Vibration monitoring device, supercharger, and vibration monitoring method

Abstract

A vibration monitoring device includes a rotation sensor that outputs a rotation signal in synchronization with rotation of a rotating shaft, an output device that outputs a filter command value corresponding to a rotational speed of the rotating shaft calculated from the rotation signal, and at least one filter that extracts, from the rotation signal, a signal in a passband set in accordance with the filter command value as a vibration signal from which vibration information of the rotating shaft can be obtained, by being input with the rotation signal and the filter command value.

Description

Technical Field

[0001] This invention relates to a vibration monitoring device, a booster, and a vibration monitoring method.

[0002] This application claims priority to Japan Patent Application No. 2021-035140, filed with the Japan Patent Office on March 5, 2021, the contents of which are incorporated herein by reference. Additionally, this application claims priority to Japan Patent Application No. 2021-117896, filed with the Japan Patent Office on July 16, 2021, the contents of which are incorporated herein by reference. Background Technology

[0003] For example, Patent Document 1 discloses a technique that outputs a rotation signal synchronized with the rotation of a compressor impeller (rotating body), and calculates the vibration of the rotating body based on the change in the peak value of the output rotation signal of the rotating body.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-224847

[0007] The technical problem that the invention aims to solve

[0008] However, there is a need to monitor the vibration of a rotating shaft without installing a vibration sensor that can directly detect the vibration of the rotating shaft. However, a method for obtaining information related to the vibration of the rotating shaft from the rotation signal of the rotating shaft has not yet been established. Summary of the Invention

[0009] The present invention was made in view of the above-mentioned technical problems, and its object is to provide a vibration monitoring device and vibration monitoring method that can evaluate the vibration of a rotating shaft based on the rotation signal of the rotating shaft.

[0010] Technical means for solving technical problems

[0011] To achieve the above objectives, the vibration monitoring device of the present invention comprises:

[0012] A rotation sensor that outputs a rotation signal synchronized with the rotation of the rotating shaft;

[0013] An output device that outputs a filter command value corresponding to the rotational speed of the rotating shaft calculated based on the rotation signal; and

[0014] At least one filter, which extracts a signal passing through a band field set according to the filter instruction value from the rotation signal by being input with the rotation signal and the filter instruction value, as a vibration signal capable of acquiring vibration information of the rotation shaft.

[0015] To achieve the above objectives, the vibration monitoring method of the present invention comprises:

[0016] The steps for outputting a rotation signal synchronized with the rotation of the rotating axis;

[0017] The steps of outputting a filter command value corresponding to the rotational speed of the rotating shaft calculated based on the rotation signal; and

[0018] The step of extracting a signal passing through a band field, set according to the filter instruction value, from the rotation signal by inputting the rotation signal and the filter instruction value, as a vibration signal capable of acquiring vibration information of the rotating shaft.

[0019] The effects of the invention

[0020] According to the vibration monitoring device and vibration monitoring method of the present invention, the vibration of a rotating shaft can be evaluated based on the rotation signal of the rotating shaft. Attached Figure Description

[0021] Figure 1 This is a diagram that schematically illustrates the structure of a booster incorporating the vibration monitoring device described in the first embodiment.

[0022] Figure 2 This is a diagram that roughly illustrates the structure of the marking section according to the first embodiment.

[0023] Figure 3 This is a waveform diagram of the rotation signal output by the rotation sensor according to the first embodiment.

[0024] Figure 4 This is a schematic functional block diagram of the output device according to the first embodiment.

[0025] Figure 5 Yes Figure 3 The waveform of the rotating pulse signal is obtained by frequency division of the rotating signal.

[0026] Figure 6 This is a diagram showing the characteristic table of the first low-pass filter according to the first embodiment.

[0027] Figure 7 This is a waveform diagram of the vibration signal involved in the first embodiment.

[0028] Figure 8 This is a diagram that schematically illustrates the structure of the vibration monitoring device according to the second embodiment.

[0029] Figure 9 This is a flowchart of the vibration monitoring method involved in the present invention.

[0030] Figure 10 This is a diagram that schematically illustrates the structure of the vibration monitoring device according to the third embodiment.

[0031] Figure 11 This is a graph representing the amplitude-frequency response of a bandpass filter.

[0032] Figure 12 It is a waveform diagram showing the waveforms of the vibration signal extracted by the first low-pass filter, the vibration signal extracted by the band-pass filter, and the actual vibration signal generated by the vibration of the rotating shaft.

[0033] Figure 13 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device according to the fourth embodiment.

[0034] Figure 14 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device according to the fifth embodiment.

[0035] Figure 15 This is a diagram illustrating an example of the content displayed on the display unit.

[0036] Figure 16 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device according to the sixth embodiment.

[0037] Figure 17 This is a diagram illustrating an example of the content displayed on the display unit. Detailed Implementation

[0038] The vibration monitoring device, booster, and vibration monitoring method according to embodiments of the present invention will be described below with reference to the accompanying drawings. These embodiments represent one aspect of the present invention and do not limit the present invention; modifications can be made freely within the scope of the technical concept of the present invention.

[0039] <First Implementation Method>

[0040] (Structure of the turbocharger)

[0041] Figure 1 This is a schematic diagram illustrating the structure of a turbocharger 100 that incorporates the vibration monitoring device 1 according to the first embodiment. The turbocharger 100 is not particularly limited; for example, it may be an exhaust turbocharger mounted on a ship for boosting the intake air of an engine. In this invention, such an exhaust turbocharger will be used as an example for explanation.

[0042] like Figure 1 As shown, the turbocharger 100 includes a rotating shaft 102, a compressor 104, a turbine 106, and a vibration monitoring device 1 according to the first embodiment. At one end of the rotating shaft 102 in the axial direction O ( Figure 1A compressor 104 is provided at the left end of the rotating shaft 102. At the other end (in the direction of axis O) of the rotating shaft 102... Figure 1 A turbine 106 is provided at the right end of the compressor 104. A rotating shaft 102 connects the compressor 104 and the turbine 106.

[0043] Compressor 104 compresses intake air and supplies it to an engine (not shown). Turbine 106 converts the energy of exhaust gas from the engine into rotational energy as it passes through. Rotating shaft 102 then rotates together with turbine 106 about axis O. Compressor 104 is driven by the rotation of rotating shaft 102.

[0044] exist Figure 1 In the illustrated embodiment, the rotating shaft 102 includes a marking portion 108 configured to give the rotation signal A (described later) a pulse waveform. The marking portion 108 is disposed between the compressor 104 and the turbine 106 in the axial direction O. The marking portion 108 is located on the turbine 106 side between the compressor 104 and the turbine 106 in the axial direction O. In some embodiments, the marking portion 108 is disposed at one end of the rotating shaft 102 relative to the compressor 104 in the axial direction O.

