CN104793013A - Application of honeycomb duct in molecule-electron induction accelerometer - Google Patents
Application of honeycomb duct in molecule-electron induction accelerometer Download PDFInfo
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- CN104793013A CN104793013A CN201510168532.0A CN201510168532A CN104793013A CN 104793013 A CN104793013 A CN 104793013A CN 201510168532 A CN201510168532 A CN 201510168532A CN 104793013 A CN104793013 A CN 104793013A
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- induction type
- honeycomb duct
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- accelerometer
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Abstract
The invention relates to application of a honeycomb duct in a molecule-electron induction accelerometer, belongs to the field of sensors and aims to add a honeycomb duct structure in a reaction cavity of a molecule-electron induction accelerometer to suppress internal noise of the accelerometer. The honeycomb duct structure is filled in the reaction cavity of the molecule-electron induction accelerometer, and the honeycomb duct and the cylinder of the reaction cavity are adhered by waterproof super glue. Fluid speed field stability of electrolyte in the reaction cavity of the molecule-electron induction accelerometer is effectively improved, turbulence effect is reduced, and internal noise of the molecule-electron induction accelerometer is suppressed. In addition, speed field distribution of electrolyte before and after adding the honeycomb duct in the reaction cavity is given out by multi-physics field simulation, and it is proved that internal noise of the molecule-electron induction accelerometer can be reduced.
Description
Technical field
The invention belongs to sensor field.
Background technology
Self-noise is the key factor affecting molecular-electronics induction type accelerometer performance, and is the main self-noise of accelerometer to flow noise.Moved by the fluid velocity field instability of electrolytic solution in cavity to cause turbulent motion to cause to flow noise.Electrolyte flow velocity field is more unstable easilier there is turbulent flow in reaction chamber, and corresponding output noise level is higher.Therefore, reduce electrolyte flow speed instability, suppress turbulence effect, have very positive meaning to the noise reducing molecular-electronics induction type accelerometer.
The self-noise of current molecular-electronics induction type accelerometer both domestic and external suppresses the optimization aspect also rested on wave detector sensitive element design size, not yet occurs the noise-reduction method changing accelerometer cylindrical reaction cavity configuration.
Summary of the invention
The object of the invention is in molecular-electronics induction type accelerometer reaction chamber, add the application of honeycomb duct on molecular-electronics induction type accelerometer that honeycomb duct structure carrys out rejection of acceleration meter self-noise.
Honeycomb duct structure filling in molecular-electronics induction type accelerometer reaction chamber, is used waterproof strong glue bond by the present invention between honeycomb duct and reaction chamber right cylinder.
Verification method of the present invention is: adopt multiple physical field emulation technology to carry out modeling and simulating to honeycomb duct structural molecule-electric induction type accelerometer, and realistic model adopts Comsol Multiphysics multiple physical field emulation platform;
The effect of ion migration of molecular-electronics induction type accelerometer reaction chamber electrolyte inside is described by Nernst-Plank equation, and equation is as follows:
Wherein,
it is current density;
,
with
it is the coefficient of diffusion of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
,
with
represent the concentration of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
represent the electric potential difference between anode and cathode;
it is velocity; F is Faraday constant;
it is gas constant;
The electrolyte movement of molecular-electronics induction type accelerometer reaction chamber is described by Navier-Stokes equation, and equation is as follows:
Wherein,
for the time;
for density of electrolyte;
for electrolytic solution viscosity;
for the acceleration of extraneous vibration excitation;
The relation of the ion concentration-electric current on molecular-electronics induction type accelerometer sensitive element is described by Butler-Volmer equation, and equation is as follows:
Wherein,
it is electrode surface normal vector parameter;
with
it is the reaction constant of anode and cathode; N=1 is the electrically charged number of band point ion;
being 0.5, is the conversion coefficient of electrodic electron and electric charge; U is voltage added between anode and cathode;
it is the equilibrium potential of electrochemical reaction.
