WO2018033656A1 - Dispositif non intrusif et procédé de détection de la cavitation dans un navire - Google Patents

Dispositif non intrusif et procédé de détection de la cavitation dans un navire Download PDF

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Publication number
WO2018033656A1
WO2018033656A1 PCT/ES2017/070580 ES2017070580W WO2018033656A1 WO 2018033656 A1 WO2018033656 A1 WO 2018033656A1 ES 2017070580 W ES2017070580 W ES 2017070580W WO 2018033656 A1 WO2018033656 A1 WO 2018033656A1
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WO
WIPO (PCT)
Prior art keywords
signal
ship
propeller
cavitation
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/ES2017/070580
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English (en)
Spanish (es)
Inventor
Publio Beltrán Palomo
Alfonso Moreno Rodríguez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tecnicas Y Servicios De Ingenieria Sl
Original Assignee
Tecnicas Y Servicios De Ingenieria Sl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tecnicas Y Servicios De Ingenieria Sl filed Critical Tecnicas Y Servicios De Ingenieria Sl
Publication of WO2018033656A1 publication Critical patent/WO2018033656A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/08—Analysing frequencies present in complex vibrations, e.g. comparing harmonics present
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B71/00—Designing vessels; Predicting their performance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation

Definitions

  • the object of the present invention is a non-intrusive device and an automatic cavitation detection method in a ship, wherein said cavitation is produced by a ship's propeller or the hull-helix interaction thereof.
  • Cavitation is the main cause of erosion on the propellers and on the rudders of the ships. Cavitation is also one of the most important sources of noise radiated by the ship to the water, as well as the main one! generator of noise and / or vibration on board the ship.
  • cavitation causes a significant loss of energy efficiency of the ship's propulsion system with its corresponding negative economic impact on the operation of the ship.
  • a first aspect of the invention is a non-intrusive device for detecting the appearance of cavitation in a ship, wherein the ship comprises:
  • a propulsion unit which in turn comprises at least one propulsion engine, a transmission system and at least one propeller with a plurality of blades, wherein the propulsion engine and the propeller are linked to each other by the transmission system,
  • the device comprises:
  • At least one accelerometer intended to be installed inside the hull of the ship at an intersection of at least two primary elements of the case structure in the area near the propeller, to detect a first signal comprising vibrations in the hull and that when there is cavitation it is modulated by the frequency of pitch of the propeller blade,
  • control unit linked with accelerometer and with said connector, which in turn comprises:
  • acquisition means intended to acquire the first signal and to acquire the frequency from the tachometer or the ship's navigation system turn of! propulsion engine to determine the pitch of the propeller blade
  • - high frequency filtering means intended to filter the first signal to obtain a second signal comprising the high frequency components, between 1 kHz and 20 kHz, of the first signal
  • - signal processing means intended to calculate the envelope of the second signal by applying the Hilbert transform and subsequently performing its complex sum with the second signal, obtaining a third signal that is complex and whose module is the envelope of the second signal,
  • the device comprises three accelerometers intended to be installed in the junction areas of the primary elements of the hull structure.
  • the high frequency filtering means filter the first signal at frequencies between 8 kHz and 10 kHz.
  • the control unit through the ship's navigation system records at least some operating conditions of the ship in particular, a ship speed, the propeller pitch and a power developed by the engine. These ship operating conditions are used in determining the limit value that determines the appearance of cavitation and the alarm signal. These navigation conditions allow the user to be informed of the conditions in which there is an alarm in the cavitation signal.
  • these conditions of operation of the vessel allow to know the condition of non-cavitation of the vessel in navigation. Specifically, by means of a correlation between the fourth signal and the ship's speed, to adjust the specific limit value of the cavitation detection method obtained for each ship.
  • a second aspect of the invention is a non-intrusive method of detecting cavitation comprising:
  • the high frequency filtering means apply a filter to the first signal, by means of the high frequency filtering means, to obtain the second signal comprising the high frequency components, between 1 KHz and 20 kHz, of the first signal,