[0045] An example of the configuration of the marking section 108 will be described. Figure 2 This is a diagram that schematically illustrates the structure of the marking portion 108 according to the first embodiment. Figure 2 In the illustrated configuration, the rotating shaft 102 includes an inner rotating body 110 and an outer rotating body 112. The inner rotating body 110 of the rotating shaft 102 rotates about axis O together with the rotation of the turbine 106. The outer rotating body 112 has a hole 114 for the inner rotating body 110 to be inserted into. In other words, the outer rotating body 112 is mounted on the inner rotating body 110 in such a way that it covers the outer peripheral surface of the inner rotating body 110. The outer rotating body 112 rotates together with the inner rotating body 110 inserted into the hole 114. The outer rotating body 112 includes a groove 118 formed on its outer peripheral surface 116. When the groove 118 is not formed, the outer peripheral surface 116 of the outer rotating body 112 has a circular shape. The groove 118 is formed by cutting from a portion 117 of the circular outer peripheral surface 116 toward axis O. Figure 2 In the illustrated configuration, the outer rotating body 112 includes two grooves 118, and the outer peripheral surface 116 has an elliptical shape. One groove 118 is located on the opposite side of the other groove 118, separated by an axis O. The outer rotating body 112 has two grooves 118 that are symmetrical about the axis O. Such an outer rotating body 112 corresponds to the marking portion 108.

[0046] Furthermore, the marking unit 108 is not limited to any particular configuration, as long as it is configured to give the rotation signal A a pulse waveform. Figure 2The illustrated manner. For example, the marking portion 108 (outer rotating body 112) may also include a protrusion that projects radially outward from a portion 117 of the outer peripheral surface 116 instead of the groove 118.

[0047] (Structure of the vibration monitoring device according to the first embodiment)

[0048] like Figure 1 As shown, the vibration monitoring device 1 includes a rotation sensor 2, an output device 4, and a first low-pass filter 6. The output device 4 and the first low-pass filter 6 are electrically connected to the rotation sensor 2, respectively, and are able to acquire the output value (rotation signal A) of the rotation sensor 2. The first low-pass filter 6 is electrically connected to the output device 4, and is able to acquire the output value (filter command value D) of the output device 4.

[0049] Rotation sensor 2 outputs a rotation signal A synchronized with the rotation of rotation shaft 102. Rotation sensor 2 is an eddy current displacement sensor that detects a distance d from the outer peripheral surface 116 of rotation shaft 102 by generating eddy currents in the outer peripheral surface 116. More specifically, rotation sensor 2 is composed of a coil that generates high-frequency magnetic flux. The change in eddy current generated on the outer peripheral surface 116 of rotation shaft 102 (the target object) is detected by the high-frequency magnetic flux generated from the coil, and the change in coil impedance is used as the change in the coil's impedance. That is, rotation sensor 2 detects the change in coil impedance as a result of the change in distance d accompanying the rotation of rotation shaft 102, achieving a structure that yields maximum output when the outer peripheral surface 116 of rotation shaft 102 is closest to rotation sensor 2.

[0050] Furthermore, the rotation sensor 2 is not limited to an eddy current displacement sensor. In some embodiments, the rotation sensor 2 is a laser displacement sensor, which has a laser head that irradiates a laser beam onto the outer peripheral surface 116 of the rotation shaft 102, and detects the distance from the laser head to the outer peripheral surface 116 of the rotation shaft 102 by means of the reflected light of the laser beam.

[0051] Figure 3 This is a waveform diagram of the rotation signal A output by the rotation sensor 2 according to the first embodiment. For example... Figure 3As shown, since the marking portion 108 (outer rotating body 112) of the aforementioned rotating shaft 102 includes a groove 118, the rotation signal A has a pulse waveform that accompanies the rotation of the rotating shaft 102. That is, during the rotation of the rotating shaft 102, the displacement changes significantly when the rotating sensor 2 and the groove 118 are opposite each other. On the other hand, during the rotation of the rotating shaft 102, the displacement change is smaller when the rotating sensor 2 and the groove 118 are not opposite each other. In the first embodiment, since the marking portion 108 has two grooves 118, two pulses (the portion 120 where the waveform displacement changes significantly) occur during one revolution of the rotating shaft 102.

[0052] Output device 4 outputs a filter command value D corresponding to the rotational speed C of the rotating shaft 102 calculated based on the rotation signal A. This output device 4 is a computer such as an electronic control device, equipped with a processor (not shown) such as a CPU or GPU; memory such as ROM or RAM; and I / O interfaces. The output device 4 performs actions (calculations, etc.) according to commands from a program loaded in memory, thereby realizing the various functional units possessed by the output device 4. (Refer to...) Figure 4 The functional parts of the output device 4 in the first embodiment will be described.

[0053] Figure 4 This is a schematic functional block diagram of the output device 4 according to the first embodiment. Figure 4 As shown, the output device 4 includes a frequency divider 122, a counter 124, a display 126, and a filter command value output 8.

[0054] Figure 5 Yes Figure 3 The waveform of the rotational pulse signal B, which is a frequency-divided rotational signal A, is shown below. Figure 5 As shown, the frequency divider 122 divides the rotation signal A output by the rotation sensor 2 and converts it into a rotation pulse signal B that contains one pulse (the part 130 where the waveform displacement changes significantly) in one rotation of the rotation shaft 102.

[0055] The counting unit 124 counts the number of pulses contained in the rotation pulse signal B per unit time and calculates the rotational speed C of the rotating shaft 102. The display unit 126 displays the rotational speed C of the rotating shaft 102 calculated by the counting unit 124 on a display device such as a monitor. Furthermore, the display device may be included in the output device 4 or may be separate from the output device 4.

[0056] The filter command value output unit 8 outputs a filter command value D corresponding to the rotational speed C of the rotating shaft 102 calculated by the counting unit 124. In the first embodiment, the filter command value D is a voltage value obtained by converting the rotational speed C of the rotating shaft 102 using a preset conversion method. This conversion method is set based on the characteristics of the first low-pass filter 6, which will be described later. In the first embodiment, when the rotational speed C of the rotating shaft 102 increases, the filter command value D (voltage value) also increases. In some embodiments, the rotational speed C of the rotating shaft 102 and the filter command value D are proportional to each other. In some embodiments, the filter command value D is a current value obtained by converting the rotational speed C of the rotating shaft 102 using a preset conversion method.

[0057] like Figure 1 As shown, the first low-pass filter 6 outputs (extracts) a vibration signal E by taking the input rotation signal A and the filter command value D. This vibration signal E is a signal that can acquire vibration information of the rotating shaft 102. The vibration information includes, for example, the vibration frequency, the magnitude of the vibration, or the speed of the vibration.

