CN107575530B - With the composite damper for sacrificing structure - Google Patents

With the composite damper for sacrificing structure Download PDF

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Publication number
CN107575530B
CN107575530B CN201710890777.3A CN201710890777A CN107575530B CN 107575530 B CN107575530 B CN 107575530B CN 201710890777 A CN201710890777 A CN 201710890777A CN 107575530 B CN107575530 B CN 107575530B
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China
Prior art keywords
protection component
sacrifice
shell
overload
composite damper
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CN201710890777.3A
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CN107575530A (en
Inventor
周博远
柴宏玉
康苗苗
王恪良
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Beijing Microelectronic Technology Institute
Beijing Times Minxin Technology Co Ltd
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Beijing Microelectronic Technology Institute
Beijing Times Minxin Technology Co Ltd
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Abstract

The present invention relates to a kind of with the composite damper structure for sacrificing structure, characterized by comprising: shell structure, shock bracket and sacrifice structure;The shock bracket is arranged inside shell structure, is used to support by protection component;The sacrifice structure setting is between the bottom end and shell structure by protection component;After bearing axial high impact overload, sacrifices structure and generate plastic deformation.Shock-damping structure of the invention has small in size; light-weight feature; in addition to such as common damper is to the filter capacity of random vibration, there is certain disposable superelevation overload protection ability, the mechanics sensory system application being primarily adapted for use on missile-borne IMU or other missile-borne platforms.

