CN208188149U - The tri-shear formula piezoelectric accelerometer of anti-adverse environment - Google Patents
The tri-shear formula piezoelectric accelerometer of anti-adverse environment Download PDFInfo
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- CN208188149U CN208188149U CN201820475573.3U CN201820475573U CN208188149U CN 208188149 U CN208188149 U CN 208188149U CN 201820475573 U CN201820475573 U CN 201820475573U CN 208188149 U CN208188149 U CN 208188149U
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Abstract
The tri-shear formula piezoelectric accelerometer of anti-adverse environment, is related to sensor space technical field；Including sensing assembly, upper cover and accessory power outlet；Wherein, sensing assembly is 2 sections of column structures；The bottom of sensing assembly is positive hexagonal prism structure；Be positive triangular prism structure at the top of sensing assembly；Regular triangular prism structure is structure as a whole with regular hexagon prism structure；Upper cover is the hollow cylindrical structure of lower ending opening；Upper cover covers on the top of sensing assembly from top to bottom；Accessory power outlet is fixedly mounted on the side wall of sensing assembly bottom regular hexagon prism structure；Utility model works frequency is wide, and the amplitude linearity is small, and maximum transversal remolding sensitivity is small and exempts to debug substantially；It realizes and is measured with the vibratory impulse under severe mechanical environment and thermal environment in the models such as rocket-powered missile.
Description
Technical field
The utility model relates to a kind of sensor space technical field, the tri-shear formula of especially a kind of anti-adverse environment
Piezoelectric accelerometer.
Background technique
The vibration source of rocket and guided missile in flight course mainly has engine ignition, operation, shutdown, stage separation and sky
Vibration caused by the excitation of aerodynamic force.Strong and lasting vibration may cause the fatigue and destruction of rocket structure, while having can
It can cause the damage and failure of certain instruments, thus cause the failure of flight test.In order to determine vibration and shock environment on bullet,
In order to provide the foundation of the structure of guided missile and rocket design and the condition of instrument and equipment test, it is necessary to the vibration and impact on bullet
Environment measures, and measurement result is also the important evidence just in case rocket launching failure progress accident analysis.
Piezoelectric accelerometer is widely used in the measurement of vibratory impulse acceleration, piezoelectric accelerometer master in aerospace field
It to include compression type structure and shear structure.Aerospace field major part military service product is compression piezoelectric acceleration at present
Meter, shear structure has strong anti-interference ability compared with compression type structure, but if design is unreasonable, part material selection
The advantages of improper shear structure, just can not embody, and finished product rate is extremely low.
Utility model content
The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art, provide the tri-shear formula of anti-adverse environment
Piezoelectric accelerometer, working frequency is wide, and the amplitude linearity is small, and maximum transversal remolding sensitivity is small and exempts to debug substantially；It realizes pair
With the vibratory impulse measurement under severe mechanical environment and thermal environment in the models such as rocket-powered missile.
The above-mentioned purpose of the utility model is achieved by following technical solution:
The tri-shear formula piezoelectric accelerometer of anti-adverse environment, including sensing assembly, upper cover and accessory power outlet；Wherein,
Sensing assembly is 2 sections of column structures；The bottom of sensing assembly is positive hexagonal prism structure；Be positive trigone at the top of sensing assembly
Rod structure；Regular triangular prism structure is structure as a whole with regular hexagon prism structure；Upper cover is the hollow cylindrical structure of lower ending opening；
Upper cover covers on the top of sensing assembly from top to bottom；Accessory power outlet is fixedly mounted on sensing assembly bottom regular hexagon prism structure
Side wall on.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, the piezoelectric accelerometer further includes 3
A piezoelectric patches, 3 inertial mass and preload ring；Wherein, 3 piezoelectric patches are fixedly mounted on regular triangular prism at the top of sensing assembly
The upper surface of structure；3 inertial mass are fixedly mounted on the side wall of regular triangular prism structure；Preload ring is sleeved on 3 inertia matter
The outer wall of gauge block.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, each 3 piezoelectric patches respectively correspond placement
In the center of 3 respective sides of regular triangular prism；3 inertial mass, which respectively correspond, is placed on 3 respective sides of regular triangular prism
The lateral wall on side；And the outer wall of 3 inertial mass is circular shape；The upper table of piezoelectric patches, inertial mass and preload ring
Face is generally aligned in the same plane.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, sensing assembly bottom regular hexagon prism knot
The side wall setting of structure is fluted；Accessory power outlet and groove are interference fitted.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, the piezoelectric accelerometer passes through sensitive group
Part is connect with external object under test, and when inputted vibration impact signal, relative motion occurs for inertial mass and sensing assembly simultaneously
Inertia force is generated, inertia force acts on piezoelectric patches, and because piezoelectric effect generates charge signal after piezoelectric patches stress, charge signal is logical
It crosses accessory power outlet to be transferred in outer signals acquisition equipment, realizes vibratory impulse measurement.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, the top regular triangular prism of the sensing assembly
Three upright side walls of structure and the verticality of bottom regular hexagon prism structure upper surface are better than 0.05；And adjacent upright side wall
Angle be 60 ° ± 3 '.