The present invention can effectively increase the fluid velocity field stability of molecular-electronics induction type accelerometer reaction chamber electrolyte inside, decreases the generation of turbulence effect, and then inhibits the self-noise of molecular-electronics induction type accelerometer.And give in reaction chamber add electrolyte velocity field distribution before and after honeycomb duct by multiple physical field emulation, demonstrate the method and can reduce molecular-electronics induction type accelerometer self-noise.
Accompanying drawing explanation
Fig. 1 is the cylindrical reaction cavity structure of molecular-electronics induction type accelerometer;
Fig. 2 is honeycomb duct structural drawing;
Honeycomb duct is put into cylindrical reaction chamber by Fig. 3;
Fig. 4 is the cylindrical reaction cavity of existing molecular-electronics induction type accelerometer electrolyte inside velocity field distribution plan when t=120s;
Fig. 5 is a certain aperture reaction chamber of seven apertures in the human head cellular structure molecular-electronics induction type accelerometer internal speed field pattern when t=120s;
Fig. 6 is existing molecular-electronics induction type accelerometer sports ground velocity test figure;
Fig. 7 is the molecular-electronics induction type accelerometer sports ground velocity test figure adding seven-hole honeycomb tube structure;
Fig. 8 is seven-hole honeycomb tube dimensional drawing;
Fig. 9 is molecule-electronic accelerometer signal gain test macro;
Figure 10 adds the accelerometer signal gain change graph of seven-hole honeycomb tube fore-aft acceleration meter at different frequency.
Embodiment
Honeycomb duct structure filling in molecular-electronics induction type accelerometer reaction chamber, is used waterproof strong glue bond by the present invention between honeycomb duct and reaction chamber right cylinder.
Verification method of the present invention is: adopt multiple physical field emulation technology to carry out modeling and simulating to honeycomb duct structural molecule-electric induction type accelerometer, and realistic model adopts Comsol Multiphysics multiple physical field emulation platform;
The effect of ion migration of molecular-electronics induction type accelerometer reaction chamber electrolyte inside is described by Nernst-Plank equation, and equation is as follows:
Wherein,
it is current density;
,
with
it is the coefficient of diffusion of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
,
with
represent the concentration of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
represent the electric potential difference between anode and cathode;
it is velocity; F is Faraday constant;
it is gas constant;
The electrolyte movement of molecular-electronics induction type accelerometer reaction chamber is described by Navier-Stokes equation, and equation is as follows:
Wherein,
for the time;
for density of electrolyte;
for electrolytic solution viscosity;
for the acceleration of extraneous vibration excitation;
The relation of the ion concentration-electric current on molecular-electronics induction type accelerometer sensitive element is described by Butler-Volmer equation, and equation is as follows:
Wherein,
it is electrode surface normal vector parameter;
with
it is the reaction constant of anode and cathode; N=1 is the electrically charged number of band point ion;
being 0.5, is the conversion coefficient of electrodic electron and electric charge; U is voltage added between anode and cathode;
it is the equilibrium potential of electrochemical reaction.
Below further detailed description is done to the present invention:
Technical solution of the present invention is achieved in that
The method is passed through by honeycomb duct structure filling in existing molecular-electronics induction type accelerometer reaction chamber, and use waterproof strong glue bond between honeycomb duct and reaction chamber right cylinder, honeycomb duct structure is made up of PVC material, as shown in Figure 2.
For checking this patent method is effective, now adopt multiple physical field emulation technology to without honeycomb duct structural molecule-electronic accelerometer with have honeycomb duct structural molecule-electric induction type accelerometer to carry out modeling and simulating respectively.Realistic model adopts Comsol Multiphysics multiple physical field emulation platform, has merged multiple system of equations in model.
