CN109080764B - Method for determining axis center line of anti-rolling fin - Google Patents
Method for determining axis center line of anti-rolling fin Download PDFInfo
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- CN109080764B CN109080764B CN201810549571.9A CN201810549571A CN109080764B CN 109080764 B CN109080764 B CN 109080764B CN 201810549571 A CN201810549571 A CN 201810549571A CN 109080764 B CN109080764 B CN 109080764B
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- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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Abstract
The invention discloses a method for determining a central line of a stabilizing fin shaft, which comprises the steps of marking a rib position line of a rib position where the central line of the stabilizing fin shaft is located on an outer plate of a ship body, finding out a first connecting point of the central line of the stabilizing fin shaft on the rib position line, setting a marking plane parallel to the rib position line below the central line of the stabilizing fin shaft, obtaining a transverse included angle α and a longitudinal included angle β of the central line of the stabilizing fin shaft and a projection point of the first connecting point on the marking plane, obtaining a second connecting point of the central line of the stabilizing fin shaft on the marking plane by utilizing a trigonometric function relation, and connecting the first connecting point and the second connecting point to quickly determine the central line of the stabilizing fin shaft.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a method for determining a central line of an anti-rolling fin shaft.
Background
Fin stabilizer is used as an active stabilizer and has a wide range of applications. The equipment is mostly arranged at bilges on two sides in a ship, and the cross section of the equipment is an airfoil shape, which is also called as a side rudder. The fin stabilizer is rotated through the control mechanism, so that the water flow generates acting force on the fin, the stabilizing moment is formed, and the swing is reduced, so that the rolling of the ship body is reduced. The ship body line type change at the installation position of the fin stabilizer is large, so the requirement on the positioning precision of the axis of the fin is high, if the positioning and the installation of the fin stabilizer have slight deviation, the efficiency and the service life of the fin can be reduced, and even the fin can collide with a ship hull plate when rotating, so that safety accidents are caused. In the prior art, the measurement operation of the central line of the axis of the anti-rolling fin is complex, and complex calculation is involved in the measurement process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and designs a method for determining the axis center line of a stabilizing fin.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for determining the axis center line of a stabilizing fin specifically comprises the following steps:
step 1: calibrating the average base line L of the whole ship according to the base line measuring method0；
Step 2:obtaining the rib position number of the central line of the axis of the anti-sway fin from an anti-sway fin arrangement installation drawing, and punching a rib position line L on the hull outer plate by using a total station according to the obtained rib position number1；
And step 3: utilizing a total station to punch out an average base line L with the whole ship on a hull plate0Waterline L with vertical distance h betweenhLine L of assemblyhAnd the rib position line L1The intersection point of the first connecting point and the second connecting point is used as a first connecting point of the central line of the anti-rolling fin shaft;
and 4, step 4: a marking plane parallel to the stabilizer is set below the axis of the stabilizer, and the vertical distance between the marking plane and the average base line of the whole ship is h0；
Step 5, acquiring a transverse included angle α and a longitudinal included angle β of the central line of the axis of the anti-rolling fin from an anti-rolling fin arrangement and installation drawing, making a projection point of a first connection point on a scribing plane, and acquiring a second connection point of the central line of the axis of the anti-rolling fin on the scribing plane by utilizing a trigonometric function relation according to a distance value H between the first connection point and the projection point thereof, and the transverse included angle α and the longitudinal included angle β;
step 6: and connecting the first connecting point with the second connecting point to form the axis center line of the anti-rolling fin.
Preferably, in the step 1, the average baseline L of the whole ship is calibrated according to a baseline measurement method0The method comprises the following specific steps:
step 1.1: determining the rib position of the baseline measurement according to a ship body completion measurement diagram and recording the rib position number;
step 1.2: the method comprises the following steps of placing a level gauge at a position, which is lower than a set height of a ship body base line, of one side of a ship body, and respectively marking a horizontal datum line L which is lower than the ship body base line and vertical to a ship body central line at each rib position by rotating the level gauge;
step 1.3, respectively measuring the vertical heights △ h between the hull planks at each rib position and the corresponding horizontal datum line, and averaging all the measured vertical heights to obtain the average vertical height
Step 1.4: the average base line L of the whole ship is marked above the level meter0The full ship average baseline L0The height of the horizontal laser line from the level is
Wherein d is the plate thickness of the hull plate.
Preferably, the specific step of acquiring the second connection point of the central line of the anti-rolling fin shaft on the scribing plane in the step 5 is as follows:
step 5.1: calculating the lateral offset distance l of the second connecting point relative to the projection point of the first connecting point on the scribing plane1；
Step 5.2: calculating the longitudinal offset distance l of the second connecting point relative to the projection point of the first connecting point on the scribing plane2；
Step 5.3: taking the projection point of the first connecting point on the scribing plane as a reference point, and calculating the transverse offset distance l1And a longitudinal offset distance l2And determining a second connection point on the marking plane by using the total station.
