A distributed rotating traveling wave excitation test device for cylindrical shell structures

Abstract

The present invention discloses a distributed rotating traveling wave excitation test device for a cylindrical shell structure. The device includes a base plate and a drive motor located thereon, a coupling, a cylindrical shell, a shell support, a non-contact electromagnetic exciter, a bearing seat, and a slip ring. The cylindrical shell is mounted on the base plate via shell supports at its ends. The non-contact electromagnetic exciter is disposed within the cylindrical shell, with an air gap between the non-contact electromagnetic exciter and the cylindrical shell. The rotating shaft of the non-contact electromagnetic exciter is supported by a bearing seat mounted on the base plate. The drive motor is connected to the rotating shaft via a coupling. The electromagnetic coil is wound around the teeth of the rotor core and secured by a baffle. The outlet end of the electromagnetic coil is connected to a slip ring fixed to the rotating shaft. By adjusting the speed of the drive motor, the number of energized electromagnetic coils, and the current magnitude and frequency in the electromagnetic coils, the cylindrical shell can be subjected to distributed rotating traveling wave excitation with adjustable frequencies, amplitudes, and orders.

Description

Technical Field

[0001] The invention relates to an excitation test device, relates to the field of mechanical vibration, and in particular to a distributed rotating traveling wave excitation test device of a cylindrical shell structure. Background Art

[0002] Cylindrical shell structures have the advantages of light weight, high rigidity, and large capacity, and are widely used in important fields such as mechanical and electrical, aerospace, marine and ocean engineering, and civil engineering. In actual application scenarios, cylindrical shell structures are often subjected to complex excitations, generating vibration and noise, which in turn affects the performance and reliability of the structure. The principle of mechanical vibration shows that the vibration characteristics of a mechanical structure are not only related to the inherent characteristics of the mechanical structure itself, but also to the type of excitation it is subjected to. Therefore, the study of the dynamic characteristics of cylindrical shell structures under different excitations is an important basis for achieving vibration and noise reduction of cylindrical shell structures under these excitations, and is of great significance for improving the working performance and reliability of cylindrical shell structures.

[0003] Existing research has conducted in-depth theoretical analysis of the dynamic characteristics of cylindrical shells under a variety of typical excitations, including transient impact excitation, step excitation, simple harmonic excitation, swept frequency excitation, nonlinear rubbing excitation, and distributed rotating traveling wave excitation. However, most current research focuses on theoretical derivation and simulation verification, and relevant experimental verification cases are relatively scarce. Among these typical excitations, transient impact excitation, step excitation, simple harmonic excitation, swept frequency excitation, and nonlinear rubbing excitation primarily manifest as concentrated forces. Therefore, setting up relevant experimental setups is relatively simple in principle, and some research has made progress in experimental verification. Unlike these concentrated force excitations, distributed rotating traveling wave excitation is distributed in space, and the amplitude of this excitation has the dual properties of varying with time and space. These characteristics make the construction of experimental setups for cylindrical shell structures under rotating traveling wave excitation more complex, which has led to the current lack of relevant technical solutions. Summary of the Invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a distributed rotating traveling wave excitation test device for a cylindrical shell structure.

[0005] The technical solution adopted in the present invention is:

[0006] 1. A distributed rotating traveling wave excitation test device for cylindrical shell structure:

[0007] The test device includes a base plate and a driving motor, a coupling, a cylindrical shell, two shell supports, a non-contact electromagnetic exciter, two bearing seats and a slip ring located thereon. The cylindrical shell is installed on the base plate through two shell supports at the end; the non-contact electromagnetic exciter is installed inside the cylindrical shell, and there is an air gap between the non-contact electromagnetic exciter and the cylindrical shell; the non-contact electromagnetic exciter includes a rotating shaft, a rotor core, a plurality of electromagnetic coils and a plurality of baffles. The rotating shaft is supported by two bearing seats fixed on the base plate, the driving motor is connected to the rotating shaft through a coupling, each electromagnetic coil is wound on the teeth of the rotor core, and each baffle is located outside the electromagnetic coil to fix the electromagnetic coil; the slip ring is fixed on the rotating shaft, and the output end of each electromagnetic coil is connected to the slip ring; the distributed rotating traveling wave excitation test of the cylindrical shell is carried out by adjusting the speed of the driving motor, the number of energized electromagnetic coils, and the frequency and amplitude of the current in each electromagnetic coil.

