KR100658244B1 - A method to avoid resonance between pump mast tower and ship's propeller - Google Patents

A method to avoid resonance between pump mast tower and ship's propeller Download PDF

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Publication number
KR100658244B1
KR100658244B1 KR1020050056162A KR20050056162A KR100658244B1 KR 100658244 B1 KR100658244 B1 KR 100658244B1 KR 1020050056162 A KR1020050056162 A KR 1020050056162A KR 20050056162 A KR20050056162 A KR 20050056162A KR 100658244 B1 KR100658244 B1 KR 100658244B1
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South Korea
Prior art keywords
propeller
pump tower
resonance
pump
tower
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KR1020050056162A
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Korean (ko)
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이영범
허주호
한성곤
오상헌
박형식
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대우조선해양 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/30—Arrangement of ship-based loading or unloading equipment for transfer at sea between ships or between ships and off-shore structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

In a method to avoid resonance between a pump mast tower and a ship propeller is provided to arrange a weight material for controlling a natural frequency at the center of one side of the pump tower. In a method to avoid resonance between a pump mast tower(10) and a ship propeller, the pump tower of a triangular shape has the largest displacement of a mode of bending the whole in a bow shape for avoiding resonance between the pump tower and the ship propeller. A weight material(20) for controlling a natural frequency is arranged at the center of one side of the pump tower.

Description

엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법{A method to avoid resonance between pump mast tower and ship's propeller}A method to avoid resonance between pump mast tower and ship's propeller}

도 1은 본 발명에 의한 펌프타워의 측면도1 is a side view of a pump tower according to the present invention

도 2는 본 발명에 의한 고유진동수 변경상태를 나타낸 도면2 is a view showing a natural frequency change state according to the present invention

도 3은 종래 펌프타워의 설치상태를 나타낸 화물창의 정면도Figure 3 is a front view of the cargo hold showing the installation state of the conventional pump tower

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 펌프타워 20 : 중량물10: pump tower 20: heavy goods

본 발명은 엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법에 관한 것이다.The present invention relates to a method of avoiding resonance between a propeller and a pump tower for loading and unloading liquid cargo of an LENG vessel.

본 발명은 화물창에 설치되는 펌프타워의 고유진동수를 변경시키기 위해 과도한 구조 및 설계 변경을 거치지 아니하고 프로펠러와의 공진을 용이하게 회피할 수 있도록 한 것이다.The present invention is to make it easy to avoid resonance with the propeller without undergoing excessive structural and design changes to change the natural frequency of the pump tower installed in the cargo hold.

도 3에서와 같이 펌프타워(2)는 엘엔지선의 화물창(1)에 설치되는 약 30m 높이의 대형구조물로서, 선박의 주 추진기관인 프로펠러와의 공진 가능성이 항시 상 존하며 구조물의 고유진동수는 그 구조물의 강성 밀 질량(분포)로 결정되는데, 커다란 3개의 파이프로 지지되는 펌프타워(2)와 같은 구조물의 경우 강성의 변경은 쉽지 않다. As shown in FIG. 3, the pump tower 2 is a large structure having a height of about 30 m installed in the cargo hold 1 of the L & G line, and there is always a possibility of resonance with the propeller, which is the main propulsion engine of the ship, and the natural frequency of the structure is It is determined by the stiffness mill mass (distribution) of. For structures such as the pump tower (2), which is supported by three large pipes, changing the stiffness is not easy.

일반적으로 밴딩에 대한 강성은, 파이프의 직경, 두께 등의 몇 개의 인자로 결정되기 때문에 상기 강성을 증가시키기 위해서는 파이프의 직경을 키우거나 두께 등을 키워야 하는데 이 경우에는 필연적으로 질량이 더불어서 증가하므로 그 효과는 수 % 이하일 정도로 효과적이지 않다.In general, the rigidity for the bending is determined by several factors such as the diameter and thickness of the pipe. Therefore, to increase the rigidity, the diameter of the pipe or the thickness must be increased. The effect is not effective to a few percent or less.

