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JP-2026074615-A - Measurement system, measurement method, and jig

JP2026074615AJP 2026074615 AJP2026074615 AJP 2026074615AJP-2026074615-A

Abstract

[Problem] To provide a measurement system for acquiring the resonant frequency of a wheel. [Solution] The measurement system comprises a jig 50 having a support shaft 52 that fixes the wheel 5 so that it cannot be displaced, an excitation block 60 fixed to the outer surface of the wheel 5, a hammer device 30 having a hammer body 32 that excites the excitation block 60 in a left-right direction parallel to the central axis of the wheel 5, and a first sensor 31 for detecting the excitation by the hammer body 32, a second sensor 22 attached to the support shaft 52 for detecting one or both of the vibration components around the axis in a direction perpendicular to the left-right direction and the vibration components in the left-right direction, and a calculation unit 15 that performs calculation processing to obtain one or both of the lateral bending primary resonance frequency and the left-right translation resonance frequency of the wheel 5 based on the signals from the first sensor 31 and the second sensor 22. [Selection Diagram] Figure 6

Inventors

  • ▲高▼田 翔士

Assignees

  • 住友ゴム工業株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (7)

  1. A measurement system for obtaining the resonant frequency of a wheel, A jig having a support shaft that fixes the wheel in a position where it cannot be displaced, A vibration-generating block fixed to the outer surface of the wheel, A hammer device having a hammer body that vibrates the vibration-generating block in a left-right direction parallel to the central axis of the wheel, and a first sensor for detecting the vibration by the hammer body, A second sensor is attached to the support shaft and is used to detect vibration components around an axis perpendicular to the left-right direction, and one or both of the vibration components in the left-right direction. A calculation unit that performs calculation processing to acquire one or both of the lateral bending primary resonant frequency and the left-right translational resonant frequency of the wheel based on the signal from the first sensor and the signal from the second sensor, A measurement system having the following features.
  2. The second sensor is a sensor for detecting both the vibration component around the axis in a direction perpendicular to the left-right direction and the vibration component in the left-right direction. The calculation unit performs calculation processing to obtain both the lateral bending primary resonance frequency and the left-right translational resonance frequency of the wheel. The measurement system according to claim 1.
  3. The support shaft has a fixing portion that fixes the wheel in a manner that prevents displacement in the direction of the three orthogonal axes, including the axial direction of the support shaft which is the left-right direction, and in the rotational direction around the three orthogonal axes. The measurement system according to claim 1 or claim 2.
  4. The calculation unit performs the calculation process as follows: A process for obtaining a transfer function based on the signal from the first sensor and the signal from the second sensor, A process to output the peak value of the frequency analysis result of the transfer function, A measurement system according to claim 1 or claim 2, which performs the following:
  5. A measurement method for obtaining the resonant frequency of a wheel, A preparatory step of fixing the wheel to the support shaft in a way that prevents displacement, A vibration step is performed by using a hammer device to vibrate a vibration block fixed to the outer surface of the wheel in a left-right direction parallel to the central axis of the wheel. A first acquisition step involves acquiring the vibration of the hammer device during the excitation of the vibration-generating block as an input signal, A second acquisition step involves acquiring, as an output signal, one or both of the vibration components around the axis in a direction perpendicular to the left-right direction and the vibration components in the left-right direction, which are caused by the excitation of the hammer device. A measurement step of obtaining one or both of the lateral bending primary resonance frequency and the left-right translational resonance frequency of the wheel from a transfer function based on the input signal and the output signal, A measurement method having the following characteristics.
  6. A jig used to obtain one or both of the lateral bending primary resonance frequency and the left-right translational resonance frequency of a wheel, A high-rigidity support block fixed to the base, A support shaft extending from the aforementioned high-rigidity support block and fixed to the aforementioned high-rigidity support block in a manner that prevents displacement, It has, The aforementioned support shaft is A fixing part that fixes the wheel so that it cannot be displaced in the direction of the three orthogonal axes including the axial direction of the support shaft which is in the left-right direction, and in the rotational direction around the three orthogonal axes, A mounting section for attaching a sensor that acquires vibrations acting on the support shaft, A jig having
  7. The fixing part has a configuration for fixing the wheel such that the central axis of the support shaft, which has a circular cross-section, and the central axis of the wheel are coaxial. The mounting portion mounts the four sensors at equal intervals along the circumferential direction centered on the central axis of the support shaft. The jig according to claim 6.