The effect of ion migration of molecular-electronics induction type accelerometer reaction chamber electrolyte inside can be described by Nernst-Plank equation, and equation is as follows:
Wherein,
it is current density;
,
with
it is the coefficient of diffusion of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
,
with
represent the concentration of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
represent the electric potential difference between anode and cathode;
it is velocity; F is Faraday constant;
it is gas constant.
The electrolyte movement of molecular-electronics induction type accelerometer reaction chamber describes by Navier-Stokes equation, and equation is as follows:
Wherein,
for the time;
for density of electrolyte;
for electrolytic solution viscosity;
for the acceleration of extraneous vibration excitation.
The relation of the ion concentration-electric current on molecular-electronics induction type accelerometer sensitive element can be described by Butler-Volmer equation, and equation is as follows:
Wherein,
it is electrode surface normal vector parameter;
with
it is the reaction constant of anode and cathode; N=1 is the electrically charged number of band point ion;
being 0.5, is the conversion coefficient of electrodic electron and electric charge; U is voltage added between anode and cathode;
it is the equilibrium potential of electrochemical reaction.
For between the solid phase in whole model and liquid phase, all adopt fricton-tight (No slip) boundary condition.Sensor response chamber base and reactor wall all adopt plastic material to form, electrolytic solution in reaction chamber and the heat trnasfer between the peripheral plastics package of reaction chamber are set as Free Thermal conducting border condition, meanwhile, reaction chamber shell and extraneous physical environment adopt the free heat radiation boundary condition without the temperature difference.Based on the setting of upper boundary conditions, can the physical change of the fluid motion of accelerometer reaction chamber really, rational simulation and emulation can be carried out to series of complex physical influence factors such as the thermal field under true environment, electric fields simultaneously.
The each hole dimension of honeycomb duct is identical, and therefore the transport function in each hole is also consistent.So can be expressed as the integration of aperture transport function and each spot speed by the fluctuate noise that causes of flow velocity, namely noise is directly related with the integration of each spot speed.
By above-mentioned setting, the molecular-electronics induction type accelerometer with or without honeycomb duct structure just can be emulated by change cylinder diameter.When cylindrical reaction chamber in model is directly 16mm(existing molecular-electronics induction type accelerometer diameter) this model of interval scale is existing molecular-electronics induction type accelerometer multiple physical field realistic model, when diameter 5mm interval scale adds the realistic model in a molecular-electronics induction type accelerometer hole of seven-hole honeycomb tube structure, every for this model data are multiplied by seven and are seven-hole honeycomb tube structural molecule-electric induction type accelerometer model (front proof can think that each sky in seven apertures in the human head is identical).When other condition equal conditions (identical water based electrolyte, the identical outside temperature difference, identical multi-layer electrode structure) are identical, simulate the velocity field (Fig. 4 and Fig. 5) of two models and calculate the maximal rate (Fig. 6 and Fig. 7) of fluid field.
Because the molecular-electronics induction type accelerometer total current with honeycomb duct structure exports the integration equaling each aperture cavity, therefore himself noise equals the self-noise integration of each aperture cavity.Can know from Fig. 4 and Fig. 5 and find out, in same time, single cylindrical reaction cavity is owing to having larger electrolyte flow space, so in convect h process, electrolytic solution easily produces huge turbulence noise in cavity.Fig. 6 and Fig. 7 two figure demonstrates further and adds seven-hole honeycomb tube post-acceleration meter velocity field maximal rate by original
be reduced to
, velocity distribution change comparatively is before comparatively steady, and the turbulence noise thus caused by velocity field also reduces thereupon.