이를 위해 종래에는 상기 공진을 회피하기 위한 목적으로 프로펠러의 날개수를 변경하고 (중간부분 삭제) 있으나 상기 프로펠러의 날개수를 변경하여 펌프타워(2)와의 공진을 회피하도록 하는 방법의 (중간부분 삭제) 선박의 경우 거주설비, 엔진 케이싱, 선미 피이크 탱크 등에 국부적인 진동이 부수적으로 동반되는 문제점이 발생하게 되며 상기와 같은 공진에 적절하게 대응하지 못하는 경우에는 진동에 의한 피로파괴 등의 심각한 문제가 발생되어 엘엔지 선박의 안전에 큰 위해를 가할 수 있어 펌프타워(2)와 프로펠러와의 공진을 회피하도록 하는 또 다른 해결방법이 모색되어야 할 필요성이 있다.To this end, conventionally, the number of blades of the propeller is changed for the purpose of avoiding the resonance, and the number of blades of the propeller is changed, but the method of the method for avoiding resonance with the pump tower 2 is omitted. In the case of ships, local vibrations are incidentally accompanied by residential facilities, engine casings, stern peak tanks, etc., and failure to adequately cope with such resonance may cause serious problems such as fatigue failure due to vibrations. There is a need to find another solution to avoid the resonance between the pump tower (2) and the propeller, which can pose a significant harm to the safety of the LENG vessel.

본 발명은 화물창에 설치되는 펌프타워의 고유진동수를 변경시키기 위해 과도한 구조 및 설계 변경을 거치지 아니하고 프로펠러와의 공진을 용이하게 회피할 수 있도록 함을 목적으로 한다.It is an object of the present invention to easily avoid resonance with a propeller without undergoing excessive structural and design changes in order to change the natural frequency of the pump tower installed in the cargo hold.

이를 위해 본 발명은 엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프 로펠러와의 공진 회피방법에 있어서, To this end, the present invention is a method for avoiding resonance between a pump tower and a propeller for unloading liquid cargo of an LENG vessel,

상기 펌프타워와 프로펠러와의 공진 회피를 위해 전체가 활 모양으로 휘는 모드(Mode)의 변위가 가장 큰 삼각형태의 펌프타워 일측면 중앙부에 집중 질량에 의한 프로펠러와의 공진 회피를 목적으로 하는 고유진동수 콘트롤용 중량물을 배치하는 것을 특징으로 하는 엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법을 제공함으로서 상기 목적을 달성하고자 한다.To avoid resonance between the pump tower and the propeller, a natural frequency aimed at avoiding resonance with the propeller due to the concentrated mass in the central portion of one side of the pump tower having the largest triangular displacement in the shape of a bow. The object of the present invention is to provide a method for avoiding resonance between a propeller and a pump tower for loading and unloading a liquid cargo of an LENG vessel, characterized by disposing a heavy object for control.

본 발명은 엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법에 있어서, The present invention relates to a method of avoiding resonance between a propeller and a pump tower for loading and unloading liquid cargo of an LENG vessel.

상기 펌프타워(10)와 프로펠러와의 공진 회피를 위해 전체가 활 모양으로 휘는 모드의 변위가 가장 큰 삼각형태의 펌프타워(10) 일측면 중앙부에 집중 질량에 의한 프로펠러와의 공진 회피를 목적으로 하는 고유진동수 콘트롤용 중량물(20)을 배치하는 것을 특징으로 한다.In order to avoid resonance between the propeller and the propeller due to the concentrated mass in the central portion of one side of the triangular pump tower 10 having the largest displacement of the bow-shape mode to avoid resonance between the pump tower 10 and the propeller. Characterized in that the arrangement for the natural frequency control weight 20 to.

첨부도면 도 1은 본 발명에 의한 펌프타워의 측면도이고, 도 2는 본 발명에 의한 고유진동수 변경상태를 나타낸 도면이다.1 is a side view of a pump tower according to the present invention, Figure 2 is a view showing a natural frequency change state according to the present invention.

본 발명은 엘엔지서의 화물창에 설치되는 펌프타워(10)의 기본적인 구조는 종래와 같다. The present invention is the basic structure of the pump tower 10 is installed in the cargo hold of the LENGER as in the prior art.

