CN-119803646-B - Magnetic fluid broadband based bidirectional micro-flutter angular velocity detection unit and method

CN119803646BCN 119803646 BCN119803646 BCN 119803646BCN-119803646-B

Abstract

The invention discloses a magnetic fluid broadband bidirectional micro-flutter angular velocity detection unit which comprises a top cover (1), a base (2), a cable assembly (3), two magnetic fluid sensors (4), a rear panel (5), a bracket assembly (7), a support (9) and a connector (10), wherein the two magnetic fluid sensors (4) are arranged on the inner wall of the base (2), sensitive axes of the two magnetic fluid sensors (4) are orthogonal and are correspondingly parallel to two axes of an installation coordinate system of the detection unit, and channels are independent and are used for detecting bidirectional micro-vibration information sources. The angular velocity detection unit provided by the invention realizes accurate measurement of the middle-high frequency bidirectional micro-vibration angular velocity by adopting the magnetic fluid sensor, provides effective auxiliary data reference for stable control of the airborne photoelectric nacelle, has a light and handy whole structure, compact layout and high reliability, and is provided with MEMS and an optical fiber gyro mechanical interface for realizing full-band micro-vibration angular velocity detection.

Inventors

SUN GUANQUN
NIE ZHOU
DU CHANG
LU WEILIANG
SHI RAN
WU CHENCHENG

Assignees

上海航天控制技术研究所

Dates

Publication Date: 20260508
Application Date: 20241226

Claims (2)

1. The magnetic fluid broadband bidirectional micro-flutter angular velocity detection unit is characterized by comprising a top cover (1), a base (2), a cable assembly (3), two magnetic fluid sensors (4), a rear panel (5), a bracket assembly (7), a support (9) and a connector (10), wherein: The two magnetic fluid sensors (4) are respectively arranged on two orthogonal inner wall planes of the cavity of the base (2), the sensitive axes of the two magnetic fluid sensors (4) are orthogonal and are correspondingly parallel to two axes of the installation coordinate system of the detection unit, and the channels are respectively independent and are used for detecting bidirectional micro-vibration information sources; the bracket component (7) is arranged above the two magnetic fluid sensors (4), is tightly connected with the inner wall of the cavity of the base (2) and forms a mutually supporting and restraining structure; The base (2), the top cover (1) and the rear panel (5) are in meshed and sealed connection through clamping grooves of the matching surfaces to form an outer wrapping whole of the angular speed detection unit; Two groups of four-point support bosses are arranged on the inner wall of the cavity of the base (2) and are used for realizing four-point support layout and orthogonal installation of two magnetic fluid sensors (4); the support boss is provided with a screw hole, and is used for fixedly connecting the magnetic fluid sensor (4) with the base (2) through a screw, and then further reinforcing and connecting the magnetic fluid sensor (4) with the base (2) through dispensing into the screw hole, so that the reliability of connection of the magnetic fluid sensor (4) with the base (2) is improved, the energy attenuation of an external vibration source transmitted to the sensor is reduced, and the accuracy of information detection is ensured; Glue storage grooves (19) are formed in the periphery of the support boss and used for storing glue which is liquefied and overflowed due to temperature change in the threaded holes, so that the situation that the glue flows between the magnetic fluid sensor (4) and the base (2) to cause weak deviation to extrusion of the magnetic fluid sensor (4) after the glue is cured again and influence the accuracy of the detection unit is avoided; The support assembly (7) comprises a power module (8), a support and an acquisition module (6), wherein the power module (8) is fixedly connected to the upper side of the support through a screw, the acquisition module (6) is fixedly connected to the lower side of the support through a screw, the power module (8) and the acquisition module (6) are in a positive and negative symmetrical integrated layout, and the bearing surfaces of the support, the power module (8) and the acquisition module (6) are of a structure with hollowed middle parts and locally enlarged screw joints for enhancing heat dissipation; The support assembly (7) is of an embedded design, six lap joint bosses and six support bosses are arranged on the peripheral outer side wall of the support assembly, the lap joint bosses are embedded into corresponding clamping grooves of the inner wall of the cavity of the base (2) to realize positioning and clamping during installation, the support bosses are propped against the inner wall of the cavity of the base (2), and a threaded blind hole is formed in the center of each support boss and used for fixedly connecting and locking the support assembly (7) and the base (2) through screws; The connector (10) adopts a stress transfer structure design, a support (9) is added between the connector (10) and a power module printed board, the support (9) is fixedly connected to the bracket assembly (7) through screws, and the four supporting legs of the support (9) divide welding spot stress equally, so that the transfer of the welding spot stress of the connector (10) from the printed board to the bracket assembly (7) is realized, and the reliability of welding spots is improved; the acquisition module (6) is provided with an interface of an MEMS gyroscope combination; the top cover (1) is provided with a mechanical interface of the fiber-optic gyroscope combination.
2. The method is characterized in that the angular velocity detection unit of claim 1 is used for accurately measuring the middle-high frequency bidirectional micro-vibration angular velocity of the airborne nacelle, and the data fusion is formed by further carrying a MEMS gyroscope or an optical fiber gyroscope in a combined form on the basis of the angular velocity detection unit, so that the full-band bidirectional micro-vibration angular velocity is detected.

