Electromagnetic active control device for flange vibration reduction and vibration reduction control method

Abstract

The present application relates to a kind of electromagnetic active control device and vibration control method for flange vibration reduction, 4 electromagnet is arranged around the pipeline connected with flange and is arrayed interval and wrapped pipeline, two electromagnets symmetric with flange center are connected in series as a group, two vibration controllers are independently controlled to two groups of electromagnets respectively, corresponding control current is calculated to electromagnet by the vibration signal of flange and pipeline, to generate corresponding electromagnetic force and carry out vibration suppression.For flange vibration active control, closed-loop feedback control loop is constructed, and active control of flange vibration is realized;Control quantity is calculated from time domain and frequency domain respectively, first, vibration amplitude is reduced from time domain, and then, characteristic frequency is captured from frequency domain for accurate control, effectively improve control performance and precision.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, and in particular to an electromagnetic active control device and vibration control method for flange vibration reduction. Background Technology

[0002] Currently, the conventional vibration reduction method for steam turbine generator sets is still the passive installation of vibration damping components, such as vibration damping frames and spring sheets. Passive components have wear and tear and lifespan issues, and cannot effectively reduce noise. The design does not effectively control flange vibration and lacks corresponding active vibration reduction and noise reduction performance. Summary of the Invention

[0003] To address the aforementioned issues, an electromagnetic active control device and vibration reduction control method for flange vibration reduction are proposed. This device can effectively reduce flange vibration by calculating and outputting a corresponding control current to an electromagnet based on the vibration signals of the flange and pipeline, thereby generating a corresponding electromagnetic force to suppress vibration.

[0004] The technical solution of this invention is as follows: an electromagnetic active control device for flange vibration reduction. Above the connection between the flange and the pipeline, and around the periphery of the pipeline, four electromagnets are arranged in an array around the pipeline at intervals. On the circular surface of the flange, the center line connecting a symmetrical electromagnet is taken as the X direction, and the perpendicular center line is taken as the Y direction. Two electromagnets in the X direction are connected in series as a group, and two electromagnets in the Y direction are connected in series as a group. The X-direction vibration sensor and the Y-direction vibration sensor measure the X-direction vibration and Y-direction vibration of the flange and the pipeline, respectively, and transmit the vibration signals to the X-direction vibration controller and the Y-direction vibration controller, respectively, through serial ports. The two vibration controllers have the same structure and control method and operate independently. The FPGA chip in the vibration controller receives the real-time vibration signal and processes the signal. The signal processing result is sent to the DSP chip in the vibration controller for analysis and calculation of the control current. The control current is sent to the driver board, which generates a corresponding PWM wave to control the IGBT to turn on, thereby supplying power to the electromagnets for vibration suppression.

[0005] The vibration reduction control method of the electromagnetic active control device for flange vibration reduction defines the desired system state as a vibration index in the DSP chip, and compares it periodically with the vibration signal received by the DSP chip at a frequency of 1kHz. When the current vibration meets the index requirements within the period, no control current is output; when the received vibration signal does not meet the vibration index requirements, the control current is calculated, and the control current is output to the drive board according to the control method to generate a corresponding PWM wave to control the IGBT to turn on and supply power to the electromagnet to generate the vibration-damping electromagnetic force.

[0006] Furthermore, when the received vibration signal does not meet the vibration index requirements, control current calculation is performed. The control current calculation includes time-domain control current calculation and frequency-domain analysis control current calculation. Time-domain control current calculation: the difference between the collected vibration signal and the defined vibration index is calculated, and the error signal is transmitted to the control algorithm for control quantity calculation.

[0007] Frequency domain analysis and control current calculation: Perform Fourier transform on the acquired vibration signal, and based on the transform result, sweep the vibration characteristic components within the range of 5Hz to 10kHz and capture them. Calculate the control current for the vibration components at the characteristic frequencies.

