ELEVATOR AND METHOD

Abstract

To provide an elevator and a method capable of improving vibration and noise inside a car without incurring a large cost in an elevator not having a sufficient vibration-proof structure. [Solution] According to an embodiment, the elevator is equipped with a car to which vibration-damping paint is applied based on the results of vibration analysis performed on an analytical model of the car composed of multiple elements divided based on the finite element method.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE Embodiments of the present invention relate to elevators and methods. [Background technology]

[0002] Recent elevators have a sufficient vibration-proof structure to suppress vibration and noise inside the car. On the other hand, older elevators and freight elevators with low performance requirements for vibration and noise inside the car often do not have a sufficient vibration-proof structure. For this reason, some users of older elevators and freight elevators sometimes request improvements in vibration and noise inside the car.

[0003] As a method for meeting such a demand, there is an example of a renewal such as a complete removal renewal or a partial removal renewal, but such a large-scale structural change has a problem of being very costly. Therefore, it is desired to realize a new technology that can meet the above demand without incurring a large cost. In other words, it is desired to realize a new technology that can improve the vibration and noise inside the car in an elevator that does not have a sufficient vibration-proof structure without incurring a large cost. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4362966 [Patent Document 2] JP 2007-284153 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the problem to be solved by the present invention is to provide an elevator and a method capable of improving vibration and noise inside the car without incurring a large cost in an elevator that does not have a sufficient vibration-proof structure. Note that even if a sufficient vibration-proof structure is provided at the time of manufacture, there is a possibility that even more is required, so the present invention can also be applied in cases where a stronger vibration-proof structure is required. [Means for solving the problem]

[0006] According to one embodiment, the elevator is equipped with a car that is coated with vibration-damping paint based on the results of a vibration analysis performed on an analytical model of the car composed of multiple elements divided based on the finite element method. The vibration-damping paint is applied to the car based on the response magnification at each node of the plurality of elements obtained as a result of the vibration analysis. When a first node among the nodes of the plurality of elements indicates a first response magnification and a second node different from the first node indicates a second response magnification smaller than the first response magnification, the vibration-damping paint is applied thicker to a first location of the car corresponding to the first node than to a second location of the car corresponding to the second node. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of an elevator car. [Diagram 2] FIG. 2 is a diagram showing an example of an analytical model created based on the finite element method. [Diagram 3] FIG. 3 is a diagram showing an example of a result of a vibration analysis performed using the analysis model shown in FIG. [Figure 4] FIG. 4 shows an example of the results of a vibration analysis performed using the analysis model shown in FIG. 2, and is a diagram showing the maximum value of the response magnification at each node included in the analysis model. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment will be described with reference to the drawings. First, a configuration example of a car 1 will be described with reference to Fig. 1. In this embodiment, the car 1 will be described as a car for a freight elevator having low performance requirements for vibration and noise inside the car.

[0009] The car 1 moves in a hoistway, carrying, for example, baggage and a user carrying the baggage. As shown in Fig. 1, the car 1 includes a car frame 2 and a car chamber 3 arranged in the car frame 2.

[0010] The car frame 2 has an upper beam 4, a lower beam 5, and a pair of vertical frames 6. The upper beam 4, lower beam 5, and vertical beam 6 are connected to form a rectangular frame surrounding the car chamber 3. The upper beam 4 is connected to the pair of vertical frames 6 above the car chamber 3, and the lower beam 5 is connected to the pair of vertical frames 6 below the car chamber 3. The car 1 is suspended, for example, by a main beam (not shown) attached to the upper beam 4.

[0011] As described above, the car 1 is a car for a freight elevator that has low performance requirements for vibration and noise inside the car, so that no vibration-damping rubber made of an elastic body having vibration-damping properties is provided under the floor surface 3a of the car room 3. In other words, the car 1 has only a minimum vibration-proof structure, and does not have a sufficient vibration-proof structure to provide users with a comfortable ride. This makes it possible to reduce the cost of introducing the elevator.

