Vibration generation source notification device and vibration generation source notification method

Abstract

To provide a vibration generation source notification device that can notify a generation source of vibration without determining a parameter related to attenuation of the vibration.SOLUTION: A vibration generation source notification device 1 comprises: a first vibration sensor 21 and a second vibration sensor 22 that each measure vibration of an object in contact therewith; a time difference calculation unit 32 that calculates the time difference between the vibrations of the object measured by the first vibration sensor 21 and the second vibration sensor 22; a vibration transmission speed setting unit 33 that sets the vibration transmission speed of the object; a generation source direction calculation unit 34 that calculates information on the direction of the generation source of the vibration on the basis of a first time difference calculated by the time difference calculation unit 32 and the vibration transmission speed set by the vibration transmission speed setting unit 33; and a generation source direction output unit 35 that outputs the direction of the generation source.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vibration source notification device and a vibration source notification method. [Background technology]

[0002] In order to investigate the source of noise, vibration, etc., a large number of vibration sensors are placed over a wide area to identify the source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-20841

[0004] Patent Document 1 describes a system that measures vibration levels at at least three locations to determine the location where vibration is occurring. Summary of the Invention [Problem to be solved by the invention]

[0005] The system described in Patent Document 1 measures the location of vibration occurrence based on parameters related to vibration attenuation. However, it is difficult to obtain parameters related to vibration attenuation.

[0006] Therefore, the technique described in Patent Document 1 has a problem in that it is difficult to measure the source of vibration when parameters related to vibration damping cannot be obtained.

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a vibration source notification device that can notify a vibration source without obtaining a parameter related to vibration damping. [Means for solving the problem]

[0008] A vibration source alarm device according to one aspect of the present invention comprises a first vibration sensor and a second vibration sensor that respectively measure vibrations of an object in contact with the device, a first time difference calculation unit that calculates a first time difference between the vibrations of the object measured by the first vibration sensor and the second vibration sensor, respectively, a vibration transmission speed setting unit that sets the vibration transmission speed of the object, a source information calculation unit that calculates information regarding the position of a source of vibration based on the first time difference calculated by the first time difference calculation unit and the vibration transmission speed set in the vibration transmission speed setting unit, and a source information output unit that outputs information regarding the source.

[0009] The source information calculation unit may calculate information about the direction of the vibration source by calculating an angle α that satisfies the following formula (1), where 2a, Δt, and Vc are the distance between the first vibration sensor and the second vibration sensor, the first time difference, and the vibration transmission velocity, respectively.

[0010]

number

[0011] The source information output unit may output the direction of the vibration source relative to the midpoint between the first vibration sensor and the second vibration sensor.

[0012] The vibration source notification device includes a third vibration sensor that measures vibrations of an object in contact with the device, and a second time difference calculation unit that calculates a second time difference between the vibrations of the object measured by the second vibration sensor and the third vibration sensor, wherein the first vibration sensor, the second vibration sensor, and the third vibration sensor are arranged at an equal distance from each other, and the source information calculation unit calculates the coordinates of the intersection of a line passing through the midpoint between the first vibration sensor and the second vibration sensor and a line passing through the midpoint between the second vibration sensor and the third vibration sensor based on the first time difference, the second time difference, and the vibration transmission speed set by the vibration transmission speed setting unit, to calculate the position of the vibration source, and calculates the distance between the center of gravity of a triangle whose vertices are the first vibration sensor, the second vibration sensor, and the third vibration sensor, and the source information output unit outputs the distance.

[0013] The vibration transmission speed setting unit may have the vibration transmission speed of air preset.

[0014] The vibration source notification device may include a housing having a first vibration sensor and a second vibration sensor disposed on a bottom thereof.

[0015] A vibration source notification method according to another aspect of the present invention includes bringing a first vibration sensor and a second vibration sensor into contact with an object to measure vibrations of the object, calculating a first time difference between the vibrations of the object measured by the first vibration sensor and the second vibration sensor, calculating information regarding the position of the vibration source based on the first time difference and the vibration transmission speed, and outputting information regarding the vibration source.

[0016] Calculating information about the position of the vibration source may include calculating an angle α that satisfies the following equation (1) where 2a, Δt, and Vc are the distance between the first vibration sensor and the second vibration sensor, the first time difference, and the vibration transmission velocity, respectively, to calculate information about the direction of the vibration source.

