Projectile body attitude testing device based on accelerometer array

Abstract

The invention discloses a projectile body attitude testing device based on an accelerometer array, and aims to improve the precision and reliability of a projectile body attitude test in a high overload environment. The device comprises a storage circuit and an accelerometer array, a protection device is installed, the missile body attitude is calculated through output signals of the accelerometer array, and the data accuracy and reliability are improved. The device has the advantages that the structure is compact, the anti-overload capacity is high, high-precision test data can be provided in a complex environment, and reliable support is provided for design optimization of a modern weapon system.

Description

Technical Field

[0001] The invention belongs to the field of projectile attitude testing technology, and in particular relates to a projectile attitude testing device based on an accelerometer array. Background Art

[0002] Projectile attitude testing is one of the key technologies to improve the performance of modern weapons and equipment. Projectile attitude testing can significantly improve ballistic accuracy and target hit rate, optimize flight control systems, enhance system adaptability to complex environments, reduce system dependence and costs, and improve overall safety. Therefore, accurate measurement of projectile attitude is of great significance for modern weapon systems and equipment design optimization in the aerospace field.

[0003] Traditional attitude measurement methods mostly rely on gyroscopes and other inertial sensors. However, these methods have significant limitations in high overload environments. Gyroscopes are prone to failure under severe impact, resulting in inaccurate measurement data and unable to meet the needs of high-precision testing. In addition, existing test devices are often complex in structure, making it difficult to achieve effective anti-interference and data protection in practical applications. The lack of attitude data of projectiles in high overload environments has seriously restricted the rapid development of modern weapon systems. Therefore, there is an urgent need to conduct in-depth research on the attitude test technology of projectiles in high overload environments.

[0004] CN103411613A discloses a "missile-borne penetration attitude solver based on geomagnetic / micro-inertial navigation information combination". The missile-borne penetration attitude solver in the article is mainly composed of a geomagnetic / micro-inertial navigation measurement combination unit, a storage and solving unit, and a buffer protection device. The missile body attitude is obtained by solving the collected three-axis gyroscope and three-axis geomagnetic sensor information. At present, the high-overload resistant three-axis gyroscope technology is immature, and there may be failure problems during the test, affecting the reliability and stability of the test. The buffer protection device uses a multi-layer foam metal buffer, which has poor reusability, and there is no special protection at the wiring hole position, so the cable is prone to breakage when impacted. Summary of the invention

[0005] The present invention provides a projectile attitude testing device based on an accelerometer array, the purpose of which is to solve the challenges brought by the transient high overload of the projectile during launching and flying, especially the applicability problems faced by the currently commonly used attitude measurement technology in this situation.

[0006] The technical solution for realizing the present invention is: a projectile attitude test device based on an accelerometer array, comprising a storage circuit, an accelerometer array and an installation protection device; the installation protection device comprises an outer shell, a front cover, a rear cover, a data line cover, an inner cylinder, an inner cylinder end cover and a plurality of pillars; the outer shell is a rotating body, which is composed of three sections of cylinders with increasing outer diameters from front to back, namely the first cylinder, the second cylinder and the third cylinder, and the second cylinder is used to fix the tail of the projectile; a spacer ring is provided between the first cylinder and the second cylinder, and two three-axis acceleration sensors with the same diameter are installed in the first cylinder, the front cover is fixed to the front end face of the first cylinder, the front of the inner cylinder is connected to the rear end face of the spacer ring through a plurality of pillars, and the inner A storage circuit is installed in the cylinder, the inner cylinder end cover is fixedly connected with the rear end face of the inner cylinder, the rear end cover is fixedly connected with the third cylinder, the remaining two three-axis acceleration sensors with the same diameter are fixed on the front end face of the rear end cover, a gap is left between the three-axis acceleration sensor and the inner cylinder end cover, and three-step holes with decreasing diameters are opened from back to front along the central axis of the rear end cover, which are the first-step hole, the second-step hole and the third-step hole respectively, the second-step hole is used to store the data cable, the data cable cover is fixedly connected with the first-step hole, and the third-step hole is used for wiring; the outer shell, the inner cylinder and the inner cylinder end cover are all provided with wiring holes, the four three-axis acceleration sensor cables are connected to the storage circuit through the wiring holes, and the data reading line is led from the storage circuit to the rear second-step hole through the wiring holes.

[0007] Compared with the prior art, the present invention has the following significant advantages:

[0008] (1) The present invention uses an accelerometer array to accurately test the missile body's attitude, effectively overcoming the limitation of traditional gyroscopes that are prone to failure under high overload conditions, and improving the reliability and accuracy of the test equipment.