Description

With the composite damper for sacrificing structure
Technical field
The present invention relates to a kind of with the composite damper for sacrificing structure, belongs to vibration damping structure technology field.
Background technique
IMU (Inertial Measurement Unit) module, that is, Inertial Measurement Unit is mainly used for acquiring posture letter Breath, is converted into data, is supplied to the processor of total system, completes attitude algorithm, and cooperation satellite navigation constitutes integrated navigation system, Sensor in IMU mainly includes for angular rate sensor, acceleration transducer, magnetic line of force sensor, baroceptor etc..
Since MEMS device is mechanics Sensitive Apparatus, carrying platform is in transmitting/vibration in-flight and overload to being based on The inertia measurement precision of the IMU of MEMS, which is even survived, generates apparent influence, and the anti-overloading performance of high-precision MEMS device is general All over not high, existing damping scheme not can guarantee survival ability of high-precision MEMS device under the conditions of high overload.
It is reliable under the conditions of the measurement accuracy and superelevation overload (such as shell transmitting) of IMU under the conditions of raising random vibration Property, it is badly in need of providing a kind of completely new damping scheme.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide it is a kind of with sacrifice structure composite damper, It realizes to superelevation overload protection ability.
The object of the invention is achieved by following technical solution:
It provides a kind of with the composite damper structure for sacrificing structure, comprising: shell structure, shock bracket and sacrifice knot Structure;
The shock bracket is arranged inside shell structure, is used to support by protection component;
The sacrifice structure setting is between the bottom end and shell structure by protection component;Bearing axial high impact overload Afterwards, it sacrifices structure and generates plastic deformation.
Preferably, the foamed aluminium that the material of structure uses is sacrificed.Preferably, the shape for sacrificing structure is annular or circle Piece.
Preferably, yield strength of structure P is sacrificedMMeet PM<m*a/s;Wherein m is by the quality of protection component, a Gao Chong The value of overload is hit, s is by the contact area of protection component and sacrifice structure.
Preferably, under sacrificing the overload that structure is born and overloading greater than 10000G less than 18000G, it is strong to sacrifice structure yields Spend PMFor 183Mpa ± 10%, the foamed aluminum materials that structure uses 0.17 aluminium of relative density are sacrificed, by protection component and sacrifice knot The contact area of structure is not more than 67mm2
Preferably, it sacrifices structure to be mounted in shell structure, after bearing axial high impact overload, sacrifices structure and generate modeling Property deformation is simultaneously detached from by protection component.
Preferably, further include;Shock bracket includes assembly bracket, multiple pilot pins and multiple resilient cushions;The assembly branch It is through-hole in the middle part of frame, is set in through-hole by protection component, is pressed in the top for sacrificing structure;Assembly bracket circumferentially divides A resilient cushion is arranged in the multiple location holes of cloth, each positioning hole;Resilient cushion is set on pilot pin, and multiple pilot pins are for branch Support entire shock bracket.
Preferably, the pilot pin passes through the location hole of assembly bracket, and silicon rubber is perfused between pilot pin and location hole Form resilient cushion.
Preferably, resilient cushion and meeting at resonance frequency f by protection componentK is resilient cushion Rigidity, m is by the quality of protection component, according to the rigidity k for the vibration frequency band adjustment resilient cushion for being needed to filter out by protection component.
Preferably, symmetrical support lug structure is had by protection component, support lug structure is fixedly installed in the flange of shock bracket On.
Preferably, the shell structure includes upper housing and lower case, and lower case has multiple counter sinks, each counter sink One pilot pin of screw connection can be passed through.
The invention has the following advantages over the prior art:
(1) shock-damping structure of the invention has feature small in size, light-weight, except if common damper is to random vibration Outside filter capacity, there is certain disposable superelevation overload protection ability, be primarily adapted for use in missile-borne IMU or other missile-borne platforms On mechanics sensory system application.
(2) shock-damping structure of the invention, by be directed to different load quality m, the material component of adjustable resilient cushion, Change damper stiffness k, according toGuarantee that the ratio between random vibration frequency and f are greater than
By sacrificing the material component adjustment and sectional area adjustment of structure, it is suitable for different shell launching conditions.
Detailed description of the invention
Fig. 1 is the overall assembly figure that the present invention has the composite damper for sacrificing structure;
Fig. 2 is the present invention with the shock absorbing bracket structure schematic diagram in the composite damper for sacrificing structure;
Fig. 3 is the present invention with the upper housing structural schematic diagram in the composite damper for sacrificing structure;
Fig. 4 is the present invention with the lower case structural schematic diagram in the composite damper for sacrificing structure;
Fig. 5 (a) is the top view of shock bracket of the present invention;Fig. 5 (b) is the cross-sectional view of shock bracket of the present invention;
Fig. 6 is that the present invention has the shock bracket in the composite damper for sacrificing structure and the assembly signal by protection component Figure;
Fig. 7 is scheme of installation of the present invention with shock bracket in the composite damper for sacrificing structure to lower case;
Fig. 8 is the present invention by the scale diagrams of protection component (6);