[0008] Furthermore, the control method outputs a control current to the drive board. The control method is performed alternately in two control cycles. In the first control cycle, the vibration amplitude is attenuated by using a time-domain control current. Then, in the next control cycle, the acquired attenuated vibration signal is analyzed in the frequency domain to calculate the control current, and the vibration signal at the characteristic frequency is captured for precise attenuation, thus completing the entire vibration control process.

[0009] The beneficial effects of the present invention are as follows: The electromagnetic active control device and vibration reduction control method for flange vibration reduction of the present invention construct a closed-loop feedback control loop for active control of flange vibration, thereby realizing active control of flange vibration; the control quantity is calculated from both the time domain and the frequency domain. First, the vibration amplitude is reduced from the time domain, and then the characteristic frequency is captured from the frequency domain for precise control, effectively improving control performance and accuracy. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the electromagnet arrangement scheme of the present invention;

[0011] Figure 2 This is a diagram showing the series connection method of the electromagnets in this invention;

[0012] Figure 3 This is a schematic diagram of the control logic of the electromagnetic active control device for flange vibration reduction according to the present invention. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0014] like Figure 1 The diagram shows the electromagnet arrangement. Above the flange and pipe connection, and around the perimeter of the pipe, four electromagnets are arranged in an array, spaced apart, around the pipe. Figure 2The diagram shows a series connection of electromagnets. On the flange's circular surface, the line connecting the centers of symmetrical electromagnets is taken as the X-direction, and the perpendicular line is taken as the Y-direction. Electromagnets are divided along the X and Y directions. Two electromagnets in the X-direction are connected in series as one group, and two electromagnets in the Y-direction are connected in series as another group. The electromagnetic active control device for flange vibration reduction includes an X-direction electromagnet, a Y-direction electromagnet, an X-direction vibration sensor, a Y-direction vibration sensor, an X-direction vibration controller, and a Y-direction vibration controller. During normal operation, the two sets of vibration sensors measure the X-direction and Y-direction vibrations of the flange and pipeline respectively. The vibration signals are transmitted via serial port to the FPGA chip in the controller for signal processing. The signal processing results are then transmitted to the DSP chip for analysis and calculation of the control current.

[0015] A vibration index (i.e., the desired system state) is defined in the DSP chip and periodically compared with the vibration signal received by the DSP chip at a frequency of 1kHz. If the current vibration meets the index requirements within a period, no control current is output. When the received vibration signal does not meet the vibration index requirements, the control current is calculated, and the control current is output to the driver board to generate a corresponding PWM wave that controls the IGBT to turn on, supplying power to the electromagnet to generate the vibration-damping electromagnetic force.

[0016] Two sets of electromagnets in the Y direction and two sets of electromagnets in the X direction are connected in series, and each has its own corresponding X-direction vibration controller and Y-direction vibration controller, which outputs control current to the corresponding electromagnet. By dividing the electromagnets into X and Y directions, they can be controlled independently. This method allows for independent control of vibrations in different directions without affecting the system state in the other direction.

[0017] When the vibration signal received by the DSP does not meet the performance requirements, both time-domain analysis and frequency-domain analysis are used to calculate the control current.

[0018] 1. Time-domain control current calculation: The difference between the collected vibration signal and the defined vibration index is calculated, and the error signal is transmitted to the control algorithm for control quantity calculation.

[0019] 2. Frequency domain analysis and control current calculation: Perform Fourier transform on the collected vibration signal, and sweep and capture the characteristic components of the vibration within 5Hz-10kHz based on the transformation results. Control the vibration components at one or more frequencies.

[0020] The two control methods described above are performed alternately within two control cycles. First, the vibration amplitude is attenuated from a time-domain perspective. In the next control cycle, the attenuated vibration signal is analyzed in the frequency domain to capture the vibration signal at the characteristic frequency for precise attenuation, thus completing the entire vibration control process.

[0021] The two vibration controllers have identical structures, each with its own independent signal board, control board, drive board, power amplifier unit, supporting capacitor, and matching circuit components, enabling them to operate independently without affecting each other.