  • the fourth signal which collects in the time domain the value of the intensity of the spectrum component at the blade pitch frequency, - set at least a limit of amplitude of the intensity of the fourth signal at the frequency of specific blade pitch for the vessel that when it is passed indicates the appearance of cavitation produced by the propeller,
  • the high frequency filtering means filter the first signal at frequencies between 8 kHz and 10 kHz. DESCRIPTION OF THE DRAWINGS
  • Figure 1 Shows a schematic view of the connection between the elements of a preferred embodiment of the non-intrusive device for detecting cavitation in the vessel.
  • Figure 2. Shows an overview of a spectrogram of the third signal.
  • Figure 3. Shows a general view of the fourth signal where the cavitation phenomenon appears.
  • a preferred embodiment, tai and as shown in Figure 1, is a non-intrusive device (1) for detecting cavitation in a ship, not shown, wherein the ship comprises:
  • a propulsion unit which in turn comprises a propulsion engine coupled to a tachometer, a transmission system and a propeller with three blades, wherein the propulsion engine and the propeller are linked to each other by the transmission system.
  • This vessel without limitation, has undergone a test at sea where engine revolutions have increased to produce cavitation in the propeller. More specifically, the device (1 ⁇ comprises:
  • a connector intended to be linked to the tachometer (3), a control unit (4), linked with the accelerometers (2) and with said connection, to detect cavitation, and
  • an interface (5) linked to the control unit (4), intended to notify the appearance of cavitation to a user and navigation conditions, as well as a visual alarm that is activated when the cavitation phenomenon appears.
  • the device (1) comprises a connection intended to link the control unit (4) with a ship navigation system so that the control unit (4) records the ship's operating conditions
  • These operating conditions of the ship include information about the speed of the ship, the pitch of the propeller and the power developed by the engine.
  • control unit (4) executes an algorithm comprising a non-intrusive method to detect cavitation comprising: acquiring, by means of accelerometers (2), the first signal relative to vibrations modulated by the blade pitch frequency of the propeller when there is cavitation,
  • a fourth signal from the series of spectra, comprising the historical series of intensities of the spectral component at the frequency of the blade pitch for each spectrum, specifically, when the propeller does not cavitate the fourth sign! it would be equivalent to a "white noise" with a constant variance.
  • the fourth signal changes and its amplitude increases depending on the speed of rotation of the propeller, that is, on the basis of! cavitation volume This phenomenon is shown in figure 2, where the spectrogram of the third signal is represented, where initially (region i), at low speed of rotation of the helix and in a non-cavitation regime.
  • an algorithm determines the specific limits for each vessel.
  • the algorithm comprises a previous learning phase to detect the "white noise” and establish the characteristics of the fourth signal (mean and variance). More specifically, when the propeller does not cavitate the fourth signal is a white noise that does not depend on the ship's speed. This is detected by the correlation between the fourth signal and the ship's speed when it is statistically zero, and from the mean and variance of the fourth signal the control limit is established.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

La présente invention concerne un dispositif non intrusif et un procédé de détection automatique de la cavitation dans un navire, laquelle cavitation est produite par une hélice du navire ou par l'interaction coque-hélice dudit navire. Plus concrètement, ce dispositif non intrusif comprend au moins un accéléromètre destiné à être installé à l'intérieur de la coque du navire à une intersection d'au moins deux éléments primaires de la structure de la coque dans la zone proche de l'hélice, un élément de branchement prévu pour être raccordé au tachymètre du navire, une unité de commande destinée à recevoir des informations de l'accéléromètre et du tachymètre pour détecter la cavitation et le notifier à l'utilisateur par l'intermédiaire d'une interface.
PCT/ES2017/070580 2016-08-16 2017-08-11 Dispositif non intrusif et procédé de détection de la cavitation dans un navire Ceased WO2018033656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201631097A ES2615809B1 (es) 2016-08-16 2016-08-16 Dispositivo no intrusivo y método para detectar cavitación en un buque
ESP201631097 2016-08-16

Publications (1)

Publication Number Publication Date
WO2018033656A1 true WO2018033656A1 (fr) 2018-02-22

