KR20100008497A - Method and apparatus for controlling ship vibration induced by pressure fluctuation of propeller - Google Patents

Method and apparatus for controlling ship vibration induced by pressure fluctuation of propeller Download PDF

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Publication number
KR20100008497A
KR20100008497A KR1020080069014A KR20080069014A KR20100008497A KR 20100008497 A KR20100008497 A KR 20100008497A KR 1020080069014 A KR1020080069014 A KR 1020080069014A KR 20080069014 A KR20080069014 A KR 20080069014A KR 20100008497 A KR20100008497 A KR 20100008497A
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KR
South Korea
Prior art keywords
pressure
ship
fluctuation
propeller
propulsion engine
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Application number
KR1020080069014A
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Korean (ko)
Inventor
정재권
Original Assignee
삼성중공업 주식회사
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Priority to KR1020080069014A priority Critical patent/KR20100008497A/en
Publication of KR20100008497A publication Critical patent/KR20100008497A/en

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    • 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
    • B63H1/15—Propellers having vibration damping means

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

PURPOSE: A ship vibration control device by the pressure fluctuation of a propeller and a method thereof are provided to control the inside pressure of a ship by corresponding to the pressure fluctuation of a propeller for a ship. CONSTITUTION: A pressure sensor(102) measures the pressure fluctuation of the surface of a ship(1) according to the driving of a propeller(2) of a ship. Air chambers(108,110) are mounted in the ship to be opposite to the pressure sensor. An actuator(106) opens/closes the air chamber for the flow of air. A controller(104) controls the opening/closing of the actuator to control the pressure of the air chamber so that the air chamber has the appropriate pressure according to the pressure measured by the pressure sensor. A position information detector(100) scans the initial position of the propeller. The position information corresponded to the scan result is applied to the controller.

Description

Vessel vibration control device and method according to propulsion pressure of propeller TECHNICAL TECHNICAL FIELD OF METHOD AND METHOD OF APPARATUS FOR CONTROLLING SHIP VIBRATION INDUCED BY PRESSURE FLUCTUATION OF PROPELLER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling vibration of a hull structure caused by a change in pressure of a ship, and in particular, to actively cope with a pressure fluctuation generated by a propulsion engine such as a propeller of a ship occurring during operation of a ship. The present invention relates to a vibration control apparatus and method of a ship.

Figure 1 illustrates the propulsion engine portion of a typical ship.

As illustrated in FIG. 1, a propulsion engine 2 such as a propeller is mounted in a stern direction of the ship 1, and forward thrust is generated by the propulsion engine 2 so that the ship 1 operates. do.

However, since the propulsion engine 2 rotates at a high speed in the wake field of the stern of the ship 1 at the time of operation of the ship 1, the propulsion engine 2 has a cavity in the wing of the propulsion engine 2. Phenomenon may occur.

Cavity refers to a phenomenon in which the pressure around the wing is lower than the saturated underwater pressure when the propeller rotates, resulting in evaporation of fluid (sea water). It changes according to the position of the wing, and the process of creating and disappearing cavities is repeated. The pressure fluctuation (pressure wave) around the propeller caused by this cause is called pressure fluctuation, and this fluctuation pressure propagates to the stern hull of the ship and plays a decisive role in raising the vibration level of the ship.

2A and 2B are graphs illustrating these fluctuation pressures, and FIG. 2A illustrates the general characteristics of the fluctuation pressure signals generated in a tank ship or a LNG natural gas ship as a change with time. FIG. 2B illustrates a change in the change pressure generated in a container ship.

As can be seen in Figures 2a and 2b, the change in the fluctuation pressure with time changes very rapidly in conjunction with the rotation of the propeller blades and is very complicatedly related to the reflux distribution due to linearity, the shape of the propeller, and the propeller rotation speed. The characteristics will change. In addition, since the distribution of the return flow flowing into the propeller is not exactly the same every hour when the ship is in actual operation, it is common to change the shape of the variable pressure signal little by little due to the change in the generation characteristics of the cavity at every revolution of the propeller.

However, it should be noted here that the time interval between the parts where the pressure reaches the lowest point in both FIGS. 2A and 2B is almost always constant in conjunction with the rotational speed of the propeller, and in general, when the propeller blade is in a specific position, Is to be minimal.

In the case of a general ship, since there is no device capable of controlling the fluctuation pressure, the fluctuation pressure component (pressure wave) induced by the propulsion engine has a hull structure as it is, which causes a high vibration level of the ship. . In particular, since the amplitude of the components corresponding to one and two times the blade passing frequency is higher than other components, the vibration of the hull structure is greatly affected.

