Calculation method and system for ship shafting bearing loads and shafting alignment calculation system

Abstract

The present application provides a calculation method, a system and a shaft alignment calculation system for the bearing load of a ship shafting. The calculation method includes: based on the theoretical jacking curve of the jack and the jack load F corresponding to the jacking-off point JE obtain the theoretical equivalent jack load F J , according to the jack load F JE , the theoretical equivalent jack load F J and the jacking coefficient K to calculate the equivalent jacking coefficient K N . Based on the jacking method, obtain the measured jacking curve of the jack and the actual equivalent jack load F J '; according to the equivalent jacking coefficient K N and the actual equivalent jack load F J ' calculate the bearing load at the bearing of the ship shafting. The present application calculates the bearing load value by obtaining the equivalent jack load and uses this value as the bearing load at the bearing of the ship shafting. Compared with the prior art, it avoids the problem that the accuracy of the bearing load cannot be guaranteed due to inaccurate jacking-off point position. The present application can accurately calculate the bearing load, thus avoiding affecting the accuracy of the ship shaft alignment calculation.

Description

Technical Field

[0001] The present application relates to the technical field of ship shaft alignment, and in particular to a method and system for calculating ship shaft bearing loads and a shaft alignment calculation system. Background Art

[0002] Shaft alignment refers to the work of installing the shaft system on the hull through the hull structure and bearings in the ship assembly plant, which is a key operation in the ship construction process. In order to ensure the smooth progress of the ship shaft system operation, the ship assembly plant carries out shaft alignment design and shaft alignment construction operations. The quality of shaft alignment directly determines the load distribution of the shaft system bearings and the safety performance of ship operation.

[0003] In the process of shaft alignment, the calculation of bearing load is a key step. The existing bearing load calculation method is: determine the top point of the measured bearing according to the measured top lift curve, and determine the measured bearing load according to the jack load corresponding to the top point.

[0004] In the existing bearing load calculation method, in the process of obtaining the top point of the measured jacking curve, there are problems such as inaccurate top point position and error. Therefore, when determining the measured bearing load according to the jack load corresponding to the top point, the accuracy of the calculated bearing load cannot be guaranteed. Therefore, it will directly affect the shaft alignment process of the ship shaft system.

[0005] In summary, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the embodiment of the present application is to provide a method for calculating the load on a ship shafting bearing, which is suitable for the jacking method measurement process of the load on a ship shafting bearing and has the characteristic of accurate calculation.

[0007] A second objective of an embodiment of the present application is to provide a system for calculating a ship shafting bearing load using the above-mentioned method for calculating a ship shafting bearing load.

[0008] The third purpose of the embodiment of the present application is also to provide a shafting alignment calculation system, which uses the bearing load calculated in the above-mentioned ship shafting bearing load calculation system to perform shafting alignment calculation.

[0009] In a first aspect, a method for calculating a ship shaft bearing load is provided, comprising:

[0010] S1. Establish a calculation model and obtain a theoretical lifting curve of the jack based on the lifting method; obtain the jack load F corresponding to the top point of the theoretical lifting curve in the theoretical lifting curve. JE .

[0011] S2, obtaining the theoretical equivalent jack load F according to the theoretical lifting curve in the theoretical lifting curve diagram J .

[0012] S3, according to the jack load F corresponding to the top empty point JE , the theoretical equivalent jack load F J And the lifting coefficient K is used to calculate the equivalent lifting coefficient K N .

[0013] S4. The jack is arranged at the bottom of the shaft section near the ship shaft system bearing, and a measured jacking curve of the jack is obtained based on the jacking method.

[0014] S5, obtaining the actual equivalent jack load F according to the measured jacking curve in the measured jacking curve diagram J '; According to the equivalent lifting coefficient KN and the actual equivalent jack load F J ' Calculate the bearing load value and use this value as the bearing load at the ship shafting bearing.

[0015] In one embodiment, the abscissa of the theoretical lifting curve diagram represents the jack load, and the ordinate represents the jack displacement; in the theoretical lifting curve diagram, the theoretical lifting curve includes a lifting section and a lifting section; in step S2, the theoretical equivalent jack load F is obtained. J The method comprises: extending the empty section of the theoretical jacking curve in the reverse direction and intersecting it with the abscissa, and obtaining the jack load corresponding to the intersection point as the equivalent jack load F J .

