MUMBAI, India, Nov. 21 -- Intellectual Property India has published a patent application (202517097993 A) filed by Mitsubishi Heavy Industries, Ltd., Tokyo, on Oct. 10, for 'rubbing determination device for rotary machine, and rubbing determination method.'
Inventor(s) include Kumagai, Satoshi; Imai, Yuta; Takeda, Hiroki; Yamashita, Masahiko; and Tanaka, Yoshinori.
The application for the patent was published on Nov. 21, under issue no. 47/2025.
According to the abstract released by the Intellectual Property India: "This rubbing determination device is for determining rubbing in a rotary machine having a rotation part rotatably supported with respect to a stationary part by a bearing. The device acquires an AE signal from an AE sensor attached to the stationary part. A maximum value and a minimum value of an envelope obtained by performing envelope processing on the temporal change of the AE signal are identified by signal analysis of the AE signal, and a first frequency spectrum corresponding to a first time zone including the maximum value in the temporal change, a second frequency spectrum corresponding to a second time zone including the minimum value in the temporal change, and an average spectrum of the first frequency spectrum and the second frequency spectrum are calculated. A first signal intensity ratio is calculated as a ratio of the signal intensity in a frequency band higher than a reference frequency in the first frequency spectrum with respect to the ratio of the signal intensity in the entire frequency band of the average spectrum. A second signal intensity ratio is calculated as a ratio of the signal intensity in a frequency band higher than the reference frequency in the second frequency spectrum with respect to the ratio of the signal intensity in the entire frequency band of the average spectrum. A first index is calculated as a ratio of the first signal intensity ratio to the second signal intensity ratio. The presence or absence of rubbing is determined on the basis of the first index."
The patent application was internationally filed on Feb. 27, 2024, under International application No.PCT/JP2024/006902.
Disclaimer: Curated by HT Syndication.
