Traveling wave excitation device and traveling wave excitation method

Abstract

A traveling-wave excitation method comprising, when exciting each of a plurality of blades (23) of a rotor (20) by each of a plurality of excitation sources (141 to 14N0) having a one-to-one correspondence with the plurality of blades (23) at a phase corresponding to an excitation signal input to each of the plurality of excitation sources (141 to 14N0), inputting, to a pair of excitation sources (141 to 14N0) which are of the plurality of excitation sources (141 to 14N0) and correspond to a pair of blades (23) which are of the plurality of blades (23) and have positions different from each other by 180° in the rotation direction of the rotor (20), the same excitation signals having the same phase when a number (Nd) of nodal diameters of vibration to be generated in the rotor (20) through the excitation of the plurality of blades (23) is an even number and the same excitation signals with opposite phases when the number (Nd) of nodal diameters is an odd number.

Description

[Technical Field]

[0001] The present disclosure relates to a traveling wave excitation device and a traveling wave excitation method. [Background technology]

[0002] A rotor blade installed in a jet engine or the like has a disk and a number of blades attached to the outer periphery of the disk. If there is variation in the natural frequency between the blades of the rotor blade due to the influence of the mass, rigidity, etc. of the blades, the resonant response of the rotor blade during rotation may become unexpectedly large, which may shorten the life of the rotor blade.

[0003] Patent Document 1 discloses a method for measuring blade vibration during blade rotation. The measured blade vibration can be used to determine the amplitude, phase, and frequency of the blade vibration, which are necessary for monitoring the blade vibration during blade rotation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-98584 Summary of the Invention [Problem to be solved by the invention]

[0005] Blade vibration of a rotating rotor blade is the rotor blade's vibratory response to the periodic excitation force generated in each blade by rotation. By exciting each blade of the rotor blade with a vibration that simulates the periodic excitation force during rotation, the rotor blade's vibratory response to the periodic excitation force of each blade can be reproduced.

[0006] The vibration response of a rotating rotor blade is a traveling wave. When a vibration response test of a rotor blade simulating the periodic excitation force during rotation is performed in a stationary state, each blade of the rotor blade is excited using a phase-controlled traveling wave signal, the vibration of each excited blade is measured, and the vibration response of the rotor blade in the mode to be measured is identified from the measured vibration. To vibrate each blade of the rotor blade, it is necessary to input phase-controlled signals from each channel of the signal source to multiple excitation sources corresponding to each blade.

[0007] An object of the present disclosure is to provide a traveling wave excitation device and a traveling wave excitation method that can excite all blades of a rotor blade system, the number of which exceeds the number of channels, with traveling wave excitation signals output from each channel by a signal source. [Means for solving the problem]

[0008] A traveling wave excitation device according to the present disclosure includes a plurality of excitation sources that correspond one-to-one to a plurality of blades of a rotor blade and excite the corresponding blades with phases corresponding to input excitation signals, a signal source that outputs the traveling wave excitation signals from a plurality of channels, each of which has a different phase for each channel, and a connection unit that connects a pair of the plurality of excitation sources corresponding to a pair of blades that are 180° apart in the rotation direction of the rotor blade to the same channel of the signal source. When the number of nodal diameters of vibrations generated in the rotor blade by excitation of the plurality of blades is even, the connection unit inputs the excitation signals output from one channel of the plurality of channels to the pair of excitation sources connected to the one channel in phase, respectively, and when the number of nodal diameters is odd, the connection unit inputs the excitation signals output from the one channel to the pair of excitation sources connected to the one channel in opposite phases.