[0016] In one embodiment, the horizontal axis of the measured lifting curve diagram represents the jack load, and the vertical axis represents the shaft displacement; the measured lifting curve diagram includes a lifting curve in the rising stage and a lifting curve in the descending stage of the jack; based on the lifting curve in the rising stage and the lifting curve in the descending stage, the middle line of the two is obtained as the measured lifting curve of the jack.

[0017] In one embodiment, in step S5, the actual equivalent jack load F is obtained. J ' includes: extending the middle line of the measured jacking curve in the reverse direction and intersecting it with the horizontal coordinate; obtaining the jack load corresponding to the intersection as the equivalent jack load F J ′.

[0018] In one embodiment, in step S1, the jack load F corresponding to the top point of the theoretical jacking curve in the theoretical jacking curve diagram is obtained. JEThe method comprises: obtaining the intersection of the jacking section and the emptying section as the emptying point of the theoretical jacking curve, and obtaining the jack load F corresponding to the emptying point according to the theoretical jacking curve. JE .

[0019] In one embodiment, the lifting section represents the relationship between the jack load and the jack displacement during the stage when the tested bearing and the jack jointly support the shaft system; the emptying section represents the relationship between the jack load and the jack displacement during the emptying stage after the tested bearing is empty.

[0020] In one embodiment, in step S4, the arranging the jack at the bottom of the shaft section near the ship shafting bearing includes: arranging the jack according to the position of the ship shafting bearing, arranging the jack close to the ship shafting bearing, and arranging the jack on a strong gear near the ship shafting bearing.

[0021] In one embodiment, the theoretical lifting curve is a theoretical lifting curve of a jack without considering the viscosity effect.

[0022] According to the second aspect of the present application, a system for calculating the load on a ship shafting bearing is also provided. The system comprises:

[0023] The first drawing module is used to draw a theoretical lifting curve diagram of the jack according to the lifting method.

[0024] The jack load acquisition module is used to obtain the jack load F corresponding to the top point of the theoretical jacking curve according to the theoretical jacking curve. JE and equivalent jack load F J .

[0025] The equivalent lifting coefficient acquisition module is used to obtain the equivalent lifting coefficient K and the corresponding jack load F at the top point. JE and the equivalent jack load F J Get the equivalent lifting coefficient K N .

[0026] The second drawing module is used to draw a measured jacking curve diagram of the jack according to the jacking method when the jack is arranged at the bottom of the shaft section near the ship shaft system bearing.

[0027] The bearing load calculation module is used to obtain the actual equivalent jack load F according to the measured lifting curve diagram. J ′, according to the actual equivalent jack load F J ' and equivalent lifting coefficient K N Calculate the bearing load value; use the bearing load value as the bearing load at the ship shaft system bearing.

[0028] According to the third aspect of the present application, a shafting alignment calculation system is also provided, including a shafting alignment calculation module, for performing ship shafting alignment calculation based on the bearing load calculated by the ship shafting bearing load calculation system provided in the second aspect.

[0029] Compared with the prior art, the beneficial effects of this application are:

[0030] In the technical solution of the present application, by obtaining the equivalent jack load, the bearing load value is calculated based on the equivalent jack load, and this value is used as the bearing load at the ship shafting bearing. Compared with the prior art, the process of determining the top empty point of the measured jacking curve is replaced, and the problem of the accuracy of the bearing load cannot be guaranteed due to the inaccurate position of the top empty point is avoided. The present application can accurately calculate the bearing load, thereby avoiding affecting the accuracy of the ship shafting alignment calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a flow chart of a method for calculating a ship shafting bearing load according to an embodiment of the present application;

[0033] Figure 2 The present invention is a layout diagram of shafting bearings and jacks in a method for calculating the load of a ship shafting bearing according to an embodiment of the present application;

[0034] Figure 3 A theoretical lifting curve diagram of a method for calculating a ship shafting bearing load according to an embodiment of the present application;

[0035] Figure 4 The present invention is a graph of actually measured jacking curves in a method for calculating the bearing load of a ship shaft system according to an embodiment of the present application.

