CN116026369B - Light path rigid-flexible hybrid assembly method in fiber-optic gyroscope inertial navigation system - Google Patents
Light path rigid-flexible hybrid assembly method in fiber-optic gyroscope inertial navigation system Download PDFInfo
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Abstract
The invention belongs to the technical field of manufacturing of optical fiber gyro inertial navigation system equipment, and particularly relates to a rigid-flexible hybrid assembly method of an optical path in an optical fiber gyro inertial navigation system, which comprises the steps of firstly, determining a proper bonding point through three-dimensional modeling of a structural body of the optical fiber gyro inertial navigation system; optimizing parameters of the adhesive colloid, and determining optimal colloid design parameters; and selecting an adhesive colloid with optimal colloid design parameters, and fixing the optical fiber tail fiber on a structural body of the optical fiber gyro inertial navigation system at the adhesive point. The method prevents the damage of the fiber tail fiber of the fiber-optic gyroscope inertial navigation system in the assembly process, improves the reliability of assembly, reduces the assembly difficulty, particularly reduces the influence on the navigation precision of the fiber-optic gyroscope inertial navigation system due to the assembly of the fiber tail fiber, and ensures the process reliability under the combined action of multiple coupling environments.
Description
Technical Field
The invention belongs to the technical field of manufacturing of optical fiber gyro inertial navigation system equipment, and particularly relates to a rigid-flexible hybrid assembly method for optical paths in an optical fiber gyro inertial navigation system.
Background
The fiber-optic gyroscope inertial navigation system is an inertial navigation system taking the fiber-optic gyroscope inertial navigation system as a core sensitive element, and has the advantages of high reliability, impact vibration resistance, long service life, high starting speed and the like, so that the fiber-optic gyroscope inertial navigation system is widely applied to a plurality of military and civil fields. In the research and development process of the inertial navigation system, we find that the total unit has high requirements on volume and weight besides the explicit requirements on the navigation precision of the inertial navigation system. In order to improve the core competitiveness of the fiber-optic gyroscope inertial navigation system, smaller volume and lighter weight are required to be realized on the premise of ensuring the navigation precision of the system. Therefore, an integrally designed inertial navigation system of the fiber-optic gyroscope inertial navigation system is generated. The integrated fiber optic gyroscope inertial navigation system breaks the strict physical limit between the traditional gyroscope and the system, cancels the structural body of the traditional single-axis fiber optic gyroscope inertial navigation system, and directly assembles various optical devices and circuit boards in the fiber optic gyroscope inertial navigation system onto the gyroscope platform body. But with the great difficulty of the system assembly process.
The optical device of the fiber optic gyro inertial navigation system comprises a light source, a coupler, a Y waveguide, a fiber optic ring and a detector, wherein the fiber optic ring is connected with the Y waveguide, the Y waveguide is connected with the coupler, the coupler receives signals of the light source and the detector, the structure of the typical fiber optic gyro inertial navigation system is not available, various optical devices can only be dispersed in scattered assembly spaces of all the surfaces of the structure of the fiber optic gyro inertial navigation system, the distance between the devices is increased, the devices are connected by only fiber optic fusion, the whole fiber distribution process is long in distance and high in difficulty, and the fiber optic also needs to be overturned between different planes, such as the fact that unnecessary damage is easily caused by improper treatment, and the reliability of the assembly process is reduced.