[0009] The connection unit connects a plurality of excitation sources among the plurality of excitation sources to each of the channels of the signal source, and determines the number of nodal diameters Nd, the number of blades N0 of the rotor blades, and the number of excitation sources for each channel of the signal source. severalWhen the relationship of the number of connected vibration sources J0 is N0=n×J0 (where coefficient n is a natural number) and 2Nd=m×J0 (where coefficient m is an integer), if coefficient m is an even number, the vibration signal output from the one channel may be input to the plurality of vibration sources connected to the one channel in the same phase as when it was output from the one channel, and if coefficient m is an odd number, the vibration signal output from the one channel may be input to the plurality of vibration sources connected to the one channel with the phase alternately inverted between the same phase as when it was output from the one channel and an opposite phase, in the arrangement order in the rotation direction of a plurality of blades among the plurality of blades corresponding to the plurality of vibration sources.

[0010] The rotor blade may be a blisk in which the plurality of blades are integrally formed with a disk.

[0011] A traveling wave excitation method according to the present disclosure includes, when vibrating a plurality of blades of a rotor blade by a plurality of excitation sources corresponding one-to-one to the plurality of blades at phases according to excitation signals input to the plurality of excitation sources, the method comprising: inputting the same excitation signals in the same phase to a pair of the plurality of excitation sources corresponding to a pair of blades among the plurality of blades that are positioned 180° apart in the rotational direction of the rotor blade when the number of nodal diameters of vibrations generated in the rotor blade by excitation of the plurality of blades is even, and inputting the same excitation signals in opposite phases when the number of nodal diameters is odd. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to excite all of the rotor blades, the number of which exceeds the number of channels, with the traveling wave excitation signals output from each channel by the signal source. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a vibration response testing device according to one embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a circuit configuration of a main part of a switching unit of the vibration response testing device of FIG. [Figure 3] FIG. 3 is a diagram schematically showing the arrangement of the blades of the blisk of FIG. [Figure 4A] FIG. 4A is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of nodal diameters of vibrations generated in the blisk of FIG. 1 is four. [Figure 4B] FIG. 4B is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of node diameters of the vibrations generated in the blisk of FIG. 1 is two. [Figure 4C] FIG. 4C is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of node diameters of the vibrations generated in the blisk of FIG. 1 is 6. [Figure 5] FIG. 5 is a diagram schematically illustrating in-phase excitation signals input to a pair of excitation sources corresponding to a pair of blades that are positioned 180° apart on the blisk, when the number of nodal diameters of the vibration response generated in the blisk of FIG. 1 is an even number. [Figure 6A] FIG. 6A is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of node diameters of the vibrations generated in the blisk of FIG. 1 is three. [Figure 6B] FIG. 6B is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of nodal diameters of the vibrations generated in the blisk of FIG. 1 is 5. [Figure 6C] FIG. 6C is a diagram showing the phase relationship of vibrations generated in a pair of blades that are positioned 180° apart in the rotation direction of the blisk when the number of nodal diameters of the vibrations generated in the blisk of FIG. 1 is 7. [Figure 7] FIG. 7 is a diagram schematically showing vibration signals of opposite phases input to a pair of vibration sources corresponding to a pair of blades that are positioned 180° apart on the blisk, when the number of nodal diameters of vibration generated in the blisk of FIG. 1 is odd. [Figure 8]FIG. 8 is a diagram showing the relationship of the phase of the excitation signal output by the switch section of the switching unit in FIG. 2 to each pair of corresponding excitation sources to the phase at the time of output of each channel. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some exemplary embodiments will now be described with reference to the drawings, in which: Figure 1 is a diagram showing a vibration response testing device 10 for a blisk 20 according to one embodiment.

[0015] The vibration response testing apparatus 10 of the embodiment shown in Fig. 1 is an apparatus for performing a vibration response test on a blisk 20 serving as a rotor blade. The vibration response testing apparatus 10 implements the traveling wave excitation method according to the present disclosure and can constitute a traveling wave excitation apparatus according to the present disclosure.