[0017]

number

[0018] Outputting information about the source may include outputting a direction of the source of the vibration relative to a midpoint between the first vibration sensor and the second vibration sensor.

[0019] The vibration source notification method may further include, after measuring vibrations of the object, calculating a first time difference, calculating information related to the position of the source of the vibrations, and outputting the information related to the source, placing the first vibration sensor and the second vibration sensor on different planes, measuring vibrations of the object, calculating the first time difference, calculating information related to the position of the source of the vibrations, and outputting the information related to the source. [Effects of the Invention]

[0020] According to the vibration source notification device and vibration source notification method of the present invention, it is possible to provide a vibration source notification device that can notify the source of vibration without obtaining parameters related to vibration damping. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing an outline of a vibration source notification device according to an embodiment of the present invention; [Figure 2] 2 is a block diagram of the vibration source notification device shown in FIG. 1. FIG. [Figure 3] 2 is an exemplary flowchart of processing by a control device of the vibration source notification device shown in FIG. [Figure 4] 2 is a diagram showing an example of a screen displayed on a touch panel of the vibration source notification device shown in FIG. 1. FIG. [Figure 5] 1. FIG. 4 is a diagram showing another example of a screen displayed on the touch panel of the vibration source notification device shown in FIG. [Figure 6] 2 is a diagram showing an example of a data structure used in the vibration source notification device shown in FIG. 1. FIG. [Figure 7] 2 is a diagram illustrating calculation of the direction of a vibration source by a control device of the vibration source notification device shown in FIG. 1. FIG. [Figure 8] 1. FIG. 4 is a diagram showing another example of a screen displayed on the touch panel of the vibration source notification device shown in FIG. [Figure 9] 2 is a diagram illustrating an example of a hardware configuration of the vibration source notification device illustrated in FIG. 1. FIG. [Figure 10] FIG. 10 is a perspective view showing an outline of a vibration source notification device according to another embodiment of the present invention. [Figure 11] FIG. 11 is a block diagram of the vibration source notification device shown in FIG. [Figure 12] 11 is an exemplary flowchart of processing by a control device of the vibration source notification device shown in FIG. 10. [Figure 13] 11 is a diagram illustrating calculation of the distance to the vibration source by the control device of the vibration source notification device shown in FIG. 10. FIG. [Figure 14] 11 is another diagram illustrating the calculation of the distance to the vibration source by the control device of the vibration source notification device shown in FIG. [Figure 15] 11 is a diagram illustrating an example of searching for a vibration source using the vibration source notification device shown in FIGS. 1 and 10. FIG. [Figure 16] 11 is a diagram illustrating another example of searching for a vibration source using the vibration source notification device shown in FIGS. 1 and 10. FIG. [Figure 17] 11 is a diagram illustrating another example of searching for a vibration source using the vibration source notification device shown in FIGS. 1 and 10. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0023] (Vibration source alarm device 1) 1, a vibration source alarm device 1 according to a first embodiment uses two vibration sensors 20 to measure vibrations of an object and alarm the direction of the vibration source. The vibration source alarm device 1 includes a housing 10, a battery 11 arranged inside the housing 10, the vibration sensors 20, a control device 30, and a touch panel 40 attached to the surface of the housing 10. The battery 11, the vibration sensors 20, the control device 30, and the touch panel 40 are connected by wiring (not shown).

[0024] (Vibration sensor 20) The vibration sensor 20 is a sensor that measures vibrations of an object in contact with the sensor. More specifically, the vibration sensor 20 includes a first vibration sensor 21 and a second vibration sensor 22 that can measure vibrations of an object in contact with the sensor. Hereinafter, the first vibration sensor 21 and the second vibration sensor 22 provided in the vibration source alarm device 1 may be collectively referred to as the vibration sensor 20.

[0025] The first vibration sensor 21 and the second vibration sensor 22 are disposed on the bottom surface BM of the housing 10. A user can bring the first vibration sensor 21 and the second vibration sensor 22 into contact with an object by, for example, pressing the bottom surface BM of the housing 10 against the object, thereby measuring the vibrations of the object.

[0026] The vibration sensor 20 is, for example, a piezoelectric vibration sensor, and is a sensor that converts into voltage the pressure applied to the diaphragm (not shown), the strain and displacement occurring on the diaphragm, etc. However, the type of vibration sensor 20 is not limited to the piezoelectric type, and may be, for example, a magnetic type, an inductive type, a mechanical type, or other type.