[0036] Figure 5 is a measured lifting curve diagram of a bearing load of a real ship according to an embodiment of the present application;

[0037] Figure 6 The present invention is a block diagram of a system for calculating the load on a ship shafting bearing according to an embodiment of the present application;

[0038] Figure 7 It is a structural schematic diagram of a shaft alignment calculation system according to an embodiment of the present application.

[0039] Reference numerals:

[0040] 1. First drawing module; 2. Jack load acquisition module; 3. Equivalent lifting coefficient acquisition module; 4. Second drawing module; 5. Bearing load calculation module. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0043] See also Figure 1 The present application provides a method for calculating the load of a ship shafting bearing, comprising the following steps:

[0044] S1. Establish a calculation model, obtain the theoretical lifting curve of the jack based on the lifting method; obtain the jack load F corresponding to the top point of the theoretical lifting curve in the theoretical lifting curve JE .

[0045] S2. Obtain the theoretical equivalent jack load F according to the theoretical lifting curve in the theoretical lifting curve diagram J .

[0046] S3, according to the jack load F corresponding to the top empty point JE , Theoretical equivalent jack load F J And the lifting coefficient K is used to calculate the equivalent lifting coefficient K N .

[0047] In step S3, it is considered that it is difficult to obtain the headspace point in the measured lift curve diagram, and the accuracy of the headspace point position cannot be guaranteed. The headspace point position in the theoretical lift curve is determined, therefore, based on the theoretical lift curve, an equivalent point in the lift curve is found, and the relationship between the headspace point and the equivalent point is found according to the theoretical lift curve, so as to find the equivalent lift coefficient K N .

[0048] S4. The jack is set at the bottom of the shaft section near the ship shaft system bearing, and a measured jacking curve of the jack is obtained based on the jacking method.

[0049] S5. Obtain the actual equivalent jack load F according to the measured jacking curve in the measured jacking curve diagram J '; According to the equivalent lifting coefficient K N And the actual equivalent jack load F J ' Calculate the bearing load value and use this value as the bearing load at the ship shafting bearing.

[0050] In step S5, find the equivalent point in the measured lifting curve, and use the equivalent point to obtain the actual equivalent jack load F J ′, instead of first determining the top empty point and then obtaining the corresponding jack load F at the top empty point JE See also Figure 4 and Figure 5 The position of the top-lift point in the measured top-lift curve is not obvious. Considering the accuracy of calculating the bearing load, this application performs relevant calculations by selecting equivalent points in the measured top-lift curve.

[0051] The calculation method of the ship shaft bearing load provided by the application obtains the equivalent jack load, calculates the bearing load value based on the equivalent jack load, and uses this value as the bearing load at the ship shaft bearing. Compared with the prior art, it replaces the process of determining the top point of the measured jacking curve, and avoids the problem that the accuracy of the bearing load cannot be guaranteed due to the inaccurate position of the top point. The application can accurately calculate the bearing load, thereby avoiding affecting the accuracy of the ship shaft alignment calculation.

[0052] In one embodiment, see Figure 2 Based on the jacking method, a jack J is set at the bearing B to be tested, and the theoretical jacking curve of the jack J is obtained. Figure 3 The horizontal axis of the theoretical lifting curve represents the jack load, and the vertical axis represents the jack displacement. In the theoretical lifting curve, the theoretical lifting curve OCD includes the lifting section OC and the emptying section CD.

[0053] Specifically, the lifting section OC represents the relationship between the jack load and the jack displacement during the process of the tested bearing B and the jack J jointly supporting the rise or fall of the shaft system. The emptying section CD represents the relationship between the jack load and the jack displacement in the emptying stage after the tested bearing B is empty.

[0054] It should be noted that the theoretical lifting curve is the theoretical lifting curve of the jack without considering the viscosity effect.

[0055] In one embodiment, in step S1, the jack load F corresponding to the top point of the theoretical lifting curve in the theoretical lifting curve diagram is obtained. JE include:

[0056] The intersection of the lifting section and the emptying section is obtained as the emptying point of the theoretical lifting curve, and the corresponding jack load F at the emptying point is obtained according to the theoretical lifting curve. JE Considering that the top point of the theoretical top lift curve is relatively easy to determine, the equivalent top lift coefficient K N When the load is increased, the theoretical lift curve is used for relevant calculations.

