CN106483031B - Torsional vibration testing system and combined device - Google Patents

Abstract

The application provides a torsional vibration testing system and a combined device, comprising a coil, a magnetic conduction loop, a joint, a magnetic body and a rotating shaft; the coil is wound on the magnetic conduction loop; the magnetic conduction loop is provided with an opening to form two ends, and the two ends of the magnetic conduction loop are respectively connected with two connectors in the pair of connectors; the magnetic body is connected with the rotating shaft and is positioned between the two joints. The application directly drives the external rotating component to carry out torsion output through the rotating shaft, does not need a speed reducer, has high mechanical transmission efficiency, has quick response because of no intermediate transmission link, and can avoid fixed frequency noise when the teeth of the speed reducer are meshed; the torsion frequency of the shaft is changed only by changing the frequency of the energizing current of the coil, so that the low-frequency and high-frequency performances of the shaft are better; an external magnetic shielding component is not needed during driving, so that the structure is simplified; the arrangement is more flexible, and the space adaptability is strong; the magnetic circuit component is flexible and changeable in shape.

Description

Torsional vibration testing system and combined device

Technical Field

The application relates to the technical field of torsional vibration testing platforms, material torsional property testing technologies and electromagnetic permanent magnet direct driving, in particular to a torsional vibration testing system device and a combined device thereof.

Background

The torsional vibration testing system is mainly applied to application of torsional vibration excitation, and is used for testing functional parameters of products in a torsional vibration state and endurance performance of materials under the action of the torsional vibration excitation. The existing vibrating table and material performance testing device mainly applies excitation in three translation directions to detect the functional characteristics of products and the tensile-compression characteristics of materials, and only can meet the general application requirements. For some specific fields and applications, the torsional properties of the product and material must be considered. Accordingly, there is a need for such a torsional vibration testing system.

No description or report of similar technology is found at present, and similar data at home and abroad are not collected.

Disclosure of Invention

In view of the drawbacks of the prior art, an object of the present application is to provide a combination device for a torsional vibration testing system.

The torsional vibration testing system comprises a coil, a magnetic conduction loop, a magnetic body and a rotating shaft;

the coil is wound on the magnetic conduction loop or in a section of notch of the magnetic conduction loop;

the magnetic conduction loop is provided with an opening to form two ends, the two ends of the magnetic conduction loop are not connected with the connectors or are respectively connected with two connectors in a pair of connectors;

the magnetic body is connected with the rotating shaft and is positioned at two ends of the magnetic conduction loop or between the two joints.

Preferably, the device further comprises a magnetic balance block; magnetic balance blocks are arranged on two sides of the magnetic body; the magnetic conduction loop is a C-shaped body; the magnetic body adopts any one or a plurality of connection combination bodies of permanent magnets, electromagnets and soft magnets; the magnetic conduction loop adopts soft magnetic material, amorphous material or nanocrystalline material; the magnetic balance block adopts a concave shape, and the magnetic body adopts a convex shape matched with the groove correspondingly; the magnetic balance block can rotate to adjust the included angle with the horizontal plane, can also adjust the distance between the magnetic balance block and the magnetic body, and can lock the included angle and the distance; the end part of the rotating shaft is positioned in the coil or extends out of the coil, and the end part of the rotating shaft is connected with an external supporting part to output reciprocating swing torque and motion, wherein the part outside the coil is a roller bearing or a roller bearing; the magnetic body is inlaid in the rotating shaft or connected to the surface of the rotating shaft; the magnetic balance block is positioned outside or inside the coil; the number of the coils is one or more, and a plurality of coils are connected in series and/or in parallel.

Preferably, a torsion drive output arm is also included; one end of the torsion driving output arm is fixedly connected with the rotating shaft, and the other end of the torsion driving output arm is provided with a torsion driving connecting hole.

Preferably, the device also comprises a connecting piece and an external tested part; the rotating shaft is connected with an external tested part through a connecting piece; the connecting piece is a rigid connecting piece or a flexible connecting piece; the two ends of the external tested part are in a fixed state, a free state or a fixed state and a free state respectively.

