Title:
BUBBLE GENERATION DETECTOR AND BUBBLE GENERATION DETECTING METHOD
Document Type and Number:
Japanese Patent JP2018192816
Kind Code:
A
Abstract:
To provide a bubble generation detector and its method capable of observing a bubble generation from the control signal and state signal of a drive system, and which improve propulsion efficiency.SOLUTION: It has a stage to drive a screw motor 10 by a constant torque, a stage to calculate the average of torque constant Kq from the measured value of torque and rotational speed in the constant torque region and in state without bubble generation, a stage to calculate a reference rotational speed based on the relational expression of torque and number of revolution by using the average value of torque constant Kq calculated, and a stage to determine the bubble generation when its difference becomes greater than the predetermined value after comparing the reference rotational speed with the actual rotational speed.SELECTED DRAWING: Figure 2
Inventors:
OIDE TAKESHI
TAKAMASA KANJI
SHIMIZU ETSURO
HATSUKU TATSUYA
IHARA TOMONORI
TAKAMASA KANJI
SHIMIZU ETSURO
HATSUKU TATSUYA
IHARA TOMONORI
Application Number:
JP2017095263A
Publication Date:
December 06, 2018
Filing Date:
May 12, 2017
Export Citation:
Assignee:
UNIV TOKYO MARINE SCI & TECH
International Classes:
B63H5/07; B63B9/00; B63H21/17; B63H21/20; B63H21/21; H02P29/024
Domestic Patent References:
| JPH10138997A | 1998-05-26 | |||
| JPS60160297U | 1985-10-24 | |||
| JP2013085330A | 2013-05-09 | |||
| JP2012100409A | 2012-05-24 | |||
| JP2011020579A | 2011-02-03 | |||
| JP2012208083A | 2012-10-25 |
Foreign References:
| US20160368388A1 | 2016-12-22 | |||
| CN103387043A | 2013-11-13 |
Other References:
大出剛，賞雅寛而，波津久達也，井原智則: "“トルク一定制御モータ推進システムにおけるプロペラ周囲気泡とスラスト変動の特性評価”", 日本マリンエンジニアリング学会誌, vol. 第53巻第4号, JPN6021005887, 2018, pages 111 - 116, ISSN: 0004450914
Attorney, Agent or Firm:
Katsunuma International Patent Office