[0016] The blisk 20 shown in Fig. 1 has a plurality of blades 23 integrally formed on the outer periphery of a disk 21. The blisk 20 shown in Fig. 1 is a simplified version for the purpose of explanation only. The number of blades 23 formed on the disk 21 is not limited to the number shown in Fig. 1. The vibration response test device 10 can also be used for vibration response testing of rotor blades (not shown) configured by fitting the dovetail of a blade onto the outer periphery of a disk.

[0017] The vibration response testing device 10 of this embodiment includes a control computer 110, a traveling wave excitation power supply 120 as a signal source, a switching unit 130 as a connection unit, an excitation unit 140, and a response measuring device 150.

[0018] The vibration unit 140 has a plurality of vibration sources. The vibration sources can be configured using, for example, a vibrator, a speaker, a vibrator, etc. The plurality of vibration sources correspond one-to-one to the plurality of blades 23 of the blisk 20.

[0019] A vibration signal of a phase-controlled traveling wave having the same frequency and amplitude is input to each vibration source of the vibration unit 140. Each vibration source is driven by the input vibration signal.

[0020] The traveling wave referred to here means a traveling wave in a broad sense. The traveling wave in a broad sense includes a traveling wave in a narrow sense, in which the phase advances in the positive direction (+x direction) over time, and a backward-moving wave, in which the phase advances in the negative direction (-x direction) over time. The traveling wave mentioned in the following explanation means a traveling wave in a broad sense.

[0021] Each excitation source of the vibration unit 140 driven by the excitation signal generates vibrations according to the waveform of the excitation signal. The vibrations generated by each excitation source excite the corresponding blades 23 of the blisk 20 facing each excitation source.

[0022] 1 are excited by the corresponding excitation sources, thereby generating vibrations in each blade 23 of the blisk 20 that simulate the periodic excitation force during rotation. The response measurement device 150 measures the vibration of each blade 23. The response measurement device 150 measures the vibration of each blade 23 in a non-contact manner, for example, by a conventionally known method of receiving a reflected wave of an electromagnetic wave for distance measurement irradiated onto the blade surface.

[0023] The switching unit 130 connects each excitation source of the excitation unit 140 to one of the multiple channels of the traveling wave excitation power supply 120. Each channel of the traveling wave excitation power supply 120 outputs a traveling wave excitation signal with a different phase for each channel. As shown in FIG. 2, the traveling wave excitation power supply 120 of this embodiment has M0 channels Ch.1 to Ch.M0 from 1 to M0. In this embodiment, the number of channels M0 of the traveling wave excitation power supply 120 is half the number N0 of blades of the blisk 20 of FIG. 1 (M0=N0 / 2).

[0024] 2, if each of the vibration sources of the vibration unit 140 is connected to each of the channels Ch.1 to Ch.M0 of the traveling wave vibration power supply 120, the vibration sources corresponding to half (M0=N0 / 2) of the blades 23 of the blisk 20 cannot be connected to the traveling wave vibration power supply 120. The vibration sources that cannot be connected to the traveling wave vibration power supply 120 cannot be driven by the vibration signal from the traveling wave vibration power supply 120 to vibrate the corresponding blades 23 in a phase according to the vibration signal.

[0025] In a typical rotor blade vibration response test, when some of the rotor blades are excited with a traveling wave excitation signal, standing waves are generated during the vibration of the excited blades, and the blades are excited in multiple modes, including not only the mode being measured but also modes not being measured. If the measured blade vibration includes vibrations in modes not being measured, it becomes difficult to identify the rotor blade vibration response in the mode being measured from the blade vibration measurement results, and the reliability of the test results for the rotor blade vibration response in the mode being measured decreases. In a rotor blade vibration response test, it is important to vibrate all of the rotor blades with a traveling wave excitation signal and concentrate the blade excitation in the mode being measured.

[0026] In the vibration response testing apparatus 10 of this embodiment, the switching unit 130 connects pairs of excitation sources of the excitation unit 140 to the channels Ch.1 to Ch.M0 of the traveling wave excitation power supply 120. The two excitation sources of each pair connected to the same channel Ch.1 to Ch.M0 are a pair of excitation sources corresponding to a pair of blades whose positions in the rotation direction of the blisk 20 are 180° apart.