According to the application, a combined device comprises one or more torsional vibration testing systems, wherein the torsional vibration testing systems form a rotary vibration exciter, and are connected and apply rotary excitation to an excited component; the excited component is an external tested component and/or platform.

Preferably, one position of the excited component is connected with the rotary exciter, or a plurality of positions are respectively connected with different rotary exciters; wherein the rotary actuator rotates following the actuated component or the housing of the rotary actuator is fixed.

Preferably, the device further comprises an external driving device; an external drive is coupled to the actuated component.

Preferably, a plurality of positions of the platform are respectively connected with rotary exciters which are arranged in different axial directions, and the shell of the rotary exciters is fixed; the rotary exciter is connected with the platform through a hinge structure; the multiple positions of the platform are connected with balanced unloading structures along three directions of XYZ; the hinge structure is a combination of a rigid hinge structure, a combination of an elastic rod and a kinematic pair or a combination of a flexible structure and a kinematic pair, wherein the combination of the rigid hinge structure comprises a thick-wall part and a thin-wall part which are connected, the number of the thin-wall parts is one or more, and the axial directions among the thin-wall parts are different.

According to the application, a combination device is provided, comprising a plurality of torsional vibration testing systems, wherein:

-corresponding connections between the two ends of the magnetically conductive loops of the plurality of torsional vibration testing systems, forming two junction points extending to the two joints of the pair of joints, respectively; or alternatively

-staggered between the beginning of the magnetic conductive loops of the plurality of torsional vibration testing systems.

Preferably, the intersection point is in an L shape, a T shape, a cross shape, a Y shape, an X shape or more than three crossed lines.

Compared with the prior art, the application has the following beneficial effects:

(1) Direct drive, high transmission efficiency. Compared with the traditional rotary output mode, the driving device directly drives the external rotary part to carry out torsion output through the rotary shaft 5, a speed reducer is not needed, the mechanical transmission efficiency is high, and the loss is low.

(2) The response is fast, and the irrelevant noise is small. Because of no intermediate transmission link, the response is quick, and the noise of fixed frequency when the gear of the speed reducer is meshed with the gear can be avoided.

(3) The frequency range is wide. Compared with the traditional motor, the driving mode changes the torsion frequency of the shaft by only changing the frequency of the energizing current of the coil, and the low-frequency and high-frequency performances of the motor are better.

(4) And the C-shaped magnetic loop has small magnetic leakage. The magnetic conduction loop of the driving mode is C-shaped. The coil is wound on the annular magnetic conductive material, and the energizing can generate a relatively uniform magnetic field at the gap of the C-shaped structure. The magnetic body is positioned at the gap magnetic field and rotates under the action of the magnetic field. The gap magnetic field has less magnetic leakage, so that an external magnetic shielding component is not needed in driving under normal conditions, and the structure is simplified.

(5) The arrangement is more flexible, and the space adaptability is strong. The number of coils of the driver is not limited to one, and the arrangement of the coils on the magnetic circuit is not limited to one side as shown in fig. 1. Meanwhile, the strict conditions of the external space can be met through the combination of a plurality of C-shaped magnetic loops at different space positions, and simultaneously, large torque is generated.

(6) The magnetic circuit component is flexible and changeable in shape. The joint 3 can be specially designed according to the requirements of the magnetic field size and the magnetic field uniformity, and the shape is not limited to a cylindrical shape and a cuboid shape. The shape of the magnetic balance 6 is not limited to a rectangular parallelepiped shape, and the arrangement position thereof is not limited to a horizontal position. The properties of the magnetic balance block can be specially designed according to the required restoring moment. Meanwhile, the initial balance position can be changed according to the requirement on the balance position during driving. The shape of the magnetic body 4 is not limited to the rectangular parallelepiped shape shown in fig. 1, and may be a special shape designed according to the driving requirements.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

fig. 1 is a schematic structural view of a basic embodiment of the present application.

Fig. 2 is a schematic diagram of the magnetic field line direction according to the basic embodiment of the present application.

Fig. 3 is a schematic structural diagram of embodiment 1 of the present application.