[0027] (Control device 30) 2 controls each part of the vibration source notification device 1. The control device 30 includes a vibration data acquisition unit 31 that acquires vibration data related to vibrations measured by the first vibration sensor 21 and the second vibration sensor 22, a time difference calculation unit 32 that calculates the time difference between the vibrations measured by the vibration sensors 21 and 22, a vibration transmission speed setting unit 33 that sets the vibration transmission speed of the target (the propagation speed of the vibration wave), a source direction calculation unit 34 that calculates the direction of the vibration source, and a source direction output unit 35.

[0028] An overview of the control by the control device 30 will be described with reference to the block diagram in Fig. 2 and the flowchart in Fig. 3. First, the vibration data acquisition unit 31 acquires vibration data relating to vibrations measured by the first vibration sensor 21 and the second vibration sensor 22 (S101). Next, the time difference calculation unit 32 calculates the time difference between the vibrations measured by the first vibration sensor 21 and the second vibration sensor 22 from the vibration data acquired by the vibration data acquisition unit 31 (S102). Next, the vibration transmission speed setting unit 33 sets the transmission speed of vibration required for subsequent calculations (S103). At this point, the parameters required to calculate the direction of the vibration source are obtained.

[0029] Next, the source direction calculation unit 34 calculates the tangent (tan) value (S104). Subsequently, the source direction calculation unit 34 calculates the arctangent (arctan) value (S105). Finally, the source direction output unit 35 outputs the direction of the source based on the calculated angle (S106).

[0030] The flow of each step will be described in detail below. Note that the flowchart shown in FIG. 3 is an example, and the details and order of each step may be changed as appropriate. For example, setting the transmission speed (S103) may be performed before obtaining vibration data (S101) or calculating the time difference (S102). Furthermore, the processing flow shown in FIG. 7 may be repeated two or more times.

[0031] (Vibration data acquisition unit 31) The vibration data acquisition unit 31 acquires vibration data relating to vibrations measured by the first vibration sensor 21 and the second vibration sensor 22, respectively, from the first vibration sensor 21 and the second vibration sensor 22 (S101). The vibration data is, for example, time-series data in which the voltage value output from the first vibration sensor 21 or the second vibration sensor 22 is associated with time.

[0032] The vibration data acquiring unit 31 may perform processes such as normalization, filtering, and noise removal on the vibration data acquired from the first vibration sensor 21 and the second vibration sensor 22. For example, when low-frequency vibrations are expected, the vibration data acquiring unit 31 may acquire the vibration data through a low-pass filter.

[0033] (Time difference calculation unit 32) The time difference calculation unit 32 calculates the time difference between the vibrations measured by the first vibration sensor 21 and the second vibration sensor 22 from the vibration data acquired by the vibration data acquisition unit 31 (S102). The time difference calculation unit 32 obtains the times of local peaks of the voltage values ​​included in the vibration data acquired by the vibration data acquisition unit 31 for each of the first vibration sensor 21 and the second vibration sensor 22, and calculates the difference between these times to calculate the time difference.

[0034] The method for calculating the time difference between the vibration data by the time difference calculation unit 32 is not limited to the above. For example, the time difference calculation unit 32 may find the correlation between the two vibration data from the first vibration sensor 21 and the second vibration sensor 22 acquired by the vibration data acquisition unit 31, and calculate the difference in time at which the patterns of the two vibration data most closely match.

[0035] (Vibration transmission speed setting unit 33) The vibration transmission velocity setting unit 33 sets the vibration transmission velocity Vc, which is one of the parameters for calculating the direction of a vibration source or the distance to the vibration source (described later) (S103). The vibration transmission velocity setting unit 33 sets the vibration transmission velocity Vc, for example, as described below, based on a selection operation received by the touch panel 40 and a list of the vibration transmission velocities Vc.

[0036] As shown in Fig. 4, a list of candidate materials for the measurement object, such as "air," "wood," "stone," and "aluminum," which are registered in advance in the vibration source notification device 1 (see Fig. 1), is displayed on the touch panel 40. The candidate materials for the measurement object may be displayed on the touch panel 40 so that they can be scrolled and selected in response to a user operation. Furthermore, "air" may be displayed and selected in advance on the touch panel 40.

[0037] As shown in Figure 5, the material of the measurement target is selected by the user operating the touch panel 40 (see Figure 2) to select one of the candidate materials of the measurement target (for example, "wood") from the list shown in Figure 4.