[0008] The base plate is arranged horizontally, the first shell support and the second shell support are installed vertically and parallelly on the top surface of one side of the base plate, the cylindrical shell is installed horizontally between the first shell support and the second shell support, the first bearing seat and the second bearing seat are installed vertically and parallelly on the symmetrical sides of the first shell support and the second shell support, the rotating shaft is horizontally arranged at the center of the non-contact electromagnetic exciter, and the two ends of the rotating shaft are respectively passed through the through holes opened in the center of the first shell support and the second shell support and then installed horizontally between the first bearing seat and the second bearing seat. The driving motor is horizontally installed on the top surface of the other side of the base plate through the mounting seat, and the output shaft of the driving motor is horizontally and synchronously connected to one end of the rotating shaft through a coupling. The slip ring is installed at the other end of the rotating shaft, and the slip ring is connected to the output ends of each electromagnetic coil.

[0009] The rotating shaft of the non-contact electromagnetic exciter is concentrically mounted in the rotor core. The rotor core has a tooth slot structure distributed along the circumferential direction. When the tooth slot structure is uneven, it can also achieve similar functions as when the tooth slot structure is uniform. Each electromagnetic coil is respectively wound on each tooth of the rotor core and is located in the tooth slot structure. Each baffle is located between the ends of each two adjacent teeth of the rotor core and is located in the tooth slot structure, so that each electromagnetic coil is located in the tooth slot structure between each tooth of the rotor core and each baffle.

[0010] There is an air gap between the rotor core and each baffle of the non-contact electromagnetic exciter and the cylindrical shell. The existence of the air gap allows the rotor core to rotate freely inside the cylindrical shell on the one hand, and enables the non-contact electromagnetic exciter to apply non-contact electromagnetic excitation force to the cylindrical shell on the other hand; the teeth of the rotor core are provided with pole shoes or without pole shoes; the two side surfaces of the teeth of the rotor core are parallel or non-parallel to each other, and the electromagnetic coil is arranged on the teeth. When the two side surfaces of the teeth are parallel, the skeleton can be conveniently installed on the teeth, that is, the electromagnetic coil is first wound on the skeleton, and then the skeleton is installed on the teeth, which helps to reduce the time for coil forming and arrangement; when the two side surfaces of the teeth are not parallel, the electromagnetic coil needs to be directly wound on the teeth. The solution is relatively simple and does not require additional processing of the skeleton; the material of the rotor core has magnetic conductivity.

[0011] The tooth slot structure of the rotor core is uniformly or non-uniformly distributed along the circumference of the rotor core, that is, the tooth slot structure of the rotor core can be uniformly distributed along the circumference or distributed according to a specific pattern. Even when the tooth slot structure is non-uniform, similar functions can be achieved when the tooth slot structure is uniform. The electromagnetic coils arranged on different teeth of the rotor core are energized independently, or are energized after being connected in series or in parallel according to a certain pattern. The number of turns of the electromagnetic coils on different teeth of the rotor core can be the same or different. The electromagnetic coils can be directly wound on the teeth of the rotor core or first wound on the coil skeleton and then installed on the teeth of the rotor core.

[0012] The axial length of the rotating shaft of the non-contact electromagnetic exciter is greater than the axial length of the rotor core, and the axial length of the rotor core is not less than the axial length of the cylindrical shell, so that the cylindrical shell is evenly stressed along the axial direction.

[0013] The material of the cylindrical shell is an isotropic material, an orthotropic material, an anisotropic material, or a composite material with magnetic conductivity; the number of layers of the cylindrical shell is a single layer or a stacked multilayer, and the single layer or multilayer is the structural form of the cylindrical shell, which has a wide range of practical applications in engineering practice. The cylindrical shell in the device disclosed in the present invention can be single-layer or multi-layer. The core is that the device disclosed in the present invention can apply distributed rotating traveling wave excitation to the single-layer or multi-layer cylindrical shell. Whether the cylindrical shell is single-layer or multi-layer will affect its own response characteristics under the action of excitation; the inner and outer surfaces of the cylindrical shell are smooth and flat.