[0058] The first low-pass filter 6 is configured to set a first cutoff frequency P1 according to the filter command value D (voltage value). The first low-pass filter 6 allows rotational signals A from the rotational signal A output by the rotation sensor 2 that are lower than the first cutoff frequency P1 to pass through, while blocking rotational signals A that are higher than the first cutoff frequency P1. The first low-pass filter 6 extracts the rotational signals A that are lower than the first cutoff frequency P1 as the vibration signal E. Thus, the first low-pass filter 6 sets the passband (frequency band lower than the first cutoff frequency P1) of the signal according to the filter command value D, and extracts the signal from the rotational signal A within the passband set according to the filter command value D as the vibration signal E.

[0059] Here, the setting of the first cutoff frequency P1 will be explained. Figure 6 This is a diagram showing the characteristic table of the first low-pass filter 6 according to the first embodiment. Figure 6 In the diagram, the horizontal axis represents frequency on a logarithmic scale, and the vertical axis represents decibel values. Figure 6 In the diagram, V1 represents the characteristics of the first low-pass filter 6 when the voltage value (filter command value D) is 0.01V, V2 represents the characteristics of the first low-pass filter 6 when the voltage value is 0.1V, V3 represents the characteristics of the first low-pass filter 6 when the voltage value is 1V, and V4 represents the characteristics of the first low-pass filter 6 when the voltage value is 10V.

[0060] The decibel value is equivalent to the signal strength. When the decibel value is less than 0, the vibration signal E extracted by the first low-pass filter 6 is attenuated. For example... Figure 6As shown, among the voltage values ​​(V1 to V4), the higher the frequency, the lower the decibel value, and the greater the attenuation rate of the vibration signal E. More specifically, when the voltage value input to the first low-pass filter 6 is 0.1V ( Figure 6 The first low-pass filter 6 (V2) cuts off the rotation signal A above 1kHz from the rotation signal A input to the first low-pass filter 6, thereby extracting the vibration signal E. In the first embodiment, the first low-pass filter 6 sets the first cutoff frequency P1 to 0 dB. For example, the first low-pass filter 6 sets the first cutoff frequency to 1kHz when the voltage value is 0.1V.

[0061] (The function / effect of the vibration monitoring device involved in the first embodiment)

[0062] According to the present invention, such as Figure 7 As shown, when a rotational signal A (vibration signal E) smaller than the first cutoff frequency P1 is extracted from the rotational signal A of the rotating shaft 102, the waveform is similar to that of the actual vibration signal Z generated by the vibration of the rotating shaft 102. Furthermore, the inventors have discovered that by setting the first cutoff frequency P1 according to the rotational speed C of the rotating shaft 102, the vibration signal E can be extracted from the rotational signal A with high precision.

[0063] According to the first embodiment, such as Figure 1 As shown, the first low-pass filter 6 extracts the rotation signal A of the rotating shaft 102, which is smaller than the first cutoff frequency P1 set according to the filter command value D, as the vibration signal E by taking the input rotation signal A of the rotating shaft 102 and the filter command value D. Therefore, the vibration of the rotating shaft 102 can be evaluated based on the rotation signal A of the rotating shaft 102. In addition, the vibration of the rotating shaft 102 can be monitored without providing a vibration sensor that directly detects the vibration of the rotating shaft 102.

[0064] Furthermore, although not illustrated, in some embodiments, the vibration monitoring device 1 also includes a vibration notification device that acquires vibration information (vibration frequency, vibration magnitude, vibration speed, etc.) from the vibration signal E extracted by the first low-pass filter 6 and notifies the user of this vibration information. Such a vibration notification device can be, for example, a monitor that displays vibration information, or a warning device that generates a warning sound or a warning light when the vibration information acquired from the vibration signal E exceeds a preset threshold.

[0065] According to the first embodiment, since the filter command value D corresponds to the rotational speed C of the rotating shaft 102, the first cutoff frequency P1 is set according to the rotational speed C of the rotating shaft 102. Specifically, when the rotational speed C of the rotating shaft 102 increases, the first cutoff frequency P1 also increases. In this way, since the first cutoff frequency P1 is set to follow the rotational speed C of the rotating shaft 102, the vibration signal E can be extracted from the rotational signal A with high precision.

[0066] In most cases, the first low-pass filter 6 can be set to a first cutoff frequency P1 based on the voltage value. According to the first embodiment, since the filter command value D is a voltage value, the first cutoff frequency P1 can be arbitrarily set according to the rotational speed C of the rotating shaft 102. In addition, since such a first low-pass filter 6 is generally inexpensive, it is possible to suppress the increase in the installation cost of the vibration monitoring device 1.

[0067] According to the first embodiment, since the rotating shaft 102 includes a marking portion 108, the rotating sensor 2 can output a high-precision rotating signal A compared to the case where the rotating signal A is output from the rotating shaft 102 that does not include the marking portion 108.

[0068] According to the first embodiment, the rotation sensor 2 can be an eddy current sensor. Furthermore, according to the first embodiment, since two grooves 118 are formed on the outer peripheral surface 116 of the rotating shaft 102, the rotation sensor 2 outputs a rotation signal A with two pulses during one revolution of the rotating shaft 102. If only one groove 118 is formed in the axial cross-sectional view of the rotating shaft 102, the high-speed rotating body such as the rotating shaft 102 of the turbocharger 100 will have an unbalanced shape, which may contribute to increased vibration of the rotating shaft 102. In contrast, as illustrated in the first embodiment, by forming two grooves 118 on the outer peripheral surface 116 of the rotating shaft 102, an unbalanced shape of the rotating shaft 102 can be suppressed. Moreover, in some embodiments, forming only one groove 118 on the outer peripheral surface 116 of the rotating shaft 102 reduces the impact of imbalance caused by only forming one groove 118 when the turbine 106 and compressor 104 are mounted on the rotating shaft 102. In this case, the output device 4 may also not include the frequency divider 122.

[0069] During the operation of the turbocharger 100, the rotational speed C of the rotating shaft 102 of the turbocharger 100 varies considerably. According to the first embodiment, the first low-pass filter 6 of the vibration monitoring device 1 sets a first cutoff frequency P1 based on the rotational speed C of the rotating shaft 102. Therefore, by providing the vibration monitoring device 1 to the turbocharger 100, a turbocharger 100 capable of evaluating the vibration of the rotating shaft 102 of the turbocharger 100 based on the rotational signal A of the rotating shaft 102 of the turbocharger 100 can be provided. Furthermore, since the rotational speed C of the rotating shaft 102 of a marine exhaust turbocharger is particularly prone to variation, the application of the vibration monitoring device 1 according to the present invention in an exhaust turbocharger is highly effective.

[0070] <Second Implementation Method>

[0071] The vibration monitoring device 1 according to the second embodiment of the present invention will be described. The second embodiment differs from the first embodiment in that it further includes a second low-pass filter 10, but otherwise the structure is the same as that described in the first embodiment. In the second embodiment, the same reference numerals are used for structures with the same constituent elements as those in the first embodiment, and detailed descriptions are omitted.

[0072] (Structure of the vibration monitoring device according to the second embodiment)

[0073] Figure 8 This is a diagram that schematically illustrates the structure of the vibration monitoring device 1 according to the second embodiment. (See diagram for example.) Figure 8 As shown, the vibration monitoring device 1 also includes a second low-pass filter 10.

