CN209927886U - Fiber bragg grating acceleration sensor for monitoring acceleration of ship body - Google Patents
Fiber bragg grating acceleration sensor for monitoring acceleration of ship body Download PDFInfo
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- CN209927886U CN209927886U CN201920906636.0U CN201920906636U CN209927886U CN 209927886 U CN209927886 U CN 209927886U CN 201920906636 U CN201920906636 U CN 201920906636U CN 209927886 U CN209927886 U CN 209927886U
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Abstract
The utility model relates to a fiber grating acceleration sensor for monitoring with higher speed of hull, it mainly comprises sensor housing, sensor housing lid, the sensitive device of sensor, symmetry double hinge structure etc.. The two grating areas of the pre-tensioned optical fiber are respectively stuck between the mass blocks at the left end and the right end by using epoxy resin adhesive, the optical fiber is connected to the transmission optical cable by a watertight flange, and the acceleration value of the hull structure is displayed at the demodulator end in the form of the wavelength change of the optical fiber grating. The utility model discloses utilize the watertight flange, integrated into one piece aluminum alloy structure shell and outer cover have improved the water proofness and the stability of system, can be used to in the abominable service environment. The sensor can dynamically measure the acceleration value of a hull structure, eliminate the influence of temperature on the fiber bragg grating and ensure the reliability and durability of the sensor in the application of the marine field.
Description
Technical Field
The utility model belongs to the technical field of the fiber grating sensor, a marine vessel structure acceleration measurement is related to. More particularly, to a fiber grating acceleration sensor for monitoring the acceleration of a ship body.
Background
In the field of navigation, due to too much uncertainty at sea, the motion state of a ship body is extremely complex due to the impact of wind waves, and the impact of weapon launching, especially slamming loads, is also required to be considered on a naval vessel, and the factor mainly causes the vertical direction acceleration of the ship. The slamming vibration of the ship body is caused by the reasons of weapon firing, explosion impact, ship body collision, wave slamming and the like of the ship, the wave load of the ship body is one of slamming loads, is the load caused by the impact of water flow or wind wave when the ship sails in rivers or oceans, and has strong randomness. Because the slamming load acts on the ship body for a short time, the displacement load disappears as soon as the ship body generates, the traditional acceleration sensor adaptive to the ship body cannot directly detect the vibration response of the ship body under the slamming load, and the use of the acceleration sensor can count the vibration size, the vibration frequency and the vibration generation position.
The fiber bragg grating acceleration sensor for monitoring the acceleration of the ship body is characterized in that the fiber bragg grating acceleration sensor is arranged in the ship body structure, so that the acceleration of the ship body structure is automatically monitored, real and reliable data are provided for decision makers on ships, scientific basis is provided for ensuring the safety of the ship body, and the safety performance is improved.
Disclosure of Invention
The utility model aims at providing a hull is with higher speed fiber grating acceleration sensor design of monitoring, and the grating acceleration sensor who adopts the design of symmetry double hinge has better frequency response and higher sensitivity, realizes the real-time supervision of ship structure acceleration.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
a fiber grating acceleration sensor for monitoring acceleration of a ship hull, the sensor system comprising: the sensor comprises a sensor shell 8, a sensor shell cover 3, an acceleration sensor sensitive device and a symmetrical double-hinge structure.
Wherein the sensor housing 8 is formed by processing steps of cutting, polishing, oxidizing and the like of aluminum alloy, and the watertight flange 2 is arranged on the side surface of the sensor housing 8 without the process of splicing and welding. The periphery of the sensor shell cover 3 is provided with a sealing groove, a sealing strip is embedded in the sealing groove, the sensor shell cover 3 is provided with a shell cover fixing hole 7, and the sensor shell cover 3 is sealed with a sensor shell 8 through a fixing screw.
The sensitive device of the acceleration sensor consists of a pre-stretched 2nm optical fiber 1 which is connected with a first grating 5 and a second grating 10 with two different wavelengths in series and a temperature compensation grating 12. Two grating areas of the fiber grating are respectively stuck between the upper end and the lower end of the left mass block 4 and the right mass block 6 by epoxy resin adhesives and are connected to a transmission optical cable by a watertight flange 2.
The symmetrical double-hinge structure is a differential symmetrical hinge structure, is made of a whole piece of beryllium bronze, and is an integral model after linear cutting and processing. The device comprises a base 11, a base fixing hole 9, a flexible hinge 13 and a mass block 4. The mass 4 is connected to the base 11 by means of a flexible hinge 13, the base 11 being directly connected to the sensor housing 8 by means of fixing screws.
Fiber grating acceleration sensor's that monitoring is quickened to hull characterized in that:
(1) the fiber bragg grating acceleration sensor for monitoring the acceleration of the ship body is fixed on a ship by a sensor shell 8 and used for measuring the acceleration value of the ship body.
