Two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption

Abstract

The invention provides a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. The vibration reduction system comprises a mechanical system, and the mechanical system comprises a mechanical structure composed of a spring, a mass block, a cantilever beam and an electromagnet; the control system is used for generating a signal to the controller, so that the electromagnet generates electromagnetic force; and the excitation system is used for generating force to act on the mass block of the mechanical system. The electromagnet is adopted as an actuator to generate control force, the frequency response is fast, the numerical range is large, and the control precision is high; through the variable cross-section cantilever beam structure, the displacement of the position where the electromagnet acts is amplified to the second mass block according to the labor-consuming lever principle, the vibration absorption function of the second mass block on the first mass block is improved, and the two-degree-of-freedom vibration reduction problem can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of structural engineering and vibration control, and in particular to a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. Background Art

[0002] In engineering structures, vibration can cause a variety of adverse effects. It may cause the accuracy of equipment to decrease, affect the normal operation of equipment, and even cause fatigue damage to the equipment structure.

[0003] A two-degree-of-freedom system is a typical structure. For example, vehicle suspension systems, train systems, civil structure systems, and seismic isolation systems can all be simplified into two-degree-of-freedom systems through certain methods.

[0004] In order to improve the vibration problem of two-degree-of-freedom systems under complex load excitation, scholars have conducted a lot of research on this issue over the years. Most scholars start from parameters such as system stiffness and damping, and reduce vibration by optimizing the connection stiffness and damping between structures. However, the vibration reduction effect is limited and cannot change with changes in external excitation, and still cannot meet the vibration reduction needs. Summary of the invention

[0005] In view of the defects existing in the prior art, the present invention aims to provide a two-degree-of-freedom vibration reduction system based on an electromagnetic vibration absorber, which can improve the vibration reduction effect, change with the change of external excitation, and meet the vibration reduction requirements.

[0006] The technical solution adopted by the present invention is: The object of the present invention is to provide a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption, wherein the vibration reduction system includes a mechanical system, wherein the mechanical system includes a mechanical structure composed of a spring, a mass block, a cantilever beam and an electromagnet; further includes a control system, wherein the control system is used to generate a signal to a controller so that the electromagnet generates an electromagnetic force; and further includes an excitation system, wherein the excitation system is used to generate a force acting on the mass block of the mechanical system.

[0007] Furthermore, the mechanical system comprises a first spring, a first mass block, a second spring, a second mass block, a cantilever beam, an electromagnet, a base and a profile fixed end; wherein, The cantilever beam is fixed on the profile frame, and the electromagnet is fixed on the profile frame by an angle plate. The electromagnet is located at the cross-section variable position of the cantilever beam; the free end of the cantilever beam is connected to the second mass block, the second mass block is connected to the second series spring, the second series spring is connected to the first mass block, the first mass block is connected to the first series spring, and the other end of the first series spring is fixed to the base.

[0008] Furthermore, the excitation system includes a second PC, a second signal processor, a power amplifier and an exciter. The second PC generates a signal to the second signal processor, which is amplified by the power amplifier so that the exciter generates a force acting on the first mass block.

[0009] Furthermore, the control system includes a first PC, a first signal processor, a controller and a sensor; the control system detects the displacement signal of the first mass block through the sensor, transmits it to the second PC through the first signal processor, and after the second PC recognizes it, generates a signal to the controller, so that the electromagnet generates electromagnetic force.

[0010] Furthermore, the sensor includes: any one or more combinations of an acceleration sensor, a velocity sensor, a pressure sensor, a displacement sensor, a strain sensor, and a stress sensor.

[0011] Furthermore, the cantilever beam in the mechanical system is a variable-section beam with a narrow front section and a wide rear end.

[0012] Furthermore, the mechanical structure is as follows: one end of the cantilever beam is fixed to the profile by a clamp, and the other end is connected to the second mass block; the electromagnet is fixed to the profile by an angle plate, and is arranged at the transition point where the cross-section of the cantilever beam changes; the second mass block is connected to the first mass block by a secondary spring; the first mass block is connected to the base by a primary spring.

[0013] Furthermore, the exciter in the excitation system is located directly below the first mass block in the mechanical system.