The fixation between the fiber tail fiber and the structure body of the fiber-optic gyroscope inertial navigation system in the device belongs to a rigid-flexible mixed assembly process, at the present stage, the fiber is generally fixed on the structure body directly by adopting a solidified colloid, the fiber is influenced by adhesive force in the assembly process, the change of the light transmission parameters can be caused, the optical path is damaged and ascended due to overlarge adhesive force, the navigation precision of the system is influenced, the assembly reliability is reduced due to overlarge adhesive force, the detachment phenomenon of an adhesive point occurs in the long-time use process of the system, and the integral use reliability of the system is reduced. In addition, various parameters of the adhesive colloid can also influence the performance and reliability of the adhesive point, because the adhesive is generally carried out at normal temperature, but the adhesive point and the fiber-optic gyroscope inertial navigation system can be subjected to high and low temperature operation together, and the adhesive performance can be influenced by experimental environmental conditions. In addition, since bonding is performed on each mounting surface of the three-dimensional structure of the optical fiber gyro inertial navigation system, the selection of the bonding position point also affects the performance of the bonding point. Therefore, in order to improve the performance of the rigid-flexible hybrid assembly process, the multi-parameter matching relation between the adhesive colloid and the optical fiber and the structural body needs to be selected, and the selection of the adhesive position points is subjected to special research and process reliability test.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects in the prior art, providing an assembly method, preventing the fiber tail fiber of the fiber-optic gyroscope inertial navigation system from being damaged in the assembly process, improving the reliability of the fiber-optic gyroscope inertial navigation system, particularly reducing the influence on the precision of the fiber-optic gyroscope inertial navigation system due to the assembly of the fiber tail fiber, and ensuring the process reliability under the combined action of multiple coupling environments.
The invention is realized by the following technical scheme:
the invention provides a rigid-flexible mixed assembly method of optical paths in an optical fiber gyro inertial navigation system, which is characterized in that an optical fiber tail fiber in the optical fiber gyro inertial navigation system is fixed on a structural body of the optical fiber gyro inertial navigation system by using an adhesive colloid, and comprises the following steps:
s1, determining a proper bonding point through three-dimensional modeling of a structural body of an optical fiber gyro inertial navigation system;
s2, optimizing parameters of the adhesive colloid, and determining optimal colloid design parameters;
s3, selecting an adhesive colloid with optimal colloid design parameters, and fixing the optical fiber tail fiber on a structural body of the optical fiber gyro inertial navigation system at the adhesive point.
The method for completing the step S1 provided by the invention comprises the following steps:
s11, determining the routing direction of the optical fiber tail fiber according to the connection sequence between optical devices of the optical fiber gyro inertial navigation system and the rigid assembly position of the optical devices in the optical fiber gyro inertial navigation system, wherein the rigid assembly is formed by fixedly connecting the optical devices in the optical fiber gyro inertial navigation system with structural bodies of the optical fiber gyro inertial navigation system in a threaded manner;
s12, determining contact surfaces of optical fibers passing through a structural body of the fiber-optic gyroscope inertial navigation system in the routing direction of the fiber-optic pigtail, and arranging at least one bonding point position on each contact surface.
According to the step S11 provided by the invention, the connection sequence among the optical devices of the fiber-optic gyroscope inertial navigation system is as follows: the light source is connected with the coupler, the coupler is connected with the Y waveguide, the Y waveguide is connected with the optical fiber ring, and finally the coupler is connected with the detector.
In the step S12 provided by the invention, the bonding point is not coincident with the fiber pigtail bonding point.
The method for completing the step S2 provided by the invention comprises the following steps:
s21, fixing the optical fiber on a test board through an adhesive colloid, placing the test board into a temperature, humidity and vibration comprehensive test box, and under the combined action of the temperature, the humidity and the vibration, performing a stress application test on the optical fiber along the tangential direction of the optical fiber, and determining the maximum value of additional stress of the optical fiber under the condition of multiple physical coupling by taking the change of the transmission loss of the optical fiber before and after the stress application as a boundary condition
At this time->
The method comprises the following steps of: />
=/>
Wherein->
For coupling the tangential stress of the optical fiber caused by environmental stress, and +.>
The initial adhesion force under the boundary condition is ensured to be less than or equal to the change of the optical fiber loss;
s22, adopting a multi-element nonlinear regression method, and when the test adhesion approaches
And determining optimal colloid design parameters according to the correlation between the colloid modulus, poisson's ratio, density, specific heat, thermal expansion coefficient and thermal conductivity parameters and the adhesive force.