Fig. 4, 5 and 6 are schematic structural views of embodiment 2 of the present application.

Fig. 7, 8 and 9 are schematic structural views of embodiment 3 of the present application.

Fig. 10, 11 and 12 are schematic structural views of embodiment 4 of the present application.

Fig. 13 is a schematic structural view of embodiment 5 of the present application.

Fig. 14 is a schematic structural view of embodiment 6 of the present application.

Fig. 15 is a schematic structural view of embodiment 7 of the present application.

Fig. 16 is a schematic structural view of embodiment 8 of the present application.

Fig. 17 is a schematic structural view of embodiment 9 of the present application.

Fig. 18 is a schematic structural diagram of an embodiment 10 of the present application.

Fig. 19 is a schematic structural view of embodiment 11 of the present application.

Fig. 20 is a schematic structural diagram of embodiment 12 of the present application.

Fig. 21, 22, 23, 24 and 25 are schematic structural views of various hinge structures that can be adopted in embodiment 12 of the present application.

Fig. 26 is a schematic structural diagram of embodiment 13 of the present application.

Fig. 27 is a schematic structural view of embodiment 14 of the present application.

Fig. 28 is a schematic structural diagram of embodiment 15 of the present application.

Fig. 29 and 30 are schematic structural diagrams of embodiment 16 of the present application.

Fig. 31, 32, 33 and 34 are schematic structural views of embodiment 17 of the present application.

Fig. 35 and 36 are schematic structural views of embodiment 18 of the present application.

Fig. 37, 38 and 39 are schematic structural views of embodiment 19 of the present application.

Fig. 40 is a schematic structural diagram of an embodiment 20 of the present application.

In the figure:

Detailed Description

The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.

Basic examples:

structural principle:

as shown in fig. 1, a coil 1 is wound around a magnetic conductive loop 2, and the magnetic conductive loop 2 is made of a soft magnetic material having relatively high relative magnetic permeability. The joint 3 is to form a uniform magnetic field in a wide range, and its shape is not limited to a cylindrical shape or a rectangular parallelepiped shape. The magnetic body 4 may be a permanent magnet or an electromagnet as shown in fig. 1. The rotating shaft 5 supports the magnetic body 4, the magnetic body 4 and the rotating shaft 5 rotate synchronously, and the rotating shaft 5 can be connected with an external rotating component. The pair of magnetic balance blocks 6 are distributed on two sides of the magnetic pole of the magnetic body 4, and the included angle between the pair of magnetic balance blocks 6 and the horizontal line and the distance between the pair of magnetic balance blocks and the axis of the magnetic body 4 are adjustable, so that the magnetic body 4 is balanced and stabilized at a certain angle position. The magnetic balance 6 may be composed of a permanent magnet or an electromagnetic coil, and the magnetic pole direction is shown in fig. 1. The magnetic balance 6 may be made of another material having a certain attraction to the magnetic body 4. The magnetic field lines 7 are shown in dashed lines, the distribution of which indicates the direction of the magnetic field. It can be seen that the magnetic body 4 and the rotating shaft 5 are in a uniform magnetic field formed by other components.

Driving mechanism:

when the coil is not energized, the magnetic body 4 is stabilized at a certain position by the magnetic balance 6, which may be called an initial balance position. When the magnetic body 4 is deviated from the equilibrium position, the magnetic balance weight 6 generates a torque to the magnetic body 4 that hinders the deviation from the equilibrium position and makes it have a tendency to return to the equilibrium position. Such torque may be referred to as a restoring torque and it varies with the variation of the rotation angle of the magnetic body 4. When a current is applied to the coil 1 to form a magnetic field direction indicated by a magnetic field line and an arrow in fig. 2, the magnetic body 4 generates a counterclockwise torque by the magnetic field, and when the torque is larger than the restoring torque, the magnetic body 4 deflects counterclockwise. When a reverse current is applied to the coil 1, the magnetic field in which the magnetic body 4 is located is reversed, and when the torque applied to the magnetic body 4 is greater than the restoring torque, the magnetic body 4 is deflected clockwise. If an alternating current with a certain frequency is supplied to the coil 1, the magnetic body 4 is twisted reciprocally by the same driving principle, and the external member connected to the rotating shaft 5 is rotated synchronously. By changing the energizing frequency of the coil 1, the frequency of torsion of the rotating shaft 5 can be changed.