[0027] The number of blades N0 of the blisk 20 is often an even number to maintain balance during rotation. As shown in Fig. 3, the blisk 20 has a pair of blades whose positions differ by 180° in the rotation direction R of the blisk 20. Blade numbers 1 and M0+1 and blade numbers M0 and N0 shown in Fig. 3 correspond to the pair of blades 23 whose positions differ by 180° in the rotation direction R of the blisk 20 in Fig. 1, respectively.

[0028] When a vibration response with the nodal diameter number Nd=4 is generated in the blisk 20, excitation forces are applied to a pair of blades 23 located 180° apart in the rotation direction R of the blisk 20 by excitation signals of the same amplitude and in the same phase, as shown in Fig. 4A. When vibration responses with the nodal diameter numbers Nd=2, 6 are generated in the blisk 20, excitation forces are applied to a pair of blades 23 located 180° apart in the rotation direction R of the blisk 20 by excitation signals of the same amplitude and in the same phase, as shown in Figs. 4B and 4C.

[0029] It can be seen that in order to generate a vibration response with an even nodal diameter number Nd in the blisk 20 by excitation simulating a periodic excitation force during rotation, a pair of excitation sources corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 should be driven with excitation signals of the same amplitude and in phase. Fig. 5 schematically shows excitation signals of the same phase input to a pair of excitation sources 141, 14M0+1 corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 when the nodal diameter number Nd of the vibration response to be generated in the blisk 20 is an even number.

[0030] When a vibration response with nodal diameter number Nd=3 is generated in the blisk 20, excitation forces are applied to a pair of blades 23 located 180° apart in the rotation direction R of the blisk 20 by excitation signals with the same amplitude and opposite phase, as shown in Fig. 6A. When vibration responses with nodal diameter numbers Nd=5, 7 are generated in the blisk 20, excitation forces are applied to a pair of blades 23 located 180° apart in the rotation direction R of the blisk 20 by excitation signals with the same amplitude and opposite phase, as shown in Fig. 6B and Fig. 6C.

[0031] It can be seen that in order to generate a vibration response with an odd nodal diameter number Nd in the blisk 20 by excitation simulating a periodic excitation force during rotation, a pair of excitation sources corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 should be driven with excitation signals of the same amplitude but opposite phases. Fig. 7 schematically shows excitation signals of opposite phases that are input to a pair of excitation sources 141, 14M0+1 corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 when the nodal diameter number Nd of the vibration response to be generated in the blisk 20 is odd.

[0032] The switching unit 130 in Fig. 1 can connect a plurality of excitation sources corresponding to a plurality of blades 23 of the blisk 20 to one channel of the traveling wave excitation power supply 120. In the example shown in Fig. 2, the switching unit 130 can connect a plurality of excitation sources corresponding to a plurality of blades 23 of the blisk 20 to one channel Ch.1 to Ch.M of the traveling wave excitation power supply 120. to 0 A pair of vibration sources corresponding to a pair of blades 23 of the blisk 20 that are 180° apart in position are connected to each other.

[0033] A pair of vibration sources 141, 14M0+1 corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 is connected to channel Ch.1 of the traveling wave vibration power supply 120 by the switching unit 130. A pair of vibration sources 142, 14M0+2 corresponding to a pair of blades 23 that are 180° apart in position on the blisk 20 is connected to channel Ch.2 by the switching unit 130. The pair of blades 23 corresponding to the pair of vibration sources 142, 14M0+2 is arranged next to the pair of blades 23 corresponding to the pair of vibration sources 141, 14M0+1 in the rotation direction R of the blisk 20.