With current molecular-electronics induction type accelerometer reaction chamber by compared with single cylindrical structure, positive role of the present invention is, honeycomb duct structural response chamber can reduce the flowing velocity not stationarity of electrolytic solution, and then suppress self turbulent phenomenon, therefore can reduce molecular-electronics induction type accelerometer self-noise, the existing molecular-electronics induction type accelerometer performance index of raising are very helpful.Seven-hole honeycomb tube is added to accelerometer noise reduction in order to verify, we measure the signal gain of the accelerometer adding seven-hole honeycomb tube structure acceleration meter and do not add seven-hole honeycomb tube structure respectively by adopting, by Data Comparison, finally determine the reduction effect of seven-hole honeycomb tube structure to accelerometer noise.Below measuring method (as Fig. 9): by signal generator to molecular-electronics induction type accelerometer coil incoming frequency and amplitude known sinusoidal voltage excitation
make to produce alternating magnetic field in coil, electromagnet in coil does the sinusoidal motion identical with input stimulus source signal frequency under this magnetic fields, electromagnet drives again molecular-electronics induction type accelerometer cavity to move, thus molecular-electronics induction type accelerometer is moved under excitation source signal frequency.Then by data acquisition equipment record accelerometer output voltage
, the gain of accelerometer under this frequency can be obtained divided by the effective value of pumping signal after obtaining accelerometer output voltage, change different driving source frequencies can try to achieve whole working frequency range under accelerometer gain.
,
be all sinusoidal signal, peak value is respectively
,
.Accelerometer output voltage signal collects computer end by NI data collecting card, computer runs LabVIEW program, and this program can calculate the peak-to-peak value of accelerometer output voltage signal.The peak-to-peak value outputed signal by the peak-to-peak value and signal generator that calculate accelerometer output voltage signal can obtain the gain of molecular-electronics induction type accelerometer under this frequency and magnitude excitation (Figure 10).Can be found out by Figure 10, in below frequency 10Hz excitation, the signal gain adding the accelerometer of seven-hole honeycomb tube structure is obviously higher than the accelerometer not adding seven-hole honeycomb tube structure.Therefore for same accelerometer, adding seven-hole honeycomb tube structure for the effect of accelerometer noise reduction is obviously.Above mathematical model and simulation result can set up the reaction cavity structure of molecular-electronics induction type accelerometer and the corresponding relation of self-noise.Compared with existing single cylindrical reaction cavity body structure, honeycomb duct structure better can inhibit the self-noise of molecular-electronics induction type accelerometer.
The making of honeycomb duct:
According to Fig. 8 size, PVC material is used to manufacture seven apertures in the human head or nine hole honeycomb ducts;
Honeycomb duct is cut into the segment that length is 10mm, error range is less than 0.3mm;
Be that the seven-hole honeycomb tube of 10mm is put in the cylindrical reaction chamber of molecular-electronics induction type accelerometer by length, make its one end and cylindrical reaction chamber paste a section of sensitive chip to align, as shown in Figure 3, and between honeycomb duct and cylindrical reaction chamber, use marine glue to bond, and reach the intensity of anti-2g impact;
The assembling of molecular-electronics induction type accelerometer is completed according to existing assembling molecular-electronics induction type accelerometer step.
Claims (2)
1. the application of honeycomb duct on molecular-electronics induction type accelerometer, is characterized in that: by honeycomb duct structure filling in molecular-electronics induction type accelerometer reaction chamber, use waterproof strong glue bond between honeycomb duct and reaction chamber right cylinder.