In the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, the preload ring operating temperature is -55 DEG C
~+300 DEG C.
It works in the highest of the tri-shear formula piezoelectric accelerometer of above-mentioned anti-adverse environment, the piezoelectric accelerometer
Frequency is not less than 8000Hz；Frequency response unevenness is 5~8000Hz；The amplitude linearity is 200g amplitude linearity < 1%；It is maximum
Cross sensitivity ratio is less than 3%.
The utility model has the advantages that compared with prior art
(1) the utility model using tri-shear formula design, working frequency it is wide reach 8000Hz, frequency response unevenness it is good (5~
8000Hz, < 5%)；The amplitude linearity is small (200g amplitude linearity < 1%)；Maximum transversal sensitivity it is smaller (equal < 3%,
Substantially exempt to debug)；
(2) the utility model product anti-adverse environment ability is strong, can work under 200 DEG C of hot environments；It can bear
The up to impact of 12000g；It can bear -40 DEG C~75 DEG C, 10 DEG C/min, constant temperature 30 minutes multiple circulations；It can satisfy low
Warm -55 DEG C of (even -70 DEG C), 200 DEG C of high temperature of storage requirements.
Detailed description of the invention
Fig. 1 is the utility model piezoelectric accelerometer structural schematic diagram；
Fig. 2 is the utility model piezoelectric accelerometer detailed schematic；
Fig. 3 is the utility model sensing assembly structural schematic diagram.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments:
It is as shown in Figure 1 piezoelectric accelerometer structural schematic diagram, as seen from the figure, the tri-shear formula piezoelectricity of anti-adverse environment
Accelerometer, including sensing assembly 1, upper cover 2 and accessory power outlet 3；Wherein, sensing assembly 1 is 2 sections of column structures；Sensing assembly 1
Bottom be positive hexagonal prism structure；The top of sensing assembly 1 is positive triangular prism structure；Regular triangular prism structure and regular hexagon
Prism structure is structure as a whole；Three upright side walls and bottom regular hexagon rib of the top regular triangular prism structure of sensing assembly 1
The verticality of rod structure upper surface is better than 0.05；And the angle of adjacent upright side wall is 60 ° ± 3 '；Three sides and bottom positive six
Do back chipping processing in side shape prism structure upper surface contact position；Outlet hole is designed to inclined via-hole to avoid conducting wire according to product size
Compression fractures；The installation threaded hole of bottom regular hexagon prism structure upper surface is equipped with counterbore step and arrives to avoid installation bolt top
Piezoelectric accelerometer screw hole upper end influences measurement result.Upper cover 2 is the hollow cylindrical structure of lower ending opening；Upper cover 2 is from top to bottom
Cover on the top of sensing assembly 1；Accessory power outlet 3 is fixedly mounted on the side wall of 1 bottom regular hexagon prism structure of sensing assembly.
The maximum operating frequency of piezoelectric accelerometer is not less than 8000Hz；Frequency response unevenness is 5~8000Hz；The amplitude linearity is
200g amplitude linearity < 1%；Maximum transversal remolding sensitivity is less than 3%.
It is illustrated in figure 2 piezoelectric accelerometer detailed schematic, as seen from the figure, piezoelectric accelerometer further includes 3 piezoelectricity
4,3 inertial mass 5 of piece and preload ring 6；Wherein, 3 piezoelectric patches 4 are fixedly mounted on 1 top regular triangular prism of sensing assembly
The upper surface of structure；3 inertial mass 5 are fixedly mounted on the side wall of regular triangular prism structure；Preload ring 6 is sleeved on 3 inertia
The outer wall of mass block 5.In order to facilitate welding, sensing assembly 1 and upper cover 2 are all made of 1Cr18Ni9Ti stainless steel material.In order to make
Product charge sensitivity is big as far as possible, and inertial mass 6 is greater than the high-specific gravity tungsten alloy of 17.4g/cm3 using density.