[0014] Furthermore, the displacement of the cantilever beam at the electromagnet is amplified to the second mass block by the variable-section cantilever beam and the principle of effort lever.

[0015] Compared with the prior art, the advantages of the present invention are: The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption of the present invention uses electromagnets as actuators, and has a fast output force frequency response, a large numerical range, and high control accuracy. In the face of complex frequency excitation, the sensor can detect the displacement of the first mass block required for vibration reduction in real time, and output a suitable electromagnetic force through a feedback algorithm, which acts on the cantilever beam and is transmitted to the second mass block, thereby enhancing the vibration absorption ability of the second mass block for the first mass block. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the structure of a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption; Figure 2 It is a side view schematic diagram of the mechanical part of the two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption; Figure 3 It is a structural schematic diagram of a cantilever beam with a variable cross-section; The symbols in the accompanying drawings are: 1-first PC; 2-first signal processor; 3-controller; 4-sensor; 5-second PC; 6-second signal processor; 7-power amplifier; 801-electromagnet; 802-cantilever beam; 803-second mass block; 804-secondary spring; 805-first mass block; 806-primary spring; 807-vibrator. DETAILED DESCRIPTION

[0018] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0019] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, and third may be used in the present disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0021] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings: See also Figure 1As shown, a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption in this embodiment includes a mechanical system, an excitation system and a control system; the mechanical system includes an electromagnet 801, a cantilever beam 802, a second mass block 803, a second series spring 804, a first mass block 805, and a first series spring 806; the control system includes a first PC 1, a first signal processor 2, a controller 3, and a sensor 4; the excitation system includes a second PC 5, a second signal processor 6, a power amplifier 7, and an exciter 807. The mechanical structure is as follows: one end of the cantilever beam is fixed to the profile through a clamping plate, and the other end is connected to the second mass block; the electromagnet is fixed to the profile through an angle plate and arranged at the transition point where the cross section of the cantilever beam changes; the second mass block is connected to the first mass block through a second series spring; the first mass block is connected to the base through a first series spring. The exciter is located directly below the first mass block in the mechanical system.

[0022] See also Figure 2 As shown, in the mechanical system, the cantilever beam 802 is fixed to the profile frame by a clamp, and the electromagnet 801 is fixed to the profile frame by an angle plate, wherein the electromagnet 801 is located at the cross-section variable position of the cantilever beam 802; the free end of the cantilever beam 802 is connected to the second mass block 803 by a bolt, the second mass block 803 and the secondary spring 804 are bonded together by spot welding glue, the secondary spring 804 and the first mass block 805 are bonded together by spot welding glue, the first mass block 805 and the primary spring 806 are bonded together by spot welding glue, and the primary spring 806 and the base are bonded together by spot welding glue.

[0023] See also Figure 3 The cantilever beam 802 structure is shown in the figure, which is a variable-section cantilever beam. The two sections have the same thickness, a width ratio of 2:1, and a length ratio of 3.3:2. The narrow end is fixed to the profile frame and has a relatively small rigidity; the wide end is a free end connected to the second mass block and has a relatively large rigidity.

[0024] See also Figure 1 As shown, the exciter 807 in the excitation system is located directly below the first mass block 805 and is bonded together by spot welding glue; the second PC 5 in the excitation system generates a signal which is transmitted to the power amplifier 7 through the second signal processor 6, so that the exciter 807 works, driving the first mass block 805 to vibrate and generate displacement. For the first mass block 805, the vibration is the required vibration reduction target.

[0025] The sensor in this embodiment includes: any one or more combinations of acceleration sensors, velocity sensors, pressure sensors, displacement sensors, strain sensors, and stress sensors. Figure 1As shown, the sensor 4 in the control system is used to detect the displacement signal of the first mass block 805; the controller 3 in the control system is connected to the electromagnet 801; the sensor 4 transmits the detected displacement signal to the second PC 1 through the first signal processor 2, and the second PC 1 generates a signal to the controller 3 after identification, so that the electromagnet 801 generates an electromagnetic force, and the electromagnetic force acts on the cantilever beam 802, so that the cantilever beam 802 vibrates.

