Rotating Machinery

Abstract

To provide a vibration damping device and a rotation machine that can achieve improved damping performance.SOLUTION: A vibration damping device includes: a vibration control piezoelectric element that is provided at a rotating body, can generate electrical power with the vibration of the rotating body to store electrical charge in itself, and can apply force to the rotating body by its own generated electrical power; a sensor piezoelectric element that is provided at the rotating body and generates electrical power with the vibration of the rotating body; and a vibration control circuit that is provided at the rotating body, opens and closes the vibration control piezoelectric element according to a signal based on the electrical power generated by the sensor piezoelectric element, thereby synchronizing the phases of current and voltage in the vibration control piezoelectric element.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This disclosure 、 Related to rotating machinery. [Background technology]

[0002] Patent Document 1 discloses an active vibration control device that can be used for mechanical structures such as turbine rotor blades. The active vibration control device includes a strain oscillator that has a sensor function and an actuator function, and a control means that detects and calculates a sensor signal from the strain oscillator, and applies a vibration control signal to the strain oscillator, causing the strain oscillator to function as an actuator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 1-135248 Summary of the Invention [Problem to be solved by the invention]

[0004] In the active vibration control device described in Patent Document 1, for example, when the vibration control target is a rotating body, it is necessary to transmit power supply and vibration control signals from the stationary side using a slip ring or the like. However, when the rotating body has a high rotation speed, it becomes difficult to transmit power supply and vibration control signals. As a result, there are cases where sufficient damping performance cannot be obtained.

[0005] The present disclosure has been made to solve the above problems, and provides a method for improving damping performance. R The object of the present invention is to provide a rotating machine. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure Rotating Machinery teeth, a rotating body;a vibration damping device comprising: a vibration damping piezoelectric element provided on a rotating body, capable of generating electric power in response to vibration of the rotating body, storing an electric charge therein, and capable of applying a force to the rotating body with the electric power generated by the element; a sensor piezoelectric element provided on the rotating body, generating electric power in response to vibration of the rotating body; and a vibration damping circuit provided on the rotating body, which opens and closes the vibration damping piezoelectric element in response to a signal based on the electric power generated in the sensor piezoelectric element, thereby aligning the phases of the current and voltage of the vibration damping piezoelectric element. a microcomputer that transmits a signal to the vibration suppression circuit to open or close the vibration suppression circuit in response to vibration of the rotating body; and a battery that drives the microcomputer. . [Effects of the Invention]

[0008] This disclosure of According to the rotating machine, the damping performance can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a gas turbine according to a first embodiment of the present disclosure. [Figure 2] 1 is a schematic diagram of a rotor blade provided with a vibration damping device according to a first embodiment of the present disclosure. [Figure 3] 3A to 3C are diagrams illustrating a forming material for a rotor blade according to the first embodiment of the present disclosure, and an embedding of a vibration-damping piezoelectric element and a sensor piezoelectric element. [Figure 4] 1 is a schematic diagram showing the arrangement of a vibration-damping piezoelectric element and a sensor piezoelectric element according to a first embodiment of the present disclosure. FIG. [Figure 5] 3 is a diagram schematically illustrating the connection between a vibration damping piezoelectric element, a sensor piezoelectric element, and a vibration damping circuit according to the first embodiment of the present disclosure. FIG. [Figure 6] FIG. 2 is a diagram illustrating switching by a vibration suppression circuit according to the first embodiment of the present disclosure. [Figure 7] FIG. 2 is a diagram illustrating switching by a vibration suppression circuit according to the first embodiment of the present disclosure. [Figure 8] 5A and 5B are diagrams illustrating the effect of aligning the phases of current and voltage in the vibration damping piezoelectric element according to the first embodiment of the present disclosure. [Figure 9]FIG. 10 is a schematic diagram showing the arrangement of a vibration-damping piezoelectric element and a sensor piezoelectric element according to a modified example of the first embodiment of the present disclosure. [Figure 10] FIG. 10 is a diagram schematically illustrating the connection between a vibration damping piezoelectric element, a sensor piezoelectric element, and a vibration damping circuit according to a second embodiment of the present disclosure. [Figure 11] FIG. 10 is a diagram schematically illustrating the connection between a vibration damping piezoelectric element, a sensor piezoelectric element, and a vibration damping circuit according to a third embodiment of the present disclosure. [Figure 12] FIG. 10 is a diagram schematically illustrating connections between a vibration damping piezoelectric element, a sensor piezoelectric element, and a vibration damping circuit according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] First Embodiment Hereinafter, a vibration damping device 20 according to a first embodiment of the present disclosure and a gas turbine 1 (rotary machine) provided with the vibration damping device 20 will be described with reference to FIGS.