[0034] To each channel from channel Ch.2 onwards, the switching unit 130 connects pairs of excitation sources 142, 14M0+2 and subsequent pairs of excitation sources in the arrangement order of the corresponding pairs of blades 23 in the rotation direction R of the blisk 20. To channel Ch.M0 of the traveling wave excitation power supply 120, the switching unit 130 connects the excitation sources 14M0, 14N corresponding to the pair of blades 23 arranged last in the arrangement order in the rotation direction R of the blisk 20. 0's The pairs are connected.

[0035] The traveling wave excitation power supply 120 can change the frequency of the excitation signal output from each channel Ch.1 to Ch.M0 and the phase difference between each channel Ch.1 to Ch.M0 according to the number of nodal diameters Nd of the vibration generated in the blisk 20 by exciting each blade 23.

[0036] Phase-controlled excitation signals of the same amplitude are input to each pair of excitation sources from channels Ch.1 to Ch.M0 connected by switching unit 130 of traveling wave excitation power supply 120. Switching unit 130 has switch sections 131 to 13M0. Each switch section 131 to 13M0 can switch the phase of the excitation signal input to the corresponding pair of excitation sources between the same phase and opposite phase.

[0037] Each of the switch units 131-13M0 can switch the phase of the excitation signal output from each of the channels Ch.1-Ch.M0 to either the same phase as when the signal was output from each of the channels Ch.1-Ch.M0 or the opposite phase to input the signal to the corresponding pair of excitation sources. The relationship between the phase of the excitation signal input by each of the switch units 131-13M0 to the corresponding pair of excitation sources and the phase when the signal was output from each of the channels Ch.1-Ch.M0 can be defined as shown in the table in FIG.

[0038] 8, the rows (horizontal) indicate the number of nodal diameters Nd of the vibration generated in the blisk 20, and the columns (vertical) indicate the number of excitation sources J0 connected to one channel Ch.1 to Ch.M0. The number of excitation sources J0 corresponds to the number of excitation sources connected to each channel of the signal source.

[0039] The phases of the excitation signals input to the pair of excitation sources corresponding to each switch unit 131-13M0 are either in phase or opposite phase. The relative phase difference of the excitation signals from each channel Ch.1-Ch.M0 output to the corresponding pair of excitation sources by each switch unit 131-13M0 needs to be a multiple of 180°.

[0040] The relative phase difference of the excitation signals input to each pair of excitation sources is expressed as 2×180°×Nd / J0. If the number of nodal diameters Nd and the number of excitation sources J0 satisfy 2×Nd / J0=m (where coefficient m is an integer), excitation signals can be input in phase or opposite phase to each corresponding pair of excitation sources by switching each switch unit 131 to 13M0. The numerical value in the box at the intersection of each row and column of the table in FIG. 8 is the value of 2×Nd / J0 mentioned above.

[0041] In this embodiment, one of the channels Ch.1 to Ch.M of the traveling wave excitation power supply 120 to 0 Since each pair of excitation sources is connected, the number of excitation sources J0 is 2. to 0 Connect The excitation sourceWhen the number J0 is two, the value of 2×Nd / J0 mentioned above is an integer (1.0 to 12.0) for all nodal diameter numbers Nd (Nd = 1 to 12) shown in Figure 8. Since the value of 2×Nd / J0 is an integer, the above condition that the coefficient m is an integer is met.

[0042] When the nodal diameter number Nd is an odd number, the coefficient m becomes an odd number, and the relative phase difference between the excitation signals input to each of the pair of excitation sources becomes an odd multiple of 180°. When the coefficient m is an odd number, the switching unit 130 switches each of the switch sections 131 to 13M0 so as to output the excitation signals in a phase opposite to the phase when they are output from each of the channels Ch.1 to Ch.M0.

[0043] When the nodal diameter number Nd is an even number, the coefficient m is an even number, and the relative phase difference between the excitation signals input to each of the pair of excitation sources is an even multiple of 180°. When the coefficient m is an even number, the switching unit 130 switches each of the switch sections 131 to 13M0 so as to output the excitation signals with the same phase as the phase when they are output from each of the channels Ch.1 to Ch.M0.