[0038] The vibration transmission velocity setting unit 33 sets the vibration transmission velocity Vc corresponding to the material of the selected measurement object by referring to transmission velocity data stored in the control device 30. The transmission velocity data is, for example, as shown in Fig. 6, and has a data structure in which the material of the measurement object and the transmission velocity are in one-to-one correspondence.

[0039] The method by which the vibration transmission velocity setting unit 33 sets the vibration transmission velocity Vc is not limited to the above. For example, the vibration transmission velocity setting unit 33 may set the vibration transmission velocity Vc to a numerical value input into a numerical value input form displayed on the touch panel 40. Furthermore, the vibration transmission velocity setting unit 33 may calculate the vibration transmission velocity Vc of the target by calculating the square root of the ratio of the target's bulk modulus to the target's density, based on the target's density value and bulk modulus value input into the touch panel 40.

[0040] (Source direction calculation unit 34) The source direction calculation unit 34 (see FIG. 2) calculates the direction of the vibration source, for example, by performing the calculations described below. Specifically, the source direction calculation unit 34 calculates the tangent (tan) value of the angle formed by the line connecting the reference point and the vibration source and the reference line (S104), and calculates the arctangent (arctan) value from the tangent value to calculate the direction of the vibration source (S105).

[0041] In the following, with reference to FIG. 7, in order to explain the calculations performed by the source direction calculation unit 34, the mathematical expressions and coordinate system used in the calculations will be defined.

[0042] In the xy plane shown in FIG. 7, the first vibration sensor 21 is located at point PA(-a,0), the second vibration sensor 22 is located at point PB(a,0), and the vibration source is located at point PS(x,y). A perpendicular line is drawn from point PB to a line passing through points PA and PS, and the intersection of the line passing through points PA and PS is defined as point PC. If the acute angle of the interior angles of the right triangle formed by points PA, PB, and PC, with point PA as the vertex, is defined as α, the other acute angle is (90°-α). Furthermore, if the angle formed by the line passing through origin O and point PS and the x-axis is defined as α', then if point PS is located far enough away compared to the distance (2a) between points PA and PB, then α' can be approximated as α. Therefore, hereinafter, calculations will be performed assuming α'=α where appropriate.

[0043] In general, the distance between two points can be calculated by multiplying the elapsed time by the propagation speed of the wave. Therefore, the difference between the distance between points PS and PA and the distance between points PS and PB can be calculated by multiplying the difference between the time it takes for vibration transmitted from point PS to reach point PA and the time it takes for vibration to reach point PB by the propagation speed of the wave in the medium. If the time difference is Δt and the propagation speed in the medium is Vc, then the difference between the distance between points PS and PA and the distance between points PS and PB is the product of Δt and Vc, and this difference in distance roughly corresponds to the distance between points PA and PC.

[0044] In the right triangle shown in Figure 7, with points PA, PB, and PC as vertices, the length of the line segment connecting points PA and PB is 2a, so the following equation holds true according to the sine theorem. 2a / sin(90°)=Δt·Vc / sin(90°-α)

[0045] By rearranging the above formula, 2a=Δt·Vc / cos(α) This becomes:

[0046] Therefore, cos(α) can be calculated using the following formula:

[0047]

number

[0048] In addition, tan(α) can be obtained by substituting cos(α) into the following known trigonometric function relational expression:

[0049]

number

[0050] That is, tan(α) is calculated based on a, Δt, and Vc as shown in the following formula (1).

[0051]

number

[0052] 2a is the distance between points PA and PB, and is a value specified in advance because it is the distance (see FIG. 1) between first vibration sensor 21 and second vibration sensor 22 arranged on the bottom surface of vibration source notification device 1. Source direction calculation unit 34 calculates tan(α) by substituting the distance between first vibration sensor 21 and second vibration sensor 22, the time difference Δt calculated by time difference calculation unit 32, and the vibration transmission velocity Vc set by vibration transmission velocity setting unit 33 into a mathematical formula.

[0053] Next, the source direction calculation unit 34 calculates the angle α from the value of tan(α). The source direction calculation unit 34 may calculate the angle α, for example, by substituting it into a known formula for calculating the arctangent (arctan) or by referencing a lookup table. Furthermore, to uniquely calculate the angle α, the source direction calculation unit 34 may use additional information, for example, the sign of the time difference Δt.