[0014] The slip ring is installed on the rotating shaft through a through-hole type or at the end of the rotating shaft through a flange type; the output end of each electromagnetic coil is connected to the slip ring through the surface of the rotating shaft or through the inside of the rotating shaft.

[0015] The center of the top surface of the base plate is provided with a raised key along its length, and the center of the bottom surfaces of the bearing seat and the shell support are provided with a groove that matches the key. The bearing seat and the shell support are plugged into the key through the groove, and the bearing seat and the shell support are perpendicular to the key. The key is used to position the bearing seat and the shell support on the base plate. The bearing seat and the shell support do not contact each other and can adjust their positions independently. The bearing seat and the shell support can move up and down and left and right along the key, but cannot move forward and backward. When adjusting the height, the drive motor needs to be adjusted at the same time to ensure the alignment of the drive motor and the non-contact electromagnetic exciter.

[0016] 2. A test method for a distributed rotating traveling wave excitation test device for a cylindrical shell structure, comprising:

[0017] The distributed rotating traveling wave excitation test device for a cylindrical shell structure changes the frequency of the distributed rotating traveling wave excitation borne by the cylindrical shell by adjusting the speed of the driving motor and the frequency of the current in each electromagnetic coil, and the speed of the driving motor is zero or greater than zero; the amplitude of the distributed rotating traveling wave excitation borne by the cylindrical shell is changed by adjusting the amplitude of the current in each electromagnetic coil; the order of the distributed rotating traveling wave excitation borne by the cylindrical shell is changed by adjusting the number of energized electromagnetic coils; during the test, direct current of different amplitudes, alternating current with constant amplitude and frequency, alternating current with varying amplitude and constant frequency, alternating current with constant amplitude and varying frequency, and alternating current with DC bias, etc., are passed through each electromagnetic coil to conduct a distributed rotating traveling wave excitation test of the cylindrical shell.

[0018] The beneficial effects of the present invention are:

[0019] 1) The frequency, amplitude and order of the distributed rotating traveling wave excitation borne by the cylindrical shell in the present invention are controllable.

[0020] 2) In the present invention, an electromagnetic coil is arranged on each tooth of the rotor core, and the electromagnetic coils arranged on different teeth of the rotor core can be energized independently, or can be energized after being connected in series or in parallel according to a certain rule, and the technical route is simple.

[0021] 3) The electromagnetic coil in the present invention can pass direct current of different amplitudes, alternating current with constant amplitude and frequency, alternating current with varying amplitude and constant frequency, alternating current with constant amplitude and varying frequency, alternating current with DC bias, etc., and the speed of the driving motor can be zero, and the technical solutions are rich.

[0022] In summary, the present invention can solve the problem of experimental verification of the dynamic characteristics of cylindrical shell structures under rotating traveling wave excitation, can generate distributed rotating traveling wave excitation on the cylindrical shell structure, and can provide experimental conditions for the study of the dynamic characteristics of the cylindrical shell structure under distributed rotating traveling wave excitation and vibration reduction and noise reduction; the present invention can make the cylindrical shell withstand distributed rotating traveling wave excitation with adjustable frequencies, amplitudes and orders by adjusting the speed of the driving motor, the number of energized electromagnetic coils, and the current size and frequency in the electromagnetic coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of distributed rotating traveling wave excitation of different orders, where Figure 1 (a) is a schematic diagram of the second-order distributed rotating traveling wave excitation. Figure 1 (b) is a schematic diagram of the third-order distributed rotating traveling wave excitation. Figure 1 (c) is a schematic diagram of the 4th-order distributed rotating traveling wave excitation. Figure 1 (d) is a schematic diagram of the 6th-order distributed rotating traveling wave excitation;

[0024] Figure 2 It is a schematic structural diagram of an excitation test device implemented in the present invention;