According to the invention, the method comprises the following steps:
s221, firstly constructing a database with adhesive force as a dependent variable, colloid modulus, poisson ratio, density, specific heat, thermal expansion coefficient and thermal conductivity as independent variables through test data;
s222, analyzing the correlation between the independent variable and the dependent variable in S221: utilizing a spearman correlation coefficient to analyze the correlation between each variable and the dependent variable by using minitab software;
s223, through the correlation analysis of the step S222, a model is built as follows
In the formula (I)
Is constant, n=6, is the number of independent variables, +.>
Representing first order function coefficients,/>
Representing the single argument and +.>
Relation between->
Is of the second orderFunction coefficient->
Representing the interaction between independent variables two by two or the square pair of single independent variables for the second order function>
Directly substituting the test data of the database of step S221 into the formula, wherein +.>
Substituting the dependent variable data can determine the optimal independent variable value, thereby obtaining the optimal colloid design parameter.
According to the optical fiber tangential stress caused by coupling environmental stress in the step S21 provided by the invention
The determination method is that the optical fiber is measured by optical coherence domain polarization detection (OCDP) equipment under the conditions of temperature, humidity and vibration physical field coupling test without applying external force, and the optical fiber is obtained through conversion.
The beneficial effects of the invention are as follows:
the invention prevents the damage of the fiber tail fiber of the fiber-optic gyroscope inertial navigation system in the assembly process, improves the reliability of assembly, reduces the assembly difficulty, particularly reduces the influence on the navigation precision of the fiber-optic gyroscope inertial navigation system due to the assembly of the fiber tail fiber, and ensures the process reliability under the combined action of multiple coupling environments.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments, so that those skilled in the art can better understand the technical aspects of the present invention.
The optical fiber gyro inertial navigation system is regarded as an integrated system, and all light path assembly operations in the optical fiber gyro inertial navigation system are finely classified according to the integrated system composition. The method is divided into a rigid assembly, a flexible assembly and a rigid-flexible mixed assembly. Wherein the rigid assembly comprises: various optical devices and couplers in various gyro light sources, Y waveguide and optical fiber ring assemblies are mechanically fixedly connected with a structural body, and flexible assembly comprises: adopt the optical fiber fusion between above-mentioned all kinds of optical devices, realize complete light path structure, rigid and flexible mixed assembly: after the optical fiber fusion is finished, the optical fiber pigtail is fixed on a system structural body by using an adhesive colloid, so that the influence of various environmental adaptations on optical path signals is reduced, and the optical fiber pigtail is typically rigid-flexible mixed assembly. The optical path assembly sequence in the optical fiber gyro inertial navigation system is that rigid assembly is firstly carried out, then flexible assembly is carried out, and finally rigid-flexible mixed assembly is carried out.
For the bonding rigid-flexible mixed operation between the optical fiber and the structural member (the optical fiber is bonded to the structural body through the thermosetting bonding colloid), firstly, a suitable bonding point is found through three-dimensional modeling of the triaxial structural body, the physical distance between devices is mainly comprehensively considered, the optical fiber tail fiber is coiled, the front-back interference phenomenon cannot occur in the fiber running operation process, the current parts to be mounted and the previously mounted parts are prevented from being involved in collision, the assembly quality and efficiency are improved, the bonding force is analyzed, the coupling conditions such as temperature and humidity, vibration impact and the like are combined for test verification, and the conventional bonding colloid parameters can be optimized on the basis.
a) According to the connection sequence of optical devices of the fiber-optic gyroscope inertial navigation system (firstly, a light source is connected with a coupler, then the coupler is connected with a Y waveguide, the Y waveguide is connected with an optical fiber ring, and finally, the coupler is connected with a detector. ) Determining the routing direction of the fiber pigtail with the rigid assembly position of the device,
b) And determining contact surfaces of the optical fibers passing through a structural body of the optical fiber gyro inertial navigation system in the wiring direction, and at least ensuring that each contact surface is provided with an adhesive point position, wherein the adhesive point position needs to avoid the fusion point position of the tail optical fibers of the optical fibers.