[0012] However, some users of such elevator cars 1 may request improvements to vibrations and noises inside the car. As a method for responding to such requests, a total removal renewal or partial removal renewal may be mentioned as an example, but such a large-scale structural change has a problem of being very costly.

[0013] Therefore, in this embodiment, a method capable of improving (suppressing) the vibration and noise inside the car 1 without incurring a large cost will be described.

[0014] One method for improving vibration and noise inside the car 1 without incurring a large cost is to attach a vibration-damping material or a sound-absorbing material to the outer surface of the car chamber 3 of the car 1. However, when attaching a vibration-damping material or a sound-absorbing material to the outer surface of the car chamber 3 of the car 1, a process of cutting the vibration-damping material or the sound-absorbing material to fit the shape of the car chamber 3 is required, which is time-consuming.

[0015] Furthermore, the vibrations and noise generated within the car chamber 3 do not occur uniformly throughout the car chamber 3; the presence or absence and the magnitude of vibrations and noise vary from place to place within the car chamber 3. Therefore, simply attaching vibration-damping material or sound-absorbing material uniformly to the outer surface of the car chamber 3 may not be able to adequately suppress the vibrations and noise generated within the car chamber 3.

[0016] For this reason, in the method according to this embodiment, a vibration-damping paint is used instead of the vibration-damping material and sound-absorbing material described above, and the process of cutting the vibration-damping material and sound-absorbing material is omitted. Also, in the method according to this embodiment, the magnitude of vibration and noise occurring in the car chamber 3 is estimated for each location in the car chamber 3, and the thickness of the vibration-damping paint applied to the car chamber 3 is changed according to the estimated magnitude of vibration and noise, thereby suitably suppressing the vibration and noise occurring in the car chamber 3.

[0017] The finite element method is used as a method for estimating the magnitude of vibration and noise at each location in the car room 3. The finite element method is a method for creating an analytical model in which a structure to be analyzed is divided into a finite number of elements (meshes), and analyzing the analytical model. In this embodiment, a vibration analysis is performed on an analytical model of the car room 3 of the passenger car 1 that is composed of a plurality of elements divided based on the above-mentioned finite element method, and the magnitude of vibration and noise at each location in the car room 3 is estimated.

[0018] Fig. 2 is a diagram showing an example of an analytical model M1 created based on the finite element method. The analytical model M1 shown in Fig. 2 is an analytical model corresponding to the floor surface 3a of the car room 3 created based on the finite element method. The analytical model M1 includes 55 elements divided based on the finite element method and 69 nodes corresponding to the vertices of these elements.

[0019] FIG. 3 is a diagram showing an example of a result of a vibration analysis performed using the analysis model M1 shown in FIG. One of the methods for performing vibration analysis using the finite element method is frequency response analysis. Frequency response analysis is an analysis method in which an object to be analyzed is repeatedly vibrated at a specified frequency, and the response when the object to be analyzed reaches a steady state is confirmed. In this embodiment, the frequency response analysis is performed using the above-mentioned analysis model M1, and a response magnification at each node included in the analysis model M1 is calculated.

[0020] Fig. 3 shows the results when frequencies in the frequency range of 28500Hz to 30000Hz are applied to the analysis model M1, and shows the response magnifications at five nodes (nodes P1, P13, P41, P61, and P86) included in the analysis model M1. Note that the vertical axis of the graph in Fig. 3 indicates the response magnification, and the horizontal axis indicates the frequency.

[0021] As shown in Fig. 3, the response magnifications at the five nodes P1, P13, P41, P61, and P86 all reach their maximum value when a frequency of 29,241.5 Hz, one of the dominant frequencies, is applied to the analysis model M1. The response magnification increases as the displacement of the node increases when the analysis model M1 is vibrated. In other words, the closer to the node with the larger the response magnification, the greater the vibration and noise inside the car tend to be.