Description

This invention relates to a measurement system for acquiring the resonant frequency of a wheel, a measurement method performed by the measurement system, and a jig used in the measurement system and the measurement method. In automobiles, if the resonant frequency of a wheel is close to the resonant frequency of other devices installed around it (e.g., steering system components), problems such as the generation of abnormal noise can occur. Therefore, in wheel development, a method for detecting vibrations and evaluating their characteristics has been proposed, for example, the method disclosed in Patent Document 1. Japanese Patent Publication No. 2020-38158 This is a diagram to explain wheel resonance.This is a diagram to explain wheel resonance.This is a schematic diagram of a jig used in a measurement system.This is a schematic diagram of a jig used in a measurement system.Figures 3 and 4 are explanatory diagrams showing a tire supported by the jigs shown, viewed from a direction along the central axis.This is an explanatory diagram showing the configuration of the measurement system.This is a flowchart of a measurement method for obtaining the resonant frequency of a tire.This is an explanatory diagram showing the output obtained by wavenumber analysis. [Details of Embodiments of the Present Invention] The present invention will now be described in detail, with reference to the drawings, based on preferred embodiments. [Regarding the resonant frequency of the wheel] Wheel resonances include primary lateral bending resonance and lateral translational resonance. Figures 1 and 2 illustrate wheel resonances. In the following embodiments, a wheel 5 in which a pneumatic tire 7 is mounted on a rim 6 will be described. As will be explained later, the wheel may also be an airless tire. The tire 7 is made of rubber and is supported by a metal rim 6. The central axis C1 of the tire 7 coincides with the central axis of the rim 6. In the following explanation, the direction along the central axis C1 of the tire 7 (wheel 5), and the direction parallel to the central axis C1, are defined as the "left-right direction." The direction along a virtual circle centered on the central axis C1 is defined as the "circumferential direction." Assuming that the wheel 5 is mounted on the body of a vehicle (automobile) and rolls, the direction perpendicular to the left-right direction, and in which the vehicle moves linearly forward and backward, is defined as the "forward-backward direction" of the tire 7 (wheel 5). The direction that is perpendicular to both the left-right and front-back directions is defined as the "up-down direction." Figure 1 shows the vibration modes of the first lateral bending resonance. The first lateral bending resonance is a resonance that occurs when the tread 71 vibrates in a manner in which it undergoes rigid motion around a vertical axis (X-axis). When the excitation position relative to the wheel 5 is, for example, the rear position of the wheel 5, and the excitation direction has a component in the left-right direction, the axis relating to the direction of vibration caused by that excitation becomes the "vertical axis". Since the first lateral bending resonance is a vibration around the vertical axis, the axis relating to the direction of that vibration is called the "vertical rotation axis". In other words, the first lateral bending resonance occurs in a vibration mode in which the tread 71 moves around the vertical rotation axis (around the X-axis). The primary resonance frequency for lateral bending is the resonance frequency when the tire 7 vibrates around its vertical rotation axis. Figure 2 shows the vibration modes of lateral translational resonance. Lateral translational resonance is a resonance that occurs when the tread 71 vibrates in a manner in which it undergoes rigid motion in the tire width direction. The tire width direction is the left-right direction and is parallel to the central axis C1. The axis relating to the direction of this vibration is the "left-right axis (also called the left-right axis)". Lateral translational resonance occurs in a vibration mode in which the tread 71 moves in a direction along the Z-axis, which is the left-right axis. The left-right translational resonance frequency is the resonance frequency when the tire 7 vibrates along the left-right axis. In this embodiment, with respect to lateral translational resonance, the excitation position relative to the wheel 5 is the rear position of the wheel 5, and the excitation direction has a lateral component. The excitation position and excitation direction are the same as in the case of lateral bending primary resonance. In other words, by keeping both the excitation position and excitation direction the same, it is possible to simultaneously generate both lateral bending primary resonance and lateral translational resonance vibration modes. Regarding the first-order lateral bending resonance, the excitation po