Preferred and/or modified examples of the basic embodiment will be specifically described below.

Specific example 1:

fig. 3 shows a form in which two C-shaped magnetic circuits are butted relatively, wherein three parts of a, B and C can be used for placing electromagnetic coils. The coils of the three parts can be combined at will according to specific situations so as to meet the restrictions of external installation environments and the like. Of course, the electromagnetic coils at the left and right sides A and B can be connected into a whole, so that the space can be fully utilized. Wherein, two C type magnetic circuit openings are relative, share a pair of joints.

Specific example 2:

fig. 4, 5 and 6 show two C-drives connected together in a vertical manner, with the dashed line being the magnetic circuit conducting condition. This arrangement allows for special space-mounting constraints. The coils at D, E, F may be selectively arranged.

Specific example 3:

the coil 1 is not limited to the positions shown in fig. 7, 8 and 9, but may be positioned as shown by the broken lines in fig. 7 and 8, or may be formed by any combination thereof. The magnetic circuit 2 is composed of three C-type drivers. The functions of the other parts can be referred to as the structure and function in fig. 1.

Specific example 4:

the driving modes shown in fig. 10, 11 and 12 are formed by combining four C-shaped drivers, and the magnetic conduction loop 2 is double-cross-shaped. The coil 1 arrangement position is not limited to the positions shown in fig. 10, 11, and 12. The rotating shaft 5 can be led out from the gap of the coil, connected with an external rotor system and used for outputting rotary motion.

Specific example 5:

the torsional drive scheme shown in fig. 13 can be used to test the torsional vibration characteristics of a product in a particular arcuate motion scheme. The torsion driving output arm 8 is used for converting torsion motion on the rotating shaft 5 into torsion motion along an arc direction under a certain radius. The torsion drive connection hole 9 is used for connecting the excited object and the torsion drive system.

Specific example 6:

fig. 14 shows a first C-shaped actuator 31, a multiple degree of freedom magnetic rotor device 32, and a second C-shaped actuator 33. A multiple free torsional vibration drive system is comprised of two (or more) C-drives arranged in a spatially interleaved (or multidirectional) arrangement.

Specific example 7:

the torsional vibration testing system provided by the application can be used as a rotary vibration exciter 11. Fig. 15 is a schematic diagram showing a torsional excitation test of the external part 13 to be tested by the rotary vibration exciter 11 designed by the principle described above. The rotary vibration exciter 11 and the external tested part 13 are connected through a connecting piece 12. The connection between the rotary vibration exciter 11 and the external part 13 to be tested may be rigid or flexible, depending on the specific requirements of the test. The rotary exciter 11 provides an exciting force of reciprocating torsional excitation, or a specific form of torsional excitation force. The two ends of the external tested part 13 are supported by other parts and can rotate around the axis, and the rotating speed of the external tested part is the same as that of the rotary vibration exciter 11. Fig. 15 is a diagram showing the torsional characteristics of the external part under test 13 under the boundary condition that both ends are in a free state.

Specific example 8:

the torsion characteristics of the external part under test 13 under the boundary condition that one end is in a free state and the other end is fixed (i.e., a fixed state) are tested as shown in fig. 16.

Specific example 9:

as shown in fig. 17, two rotary exciters, which are respectively denoted as a first rotary exciter 14 and a second rotary exciter 15, are provided. The first rotary vibration exciter 14 and the second rotary vibration exciter 15 are two coaxially installed rotary vibration exciters. The device can have the following two working states: the first rotary vibration exciter 14 and the second rotary vibration exciter 15 rotate in the same direction and at the same speed, and the first rotary vibration exciter 14 and the second rotary vibration exciter 15 rotate at different speeds. When the two rotary vibration exciters rotate in the same direction and at the same speed, the two rotary vibration exciters act simultaneously, so that the torque is increased, and the adverse effect caused by the torsional deformation of the external tested part 13 during testing is reduced. When rotating at different speeds, the external part 13 to be tested can be tested in the state of rotating at the same speed at both ends and rotating at opposite directions at both ends.

