JP2014228382A - Pedestal for vibration sensor, portable vibration diagnosis device, and vibration diagnosis method of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pedestal for vibration sensors capable of diagnosing the vibration of a structure with a smaller number of vibration sensors than the conventional art.SOLUTION: In a pedestal 1 for vibration sensors to which vibration sensors for detecting the vibration of a structure are attached, a seating face to which the vibration sensors are attached is formed so that the seating face is different from the plane orthogonal to the diagnostic object direction and is not orthogonal to the plane. By forming the seating face of the pedestal 1 in this manner, one vibration sensor can solely detect the vibration speed in the direction different from the vibration detection direction of the vibration sensor.

Description

  The present invention relates to a vibration sensor pedestal, a portable vibration diagnostic device, and a structure vibration diagnostic method for performing vibration diagnosis of a structure.

  In general, vibration diagnosis of a structure is performed by measuring vibration generated in the structure with a vibration sensor. For example, vibration diagnosis of rotating machines such as blowers and compressors often measures the vibration of a bearing that is one of the components of the rotating machine. This vibration measurement is performed, for example, by attaching a vibration sensor using a piezoelectric element or the like to the bearing.

  In order to perform highly accurate vibration diagnosis, it is preferable to detect vibrations in three directions orthogonal to each other. However, in principle, the vibration detection sensitivity of the vibration sensor is high in only one direction (hereinafter referred to as “vibration detection direction”) and low in the other two directions. For example, since the vibration detection sensitivity in the direction orthogonal to the vibration detection direction of the vibration sensor is only about 3 to 5% of the detection sensitivity in the vibration detection direction, one vibration sensor can detect vibrations in three directions of the rotating machine. I can't.

  For this reason, the conventional vibration diagnosis is performed by attaching the three vibration sensors S to the bearing 2 as shown in FIG. These vibration sensors S are installed such that the vibration detection directions coincide with the rotation axis direction A of the bearing 2 and the horizontal direction H and the vertical direction V perpendicular to the rotation axis direction A in plan view. Thereby, the vibration speed in three directions is detected by each vibration sensor S, and the presence or absence of defects such as unbalance and misalignment occurring in the rotating machine has been confirmed.

  However, when vibration diagnosis (so-called online diagnosis) is performed by permanently installing a vibration sensor in the rotating machine, it is necessary to use three vibration sensors for each rotating machine, resulting in an increase in cost. Further, when performing vibration diagnosis at a plurality of locations in one rotating machine, the number of vibration sensors increases according to the number of diagnosis locations, and the cost increase becomes significant.

  On the other hand, in order to perform vibration diagnosis by reducing the number of vibration sensors, an operator patrols each facility with vibration sensors and attaches vibration sensors when measuring vibrations of rotating machinery. A method of removing the sensor is also conceivable. However, in this case, it is necessary to measure vibrations in three directions one by one with one vibration sensor. Therefore, the measurement is three times as compared with the case of measuring vibrations in three directions using three vibration sensors. It will take time. For this reason, the vibration diagnosis method has a problem in terms of measurement efficiency.

  In the conventional vibration diagnosis method as described above, only one direction of vibration can be detected by one vibration sensor. Therefore, when performing highly accurate vibration diagnosis, is abnormal vibration occurring in the rotating machine itself? Regardless of whether or not, all three directions of vibration were measured. However, when performing vibration diagnosis of a rotating machine, it is only necessary to know whether or not abnormal vibration has occurred, and it is inefficient to perform vibration measurement in three directions until abnormal vibration has not occurred. there were.

  In view of the above circumstances, an object of the present invention is to provide a vibration sensor base, a portable vibration diagnosis device, and a structure vibration diagnosis method capable of performing structure vibration diagnosis with a smaller number of vibration sensors than before. It is in.