Accordingly, the present invention, the vibration of the ship that can minimize the vibration of the hull structure (steel) by controlling the internal pressure in the specific hull portion that is most affected by the fluctuation pressure corresponding to the fluctuation pressure component generated in the propulsion engine of the ship We propose a control technique. In other words, if the fluctuation pressure outside the hull is lower than the average pressure, the pressure inside the hull is also low. On the contrary, if the fluctuation pressure outside the hull is high, the pressure inside the hull is also controlled to be high, so that the hull (steel or steel plate) The purpose is to reduce vibration by minimizing the pressure difference between the external and external.

In addition, the present invention is to propose a technique focused on changing the pressure field inside the hull structure around the time when the fluctuation pressure generated by the propulsion engine delivered to the stern portion of the ship becomes the minimum pressure.

According to one aspect for solving the problems of the present invention, the pressure sensor is installed on the surface of the ship adjacent to the propulsion engine of the vessel and measures the fluctuation pressure of the surface of the vessel according to the driving of the propulsion engine, the pressure sensor and the pressure sensor Mounted inside the ship adjacent to the propulsion engine of the ship, the air chamber is formed a constant air pressure, the actuator for opening and closing the flow of the air pressure of the air chamber, and any pressure in accordance with the pressure measured by the pressure sensor In order to adjust the pressure of the air chamber to have a control unit for controlling the opening and closing of the actuator provides a ship vibration control device by the variable pressure of the propeller.

According to another aspect for solving the problems of the present invention, the process of measuring the fluctuation pressure of the surface of the vessel adjacent to the propulsion engine of the ship, and the propulsion engine of the vessel so that the phase and the fluctuation pressure of the measured surface of the vessel is the same Provided is a ship vibration control method by varying pressure of a propeller including a process of adjusting an adjacent hull internal pressure.

According to the present invention, by adjusting the pressure inside the hull corresponding to the fluctuation pressure component induced by the propulsion engine of the ship, the fluctuation pressure (vibration force) exerted from the outside of the hull steel as compared with the absence of the above-mentioned adjusting device. It can reduce the vibration of the steel by the bar, can increase the stability in the operation of the ship and reduce the operating noise.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3 is a configuration diagram of a variable pressure control apparatus for a ship according to an embodiment of the present invention, wherein the ship 1, the propulsion engine 2, the shaft shaft 3, and the position information detection unit ( 100, a pressure sensor 102, a controller 104, an actuator 106, a first air chamber 108, a second air chamber 110, and an air inflow line 112.

As shown in FIG. 3, the position information detection unit 100 is mounted at an arbitrary position on the shaft axis 3 of the ship 1 as a means for scanning the initial position of the propulsion engine 2. . The position information detecting unit 100 may be configured of, for example, an encoder, a tachometer, or the like, and describes position information of the propulsion engine 2 corresponding to the initial position scanning result of the propulsion engine 2 to be described later. It serves to apply to the control unit 104.

Pressure sensor 102 is installed on the surface of the vessel (1), preferably the part that is most affected by the fluctuation pressure by the propulsion engine (2), the pressure information generated as the propulsion engine (2) rotates It senses and serves to apply to the control unit 104 to be described later.

The controller 104 samples the position information from the position information detector 100 and the pressure sensing information from the pressure sensor 102, and controls the actuator 106 to open / close based on the sampling result. . At this time, the pressure change level in the first air chamber may be adjusted to be similar to the change amount by analyzing the change level of the fluctuation pressure.

More specifically, the control unit 104 detects the rotational position information of the propulsion engine 2 when the fluctuation pressure becomes the lowest from the positional information from the positional information detecting unit 100, and senses the pressure from the pressure sensor 102. Outputs information as a change pressure signal over time, and detects a time point where the pressure decreases to the lowest point and then rapidly increases (position of the propulsion engine) around the preset minimum pressure with reference to the output change pressure signal. 1 Open / close control of the actuator 106 so that the internal pressure of the air chamber 108 becomes a pressure change of the above type.

That is, in the present invention, since it is practically difficult to monitor the fluctuation pressure caused by the cavity generation applied to the hull structure as a whole, and control the pressure inside the air chamber to be perfectly matched with the fluctuation pressure signal of the outside, the signal of the fluctuation pressure It is characterized by controlling the actuator 106 to adjust the pressure inside the first air chamber 108 by focusing near the point of the lowest pressure which shows the most distinctive feature of the form and greatly affects the amplitude of the fluctuation pressure. to be.

The first air chamber 108 is installed inside the vessel 1, more specifically, inside the vessel 1 adjacent to the surface of the vessel 1 in which the pressure sensor 102 is installed, and an air inflow line ( 112 is connected to the second air chamber 110 through the actuator 106.