[0026] See also Figure 1 As shown, the displacement of the cantilever beam 802 at the narrow end caused by the electromagnet 801 in the mechanical system will be amplified at the wide end, enhancing the vibration absorption capacity of the second mass block 803 and further reducing the amplitude of the first mass block 805. The displacement of the cantilever beam at the electromagnet is amplified to the second mass block by the variable-section cantilever beam and the principle of effort lever, so that the second mass block produces a larger displacement, increasing its vibration absorption function for the first mass block, and can effectively solve the two-degree-of-freedom vibration reduction problem.

[0027] See also Figure 1 As shown, in the two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption, the exciter 807 can generate different excitation forces to make the first mass block 805 produce vibration changes of complex frequencies, the sensor 4 can detect the displacement of the first mass block 805 in real time, and through the control system, the electromagnet 801 can generate a driving force with a suitable phase and a suitable size to act on the cantilever beam 802, and the vibration absorption capacity of the second mass block 803 is enhanced, so that the amplitude of the first mass block 805 is reduced.

[0028] The present invention adopts an electromagnet as an actuator to generate control force, which has a fast frequency response, a large numerical range and high control accuracy. Through a variable-section cantilever beam structure, the displacement of the electromagnet acting point is amplified to the second mass block by the principle of effort lever, thereby increasing its vibration absorption function on the first mass block, and can effectively solve the two-degree-of-freedom vibration reduction problem.

[0029] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0030] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption, characterized in that: The vibration reduction system includes a mechanical system, which includes a mechanical structure composed of a spring, a mass block, a cantilever beam and an electromagnet; it also includes a control system, which is used to generate a signal to a controller so that the electromagnet generates an electromagnetic force; it also includes an excitation system, which is used to generate a force acting on the mass block of the mechanical system.

2. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption according to claim 1, characterized in that: The mechanical system comprises a first spring, a first mass block, a second spring, a second mass block, a cantilever beam, an electromagnet, a base and a profile fixed end; wherein, The cantilever beam is fixed on the profile frame, and the electromagnet is fixed on the profile frame by an angle plate. The electromagnet is located at the cross-section variable position of the cantilever beam; the free end of the cantilever beam is connected to the second mass block, the second mass block is connected to the second series spring, the second series spring is connected to the first mass block, the first mass block is connected to the first series spring, and the other end of the first series spring is fixed to the base.

3. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption according to claim 1, characterized in that: The excitation system includes a second PC, a second signal processor, a power amplifier and an exciter. The second PC generates a signal to the second signal processor, which is amplified by the power amplifier so that the exciter generates a force acting on the first mass block.

4. The two-degree-of-freedom vibration reduction system based on the electromagnetic vibration absorber according to claim 3 is characterized in that: The control system includes a first PC, a first signal processor, a controller and a sensor; the control system detects the displacement signal of the first mass block through the sensor, transmits it to the first PC through the first signal processor, and after the first PC recognizes it, generates a signal to the controller, so that the electromagnet generates electromagnetic force.

5. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorber according to claim 3, characterized in that: The sensor includes: any one or more combinations of an acceleration sensor, a velocity sensor, a pressure sensor, a displacement sensor, a strain sensor, and a stress sensor.

6. The two-degree-of-freedom vibration reduction system based on the electromagnetic vibration absorber according to claim 2, characterized in that: The cantilever beam in the mechanical system is a variable-section beam with a narrow front section and a wide rear section.

7. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorber according to claim 1, characterized in that: The mechanical structure is as follows: one end of the cantilever beam is fixed to the profile through a clamping plate, and the other end is connected to the second mass block; the electromagnet is fixed to the profile through an angle plate and arranged at the transition point where the cross-section of the cantilever beam changes; the second mass block is connected to the first mass block through a secondary spring; and the first mass block is connected to the base through a primary spring.

8. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorber according to claim 1, characterized in that: The vibrator in the excitation system is located directly below the first mass block in the mechanical system.

9. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorber according to claim 6, characterized in that: The displacement of the cantilever beam at the electromagnet is amplified to the second mass block by the variable-section cantilever beam and the principle of effort lever.

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