  In order to solve the above-described problems, according to the present invention, a vibration sensor pedestal for mounting a vibration sensor for detecting vibration of a structure, wherein the seating surface to which the vibration sensor is mounted is different from a plane perpendicular to the direction of a diagnosis target. A vibration sensor pedestal is provided which is formed into a plane and is not perpendicular to the plane.

  There may be a plurality of diagnosis target directions, and the seating surfaces may be formed such that the angles formed by the seating surfaces and the respective planes orthogonal to the respective diagnosis target directions are equal. Moreover, the magnet may be provided in the vicinity of the attachment surface to a structure.

  According to another aspect of the present invention, there is provided a portable vibration diagnostic apparatus including a sensor unit for detecting vibration of a structure, wherein the sensor unit is provided with the vibration sensor base. An apparatus is also provided.

  In addition, according to the present invention, there is provided a vibration diagnosis method for a structure using a vibration sensor, wherein a vibration detection direction of the vibration sensor is different from a diagnosis target direction and is not orthogonal to the diagnosis target direction. The vibration sensor is installed in the structure as described above, and the maximum value of the vibration in the diagnosis target direction is calculated from the vibration detected by the vibration sensor based on the angle formed by the diagnosis target direction and the vibration detection direction. In addition, there is also provided a vibration diagnosis method for a structure, wherein it is determined whether or not abnormal vibration has occurred in the structure.

  There may be a plurality of diagnosis target directions, and the vibration sensor may be installed in the structure so that the angles formed by the respective diagnosis target directions and the vibration detection directions are equal. Moreover, a magnet base may be attached to the vibration sensor, and the vibration sensor may be installed on the structure.

  According to the present invention, it is possible to detect vibration in a direction different from the vibration detection direction of the vibration sensor with one vibration sensor. Thereby, the number of vibration sensors used for vibration diagnosis of a structure can be reduced.

It is the schematic which shows the attachment state of the base for vibration sensors which concerns on embodiment of this invention. It is the schematic which shows the shape of the base for vibration sensors which concerns on embodiment of this invention. It is the schematic seen from the Z direction in FIG. 1 which shows the attachment state of a vibration sensor. It is the schematic which shows the attachment state of the vibration sensor which concerns on the modification of this invention. It is the schematic which shows a portable vibration diagnostic apparatus provided with the vibration sensor with a magnet. It is the schematic which shows the base for vibration sensors provided with the magnet which concerns on the modification of this invention. It is the schematic which shows the portable vibration diagnostic apparatus provided with the base for vibration sensors which concerns on the modification of this invention. It is the schematic which shows the attachment state of the base for vibration sensors which concerns on the modification of this invention. It is a figure which shows the vibration speed of the horizontal direction H of the rotary machine in an unbalanced state. It is a figure which shows the vibration speed of the axial direction A and the horizontal direction H of the rotary machine in a misalignment state. It is a figure which shows the vibration speed of the axial direction A of the rotary machine in a misalignment state, and the figure which shows the vibration speed of the vibration detection direction AHV. It is the schematic which shows the attachment state of the conventional vibration sensor.

  Hereinafter, the vibration sensor base 1 according to the embodiment of the present invention will be described. The bearing 2 according to the present embodiment supports a rotating shaft (not shown) extending parallel to the horizontal plane as shown in FIG. 1. In the present embodiment, the rotating shaft direction is “axial direction A”. The direction orthogonal to the axial direction A in plan view is referred to as “horizontal direction H”, and the direction orthogonal to the axial direction A and horizontal direction H is referred to as “vertical direction V”. In this embodiment, on the premise that vibration diagnosis in these three directions is performed, the axial direction A, the horizontal direction H, and the vertical direction V are referred to as “diagnosis target directions”, respectively. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the vibration sensor base 1 is attached to a side surface 3 of a bearing 2 that supports a rotating shaft (not shown) of a rotating machine. The side surface 3 of the bearing 2 is a plane parallel to the vertical direction V. The mounting method of the pedestal 1 may be any method as long as the bearing mounting surface 4 of the pedestal 1 can be brought into close contact with the bearing side surface 3. For example, it may be joined by welding or may be fixed with an adhesive.