Specific example 10:

as shown in fig. 18, the second rotary vibration exciter 15 rotates together with the external part 13 to be tested. When the torsional excitation test is performed, the torsional excitation force output by the first rotary vibration exciter 14 drives the external tested part 13 and the second rotary vibration exciter 15 to synchronously rotate together. At this time, the second rotary vibration exciter 15 can apply a specific torsional excitation force, and is superimposed on the force output by the first rotary vibration exciter 14, so as to realize decoupling of two torsional excitation forces, thereby realizing a more complex torsional excitation test.

Specific example 11:

as shown in fig. 19, the external driving device 16 can drive the external part 13 to be tested to rotate in a full cycle. The test mode is to test the performance of the external tested part 13 when the torsion exciting force is applied in the whole rotation process. The external driving device 16 can simulate the running conditions of acceleration, deceleration, uniform speed and the like of the external tested part 13 in the actual running process. The first rotary vibration exciter 14 rotates synchronously with the external part 13 to be tested, and simultaneously applies a torsional excitation force when necessary.

Specific example 12:

as shown in fig. 20, a three-degree-of-freedom rotary excitation table (i.e., rotary exciter) is shown, an external tested part can be placed on the platform 22, and three rotary exciters, namely, a rotary exciter 21, a rotary exciter 23 and a rotary exciter 24, respectively provide torsional excitation forces in three directions A, B, C, and are fixed at a certain position in space. The hinge structure 25 is a torque transmission structure, and may be a combination of a rigid hinge structure, a combination of an elastic rod and other kinematic pairs, or a combination of a flexible structure and other kinematic pairs.

When the lever 25 is a combination of rigid hinge structures, it can cause the platform to generate a large rotation angle, enabling a large stroke swing. When the elastic lever 25 is a combination of an elastic lever and other kinematic pairs, since the elastic lever can be deformed with a small deflection, a small swing of the platform can be achieved. When the flexible rod 25 is a combination of a flexible structure and other kinematic pairs, it may also cause the platform to rotate or swing, with the magnitude of the angle of rotation or swing depending on the flexible hinge structure being designed.

The hinge structure 25 transmits the excitation torque of the rotary exciter to the platform 22 while preventing interference of the motion. The four corners of the platform 22 are respectively subjected to balanced unloading in three directions of XYZ, so that the exciting forces of the three rotary exciters can be fully utilized. Different directional unloading can also be selectively performed for different angles. The balance unloading structure can be a spring, one end of the spring is connected with the platform, and the other end of the spring is fixed. The A-direction rotary vibration exciter 21, the B-direction rotary vibration exciter 23 and the C-direction rotary vibration exciter 24 can be coaxially and symmetrically arranged in pairs, or can be arranged on one side only.

Further, fig. 21, 22, 23, 24, 25 depict different versions of the three hinges described above.

In fig. 21, the hinge structure 25 is a combination of an elastic rod and other kinematic pairs, and can implement three-degree-of-freedom micro-swing of the platform 22 by using deflection deformation of the elastic rod. The other parts are identical to those of fig. 20.

In fig. 22, the hinge structure 25 is a form of a rigid hinge structure combination, wherein the first C-shaped driver 31 may be an a-direction rotary exciter 21, a B-direction rotary exciter 23, a C-direction rotary exciter 24, which is fixed to the ground. The attached component 34 may be the platform 22. The multiple degree of freedom magnetic rotor device 32 is a pair of axial movement but not rotation, and the second C-shaped driver 33 is a hook joint having two degrees of rotation freedom. With this structure, the platform in fig. 20 can be rotated in three degrees of freedom. The hinge has two hook hinges and two moving pairs.

In fig. 23, the hinge structure 25 is another form of a combination of rigid hinge structures, and the multiple degree of freedom magnetic rotor device 32 and the second C-shaped actuator 33 are the same as those in fig. 22. However, only one moving pair is included in this figure, and is on the first C-type driver 31 side.