다만 본 발명은 상기 펌프타워(10)의 고유진동수를 변경시키기 위해 과도한 구조 및 설계 변경을 거치지 아니하고 프로펠러와의 공진을 용이하게 회피할 수 있도록 하기 위해 전체가 활 모양으로 휘는 모드의 변위가 가장 큰 삼각형태의 펌프 타워(10) 일측면 중앙부에 집중 질량에 의한 프로펠러와의 공진 회피를 목적으로 하는 고유진동수 콘트롤용 중량물(20)을 배치하고 있는 것이다. However, the present invention has the largest displacement of the bow-shaping mode in order to easily avoid resonance with the propeller without undergoing excessive structural and design changes to change the natural frequency of the pump tower 10. In the central portion of one side of the triangular pump tower 10, a natural frequency control heavy weight 20 is disposed for the purpose of avoiding resonance with the propeller due to the concentrated mass.

하기의 수식을 참조로 본 발명의 펌프타워(10)와 프로펠러와의 공진 회피방법을 상세히 설명하면 다음과 같다.The resonance avoidance method of the pump tower 10 and the propeller of the present invention will be described in detail with reference to the following formula.

Figure 112005034533838-pat00001
Figure 112005034533838-pat00001

여기서,

Figure 112006067096479-pat00002
는 W(중량물의 무게)가 고려된 펌프타워(10)의 고유진동수,
Figure 112006067096479-pat00003
는 중량물(20)이 없을 때의 펌프타워(10) 고유진동수,
Figure 112006067096479-pat00004
는 중량물(20)에 의한 처짐량을 나타낸다.
예컨대, 펌프타워(10)의 질량이 30 ton이고, 펌프타워(10) 1/3L 지점에서 5 ton의 집중 질량을 놓는다고 하면, w1=0.89*w11이 되어 약 11% 정도 고유진동수가 변하게 되는 것을 알 수 있다.
본 발명은 상기 수식에 의해 고유진동수의 변경상태를 대비한 도 2에서와 같이 펌프타워(10)의 직종별 주파수(Fundamental Frequency)는 전체적으로 활 모양으로 휘는 모드(Mode)를 나타내고 있는 바, 본 발명에서는 이러한 모드의 주파수를 변경시키기 위하여 집중 질량인 중량물(20)을 모드의 변위가 가장 큰 중앙부에 위치시킴으로써, 기존 설계를 거의 변경하지 않는 상태에서 적은 중량물(20)로서 효과적으로 프로펠러와의 공진을 회피할 수 있을 정도의 변경량 즉,
Figure 112006067096479-pat00005
에 해당하는 만큼의 고유진동수 변경이 발생되어 화물창에 설치되는 펌프타워(10)의 고유진동수를 변경시키기 위해 과도한 구조 및 설계 변경을 거치지 아니하고 프로펠러와의 공진을 용이하게 회피할 수 있게 되는 것이다.
예컨대, 펌프타워(10)의 질량이 30 ton이고, 펌프타워(10) 1/3L 지점에서 5 ton의 집중 질량을 놓는다고 하면, w1=0.89*w11이 되어 약 11% 정도 고유진동수가 변하는 것을 쉽게 알 수 있게 된다.here,
Figure 112006067096479-pat00002
Is the natural frequency of the pump tower 10 considering W (weight of heavy weight),
Figure 112006067096479-pat00003
Is the natural frequency of the pump tower (10) when there is no weight 20,
Figure 112006067096479-pat00004
Denotes the amount of deflection by the heavy material 20.
For example, if the mass of the pump tower 10 is 30 ton, and a concentrated mass of 5 tons is placed at the point of 1/3 L of the pump tower 10, w1 = 0.89 * w11, and the natural frequency changes by about 11%. It can be seen that.
According to the present invention, as shown in FIG. 2 in preparation for the changed state of the natural frequency, the frequency of the job of the pump tower 10 indicates a mode that is curved in a bow shape. In order to change the frequency of this mode, by placing the concentrated mass 20 at the center of the largest displacement of the mode, it is possible to effectively avoid resonance with the propeller as the small mass 20 with little change in the existing design. The amount of change you can make,
Figure 112006067096479-pat00005
It is possible to easily avoid resonance with the propeller without undergoing excessive structural and design changes to change the natural frequency of the pump tower 10 installed in the cargo hold as much as the natural frequency changes corresponding to the corresponding.
For example, if the mass of the pump tower 10 is 30 ton, and the concentrated mass of 5 ton is placed at the 1 / 3L point of the pump tower 10, w1 = 0.89 * w11, and the natural frequency is changed by about 11%. It's easy to see.