2. the verification method of application described in claim 1, is characterized in that: adopt multiple physical field emulation technology to carry out modeling and simulating to honeycomb duct structural molecule-electric induction type accelerometer, and realistic model adopts Comsol Multiphysics multiple physical field emulation platform;
The effect of ion migration of molecular-electronics induction type accelerometer reaction chamber electrolyte inside is described by Nernst-Plank equation, and equation is as follows:
Wherein,
it is current density;
,
with
it is the coefficient of diffusion of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
,
with
represent the concentration of Triiodide ion in electrolytic solution, iodide ion and potassium ion;
represent the electric potential difference between anode and cathode;
it is velocity; F is Faraday constant;
it is gas constant;
The electrolyte movement of molecular-electronics induction type accelerometer reaction chamber is described by Navier-Stokes equation, and equation is as follows:
Wherein,
for the time;
for density of electrolyte;
for electrolytic solution viscosity;
for the acceleration of extraneous vibration excitation;
The relation of the ion concentration-electric current on molecular-electronics induction type accelerometer sensitive element is described by Butler-Volmer equation, and equation is as follows:
Wherein,
it is electrode surface normal vector parameter;
with
it is the reaction constant of anode and cathode; N=1 is the electrically charged number of band point ion;
being 0.5, is the conversion coefficient of electrodic electron and electric charge; U is voltage added between anode and cathode;
it is the equilibrium potential of electrochemical reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510168532.0A CN104793013A (en) | 2015-04-12 | 2015-04-12 | Application of honeycomb duct in molecule-electron induction accelerometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510168532.0A CN104793013A (en) | 2015-04-12 | 2015-04-12 | Application of honeycomb duct in molecule-electron induction accelerometer |
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| CN201510168532.0A Pending CN104793013A (en) | 2015-04-12 | 2015-04-12 | Application of honeycomb duct in molecule-electron induction accelerometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807092A (en) * | 2016-03-21 | 2016-07-27 | 吉林大学 | Method for designing molecule-electron induction type accelerometer elastic film element |
| CN109188012A (en) * | 2018-11-15 | 2019-01-11 | 中国兵器工业集团第二四研究所苏州研发中心 | A kind of micro- stop configurations of honeycomb |
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| CN1985178A (en) * | 2004-05-21 | 2007-06-20 | 麦特科技公司 | Convective accelerometer |
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| JP2012253082A (en) * | 2011-05-31 | 2012-12-20 | Japan Science & Technology Agency | Three-dimensional structure and sensor |
| CN104298890A (en) * | 2014-10-29 | 2015-01-21 | 吉林大学 | Installation dip angle compensation algorithm for molecular-electronic induction type accelerometer |
| CN104329325A (en) * | 2014-10-22 | 2015-02-04 | 无锡杰尔压缩机有限公司 | Flow stabilizing device for air intake of fan |
| CN104409072A (en) * | 2014-10-29 | 2015-03-11 | 吉林大学 | Noise reduction method for molecule-electronics induction type linear speedometer based on heat conduction structure |
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2015
- 2015-04-12 CN CN201510168532.0A patent/CN104793013A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985178A (en) * | 2004-05-21 | 2007-06-20 | 麦特科技公司 | Convective accelerometer |
| CN101918902A (en) * | 2007-12-14 | 2010-12-15 | 卡梅伦国际有限公司 | The turbulence conditioner and the method that are used for transit time ultrasonic flow meters |
| JP2012253082A (en) * | 2011-05-31 | 2012-12-20 | Japan Science & Technology Agency | Three-dimensional structure and sensor |
| CN104329325A (en) * | 2014-10-22 | 2015-02-04 | 无锡杰尔压缩机有限公司 | Flow stabilizing device for air intake of fan |
| CN104298890A (en) * | 2014-10-29 | 2015-01-21 | 吉林大学 | Installation dip angle compensation algorithm for molecular-electronic induction type accelerometer |
| CN104409072A (en) * | 2014-10-29 | 2015-03-11 | 吉林大学 | Noise reduction method for molecule-electronics induction type linear speedometer based on heat conduction structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807092A (en) * | 2016-03-21 | 2016-07-27 | 吉林大学 | Method for designing molecule-electron induction type accelerometer elastic film element |
| CN109188012A (en) * | 2018-11-15 | 2019-01-11 | 中国兵器工业集团第二四研究所苏州研发中心 | A kind of micro- stop configurations of honeycomb |
| CN109188012B (en) * | 2018-11-15 | 2024-02-02 | 中国兵器工业集团第二一四研究所苏州研发中心 | Honeycomb micro-stop structure |
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Application publication date: 20150722 |
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