Title:
MEASUREMENT METHOD, OBSERVATION DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2023/176601
Kind Code:
A1
Abstract:
A measurement method for measuring a state of a device in which components are lubricated with a lubricant, the method comprising: applying an alternating voltage to an electric circuit including the components to be lubricated with the lubricant; measuring the impedance and phase angle of the electric circuit when the alternating voltage is applied; and deriving an oil film thickness and a metallic contact ratio between the components on the basis of the impedance and the phase angle, wherein the oil film thickness and the metallic contact ratio between the components are derived by using a formula that defines the capacitance of a contact area between the components, according to the probability density function of surface roughness between the components in the contact area.
Inventors:
AIKAWA FUMIAKI (JP)
MARUYAMA TAISUKE (JP)
ENAMI KAKERU (JP)
MARUYAMA TAISUKE (JP)
ENAMI KAKERU (JP)
Application Number:
PCT/JP2023/008683
Publication Date:
September 21, 2023
Filing Date:
March 07, 2023
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
G01M13/04; F16C19/52; G01N27/02
Foreign References:
| JP2019211317A | 2019-12-12 | |||
| JP2020193968A | 2020-12-03 | |||
| JP2018180004A | 2018-11-15 | |||
| US20200142392A1 | 2020-05-07 | |||
| CN109002610A | 2018-12-14 |
Other References:
MARUYAMA TAISUKE, NAKANO KEN: "In Situ Quantification of Oil Film Formation and Breakdown in EHD Contacts", TRIBOLOGY TRANSACTIONS, THE SOCIETY, PARK RIDGE, IL,, US, vol. 61, no. 6, 2 November 2018 (2018-11-02), US , pages 1057 - 1066, XP055884681, ISSN: 1040-2004, DOI: 10.1080/10402004.2018.1468519
Attorney, Agent or Firm:
EIKOH, P.C. (JP)
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