[0074] exist Figure 8 In the illustrated configuration, the second low-pass filter 10 is electrically connected to the first low-pass filter 6 and is input with the vibration signal E extracted from the first low-pass filter 6. The second low-pass filter 10 outputs (extracts) a levitation signal F based on the input vibration signal E. This levitation signal F is a signal capable of acquiring levitation information of the rotation shaft 102. The levitation information is, for example, the difference (levitation amount) between the vertical position of the rotation shaft 102 when it is not rotating and its vertical position when it is rotating.

[0075] The second low-pass filter 10 has a second cutoff frequency P2 that is smaller than the first cutoff frequency P1. This second cutoff frequency P2 can also be a fixed value. In some embodiments, the second cutoff frequency P2 is less than 10Hz. By making the second cutoff frequency P2 less than 10Hz, the effects of the rotational synchronization vibration of the rotating shaft 102 and interference from other devices can be eliminated.

[0076] The second low-pass filter 10 allows vibration signals E smaller than the second cutoff frequency P2 to pass through, while blocking vibration signals E above the second cutoff frequency P2. The second low-pass filter 10 extracts vibration signals E smaller than the second cutoff frequency P2 as the buoyancy signal F. Thus, the passband (frequency band smaller than the second cutoff frequency P2) of the signal in the second low-pass filter 10 is set according to the filter command value D. The second low-pass filter 10 extracts the signal from the rotation signal A within the passband set according to the filter command value D as the buoyancy signal F.

[0077] (The function / effect of the vibration monitoring device involved in the second embodiment)

[0078] The inventors have discovered that when a vibration signal E smaller than the second cutoff frequency P2 is extracted from the vibration signal E, a DC component signal is extracted, which corresponds to the levitation signal F. According to the second embodiment, the second low-pass filter 10 extracts the vibration signal E smaller than the second cutoff frequency P2 as the levitation signal F from the input vibration signal E. Therefore, the levitation of the rotating shaft 102 can be evaluated based on the rotation signal A of the rotating shaft 102.

[0079] Furthermore, in the second embodiment, the second low-pass filter 10 is configured to receive the input vibration signal E, but the present invention is not limited to this method. In some embodiments, the second low-pass filter 10 is electrically connected to the rotation sensor 2 and receives the rotation signal A output from the rotation sensor 2. Then, the second low-pass filter 10 outputs (extracts) the buoyancy signal F through the input rotation signal A. Although not illustrated, in some embodiments, the vibration monitoring device 1 also includes a buoyancy amount notification device that obtains buoyancy information from the buoyancy signal F and notifies the user of the buoyancy information.

[0080] (Vibration monitoring method)

[0081] Figure 9 This is a flowchart of the vibration monitoring method involved in this invention. Figure 9 As shown, the vibration monitoring method includes a rotation signal output step S2, a filter command value output step S4, and an extraction step S6.

[0082] The contents described in the above embodiments are as follows.

[0083] In the rotation signal output step S2, a rotation signal A synchronized with the rotation of the rotation shaft 102 is output. In the filter command value output step S4, a filter command value D corresponding to the rotational speed C of the rotation shaft 102 calculated based on the rotation signal A is output. In the extraction step S6, the rotation signal A, which is smaller than the first cutoff frequency P1 set according to the filter command value D, is extracted as a vibration signal E capable of acquiring vibration information of the rotation shaft 102 by using the input rotation signal A and the filter command value D. According to this vibration monitoring method, the vibration of the rotation shaft 102 can be evaluated based on the rotation signal A of the rotation shaft 102.

[0084] <Third Implementation Method>

[0085] The vibration monitoring device 1 according to the third embodiment of the present invention will be described. In the vibration monitoring device 1 according to the third embodiment, unless otherwise specified, the symbols that are common to the various structures of the vibration monitoring device 1 according to the first embodiment represent the same structures as those of the vibration monitoring device 1 according to the first embodiment, and the description is omitted.

[0086] (Structure of the vibration monitoring device according to the third embodiment)

[0087] Figure 10 This is a diagram that schematically illustrates the structure of the vibration monitoring device 1 according to the third embodiment. Figure 10 As shown, the vibration monitoring device 1, in addition to the structure described in the first embodiment, also includes a bandpass filter 20.

[0088] By inputting the rotation signal A output by the rotation sensor 2 and the filter command value D output by the output device 4 into the bandpass filter 20, the bandpass filter 20 extracts the signal G that passes through the band range set according to the filter command value D from the rotation signal A as a vibration signal G capable of acquiring vibration information of the rotating shaft, and outputs the vibration signal G. This vibration information includes, for example, the vibration frequency, vibration magnitude (amplitude), or vibration velocity of the vibration signal G. Furthermore, in Figure 10 In the example shown, the filter command value D is input from the output device 4 to the bandpass filter 20 via the first low-pass filter 6, but the filter command value D can also be input from the output device 4 to the bandpass filter 20 without passing through the first low-pass filter 6.

[0089] Figure 11 This is a graph representing the amplitude-frequency response of bandpass filter 20. Figure 11 In the diagram, the horizontal axis represents frequency on a logarithmic scale, and the vertical axis represents decibel values. Figure 11In the diagram, V5 represents the characteristics of the bandpass filter 20 when the voltage value (filter command value D) is 0.1V, V6 represents the characteristics of the bandpass filter 20 when the voltage value is 1V, and V7 represents the characteristics of the bandpass filter 20 when the voltage value is 10V.

[0090] exist Figure 11 In this context, the decibel value corresponds to the signal strength. When the decibel value is less than 0, the vibration signal E extracted by the bandpass filter 20 is attenuated. For example... Figure 11 As shown, in each voltage value (V5 to V7), the decibel value decreases as the frequency moves away from the center frequency Fc of the passband of the bandpass filter 20, and the attenuation rate of the vibration signal G increases. This center frequency Fc is set according to the filter command value D (corresponding to the rotational speed C) output by the output device 4. Specifically, this center frequency Fc is set to be the same as the value output by the counting unit 124 of the output device 4 (see reference 124). Figure 4 The rotational speed C of the rotating shaft 102 is consistent with or approximately consistent with the rotational speed C of the counting shaft. For example, the bandpass filter 20 can also attenuate the vibration signal G in a manner that satisfies 0.8C ≤ Fc ≤ 1.2C, based on the filter command value D. Furthermore, when the rotational speed C of the rotating shaft 102 is proportional to the filter command value D, the center frequency Fc can also be set in a manner that makes the filter command value D proportional to the center frequency Fc. Additionally, the upper and lower limits of the passband of the bandpass filter 20 are set on either side of the center frequency Fc based on the filter command value D.