The first air chamber 108 forms a constant air pressure in an initial state, and the first air chamber 108 corresponds to a switching operation of the actuator 106, for example, a valve opening operation according to an ON signal of the control unit 104. ) Air is introduced into the second air chamber (110). For this operation, a predetermined air pressure is preferably formed in the first air chamber 108, and the second air chamber 110 should be set to a vacuum state.

That is, according to the present invention, the pressure of the first air chamber 108 is controlled by controlling the actuator 106 to have the same pressure as the pressure sensing information of the pressure sensor 102 installed at the most affected by the fluctuation pressure of the hull structure. By adjusting the, it is implemented to minimize the vibration by reducing the pressure difference between the inside and outside of the actual hull.

This structure can be changed in the form as shown in FIG.

4 is a configuration diagram of a ship vibration control device according to another embodiment of the present invention, the vessel 1, the propulsion engine 2, the shaft shaft 3, the position information detection unit 100, the pressure sensor 102, the control unit 104, the actuator 106, the first air chamber 108, the cylinder structure 114a, and the piston 114b.

4, the second air chamber 110 and the air inlet line 112 of FIG. 3 are removed, and instead, the cylindrical structure 114a is connected to and installed in the first air chamber 108. It is characterized in that the actuator 106 to drive the piston 114b in the cylinder to adjust the internal pressure of the first air chamber 108.

4 is the same as the embodiment of FIG. 3 except for the above-described cylinder structure 114a and the piston 114b, the rest of the configuration and functions will be omitted.

Hereinafter, the above-described configuration, with reference to the flowchart of Figure 5 attached to the variable pressure control process of the ship according to another aspect of the present invention will be described in detail.

First, in step S400, the position information detection unit 100 receives the position information of the propulsion engine 2 corresponding to the initial position scanning result of the propulsion engine 2. The reason for receiving the positional information of the propulsion engine 2 as described above is that the rotational position information of the propulsion engine 2 is detected when the fluctuation pressure becomes the lowest, and then the first air is generated only by the positional information of the propulsion engine 2. To control to regulate the pressure of the seal 108.

Thereafter, the controller 104 determines whether a predetermined time has elapsed (S402), and if a predetermined time has elapsed, the controller 104 proceeds to step S404 to detect pressure sensing information of the pressure sensor 102.

Thereafter, the controller 104 samples the position information and the pressure sensing information, and adjusts the air pressure of the first air chamber 108 by controlling the actuator 106 based on the sampling result (S406) (S408).

Specifically, the control unit 104 detects the rotational position information of the propulsion engine 2 when the fluctuation pressure becomes the lowest from the positional information from the positional information detection unit 100, and the pressure sensing information from the pressure sensor 102. Is output as a change pressure signal according to time, and when the pressure drops and rises above a predetermined level before and after the preset minimum pressure with reference to the output change pressure signal, the first air chamber ( The actuator 106 is opened so that the internal pressure of 108 is at an arbitrary pressure according to the variable pressure signal, preferably at a level similar to the variable pressure signal, and more preferably in phase with the variable pressure signal. / Lung control.

That is, in view of the fact that the present invention is difficult to control the rapidly changing fluctuation pressure rather than monitoring and controlling the pressure of the cavity applied to the hull structure as a whole, the pressure decreases and then rises around the lowest pressure. In an embodiment, an efficient control method of controlling the actuator 106 is formed such that a pressure field in which the air pressure of the first air chamber 108 is similar to an external fluctuation pressure is formed.

For this reason, the present invention controls the actuator 106 to have a pressure similar to the pressure sensing information of the pressure sensor 102 installed at the most affected by the fluctuation pressure of the hull structure, so that the pressure of the first air chamber 108 is reduced. By adjusting, the vibration of the actual hull structure can be minimized by minimizing the pressure difference between the outside and the inside of the hull according to the change of time.

6 is a graph exemplarily illustrating application results of the embodiments of FIGS. 3, 4, and 5 described above.

In FIG. 6, the horizontal axis represents time t change rate, and the vertical axis represents pressure level. The waveform A is the variable pressure signal detected through the pressure sensor 102, and the waveform B is the first air chamber 108 which is controlled by turning on / off the actuator 106 under the control of the controller 104. It shows internal pressure change.

As illustrated in FIG. 6, it can be seen that the internal pressure of the first air chamber 108 is adjusted such that the lowest center point of time of the waveform B substantially coincides with the starting point of the lowest point of the waveform A. Referring to FIG.

As described above, the present invention provides an air chamber inside a ship that is most affected by the fluctuation pressure of the hull structure, measures the pressure on the surface of the ship provided with the air chamber, and is in phase with the measured fluctuation pressure. By adjusting the pressure of the air chamber so as to minimize the pressure change applied to the actual hull structure.

On the other hand, the embodiments of the present invention have been described in detail, but the present invention is not limited to these embodiments, and various modifications may be made by those skilled in the art within the spirit and scope of the present invention described in the claims below. .