In fig. 24, the hinge structure 25 is another form of a combination of rigid hinge structures, and the multiple degree of freedom magnetic rotor device 32 and the second C-shaped actuator 33 are the same as those in fig. 22. However, only one pair of movement is included in this figure, and is on the side of the connected member 34.

In fig. 25, the structure of the hinge structure 25 is an example of the flexible hinge structure shown in fig. 20, and uses the principle that the thin wall portion is greatly deformed to generate the required rotation or movement. The hinge structure 25 shown in fig. 25 has two rotational axes which can be rotated around the YZ axis by a small angle. Which is similar to a hook hinge. The first and second connection sides 35, 36 are connected to the a-direction rotary vibration exciter 21, the B-direction rotary vibration exciter 23, the C-direction rotary vibration exciter 24, and the platform 22, respectively. When connected, the second C-shaped actuator 33 can be used in combination with the sliding pair in the manner shown in fig. 22, 23 and 24, and the second C-shaped actuator 33 is a flexible hinge structure shown in fig. 25.

Specific example 13:

as shown in fig. 26, the rotary vibration exciters 21 and 23 can swing together with the platform 22, and thus decoupling of the rotary vibration excitation motion can be achieved. The hinge structure 25 is a rigid connection part, and rigidly connects the platform 22 with the output shafts of the A-direction rotary vibration exciter 21 and the B-direction rotary vibration exciter 23, so that the permanent magnet inside the driver is rigidly connected with the platform 22 through the shaft 5, and can synchronously rotate. The parts of the rotary exciters 21 and 23 which rotate are the structures of the outer cylinder wall, the coil and the like, the structures are supported by the components in the driver, and the weight of the structures is loaded on the platform 22 through the rotating shaft 5 and the hinge structure 25. When exciting force is applied, the structures such as the outer cylinder wall, the coil and the like are equivalent to a rotor, the output rotating shafts of the platform 22, the A-direction rotary exciter 21 and the B-direction rotary exciter 23 are fixedly connected together to be equivalent to a static stator, and the rotor rotates relative to the stator under the action of exciting moment. At this time, due to the interaction force principle, the stator is also subjected to the same excitation moment, so that the platform can swing synchronously. The other parts are identical to those of fig. 20.

Embodiment 14:

as shown in fig. 27, the components in the basic embodiment are in different shapes and sizes in the present embodiment, and the joint 3 and the magnetic balance block 6 are both in the form of grooves, so that the gap between the joint and the magnetic body 4 is uniform, and the operation is smoother. The magnetic balance 6 is here in the form of an electromagnet, the direction of the magnetic field formed by which is shown in fig. 21. The magnitude of the balance moment can be changed by changing the current, so that the magnetic body 4 is less likely to deviate from the balance position. Meanwhile, the included angle between the magnetic balance block 6 and the horizontal line can be changed, so that the magnetic body 4 can be balanced at a certain angle position.

Embodiment 15:

as shown in fig. 28, the gaps among the joint 3, the magnetic balance weight 6 and the magnetic body 4 can be adjusted, the magnetic balance weight 6 is of a concave permanent magnet type, and the magnetic pole direction is as shown in fig. 22; the dashed line in fig. 22 shows that the magnetic balance 6 can change the gap with the magnetic pattern 4.

Embodiment 16:

as shown in fig. 29, 30, a soft magnetic body 10, such as an industrial pure iron, is shown. The soft magnetic body 10 and the magnetic body 4 form a cylinder with a circular cross section, so that the gaps between the soft magnetic body and the joint 3 and the magnetic balance weight 6 are more uniform, and the generated moment is smoother and the running is smoother. The magnetic body 4 and the soft magnetic body 10 are rigidly connected. The magnetic body 4 may be embedded in the soft magnetic body 10 (as shown in fig. 30), or may be integrally overlapped with the soft magnetic body 10 (as shown in fig. 29), wherein the shape of the magnetic body 4 is not limited to a rectangle.