[0011] (Gas Turbine) 1 is used in, for example, an aircraft propulsion jet engine, a power generation gas turbine, etc. The gas turbine 1 includes a compressor 2 that generates compressed air, a combustor 3 that mixes fuel with the compressed air and burns the fuel to generate combustion gas G, a turbine 4 that is driven by the combustion gas G, and a vibration damping device 20 that damps vibrations of a rotating body inside the compressor 2.

[0012] (Compressor) The compressor 2 includes a rotor 10 (a rotating body) and a casing 5.

[0013] (Rotor) The rotor 10 has a rotating shaft 11 and a rotor blade stage 12. The rotating shaft 11 is formed in a columnar shape extending along an axis O.

[0014] Hereinafter, the axis O of the rotating shaft 11 may be simply referred to as the "axis O." Furthermore, the direction of the axis O of the rotating shaft 11 may be simply referred to as the "axis O direction," the radial direction of the axis O may be simply referred to as the "radial direction," and the circumferential direction of the axis O may be simply referred to as the "circumferential direction." The rotary shaft 11 is rotatable around an axis O.

[0015] A plurality of rotor blade stages 12 are arranged on the outer peripheral surface of the rotating shaft 11 at intervals in the direction of the axis O. Each rotor blade stage 12 has a plurality of rotor blades 13 arranged on the outer peripheral surface of the rotating shaft 11 at intervals in the circumferential direction. The rotor 10 is also provided with a vibration damping device 20 that damps vibrations of the rotor 10. The configurations of the rotor 10 and the vibration damping device 20 will be described in detail later.

[0016] The casing 5 covers the rotor 10 from the outer periphery. The casing 5 is formed in a cylindrical shape centered on the axis O. A plurality of stator vane stages 6 are provided on the inner circumferential surface of the casing 5 and arranged at intervals in the direction of the axis O. These stator vane stages 6 are arranged alternately with respect to the above-mentioned rotor blade stages 12 in the direction of the axis O. Each stator vane stage 6 has a plurality of stator vanes 6a arranged at intervals in the circumferential direction on the inner circumferential surface of the casing 5.

[0017] (Combustor) The combustor 3 is provided between the compressor 2 and the turbine 4 that continues downstream (to the right in FIG. 1). The compressed air generated by the compressor 2 is mixed with fuel inside the combustor 3 to form premixed gas. This premixed gas is combusted inside the combustor 3 to generate high-temperature, high-pressure combustion gas G, which is then introduced into the turbine 4.

[0018] (Turbine) The turbine 4 includes a turbine rotor 7 , a turbine casing 8 , and a retaining ring 9 .

[0019] (Turbine rotor) The turbine rotor 7 extends in the direction of an axis O and is rotatable around the axis O. The turbine rotor 7 has a turbine rotary shaft 7a and a plurality of turbine rotor blade stages 7b. The turbine rotating shaft 7a is formed in a columnar shape extending along the axis O. The turbine rotating shaft 7a is integrally connected to the rotating shaft 11 in the direction of the axis O. As a result, the turbine rotor 7 forms a gas turbine rotor that rotates around the axis O together with the rotor 10.

[0020] The multiple turbine rotor blade stages 7b are provided on the outer peripheral surface of the turbine rotary shaft 7a and are arranged at intervals in the direction of the axis O. Each turbine rotor blade stage 7b has multiple turbine rotor blades (not shown) arranged at intervals in the circumferential direction on the outer peripheral surface of the turbine rotary shaft 7a.