[0025] Figure 3 is a schematic cross-sectional view of an embodiment of the present invention at the position of a non-contact electromagnetic exciter;

[0026] In the figure: 1. base plate, 2. drive motor, 3. coupling, 4. first bearing seat, 5. second bearing seat, 6. first shell support, 7. second shell support, 8. cylindrical shell, 9. non-contact electromagnetic exciter, 10. rotating shaft, 11. slip ring, 12. key, 13. rotor core, 14. baffle, 15. first electromagnetic coil, 16. second electromagnetic coil, 17. third electromagnetic coil, 18. fourth electromagnetic coil, 19. fifth electromagnetic coil, 20. sixth electromagnetic coil, 21. seventh electromagnetic coil, 22. eighth electromagnetic coil, 23. ninth electromagnetic coil, 24. tenth electromagnetic coil, 25. eleventh electromagnetic coil, 26. twelfth electromagnetic coil. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 (a) Figure 1 (b) Figure 1 (c) and Figure 1 As shown in (d), it is the 2nd, 3rd, 4th and 6th order distributed rotating traveling wave excitation. Figure 2As shown, the cylindrical shell structure distributed rotating traveling wave excitation test device of the present invention includes a base plate 1 and a driving motor 2 located thereon, a coupling 3, a cylindrical shell 8, two shell supports 6, 7, a non-contact electromagnetic exciter 9, two bearing seats 4, 5 and a slip ring 11. The cylindrical shell 8 is installed on the base plate 1 through the two shell supports 6, 7 at the end; the non-contact electromagnetic exciter 9 is installed inside the cylindrical shell 8, and there is an air gap between the non-contact electromagnetic exciter 9 and the cylindrical shell 8; the non-contact electromagnetic exciter includes a rotating shaft 10, a rotor core 13, a plurality of electromagnetic wires The cylindrical shell 8 is equipped with a plurality of sliding rings and a plurality of baffles 14. The rotating shaft 10 is supported by two bearing seats 4 and 5 fixed on the base plate 1. The driving motor 2 is connected to the rotating shaft 10 through a coupling 3. Each electromagnetic coil is wound on the teeth of the rotor core 13. Each baffle is located outside the electromagnetic coil to fix the electromagnetic coil; the slip ring 11 is fixed on the rotating shaft 10, and the output end of each electromagnetic coil is connected to the slip ring 11; the distributed rotating traveling wave excitation test of the cylindrical shell 8 is carried out by adjusting the speed of the driving motor 2, the number of energized electromagnetic coils, and the frequency and amplitude of the current in each electromagnetic coil.

[0029] The base plate 1 is arranged horizontally, the first shell support 6 and the second shell support 7 are installed vertically and parallelly at intervals on the top surface of one side of the base plate 1, the cylindrical shell 8 is installed horizontally between the first shell support 6 and the second shell support 7, the first bearing seat 4 and the second bearing seat 5 are installed vertically and parallelly at intervals on the symmetrical sides of the first shell support 6 and the second shell support 7, the rotating shaft 10 is horizontally arranged at the center of the non-contact electromagnetic exciter 9, and the two ends of the rotating shaft 10 are respectively passed through the through holes opened in the center of the first shell support 6 and the second shell support 7 and then horizontally installed between the first bearing seat 4 and the second bearing seat 5. The drive motor 2 is horizontally installed on the top surface of the other side of the base plate 1 through the mounting seat, and the output shaft of the drive motor 2 is horizontally and synchronously connected to one end of the rotating shaft 10 through the coupling 24. The slip ring 11 is installed at the other end of the rotating shaft 10, and the slip ring 11 is connected to the output ends of each electromagnetic coil.