[0022] Fig. 4 shows an example of the results of vibration analysis using the analysis model M1 shown in Fig. 2, and is a diagram showing maximum values ​​of response magnifications at five nodes P1, P13, P41, P61, and P86 included in the analysis model M1. As shown in Fig. 4, the maximum value of the response magnification at node P1 is 0.8489708, the maximum value of the response magnification at node P13 is 0, the maximum value of the response magnification at node P41 is 0.2063253, the maximum value of the response magnification at node P61 is 0.6645983, and the maximum value of the response magnification at node P86 is 0.6418634.

[0023] As described above, there is a tendency for in-cab vibration and in-cab noise to be greater nearer the node with a larger response magnification, and therefore, according to the results of the frequency response analysis using analytical model M1, it is estimated that the in-cab vibration and in-cab noise are greatest at the location near node P1 on the floor 3a of the car room 3, and that the in-cab vibration and in-cab noise are least at the location near node P13 on the floor 3a of the car room 3.

[0024] In this embodiment, the vibration-damping paint is applied to (the outer surface of) the car room 3 based on the result of the above-mentioned frequency response analysis. For example, the vibration-damping paint is applied to the outer surface of the floor surface 3a corresponding to the portion near the node P1 with a thickness of 0.85 mm based on the response magnification "0.8489708" at the node P1. Furthermore, the vibration-damping paint is not applied to the outer surface of the floor surface 3a corresponding to the portion near the node P13 based on the response magnification "0" at the node P13. Furthermore, the vibration-damping paint is applied to the outer surface of the floor surface 3a corresponding to the portion near the node P41 with a thickness of 0.21 mm based on the response magnification "0.2063253" at the node P41. Similarly, the vibration-damping paint is applied to the outer surface of the floor surface 3a corresponding to the portion near the node P61 with a thickness of 0.66 mm, and the vibration-damping paint is applied to the outer surface of the floor surface 3a corresponding to the portion near the node P86 with a thickness of 0.64 mm.

[0025] The location near each node may be defined as the location of elements located around each node. For example, the location near node P1 may be defined as the location of elements located around node P1, that is, the location of elements surrounded by nodes P1, P2, P4, and P3, the location of elements surrounded by nodes P1, P3, P63, and P62, the location of elements surrounded by nodes P1, P62, and P58, and the location of elements surrounded by nodes P1, P58, P59, and P2.

[0026] In this manner, in this embodiment, based on the results of the above-mentioned frequency response analysis, the damping paint is applied thicker to locations near nodes with larger response magnifications where the vibration and noise inside the car are estimated to be large, and the damping paint is applied thinner to locations near nodes with smaller response magnifications where the vibration and noise inside the car are estimated to be small. This allows the damping paint to be applied in an appropriate thickness to each location in the car room 3, making it possible to appropriately suppress the vibration and noise generated inside the car room 3.

[0027] As described above, in this embodiment, as a method for improving the vibration and noise inside the car 1, a vibration analysis is performed on the analytical model M1 of the floor 3a of the car room 3, which is composed of a plurality of elements divided based on the finite element method, and based on the results of the vibration analysis, a vibration-damping paint is applied to the outer surface of the floor 3a of the car room 3.

[0028] According to this, firstly, by using the vibration-damping paint, it is possible to omit the process of cutting the vibration-damping material and the sound-absorbing material, and the labor required for construction can be reduced. Also, it is possible to estimate the extent of vibration and noise generated at which location on the floor surface 3a of the car room 3, and to vary the thickness of the vibration-damping paint applied to the outer surface of the floor surface 3a of the car room 3 according to the magnitude of the estimated vibration and noise, and it is possible to suitably suppress the vibration and noise generated inside the car room 3.

[0029] Furthermore, since the method according to this embodiment only involves applying vibration-damping paint to the outer surface of the floor 3a of the car chamber 3, there is no need for major structural changes such as complete removal and renewal or partial removal and renewal, and the vibration and noise inside the car 1 can be improved without incurring significant costs.

