WO2004025035A1

WO2004025035A1 - A initiative mass magnetic-driving vibration control device

Info

Publication number: WO2004025035A1
Application number: PCT/CN2003/000745
Authority: WO
Inventors: Jinping Ou; Hui Li; Chunwei Zhang
Original assignee: Jinping Ou; Hui Li; Chunwei Zhang
Priority date: 2002-09-13
Filing date: 2003-09-03
Publication date: 2004-03-25
Also published as: WO2004025035A8; AU2003261609A1

Abstract

The present invention discloses a magnetic-driving initiative mass vibration control system comprising a control device, a track and a block of mass the bottom of which is provided with a DC energizing coil as the secondary pole of a VCM. The slide-rail bed having a long stator coil as the primary pole of the VCM is set beneath the mass.

Description

TECHNICAL FIELD

The invention relates to a damping control system. Specifically, it is a shock absorption control system for civil engineering structures.

Background technique

At present, in order to ensure the safety of civil engineering structures under the action of earthquakes and hurricanes, and to reduce the losses caused by natural disasters, civil engineering structures have introduced methods to protect the structure based on traditional seismic design and fortification, specifically, It is to add a mechanism, support, or energy damping device to the original structure to absorb the energy input to the structure by dynamic effects such as earthquakes and hurricanes, thereby reducing the structure's own dynamic response and protecting the structure. Typical methods such as various passive control methods represented by increasing stiffness and damping, active control technologies that actively apply a certain amount of energy to the structure to reduce its response based on feedback from loads and structural responses, until the hybrid developed in recent years Control and semi-active control methods. Traditional structural seismic design methods and recently developed passive control methods only provide the structure with certain strength, stiffness, and ductility. However, when the load on the structure reaches and exceeds a certain strength, these methods can not meet the design requirements and Is not economical. In contrast, active control has a unique advantage in resisting strong dynamic loads. The reason is that the active control uses the feedback information of the structure response, combined with appropriate control algorithms, to instruct the driving device in the control system to generate control force, and the control mechanism and the structure jointly resist the uncertain loads such as earthquakes and hurricanes, so that The dynamic response of the structure is reduced. Active control makes the structure self-regulating The control objectives should be adjusted appropriately to achieve reasonable and feasible control decisions. Therefore, the scope of application is wider and the control effect is more obvious. Among the many active control devices, an active mass drive (AMD) control system is a more mature and commonly used form.

Figure 9 shows the structure of a conventional hydraulic or motor-driven AMD control system. Generally, the AMD control system is composed of a mass 36, an actuating drive device 34, a control device consisting of a feedback sensor 31, a measurement and online calculation 33, and a control chip 32, and a spring and a damper 37. Among them, there are two types of actuators: hydraulic actuators or servo motors. The widely used electro-hydraulic pushers nowadays have complicated structures and high manufacturing costs. They require hydraulic oil and frequent oil changes. Maintenance is troublesome. There are many seals. They often fail and cause the pushers to fail to work properly. Slip hooks can occur during suction operation. Phenomenon, slow start and release time, can not be used in the working conditions of instantaneous operation, low frequency of operation, not suitable for frequent operations. In addition, the hydraulic system relies on the oil circuit to adjust the inlet and outlet oil to generate the force, and its response time is relatively slow. When the required control is more detailed, the system's sensitivity to time lag will be significantly increased, which will not only reduce the system's The working performance can not achieve the ideal control effect, and it also brings the hidden danger of active control instability. Although the servo motor has made some improvements to the hydraulic pressure, but because it is still a contact force transmission, there are still insurmountable problems. Its slow start may be too late to respond to sudden earthquakes or other emergency events. Under the action, due to the contact between the slide rail and the mass, the dynamic friction between the contact surfaces will consume more energy, and a larger noise will be generated during its operation. In addition, AMD control systems that use pneumatic motion have also been studied. However, whether it is pneumatic or hydraulic technology, they face the defects of slow response time and low control accuracy.