[0054] (Source direction output unit 35) 8, the source direction output unit 35 displays the direction represented by the angle α calculated by the source direction calculation unit 34, for example, as an arrow AR on the touch panel 40 (described later). The source direction output unit 35 may perform a coordinate conversion process to convert the coordinates on the xy plane shown in FIG. 8 into coordinates on the touch panel 40, so that the arrow AR points in the direction of the point PS in FIG. 8.

[0055] (Touch panel 40) The touch panel 40 is a device that displays information to the user and accepts input from the user. The user selects information by touching points on the touch panel 40 with their finger. The user may also swipe to scroll objects such as lists displayed on the touch panel 40, or touch a keyboard displayed on the touch panel 40 to input text, numbers, etc. Furthermore, letters, figures, numbers, etc. calculated by the control device 30 may be displayed on the touch panel 40.

[0056] 9 shows an example of the hardware configuration of an information processing device 60 that realizes the functions of the control device 30 (see FIG. 2). The information processing device 60 is, for example, a computer, and includes a processor 61 that executes various calculations, a main memory device 62 and an auxiliary memory device 63 that store information, a communication interface 64 that mediates communication with other devices, and an internal bus 65. The specific hardware configuration of the information processing device 60 that realizes the functions of the control device 30 is not limited to that described above.

[0057] 2 is connected to the control device 30 by wiring, and the battery 11 is connected to the control device 30 and the touch panel 40 by wiring. The control device 30 and the touch panel 40 operate by receiving power from the battery 11.

[0058] The vibration source notification device 1 (see FIG. 1) is used, for example, as follows. A user places the vibration source notification device 1 on a vibrating floor, for example, with the bottom of the housing 10 facing downwards, and searches for vibrations transmitted to the floor. The user operates the touch panel 40 to touch and select "wood" (see FIG. 5) as the floor material from a list of candidates (see FIG. 4). When the user performs the above operation, an arrow AR indicating the direction of the vibration source is displayed on the touch panel 40 of the vibration source notification device 1 placed on the floor (see FIG. 8).

[0059] 8, an arrow AR is displayed on the touch panel 40, allowing the user to intuitively operate the vibration source notification device 1. In addition to or instead of the arrow AR, the location of the vibration source may be displayed superimposed on a map, a building layout diagram, or the like.

[0060] In this way, the vibration source notification device 1 can notify the direction of the vibration source without obtaining parameters related to vibration damping.

[0061] (Vibration source alarm device 2) A vibration source alarm device 2 according to a second embodiment shown in Fig. 10 alarms not only the direction of a vibration source but also the distance to the vibration source. The following description will focus on the differences from the vibration source alarm device 1 (see Figs. 1 and 2).

[0062] 10 includes a third vibration sensor 23 in addition to a first vibration sensor 21 and a second vibration sensor 22. The third vibration sensor is also disposed on the bottom surface of the housing 10, similar to the first vibration sensor 21 and the second vibration sensor 22. The first vibration sensor 21, the second vibration sensor 22, and the third vibration sensor 23 are disposed equidistant from one another. Hereinafter, the first vibration sensor 21, the second vibration sensor 22, and the third vibration sensor 23 provided in the vibration source notification device 2 may be collectively referred to as vibration sensors 20.

[0063] 11 , the vibration source notification device 2 includes a control device 50. The control device 50 includes a vibration data acquisition unit 51, a first time difference calculation unit 52, a second time difference calculation unit 53, a vibration transmission speed setting unit 54, a source direction calculation unit 55, a source direction output unit 56, a source distance calculation unit 57, and a source distance output unit 58.

[0064] An overview of the control performed by the control device 50 will be described with reference to the block diagram of FIG. 11 and the flowchart of FIG.

[0065] First, the vibration data acquisition unit 51 acquires vibration data relating to vibrations measured by the first vibration sensor 21, the second vibration sensor 22, and the third vibration sensor 23 (S201). The first time difference calculation unit 52 calculates the time difference (first time difference) between the vibrations measured by the first vibration sensor 21 and the second vibration sensor 22 from the vibration data acquired by the vibration data acquisition unit 51 (S202). The second time difference calculation unit 53 calculates the time difference (second time difference) between the vibrations measured by the second vibration sensor 22 and the third vibration sensor 23 (S203). Next, the vibration transmission speed setting unit 54 sets the transmission speed required for subsequent calculations (S204). At this stage, parameters required for calculating the distance to the source of vibration, etc., are obtained.