Description

Magnetic fluid broadband based bidirectional micro-flutter angular velocity detection unit and method Technical Field The invention belongs to the field of vibration measurement of an aircraft nacelle, and particularly relates to a magnetic fluid-based broadband bidirectional micro-flutter angular velocity detection unit and method. Background The on-board photoelectric pod has been developed faster and faster in recent 10 years, and particularly, the on-board photoelectric pod has been widely paid attention to applications in aspects of investigation and alarm, target indication, control aiming, navigation tracking and the like. In the process of maneuvering an aircraft in the air, the photoelectric pod of the aircraft can be interfered by factors such as changeable carrier postures, complex flight environments and the like, so that the stable platform is unstable and shakes, and the working accuracy of the aircraft is affected. The adverse effect of the jitter interference can be eliminated by compensating and correcting the jitter interference, and the stable control of the photoelectric pod is realized. Accurate measurement of micro-angle vibration information of a stable platform is a key for realizing effective compensation and correction design, but because interference in the flying movement process has randomness and uncertainty, higher requirements are put on the sensitivity and reliability of a micro-angle vibration sensor. At present, a gyroscope is commonly used for measuring micro-angle vibration information, but the bandwidth range of a traditional gyroscope is narrow, high-frequency vibration information cannot be accurately measured, and accurate monitoring of the shaking condition of a stabilized platform of an electro-optic pod is difficult to realize. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide a magnetic fluid-based broadband bidirectional micro-flutter angular velocity detection unit and method, which are used for accurately monitoring the shaking condition of a stabilized platform in the flying movement process of a photoelectric pod, and providing effective auxiliary data for the anti-shaking of the stabilized platform for compensation and correction so as to realize the accurate positioning and gesture control of the stabilized platform. The specific technical scheme of the invention is as follows: The magnetic fluid broadband bidirectional micro-flutter angular velocity detection unit is characterized by comprising a top cover 1, a base 2, a cable assembly 3, two magnetic fluid sensors 4, a rear panel 5, a bracket assembly 7, a support 9 and a connector 10, wherein: The two magnetic fluid sensors 4 are respectively arranged on two orthogonal inner wall planes of the cavity of the base 2, the sensitive axes of the two magnetic fluid sensors 4 are orthogonal and are correspondingly parallel to two axes of the installation coordinate system of the detection unit, and the channels are respectively independent and are used for detecting bidirectional micro-vibration information sources; the bracket component 7 is arranged above the two magnetic fluid sensors 4, is fixedly connected with the inner wall of the cavity of the base 2 and forms a mutually supporting and restraining structure; The base 2, the top cover 1 and the rear panel 5 are engaged and sealed through clamping grooves of the matching surfaces to form an outer wrapping whole of the angular speed detection unit. Preferably, two groups of four-point support bosses are arranged on the inner wall of the cavity of the base 2 and are used for realizing four-point support layout and orthogonal installation of the two magnetic fluid sensors 4; The supporting boss is provided with a screw hole, and is used for fixedly connecting the magnetic fluid sensor 4 with the base 2 through a screw, and then the connection is further reinforced through dispensing into the screw hole, so that the reliability of connection between the magnetic fluid sensor 4 and the base 2 is improved, the energy attenuation of an external vibration source transmitted to the sensor is reduced, and the accuracy of information detection is ensured. Preferably, glue storage grooves 19 are formed in the periphery of the supporting boss and used for storing glue which is liquefied and overflowed in the threaded holes due to temperature change, so that the glue is prevented from flowing between the magnetic fluid sensor 4 and the base 2, and weak deviation is generated to the extrusion of the magnetic fluid sensor 4 after the glue is cured again, and the accuracy of the detection unit is affected. Preferably, the support assembly 7 comprises a power module 8, a support and an acquisition module 6, wherein the power module 8 is fixedly connected to the upper side of the support through a screw, the acquisition module 6 is fixedly connected to the lower side of the support through a screw, the power module 8 a