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PCT/ES2017/070580 Ceased WO2018033656A1 (fr) 2016-08-16 2017-08-11 Dispositif non intrusif et procédé de détection de la cavitation dans un navire

Country Status (2)

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ES (1) ES2615809B1 (fr)
WO (1) WO2018033656A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021038594A1 (fr) * 2019-08-28 2021-03-04 Chairman, Defence Research & Development Organisation (DRDO) Hélice marine
RU2791969C1 (ru) * 2019-08-28 2023-03-15 ЧЕАМЭН, ДИФЭНС РИСЁЧ & ДЕВЕЛОМПМЕНТ ОРГАНИЗЕЙШН (ДиАрДиО) Судовой гребной винт

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* Cited by examiner, † Cited by third party
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CN111169607B (zh) * 2020-01-09 2021-10-26 哈尔滨工程大学 一种用于水下航行器辐射噪声测量的循环混响水池
JP2023112800A (ja) * 2022-02-02 2023-08-15 ヤマハ発動機株式会社 ジェット推進艇

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US20020185046A1 (en) * 2001-06-11 2002-12-12 Motsenbocker Marvin A. Monitoring and control of watercraft propulsion efficiency
EP2634084A1 (fr) * 2012-02-29 2013-09-04 ABB Oy Agencement et procédé pour navire
EP2805175A1 (fr) * 2012-01-17 2014-11-26 ATLAS Elektronik GmbH Procédé et dispositif destinés à traiter des signaux sonores se propageant dans l'eau

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CN102252748B (zh) * 2011-04-08 2012-12-05 东南大学 基于经验模态的空化噪声调制特征提取方法
CN103412298B (zh) * 2013-08-12 2017-11-14 中国兵器科学研究院 一种自动获取船舶螺旋桨变速旋转时间区间方法

Patent Citations (3)

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US20020185046A1 (en) * 2001-06-11 2002-12-12 Motsenbocker Marvin A. Monitoring and control of watercraft propulsion efficiency
EP2805175A1 (fr) * 2012-01-17 2014-11-26 ATLAS Elektronik GmbH Procédé et dispositif destinés à traiter des signaux sonores se propageant dans l'eau
EP2634084A1 (fr) * 2012-02-29 2013-09-04 ABB Oy Agencement et procédé pour navire

Non-Patent Citations (2)

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Title
D. HANSON, J. ANTONI, G. BROWN, R. EMSLIE: "Cyclostationarity for passive underwater detection of prolellor craft: a development of DEMON processing", PROCEEDINGS OF ACOUSTICS 2008, 24 November 2008 (2008-11-24), Geelong, Australia, XP055056778, Retrieved from the Internet <URL:http://www.acoustics.asn.au/conference_proceedings/AAS2008/papers/p63.pdf> [retrieved on 20130315] *
JEUNG-HOON LEE ET AL: "Application of signal processing techniques to the detection of tip vortex cavitation noise in marine propeller", JOURNAL OF HYDRODYNAMICS, vol. 25, no. 3, 1 July 2013 (2013-07-01), CN, pages 440 - 449, XP055428877, ISSN: 1001-6058, DOI: 10.1016/S1001-6058(11)60383-2 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021038594A1 (fr) * 2019-08-28 2021-03-04 Chairman, Defence Research & Development Organisation (DRDO) Hélice marine
KR20220047877A (ko) * 2019-08-28 2022-04-19 체어맨, 디펜스 리서치 앤드 디벨롭먼트 올거니제이션 (디알디오) 선박용 프로펠러
RU2791969C1 (ru) * 2019-08-28 2023-03-15 ЧЕАМЭН, ДИФЭНС РИСЁЧ & ДЕВЕЛОМПМЕНТ ОРГАНИЗЕЙШН (ДиАрДиО) Судовой гребной винт
KR102773899B1 (ko) * 2019-08-28 2025-02-26 체어맨, 디펜스 리서치 앤드 디벨롭먼트 올거니제이션 (디 알디오) 선박용 프로펠러

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Publication number Publication date
ES2615809B1 (es) 2018-03-14
ES2615809A1 (es) 2017-06-08

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