[0066] Next, source direction calculation unit 55 calculates the tangent (tan) value of line L1 (described later) (S205). Source direction calculation unit 55 calculates the tangent (tan) value of line L2 (described later) (S206). Next, source distance calculation unit 57 calculates the intersection of line L1 and line L2 (S207). Source distance calculation unit 57 calculates the distance to the source of the vibration (S208). Finally, source distance output unit 58 outputs the calculated distance (S209). Each step will be described in detail below.

[0067] The vibration data acquisition unit 51 acquires vibration data relating to the vibrations measured by the vibration sensors 21, 22, and 23 (S201).

[0068] First time difference calculation unit 52 calculates a first time difference between the vibration measured by first vibration sensor 21 and the vibration measured by second vibration sensor 22 (S202). Second time difference calculation unit 53 calculates a second time difference between the vibration measured by first vibration sensor 21 and the vibration measured by 23 (S203). The calculation of the first time difference by first time difference calculation unit 52 (S202) and the calculation of the time difference by second time difference calculation unit 53 (S203) may be performed in advance of or simultaneously with the calculation of the first time difference.

[0069] The setting of the vibration transmission velocity by the vibration transmission velocity setting unit 54 (S204) is similar to the setting of the vibration transmission velocity by the vibration transmission velocity setting unit 33 (see FIG. 2) (S103, see FIG. 4).

[0070] (Distance estimation) The source distance calculation unit 57 estimates the distance to the source of the vibration based on the vibrations of the first vibration sensor 21, the second vibration sensor 22, and the third vibration sensor 23 as follows.

[0071] In the xy plane shown in Figure 13, the first vibration sensor 21 is located at point PA (-a, 0), the second vibration sensor 22 at point PB (a, 0), the third vibration sensor 23 at point PD (0, √3a), and the vibration source at point PS (x, y). The three points PA, PB, and PD correspond to the vertices of an equilateral triangle with a side length of 2a. If the midpoint between points PB and PD is defined as point PE, the coordinates of point PE are (a / 2, √3a / 2). The line passing through points PE and PS is defined as line L2, and the angle that line L2 makes with the line passing through points PB and PD is defined as β.

[0072] A straight line L1 that passes through the origin and the vibration source PS is expressed by the following equation (2).

[0073]

number

[0074] Also, a straight line L2 that passes through the point PE(a / 2,√3a / 2) and the vibration source PS is expressed by the following formula (3).

[0075]

number

[0076] The coordinates obtained by the calculation to find the intersection of the lines L1 and L2 are the coordinates of the vibration source point PS(x,y). The source direction calculation unit 55 calculates tan(α) of the line L1 in the same way as the source direction calculation unit 34 (see FIG. 2) calculates the direction of the point PS(x,y) (S205, see FIG. 7).

[0077] The source direction calculation unit 55 calculates tan(β) of the line L2 (S206). For example, the source direction calculation unit 55 obtains tan(β) by the same calculation as tan(α). Specifically, the source direction calculation unit 55 performs coordinate transformation on the point PS(x, y) by translating the point PE to the origin O and rotating the point PS by 60° around the origin O so that the point PD corresponds to the point PA and the point PE corresponds to the origin O, and calculates tan(α). Next, for example, the source direction calculation unit 55 may perform a calculation to restore the translation and rotation.

[0078] The source direction calculation unit 55 may calculate tan(α) of the line L1 (S205) after or simultaneously with the calculation of tan(β) of the line L2 (S206).

[0079] 14, the source distance calculation unit 57 calculates the intersection of the lines L1 and L2 from tan(α) and tan(β) calculated by the source direction calculation unit 55 (S207). For example, the source distance calculation unit 57 finds the coordinates of the vibration source PS, which is the intersection, by a method of calculating simultaneous equations with two unknowns.

[0080] Next, the source distance calculation unit 57 calculates the distance between the point PS and the center of gravity PF of the equilateral triangle formed by the points PA, PB, and PD (S208). For example, the source distance calculation unit 57 may use Pythagoras' theorem to calculate the distance between the point x (0,√3 / 3a), which is the center of gravity PF, and the point PS.

[0081] Generation source distance output unit 58 outputs the distance calculated by generation source distance calculation unit 57 as a numerical value (S209). For example, generation source distance output unit 58 may cause touch panel 40 to display the numerical value of the distance calculated by generation source distance calculation unit 57.