[0021] (Turbine casing) The turbine casing 8 covers the turbine rotor 7 from the outer periphery side. The turbine casing 8 is formed in a cylindrical shape centered on the axis O. On the inner circumferential surface of the turbine casing 8, a plurality of turbine stator vane stages 8a are provided, which are arranged at intervals in the direction of the axis O. These turbine stator vane stages 8a are arranged alternately with the turbine rotor blade stages 7b in the direction of the axis O. Each turbine stator vane stage 8a has a plurality of turbine stator vanes (not shown) arranged at intervals in the circumferential direction near the inner circumferential surface of the turbine casing 8.

[0022] (retention ring) The retaining ring 9 is provided in an annular shape over the inner circumferential surface of the turbine casing 8. The retaining ring 9 is provided to prevent the high-temperature, high-pressure combustion gas G from directly contacting the turbine casing 8. The same number of retaining rings 9 as the number of turbine rotor blade stages 7b are provided on the inner circumferential surface of the turbine casing 8 so as to correspond to the turbine rotor blade stages 7b.

[0023] (Detailed rotor configuration) The configuration of the rotor 10 of the compressor 2 will be described in detail below. 2, an attachment portion 11a is provided on the outer peripheral surface of the rotating shaft 11 of the rotor 10. The attachment portion 11a protrudes radially outward from the outer peripheral surface of the rotating shaft 11. A rotor blade 13 is attached to the attachment portion 11a. 2 shows the rotor blade 13 from the opposite side to that in FIG.

[0024] (moving blade) The rotor blades 13 are formed, for example, from CFRP (Carbon Fiber Reinforced Plastics). The rotor blades 13 are formed by laminating multiple sheets of composite material 14 (prepreg) (see FIG. 3). The rotor blades 13 are an example of a "laminate portion." Vibrations occur in the rotor blades 13 as the rotor 10 rotates. The rotor 10 is provided with a vibration damping device 20 to damp the vibrations of the rotor blades 13.

[0025] (Vibration damping device) The vibration damping device 20 includes a vibration damping piezoelectric element 21, a sensor piezoelectric element 22, and a vibration damping circuit 30.

[0026] (vibration damping piezoelectric element) As shown in Figure 3, the vibration-damping piezoelectric elements 21 are embedded inside the rotor blade 13 by hollowing out a number of sheets of the composite material 14 that constitutes the rotor blade 13, the number of which corresponds to the thickness of the vibration-damping piezoelectric elements 21. The vibration-damping piezoelectric elements 21 are capable of generating electric power in response to the vibration of the rotor blade 13 and storing an electric charge therein. Furthermore, the vibration-damping piezoelectric elements 21 can apply a force to the rotor using the electric power they generate.

[0027] (Piezoelectric element for sensors) Similar to the vibration-damping piezoelectric elements 21, the sensor piezoelectric elements 22 are embedded inside the rotor blade 13 by hollowing out the sheet-like composite material 14 that constitutes the rotor blade 13 in a number corresponding to the thickness of the sensor piezoelectric elements 22. The sensor piezoelectric elements 22 generate electricity in response to the vibration of the rotor blade 13.

[0028] 4, the sensor piezoelectric element 22 and the vibration-damping piezoelectric element 21 are provided in the rotor blade 13 at positions where they overlap in the thickness direction D of the rotor blade 13. In this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are embedded on the front and back of the rotor blade surface at the same position.

[0029] (Vibration suppression circuit) The vibration suppression circuit 30 is provided on the mounting portion 11a located on the root side of the rotor blade 13. The vibration suppression circuit 30 is electrically connected to the vibration suppression piezoelectric element 21 and the sensor piezoelectric element 22 by wiring 23. The vibration suppression circuit 30 aligns the phases of the current and voltage of the vibration suppression piezoelectric element 21 by opening and closing the vibration suppression piezoelectric element 21 in response to a signal based on the power generated by the sensor piezoelectric element 22. As shown in FIG. 5, the vibration suppression circuit 30 has a DC conversion unit 31, a phase adjustment unit 32, a signal shaping unit 33, and a switch unit 34.