Each 3 piezoelectric patches 4 respectively correspond the center for being placed on 3 respective sides of regular triangular prism；3 inertia masses
Block 5 respectively corresponds the lateral wall for being placed on 3 respective sides of regular triangular prism；And the outer wall of 3 inertial mass 5 is arc-shaped
Shape；The upper surface of piezoelectric patches 4, inertial mass 5 and preload ring 6 is generally aligned in the same plane.6 operating temperature of preload ring be -55 DEG C~+
300℃；Convenient for assembling and improving finished product rate.In order to ensure product works under+200 DEG C of hot environments for a long time, piezoelectricity
Electrical connection selection high temperature scolding tin or laser spot welding technology inside accelerometer.
It is illustrated in figure 3 sensing assembly structural schematic diagram, as seen from the figure, 1 bottom regular hexagon prism structure of sensing assembly
Side wall setting it is fluted；Accessory power outlet 3 and groove are interference fitted.
Piezoelectric accelerometer is connect by sensing assembly 1 with external object under test, when inputted vibration impact signal, inertia
Mass block 5 and sensing assembly 1 occur relative motion and generate inertia force, and inertia force acts on piezoelectric patches 4,4 stress of piezoelectric patches
Afterwards because piezoelectric effect generates charge signal, charge signal is transferred to outer signals by accessory power outlet 3 and acquires in equipment, realizes vibration
Dynamic shock measurement.
The indexs such as the maximum transversal remolding sensitivity of the utility model, frequency response unevenness, the amplitude linearity reach similar product state
Border advanced level.
The content being not described in detail in the utility model specification belongs to the well-known technique of those skilled in the art.
Claims (8)
1. the tri-shear formula piezoelectric accelerometer of anti-adverse environment, it is characterised in that: including sensing assembly (1), upper cover (2) and
Accessory power outlet (3)；Wherein, sensing assembly (1) is 2 sections of column structures；The bottom of sensing assembly (1) is positive hexagonal prism knot
Structure；Be positive triangular prism structure at the top of sensing assembly (1)；Regular triangular prism structure is structure as a whole with regular hexagon prism structure；
Upper cover (2) is the hollow cylindrical structure of lower ending opening；Upper cover (2) covers on the top of sensing assembly (1) from top to bottom；Accessory power outlet
(3) it is fixedly mounted on the side wall of sensing assembly (1) bottom regular hexagon prism structure.
2. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 1, it is characterised in that: described
Piezoelectric accelerometer further includes 3 piezoelectric patches (4), 3 inertial mass (5) and preload ring (6)；Wherein, 3 piezoelectric patches (4)
It is fixedly mounted on the upper surface of regular triangular prism structure at the top of sensing assembly (1)；3 inertial mass (5) are fixedly mounted on just
The side wall of triangular prism structure；Preload ring (6) is sleeved on the outer wall of 3 inertial mass (5).
3. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 2, it is characterised in that: each 3
A piezoelectric patches (4) respectively corresponds the center for being placed on 3 respective sides of regular triangular prism；3 inertial mass (5) are right respectively
The lateral wall of 3 respective sides of regular triangular prism should be placed on；And the outer wall of 3 inertial mass (5) is circular shape；Piezoelectricity
The upper surface of piece (4), inertial mass (5) and preload ring (6) is generally aligned in the same plane.
4. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 3, it is characterised in that: sensitive group
The side wall setting of part (1) bottom regular hexagon prism structure is fluted；Accessory power outlet (3) and groove are interference fitted.
5. the tri-shear formula piezoelectric accelerometer of anti-adverse environment described in one of -4 according to claim 1, it is characterised in that:
The piezoelectric accelerometer is connect by sensing assembly (1) with external object under test.
6. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 5, it is characterised in that: described quick
Feel three upright side walls of the top regular triangular prism structure of component (1) and the verticality of bottom regular hexagon prism structure upper surface
Better than 0.05；And the angle of adjacent upright side wall is 60 ° ± 3 '.
7. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 3, it is characterised in that: described pre-
Tight ring (6) operating temperature is -55 DEG C~+300 DEG C.
8. the tri-shear formula piezoelectric accelerometer of anti-adverse environment according to claim 7, it is characterised in that: the pressure
The maximum operating frequency of electric accelerometer is not less than 8000Hz；Frequency response unevenness is 5~8000Hz；The amplitude linearity is 200g
Amplitude linearity < 1%；Maximum transversal remolding sensitivity is less than 3%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
| CN114563596A (en) * | 2021-11-16 | 2022-05-31 | 浙江中控技术股份有限公司 | Anti-interference and high-pressure-resistant triangular shear piezoelectric acceleration sensor |
-
2018
- 2018-04-04 CN CN201820475573.3U patent/CN208188149U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
| CN114563596A (en) * | 2021-11-16 | 2022-05-31 | 浙江中控技术股份有限公司 | Anti-interference and high-pressure-resistant triangular shear piezoelectric acceleration sensor |
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