[0009] (2) The test device has a simple design and compact structure. The double-layer potting technology significantly enhances the protection of the internal storage circuit, effectively resisting the damage of shock waves, while ensuring the stability and reliability of the internal circuit connection.

[0010] (3) The cables are routed along the central axis of the test device, shortening the cable length. The internal encapsulation is integrated and the data line is designed externally, so data can be written and read multiple times, enhancing the protection and reusability of the device and adapting to changing test environments and requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of the testing device of the present invention.

[0012] Figure 2 Schematic diagram of the accelerometer array of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0015] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0016] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0018] The following will further introduce the specific implementation method, as well as the technical difficulties and inventive points of this invention in combination with this design example.

[0019] The present invention provides a projectile attitude testing device based on an accelerometer array, the purpose of which is to solve the challenges brought by the transient high overload of the projectile during launching and flying, especially the applicability problems faced by the currently commonly used attitude measurement technology in this situation.

[0020] Combination Figure 1 , a projectile attitude testing device based on an accelerometer array includes a storage circuit 10, an accelerometer array 6 and an installation protection device.

[0021] The installation protection device comprises an outer shell 2, a front cover 3, a rear cover 4, a data line cover plate 5, an inner cylinder 8, an inner cylinder end cover 9 and a plurality of pillars 7. The outer shell 2 is a rotating body, which is composed of three sections of cylinders with increasing outer diameters from front to back, namely the first cylinder, the second cylinder and the third cylinder, and the outer wall of the second cylinder is processed with threads to be fixedly connected with the tail of the body 1. A spacer ring is provided between the first cylinder and the second cylinder, and two three-axis acceleration sensors with the same diameter are installed in the first cylinder. The front end cover 3 is fixed to the front end face of the first cylinder by means of threads, and the front of the inner cylinder 8 is connected to the rear end face of the spacer ring by means of a number of pillars 7. A storage circuit 10 is installed in the inner cylinder 8, and the inner cylinder end cover 9 is fixedly connected to the rear end face of the inner cylinder 8 by means of eight bolts. The remaining two three-axis acceleration sensors with the same diameter are fixed to the front end face of the rear end cover 4, and a gap is left between the three-axis acceleration sensor and the inner cylinder end cover 9. Three-step holes with decreasing diameters are provided from back to front along the central axis of the rear end cover 4, which are the first step hole, the second step hole and the third step hole, respectively. The second step hole is used to store the data cable, and the data cable cover plate 5 is fixedly connected to the first step hole by means of four bolts, and the third step hole is used for wiring. The outer shell 2, the inner tube 8, and the inner tube end cover 9 are all provided with wiring holes. The four triaxial acceleration sensor cables are connected to the storage circuit 10 through the wiring holes. The data reading line is led from the storage circuit 10 to the rear second-order hole through the wiring holes. This design shortens the cable routing distance and facilitates data reading and input.

[0022] The accelerometer array 6 includes four triaxial acceleration sensors cross-distributed at the center of mass of the assembly, such as Figure 2 As shown, A1, A2, ..., A12 represent the position and direction of each axis of the four three-axis acceleration sensors in the accelerometer array 6. The three axis directions of each three-axis acceleration sensor are perpendicular to each other. A perfect circle is drawn with the distance between the measurement centers of the two three-axis acceleration sensors on the rear end cover 4 as the diameter. The diameter of the perfect circle is l. The directions of the two axes of each of the two three-axis acceleration sensors on the rear end cover 4 coincide with the two adjacent sides of the inscribed square of the perfect circle. The third axis direction of each three-axis acceleration sensor is perpendicular to the directions of the other two axes. The inscribed square is projected from back to front along the central axis direction of the housing 2 to the front end face of the spacer ring to form a projected square. The test center positions of the two three-axis acceleration sensors in the first cylinder coincide with the diagonal vertices of the projected square. The radial directions of the two three-axis acceleration sensors in the first cylinder and the radial directions of the two three-axis acceleration sensors on the rear end cover 4 are in a non-planar perpendicular relationship. The directions of the two axes of each of the two three-axis acceleration sensors in the first cylinder coincide with the two adjacent sides of the projected square, and the direction of the third axis of each three-axis acceleration sensor is perpendicular to the directions of the other two axes. The distance from the front end face of the spacer ring to the front end face of the rear end cover 4 is L, and L≥l.

[0023] This specific sensor arrangement has the significant advantage of compact structure and effectively reduces the impact of sensor output errors on the calculated attitude, thereby improving the accuracy and reliability of test data.