Fig. 9 (a) is the top view that the present invention has the composite damper for sacrificing structure;Fig. 9 (b) is that the present invention has sacrifice The sectional view of the composite damper of structure;
Figure 10 is that the present invention has the upper housing for the composite damper for sacrificing structure and the assembling schematic diagram of lower case;
Figure 11 (a) is lower case of the present invention and sacrifice structure scheme of installation;Figure 11 (b) is lower case of the present invention and sacrifice Sectional view after structure installation.
Specific embodiment
The present invention proposes a kind of composite damper with sacrifice structure, and by upper housing 1, lower case 2, shock bracket 3 subtracts It shakes pad 4, sacrifice the composition of structure 5, wherein resilient cushion 4 is directly molded in shock bracket 3 by mold, is played in the work environment To the physical protection of internal funtion part, make entire component in transmitting, transport, use at an entirety.The invention has body Product is small, easily assembles, light-weight, mechanical strength is big, the feature of anti high overload.
It is generally acknowledged that the overload of random vibration is less than 5000G, frequency 10Hz-2000Hz, approximate semisinusoidal width is less than 1ms, this kind of vibration is mainly isolated in resilient cushion 4, and to guarantee during vibration, and the angle of shock bracket 3 is not more than partially 0.05°。
Furthermore the disposable protection of superelevation overload refers to, the plastic deformation by sacrificing structure (5) absorbs energy, will 20000G semisinusoidal width is the overload of 8ms-10ms, decays to less than 12000G, makes to load on by the practical mistake of protection component 6 In the range of being loaded in it and can bearing, so that the failure under superelevation overload condition is avoided, due to sacrificing the plastic deformation of structure 5 only It can occur once, therefore can be only formed disposable superelevation overload protection.
Before experience superelevation overload, shock bracket 3 directly contacts between sacrifice structure 5, in superelevation overload work, by Resilient cushion 4 and sacrifice structure 6 bear the inertia force that overload generates jointly, and elastic deformation occurs respectively under the action of inertia force And plastic deformation sacrifices structure 6 and plastic deformation has occurred and has separated with shock bracket 3, at this time after the unloading of superelevation overload stresses Shock bracket 3 is carried by resilient cushion 4 completely and by protection component 6, plays the function of isolation random vibration.Resilient cushion 4 is storing The opposite direction in high overload acceleration direction is biased under state, to increase the deformation stroke for sacrificing structure 6, but the deformation stored for a long time Smaller, creep will not cause defective shock absorber.
As shown in Figure 1, being overall assembly figure of the invention, i.e., citation form of the invention, it is by upper housing 1, lower case 2, shock bracket 3, resilient cushion 4 sacrifice the composition of structure 5, and wherein resilient cushion 4 is directly molded in shock bracket 3 by mold, such as Shown in Fig. 5.It is installed on the flange of shock bracket 3 by protection component 6 using the countersunk head screw of M2 × 4, such as Fig. 6, then by damping branch Frame 3 is mounted on the resilient cushion location hole of lower case 2 and upper housing 1, by taking the locating slot in lower case 2 as an example, such as Fig. 7, finally will Upper housing 1 and lower case 2 complete module assembly, such as Figure 10 by the connection of M2 × 4.Integral module sectional view such as Figure 11.This programme In, in addition to resilient cushion 4, remaining structure material is 7A04 duralumin.
The main material that sacrifice structure of the invention uses is foamed aluminium, and energy-absorbing mode is plastic deformation, in primary Gao Chong After hitting overload, certain plastic deformation can be generated by sacrificing structure, it is therefore desirable to be expired by adjusting the specific mechanical characteristic of material Foot actual needs.Sacrifice yield strength of structure PMMeet PM<m*a/s;Wherein m is by the quality of protection component 6, and a is HI high impact The value of load, s are by the contact area of protection component 6 and sacrifice structure 5.
With maximum overload 15000G, protected module quality 100g, shell goes out thorax speed 900m/s, and length of barrel 8m is Example, it is the overload that 1.5mm can meet unloading 10000G or more that structural type variable is sacrificed in design, and stroke does not influence to be more than damping The type variable that device (shock bracket and resilient cushion) allows.
Such as: under 15000G overload, the inertia force of 100g load is 14700N, and sacrificing structure is annular, annular diameters 17mm, outer annular diameter 19mm.Sectional area 56.5mm2, overload to the pressure P for sacrificing structural section0=14700N/56.5mm2= 260Mpa, design yield strength PMFor P0* 0.707=183MPa.Foamed aluminum materials used in this example are the aluminium of relative density 0.17 Material, effective strain 0.05-0.7 need to design limiting device, avoid strain more than 0.7, can when 50% strain occurs for the aluminium The energy of about 2.5MJ/cm3 is absorbed, the impact of laboratory 15000G, 20us about produce the deformation of 0.4mm.
Density of material, the constant item of relative density are adjusted when preparing material by adjusting the ratio and granular size of sodium chloride Part, which lowers whole alloying component, can adjust yield strength.General foamed aluminum materials density is smaller, and yield region is wider, in yield region, bubble Foam aluminium is sustainable to be strained, and yield strength is constant, and using this material property, the overload that can be protected as needed is set The yield strength of material is set, and by adjusting the pressure for the sectional area adjustment contact surface for sacrificing structure.
Structure is sacrificed as disposable cushioning product, can be used in shell transmitting etc., disposably by large impact Occasion, can be realized to 200us no more than 20000G overload decay, attenuation rate 50%~70%.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.