[0030] The axial length of the rotating shaft 10 of the non-contact electromagnetic exciter 9 is greater than the axial length of the rotor core 13, and the axial length of the rotor core 13 is not less than the axial length of the cylindrical shell 8, so that the cylindrical shell 8 is uniformly stressed along the axial direction. The material of the cylindrical shell 8 is an isotropic material, an orthotropic material, anisotropic material or a composite material with magnetic conductivity; the number of layers of the cylindrical shell 8 is a single layer or a stacked multilayer, and the single layer or multilayer is the structural form of the cylindrical shell, which has a wide range of practical applications in engineering practice. The cylindrical shell in the device disclosed in the present invention can be single-layer or multi-layer, and the core is that the device disclosed in the present invention can apply distributed rotating traveling wave excitation to the single-layer or multi-layer cylindrical shell. Whether the cylindrical shell is single-layer or multi-layer will affect its own response characteristics under excitation; the inner and outer surfaces of the cylindrical shell 8 are smooth and flat. The slip ring 11 is installed on the rotating shaft 10 through a through-hole type, or is installed at the end of the rotating shaft 10 through a flange type; the output end of each electromagnetic coil is connected to the slip ring 11 through the surface of the rotating shaft 10 or through the inside of the rotating shaft 10.

[0031] A raised key 7 is provided at the center of the top surface of the base plate 1 along its length, and a groove that matches the key 12 is provided at the center of the bottom surfaces of the bearing seats 4, 5 and the shell supports 6, 7. The bearing seats 4, 5 and the shell supports 6, 7 are plugged into the key 12 through the grooves, and the bearing seats 4, 5 and the shell supports 6, 7 are perpendicular to the key 12. The key 12 is used to position the bearing seats 4, 5 and the shell supports 6, 7 on the base plate 1. The bearing seats 4, 5 and the shell supports 6, 7 do not contact each other and can adjust their respective positions independently. The bearing seats 4, 5 and the shell supports 6, 7 can move up and down and left and right along the key 12, but cannot move forward and backward. When adjusting the height, the drive motor 2 needs to be adjusted at the same time to ensure the centering state of the drive motor 2 and the non-contact electromagnetic exciter 9.

[0032] The rotating shaft 10 of the non-contact electromagnetic exciter 9 is concentrically mounted in the rotor core 13. The rotor core 13 has a tooth slot structure distributed along the circumferential direction. When the tooth slot structure is uneven, it can also achieve similar functions as when the tooth slot structure is uniform. Each electromagnetic coil is wound around each tooth of the rotor core 13 and is located in the tooth slot structure. Each baffle 14 is located between the ends of each two adjacent teeth of the rotor core 13 and is located in the tooth slot structure, so that each electromagnetic coil is located in the tooth slot structure between each tooth of the rotor core 13 and each baffle 14.

[0033] There is an air gap between the rotor core 13 and each baffle 14 of the non-contact electromagnetic exciter 9 and the cylindrical shell 8. The existence of the air gap allows the rotor core 13 to rotate freely inside the cylindrical shell 8 on the one hand, and enables the non-contact electromagnetic exciter 9 to apply non-contact electromagnetic excitation force to the cylindrical shell 8 on the other hand; the teeth of the rotor core 13 are provided with pole shoes or without pole shoes; the two side surfaces of the teeth of the rotor core 13 are parallel or non-parallel to each other, and the electromagnetic coil is arranged on the teeth. When the two side surfaces of the teeth are parallel, the skeleton can be conveniently installed on the teeth, that is, the electromagnetic coil is first wound on the skeleton, and then the skeleton is installed on the teeth, which helps to reduce the time for coil forming and arrangement; when the two side surfaces of the teeth are not parallel, the electromagnetic coil needs to be directly wound on the teeth. The solution is relatively simple and does not require additional processing of the skeleton; the material of the rotor core 13 is magnetically conductive.

[0034] The tooth slot structure of the rotor core 13 is evenly or unevenly distributed along the circumference of the rotor core 13, that is, the tooth slot structure of the rotor core 13 can be evenly distributed along the circumference or distributed according to a specific pattern. When the tooth slot structure is uneven, it can also achieve similar functions as when the tooth slot structure is uniform; the electromagnetic coils arranged on different teeth of the rotor core 13 are energized independently, or are energized after being connected in series or in parallel according to a certain pattern; the number of turns of the electromagnetic coils on different teeth of the rotor core 13 can be the same or different; the electromagnetic coils can be directly wound on the teeth of the rotor core 13 or first wound on a coil skeleton and then installed on the teeth of the rotor core 13.

