A two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption

Abstract

The present invention provides a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. The vibration reduction system includes a mechanical system comprising a mechanical structure composed of a spring, a mass, a cantilever beam, and an electromagnet; a control system for generating a signal to a controller, causing the electromagnet to generate an electromagnetic force; and an excitation system for generating a force acting on the mass of the mechanical system. The present invention uses an electromagnet as an actuator to generate a control force, resulting in a fast frequency response, a wide range of values, and high control accuracy. Through a variable-section cantilever beam structure, the displacement at the electromagnet's point of action is amplified to the second mass using the principle of forceful leverage, thereby enhancing its vibration absorption function on the first mass, effectively solving the two-degree-of-freedom vibration reduction problem.

Description

Technical Field

[0001] This invention relates to the fields of structural engineering and vibration control technology, and more specifically, to a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. Background Technology

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

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

[0004] To improve the vibration problem of two-degree-of-freedom systems under complex load excitation, scholars have conducted a lot of research on this problem over the years. Most scholars have started from parameters such as system stiffness and damping, and reduced vibration by optimizing the connection stiffness and damping between structures. However, the vibration reduction effect is limited and cannot change with the external excitation, so it still cannot meet the vibration reduction requirements. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this 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 external excitation, and meet the vibration reduction requirements.

[0006] The technical solution adopted in this invention is:

[0007] The purpose of this invention is to provide a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. The vibration reduction system includes a mechanical system, which comprises a mechanical structure consisting of a spring, a mass block, a cantilever beam, and an electromagnet; it also includes a control system, which generates a signal to a controller to cause the electromagnet to generate electromagnetic force; and an excitation system, which generates a force acting on the mass block of the mechanical system.

[0008] Furthermore, the mechanical system comprises a primary spring, a first mass block, a secondary spring, a second mass block, a cantilever beam, an electromagnet, a base, and a profile fixing end; wherein,

[0009] The cantilever beam is fixed to the profile frame, and the electromagnet is fixed to the profile frame by the corner plate. The electromagnet is located at the variable cross-section 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 spring, the second spring is connected to the first mass block, the first mass block is connected to the first spring, and the other end of the first spring is fixed to the base.

[0010] Furthermore, the excitation system includes a second PC, a second signal processor, a power amplifier, and a vibrator. The second PC generates a signal to the second signal processor, which amplifies the signal, causing the vibrator to generate a force that acts on the first mass block.

[0011] 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, it generates a signal to the controller, causing the electromagnet to generate electromagnetic force.

[0012] 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.

[0013] Furthermore, the cantilever beam in the mechanical system is a variable cross-section beam, with a narrow front section and a wide rear section.

[0014] Furthermore, 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 of the cantilever beam cross-section; the second mass block is connected to the first mass block through a secondary spring; the first mass block is connected to the base through a primary spring.

[0015] Furthermore, the exciter in the excitation system is located directly below the first mass block in the mechanical system.

[0016] Furthermore, the displacement of the cantilever beam at the electromagnet is amplified to the second mass block through the variable cross-section cantilever beam using the lever principle of effort-consuming levers.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] This invention relates to a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption. The system uses an electromagnet as an actuator, resulting in a fast frequency response, a large numerical range, and high control precision. When faced with excitation at complex frequencies, the sensor can detect the displacement of the first mass block to be vibration-damped in real time. Through a feedback algorithm, it outputs a suitable electromagnetic force, which acts on the cantilever beam and is transmitted to the second mass block, thereby enhancing the vibration absorption capacity of the second mass block for the first mass block. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption.

[0021] Figure 2 This is a side view schematic diagram of the mechanical part of a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption;

[0022] Figure 3 This is a schematic diagram of a variable cross-section cantilever beam.

[0023] The markings in the attached figure are as follows:

[0024] 1-First PC; 2-First signal processor;

[0025] 3-Controller; 4-Sensor;

[0026] 5-Second PC; 6-Second signal processor;

[0027] 7-Power amplifier; 801-Electromagnet;

[0028] 802 - Cantilever beam; 803 - Second mass block;

[0029] 804 - Secondary spring; 805 - First mass block;

[0030] 806 - First-stage spring; 807 - Vibrator. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0032] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms first, second, and third may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0034] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0035] See also Figure 1 As shown in the figure, this embodiment of a two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption 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 secondary spring 804, a first mass block 805, and a primary 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 a vibrator 807. The mechanical structure is as follows: one end of the cantilever beam is fixed to the profile through a clamp, 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 of the cantilever beam's cross-section; the second mass block and the first mass block are connected by a secondary spring; the first mass block is connected to the base by a primary spring. The vibrator is located directly below the first mass block in the mechanical system.