Claims (7)

1. it is a kind of with sacrifice structure composite damper structure, characterized by comprising: shell structure, shock bracket (3) and It sacrifices structure (5);
The shock bracket (3) is arranged inside shell structure, is used to support by protection component (6);
Sacrifice structure (5) is arranged by between the bottom end and shell structure of protection component (6);Bearing axial HI high impact After load, sacrifices structure (5) and generate plastic deformation;
Sacrifice yield strength of structure PMMeet PM<m*a/s;Wherein m is by the quality of protection component (6), and a is high impact overload Value, s are by the contact area of protection component (6) and sacrifice structure (5);
It sacrifices structure (5) to be mounted in shell structure, after bearing axial high impact overload, sacrifices structure (5) and generate plasticity shape Become and is detached from by protection component (6);
Shock bracket (3) includes assembly bracket (3-1), multiple pilot pins (3-2) and multiple resilient cushions (4);The assembly bracket It is through-hole in the middle part of (3-1), is set in through-hole by protection component (6), is pressed in the top for sacrificing structure (5);Assemble bracket A resilient cushion (4) is arranged in circumferentially distributed multiple location holes of (3-1), each positioning hole;Resilient cushion (4) is set in positioning On bolt (3-2), multiple pilot pins (3-2) are used to support entire shock bracket (3);
Resilient cushion (4) and by protection component resonance frequency f meetK is the rigidity of resilient cushion, and m is protected The quality of component, according to the rigidity k for vibration frequency band adjustment resilient cushion (4) for being needed to filter out by protection component.
2. composite damper structure according to claim 1, which is characterized in that sacrifice the foam that the material of structure uses Aluminium.
3. composite damper structure according to claim 2, which is characterized in that it is described sacrifice structure shape be annular or Disk.
4. composite damper structure according to claim 2, which is characterized in that be greater than when sacrificing the overload that structure is born 10000G is less than under 18000G overload, sacrifices yield strength of structure PMFor 183Mpa ± 10%, sacrifices structure and use relative density The foamed aluminum materials of 0.17 aluminium are not more than 67mm by protection component (6) and the contact area for sacrificing structure (5)2
5. composite damper structure according to claim 1, which is characterized in that the pilot pin (3-2) passes through assembly branch The location hole of frame (3-1), perfusion silicon rubber form resilient cushion (4) between pilot pin (3-2) and location hole.
6. composite damper structure according to claim 5, which is characterized in that there is symmetrical branch by protection component (6) Ear structure, support lug structure are fixedly installed on the flange of shock bracket (3).
7. composite damper structure according to claim 6, which is characterized in that the shell structure includes upper housing (1) With lower case (2), lower case (2) has multiple counter sinks, and each counter sink can pass through one pilot pin (3-2) of screw connection.
CN201710890777.3A 2017-09-27 2017-09-27 With the composite damper for sacrificing structure Active CN107575530B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108518450B (en) * 2018-04-20 2020-01-07 武汉中航传感技术有限责任公司 Anti-vibration device and fiber grating demodulator
CN109039347B (en) * 2018-07-31 2019-10-29 温州大学瓯江学院 A kind of transmitting set

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103134540A (en) * 2012-12-05 2013-06-05 中北大学 High overload integrated protective structure
CN203239819U (en) * 2013-05-17 2013-10-16 山东神戎电子股份有限公司 Rubber damper for components inside device
CN104775534A (en) * 2015-02-27 2015-07-15 东南大学 Vibration-reducing and energy-consuming column device of assembled foamed aluminum composite material
CN104989782A (en) * 2015-06-19 2015-10-21 苏州亚思科精密数控有限公司 Shock-absorbing pad for machine tool
CN205534001U (en) * 2016-02-05 2016-08-31 广州共盈金属制品有限公司 Diesel generating set's damping installation device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103134540A (en) * 2012-12-05 2013-06-05 中北大学 High overload integrated protective structure
CN203239819U (en) * 2013-05-17 2013-10-16 山东神戎电子股份有限公司 Rubber damper for components inside device
CN104775534A (en) * 2015-02-27 2015-07-15 东南大学 Vibration-reducing and energy-consuming column device of assembled foamed aluminum composite material
CN104989782A (en) * 2015-06-19 2015-10-21 苏州亚思科精密数控有限公司 Shock-absorbing pad for machine tool
CN205534001U (en) * 2016-02-05 2016-08-31 广州共盈金属制品有限公司 Diesel generating set's damping installation device

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