[0030] (DC conversion section) The DC converter 31 is directly connected to the sensor piezoelectric element 22. The DC converter 31 converts the AC current generated by the sensor piezoelectric element 22 into a DC current.

[0031] (Phase adjustment section) The phase adjustment unit 32 is directly connected to the sensor piezoelectric element 22. The voltage generated by the sensor piezoelectric element 22 is input to the phase adjustment unit 32. The phase adjustment unit 32 is used to appropriately adjust the phase of the voltage of the sensor piezoelectric element 22. For example, the phase adjustment unit 32 adjusts the phase of the voltage of the sensor piezoelectric element 22 to match the phase of the current of the vibration control piezoelectric element 21. The phase adjustment unit 32 is, for example, an RC filter.

[0032] (Signal shaping section) The signal shaping unit 33 is connected to the DC conversion unit 31 and the phase adjustment unit 32. The signal shaping unit 33 receives power from the sensor piezoelectric element 22 via the DC conversion unit 31. The signal shaping unit 33 is driven by the power from the sensor piezoelectric element 22. The signal shaping unit 33 receives the voltage from the sensor piezoelectric element 22 via the phase adjustment unit 32. The signal shaping unit 33 amplifies the voltage from the sensor piezoelectric element 22 and shapes the waveform of the voltage from a sine wave to a rectangular wave.

[0033] (Switch section) The switch unit 34 is connected to the signal shaping unit 33. A voltage signal shaped by the signal shaping unit 33 is input to the switch unit 34. The switch unit 34 is provided with, for example, an FET or MOSFET, and these elements are driven by the input voltage signal. The switch unit 34 is directly connected to the vibration-damping piezoelectric element 21. The switch unit 34 opens and closes the vibration-damping piezoelectric element 21 in response to a signal based on the power generated by the sensor piezoelectric element 22. This shapes the waveform of the voltage of the vibration-damping piezoelectric element 21, and the phases of the current and voltage of the vibration-damping piezoelectric element 21 are aligned.

[0034] (Natural frequency of the electrical system) The vibration damping device 20 is designed so that the natural frequency of the entire electrical system is sufficiently higher than the natural frequency of the rotor blades 13 .

[0035] (Action and effect) The operation of the vibration damping device 20 and the gas turbine 1 provided with the vibration damping device 20 will be described below mainly with reference to Fig. 6 to Fig. 8. Fig. 6 and Fig. 7 show an RCL circuit in which the vibration damping piezoelectric element 21 and the switch unit 34 of the vibration damping circuit 30 are simplified. Fig. 8 shows the change over time t in phase of the current ip and voltage Va of the vibration damping piezoelectric element 21. In Fig. 8, the voltage Va affected by the opening and closing of the switch unit 34 is shown by a solid line, and the voltage Va not affected by the opening and closing of the switch unit 34 is shown by a dashed line.

[0036] In this embodiment, the vibration damping device 20 comprises a vibration damping piezoelectric element 21 that is provided on the rotor blade 13, is capable of generating electricity in response to the vibration of the rotor blade 13, storing an electric charge therein, and is capable of applying a force to the rotor blade 13 using the electricity that it generates; a sensor piezoelectric element 22 that is provided on the rotor blade 13 and generates electricity in response to the vibration of the rotor blade 13; and a vibration damping circuit 30 that is provided on the rotating shaft 11 and opens and closes the vibration damping piezoelectric element 21 in response to a signal based on the electricity generated by the sensor piezoelectric element 22, thereby aligning the phases of the current and voltage of the vibration damping piezoelectric element 21.

[0037] According to this embodiment, the vibration-damping piezoelectric element 21 generates electric power in response to the vibration of the rotor blade 13. The sensor piezoelectric element 22 also generates electric power in response to the vibration of the rotor blade 13. The vibration-damping circuit 30 opens and closes in response to a signal based on the electric power generated by the sensor piezoelectric element 22.