Embodiment 17:

as shown in fig. 31, 32, 33, and 34, a plurality of preferable examples of the arrangement of the magnetic balance weight of the basic embodiment show a case where one magnetic body 4 is used in the coil 1 using a solenoid. The rotating shaft 5 is fixedly connected with the magnetic body 4 and synchronously rotates. When the magnetic body 4 is in the position shown by the solid line, the magnetic body is in a horizontal position, and can be balanced at the position under the attraction action of the magnetic balance block 6, and meanwhile, the included angle between the magnetic balance block 6 and the horizontal position and the distance between the magnetic balance block and the axis of the magnetic balance block 5 are adjustable. The coil 1 is supplied with alternating current to enable the magnetic body 4 to generate a moment for reciprocating rotation, the moment drives the magnetic body 4 and the rotating shaft 5 to reciprocate together, the rotating shaft 5 extends out of the coil 1, and the coil is connected with external components to output reciprocating swinging torque and motion. The properties of the magnetic balance 6 are not limited to those shown in fig. 31, 32, 33, and 34, and the arrangement positions thereof are not limited to those shown in fig. 31, 32, 33, and 34. It can be arranged at four side positions or several of the side positions A, B, C, D in fig. 31, 32, 33 and 34, and the distance between the axis of the rotating shaft 5 and the included angle between the axis of the rotating shaft and the horizontal plane can be adjusted, so that the balance position of the magnetic body 4 can be adjusted. The outer support member 16 serves as a support structure for the rotation shaft 5, may be a bearing, and may limit the degree of freedom of the rotation shaft in the axial direction. The outer support member 16 may be disposed inside the coil 1 or may be disposed outside.

Embodiment 18:

as shown in fig. 35 and 36, as a preferred modification of the coil arrangement of the basic embodiment, two coils are symmetrically arranged above and below the magnetic body 4, so that the magnetic body 4 can also generate a driving moment for reciprocating swing. The number of coils 1 is not limited to two as shown in fig. 35 and 36, and a plurality of pairs of coils of different sizes may be symmetrically arranged on both sides of the magnetic body 4. Both coils in fig. 35 and 36 may be connected in series or in parallel. If there are multiple coils, the inductance of the coils can be changed by series-parallel connection of the coils, thereby improving the performance of the high frequency of the driving mode.

Embodiment 19:

as shown in fig. 37, 38, and 39, the magnetic body 4 is a permanent magnet in the magnetic rotor, and may be embedded in the rotating shaft 5, and only one bearing serving as the external support member 16 is externally supported, and the magnetic body 4 may generate a swinging torque under the magnetic field generated by the coil 1, thereby driving the magnetic body 4 and the rotating shaft 5 to rotate synchronously. The rotary shaft 5 is connected with an external part to output swinging exciting force. The outer support member 16 may be a roller bearing or a roller bearing.

Specific example 20:

fig. 40 shows a first C-shaped actuator 31, a multiple degree of freedom magnetic rotor device 32, and a second C-shaped actuator 33. A multiple free torsional vibration drive system is comprised of two (or more) C-drives arranged in a spatially interleaved (or multidirectional) arrangement. The magnetic body 4 (generally, permanent magnet) in the multi-degree-of-freedom magnetic rotor device 32 can be made into a hemispherical shape at both ends, and the joint 3 can be made into a concave hemispherical shape, so that the gap between the joint 3 and the magnetic body 4 is uniform, and the stable output of driving force or torque is facilitated.

The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.

Claims (9)