1 is a detailed illustration of the propulsion engine of a typical ship;

2a and 2b is an exemplary graph of the fluctuation pressure of the propulsion engine of the conventional vessel,

3 is a block diagram of a vibration control apparatus of a ship by the fluctuation pressure of the propeller according to an embodiment of the present invention,

4 is a configuration diagram of a vibration control apparatus of a ship by the fluctuation pressure of the propeller according to another embodiment of the present invention;

5 is a flowchart illustrating a vibration control method of a ship due to a fluctuation pressure of a propeller according to another aspect of the present invention;

6 is a graph showing the results of the vibration control of the ship by the fluctuation pressure of the propeller according to the present embodiment.

Claims (9)

A pressure sensor for measuring the fluctuation pressure of the surface of the ship according to the driving of the propulsion engine of the ship; An air chamber mounted inside the vessel so as to face the pressure sensor and having a predetermined air pressure; An actuator for opening / closing the flow of air pressure in the air chamber, Control unit for opening and closing the actuator to control the pressure of the air chamber to have a certain pressure in accordance with the pressure measured by the pressure sensor Ship vibration control device according to the propeller fluctuation pressure comprising a. The method of claim 1, The ship vibration control device according to the propeller fluctuation pressure, A position information detection unit mounted at an arbitrary position on the shaft axis of the vessel to scan the initial position of the propulsion engine and apply the position information of the propulsion engine corresponding to the scanning result to the controller; Ship vibration control device according to the propeller variable pressure, characterized in that it further comprises. The method of claim 2, The control unit is configured to sample the position information from the position information detection unit and the pressure sensing information from the pressure sensor, and to control the actuator to open / close based on the sampling result. By ship vibration control device. The method of claim 3, wherein The control unit detects rotation position information of the propulsion engine when the fluctuation pressure is the lowest in the position information, outputs the pressure sensing information as a fluctuation pressure signal according to time, and is preset with reference to the output fluctuation pressure signal. A thruster which detects a time point when the pressure drops and rises around the lowest pressure point, and controls the actuator to open / close the actuator so that the internal pressure of the air chamber is in phase with the variable pressure signal; Ship vibration control device by variable pressure. Measuring the fluctuation pressure on the surface of the ship adjacent to the ship's propulsion engine; Adjusting the hull internal pressure adjacent to the propulsion engine of the vessel so that the phase and the fluctuation pressure of the surface of the vessel is measured Ship vibration control method according to the propeller fluctuation pressure comprising a. The method of claim 5, wherein The variable pressure control method, Scanning the initial position of the propulsion engine by a position information detection unit mounted at an arbitrary position on the shaft axis of the vessel; Detecting location information of the propulsion engine corresponding to the scanning result Ship vibration control method according to the propeller fluctuation pressure further comprising. The method of claim 6, The process of adjusting the internal pressure of the vessel, Sampling the detected position information and the measured fluctuation pressure; Adjusting the internal pressure based on the sampling result Ship vibration control method according to the propeller fluctuation pressure comprising a. The method of claim 7, wherein The sampling process, Detecting rotational position information of the propulsion engine when the fluctuation pressure becomes the predetermined minimum pressure in the position information; Outputting the measured fluctuation pressure as a fluctuation pressure signal over time; Detecting a time point at which the rate of change of pressure rises more than a predetermined level at the predetermined minimum pressure with reference to the output variable pressure signal; Ship vibration control method according to the propeller fluctuation pressure comprising a. The method of claim 8, The process of adjusting the internal pressure, The ship vibration control method according to the propeller fluctuation pressure, characterized in that for adjusting the internal pressure of the ship so as to match the phase and the variable pressure signal at the time of the sudden rise.
KR1020080069014A 2008-07-16 2008-07-16 Method and apparatus for controlling ship vibration induced by pressure fluctuation of propeller KR20100008497A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051915A1 (en) * 2011-10-07 2013-04-11 삼성중공업 주식회사 Excitation force reducing type ship
KR101399961B1 (en) * 2012-01-10 2014-05-27 삼성중공업 주식회사 A ship
CN106458307A (en) * 2014-05-02 2017-02-22 三星重工业株式会社 Ship for reducing propeller cavitation-induced excitation force

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051915A1 (en) * 2011-10-07 2013-04-11 삼성중공업 주식회사 Excitation force reducing type ship
CN103842246A (en) * 2011-10-07 2014-06-04 三星重工业株式会社 Excitation force reducing type ship
KR101399961B1 (en) * 2012-01-10 2014-05-27 삼성중공업 주식회사 A ship
CN106458307A (en) * 2014-05-02 2017-02-22 三星重工业株式会社 Ship for reducing propeller cavitation-induced excitation force

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