[0091] (The function / effect of the vibration monitoring device involved in the third embodiment)

[0092] Figure 12 This is a waveform diagram showing the vibration signal E extracted by the first low-pass filter 6, the vibration signal G extracted by the band-pass filter 20, and the actual vibration signal Z generated by the vibration of the rotating shaft 102. As described above, in the third embodiment, the center frequency Fc of the bandpass filter 20 is set to be the same as or approximately the same as the rotational speed C of the rotating shaft 102 (for example, satisfying 0.8C ≤ Fc ≤ 1.2C). Therefore, as... Figure 12 As shown, the vibration signal G extracted by the bandpass filter 20 has a similar waveform to the actual vibration signal Z generated by the vibration of the rotating shaft 102. Based on the vibration signal G, vibrations synchronized with the rotation of the rotating shaft 102 (vibrations with a vibration frequency at one times the rotational speed C) can be evaluated with high precision. Therefore, it is possible to evaluate and determine rotor imbalances of the turbocharger 100 (e.g., imbalances caused by scale buildup), rotor bending, rotor contact with the chassis, etc., enabling the formulation of optimal maintenance proposals for the turbocharger 100 and the prevention of malfunctions.

[0093] Furthermore, although not illustrated, in the third embodiment, the vibration monitoring device 1 also includes a vibration notification device. This device acquires vibration information (vibration frequency, vibration magnitude, vibration velocity, etc.) from the vibration signal E extracted by the first low-pass filter 6 and the vibration signal G extracted by the band-pass filter 20, respectively, and notifies the user of this vibration information. Such a vibration notification device could be, for example, a monitor that displays vibration information, or a warning device that generates a warning sound or a warning light when the vibration information acquired from the vibration signal E exceeds a preset threshold.

[0094] <Fourth Implementation Method>

[0095] The vibration monitoring device 1 according to the fourth embodiment of the present invention will be described. In the vibration monitoring device 1 according to the fourth embodiment, unless otherwise specified, the symbols that are common to the various structures of the vibration monitoring device 1 according to the third embodiment represent the same structures as those of the vibration monitoring device 1 according to the third embodiment, and the description is omitted.

[0096] (Structure of the vibration monitoring device according to the fourth embodiment)

[0097] Figure 13 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device 1 according to the fourth embodiment. (See diagram for example.) Figure 13 As shown, the vibration monitoring device 1, in addition to the structure described in the third embodiment, also includes a vector monitor 30 (display device).

[0098] The output signal of the rotation sensor 2 (in the illustrated example, the rotation pulse signal B, which is the output of the frequency divider 122) and the vibration signal G extracted by the bandpass filter 20 are input to the vector monitor 30. The vector monitor 30 includes a detection unit 32 and a display unit 34. The detection unit 32 detects the amplitude and phase angle of the vibration signal G (e.g., the phase angle based on the pulse 130 of the rotation pulse signal B) based on the input signals (rotation pulse signal B and vibration signal G), and the display unit 34 displays the amplitude and phase angle of the vibration signal G detected by the detection unit 32.

[0099] (Function / Effect of the vibration monitoring device involved in the fourth embodiment)

[0100] By detecting the amplitude and phase of the vibration synchronized with the rotation of the rotating shaft 102 (vibration with a vibration frequency at one times the rotational speed C) and displaying it on the display unit 34, the vibration synchronized with the rotation of the rotating shaft 102 can be evaluated with high precision, and the determination of, for example, the dangerous speed of the shaft system of the turbocharger 100, contact events, and the aforementioned imbalance can be performed with high precision.

[0101] <Fifth Implementation Method>

[0102] The vibration monitoring device 1 according to the fifth embodiment of the present invention will be described. In the vibration monitoring device 1 according to the fifth embodiment, unless otherwise specified, the symbols that are common to the various structures of the vibration monitoring device 1 according to the third embodiment represent the same structures as those of the vibration monitoring device 1 according to the third embodiment, and the description is omitted.

[0103] (Structure of the vibration monitoring device according to the fifth embodiment)

[0104] Figure 14 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device 1 according to the fifth embodiment. In addition to the structure described in the third embodiment, the vibration monitoring device 1 according to the fifth embodiment also includes a MEMS sensor 40 (MEMS: Micro ElectroMechanical Systems) for detecting vibrations of an engine (not shown) connected to the turbocharger 100. The MEMS sensor 40 is an acceleration sensor for detecting engine vibrations.

[0105] The vibration monitoring device 1 according to the fifth embodiment has a housing 42 (junction box) that houses the rotation sensor 2. The MEMS sensor 40 and the rotation sensor 2 are disposed together inside the housing 42. The housing 42 is disposed, for example, between the turbocharger 100 and the engine. When the turbocharger 100 is mounted on the engine, the housing 42 is disposed at the lower part of the turbocharger 100.

[0106] In addition, the vibration monitoring device 1 includes a display unit 44, which is configured to simultaneously display the following information: vibration information of the engine obtained from the output of the MEMS sensor 40; vibration information of the rotating shaft 102 obtained from the vibration signal E extracted by the first low-pass filter 6; and vibration information of the rotating shaft 102 obtained from the vibration signal G extracted by the band-pass filter 20. This vibration information includes, for example, vibration frequency, vibration magnitude (amplitude), or vibration velocity.

[0107] Figure 15 This is a diagram showing an example of the content displayed by display unit 44. Figure 15In the example shown, display unit 44 displays the amplitude of the engine vibration as engine vibration information acquired from the output of MEMS sensor 40. Additionally, display unit 44 displays the amplitude (total amplitude) of vibration signal E as vibration information of the rotating shaft 102 acquired from vibration signal E extracted by the first low-pass filter 6. Furthermore, display unit 44 displays the amplitude of vibration signal G (rotational amplitude: amplitude of vibration with a vibration frequency having one time the rotational speed C) as vibration information of the rotating shaft 102 acquired from vibration signal G extracted by band-pass filter 20.

[0108] (Function / Effect of the vibration monitoring device according to the fifth embodiment)

[0109] Since engine vibration information can be indirectly acquired via MEMS sensor 40, and by simultaneously displaying the engine vibration information and the vibration information of the turbocharger 100's rotating shaft 102 on display unit 44, the vibration of the turbocharger 100's rotating shaft 102 and the engine vibration can be evaluated without confusion. Therefore, the vibration of the turbocharger 100's rotating shaft 102 can be evaluated and determined with high precision. Furthermore, MEMS sensor 40 is inexpensive, allowing for inexpensive and high-precision evaluation of the turbocharger 100's rotating shaft 102 without the need for a temporary vibration sensor.

[0110] Furthermore, in some embodiments, a data receiving unit may be provided instead of the display unit 44 or together with the display unit 44. Figure 14 In the example shown, the data acquisition unit is configured to acquire the following information: vibration information of the engine obtained from the output of the MEMS sensor 40; vibration information of the rotating shaft 102 obtained from the vibration signal E extracted by the first low-pass filter 6; and vibration information of the rotating shaft 102 obtained from the vibration signal G extracted by the band-pass filter 20.