1. The torsional vibration testing system is characterized by comprising a coil, a magnetic conduction loop, a magnetic body and a rotating shaft;

the coil is wound on the magnetic conduction loop or in a section of notch of the magnetic conduction loop;

the magnetic conduction loop is provided with an opening to form two ends, the two ends of the magnetic conduction loop are not connected with the connectors or are respectively connected with two connectors in a pair of connectors;

the magnetic body is connected with the rotating shaft and is positioned at two ends of the magnetic conduction loop or between the two joints;

the magnetic balance block is also included; magnetic balance blocks are arranged on two sides of the magnetic body; the magnetic conduction loop is a C-shaped body; the magnetic body adopts any one or a plurality of connection combination bodies of permanent magnets, electromagnets and soft magnets; the magnetic conduction loop adopts soft magnetic material, amorphous material or nanocrystalline material;

the magnetic balance block adopts a concave shape, and the magnetic body adopts a convex shape matched with the groove correspondingly; the magnetic balance block can rotate to adjust the included angle with the horizontal plane, can also adjust the distance between the magnetic balance block and the magnetic body, and can lock the included angle and the distance; the end part of the rotating shaft is positioned in the coil or extends out of the coil, and the end part of the rotating shaft is connected with an external supporting part to output reciprocating swing torque and motion, wherein the part outside the coil is a roller bearing or a roller bearing; the magnetic body is inlaid in the rotating shaft or connected to the surface of the rotating shaft; the magnetic balance block is positioned outside or inside the coil; the number of the coils is one or more, and a plurality of coils are connected in series and/or in parallel;

when the coil is not electrified, the magnetic body is stabilized at an initial balance position under the action of the magnetic balance block; when the magnetic body deviates from the balance position, the magnetic balance weight generates a torque for the magnetic body, which prevents the magnetic body from deviating from the balance position and enables the magnetic body to have a tendency to restore the balance position, and the torque changes along with the change of the rotation angle of the magnetic body; when current is introduced into the coil, the magnetic body generates anticlockwise torque under the action of the magnetic field, and when the torque is larger than the restoring torque, the magnetic body generates anticlockwise deflection; when reverse current is introduced into the coil, the magnetic field of the magnetic body is reversed, the torque acting on the magnetic body is reversed, and when the torque is larger than the restoring torque, the magnetic body deflects clockwise; the energizing frequency of the coil is changed, and the torsion frequency of the rotating shaft is changed.

2. The torsional vibration testing system of claim 1, further comprising a torsional drive output arm; one end of the torsion driving output arm is fixedly connected with the rotating shaft, and the other end of the torsion driving output arm is provided with a torsion driving connecting hole.

3. The torsional vibration testing system of claim 1, further comprising a connector, an external part under test; the rotating shaft is connected with an external tested part through a connecting piece; the connecting piece is a rigid connecting piece or a flexible connecting piece; the two ends of the external tested part are in a fixed state, a free state or a fixed state and a free state respectively.

4. A combination comprising one or more torsional vibration testing systems of any one of claims 1 to 3, said torsional vibration testing systems comprising a rotary exciter coupled to and applying rotary excitation to the excited component; the excited component is an external tested component and/or platform.

5. The combination of claim 4, wherein one position of the excited member is connected to a rotary actuator, or a plurality of positions are respectively connected to different rotary actuators; wherein the rotary actuator rotates following the actuated component or the housing of the rotary actuator is fixed.

6. The combination of claim 4, further comprising an external drive device; an external drive is coupled to the actuated component.

7. The combination of claim 4, wherein the plurality of positions of the platform are each coupled to a rotary actuator arranged in a different axial direction, the housing of the rotary actuator being fixed; the rotary exciter is connected with the platform through a hinge structure; the multiple positions of the platform are connected with balanced unloading structures along three directions of XYZ;

the hinge structure is a combination of a rigid hinge structure, a combination of an elastic rod and a kinematic pair or a combination of a flexible structure and a kinematic pair, wherein the combination of the rigid hinge structure comprises a thick-wall part and a thin-wall part which are connected, the number of the thin-wall parts is one or more, and the axial directions among the thin-wall parts are different.

8. A combination comprising a plurality of torsional vibration testing systems of any one of claims 1-3, wherein:

-corresponding connections between the two ends of the magnetically conductive loops of the plurality of torsional vibration testing systems, forming two junction points extending to the two joints of the pair of joints, respectively; or alternatively

-staggered between the ends of the magnetic conductive loops of the plurality of torsional vibration testing systems.

9. The combination of claim 8, wherein the junction is L-shaped, T-shaped, cross-shaped, Y-shaped, X-shaped, or more than three intersecting lines.