[0035] The test method of the cylindrical shell structure distributed rotating traveling wave excitation test device of the present invention is as follows:

[0036] The distributed rotating traveling wave excitation test device for cylindrical shell structure changes the frequency of the distributed rotating traveling wave excitation borne by the cylindrical shell 8 by adjusting the speed of the driving motor 2 and the frequency of the current in each electromagnetic coil, and the speed of the driving motor 2 is zero or greater than zero; by adjusting the amplitude of the current in each electromagnetic coil, the amplitude of the distributed rotating traveling wave excitation borne by the cylindrical shell 8 is changed; by adjusting the number of energized electromagnetic coils, the order of the distributed rotating traveling wave excitation borne by the cylindrical shell 8 is changed; during the test, direct current of different amplitudes, alternating current with constant amplitude and frequency, alternating current with varying amplitude and constant frequency, alternating current with constant amplitude and varying frequency, and alternating current with DC bias, etc., are passed through each electromagnetic coil to conduct a distributed rotating traveling wave excitation test of the cylindrical shell 8.

[0037] like Figure 3As shown, in a specific implementation of the present invention, the rotor core 13 has a tooth slot structure uniformly distributed along the circumferential direction. The rotor core 13 has 12 teeth. The electromagnetic coils 15-26 are evenly arranged on different teeth of the rotor core 13. Only one coil is arranged on each tooth where the electromagnetic coils 15-26 are located. The electromagnetic coils 15-26 can be energized independently or in series or in parallel according to a certain rule. The number of turns of the electromagnetic coils 15-26 is the same. The teeth on the rotor core 13 do not have pole shoes, and the two side faces of the teeth are parallel to each other. The rotor core 13 is made of laminated silicon steel sheets. The cylindrical shell 8 is made of Q235 steel and has a single layer. The slip ring 11 is flange-mounted at the end of the rotating shaft 10. The rotating shaft 10 is a hollow shaft. The outlet ends of the electromagnetic coils 15-26 are led out from the inside of the rotating shaft 10 and then connected to the slip ring 11.

[0038] The cylindrical shell 8 is excited by using an excitation test device, which can make the cylindrical shell 8 withstand distributed rotating traveling wave excitation with variable frequency, amplitude and order, as follows:

[0039] Example 1:

[0040] The speed of the drive motor 2 is set to 3000 rpm. A constant-amplitude DC power is supplied to the electromagnetic coils 15, 19, and 23 through the slip ring 11. The other electromagnetic coils 16, 17, 18, 20, 21, 22, 24, 25, and 26 are not powered. Then, the cylindrical shell 8 will be subjected to a distributed rotating traveling wave excitation of order 3, as shown in FIG. Figure 1 As shown in (b), the main frequency components of the excitation include 150 Hz, 300 Hz, 450 Hz, etc. If other conditions remain unchanged and the speed of the drive motor 2 is changed to 6000 rpm, the cylindrical shell 8 will still be subjected to the distributed rotating traveling wave excitation of order 3, and the main frequency components of the excitation will become 300 Hz, 600 Hz, 900 Hz, etc.

[0041] Example 2:

[0042] Set the speed of the drive motor 2 to 0 rpm, and supply alternating current with a constant amplitude and a frequency of 50 Hz to the electromagnetic coils 15, 19, and 23 through the slip ring 11. The other electromagnetic coils 16, 17, 18, 20, 21, 22, 24, 25, and 26 are not powered. The cylindrical shell 8 will be subjected to a distributed rotating traveling wave excitation of order 3, as shown in FIG. Figure 1 As shown in (b), the main frequency component of the excitation is 100 Hz.

[0043] Example 3:

[0044] The speed of the drive motor 2 is set to 6000 rpm. A constant-amplitude DC power is supplied to the electromagnetic coils 15, 18, 21, and 24 through the slip ring 11. The other electromagnetic coils 16, 17, 19, 10, 22, 23, 24, 25, and 26 are not powered. Then, the cylindrical shell 8 will be subjected to a distributed rotating traveling wave excitation of order 4, as shown in FIG. Figure 1 As shown in (c), the main frequency components of the excitation include 400 Hz, 800 Hz, 1200 Hz, etc.