  As shown in FIG. 2, the pedestal 1 has a shape having an inclined surface such that a part of the straight body is cut obliquely. This inclined surface serves as a seat surface 5 to which the vibration sensor S is attached. The bearing mounting surface 4 of the pedestal 1 is formed such that the sides of the pedestal 1 that are orthogonal to each other when the pedestal 1 is mounted on the bearing 2 are along the axial direction A, the horizontal direction H, and the vertical direction V, respectively. . For this reason, the seat surface 5 of the base 1 is formed so as to form a predetermined angle with respect to each of the plane orthogonal to the axial direction A, the plane orthogonal to the horizontal direction H, and the plane orthogonal to the vertical direction V. . In addition, it is preferable that the angle | corner which the seat surface 5 of the base 1 and each plane orthogonal to each diagnostic object direction make is equal, respectively.

  A hole 6 into which a bolt can be inserted is formed in the seat surface 5, and a female screw is cut inside the hole 6. Thereby, as shown in FIG. 3, the embedded bolt 7, the nut 8 integrated vibration sensor S, and the base 1 can be screwed and fixed. At this time, since the vibration detection direction of the vibration sensor S attached to the base 1 is only one direction along the longitudinal direction of the vibration sensor S, the vibration sensor S attached to the seat surface 5 The vibration in the vertical direction can be detected.

In the present embodiment, as shown in FIG. 2, a direction perpendicular to the seating surface 5 is defined as a “vibration detection direction AHV”. In addition, the angle between the vibration detection direction AHV and the axial direction A is “θ _A ”, the angle between the vibration detection direction AHV and the horizontal direction H is “θ _H ”, and the angle between the vibration detection direction AHV and the vertical direction V is Is defined as “θ _V ”.

  Next, a vibration diagnosis method using the vibration sensor base 1 formed as described above will be described.

  First, the vibration sensor base 1 is welded to the bearing 2 so that the bearing mounting surface 4 of the vibration sensor base 1 shown in FIG. 2 and the bearing side surface 3 shown in FIG. The pedestal 1 may be fixed to the bearing 2 with an adhesive, for example.

  Next, as shown in FIG. 3, the tip of the implanted bolt 7 of the vibration sensor S integrated with the implanted bolt 7 and the nut 8 is inserted into the hole 6 formed in the seat surface 5 of the base 1. Then, the vibration sensor S is fixed to the seat surface 5 of the base 1 by tightening the nut 8. Subsequently, the vibration speed of the bearing 2 is detected by the vibration sensor S. The vibration speed detected at this time is the vibration speed in the direction perpendicular to the seating surface 5 of the pedestal 1, that is, the vibration detection direction AHV.

Since the vibration detection direction AHV has an angle with respect to each diagnosis target direction (axial direction A, horizontal direction H, vertical direction V), the vibration detection sensitivity of the vibration sensor S attached to the pedestal 1 depends on each diagnosis. It becomes lower than the detection sensitivity of the vibration sensor S installed along the target direction. That is, the detection sensitivity of the vibration speed in the vibration detection direction AHV is COSθ _A times, COSθ _H times, or COSθ _V times the detection sensitivity when the vibration sensor S is installed in each diagnosis target direction, so the vibration detection direction AHV vibration velocity in is a COS .theta _a multiple or COS .theta _H times or COS .theta _V times the actual vibration velocity of each diagnosis target direction. Therefore, in order to perform vibration diagnosis of equipment, it is desirable to calculate the vibration speed in each diagnosis target direction from the vibration speed in the vibration detection direction AHV.