[0111] <Sixth Implementation Method>

[0112] The vibration monitoring device 1 according to the sixth embodiment of the present invention will be described. In the vibration monitoring device 1 according to the sixth embodiment, unless otherwise specified, the symbols that are common to the various structures of the vibration monitoring device 1 according to the fifth embodiment represent the same structures as those of the vibration monitoring device 1 according to the fifth embodiment, and the description is omitted.

[0113] (Structure of the vibration monitoring device according to the sixth embodiment)

[0114] Figure 16 This is a diagram that schematically illustrates a portion of the structure of the vibration monitoring device 1 according to the sixth embodiment. (See diagram for example.) Figure 16As shown, the vibration monitoring device 1 according to the sixth embodiment, in addition to the structure according to the fifth embodiment, also includes a bearing temperature sensor 52 and a lubricating oil outlet temperature sensor 54. The bearing temperature sensor 52 detects the vibration of the rotating shaft 102 (see reference 104) in the turbocharger 100. Figure 10 The temperature of the bearing 50, which is supported by a rotatable bearing, is detected by the lubricating oil outlet temperature sensor 54, which detects the temperature of the outlet of the lubricating oil (the lubricating oil supplied to the bearing 50) in the turbocharger 100.

[0115] The display unit 44 in the sixth embodiment simultaneously displays: vibration information of the engine obtained from the output of the MEMS sensor 40; vibration information of the rotating shaft 102 obtained from the vibration signal E extracted by the first low-pass filter 6; vibration information of the rotating shaft 102 obtained from the vibration signal G extracted by the band-pass filter 20; the temperature of the bearing 50 detected by the bearing temperature sensor 52; and the temperature of the lubricating oil at the outlet of the turbocharger 100 detected by the lubricating oil outlet temperature sensor 54.

[0116] Figure 17 This is a diagram showing an example of the content displayed by display unit 44. Figure 17 In the example shown, display unit 44, in addition to Figure 15 In addition to the contents shown, the temperature of bearing 50 (bearing temperature) and the temperature of lubricating oil at the outlet of the turbocharger 100 (lubricating oil outlet temperature) are also displayed.

[0117] (The function / effect of the vibration monitoring device according to the sixth embodiment)

[0118] While achieving the effects described in the fifth embodiment, the condition of the turbocharger 100 can be accurately evaluated based on the temperature of the bearing 50 and the temperature of the outlet of the lubricating oil in the turbocharger 100, thereby improving the evaluation accuracy of the preventive maintenance of the turbocharger 100.

[0119] Furthermore, in some embodiments, a data receiving unit (not shown) may be provided instead of the display unit 44 or together with the display unit 44. Figure 16 In the example shown, the data acquisition unit is configured to acquire the following information: vibration information of the engine based on the output of the MEMS sensor 40; vibration information of the rotating shaft 102 obtained from the vibration signal E extracted by the first low-pass filter 6; vibration information of the rotating shaft 102 obtained from the vibration signal G extracted by the band-pass filter 20; temperature of the bearing 50 detected by the bearing temperature sensor 52; and temperature of the lubricating oil outlet in the turbocharger 100 detected by the lubricating oil outlet temperature sensor 54.

[0120] Furthermore, the present invention is not limited to the embodiments described above, but also includes modifications to the embodiments described above, and appropriate combinations of these embodiments. For example, in the third embodiment described above, although the vibration monitoring device 1 is shown to have a structure including a first low-pass filter 6 and a band-pass filter 20, the vibration monitoring device 1 only needs to have at least one of the first low-pass filter 6, the second low-pass filter 10, and the band-pass filter 20.

[0121] The contents described in the above embodiments are as follows.

[0122] [1] The vibration monitoring device (1) according to the present invention comprises:

[0123] Rotation sensor (2), which outputs a rotation signal (A) synchronized with the rotation of the rotation shaft (102);

[0124] Output device (4), which outputs a filter command value (D) corresponding to the rotational speed (C) of the rotating shaft calculated based on the rotation signal; and

[0125] At least one filter (6, 10, 20) extracts a signal (E or G) through the band field set according to the filter instruction value from the rotation signal by being input to the rotation signal and the filter instruction value as a vibration signal (E or G) capable of acquiring vibration information of the rotation shaft.

[0126] According to the structure described above [1], by appropriately setting the passband of at least one filter according to the rotational speed of the rotating shaft, a passband signal suitable for evaluating the vibration of the rotating shaft can be extracted from the rotation signal synchronized with the rotation of the rotating shaft. Therefore, the vibration of the rotating shaft can be evaluated based on the rotation signal of the rotating shaft.

[0127] [2] In some embodiments, in the structure described in [1] above,

[0128] The at least one filter includes a first low-pass filter (6).

[0129] The first low-pass filter extracts a signal (E) that passes through the band domain and is smaller than the first cutoff frequency (P1) set according to the filter command value as the vibration signal (E) by being input the rotation signal and the filter command value.

[0130] The inventors have discovered that when a rotational signal smaller than the first cutoff frequency is extracted from the rotational signal of the rotating shaft, the waveform is similar to the actual vibration signal generated by the vibration of the rotating shaft. Furthermore, the inventors have discovered that by setting the first cutoff frequency according to the rotational speed of the rotating shaft, the vibration signal can be extracted from the rotational signal with high precision. According to the structure described above [2], the first low-pass filter extracts the rotational signal of the rotating shaft smaller than the first cutoff frequency set according to the filter command value as a vibration signal by using the input rotational signal of the rotating shaft and the filter command value. Therefore, the vibration of the rotating shaft can be evaluated based on the rotational signal of the rotating shaft.

[0131] Furthermore, according to the structure described above [2], since the filter command value is a value corresponding to the rotational speed of the rotating shaft, the first cutoff frequency is set according to the rotational speed of the rotating shaft. That is, since the first cutoff frequency is set to follow the rotational speed, the vibration signal can be extracted from the rotational signal of the rotating shaft with high precision.

[0132] [3] In some embodiments, in the structure described in [2] above,

[0133] The at least one filter further comprises a second low-pass filter (10) having a second cutoff frequency (P2) smaller than the first cutoff frequency.

[0134] According to the structure described above [3], it is possible to extract signals smaller than the second cutoff frequency (e.g., vibration signals smaller than the second cutoff frequency).

[0135] [4] In some embodiments, in the structure described in [3] above,

[0136] The second low-pass filter extracts a signal (E) with a frequency smaller than the second cutoff frequency from the vibration signal extracted by the first low-pass filter as a buoyancy signal (F) capable of acquiring buoyancy information of the rotating shaft.

[0137] The inventors have discovered that when a vibration signal smaller than the second cutoff frequency is extracted from the vibration signal, it is equivalent to a levitation signal that can acquire information about the levitation of the rotating shaft. According to the structure described above [4], the second low-pass filter further removes the vibration signal through the second cutoff frequency and extracts it as a DC signal (levitation signal). Therefore, the levitation of the rotating shaft can be evaluated based on the rotation signal of the rotating shaft.