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이상에서는 본 발명의 바람직한 실시예에 대하여 도시하고 설명하였으나 본 발명은 상기한 실시예에 한정되지 아니하며 청구범위에서 청구하는 본 발명의 요지 를 벗어남이 없이 당해 본 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고 그와 같은 변경은 기재된 청구범위 내에 있게 된다.Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment without having to depart from the gist of the present invention claimed in the appended claims Anyone can make various modifications as well as such changes are within the scope of the appended claims.

본 발명은 화물창에 설치되는 펌프타워의 고유진동수를 변경시키기 위해 과도한 구조 및 설계 변경을 거치지 아니하고 전체가 활 모양으로 휘는 모드의 변위가 가장 큰 삼각형태의 펌프타워 일측면 중앙부에 집중 질량을 이용한 고유진동수 콘트롤용 중량물을 간단히 배치하여 프로펠러와의 공진을 용이하게 회피할 수 있는 매우 유용한 발명이다. The present invention uses a concentrated mass in the central portion of one side of the pump tower of the triangular shape with the largest displacement of the bow-shaped mode without undergoing excessive structural and design changes to change the natural frequency of the pump tower installed in the cargo hold. It is a very useful invention that can easily avoid the resonance with the propeller by simply placing the weight for frequency control.

Claims (1)

엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법에 있어서, In the method of avoiding resonance between a pump tower and a propeller for unloading liquid cargo of an LENG vessel, 상기 펌프타워(10)와 프로펠러와의 공진 회피를 위해 전체가 활 모양으로 휘는 모드의 변위가 가장 큰 삼각형태의 펌프타워(10) 일측면 중앙부에 집중 질량에 의한 프로펠러와의 공진 회피를 목적으로 하는 고유진동수 콘트롤용 중량물(20)을 배치하는 것을 특징으로 하는 엘엔지 선박의 액체화물 양하역을 위한 펌프타워와 프로펠러와의 공진 회피방법.In order to avoid resonance between the propeller and the propeller due to the concentrated mass in the central portion of one side of the triangular pump tower 10 having the largest displacement of the bow-shape mode to avoid resonance between the pump tower 10 and the propeller. A method for avoiding resonance between a pump tower and a propeller for discharging and unloading a liquid cargo of an LENG vessel, characterized by disposing a heavy object 20 for natural frequency control.
KR1020050056162A 2005-06-28 2005-06-28 A method to avoid resonance between pump mast tower and ship's propeller KR100658244B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200462150Y1 (en) 2010-03-23 2012-08-27 주식회사 한진중공업 Jig set for setting the pump tower in the cargo tank of LNG carrier
KR101185927B1 (en) 2010-11-04 2012-09-25 삼성중공업 주식회사 Cylinder-shaped pump tower and ship having the same
KR101324116B1 (en) 2011-12-06 2013-10-31 삼성중공업 주식회사 Floating lng facility having topside module capable maintenance of pump tower
KR101436669B1 (en) 2010-10-26 2014-09-01 현대중공업 주식회사 Pump tower for Liquified Gas carrier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200462150Y1 (en) 2010-03-23 2012-08-27 주식회사 한진중공업 Jig set for setting the pump tower in the cargo tank of LNG carrier
KR101436669B1 (en) 2010-10-26 2014-09-01 현대중공업 주식회사 Pump tower for Liquified Gas carrier
KR101185927B1 (en) 2010-11-04 2012-09-25 삼성중공업 주식회사 Cylinder-shaped pump tower and ship having the same
KR101324116B1 (en) 2011-12-06 2013-10-31 삼성중공업 주식회사 Floating lng facility having topside module capable maintenance of pump tower

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