Preferably, the lateral offset distance/1H/tan α, the longitudinal offset distance l2＝H/sinα*tanβ，H＝h+h0。
Preferably, the water line LhMean base line L of the plane and the whole ship0The planes are parallel.
The invention has the following positive beneficial effects: the invention relates to a ship body outer plate, which is characterized in that a rib position line L of a rib position where the central line of an anti-rolling fin shaft is located is formed on the ship body outer plate1Finding out the rib position line L of the central line of the anti-rolling fin shaft1The first connecting point is set below the axis of the anti-rolling fin, a scribing plane parallel to the axis of the anti-rolling fin is set below the axis of the anti-rolling fin, a second connecting point of the axis of the anti-rolling fin on the scribing plane is obtained by obtaining the transverse included angle α and the longitudinal included angle β of the axis of the anti-rolling fin and the projection point of the first connecting point on the scribing plane, the trigonometric function relation is utilized to obtain the second connecting point of the axis of the anti-rolling fin on the scribing plane, and the axis of the anti-rolling fin can be quickly determined by connecting the first connecting point withThe method is easy to operate, suitable for various ship types, high in universality and easy to popularize and apply, the calibration error of the central line of the stabilizing fin shaft is reduced, and the marked whole ship average base line, the marked rib position line, the marked waterline, the calculated transverse offset distance, the calculated longitudinal offset distance and the like can be used for conveniently testing the calibration error of the central line of the stabilizing fin shaft in the later period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the measurement of the present invention.
FIG. 2 is a second schematic diagram of the measurement of the present invention.
The specific meanings of the reference numbers in the figures are: 0 is a first connecting point, P is a marking plane, A is a projection point of the first connecting point on the marking plane, C is a second connecting point, and 1 is a ship hull plate.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The embodiment is described by combining fig. 1, and the method provided by the invention is used for determining the central line of the stabilizer shaft required by the installation of the stabilizer, is simple, convenient and easy to operate, is suitable for various ship types, has strong universality and is easy to popularize and apply, and the calibration error of the central line of the stabilizer shaft is reduced.
The invention discloses a method for determining the axis center line of a stabilizing fin, which comprises the following steps:
step (ii) of1: calibrating the average base line L of the whole ship according to the base line measuring method0。
Specifically, firstly, determining a rib position measured by a base line according to a ship body finish measuring chart and recording a rib position number, secondly, placing a level meter at a position on one side of a ship body, which is lower than a set height of a ship body base line, respectively marking a horizontal reference line L which is lower than the ship body base line and is vertical to the ship body central line at each rib position by rotating the level meter, then respectively measuring the vertical height △ h between a ship body outer plate at each rib position and the corresponding horizontal reference line, and averaging all the measured vertical heights to obtain an average vertical height
The average base line L of the whole ship is marked above the level meter0The full ship average baseline L0The height of the horizontal laser line from the level is
Wherein d is the plate thickness of the hull plate.
In this embodiment, assuming that the rib positions required for the baseline measurement acquired from the ship body finish measurement chart are 10 steps, a level is used to mark a horizontal reference line at each rib position, and then the vertical height △ h between the ship body outer plate at each rib position and the corresponding horizontal reference line is measured in sequence1、△h2…△h10The 10 measured vertical height values are averaged
According to average vertical height
The average base line L of the whole ship is marked above the level gauge according to the thickness d of the outer plate of the ship body0。
Step 2: obtaining the rib position number of the central line of the axis of the anti-sway fin from an anti-sway fin arrangement installation drawing, and punching a rib position line L on the hull outer plate by using a total station according to the obtained rib position number1。
And step 3: utilizing a total station to punch out an average base line L with the whole ship on a hull plate0Waterline L with vertical distance h betweenhThe waterline LhMean base line L of the plane and the whole ship0The planes are parallel. Order waterline LhAnd the rib position line L1The intersection point of the two points is used as a first connecting point O of the central line of the stabilizing fin shaft.
And 4, step 4: setting a marking plane p parallel to the stabilizer below the axis of the stabilizer, and enabling the marking plane p to be parallel to the average base line L of the whole ship0Has a vertical distance h between0In the present embodiment, the scribing plane p is set at a position 1000mm below the average baseline of the whole ship, and the average baseline of the whole ship is parallel to the scribing plane p.