[0044] When the nodal diameter number Nd is an even number, the switching unit 130 switches each of the switch sections 131 to 13M0 so that the excitation signals are input in phase to each of the corresponding pairs of excitation sources. When the nodal diameter number Nd is an odd number, the switching unit 130 switches each of the switch sections 131 to 13M0 so that the excitation signals are input in opposite phase to each of the corresponding pairs of excitation sources.

[0045] Whether the nodal diameter number Nd is an even number or an odd number may be set in the switching unit 130 by a user who performs the test, for example, or may be set in the switching unit 130 by a signal from the control computer 110. The switching unit 130 switches each of the switches 131 to 13M0 depending on whether the set nodal diameter number Nd is an even number or an odd number, and switches the excitation signals input to each corresponding pair of excitation sources between the same phase and the opposite phase.

[0046] In the vibration response testing apparatus 10 of this embodiment, the vibration signals input to each pair of vibration sources connected to each channel Ch.1 to Ch.M0 of the traveling wave vibration power supply 120 can be switched between the same phase and opposite phase by the switching unit 130. In the vibration response testing apparatus 10, all of the blades 23 of the blisk 20, the number of blades of which is greater than the number of channels Ch.1 to Ch.M0, can be vibrated by the vibration sources using the vibration signals output from the channels Ch.1 to Ch.M0 by the traveling wave vibration power supply 120.

[0047] Since the number of channels required by the traveling wave excitation power supply 120 can be reduced relative to the number of blades of the blisk 20 to be tested, it is possible to reduce the power consumed by the traveling wave excitation power supply 120 to input vibration signals to all of the vibration sources corresponding to all of the blades 23. Reducing the power consumption of the traveling wave excitation power supply 120 makes it possible to conserve resources used for power generation and reduce greenhouse gas emissions, thereby contributing to the realization of the Sustainable Development Goals (SDGs).

[0048] In the above embodiment, the number of blades is an even number, and a pair of vibration sources is connected to one channel Ch.1 to Ch.M0 of the traveling wave vibration power supply 120. As will be described below, the number of vibration sources connected to one channel Ch.1 to Ch.M0 can be three or more, an even number or an odd number, as long as certain conditions are met. Furthermore, the number of blades is not limited to an even number, and can be an odd number as long as certain conditions are met.

[0049] Three or more excitation sources can be connected to each of the channels Ch.1 to Ch.M0 when the relationship between the number of nodal diameters Nd, the number of blades N0 of the blisk 20, and the number of excitation sources connected J0 to each of the channels Ch.1 to Ch.M0 of the traveling wave excitation power supply 120 satisfies the conditions N0 = n × J0 (where coefficient n is a natural number) and 2Nd = m × J0 (where coefficient m is an integer). This condition is satisfied by the combinations of the number of nodal diameters Nd and the number of excitation sources connected J0 shown in the bold frame in Fig. 8.

[0050] For example, when the number of nodal diameters Nd generated in the blisk 20 is Nd=4, four or eight vibration sources can be connected to one channel Ch.1 to Ch.M0 by four or eight switch sections 131 to 13M0 of the switching unit 130. When the number of nodal diameters Nd=4, as shown in Fig. 4A, the phases of the vibration responses of a pair of blades 23 that are 180° apart in position on the blisk 20 coincide at positions 45° apart in the rotation direction R of the blisk 20.

[0051] 0° and R in the direction of rotation of the blisk 20 and 9 0 ゜ In this position, the vibration response of a pair of blades 23 at 180° different positions of the blisk 20 is The answers are in phase 45° and 45° in the direction of rotation R of the blisk 20 and 1 35 ° In this position, the vibration response of a pair of blades 23 at 180° different positions of the blisk 20 is The answers are in phase .

