.5 bottom surface of top surface filtering material with it is quick
Feel core top surface and form fitting surface, the assembly of top surface filtering material 5 assembles top surface isolation pad 6, top surface isolation pad 6 after completing
There is terminal with sensitive core body and forms assembly relation in center mounting hole.Isolation pad 6 upper surface in top surface forms with 7 bottom surface of briquetting and fills
With face, the assembly of top surface isolation pad 6 installs briquetting 7 after completing.Briquetting 7 is by Screw assembly to pedestal 1, assembling briquetting
Applied pre-fastening moment is measured when 7 by torque spanner, filtering material rigidity and resistance are changed by control moment size
Buddhist nun.
Fig. 2 is mechanical filter pedestal 1, and pedestal is by installation stud 11, hexagonal structure 12, barrel-like structure 13, installation screw thread
14, inboard mounting surface 15, bottom mounting surfaces 16.Installation 11 structure of stud is mainly used for sensor and is installed with external mounting surface, and one
Bodyization installation stud 11 simplifies structure, improves the rigidity of structure.The rigidity of simplified structure and reinforcing is bearing high G-value impact
When it is most important, disclosure satisfy that structure be unlikely to when high G-value impacts generate destruction.1 inboard mounting surface 15 of pedestal is directly
Assembly relation is formed with bottom surface isolated material 2, pedestal acceleration is passed to by sensing by power transfer mode when in use
Device sensitive core body.1 inside installation bottom surface 15 of pedestal needs higher flatness, avoids causing since flatness does not reach requirement
Mechanical filter structural failure.1 bottom mounting surfaces 16 of pedestal are also required to higher flatness, to coordinate with external mounting surface.
It needs to keep the higher depth of parallelism, the high depth of parallelism that can ensure in an axial direction between inside installation bottom surface 15 and bottom mounting surfaces 16
Impact not will produce other components of acceleration and then improve measurement accuracy.13 structure of barrel-like structure is primarily used to form outside sensor
Shell protects sensor core not by external damage.Devised on barrel-like structure 13 installation screw thread 14, installation screw thread 14 mainly with pressure
Block 7 installs screw thread 72 and forms assembly relation.Briquetting 7 forces tight mechanical filter structure by installing the offer of screw thread 14 when assembly,
Installation screw thread generation is tried hard to keep enough demonstrate,proves mechanical filter intensity, it is made to be unlikely to generate destruction when bearing high G-value impact.
Fig. 3 is bottom surface isolation pad 2, and ground isolation pad is needed by sufficient intensity, higher insulation characterisitic.Bottom surface is isolated
Gasket 2 uses high-strength insulating material machine-shaping.2 sufficient intensity of bottom surface isolation pad and minimum damping, avoid the bottom of due to
The change of 2 material property of face isolation pad can not debug bottom surface filtering 3 material property of gasket.
Fig. 4 is that bottom surface filters gasket 3, and bottom surface filters gasket 3 and is used as the most crucial component of mechanical filter, to its material property
It is required that extremely harsh.Filtering material belongs to damping material, material property in addition to other than by itself affect also with suffered external force phase
It closes.After type selecting filtering material, need to determine pretightning force suffered by filtering material by repetition test, it is final so that filtering material
Material reaches optimum performance.Filtering material damping characteristic can influence sensor linearity to a certain extent, therefore select filtering
Influence of the material to the sensor core linearity must be controlled when material.Bottom surface filters gasket 3 using simplified round knot
Structure, thickness are determined as 1mm by repetition test, type selecting of the present invention material by various experiments, determine 1mm thickness to full
Sufficient sensor High frequency filter demand, and ensure that sensor linearity is not influenced by filtering material.
Fig. 5 is lateral confinement structure 4, and lateral confinement structure 4 is designed to that garden barreled is assembled with sensor core outer wall.
Lateral confinement structure 4 is assembled with pedestal 1 again after being assembled with sensor core, lateral confinement structure 4 and the sensor core bodily form
At assembly and shell be necessary for tight fit relationship, avoid generating lateral displacement when absorbing impact.
The top surfaces Fig. 6 filtering gasket 5 is designed to the structure of middle with hole, and interstitial hole effect is to be used for assembly sensor outlet
Terminal.Top surface filters the filtering material identical as bottom surface filtering 3 use of gasket of gasket 5, is to meet using top surface filtering gasket 5
Mechanical filter symmetric row makees filtering gasket 5 to thicken processing guarantee mechanical filter up-down symmetry.
