公开(公告)号：US20200032753A1

公开(公告)日：2020-01-30

申请号：US16044839

申请日：2018-07-25

Applicant: HITACHI, LTD.

Inventor： Qifan HE ,  Akira INOUE

IPC: F02M59/46 ,  H01F7/08 ,  F02M63/00

Abstract: In some examples, a static part includes a static body and a first cylindrical extension extending from the static body, the first cylindrical extension including an open end with a cylindrical inner surface having a first diameter. A moveable part is moveable toward the static part by the magnetic flux of a solenoid. The moveable part may include a moveable body and a second cylindrical extension extending from the moveable body, the second cylindrical extension including a cylindrical outer surface having a second diameter, smaller than the first diameter, to enable the cylindrical outer surface to move within the open end. The second diameter is sized for the cylindrical outer surface to pass adjacent to the cylindrical inner surface to enable passage of a portion of the magnetic flux radially to reduce an energy of impact between the moveable part and the static part.

公开(公告)号：US20240264045A1

公开(公告)日：2024-08-08

申请号：US18105588

申请日：2023-02-03

Applicant: Hitachi, Ltd.

Inventor： Akira INOUE

IPC: G01M99/00 ,  H04R3/00

CPC classification number: G01M99/005 ,  H04R3/00

Abstract: In example implementations described herein, there are systems and methods for performing predictive maintenance which can include collecting vibration data related to an operation of a first machine during a first time period, computing sound data related to the operation of the first machine during the first time period based on the collected vibration data, and predicting, based on the computed sound data, at least one value associated with a maintenance of the first machine. In some aspects, the systems and methods may further include measuring an acoustic transfer function relating the vibration data related to the operation of the first machine to one or more of the sound pressure data or the particle velocity data.