ABNORMAL NOISE INSPECTION METHOD FOR ANTI-VIBRATION DEVICE FOR VEHICLE USE

• US 20080262672A1
• Filed: 03/07/2008
• Published: 10/23/2008
• Est. Priority Date: 04/17/2007
• Status: Active Grant

• Current Assignee: Kurashiki Kako Co., Ltd. (Mazda Motor Corporation)
• Original Assignee: Kurashiki Kako Co., Ltd. (Mazda Motor Corporation)
• Inventors: KATAYAMA, Minoru, MORIYA, Takashi, MIYAKE, Tetsuya, FUJINAMI, Yoshinori, OHTA, Katsutoshi
• Granted Patent: US 8,214,104 B2
• Time in Patent Office: Days
• US Class Current: 701/29
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G01M 17/04 Suspension or damping
• CPC Class Codes: G01M 7/025 Measuring arrangements
• CPC Class Codes: G01M 7/04 Monodirectional test stands

Abstract

In an abnormal noise inspection method for a anti-vibration device for vehicle use, it is determined whether, during travel of a vehicle in which a supported member is supported to the vehicle body by an anti-vibration device, abnormal noise occurs or not in the passenger compartment owing to the anti-vibration device. The method includes: an input step of mounting to a shaker the anti-vibration device before assembled into the vehicle and then inputting vibrations in a predetermined pattern to a supported member-side mounting part of the anti-vibration device; a measurement step of measuring, during the inputting of vibrations, a transmission force output from a vehicle body-side mounting part of the anti-vibration device; an analysis step of frequency analyzing time-series data on the measured transmission force to obtain the power spectrum of the transmission force; and a determination step of estimating, based on the power spectrum of the transmission force and according to a predetermined evaluation criterion, whether a vehicle produces abnormal noise in the passenger compartment when it runs with the anti-vibration device mounted thereon.

Claims

1. An abnormal noise inspection method for an anti-vibration device for vehicle use, the method comprising:

an input step of mounting to a shaker an anti-vibration device including a vehicle body-side mounting part to be connected to a vehicle body and a supported member-side mounting part to be connected to a supported member and then inputting vibrations in a predetermined pattern to the supported member-side mounting part of the anti-vibration device;

a measurement step of measuring, during the inputting of vibrations, a transmission force output from the vehicle body-side mounting part of the anti-vibration device;

an analysis step of frequency analyzing time-series data on the measured transmission force to obtain the power spectrum of the transmission force; and

a determination step of estimating, based on the power spectrum of the transmission force and according to a predetermined evaluation criterion, whether a vehicle produces abnormal noise in the passenger compartment owing to the anti-vibration device when the vehicle runs with the anti-vibration device mounted thereon.

2. The abnormal noise inspection method of claim 1, wherein

in the analysis step the power spectrum of the transmission force is used to calculate the overall power in a particular frequency interval including the frequency of abnormal noise to be produced in the passenger compartment, and

in the determination step whether abnormal noise occurs or not in the passenger compartment is estimated based on whether the calculated overall power is above a predetermined evaluation threshold.

3. The abnormal noise inspection method of claim 2, wherein in the input step sine-wave vibrations of constant amplitude and constant frequency are input to the supported member-side mounting part of the anti-vibration device.

4. The abnormal noise inspection method of claim 1, wherein

in the analysis step the power spectrum of the transmission force is subjected to a peak hold processing and the power spectrum after subjected to the peak hold processing is used to calculate the overall power in the particular frequency interval including the frequency of abnormal noise to be produced in the passenger compartment, and

in the determination step whether abnormal noise occurs or not in the passenger compartment is estimated based on whether the calculated overall power is above the predetermined evaluation threshold.

5. The abnormal noise inspection method of claim 4, wherein in the input step sine-wave vibrations of constant amplitude of which frequency is swept over a predetermined range are input to the supported member-side mounting part of the anti-vibration device.