[0036] See also Figure 2 As shown, in the mechanical system, the cantilever beam 802 is fixed to the profile frame by a clamping plate, and the electromagnet 801 is fixed to the profile frame by an angle plate. The electromagnet 801 is located at the variable cross-section of the cantilever beam 802. The free end of the cantilever beam 802 is connected to the second mass block 803 by bolts. The second mass block 803 is bonded to the secondary spring 804 by spot welding adhesive. The secondary spring 804 is bonded to the first mass block 805 by spot welding adhesive. The first mass block 805 is bonded to the primary spring 806 by spot welding adhesive. The primary spring 806 is bonded to the base by spot welding adhesive.

[0037] See also Figure 3 The cantilever beam 802 structure, as shown in the figure, is a variable cross-section cantilever beam with two sections having 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 low stiffness; the wide end is a free end connected to the second mass block and has high stiffness.

[0038] See also Figure 1As shown, the exciter 807 in the excitation system is located directly below the first mass block 805 and is bonded together with spot welding adhesive; the second PC 5 in the excitation system generates a signal and transmits it to the power amplifier 7 through the second signal processor 6, causing the exciter 807 to work, driving the first mass block 805 to vibrate and generate displacement. The vibration of the first mass block 805 is the target of vibration reduction.

[0039] The sensors in this embodiment include any one or more combinations of: acceleration sensors, velocity sensors, pressure sensors, displacement sensors, strain sensors, and stress sensors. See also Figure 1 As shown, in the control system, sensor 4 is used to detect the displacement signal of the first mass block 805; the controller 3 in the control system is connected to electromagnet 801; the sensor 4 transmits the detected displacement signal to the second PC 1 through the first signal processor 2, and after the second PC 1 recognizes it, it generates a signal to the controller 3, so that the electromagnet 801 generates electromagnetic force, and the electromagnetic force acts on the cantilever beam 802, causing the cantilever beam 802 to vibrate.

[0040] See also Figure 1 As shown, in the mechanical system, the displacement of the cantilever beam 802 at the narrow end caused by the electromagnet 801 is 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 through the variable cross-section cantilever beam, using the lever principle, resulting in a larger displacement of the second mass block and increasing its vibration absorption function on the first mass block, effectively solving the two-degree-of-freedom vibration reduction problem.

[0041] 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 cause the first mass block 805 to produce complex frequency vibration changes. The sensor 4 can detect the displacement of the first mass block 805 in real time, and through the control system, the electromagnet 801 generates a working force of appropriate phase and appropriate magnitude, which acts on the cantilever beam 802, thereby enhancing the vibration absorption capacity of the second mass block 803 and reducing the amplitude of the first mass block 805.

[0042] This invention uses an electromagnet as an actuator to generate control force, which has a fast frequency response, a large numerical range, and high control accuracy. By using a variable cross-section cantilever beam structure, the displacement at the point of action of the electromagnet is amplified to the second mass block using the lever principle, thereby increasing its vibration absorption function on the first mass block and effectively solving the two-degree-of-freedom vibration reduction problem.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption, characterized in that, The vibration damping system includes a mechanical system, which comprises a primary spring, a first mass block, a secondary spring, a second mass block, a cantilever beam, an electromagnet, a base, and a profile frame; wherein... One end of the cantilever beam is fixed to the profile frame, and the electromagnet is fixed to the profile frame by an angle plate. The electromagnet is located at the variable cross-section of the cantilever beam. The free end of the cantilever beam is connected to a second mass block, the second mass block is connected to one end of a secondary spring, the other end of the secondary spring is connected to a first mass block, the first mass block is connected to one end of a primary spring, and the other end of the primary spring is fixed to the base. The system also includes a control system, which includes a first PC, a first signal processor, a controller, and sensors. The control system detects the displacement signal of the first mass block through the sensors, transmits it to the first PC through the first signal processor, and after the first PC recognizes it, it generates a signal to the controller, causing the electromagnet to generate electromagnetic force. The system also includes an excitation system, which generates a force acting on the first 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 excitation system includes a second PC, a second signal processor, a power amplifier, and a vibrator. The second PC generates a signal to the second signal processor, which amplifies the signal and causes the vibrator to generate a force that acts on the first mass block.

3. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption according to claim 2, characterized in that, The sensors include any one or more combinations of acceleration sensors, velocity sensors, pressure sensors, displacement sensors, strain sensors, and stress sensors.

4. The two-degree-of-freedom vibration reduction system based on electromagnetic vibration absorption according to claim 1, characterized in that, The cantilever beam in the mechanical system is a variable cross-section beam, with a narrow front section and a wide rear section.

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

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