[0038] The vibration-damping piezoelectric element 21 functions as a current source that generates current due to the vibration of the rotor blade 13, and as a capacitor that stores electric charge. As shown in Figure 6, when the switch unit 34 is open, when electric power is generated in the vibration-damping piezoelectric element 21 due to the vibration of the rotor blade 13, a current ip flows in the vibration-damping piezoelectric element 21 and an electric charge Q is stored in the vibration-damping piezoelectric element 21.

[0039] 7, when the switch unit 34 is closed, the charge Q stored in the vibration control piezoelectric element 21 is released, and the charge Q of the vibration control piezoelectric element 21 is reversed. That is, the polarity of the voltage Va of the vibration control piezoelectric element 21 is reversed.

[0040] When the switch section 34 is not opened or closed, as shown in FIG. 8, the current ip and voltage Va (waveform indicated by the broken line) of the vibration control piezoelectric element 21 are out of phase with each other by 90 degrees. In this embodiment, the switch unit 34 opens and closes the vibration-damping piezoelectric element 21 in response to a signal based on the power generated by the sensor piezoelectric element 22. The sensor piezoelectric element 22 is provided on the rotor blade 13, just like the vibration-damping piezoelectric element 21. Therefore, the frequency of the power generated by the sensor piezoelectric element 22 is close to the frequency of the power derived from the vibration-damping piezoelectric element 21. Furthermore, since the natural frequency of the entire electrical system of the vibration damping device 20 is higher than the natural frequency of the rotor blade 13, the frequencies of the power generated by the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are both close to the frequency of the rotor blade 13. Therefore, the switch unit 34 can open and close (switch) the vibration-damping piezoelectric element 21 at approximately the same frequency as the frequency of the power of the vibration-damping piezoelectric element 21.

[0041] As a result, as shown in FIG. 8 , when the phase of the current i p of the vibration-damping piezoelectric element 21 is inverted, the switch unit 34 changes from an open state to a closed state, thereby inverting the phase of the voltage Va of the vibration-damping piezoelectric element 21. When the phase of the voltage Va of the vibration-damping piezoelectric element 21 is inverted, the switch unit 34 returns to the open state. This opening and closing operation of the switch unit 34 is performed every time the phase of the current i p of the vibration-damping piezoelectric element 21 is inverted. Therefore, the phases of the current i p and voltage Va of the vibration-damping piezoelectric element 21 are always aligned. As a result, a vibration-damping force proportional to the structural velocity is applied to the rotor blade 13 from the vibration-damping piezoelectric element 21. The vibration of the rotor blade 13 caused by the rotation of the rotor 10 is damped by the vibration-damping force of the vibration-damping piezoelectric element 21. Therefore, the vibration damping device 20 of this embodiment can improve damping performance.

[0042] Furthermore, according to this embodiment, the vibration damping device 20 can supply its own power and control signals for driving it. This eliminates the need to supply power from an external source using a slip ring or the like. Furthermore, because the vibration damping device 20 does not use a sensor actuator, the vibration damping device 20 can be driven well even when the rotor 10 rotates at high speed. Furthermore, compared to a mechanism that uses a damper or the like to damp the rotor blades 13, there are fewer restrictions on the locations where damping is applied. Furthermore, because the basic driving of the vibration damping device 20 is completed within the vibration damping device 20, there is no need to tune the vibration damping device 20, and the vibration damping device 20 can exhibit high robustness.

[0043] In this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are provided in the rotor blade 13 at positions where they overlap in the thickness direction D of the rotor blade 13 .

[0044] According to this embodiment, the distortion amounts of the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are equal to each other for the mode of the rotor blade 13. This facilitates vibration damping of the rotor blade 13. Therefore, the damping performance of the vibration damping device 20 can be further improved.

[0045] In this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are embedded inside the rotor blade 13 .

[0046] According to this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 can be attached to the rotor 10 without damaging the surface shape of the rotor blade 13. This allows the vibration damping device 20 to be installed on the rotor 10 without degrading the aerodynamic performance of the rotor blade 13.

[0047] In this embodiment, the rotor 10 has moving blades 13 formed by laminating a plurality of sheet-like composite materials 14 , and the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are embedded inside the moving blades 13 .