[0045] Example 4:

[0046] The speed of the drive motor 2 is set to 6000 rpm. A constant-amplitude DC power is supplied to the electromagnetic coils 15, 17, 19, 21, 23, and 25 through the slip ring 11. The other electromagnetic coils 16, 18, 10, 22, 24, and 26 are not powered. Then, the cylindrical shell 8 will be subjected to a distributed rotating traveling wave excitation of order 6, as shown in FIG. Figure 1 As shown in (d), the main frequency components of the excitation include 600 Hz, 1200 Hz, 1800 Hz, etc.

[0047] Example 5:

[0048] By increasing the amplitude of the current supplied to the electromagnetic coil in Examples 1-4, the amplitude of the distributed rotating traveling wave excitation borne by the cylindrical shell 8 will also increase.

[0049] Therefore, the present invention's distributed rotating traveling wave excitation test device for cylindrical shell structures can subject cylindrical shell 8 to distributed rotating traveling wave excitation with adjustable frequency, amplitude, and order by adjusting the speed of drive motor 2, the amplitude and frequency of the current flowing through electromagnetic coils 15-26, and the number of energized electromagnetic coils. This device offers the advantages of high practicality and ease of operation, providing experimental conditions for analyzing the structural dynamic characteristics of cylindrical shell 8 under rotating traveling wave excitation and for reducing vibration and noise.

Claims

1. A distributed rotating traveling wave excitation test device for cylindrical shell structures, characterized by: The invention comprises a base plate (1) and a driving motor (2) located thereon, a coupling (3), a cylindrical shell (8), two shell supports (6, 7), a non-contact electromagnetic exciter (9), two bearing seats (4, 5) and a slip ring (11), wherein the cylindrical shell (8) is mounted on the base plate (1) through two shell supports (6, 7) at the end thereof; the non-contact electromagnetic exciter (9) is mounted inside the cylindrical shell (8), and an air gap exists between the non-contact electromagnetic exciter (9) and the cylindrical shell (8); the non-contact electromagnetic exciter comprises a rotating shaft (10), a rotor core (13), a plurality of electromagnetic coils and a plurality of baffles (14 ), the rotating shaft (10) is supported by two bearing seats (4, 5) fixed on the base plate (1), the driving motor (2) is connected to the rotating shaft (10) through a coupling (3), each electromagnetic coil is wound on the teeth of the rotor core (13), and each baffle is located outside the electromagnetic coil to fix the electromagnetic coil; the slip ring (11) is fixed on the rotating shaft (10), and the output end of each electromagnetic coil is connected to the slip ring (11); by adjusting the speed of the driving motor (2), the number of energized electromagnetic coils, and the frequency and amplitude of the current in each electromagnetic coil, a distributed rotating traveling wave excitation test of the cylindrical shell (8) is carried out; The rotating shaft (10) of the non-contact electromagnetic exciter (9) is concentrically mounted in the rotor core (13). The rotor core (13) has a tooth slot structure distributed along the circumferential direction. Each electromagnetic coil is wound around each tooth of the rotor core (13) and is located in the tooth slot structure. Each baffle (14) is located between the ends of each two adjacent teeth of the rotor core (13) and is located in the tooth slot structure, so that each electromagnetic coil is located in the tooth slot structure between each tooth of the rotor core (13) and each baffle (14).