However, since the vibration speed V _AHV in the vibration detection direction AHV is a vibration speed in a direction perpendicular to the seating surface 5 of the base 1, the vibration speed V _AHV detected by the vibration sensor S is vibration speed V _a, can not grasp whether it is a vibration speed of the vibration velocity V _V of the vibration velocity V _H, vertical V horizontal H. For this reason, the vibration speed (V _A , V _H , V _V ) in each diagnosis target direction cannot be calculated from the vibration speed V _AHV in the vibration detection direction AHV.

However, in order to make a vibration diagnosis of equipment, it is only necessary to first know whether or not abnormal vibration has occurred in the equipment. Therefore, whether or not abnormal vibration of the equipment has occurred based on the vibration speed _VAHV . What is necessary is just to be able to judge.

As the method, first, using the smallest value among the values of COS .theta _A or COS .theta _H or COS .theta _V, it calculates the vibration speed V from the following equation (1).
V = V _AHV / COSθ (Formula 1)
COSθ: Minimum value among COSθ _A , COSθ _H , and COSθ _V

The reason for using the smallest value is to estimate the maximum value of the vibration speed that can occur in each direction of the diagnostic object of the facility. For example, if the value of COS .theta _V is less than the value of COS .theta _A and COS .theta _H will be calculated vibration velocity V in by using the value of the COS .theta _V (Equation 1). Vibration velocity V calculated this time is greater than the vibration speed V calculated from using COS .theta _A and COS .theta _H (Formula 1). Just because using the value of COS .theta _V, can not be determined actually vibrates in the vertical direction V is generated at the vibration is detected vibrations actually occurring in the vertical direction V by the vibration sensor S There can be. In this case, assuming that are calculated vibration velocity V using the values of COS .theta _A and COS .theta _H, will be performing vibration diagnosis equipment based on low vibration speed V than the actual vibration velocity in the vertical direction V It will cause misdiagnosis. Therefore, in order to appropriately perform the vibration diagnosis of the facility, it is necessary to use the maximum value of the vibration speed that can be generated in the direction of each diagnosis target of the facility in advance.

  Thereafter, the value of the vibration velocity V calculated by the above (Equation 1) is compared with the zone boundary value of the vibration velocity defined in, for example, Annex B of ISO 10816-1. Thereby, it can be determined whether abnormal vibration has occurred in the facility. If it can be determined that abnormal vibration is occurring in the equipment, the vibration in three directions is accurately measured as in the conventional vibration diagnosis method, and what kind of vibration is occurring in which direction is dealt with. .

Note that in the above case (if the value of COS .theta _V is minimum), when the direction in which vibrates actually occurs is, for example, a horizontal direction H, the vibration velocity V calculated in (Equation 1), the actual horizontal The vibration speed V _{H in the} direction H may vary greatly. For this reason, even if the vibration speed V _H is not abnormal vibration, it may be erroneously determined that abnormal vibration has occurred in the equipment by comparing the calculated vibration speed V with the zone boundary value. is there.

To avoid such a situation, COSθ _A, COSθ _H, reducing the difference between the values of COS .theta _V, i.e., θ _A, θ _H, it is preferable to reduce the difference in values of theta _V. The most ideal values of θ _A , θ _H , and θ _V are 45 °. As described above, if the angles θ _A , θ _H , and θ _V formed by the vibration detection direction AHV and each diagnosis target direction are equal to each other, any value of θ _A , θ _H , and θ _V can be used ( Since the vibration speed V calculated by Equation 1) becomes equal, it is possible to appropriately determine whether or not abnormal vibration has occurred when comparing the calculated vibration speed V and the zone boundary value. This eliminates the need to perform an extra three-way vibration diagnosis.

  As described above, according to the present embodiment, the seat of the pedestal 1 is configured such that the vibration detection direction AHV of the vibration sensor S forms a predetermined angle with each diagnosis target direction (axial direction A, horizontal direction H, vertical direction V). Since the surface 5 is formed, the vibration speed in a direction different from the vibration detection direction can be detected by one vibration sensor. Thereby, the number of vibration sensors used for vibration diagnosis of a rotating machine can be reduced.