Step 5, acquiring a transverse included angle α and a longitudinal included angle β of the central line of the axis of the fin stabilizer from a fin stabilizer arrangement and installation drawing, making a projection point A of a first connecting point O on a marking plane, and calculating a transverse offset distance l of a second connecting point C relative to the projection point A of the first connecting point on the marking plane by utilizing trigonometric function relation according to a distance value H between the first connecting point 0 and the projection point A thereof, and the transverse included angle α and the longitudinal included angle β1The second connecting point C is longitudinally offset by a distance l relative to the projection point A of the first connecting point on the scribing plane2Said lateral offset distance l1H/tan α, offset longitudinally by a distance l2＝H/sinα*tanβ，H＝h+h0. Then, the projection point of the first connection point on the scribing plane is taken as a reference point, and the calculated transverse offset distance l is used as the reference point1And a longitudinal offset distance l2And determining a second connection point on the marking plane by using the total station.
Step 6: and connecting the first connecting point O with the second connecting point C to form the central line OC of the anti-rolling fin shaft.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. A method for determining the axis center line of a stabilizing fin is characterized by comprising the following steps:
step 1: calibrating the average base line L of the whole ship according to the base line measuring method0；
Specifically, step 1.1: determining the rib position of the baseline measurement according to a ship body completion measurement diagram and recording the rib position number;
step 1.2: the method comprises the following steps of placing a level gauge at a position, which is lower than a set height of a ship body base line, of one side of a ship body, and respectively marking a horizontal datum line L which is lower than the ship body base line and vertical to a ship body central line at each rib position by rotating the level gauge;
step 1.3, respectively measuring the vertical heights △ h between the hull planks at each rib position and the corresponding horizontal datum line, and averaging all the measured vertical heights to obtain the average vertical height
Step 1.4: the average base line L of the whole ship is marked above the level meter0The full ship average baseline L0The height of the horizontal laser line from the level is
Wherein d is the plate thickness of the hull plate;
step 2: obtaining the rib position number of the central line of the axis of the anti-sway fin from an anti-sway fin arrangement installation drawing, and punching a rib position line L on the hull outer plate by using a total station according to the obtained rib position number1；
And step 3: utilizing a total station to punch out an average base line L with the whole ship on a hull plate0Waterline L with vertical distance h betweenhLine L of assemblyhAnd the rib position line L1The intersection point of the first connecting point and the second connecting point is used as a first connecting point of the central line of the anti-rolling fin shaft;
and 4, step 4: a marking plane parallel to the stabilizer is set below the axis of the stabilizer, and the vertical distance between the marking plane and the average base line of the whole ship is h0；
Step 5, acquiring a transverse included angle α and a longitudinal included angle β of the central line of the axis of the anti-rolling fin from an anti-rolling fin arrangement and installation drawing, making a projection point of a first connection point on a scribing plane, and acquiring a second connection point of the central line of the axis of the anti-rolling fin on the scribing plane by utilizing a trigonometric function relation according to a distance value H between the first connection point and the projection point thereof, and the transverse included angle α and the longitudinal included angle β;
step 6: and connecting the first connecting point with the second connecting point to form the axis center line of the anti-rolling fin.
2. The method for determining the centerline of the stabilizer fin shaft as claimed in claim 1, wherein the step 5 of obtaining the second connection point of the centerline of the stabilizer fin shaft on the scribing plane comprises the following specific steps:
step 5.1: calculating the lateral offset distance l of the second connecting point relative to the projection point of the first connecting point on the scribing plane1；
Step 5.2: calculating the longitudinal offset distance l of the second connecting point relative to the projection point of the first connecting point on the scribing plane2；
Step 5.3: taking the projection point of the first connecting point on the scribing plane as a reference point, and calculating the transverse offset distance l1And a longitudinal offset distance l2And determining a second connection point on the marking plane by using the total station.
3. Method for determining a fin axis centreline according to claim 2, characterised in that the lateral offset distance/, is1H/tan α, the longitudinal offset distance l2＝H/sinα*tanβ，H＝h+h0。
4. Method for determining a fin axis centreline according to claim 1, characterised in that said waterline LhThe plane is parallel to the whole shipMean base line L0The planes are parallel.
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| CN201810549571.9A CN109080764B (en) | 2018-05-31 | 2018-05-31 | Method for determining axis center line of anti-rolling fin |
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| CN109080764B true CN109080764B (en) | 2020-06-23 |
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| CN113562138B (en) * | 2021-08-27 | 2022-11-25 | 芜湖造船厂有限公司 | Method for pulling inclined long shaft of ship |
| CN113954044B (en) * | 2021-11-19 | 2024-06-11 | 沪东中华造船(集团)有限公司 | Investigation method for line extension line in ship centerline cabin |
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