[0048] According to this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 can be formed by hollowing out a plurality of sheets of the composite material 14 having a thickness equivalent to that of the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22, and then embedding the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22. This makes it possible to easily install the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 inside the rotor blade 13.

[0049] In the first embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 are provided in positions within the rotor blade 13 where they overlap in the thickness direction D of the rotor blade 13, but this is not limited to this. As shown in Fig. 9, in a portion where there is no thickness of the rotor blade 13, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 may be adjacent to each other and arranged on the same surface.

[0050] Second Embodiment A vibration damping device 220 according to a second embodiment of the present disclosure will be described below with reference to Fig. 10. Configurations similar to those in the first embodiment described above will be given the same names and reference numerals, and descriptions thereof will be omitted as appropriate.

[0051] 10, a plurality of (for example, two) vibration-damping piezoelectric elements 21 are provided in one vibration-damping circuit 30. The plurality of vibration-damping piezoelectric elements 21 are connected in parallel to the vibration-damping circuit 30. Furthermore, only one sensor piezoelectric element 22 is provided in one vibration-damping circuit 30.

[0052] In this embodiment, a plurality of vibration-damping piezoelectric elements 21 are connected in parallel to the vibration-damping circuit 30. According to this embodiment, the vibration damping device 20 can increase the vibration damping force controlled by one vibration damping circuit 30. The vibration damping device 20 can increase and maximize the vibration damping force of a specific mode.

[0053] Third Embodiment A vibration damping device 320 according to a third embodiment of the present disclosure will be described below with reference to Fig. 11. Configurations similar to those in the first embodiment described above will be given the same names and reference numerals, and descriptions thereof will be omitted as appropriate.

[0054] 11, a plurality of vibration-damping piezoelectric elements 21 and sensor piezoelectric elements 22 are provided, and a plurality of vibration-damping circuits 30 are provided. One vibration-damping piezoelectric element 21 and one sensor piezoelectric element 22 are provided for each vibration-damping circuit 30. Therefore, the plurality of vibration-damping piezoelectric elements 21 are independently controlled by different vibration-damping circuits 30.

[0055] In this embodiment, a plurality of vibration-damping piezoelectric elements 21 are provided, and a plurality of vibration-damping circuits 30 are provided for each vibration-damping piezoelectric element 21 .

[0056] Although the optimum arrangement differs for each mode, according to this embodiment, the vibration damping device 20 can provide a vibration damping effect for a wide range of modes.

[0057] In the second and third embodiments, the vibration damping piezoelectric element 21, the sensor piezoelectric element 22, and the vibration damping circuit 30 can be changed by changing the way the wiring 23 taken out to the outside of the rotor blade 13 is connected, and can be made switchable using a switch box or the like.

[0058] <Fourth embodiment> A gas turbine 401 according to a fourth embodiment of the present disclosure will be described below with reference to Fig. 12. Configurations similar to those in the first embodiment described above will be denoted by the same names and reference numerals, and descriptions thereof will be omitted as appropriate.

[0059] As shown in FIG. 12 , the gas turbine 401 further includes a microcomputer 440 and a battery 441. The microcomputer 440 is provided outside the rotor 10. The microcomputer 440 transmits a signal to the vibration suppression circuit 30 to open or close the vibration suppression circuit 30 in accordance with the vibration of the rotor blade 13. In this embodiment, the microcomputer 440 is connected to the signal shaping unit 33 of the vibration suppression circuit 30. The operation mode of the microcomputer 440 can be changed wirelessly from the stationary side. The battery 441 is provided outside the rotor 10. The battery 441 is provided to drive the microcomputer 440. The battery 441 is, for example, a storage battery.

[0060] In this embodiment, the gas turbine 401 further includes a microcomputer 440 that transmits a signal to the vibration control circuit 30 to open or close the vibration control circuit 30 in response to the vibration of the rotor blade 13, and a battery 441 that drives the microcomputer 440.