[0082] The method of outputting the distance or displaying the distance on the touch panel 40 is not limited to the one described above, and for example, the color displayed on the touch panel 40 may be different depending on the distance between the vibration source alarm device 2 and the vibration source, or a straight line corresponding to the distance may be superimposed on a map displayed on the touch panel 40.

[0083] In this way, the distance to the vibration source can be notified by the vibration source notification device 2. Below, specific application scenarios will be given to describe examples of use of the vibration source notification devices 1 and 2 to search for a vibration source.

[0084] (Application example) 15 to 17, an example of use of searching for a vibration source using the vibration source alarm devices 1 and 2 will be described. The user may start the search from the problem occurrence point SP and try the search two or more times while changing the position or orientation of the vibration source alarm devices 1 and 2 until the vibration source EP is identified.

[0085] FIG. 15 shows an example of an application in which a user who notices a vibration problem inside a building OB, such as a three-story office building, uses vibration source notification devices 1 and 2 to search for the floor on which the vibration source is located.

[0086] For example, a user who notices a vibration problem on the third floor (problem occurrence point SP) of building OB places the vibration source alarm device 1 on the third floor and performs a first trial TR1 to search for the vibration source. The user, for example, finds no vibration source in the direction of the arrow AR displayed on the vibration source alarm device 1, and therefore performs a second trial TR2 to a fourth trial TR4. For example, in the second trial TR2 and the third trial TR3 performed on the third and second floors, the vibration source alarm device 1 displays an arrow AR pointing in the direction of the floor below. Following these displays (alerts), the user can identify the vibration source EP on the first floor, for example, by the fourth trial TR4.

[0087] As shown in Fig. 15, after placing the vibration source alarm device 1 on the floor and searching for the source of vibration transmitted to the floor, the user may next search for the source of vibration transmitted to the wall. Specifically, the user may raise the bottom surface of the vibration source alarm device 1 perpendicular to the floor and press the floor surface of the vibration source alarm device 1 against the wall, with the vibration sensor 20 positioned on the wall, and search for the source of vibration transmitted through the wall. In this case, if the materials of the floor and the wall are different and the vibration transmission speeds are different, the user may operate the touch panel 40 to reset the vibration transmission speed. Alternatively, the user may place the bottom surface of the vibration source alarm device 1 on the ceiling.

[0088] As another example of use, as shown in Figure 16, in a building HC such as a three-story apartment building, a user in room 201 on the second floor who notices a problem with vibrations such as footsteps coming from the floor above searches for the source of the vibrations within the building HC.

[0089] First, the user places the bottom surface of the vibration source alarm device 1 against the wall and performs a first trial TR1 in his or her own room. Contrary to expectations, an arrow AR indicating the direction of the floor below is displayed on the vibration source alarm device 1, so the user places the bottom surface of the vibration source alarm device 1 on the floor of, for example, Room 201 and performs a second trial TR2. In the second trial TR2, an arrow AR indicating the direction of Room 202, the neighboring section, is displayed on the vibration source alarm device 1.

[0090] This allows the user to determine that the vibration source EP is not on the floor above, but in the adjacent block (Room 202) on the same floor. Generally, when vibrations such as footsteps become a problem in an apartment building, suspicion is often placed on the dwelling unit on the floor above. The vibration source alarm device 1 makes it easy to identify the source of vibrations, thereby reducing the possibility of trouble with neighbors.

[0091] As another example of use, as shown in FIG. 17, a user may use the vibration source notification devices 1 and 2 to search for a vibration source in another building beyond the building (see building HC in FIG. 15).

[0092] For example, in an industrial park or the like where multiple buildings (buildings) PL1 to PL4 are located, a user who notices a vibration problem places vibration source alarm devices 1 and 2 on the ground at problem point SP and searches for the vibration source. In a first trial TR1, vibration source alarm device 1 displays an arrow AR indicating the direction of building PL2, or vibration source alarm device 2 displays "30 m" as the distance to the vibration source. By looking at the displays on vibration source alarm devices 1 and 2, the user can identify that vibration source EP is in building PL2. Vibration source alarm devices 1 and 2 can identify vibration source EP even if the user cannot approach building PL2, for example, because building PL2 is located within another administrator's site PT and access to that site PT is prohibited.