2. The cylindrical shell structure distributed rotating traveling wave excitation test device according to claim 1, characterized in that: The base plate (1) is arranged horizontally, the first shell support (6) and the second shell support (7) are installed vertically and parallelly at intervals on the top surface of one side of the base plate (1), the cylindrical shell (8) is installed horizontally between the first shell support (6) and the second shell support (7), the first bearing seat (4) and the second bearing seat (5) are installed vertically and parallelly at intervals on the symmetrical sides of the first shell support (6) and the second shell support (7), the rotating shaft (10) is horizontally arranged at the center of the non-contact electromagnetic exciter (9), and the two ends of the rotating shaft (10) are respectively passed through the through holes opened in the centers of the first shell support (6) and the second shell support (7) and then installed horizontally between the first bearing seat (4) and the second bearing seat (5), the driving motor (2) is horizontally installed on the top surface of the other side of the base plate (1) through the mounting seat, the output shaft of the driving motor (2) is horizontally and synchronously connected to one end of the rotating shaft (10) through the coupling (24), the slip ring (11) is installed at the other end of the rotating shaft (10), and the slip ring (11) is connected to the output end of each electromagnetic coil.

3. The cylindrical shell structure distributed rotating traveling wave excitation test device according to claim 1, characterized in that: An air gap exists between the rotor core (13) and each baffle (14) of the non-contact electromagnetic exciter (9) and the cylindrical shell (8); the teeth of the rotor core (13) are provided with pole shoes or are not provided with pole shoes; the two side surfaces of the teeth of the rotor core (13) are parallel to each other or non-parallel; and the material of the rotor core (13) has magnetic conductivity.

4. The distributed rotating traveling wave excitation test device for cylindrical shell structures according to claim 1, characterized in that: The tooth slot structure of the rotor core (13) is evenly or unevenly distributed along the circumference of the rotor core (13); the electromagnetic coils arranged on different teeth of the rotor core (13) are energized independently, or are respectively connected in series or in parallel and then energized.

5. The distributed rotating traveling wave excitation test device for cylindrical shell structure according to claim 1, characterized in that: The axial length of the rotating shaft (10) of the non-contact electromagnetic exciter (9) is greater than the axial length of the rotor core (13), and the axial length of the rotor core (13) is not less than the axial length of the cylindrical shell (8).

6. The cylindrical shell structure distributed rotating traveling wave excitation test device according to claim 1, characterized in that: The material of the cylindrical shell (8) is an isotropic material, an orthotropic material, an anisotropic material or a composite material with magnetic conductivity; the number of layers of the cylindrical shell (8) is a single layer or multiple layers arranged in a stacked manner.

7. The distributed rotating traveling wave excitation test device for cylindrical shell structures according to claim 1, characterized in that: The slip ring (11) is installed on the rotating shaft (10) through a through-hole type, or is installed on the end of the rotating shaft (10) through a flange type; the output end of each electromagnetic coil is connected to the slip ring (11) through the surface of the rotating shaft (10) or through the inside of the rotating shaft (10).

8. The distributed rotating traveling wave excitation test device for cylindrical shell structures according to claim 1, characterized in that: The center of the top surface of the base plate (1) is provided with a raised key (7) along its length direction, and the centers of the bottom surfaces of the bearing seats (4, 5) and the shell supports (6, 7) are provided with grooves that match the key (12). The bearing seats (4, 5) and the shell supports (6, 7) are inserted into the key (12) through the grooves, and the bearing seats (4, 5) and the shell supports (6, 7) are perpendicular to the key (12).

9. The test method of the cylindrical shell structure distributed rotating traveling wave excitation test device according to any one of claims 1 to 8, characterized in that: include: The cylindrical shell structure distributed rotating traveling wave excitation test device changes the frequency of the distributed rotating traveling wave excitation borne by the cylindrical shell (8) by adjusting the rotation speed of the driving motor (2) and the frequency of the current in each electromagnetic coil, and the rotation speed of the driving motor (2) is zero or greater than zero; the amplitude of the distributed rotating traveling wave excitation borne by the cylindrical shell (8) is changed by adjusting the amplitude of the current in each electromagnetic coil; the order of the distributed rotating traveling wave excitation borne by the cylindrical shell (8) is changed by adjusting the number of energized electromagnetic coils; during the test, direct current of different amplitudes, alternating current with constant amplitude and frequency, alternating current with varying amplitude and constant frequency, alternating current with constant amplitude and varying frequency, and alternating current with DC bias are passed through each electromagnetic coil to conduct a distributed rotating traveling wave excitation test of the cylindrical shell (8).

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