[0061] According to this embodiment, because the microcomputer 440 and battery 441 are provided as backups, even if the vibration of the rotor blade 13 is small and no power is generated by the sensor piezoelectric element 22, the vibration control circuit 30 can be driven to align the phases of the current ip and voltage Va of the vibration control piezoelectric element 21. The microcomputer 440 does not require a large amount of power because it is only used to drive the switch unit 34 of the vibration control circuit 30.

[0062] Furthermore, when it is desired to strongly damp the vibration of the rotor blade 13, the microcomputer 440 can be used to open and close the switch section 34 at the optimal timing, thereby imparting a high damping effect to the vibration damping device 20 and further improving the damping effect of the vibration damping device 20.

[0063] Furthermore, since the battery 441 is a storage battery, power other than that required for switching is charged to the battery 441. The excess output charged to the battery 441 can be used to drive the microcomputer 440 when necessary.

[0064] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the vibration damping device 20 is described as being installed in a gas turbine 1, but this is not limited thereto, and the vibration damping device 20 may also be installed in other rotating machines, such as a propeller of a ship or aircraft.

[0065] In the above embodiment, the vibration damping device 20 is described as being provided on the rotor blade 13 of the rotor 10, but this is not limited to this, and the vibration damping device 20 may be provided at another location on the rotor 10 side, such as the rotating shaft 11 of the rotor 10.

[0066] In the above embodiment, the rotor blade 13 is formed of, for example, CFRP, but this is not limitative. For example, the rotor blade 13 may be formed of a metal material such as stainless steel.

[0067] <Additional Notes> The vibration damping devices 20, 220, 320 and rotating machines described in the respective embodiments can be understood, for example, as follows.

[0068] (1) The vibration damping device 20, 220, 320 of the first aspect comprises a vibration damping piezoelectric element 21 provided on a rotating body, capable of generating electric power in response to vibrations of the rotating body and storing an electric charge therein, and capable of applying a force to the rotating body using the electric power generated by the element; a sensor piezoelectric element 22 provided on the rotating body, generating electric power in response to vibrations of the rotating body; and a vibration damping circuit 30 provided on the rotating body, opening and closing the vibration damping piezoelectric element 21 in response to a signal based on the electric power generated by the sensor piezoelectric element 22, thereby aligning the phases of the current ip and voltage Va of the vibration damping piezoelectric element 21. An example of the rotating body is the rotor 10 of the compressor 2.

[0069] According to this aspect, the vibration-damping piezoelectric element 21 generates electric power in response to the vibration of the rotating body. The sensor piezoelectric element 22 also generates electric power in response to the vibration of the rotating body. The vibration-damping circuit 30 aligns the phases of the current and voltage of the vibration-damping piezoelectric element 21 by opening and closing the vibration-damping circuit 30 in response to a signal based on the electric power generated by the sensor piezoelectric element 22. As a result, a vibration-damping force proportional to the structural velocity acts on the rotating body from the vibration-damping piezoelectric element 21.

[0070] (2) The vibration damping device 220 of the second aspect is the vibration damping device 220 of (1), in which a plurality of the vibration damping piezoelectric elements 21 are provided, and the plurality of the vibration damping piezoelectric elements 21 may be connected in parallel to the vibration damping circuit 30.

[0071] According to this aspect, the vibration damping device 220 can increase the vibration damping force in a specific mode.

[0072] (3) The vibration damping device 320 of the third aspect is the vibration damping device 320 of (1), in which a plurality of the vibration damping piezoelectric elements 21 are provided, and a plurality of the vibration damping circuits 30 are provided for each of the vibration damping piezoelectric elements 21.

[0073] Although the optimum arrangement differs for each mode, according to this embodiment, the vibration damping device 320 can provide a vibration damping effect for a wide range of modes.

[0074] (4) The vibration damping device 20 of the third aspect is a vibration damping device 20 of any one of (1) to (3), and the vibration damping piezoelectric element 21 and the sensor piezoelectric element 22 may be arranged in a position within the rotating body where they overlap in the thickness direction D of the rotating body.

[0075] According to this aspect, the amounts of strain in the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 for the mode of the rotor are equal, which makes it easier to damp the vibration of the rotor.