[0030] In this embodiment, the floor surface 3a of the car room 3 is the analysis target, and a vibration analysis is performed on the analysis model M1 corresponding to the floor surface 3a. However, the present invention is not limited to this, and for example, the side panels, doors (car doors), ceiling surface, etc. of the car room 3 may be the analysis target, and analysis models corresponding to these may be created to perform the vibration analysis. In this case, too, similar to the case where the floor surface 3a of the car room 3 is the analysis target, vibration and noise inside the car of the passenger car 1 can be suitably suppressed by applying a vibration-damping paint to the outer surface of the analysis target based on the results of the vibration analysis.

[0031] In this embodiment, the analytical model M1 of the floor 3a of the cart 3 includes 55 elements divided based on the finite element method and 69 nodes corresponding to the vertices of these elements, but the present invention is not limited to this, and the number of elements and the number of nodes included in the analytical model M1 can be set to any value. By increasing the number of elements and the number of nodes included in the analytical model M1, it is possible to perform vibration analysis with higher accuracy.

[0032] Furthermore, in this embodiment, a case has been described in which vibration-damping paint is applied to locations near each node with a thickness approximately equal to the response magnification at each node, but this is not limited to this. For example, vibration-damping paint may be applied to locations near each node with a thickness of n times or 1 / n times (n is any natural number) the response magnification at each node.

[0033] Alternatively, the vibration-damping paint may be applied to the area near each node with a thickness based on the ratio of the response magnifications at each node. Specifically, in this embodiment, the vibration-damping paint is applied to the area near the node P1 with a thickness of 0.85 mm based on the response magnification "0.8489708" at the node P1, and the vibration-damping paint is applied to the area near the node P41 with a thickness of 0.21 mm based on the response magnification "0.2063253" at the node P41, but this is not limited thereto, and since the ratio between the response magnification "0.8489708" at the node P1 and the response magnification "0.2063253" at the node P41 is approximately "4:1", for example, the vibration-damping paint may be applied to the area near the node P1 with a thickness of 4 mm, and the vibration-damping paint may be applied to the area near the node P41 with a thickness of 1 mm.

[0034] In the embodiment described above, the case has been described where the car 1 is a car of a freight elevator with low performance requirements for vibration and noise inside the car, but the present invention is not limited to this. For example, if the car 1 is a car of an older model elevator or the like that does not have a sufficient vibration-proof structure, the method according to this embodiment can be applied to improve the vibration and noise inside the car, whether it is an existing car or a newly built car.

[0035] According to the embodiment described above, it is possible to provide an elevator and a method capable of improving vibration and noise inside the car without incurring a large amount of cost in an elevator that does not have a sufficient vibration-proof structure.

[0036] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0037] 1...car, 2...car frame, 3...cage room, 3a...floor, 4...upper beam, 5...lower beam, 6...vertical frame, M1...analysis model.

Claims

1. The vehicle has a car to which a vibration-damping paint is applied based on the results of a vibration analysis performed on an analytical model of the car composed of a plurality of elements divided based on the finite element method, The vibration-damping paint is applied to the car based on a response magnification at each node of the plurality of elements obtained as a result of the vibration analysis, An elevator characterized in that, when a first node among the nodes of the multiple elements indicates a first response magnification, and a second node different from the first node indicates a second response magnification smaller than the first response magnification, the vibration-damping paint is applied thicker at a first location of the car corresponding to the first node than at a second location of the car corresponding to the second node.

2. The elevator according to claim 1, characterized in that the analytical model of the car includes at least one of an analytical model of a floor surface of the car, an analytical model of a side panel of the car, an analytical model of a door of the car, or an analytical model of a ceiling surface of the car.

3. Creating an analytical model of a car composed of a plurality of elements divided based on a finite element method; performing a vibration analysis on the analytical model; applying a vibration-damping paint to the car based on a response magnification at each node of the plurality of elements obtained as a result of the vibration analysis; Equipped with A method in which, when a first node among the nodes of the plurality of elements indicates a first response magnification, and a second node different from the first node indicates a second response magnification smaller than the first response magnification, the vibration-damping paint is applied thicker to a first location of the car corresponding to the first node than to a second location of the car corresponding to the second node.

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