[0024] The protective device is installed and fixedly connected with the tail of the projectile 1 to form an assembly. By adjusting the counterweight, the center of mass of the assembly coincides with the midpoint of the line connecting the center of the inscribed square and the center of the projected square.

[0025] In order to enhance the overload resistance of the internal circuit, the present invention uses potting glue to perform double-layer potting treatment on the inside of the inner tube 8 and the area between the inner tube 8 and the outer shell 2, which can effectively resist the influence of various external impacts and overload phenomena, and ensure the stability and reliability of the circuit test system under extreme conditions. Through such a design, the present invention can not only resist the influence of transient high overload in a variety of complex environments, but also greatly improve the accuracy of the projectile during the posture test process.

Claims

1. A projectile attitude test device based on an accelerometer array, characterized in that: It includes a storage circuit (10), an accelerometer array (6), and a mounting protection device; The installation protection device comprises an outer shell (2), a front end cover (3), a rear end cover (4), a data line cover plate (5), an inner cylinder (8), an inner cylinder end cover (9) and a plurality of pillars (7); the outer shell (2) is a rotating body, and is composed of three sections of cylinders with increasing outer diameters from front to back, namely the first cylinder, the second cylinder and the third cylinder, and the second cylinder is used to fix the tail of the elastic body (1); a spacer ring is provided between the first cylinder and the second cylinder, and two triaxial acceleration sensors with the same diameter are installed in the first cylinder, the front end cover (3) is fixed to the front end surface of the first cylinder, the front of the inner cylinder (8) is connected to the rear end surface of the spacer ring through a plurality of pillars (7), a storage circuit (10) is installed in the inner cylinder (8), and the inner cylinder end cover (9) and the rear end of the inner cylinder (8) are connected to each other. The end faces are fixedly connected by matching, the rear end cover (4) is fixedly connected to the third cylinder, and the remaining two triaxial acceleration sensors arranged with the same diameter are fixed on the front face of the rear end cover (4). A gap is left between the triaxial acceleration sensor and the inner cylinder end cover (9). Three-step holes with decreasing diameters are opened from back to front along the central axis of the rear end cover (4), which are the first step hole, the second step hole and the third step hole in sequence. The second step hole is used to store the data line. The data line cover plate (5) is fixedly connected to the first step hole, and the third step hole is used for wiring. The outer shell (2), the inner cylinder (8) and the inner cylinder end cover (9) are all provided with wiring holes. The four triaxial acceleration sensor cables are connected to the storage circuit (10) through the wiring holes, and the data reading line is led from the storage circuit (10) to the rear second step hole through the wiring holes.

2. The projectile attitude testing device based on the accelerometer array according to claim 1, characterized in that: The accelerometer array (6) comprises four triaxial acceleration sensors which are cross-distributed at the mass center of the assembly, and the three axis directions of each triaxial acceleration sensor are perpendicular to each other.

3. The projectile attitude testing device based on the accelerometer array according to claim 2, characterized in that: A perfect circle is drawn with the distance between the measurement centers of the two three-axis acceleration sensors on the rear end cover (4) as the diameter, the directions of the two axes of each of the two three-axis acceleration sensors on the rear end cover (4) coincide with the two adjacent sides of the square inscribed in the perfect circle, and the direction of the third axis of each three-axis acceleration sensor is perpendicular to the directions of the other two axes; the inscribed square is projected from back to front along the central axis direction of the housing (2) to the front end surface of the partition ring to form a projected square; the test center positions of the two three-axis acceleration sensors in the first cylinder coincide with the diagonal vertices of the projected square, the radial directions of the two three-axis acceleration sensors in the first cylinder and the radial directions of the two three-axis acceleration sensors on the rear end cover (4) are in a non-planar perpendicular relationship, the directions of the two axes of each of the two three-axis acceleration sensors in the first cylinder coincide with the two adjacent sides of the projected square, and the direction of the third axis of each three-axis acceleration sensor is perpendicular to the directions of the other two axes.

4. The projectile attitude testing device based on the accelerometer array according to claim 3, characterized in that: The installation protection device is fixedly connected with the tail of the projectile (1) to form an assembly. By adjusting the counterweight, the center of mass of the assembly coincides with the midpoint of the line connecting the center of the inscribed square and the center of the projected square.

5. The projectile attitude testing device based on accelerometer array according to claim 4, characterized in that: In order to enhance the overload resistance of the internal circuit, a double-layer potting treatment is performed on the interior of the inner cylinder (8) and the area between the inner cylinder (8) and the outer shell (2) using potting glue, which can effectively resist the influence of various external impacts and overload phenomena, and ensure the stability and reliability of the circuit test system under extreme conditions.

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