[0076] (5) A rotary machine according to a fifth aspect includes the vibration damping device 20, 220, 320 according to any one of (1) to (4) and the rotating body. An example of a rotary machine is a gas turbine 1,401.

[0077] (6) A sixth aspect of the rotating machine is the rotating machine of (5), in which the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 may be embedded inside the rotor.

[0078] According to this aspect, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 can be attached to the rotating body without damaging the surface shape of the rotating body.

[0079] (7) A seventh aspect of the rotating machine is a rotating machine of (6), wherein the rotating body has a laminated portion in which multiple sheet-like composite materials 14 are stacked, and the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 may be embedded inside the laminated portion. An example of the laminated portion is the rotor blade 13 of the rotor 10.

[0080] According to this embodiment, the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22 can be embedded in a plurality of sheets of the composite material 14 having thicknesses corresponding to the thicknesses of the vibration-damping piezoelectric element 21 and the sensor piezoelectric element 22.

[0081] (8) The rotating machine of the eighth aspect is a rotating machine of any one of (5) to (7), and may further include a microcomputer 440 that sends a signal to the vibration control circuit 30 to open or close the vibration control circuit 30 in response to the vibration of the rotating body, and a battery 441 that drives the microcomputer 440.

[0082] According to this embodiment, even if the vibration of the rotating body is small and no power is generated by the sensor piezoelectric element 22, the vibration control circuit 30 can be driven to align the phases of the current ip and voltage Va of the vibration control piezoelectric element 21. [Explanation of symbols]

[0083] DESCRIPTION OF SYMBOLS 1...gas turbine 2...compressor 3...combustor 4...turbine 5...casing 6...stationary vane stage 6a...stationary vane 7...turbine rotor 7a...turbine rotating shaft 7b...turbine moving blade stage 8...turbine casing 8a...turbine stator vane stage 9...retaining ring 10...rotor 11...rotating shaft 11a...mounting portion 12...moving blade stage 13...moving blade 14...composite material 20...vibration damping device 21...vibration damping piezoelectric element 22...piezoelectric element for sensor 23...wiring 30...vibration damping circuit 31...DC conversion portion 32...phase adjustment portion 33...signal shaping portion 34...switch portion 440...microcomputer 441...battery D...thickness direction G...combustion gas O...axial line

Claims

1. A rotating body, a vibration damping device comprising: a vibration damping piezoelectric element provided on the rotating body, capable of generating electric power in response to vibration of the rotating body, storing electric charge therein, and capable of applying a force to the rotating body with the electric power generated by the element; a sensor piezoelectric element provided on the rotating body, generating electric power in response to vibration of the rotating body; and a vibration damping circuit provided on the rotating body, which opens and closes the vibration damping piezoelectric element in response to a signal based on the electric power generated in the sensor piezoelectric element, thereby aligning the phases of the current and voltage of the vibration damping piezoelectric element; a microcomputer that transmits a signal to the vibration suppression circuit to open or close the vibration suppression circuit in response to vibration of the rotating body; a battery for driving the microcomputer; A rotating machine comprising:

2. A plurality of the vibration-damping piezoelectric elements are provided, 2. The rotating machine according to claim 1, wherein a plurality of said vibration-damping piezoelectric elements are connected in parallel to said vibration-damping circuit.

3. A plurality of the vibration-damping piezoelectric elements are provided, 2. The rotary machine according to claim 1, wherein a plurality of said vibration suppression circuits are provided for each of said vibration suppression piezoelectric elements.

4. The rotary machine according to claim 1 , wherein the vibration-damping piezoelectric element and the sensor piezoelectric element are provided in the rotor at positions where they overlap in a thickness direction of the rotor.

5. 2. The rotating machine according to claim 1, wherein the vibration-damping piezoelectric element and the sensor piezoelectric element are embedded inside the rotor.

6. the rotating body has a laminated portion in which a plurality of sheet-like composite materials are laminated, The rotating machine according to claim 5 , wherein the vibration-damping piezoelectric element and the sensor piezoelectric element are embedded inside the laminated portion.

Images