[0093] As described above, by repeatedly searching while changing the positions and orientations of the vibration source notification devices 1 and 2 in various ways, the user can efficiently search for the source of vibration.

[0094] The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the above-described embodiments are intended to explain the present invention and do not limit the scope of the present invention. That is, the scope of the present invention is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of the invention equivalent thereto are considered to be within the scope of the present invention. [Explanation of symbols]

[0095] 1,2 Vibration source alarm device 10. Cabinet 11 Batteries 20 Vibration Sensor 21 First vibration sensor 22 Second vibration sensor 23 Third vibration sensor 30,50 Control device 31,51 Vibration data acquisition unit 32 Time difference calculation section 33,54 Vibration transmission speed setting section 34,55 Source direction calculation section 35,56 Source direction output section 40 Touch Panel 52 1st time difference calculation section 53 2nd time difference calculation section 57 Source distance calculation section 58 Source distance output section 60 Information Processing Device 61 processors 62 Main storage 63 Auxiliary storage device 64 Communication Interface 65 Internal Bus BM bottom

Claims

1. a first vibration sensor and a second vibration sensor that measure vibrations of an object in contact with the first vibration sensor and a second vibration sensor, respectively; a first time difference calculation unit that calculates a first time difference between the vibrations of the object measured by the first vibration sensor and the second vibration sensor; a vibration transmission speed setting unit that sets a vibration transmission speed of the target; a source information calculation unit that calculates information about a position of a source of the vibration based on the first time difference calculated by the first time difference calculation unit and the vibration transmission speed set in the vibration transmission speed setting unit; a source information output unit that outputs information about the source, Vibration source alarm device.

2. The source information calculation unit calculates an angle α that satisfies the following formula (1) by assuming that the distance between the first vibration sensor and the second vibration sensor, the first time difference, and the vibration transmission velocity are 2a, Δt, and Vc, respectively, to calculate information about the direction of the vibration source: The vibration source alarm device according to claim 1 . [Equation 1]

3. the source information output unit outputs a direction of the vibration source relative to a midpoint between the first vibration sensor and the second vibration sensor. The vibration source alarm device according to claim 2 .

4. a third vibration sensor that measures vibrations of an object in contact with the third vibration sensor; a second time difference calculation unit that calculates a second time difference between the vibrations of the object measured by the second vibration sensor and the third vibration sensor, the first vibration sensor, the second vibration sensor, and the third vibration sensor are disposed equidistant from one another; the source information calculation unit calculates the coordinates of an intersection of a line passing through a midpoint between the first vibration sensor and the second vibration sensor and a line passing through a midpoint between the second vibration sensor and the third vibration sensor based on the first time difference, the second time difference, and the vibration transmission speed set by the vibration transmission speed setting unit, to calculate the position of the vibration source, and calculates the distance between the vibration source and the center of gravity of a triangle whose vertices are the first vibration sensor, the second vibration sensor, and the third vibration sensor, the source information output unit outputs the distance. The vibration source alarm device according to claim 1 .

5. The vibration transmission speed setting unit presets a vibration transmission speed of air. The vibration source alarm device according to claim 1 .

6. a housing having the first vibration sensor and the second vibration sensor disposed at a bottom thereof; The vibration source alarm device according to claim 1 .

7. measuring vibrations of the object with a first vibration sensor and a second vibration sensor in contact with the object; calculating a first time difference between vibrations of the object measured by the first vibration sensor and the second vibration sensor; calculating information about a location of a source of the vibration based on the first time difference and a vibration transmission velocity; and outputting information about the source. Vibration source notification method.

8. Calculating the information regarding the position of the vibration source includes calculating an angle α that satisfies the following formula (1) where 2a, Δt, and Vc are the distance between the first vibration sensor and the second vibration sensor, the first time difference, and the vibration transmission velocity are respectively, to calculate information regarding the direction of the vibration source. The vibration source notification method according to claim 7. [Equation 2]

9. outputting information about the source outputting a direction of a source of the vibration relative to a midpoint between the first vibration sensor and the second vibration sensor; The vibration source notification method according to claim 8.

10. After measuring the vibration of the object, calculating the first time difference, calculating information about a location of a source of the vibration, and outputting information about the source, further comprising: disposing the first vibration sensor and the second vibration sensor on different planes; measuring vibrations of the object; calculating the first time difference; calculating information about a location of a source of the vibrations; and outputting information about the source. The vibration source notification method according to claim 7.

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