Fig. 7 is top surface isolation pad 6, and top surface isolation pad 6 designs main function isolation sensor core and shell is electrical
Connection performance avoids because shell has an impact sensor output.Another effect of top surface isolation pad 6 is used as filtering
Material is isolated with top briquetting 7, and since filtering material is damping material, briquetting is in direct contact filtering material and is applying pretightning force
When most likely result in the destruction of filtering material.
Fig. 8 is top briquetting 7, and briquetting 7 structure in top includes mainly briquetting bottom surface 71, installation screw thread 72, loading structure 73.
Briquetting 7 structure briquetting bottom surface 71 in top needs enough flatness, avoids occurring bias when assembly and cannot achieve and 1 spiral shell of pedestal
Line assembles.Installation screw thread 72 needs to ensure sufficient intensity, and installation screw thread 72 is mainly for generation of pretightning force, and enough pretightning forces are
It can guarantee sensor intensity.73 main function of loading structure is for loading, torque spanner being facilitated to be clamped.
The content that description in the present invention is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
The above embodiment of the present invention is to cannot be used for the limitation present invention to the explanation of scheme, has protection domain comparable with the present invention
Any change in meaning and scope is all considered as including within the protection scope of the present invention.
Claims (9)
1. a kind of mechanical filter applied to high G-value jerk acceleration transducer, it is characterised in that：The mechanical filter includes
Pedestal (1), isolation structure, bottom filtering gasket (3), top filtering gasket (5) and top briquetting (7), the isolation structure packet
Include bottom isolation pad (2), lateral confinement structure (4) and top isolation pad (6) three parts；The bottom isolation pad (2),
Bottom filters gasket (3), lateral confinement structure (4), top filtering gasket (5), top isolation pad (6) and top briquetting (7)
It is sequentially loaded into the pedestal (1), above-mentioned all building blocks are fastened on one by the pretightning force applied by the top briquetting (7)
It rises and forms the mechanical filter, the pedestal (1) includes installation stud (11), hexagonal structure (12), barrel-like structure (13), peace
Screw thread (14), inboard mounting surface (15) and bottom mounting surfaces (16) are filled, the top briquetting (7) includes briquetting bottom surface (71), peace
Fill screw thread (72) and loading structure (73).
2. according to a kind of mechanical filter applied to high G-value jerk acceleration transducer described in claim 1, feature
It is：Integrated screw rod is processed on the pedestal (1), for being spirally connected with external mounting surface.
3. according to a kind of mechanical filter applied to high G-value jerk acceleration transducer described in claim 1, feature
It is：The pedestal (1) is barrel-like structure, to place other all mechanical filter building blocks.
4. according to a kind of mechanical filter applied to high G-value jerk acceleration transducer described in claim 1, feature
It is：Pedestal (1) top is provided with installation screw thread (14), for being coordinated to mechanical filter with top briquetting (7)
And sensor core applies pretightning force.
5. a kind of mechanical filter applied to high G-value jerk acceleration transducer according to claim 1, feature exist
In：The isolation structure uses polyimide material.
6. a kind of mechanical filter applied to high G-value jerk acceleration transducer according to claim 1, feature exist
In：It is damping material that the bottom filtering gasket (3), which uses circular configuration, material,.
7. a kind of mechanical filter applied to high G-value jerk acceleration transducer according to claim 1, feature exist
In：The thickness of the bottom filtering gasket (3) is 1mm.
8. a kind of mechanical filter applied to high G-value jerk acceleration transducer according to claim 1, feature exist
In：The top filtering gasket (5) is the circular configuration of middle with hole, and material is identical as bottom filtering gasket (3).
9. a kind of mechanical filter applied to high G-value jerk acceleration transducer according to claim 1, feature exist
In：The lateral confinement structure (4) uses barrel-like structure, using polyimide material, wall thickness 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810333557.5A CN108459173B (en) | 2018-04-13 | 2018-04-13 | Mechanical filter applied to high-G-value impact acceleration sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810333557.5A CN108459173B (en) | 2018-04-13 | 2018-04-13 | Mechanical filter applied to high-G-value impact acceleration sensor |
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| Publication Number | Publication Date |
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| CN108459173A true CN108459173A (en) | 2018-08-28 |
| CN108459173B CN108459173B (en) | 2023-08-11 |
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| Publication number | Publication date |
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| CN108459173B (en) | 2023-08-11 |
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