  For example, if 200,000 yen per unit is required for the purchase and installation of vibration sensors, and if vibration diagnosis is performed at 10 locations in the structure, the conventional vibration diagnosis method uses three vibration sensors for each diagnosis location. This required 6 million yen as the installation cost of the vibration sensor. On the other hand, if the pedestal according to the present embodiment is used, one vibration sensor is sufficient for each diagnosis location, so that the installation cost of the vibration sensor can be suppressed to 2 million yen. Thus, according to this embodiment, the installation cost of a vibration sensor can be suppressed to 1/3. Alternatively, the vibration diagnosis area can be expanded at the same cost.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, as shown in FIG. 4, a magnet base 9 having a magnet inside may be attached to the vibration sensor S. The magnet base 9 is formed with a hole 10 into which the tip of the implantation bolt 7 of the vibration sensor S is inserted, and the inside of the hole 10 is internally threaded. Thereby, the vibration sensor S and the magnet base 9 can be screwed and fixed. If the magnet base 9 is attached to the vibration sensor S in this way, the vibration sensor S can be easily attached to and detached from the seat surface 5 of the vibration sensor base 1. As a result, it is possible to reduce the time required for attaching and detaching the vibration sensor when the equipment is overhauled.

  Further, when performing vibration diagnosis of equipment, as shown in FIG. 5, a portable vibration diagnosis apparatus 11 may be used. The portable vibration diagnostic device 11 includes a sensor unit 12 and an operation & data processing device 13, both of which are connected by a flexible cable 14. If the portable vibration diagnostic apparatus 11 provided with the vibration sensor MS with magnet is used as the sensor unit 12, the vibration sensor MS can be adsorbed to the vibration sensor base 1. In this case, it is not necessary to fix the vibration sensor with bolts and nuts as in the above embodiment, and the vibration sensor can be easily attached and detached. Thereby, the frequency of the disconnection trouble of the sensor cable due to the sensor attachment / detachment failure at the time of machine repair can be reduced.

  As shown in FIG. 6, a magnet 15 may be provided in the vicinity of the bearing mounting surface 4 of the vibration sensor pedestal 1 (hereinafter, the vibration sensor pedestal 1 with a magnet is referred to as a “magnet-type pedestal 16”). Then, as shown in FIG. 7, the sensor unit 12 of the portable vibration diagnostic device 11 (FIG. 5) is attached to the seat surface 5 of the magnet type pedestal 16 so that the vibrations in three directions are simultaneously detected by one vibration sensor S. A portable vibration diagnostic device 17 that can be configured can be configured. If such a vibration diagnostic apparatus 17 is used, the diagnostic efficiency can be reduced to 1/3 with respect to the conventional vibration diagnostic method in which the vibration in one direction is measured by one vibration sensor S one by one. The magnet 15 may be exposed on the surface of the base 1 or may be embedded in the base. In FIG. 7, the flexible cable 14 connected to the vibration sensor S is illustrated, but the flexible cable 14 is connected to the magnet type pedestal 16, and the vibration sensor S is attached to the seat surface 5 of the pedestal 16. May be attached. Even in this case, the vibration diagnosis efficiency can be reduced to 1/3. That is, the sensor unit of the portable vibration diagnostic apparatus provided with a magnet type pedestal belongs to the technical scope of the present invention.

  In the description of the above embodiment, the diagnosis target direction is the axial direction, the horizontal direction, and the vertical direction, but the diagnosis target direction is not limited to these three directions. That is, depending on the type of rotating machine, the manner of rotation, and the like, the direction having a low contribution to the vibration diagnosis may not be the diagnosis target direction. In this case, the seat surface of the pedestal only needs to be formed so as to form a predetermined angle with a plane orthogonal to the diagnosis target direction (for example, two directions). Further, the diagnosis target direction is not limited to three directions orthogonal to each other such as the axial direction, the horizontal direction, and the vertical direction, and may be any direction. Further, the number of diagnosis target directions is also arbitrary.