(2) The main body parts of the acceleration sensor sensitive device, the symmetrical double-hinge structure and the like are sealed and protected by a sealing device consisting of a sensor shell cover 3 and a sensor shell 8, so that the water tightness and the damage resistance of a sensor system are improved, and the stable work of the fiber grating acceleration sensor is ensured.
The utility model further discloses a hull is optical fiber grating acceleration sensor's application method who monitors with higher speed, its characterized in that:
(1) the sealed sensor is fixed at the bow position of the ship body, the optical fiber inside the sensor is led out through the watertight flange 2 and connected to the transmission optical cable of the ship body, and finally the acceleration value of the ship body structure can be observed in real time at the demodulator end.
(2) The sensor utilizes integrated into one piece aluminum alloy structure and sealed lid, has improved the water proofness and the stability of system. The use of watertight flange 2 can promote the anticorrosive performance of sensor, reduces the short circuit and opens the condition that takes place, improves the measurement accuracy of system, the later maintenance of being convenient for.
The utility model discloses more detailed description is as follows:
the sensitive device of the acceleration sensor consists of a pre-stretched 2nm optical fiber 1 which is connected with a first grating 5 and a second grating 10 with two different wavelengths in series and a temperature compensation grating 12. The two grating regions of the fiber grating are respectively adhered between the upper and lower ends of the left and right masses 4 and 6 using epoxy adhesive (commercially available) and connected to the transmission cable by the watertight flange 2. The deformation of the fiber bragg grating and the wavelength change of the fiber bragg grating are basically in a linear relation, the wavelength obtained through a compensation algorithm at the demodulator end is changed in proportion to the acceleration value of the ship structure, and finally the acceleration value of the ship structure is displayed at the demodulator end in the form of the wavelength change of the fiber bragg grating.
The periphery of the sensor shell cover 3 is provided with a sealing groove, a sealing strip is embedded in the sealing groove, the sensor shell cover 3 is provided with a shell cover fixing hole 7, and the sensor shell cover is in sealing connection with the sensor shell 8 through a fixing screw, so that the water tightness and the stability of the system are improved.
The utility model discloses a further use of fiber grating acceleration sensor application method for monitoring with higher speed of hull is being used for hull structure acceleration value automatic monitoring aspect is disclosed. The results of the simulation experiments show that the sensitivity of the sensor is 524 pm/g in the frequency range of 0-100 Hz.
The utility model discloses mainly solved the measurement problem of fiber grating sensor acceleration value under the adverse circumstances, the sensitivity and the frequency response of fiber grating sensor have mainly been investigated, and main difficult point lies in the stability and the water proofness of fiber grating sensor system.
The utility model discloses a positive effect that is used for fiber grating acceleration sensor of hull monitoring with higher speed and application and compares to have with prior art lies in:
(1) the fiber bragg grating acceleration sensor for monitoring the acceleration of the ship body is designed, and has good water tightness, good frequency response and high sensitivity according to the requirements of the working environment of the ship body.
(2) The sensitivity of the sensor can be greatly enhanced by using the symmetrical double-hinge structure, and the range of the sensor for measuring the acceleration of the ship body is enlarged.
(3) To abominable operating condition such as ocean humidity, surge, the utility model discloses utilize aluminum alloy structure shell and outer cover, guaranteed durability and the reliability that hull acceleration rate value measuring fiber grating acceleration sensor used in the ocean field.
Drawings
FIG. 1 is a schematic structural view of a fiber grating acceleration sensor for monitoring acceleration of a ship body according to the present invention;
in the figure: 1-optical fiber, 2-watertight flange, 3-sensor shell cover, 4-left mass block, 5-first grating, 6-right mass block, 7-shell cover fixing hole, 8-sensor shell, 9-base fixing hole, 10-second grating, 11-base, 12-temperature compensation grating and 13-flexible hinge.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. Additionally, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes and modifications can be made in these embodiments without departing from the spirit and scope of the invention. The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
The fiber bragg grating acceleration sensor for monitoring the acceleration of a ship body is characterized by comprising the following components: the sensor comprises a sensor shell 8, a sensor shell cover 3, an acceleration sensor sensitive device and a symmetrical double-hinge structure. Wherein the sensor shell 8 is formed by one-time processing of aluminum alloy through steps of cutting, polishing, oxidation and the like, and is not subjected to the process of splicing and welding, and the side surface of the sensor shell 8 is provided with the watertight flange 2. The periphery of the sensor shell cover 3 is provided with a sealing groove, a sealing strip is embedded in the sealing groove, the sensor shell cover 3 is provided with a shell cover fixing hole 7, and the sensor shell cover is connected with the sensor shell 8 in a sealing mode through a fixing screw.
The sensitive device of the acceleration sensor consists of a pre-stretched 2nm optical fiber 1 which is connected with a first grating 5 and a second grating 10 with two different wavelengths in series and a temperature compensation grating 12. Two grating areas of the fiber grating are respectively stuck between the upper end and the lower end of the left mass block 4 and the right mass block 6 by epoxy resin adhesives and are connected to a transmission optical cable by a watertight flange 2.