[0052] When four excitation sources corresponding to four blades 23 of the blisk 20 at a 90° period are connected to one channel Ch.1 to Ch.M0, the coefficient m is an even number (2.0) as shown in FIG. 8. The switching unit 130 、90゜ Different position Each wing Corresponding to 23 Add The four switch sections 131 to 13M0 are switched so that excitation signals of the same phase are input to the vibration sources.

[0053] When eight excitation sources corresponding to eight blades 23 of the blisk 20 at a 45° interval are connected to one channel Ch.1 to Ch.M0, the coefficient m is an odd number (1.0) as shown in FIG. 8. The switching unit 130 、45゜ Different position Each wing Corresponding to 23 Add In-phase excitation signals and anti-phase excitation signals are alternately input to the vibration sources in the arrangement order in the rotation direction R of the blades 23 corresponding to the vibration sources.

[0054] In-phase excitation signals are input to a pair of excitation sources corresponding to the blades 23 at positions 0° and 180° in the order of arrangement in the rotation direction R of the blisk 20. Opposite-phase excitation signals are input to a pair of excitation sources corresponding to the blades 23 at positions 45° and 225°. In-phase excitation signals are input to a pair of excitation sources corresponding to the blades 23 at positions 90° and 270°. Opposite-phase excitation signals are input to a pair of excitation sources corresponding to the blades 23 at positions 135° and 315°.

[0055] The switching unit 130 switches the four switch sections 131 to 13M0 in accordance with the excitation signals to be input to the corresponding excitation sources, and alternately inverts the phase between excitation signals of the same phase and excitation signals of the opposite phase.

[0056] Even when the nodal diameter number Nd is other than 4, for example, when the nodal diameter number Nd=7, seven vibration sources can be connected to one channel of the traveling wave excitation power supply 120 by seven switch units 131 to 13M0. In this case, as shown in FIG. 6C , the phases of the vibration responses of the multiple blades 23 of the blisk 20 coincide at positions corresponding to one-seventh of a 360° cycle in the rotation direction R of the blisk 20. Therefore, the seven vibration sources are disposed for each of the multiple blades 23 of the blisk 20, which are positioned at seven equal circumferential positions. When seven vibration sources are connected to one channel Ch.1 to Ch.M0, the coefficient m is an even number (2.0), as shown in FIG. 8. The switching unit 130 switches the seven switch units 131 to 13M0 so that vibration signals of the same phase are input to the vibration sources corresponding to the blades 23 that are positioned at different one-seventh of a 360° cycle in the rotation direction R of the blisk 20.

[0057] As described above, when multiple vibration sources are connected to one channel Ch.1 to Ch.M0, the vibration sources are arranged around the periphery of the blade 23 at positions equal to the number of the multiple vibration sources connected to one channel Ch.1 to Ch.M0. For example, when three vibration sources are connected to one channel Ch.1 to Ch.M0, the vibration sources are arranged at equal intervals of three around the periphery of the blade 23, and when four vibration sources are connected to one channel Ch.1 to Ch.M0, the vibration sources are arranged at equal intervals of four around the periphery of the blade 23. In particular, when an even number of vibration sources are connected to one channel Ch.1 to Ch.M0, multiple pairs of vibration sources are created that are 180° apart. Furthermore, if the coefficient m is an even number, the vibration signal output from one channel Ch.1 to Ch.M0 is input to the multiple vibration sources connected to one channel Ch.1 to Ch.M0 in the same phase as when it was output from that channel Ch.1 to Ch.M0. On the other hand, if the coefficient m is an odd number, the vibration signal output from one channel Ch.1 to Ch.M0 is input to multiple vibration sources connected to one channel Ch.1 to Ch.M0, with the phase alternately inverted between the same phase as when output from one channel Ch.1 to Ch.M0 and the opposite phase, in the order of arrangement in the rotation direction of the multiple blades 23 corresponding to the multiple vibration sources.