Summary of the Invention

The purpose of the present invention is to provide a sensitive response, simple structure, low noise and high accuracy. Magnetic drive active mass AMD control system. The purpose of the present invention is achieved as follows: It includes a mass block, a control device, and a track. A DC excitation coil serving as a secondary pole of a linear motor is installed at the lower part of the mass block. There are long stator windings that serve as the primary poles for linear motors. The device of the present invention may further include the following structural features: 1. Suspended electromagnet sets are installed on both sides of the mass block and on the side wall of the slide rail bed. 2. The mass of ball is supported on the rail bed. 3. A guide ball is arranged on the side wall of the slide rail bed. 4. The slide rail bed has a rectangular groove shape, and anti-collision wall spring sets are installed on the two end walls of the slide rail bed. 5. The rail bed is arc-shaped, and the bottom of the mass is arc-shaped. In order to overcome the defects of slow response time and low control accuracy of the traditional AMD system, the device of the invention mainly improves its actuation drive system, and retains the rest of the traditional AMD system. It comprehensively adopts magnetic levitation and motor drive technology. The mass suspends, comes out of contact with the track, and uses a motor to drive the mass motion, replacing all contact elements (including actuators, springs and dampers) in traditional AMD systems. Changing the contact force transmission to a non-contact type can overcome many shortcomings of traditional AMD systems and can receive many beneficial effects. Mainly reflected in: The use of motor drive technology to directly convert electrical energy into mechanical energy of mass motion, without any intermediate conversion drive. It can effectively overcome the shortcomings of large volume, low efficiency, high energy consumption, poor accuracy, and environmental pollution when using hydraulic or pneumatic drives; the introduction of magnetic levitation technology, which generates electromagnetic thrust directly through electrical energy, no mechanical contact, no wear and tear on running transmission parts, Low mechanical loss; reliable operation, high transfer efficiency, low manufacturing cost, easy maintenance, little or no noise in the device or system, and good operating environment; linear motors can perform high-precision work under computer control with unlimited speed. The poles and secondary poles can be completely separated and installed in the slide rail and the mass respectively. A complete active AMD control system formed in this way has the characteristics of high efficiency, energy saving and high precision. It is technologically advanced, economically reasonable, and a control that meets environmental protection requirements. The device can better meet the needs of practical application of the project.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of a magnetic suspension type magnetic drive active mass AMD vibration control system; FIG. 2 is a longitudinal sectional structural view of FIG. 1;

3 is a transverse sectional structural view of FIG. 1;

4 is another longitudinal sectional view of FIG. 1, that is, a longitudinal sectional structural diagram in the form of an arc-shaped track;

FIG. 5 is a top view of a non-maglev magnetic drive active mass AMD vibration control system; FIG. 6 is a longitudinal sectional structural view of FIG. 5;

7 is a cross-sectional structural view of FIG. 5;

8 is another longitudinal sectional view of FIG. 5, that is, a longitudinal sectional structural diagram in the form of an arc track;

Figure 9 is a schematic diagram of a conventional AMD configuration.

detailed description

The present invention will be described in more detail below with reference to the drawings.

In the figure, reference numeral 1 indicates a slide bed (primary pole), reference numeral 2 indicates a mass block (secondary pole), reference numeral 3 indicates a long stator winding, reference numeral 4 indicates a DC excitation coil, reference numeral 5 indicates an anti-collision wall spring group, and reference numeral 6 indicates a suspension. Electromagnet set, reference numeral 7 is the side wall of the orbital bed, reference numeral 8 is the end wall of the orbital bed, reference numeral 9 is the trajectory of the sine traveling wave magnetic field movement, reference numeral 10 is the traveling wave magnetic field movement direction, reference numeral 11 is the arc track, and reference numeral 12 is the bottom plate The upper support ball, reference number 13 indicates the guide ball on the side wall, reference number 31 indicates the feedback sensing system, reference number 32 indicates the controller chip, reference number 33 indicates the computer, reference number 34 indicates the oil pump, reference number 35 indicates the power source, and reference number 36 indicates the mass block. Number 37 Indicates springs and dampers.