[0138] [5] In some embodiments, in any of the structures described in [1] to [4] above,

[0139] The at least one filter includes a bandpass filter.

[0140] The bandpass filter extracts a signal (G) containing a center frequency (Fc) set according to the filter command value from the rotation signal as the vibration signal (G).

[0141] According to the structure described above [5], by setting the center frequency of the passband of the bandpass filter to be the same as or approximately the same as the rotational speed of the rotating shaft, it is possible to evaluate vibrations synchronized with the rotation of the rotating shaft (vibrations with a vibration frequency that is one or approximately one times the rotational speed C) with high precision based on the vibration signal extracted by the bandpass filter. As a result, it is possible to evaluate and determine the imbalance of the turbocharger rotor (e.g., imbalance caused by scale buildup), rotor bending, or rotor contact with the cab, and to propose optimal maintenance for the turbocharger and prevent malfunctions in advance.

[0142] [6] In some embodiments, in the structure described in [5] above,

[0143] When the center frequency is set to Fc and the rotational speed of the rotating shaft is set to C, the condition 0.8C≤Fc≤1.2C is satisfied.

[0144] According to the structure described above [6], since the center frequency of the passband of the bandpass filter is set to be the same as or approximately the same as the rotational speed of the rotating shaft (0.8C≤Fc≤1.2C), vibrations synchronized with the rotation of the rotating shaft can be evaluated with high precision based on the vibration signal extracted by the bandpass filter. As a result, it is possible to evaluate and determine the imbalance of the turbocharger rotor, the bending of the rotor, or the contact between the rotor and the cab, and to propose optimal maintenance of the turbocharger and prevent failures in advance.

[0145] [7] In some embodiments, in the structures described in [5] or [6] above,

[0146] It also includes a display unit (34) that displays the amplitude of the vibration signal and the phase angle of the vibration signal based on the rotation signal, based on the rotation signal and the vibration signal extracted by the bandpass filter.

[0147] According to the structure described above [7], by detecting the amplitude and phase of the vibration (vibration with a vibration frequency of one times the rotational speed C) that is synchronized with the rotation of the rotating shaft and displaying it on the display unit, the vibration synchronized with the rotation of the rotating shaft can be evaluated with high precision, and the determination of dangerous speed, contact events, and imbalances of the shaft system of the turbocharger can be performed with high precision.

[0148] [8] In some embodiments, in the structure described in any of [1] to [7] above,

[0149] The filter command value is a current or voltage value obtained by converting the rotational speed of the rotating shaft calculated based on the rotational signal.

[0150] In most cases, the first low-pass filter can set the first cutoff frequency based on the current or voltage value. According to the structure described above [8], since the filter command value is a current or voltage value, the first cutoff frequency can be set arbitrarily based on the rotational speed. In addition, since the first low-pass filter described above is generally inexpensive, the increase in cost can be suppressed.

[0151] [9] In some embodiments, in any of the structures described in [1] to [8] above,

[0152] The rotating shaft includes a marking section (108) configured to give the rotation signal a pulse waveform.

[0153] According to the structure described above [9], since the rotating shaft includes a marking part, the rotation sensor can output a rotation signal with high accuracy compared to the case where the rotation signal is output from a rotating shaft that does not include a marking part.

[0154]

[10] In some embodiments, in the structure described in [9] above,

[0155] The marking portion includes at least two or more grooves (118) formed on the outer peripheral surface (116) of the rotating shaft.

[0156] The rotation sensor is an eddy current displacement sensor that detects the distance (d) of the outer peripheral surface of the rotating shaft by generating eddy currents on the outer peripheral surface of the rotating shaft.

[0157] According to the structure described above

[10] , the rotation sensor can be used with an eddy current sensor. In addition, since at least two or more grooves are formed on the outer circumferential surface of the rotating shaft, the rotation sensor outputs a rotation signal with two or more pulses during one rotation of the rotating shaft. Therefore, compared with the case where a rotation signal with one pulse is output during one rotation of the rotating shaft, the vibration signal can be extracted with high precision.

[0158]

[11] In some embodiments, in the structure described in [9] above,

[0159] The marking portion includes at least two or more grooves formed on the outer peripheral surface of the rotating shaft.

[0160] The rotation sensor is a laser displacement sensor that illuminates the outer peripheral surface of the rotating shaft with a laser and detects the distance to the outer peripheral surface of the rotating shaft by the reflected light of the laser.

[0161] According to the structure described above

[11] , the rotation sensor can be equipped with a laser displacement sensor.

[0162]

[12] The turbocharger (100) according to the present invention comprises:

[0163] The vibration monitoring device described in any one of [1] to

[11] above;

[0164] Compressor (104), the compressor (104) being disposed at one end of the rotating shaft; and

[0165] A turbine (106) is disposed at the other end of the rotating shaft.

[0166] During the operation of the turbocharger, the rotational speed of the turbocharger's rotating shaft varies frequently. According to the structure described above

[12] , the first low-pass filter of the vibration monitoring device sets a first cutoff frequency based on the rotational speed of the rotating shaft. Therefore, by equipping the turbocharger with a vibration monitoring device, a turbocharger that can evaluate the vibration of the turbocharger's rotating shaft based on the rotational signal of the turbocharger's rotating shaft can be provided.

[0167]

[13] In some embodiments, the structure described in

[12] above further includes:

[0168] An acceleration sensor, used to detect engine vibrations; and

[0169] The display unit simultaneously displays vibration information of the engine obtained from the output of the acceleration sensor and vibration information of the rotating shaft obtained from the vibration signal extracted by the at least one filter.

[0170] According to the structure described above

[13] , since the vibration information of the engine can be indirectly obtained through the accelerometer, and by displaying the vibration information of the engine and the vibration information of the turbocharger's rotating shaft simultaneously on the display unit, the vibration of the turbocharger's rotating shaft and the engine vibration can be evaluated without confusion. Therefore, the vibration of the turbocharger's rotating shaft can be evaluated and determined with high precision. In addition, for example, when using a MEMS sensor as the accelerometer, since the MEMS sensor is inexpensive, the vibration of the turbocharger's rotating shaft can be evaluated cheaply and with high precision.

[0171]

[14] In some embodiments, the structure described in

[12] or

[13] above includes:

[0172] A bearing (50) supports the rotating shaft so that it can rotate;

[0173] A bearing temperature sensor (52) is used to detect the temperature of the bearing.

[0174] A lubricating oil outlet temperature sensor (54) detects the temperature of the lubricating oil outlet in the turbocharger; and

[0175] The display unit (44) simultaneously displays the temperature of the bearing detected by the bearing temperature sensor, the temperature of the lubricating oil outlet detected by the lubricating oil outlet temperature sensor, and the vibration information of the rotating shaft obtained from the vibration signal extracted by the at least one filter.