[0058] Even if the number of excitation sources connected to one channel Ch.1 to Ch.M0 is increased, the excitation signals output from the channels Ch.1 to Ch.M0 can excite all of the blades 23 of the blisk 20, which number is greater than the number of channels Ch.1 to Ch.M0. Increasing the number of excitation sources connected to one channel Ch.1 to Ch.M0 can further reduce the power consumption of the traveling wave excitation power supply 120.

[0059] The present disclosure can be widely used when conducting vibration response tests on rotor blades, not limited to blisks.

[0060] Although several embodiments have been described above, the embodiments can be modified or varied based on the above disclosure. All components of the above embodiments and all features described in the claims may be individually extracted and combined, unless they contradict each other.

[0061] The entire contents of Patent Application No. 2022-058812 (filing date: March 31, 2022) are incorporated herein by reference. [Explanation of symbols]

[0062] 10 Vibration response test equipment (traveling wave excitation equipment) 20 Blisk (moving blade) 21 discs 23 Wings 120 Traveling wave excitation power supply (signal source) 130 Switching unit (connection unit) 141,142,14M0,14M0+1,14M0+2,14N0 Excitation source J0 Number of excitation sources connected to one channel (number of excitation sources connected to each channel of the signal source) Nd nodal diameter number N0 Number of blades in the rotor blade R Rotation direction

Claims

1. a plurality of excitation sources that correspond one-to-one to a plurality of blades of the rotor blades and excite the corresponding blades with phases corresponding to input excitation signals; a signal source that outputs the excitation signals of traveling waves, each of which has a different phase for each channel, from a plurality of channels; a connection unit for connecting a pair of excitation sources among the plurality of excitation sources corresponding to a pair of blades among the plurality of blades that are positioned 180° apart in the rotation direction of the rotor blade to the same channel of the signal source; Equipped with The connection unit comprises: When the number of nodal diameters of vibration generated in the rotor blade by excitation of the plurality of blades is even, the excitation signal output from one channel of the plurality of channels is input in the same phase to the pair of excitation sources connected to the one channel, When the number of nodal diameters is odd, the excitation signal output from the one channel is input in opposite phase to the pair of excitation sources connected to the one channel. Traveling wave exciter.

2. The connection unit comprises: connecting a plurality of excitation sources among the plurality of excitation sources to the respective channels of the signal source; The relationship between the number of nodal diameters Nd, the number of blades N0 of the rotor blade, and the number J0 of the plurality of excitation sources connected to each channel of the signal source is as follows: N0 = n x J0 (where the coefficient n is a natural number), and 2Nd = m × J0 (where the coefficient m is an integer) In this case, if the coefficient m is an even number, the vibration signal output from the one channel is input to the plurality of vibration sources connected to the one channel with the same phase as when it was output from the one channel, and if the coefficient m is an odd number, the vibration signal output from the one channel is input to the plurality of vibration sources connected to the one channel with the phase alternately inverted between the same phase as when it was output from the one channel and a phase opposite to that when it was output from the one channel, in the arrangement order in the rotation direction of a plurality of blades among the plurality of blades corresponding to the plurality of vibration sources. The traveling wave excitation device according to claim 1 .

3. The rotor blade is a blisk in which the blades are integrally formed with a disk. The traveling wave excitation device according to claim 1 or 2.

4. A traveling wave excitation method, comprising: When a plurality of blades of a rotor blade are excited by a plurality of excitation sources corresponding one-to-one to the plurality of blades with phases corresponding to excitation signals input to the plurality of excitation sources, When the number of nodal diameters of vibrations generated in the rotor blades by excitation of the plurality of blades is an even number, the same excitation signal is input in the same phase to a pair of excitation sources among the plurality of vibration sources corresponding to a pair of blades that are 180° apart in the rotation direction of the rotor blades, and when the number of nodal diameters is an odd number, the same excitation signal is input in opposite phases to the pair of excitation sources. A traveling wave excitation method comprising:

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