  In the description of the above embodiment, the vibration diagnosis method according to the present invention is applied to a rotating machine whose rotating shaft extends parallel to the horizontal plane, but may be applied to a rotating machine whose rotating shaft extends in the vertical direction, for example. . That is, the vibration diagnosis method for calculating the maximum value of the vibration speed in the diagnosis target direction from the vibration speed detected by the vibration sensor based on the angle formed by the vibration detection direction and the diagnosis target direction is within the technical scope of the present invention. Belongs.

  In the description of the above embodiment, the shape of the vibration sensor base is such that a part of the rectangular parallelepiped is cut, but the shape of the base is not limited to this. If the seat surface of the pedestal is formed so as to form a predetermined angle with a plane perpendicular to the direction of diagnosis (the vibration detection direction forms a predetermined angle with the direction of diagnosis), the technical scope of the present invention Belongs. The material for the pedestal is not particularly limited. Also, the mounting position of the pedestal is not limited to the side surface of the bearing. For example, it may be mounted on the other surface of the bearing as shown in FIGS. 8A and 8B, or it may be mounted on a component other than the bearing. May be.

  In the description of the above embodiment, the maximum value of the vibration speed is calculated based on the vibration speed detected by the vibration sensor. However, the maximum value of the amplitude is also calculated based on the amplitude detected by the vibration sensor. You can also In the above description of the embodiment, the description has been made on the assumption that the vibration diagnosis of the rotating machine is performed. However, according to the present invention, the vibration diagnosis of the general structure can also be performed.

(Comparative Example 1)
The vibration speed of the rotating machine in an unbalanced state was measured by the conventional vibration diagnosis method shown in FIG. The result of measuring the vibration speed in the horizontal direction H is shown in FIG. When FIG. 9 is seen, a waveform with a large vibration speed in the horizontal direction H can be confirmed. Since unbalanced vibration tends to be larger in the horizontal direction H than in normal times, it was confirmed that vibration in an unbalanced state can be detected by a vibration sensor installed so that the vibration detection direction matches the horizontal direction H. .

(Comparative Example 2)
The vibration speed of a rotating machine in a misaligned state was measured by a conventional vibration diagnosis method. The result of measuring the vibration velocity in the axial direction A is shown in FIG. 10A, and the result of measuring the vibration velocity in the horizontal direction H is shown in FIG. According to FIG. 10A, a waveform having a large vibration speed in the axial direction A can be confirmed. On the other hand, according to FIG. 10B, the waveform of the vibration speed in the horizontal direction H is small, and it has not been possible to determine whether or not the bearing is constantly oscillating. Since misalignment tends to increase the vibration in the axial direction A as compared with the normal time, the vibration sensor installed so that the vibration detection direction matches the axial direction A as shown in FIG. Can be detected appropriately. On the other hand, as shown in FIG. 10B, it was confirmed that the vibration sensor installed so that the vibration detection direction coincides with the horizontal direction H cannot detect the vibration in the axial direction A.

(Example)
The vibration speed of the rotating machine in the misalignment state was measured. FIG. 11A shows the vibration velocity detected using a vibration sensor installed so that the vibration detection direction coincides with the axial direction A. FIG. FIG. 11B shows the vibration speed in the vibration detection direction AHV detected by the vibration sensor installed on the seat surface of the vibration sensor pedestal according to the present invention shown in FIG. In addition, the angle between the seat surface of the pedestal and the surface orthogonal to each diagnosis target direction (axial direction A, horizontal direction H, vertical direction V) is 45 ° (vibration detection direction AHV and each diagnosis). The angle formed with the target direction is 45 °).