[0022] The controller itself includes an external power interface for receiving DC-330V and DC-110V power. The DC-110V power is connected to the power module and, after being stepped down, is used for the signal receiving, processing, and transmission modules, as well as the control module and sensor unit. The DC-330V power is used to drive the main circuit.

[0023] During normal operation, the vibration control logic in the Y direction is consistent with that in the X direction. The following explanation uses the Y-direction vibration control as an example. Figure 3 As shown, the Y-direction vibration sensor collects real-time Y-direction vibration signals from the flange and pipeline, transmits them to the controller FPGA chip via serial port for signal processing, and then transmits the processing results to the DSP for calculation. When calculating the control current, firstly, in the first control cycle, the vibration signal is compared with the defined vibration index signal from the time domain perspective, and the difference is calculated. The error signal obtained from the difference is fed into the control algorithm for calculation, and the corresponding control current is output to the driver board to generate a corresponding PWM wave to control the IGBT to turn on, supplying power to the electromagnet for vibration suppression. Secondly, in the second control cycle, the vibration signal is subjected to Fourier transform to capture the vibration components at the characteristic frequency to calculate the control current, and the corresponding control current is also output to the driver board, thus supplying power to the electromagnet in the same way for vibration suppression. The two control cycles constitute a large control cycle, thereby achieving precise control of the vibration-suppressing electromagnetic force.

[0024] Furthermore, when the collected vibration sensor signal meets the requirements, no control current is output, that is, no electromagnetic force is generated to suppress vibration.

[0025] The embodiments described above merely illustrate specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A vibration reduction control method for an electromagnetic active control device used for flange vibration reduction, characterized in that, Above the flange and pipe connection, around the pipe, four electromagnets are arranged in an array around the pipe at intervals. On the flange surface, the center line of a symmetrical electromagnet is taken as the X direction, and the perpendicular center line is taken as the Y direction. Two electromagnets in the X direction are connected in series, and two electromagnets in the Y direction are connected in series. The X-direction vibration sensor and the Y-direction vibration sensor measure the X-direction vibration and Y-direction vibration of the flange and the pipe, respectively, and transmit the vibration signals to the X-direction vibration controller and the Y-direction vibration controller, respectively, through the serial port. The two vibration controllers have the same structure and control method and operate independently. The FPGA chip in the vibration controller receives the real-time vibration signal and processes the signal. The signal processing result is sent to the DSP chip in the vibration controller for analysis and calculation of the control current. The control current is sent to the driver board, which generates a corresponding PWM wave to control the IGBT to turn on, supplying power to the electromagnets for vibration suppression. The desired system state is defined as a vibration index in the DSP chip, and is periodically compared with the vibration signal received by the DSP chip at a frequency of 1kHz. When the current vibration meets the index requirements within the period, no control current is output; when the received vibration signal does not meet the vibration index requirements, the control current is calculated, and the control current is output to the driver board according to the control method to generate a corresponding PWM wave to control the IGBT to turn on and power the electromagnet to generate the vibration damping electromagnetic force. When the received vibration signal does not meet the vibration index requirements, a control current calculation is performed. This control current calculation includes time-domain control current calculation and frequency-domain analysis control current calculation. Time-domain control current calculation: The difference between the collected vibration signal and the defined vibration index is calculated, and the error signal is transmitted to the control algorithm to calculate the control quantity; Frequency domain analysis and control current calculation: Perform Fourier transform on the acquired vibration signal, and based on the transform result, sweep the vibration characteristic components within the range of 5Hz to 10kHz and capture them. Calculate the control current for the vibration components at the characteristic frequencies.

2. The vibration reduction control method of the electromagnetic active control device for flange vibration reduction as described in claim 1, characterized in that, The control method outputs a control current to the drive board. The control method is performed alternately in two control cycles. In the first control cycle, the vibration amplitude is attenuated by using time-domain control current. Then, in the next control cycle, the acquired attenuated vibration signal is analyzed in the frequency domain to calculate the control current. The vibration signal at the characteristic frequency is captured and accurately attenuated to complete the entire vibration control process.

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