[0176] According to the structure described above

[14] , the condition of the turbocharger can be evaluated accurately based on the temperature information of the bearing and the temperature information of the outlet of the lubricating oil in the turbocharger, thereby improving the evaluation accuracy of the turbocharger's preventive maintenance.

[0177]

[15] The vibration monitoring method of the present invention comprises:

[0178] Step (S2) to output a rotation signal that is synchronized with the rotation of the rotating axis.

[0179] Step (S4) of outputting a filter command value corresponding to the rotational speed of the rotating shaft calculated based on the rotation signal; and

[0180] Step (S6): Extracting a signal passing through the band set according to the filter instruction value from the rotation signal by inputting the rotation signal and the filter instruction value as a vibration signal that can obtain vibration information of the rotation shaft.

[0181] According to the structure described above

[15] , by appropriately setting the passband of at least one filter according to the rotational speed of the rotating shaft, a passband signal suitable for evaluating the vibration of the rotating shaft can be extracted from the rotation signal synchronized with the rotation of the rotating shaft. Therefore, the vibration of the rotating shaft can be evaluated based on the rotation signal of the rotating shaft.

[0182] Symbol Explanation

[0183] 1. Vibration monitoring device

[0184] 2 Rotation sensor

[0185] 4 Output devices

[0186] 6 First low-pass filter

[0187] 10 Second low-pass filter

[0188] 20 Bandpass Filter

[0189] 30 Vector Monitors

[0190] 32 Testing Department

[0191] Display sections 34, 44, and 126

[0192] 40 sensors

[0193] 42 Frame

[0194] 50 bearings

[0195] 52 Bearing Temperature Sensor

[0196] 54 Lubricating oil outlet temperature sensor

[0197] 100 turbocharger

[0198] 102 Rotational axis

[0199] 104 Compressor

[0200] 106 Turbo

[0201] 108 Marking Section

[0202] 116 Outer circumferential surface of the rotating shaft

[0203] 118 slots

[0204] 130 pulses

[0205] A rotation signal

[0206] C Rotational speed

[0207] D filter command value

[0208] E Vibration signal

[0209] F floating signal

[0210] G vibration signal

[0211] d Distance

[0212] S2 Rotation Signal Output Steps

[0213] S4 Filter Command Value Output Steps

[0214] S6 Extraction Steps

Claims

1. A vibration monitoring device, characterized in that, have: A rotation sensor that outputs a rotation signal synchronized with the rotation of the rotating shaft; An output device that outputs a filter command value corresponding to the rotational speed of the rotating shaft calculated based on the rotation signal; as well as At least one filter, which, upon being input to the rotation signal and the filter instruction value, extracts a signal passing through a band region from the rotation signal as a vibration signal capable of acquiring vibration information of the rotation shaft. The at least one filter includes a first low-pass filter. The first low-pass filter extracts a signal in the band that is smaller than the first cutoff frequency set according to the filter command value as the vibration signal by being input with the rotation signal and the filter command value. The first cutoff frequency is set to follow the rotational speed of the rotating axis.

2. The vibration monitoring device according to claim 1, characterized in that, The at least one filter further comprises a second low-pass filter having a second cutoff frequency smaller than the first cutoff frequency.

3. The vibration monitoring device according to claim 2, characterized in that, The second low-pass filter extracts a signal with a frequency lower than the second cutoff frequency from the vibration signal by means of the vibration signal extracted by the first low-pass filter, which is used as a levitation signal to obtain levitation information of the rotating shaft.

4. The vibration monitoring device according to any one of claims 1 to 3, characterized in that, The at least one filter includes a bandpass filter. The bandpass filter extracts a signal containing a center frequency set according to the filter command value from the rotation signal as the vibration signal by being input with the rotation signal and the filter command value.

5. The vibration monitoring device according to claim 4, characterized in that, When the center frequency is set to Fc and the rotational speed of the rotating shaft is set to C, the condition 0.8C≤Fc≤1.2C is satisfied.

6. The vibration monitoring device according to claim 4, characterized in that, It also includes a display unit that displays the amplitude of the vibration signal and the phase angle of the vibration signal based on the rotation signal, based on the rotation signal and the vibration signal extracted by the bandpass filter.

7. The vibration monitoring device according to any one of claims 1 to 3, characterized in that, The filter command value is a current or voltage value obtained by converting the rotational speed of the rotating shaft calculated based on the rotational signal.

8. The vibration monitoring device according to any one of claims 1 to 3, characterized in that, The rotating shaft includes a marking portion configured to give the rotation signal a pulse waveform.

9. The vibration monitoring device according to claim 8, characterized in that, The marking portion includes at least two or more grooves formed on the outer peripheral surface of the rotating shaft. The rotation sensor is an eddy current displacement sensor that detects the distance to the outer peripheral surface of the rotating shaft by generating eddy currents on the outer peripheral surface of the rotating shaft.

10. The vibration monitoring device according to claim 8, characterized in that, The marking portion includes at least two or more grooves formed on the outer peripheral surface of the rotating shaft. The rotation sensor is a laser displacement sensor that illuminates the outer peripheral surface of the rotating shaft with a laser and detects the distance to the outer peripheral surface of the rotating shaft by the reflected light of the laser.

11. A booster, characterized in that, have: Vibration monitoring device as described in any one of claims 1 to 3; A compressor, which is disposed at one end of the rotating shaft; and A turbine is located at the other end of the rotating shaft.

12. The booster according to claim 11, characterized in that, It also has: An acceleration sensor, used to detect engine vibrations; and The display unit simultaneously displays vibration information of the engine obtained from the output of the acceleration sensor and vibration information of the rotating shaft obtained from the vibration signal extracted by the at least one filter.

13. The turbocharger according to claim 11, characterized in that, have: A bearing that supports the rotating shaft so that it can rotate; A bearing temperature sensor that detects the temperature of the bearing; A lubricating oil outlet temperature sensor that detects the temperature of the lubricating oil outlet in the turbocharger; as well as The display unit simultaneously displays the temperature of the bearing detected by the bearing temperature sensor, the temperature of the lubricating oil outlet detected by the lubricating oil outlet temperature sensor, and the vibration information of the rotating shaft obtained from the vibration signal extracted by the at least one filter.

14. A vibration monitoring method, characterized in that, have: The steps for outputting a rotation signal synchronized with the rotation of the rotating axis; The steps of outputting a filter command value corresponding to the rotational speed of the rotating shaft calculated based on the rotation signal; and The step of extracting a signal passing through the band domain, set according to the filter command value, from the rotation signal by inputting the rotation signal and the filter command value, as a vibration signal capable of obtaining vibration information of the rotating shaft. The vibration signal is obtained by inputting the rotation signal and the filter command value, and extracting a signal that passes through the band with a frequency smaller than the first cutoff frequency set according to the filter command value. The first cutoff frequency is set to follow the rotational speed of the rotation axis.

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