In the first embodiment, in combination with FIG. 1 to FIG. 3, it shows a structure of an implementation of a magnetic suspension type magnetic drive active mass AMD vibration control system. It includes a mass block 2, a DC excitation coil 4 as a secondary pole of the linear motor is installed at the lower part of the mass block, and a slide rail bed 1 is arranged below the mass block, and a long stator winding 3 as the primary pole of the linear motor is arranged in the slide rail bed. The slide rail bed has a rectangular slot shape. Two end walls 7 of the slide rail bed are provided with anti-collision wall spring groups 5, and two sides of the mass block and the side wall of the slide rail bed are provided with a suspension electromagnet group 6. Adopting the permanent magnetic levitation technology (EMS) or superconducting magnetic levitation technology (EDS), installing electromagnets or permanent magnets on the two sides of the mass block and the tracks opposite to it, relying on the attractive force and repulsive force of their interaction to make the mass Levitation, adjust the height of the suspension by changing the amount of current flowing in the electromagnet. This step can also be omitted if suspended masses are not required. Then, the traditional rotary motor was transformed into a linear motor, and a rotary induction motor was cut along a radial direction and flattened. In a linear motor, the equivalent of a rotary motor stator is called the initial pole, and it is installed in In the slide bed, it is equivalent to the secondary pole of the rotating electrical machine rotor, and it is installed in the shield gauge block. The primary pole of a conventional cylindrical motor is stretched and straightened to form a slide rail. The closed magnetic field of the primary pole is changed to an open magnetic field. After a three-phase symmetrical sinusoidal current is passed through the three-phase winding of the motor, an air-gap magnetic field is generated. The distribution of the gap magnetic field 9 is similar to that of a rotary electric machine, and is distributed sinusoidally along the unfolded straight line direction. When the three-phase current changes with time, the air-gap magnetic field moves in a straight line according to the directional phase sequence, and is a translational traveling wave magnetic field. When direct current is applied to the secondary pole (mass block), it interacts with the air gap magnetic field to generate electromagnetic thrust. At this time, the primary pole (sliding rail bed) is fixed, and the secondary pole moves in the direction of the traveling wave magnetic field. Do linear motion. In traditional motors, the rotation of the motor is mainly controlled by changing the frequency of the alternating current in the primary pole and the way of energization. Here, the frequency and amplitude of the alternating current in the primary pole and the direct current in the secondary pole can be changed to control the mass of the mass. Active control.

The second embodiment, combined with FIG. 4, shows the structure of another implementation of a magnetic suspension type magnetic drive active mass AMD vibration control system. It differs from the previous embodiment in that the slide rail bed 11 has an arc shape, and the bottom of the mass 2 has an arc shape. This curved track can save space and is especially suitable for installation in buildings with limited space. Unlike a straight track, the use of an arc-shaped track should minimize the horizontal projection size of the track to obtain the advantage of a small footprint. For this reason, the mass should reduce the height of its center of gravity as much as possible, the flatter the better, and make it have as much contact length with the track as possible, and the motor stator winding 3 and the DC excitation coil 4 are made into arcs according to the curvature of the track Shape, respectively installed on the top of the curved track 11 and the lower part of the mass 2, the curvature of the track must be given by design. In addition, the arc-shaped track structure can also eliminate the need for structures such as anti-collision springs and side walls. The rest are exactly the same as the straight track.

The third embodiment, combined with Figs. 5-7, shows the structure of a non-maglev magnetic drive active mass AMD vibration control system. It is different from the first embodiment in that: a mass block supporting ball 12 is provided on the slide rail bed. In this way, the suspension magnet group can be omitted, the manufacturing cost is relatively low, and the technical difficulty is relatively small.

The fourth embodiment, combined with FIG. 8, shows the structure of another non-maglev magnetic drive active mass AMD vibration control system. It differs from the third embodiment in that the slide rail bed 11 has an arc shape, and the bottom of the mass 2 has an arc shape.

Claims

Claim

1. A magnetic drive active mass D vibration control system, which includes a mass block, a control device, a track, etc., which is characterized in that a DC excitation coil as a secondary pole of a linear motor is installed at the lower part of the mass block and a lower part of the mass block is provided with Rail bed, a long stator winding is installed in the rail bed as the initial pole of the linear motor.

2. The magnetic drive active mass AMD vibration control system according to claim 1, characterized in that: a suspension electromagnet group is installed on both sides of the mass block and on the side wall of the slide rail bed.

3. The magnetic drive active mass AMD vibration control system according to claim 1, characterized in that: a mass support ball is provided on the slide bed.

4. The magnetic drive active mass AMD vibration control system according to claim 3, characterized in that: a guide ball is provided on a side wall of the slide rail bed.

5. The magnetic drive active mass AMD vibration control system according to claim 1, 2, 3 or 4, characterized in that the slide rail bed has a rectangular groove shape, and anti-collision walls are installed on two end walls of the slide rail bed. Spring set.

6. The magnetic drive active mass AMD vibration control system according to claim 1, 2, 3 or 4, wherein the slide bed has an arc shape and the bottom of the mass block has an arc shape.