The symmetrical double-hinge structure is a differential symmetrical hinge structure, is made of a whole piece of beryllium bronze, and is an integral model after linear cutting and processing. The sensitivity of the sensor can be greatly enhanced by using the symmetrical double-hinge structure, and the acceleration range of the ship structure measured by the sensor is improved.
Example 2
The using method comprises the following steps:
(1) the sealed sensor is fixed at the bow position of the ship body, the optical fiber inside the sensor is led out through the watertight flange 2 and connected to the transmission optical cable of the ship body, and finally the acceleration value of the ship body structure can be observed in real time at the demodulator end.
(2) The sensor utilizes integrated into one piece aluminum alloy structure and sealed lid, has improved the water proofness and the stability of system. The use of watertight flange 2 can promote the anticorrosive performance of sensor, reduces the short circuit and opens the condition that takes place, improves the measurement accuracy of system, the later maintenance of being convenient for.
(3) The acceleration value of the ship structure is displayed at the demodulator end in the form of the wavelength change of the fiber bragg grating, the deformation of the fiber bragg grating and the wavelength change of the fiber bragg grating are basically in a linear relation, and the wavelength and the acceleration value of the ship structure are finally obtained through a compensation algorithm at the demodulator end.
Example 3
The influence of temperature on the acceleration measurement of a ship body structure is eliminated by using a reference grating method, the temperature measurement is realized by using a grating which is not affected by strain, and the grating is welded to a sensitive device of an acceleration sensor and is placed in the sensor. Once the sensor is packaged, the variation of the central wavelength of the fiber grating is not influenced by temperature and is only related to the strain wavelength drift caused by the acceleration change of the ship body, so that the fiber grating sensor with the temperature self-compensation function is realized.
Example 4
The utility model belongs to a hinge-L type structure, the hypothesisf 0Is the natural frequency;is the angular frequency of the vibration source;
is the natural angular frequency;is a frequency ratio;
is the damping ratio; a is the vibration acceleration, and the vibration amplitude of the mass block is known from the principle of elastic mechanics as follows:
according to the geometric relationship of the structure, the maximum rotation angle of the inertial mass part under the action of external acceleration excitation is
During vibration, the axial length variation of the FBG structurally adhered is:
substituting the axial length variation formula of the FBG into the relative variation formula of the center wavelength of the fiber bragg grating can obtain the relative wavelength variation as follows:
defining the response sensitivity S of the center wavelength to the acceleration as the ratio of the wavelength variation to the acceleration, namely:
then under the action of the external excitation signal, the sensitivity of the sensor is:
when the external stimulus f < < f0 is assumed, the acceleration sensor of the utility model has the acceleration response sensitivity in the ideal flat area as follows:
the simulation result shows that:
the sensitivity of the sensor in the frequency range of 0-100 Hz is 524 pm/g after calculation.
Claims (2)
1. A fiber grating acceleration sensor for monitoring the acceleration of ship body is characterized by comprising: the sensor comprises a sensor shell (8), a sensor shell cover (3), an acceleration sensor sensitive device and a symmetrical double-hinge structure;
the sensor shell (8) is formed by aluminum alloy in one step, a watertight flange (2) is arranged on the side face of the sensor shell, a sealing groove is formed in the periphery of a sensor shell cover (3), a sealing strip is embedded in the sealing groove, a shell cover fixing hole (7) is formed in the sensor shell cover, and the sensor shell (8) is sealed through a fixing screw;
the acceleration sensor sensitive device is composed of a pre-stretched 2nm optical fiber (1) which is connected with a first grating (5) and a second grating (10) with two different wavelengths in series and a temperature compensation grating (12), wherein two grating areas of the optical fiber are respectively stuck between the upper end and the lower end of a left mass block (4) and a right mass block (6) by using epoxy resin adhesives and are connected to a transmission optical cable by a watertight flange (2);
the symmetrical double-hinge structure is a differential symmetrical hinge structure, and an integral model is manufactured by machining a whole piece of beryllium bronze through wire cutting; the device comprises a base (11), a base fixing hole (9), a flexible hinge (13) and a mass block (4); the mass (4) is connected to a base (11) by means of a flexible hinge (13), the base (11) being connected directly to the sensor housing cover (3).
2. The fiber bragg grating acceleration sensor for ship hull acceleration monitoring according to claim 1, characterized in that the sensor housing cover (3) is made of aluminum alloy through cutting, grinding and oxidation steps in one step.
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| CN201920906636.0U CN209927886U (en) | 2019-06-17 | 2019-06-17 | Fiber bragg grating acceleration sensor for monitoring acceleration of ship body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110108901A (en) * | 2019-06-17 | 2019-08-09 | 天津师范大学 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110108901A (en) * | 2019-06-17 | 2019-08-09 | 天津师范大学 | Accelerate fiber grating acceleration sensor and the application of monitoring for hull |
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