C) The parameter optimization method of the adhesive colloid comprises the following steps: the parameter optimization aims to seek to ensure the maximum adhesive force under the precondition of not influencing the transmission loss of the optical fiber under the multi-physical field coupling effect. Firstly, placing the optical fiber into a three-combination test box, and under the combined action of temperature, humidity and vibration, applying stress application test along the tangential direction of the optical fiber to make the optical fiber undergo the action of front and rear light for stress applicationDetermining the maximum value of additional stress of optical fiber under the condition of multiple physical couplings by taking the change of the transmission loss of the optical fiber being more than 10% as a boundary condition
. Since the test is carried out under multiphysics coupling conditions, +.>
Can be decomposed into: />
=/>
Wherein->
For coupling the tangential stress of the optical fiber caused by environmental stress, and +.>
The initial adhesion is maintained to ensure that the fiber loss varies no more than the boundary conditions. Wherein->
The optical fiber can be measured by an optical coherence domain polarization detection (OCDP) device under the condition of multiple physical field coupling test without applying external force, and can be obtained by conversion: the optical coherence domain polarization detection (OCDP) equipment is connected to one section of the optical fiber to be detected, multiple physical field coupling is applied to the optical fiber to be detected, so that the polarization crosstalk suffered by the optical fiber can be obtained through the optical coherence domain polarization detection (OCDP), and the tangential stress suffered by the optical fiber can be converted according to the relationship between the polarization crosstalk and tangential stress obtained in the past test. Therefore, the +.>
。
Unlike traditional research, the method has no requirement for adhesion force, but needs actual adhesion force to approach more
But cannot exceed +.>
Is obtained by long-term test>
About 20Mpa.
Because the epoxy resin adhesive colloid material is basically adopted for bonding the optical fiber and the metal, but no existing expression exists between the adhesive force and colloid physical and chemical parameters, a multi-element nonlinear regression method can be adopted to study the approach of the adhesive force
And in the process, the correlation and optimal value of the parameters such as colloid modulus, poisson ratio, density, specific heat, thermal expansion coefficient, thermal conductivity and the like and the adhesive force are obtained.
The specific method comprises the following steps:
a) Firstly, a statistical database which takes adhesive force as a dependent variable, colloid modulus, poisson ratio, density, specific heat, thermal expansion coefficient and thermal conductivity as independent variables is constructed according to the experience of the prior test. And respectively calculating the maximum value, the minimum value and the median value of the respective variables of the colloid modulus, the poisson ratio, the density, the specific heat, the thermal expansion coefficient and the thermal conductivity in the database according to the data in the database.
The relevant experiments constituting the database are as follows:
b) The correlation between the self-variable data and the dependent variable is analyzed: and (3) analyzing the correlation between each variable and the dependent variable by utilizing the spearman correlation coefficient and adopting minitab software.
c) On the basis of which a model is built as follows
In the middle of
Is constant, n=the number of independent variables, +.>
Representing first order function coefficients,/>
As a first order function, represents a single independent variable and +.>
Relation between->
Is a second order function coefficient>
As a second order function, the interaction between independent variables or the square pair of independent variables are expressed>
The influence of the parameter index system is that the value is directly related to the test data of the database, and the optimal independent variable value can be determined by utilizing the above formula, so that the optimal colloid design parameter index system range is obtained. />
By analyzing the assembly method, the method is optimized for the optical path assembly of the integrated optical fiber inertial navigation system, so that the damage of the optical fiber tail fiber of the optical fiber gyro inertial navigation system in the assembly process is prevented, the assembly reliability is improved, the assembly difficulty is reduced, particularly, the influence on the navigation precision of the optical fiber gyro inertial navigation system due to the assembly of the optical fiber tail fiber is reduced, and the process reliability under the combined action of multiple coupling environments is ensured.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The rigid-flexible hybrid assembly method for the optical path in the fiber-optic gyroscope inertial navigation system is characterized by comprising the following steps of:
s1, determining a proper bonding point through three-dimensional modeling of a structural body of an optical fiber gyro inertial navigation system;
s2, optimizing parameters of the adhesive colloid, and determining optimal colloid design parameters;
s3, selecting an adhesive colloid with optimal colloid design parameters, and fixing the fiber tail on a structural body of the fiber-optic gyroscope inertial navigation system at the adhesive point;
wherein the completion of step S2 requires the following steps:
s21, fixing the optical fiber on a test board through an adhesive colloid, placing the test board into a temperature, humidity and vibration comprehensive test box, performing a stress application test on the optical fiber along the tangential direction of the optical fiber under the combined action of the temperature, the humidity and the vibration, and determining the maximum value of additional stress of the optical fiber under the condition of multiple physical coupling by taking the change of the transmission loss of the optical fiber before and after the stress application as a boundary condition
At this time->
The method comprises the following steps of: />
=/>
Wherein->
For coupling the tangential stress of the optical fiber caused by environmental stress
To ensure that the change of the optical fiber loss is less than or equal to the boundary stripInitial adhesion under the part;
s22, adopting a multi-element nonlinear regression method, and when the test adhesive force approaches
In the process, the correlation between the colloid modulus, poisson's ratio, density, specific heat, thermal expansion coefficient and thermal conductivity parameter and adhesive force is utilized to determine the optimal colloid design parameter;
wherein the completion of step S22 requires the following steps:
s221, firstly, constructing a database with adhesive force as a dependent variable, colloid modulus, poisson ratio, density, specific heat, thermal expansion coefficient and thermal conductivity as independent variables through test data;
s222, analyzing the correlation between the independent variable and the dependent variable in S221: utilizing a spearman correlation coefficient to analyze the correlation between each variable and the dependent variable by using minitab software;
s223, through correlation analysis in the step S222, a model is built as follows:
in the middle of
Is constant, n=6, is the number of independent variables, +.>
Representing first order function coefficients,/>
Representing the single argument and +.>
Relation between->
Is a second order function coefficient>
Representing the interaction between independent variables two by two or the square pair of single independent variables for the second order function>
Directly substituting the test data of the database of step S221 into the formula, wherein
Substituting the independent variable data to determine the optimal independent variable value and obtain the optimal colloid design parameter.
2. The method for assembling the rigid-flexible optical path in the inertial navigation system of the fiber-optic gyroscope according to claim 1, wherein the method for completing the step S1 comprises the following steps:
s11, determining the routing direction of the optical fiber tail fiber according to the connection sequence between optical devices of the optical fiber gyro inertial navigation system and the rigid assembly position of the optical devices in the optical fiber gyro inertial navigation system, wherein the rigid assembly is formed by fixedly connecting the optical devices in the optical fiber gyro inertial navigation system with structural bodies of the optical fiber gyro inertial navigation system in a threaded manner;
s12, determining contact surfaces of optical fibers passing through a structural body of the fiber-optic gyroscope inertial navigation system in the routing direction of the fiber-optic pigtail, and arranging at least one bonding point position on each contact surface.
3. The method for assembling rigid-flexible optical paths in an optical fiber gyro inertial navigation system according to claim 2, wherein in step S11, the connection sequence between the optical devices of the optical fiber gyro inertial navigation system is as follows: the light source is connected with the coupler, the coupler is connected with the Y waveguide, the Y waveguide is connected with the optical fiber ring, and finally the coupler is connected with the detector.
4. The method for rigid-flexible optical path hybrid assembly in an inertial navigation system of a fiber optic gyroscope according to claim 2, wherein in step S12, the bonding point is not coincident with the fiber optic pigtail bonding point.
5. The method for rigid-flexible optical path hybrid assembly in an inertial navigation system of a fiber optic gyroscope according to any one of claims 1-4, wherein the tangential stress of the fiber optic due to coupling environmental stress in step S21
The determination method is that the optical fiber is measured by an optical coherence domain polarization detection device under the conditions of temperature, humidity and vibration physical field coupling test under the condition that no external force is applied, and the optical coherence domain polarization detection device is obtained through conversion. />
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