  11 (a) and 11 (b), it was possible to confirm a waveform having a large vibration speed, and it was possible to determine whether or not vibration was generated in the bearing. Comparing FIGS. 11 (a) and 11 (b), the wave periods were almost the same. In addition, in FIG. 11A, the maximum vibration speed is about 7 mm / s, whereas in FIG. 11B, it is about 5 mm / s, which is about 0.7 times the maximum vibration of FIG. It was speed. From the results of this example, when the angle formed by the vibration detection direction AHV and the axial direction A is 45 °, the vibration detection sensitivity of the vibration sensor is COS 45 ° times the vibration detection sensitivity installed along the axial direction A, That is, it was confirmed that it was 1 / √2 times (about 0.7 times).

  Here, consider the case where the vibration speed shown in FIG. 11B is detected by the vibration sensor S in the vibration diagnosis of the rotating machine. In this case, if (Equation 1) described in the above embodiment is used, the maximum value of the vibration speed generated in the diagnosis target direction of the rotating machine can be calculated from the vibration speed in the vibration detection direction AHV. At this time, the direction in which the vibration is occurring cannot be determined as the axial direction A, but the zone boundary between the vibration speed calculated by (Equation 1) and the vibration speed defined in Annex B of ISO 10816-1, for example. By comparing with the value, it can be determined that abnormal vibration has occurred in the rotating machine. Thereafter, by performing a conventional three-way vibration diagnosis, it can be confirmed that vibration is generated in the axial direction A, and it is possible to grasp that the rotating machine is in a misalignment state.

  The present invention can be applied to vibration diagnosis of structures.

1 Vibration sensor base 2 Bearing 3 Bearing side surface 4 Bearing mounting surface 5 Seat surface 6 Hole (seat surface)
7 Stud bolt 8 Nut 9 Magnet base 10 Hole
DESCRIPTION OF SYMBOLS 11 Portable vibration diagnostic apparatus 12 Sensor part 13 Operation & data processing apparatus 14 Flexible cable 15 Magnet 16 Magnet type base 17 Portable vibration diagnostic apparatus (with magnet type base)

S Vibration sensor MS Vibration sensor with magnet A Axial direction (diagnosis target direction)
H Horizontal direction (Direction of diagnosis)
V Vertical direction (diagnosis target direction)
AHV vibration detection direction

Claims (7)

A vibration sensor base to which a vibration sensor for detecting vibration of a structure is attached,
The vibration sensor base, wherein a seating surface to which the vibration sensor is attached is different from a plane orthogonal to the diagnosis target direction and is not orthogonal to the plane.   2. The diagnosis surface according to claim 1, wherein there are a plurality of diagnosis target directions, and the seat surfaces are formed so that angles between the seat surface and planes orthogonal to the diagnosis target directions are equal to each other. The pedestal for vibration sensors described in 1.   The vibration sensor base according to claim 1, wherein a magnet is provided in the vicinity of an attachment surface to the structure. A portable vibration diagnostic apparatus having a sensor unit for detecting vibration of a structure,
A portable vibration diagnostic apparatus, wherein the sensor unit is provided with the vibration sensor base according to claim 3. A structure vibration diagnosis method using a vibration sensor,
The vibration sensor is installed in the structure so that the vibration detection direction of the vibration sensor is different from the diagnosis target direction and is not orthogonal to the diagnosis target direction.
Based on the angle formed by the diagnosis target direction and the vibration detection direction, the maximum value of the vibration in the diagnosis target direction is calculated from the vibration detected by the vibration sensor, and whether or not abnormal vibration has occurred in the structure. A method for diagnosing vibration of a structure, characterized in that:   6. The structure according to claim 5, wherein there are a plurality of diagnosis target directions, and the vibration sensor is installed in the structure so that angles formed by the respective diagnosis target directions and the vibration detection directions are equal to each other. Vibration diagnosis method for objects.   7. The structure vibration diagnosis method according to claim 5, wherein a magnet base is attached to the vibration sensor, and the vibration sensor is installed on the structure.

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