[0057] In one embodiment, before step S1, ship shafting and bearing arrangement information and shafting alignment design information are obtained. Based on the ship shafting and bearing arrangement information, it is analyzed whether the bearing load is measurable, and the bearing load is calculated after it is determined that the bearing load is measurable.

[0058] Specifically, the ship shafting and bearing arrangement information includes: the designer imports a fixed data format data file used to describe the geometry, physics, structure, and arrangement of the ship shafting, and the computing platform analyzes the data file with a preset structure to extract the shafting shaft section and bearing structure form, structural dimensions, allowable load, weight center of gravity and other data;

[0059] The shaft alignment design information includes: the designer selects the ship shaft alignment design calculation, and the calculation platform analyzes the data file corresponding to the shaft alignment design calculation according to the preset data structure. Extract the shaft alignment related shaft segment diameter and length, material density, propeller weight center of gravity, flange, bearing size and bearing specific pressure and other shaft system accessory requirements.

[0060] In one embodiment, before step S1 , the position and number of the bearings to be measured in the shaft system are confirmed.

[0061] Specific examples include:

[0062] Obtain bearing type and bulkhead layout information. Analyze the geometry, physics, structural layout and shafting accessories of the ship based on the shafting and bearing layout information, analyze the bulkhead layout, equipment configuration, bearing position and hull structure near the bearing, and determine whether there is enough space near the bearing and whether the bearing is located in the bulkhead, that is, determine the accessibility of the bearing position and the adjustability of the bearing displacement. Determine the position and number of the bearings to be tested based on the accessibility of the bearing position and the adjustability of the bearing displacement. Determine the position and number of the jacks based on the position and number of the bearings to be tested and the geometry, layout and shafting accessories of the shafting.

[0063] In one embodiment, the number of jacks corresponds to the number of bearings to be tested.

[0064] In one embodiment, determining that the bearing load is measurable includes:

[0065] The bearing position and the hull structure near the bearing are obtained based on the ship shaft alignment design information. According to the bearing position and the hull structure near the bearing, it is determined that there is enough space to arrange the jack near the measured bearing, and the bearing load at the measured bearing can be measured.

[0066] It should be noted that: usually all intermediate bearing loads can be measured. If there is limited space on one side of the intermediate bearing, a jack can be arranged on the other side.

[0067] In one embodiment, in step S2, the theoretical equivalent jack load F is obtained. J Including: extending the empty section CD of the theoretical jacking curve in the reverse direction and intersecting it with the horizontal axis, obtaining the corresponding jack load at the intersection as the equivalent jack load F J . Consider the intersection point as an equivalent point to the headspace point.

[0068] In one embodiment, in step S3, the equivalent lifting coefficient K is calculated. N The following steps are involved:

[0069] See also Figure 3 The slope of the straight line where the empty segment CD lies is A JJ ′ is the reaction force coefficient of the jack on the tested bearing after it is jacked up. Figure 2 The theoretical lifting curve in is:

[0070] F J =F JE -Y JE ×A ′ JJ (1)

[0071]

[0072] According to formula (1) and formula (2), we can get:

[0073]

[0074] According to the ship industry standards and the corresponding jack load F at the top point JE , obtain the bearing load F of the tested bearing B B for:

[0075] F B =K×F JE (4)

[0076] The lifting coefficient K is a value determined based on the shipbuilding industry standard:

[0077]

[0078] Where:

[0079] A BJ is the reaction force influence coefficient of the jack J on the measured bearing B;

[0080] A JJ is the reaction force influence coefficient of the jack J on itself.

[0081] According to formula (3), formula (4) and formula (5), we can get:

[0082]

[0083] The bearing load F of the measured bearing B B Denoted as:

[0084] F B =K N ×F J (7)

[0085] According to formula (7), the equivalent lifting coefficient K is obtained N for:

[0086]

[0087] In one embodiment, see Figure 4 The horizontal axis of the measured lifting curve represents the jack load in KN, and the vertical axis represents the shaft displacement in mm. The measured lifting curve includes the lifting curve of the jack in the rising stage and the lifting curve of the jack in the descending stage. Based on the lifting curve of the rising stage and the lifting curve of the descending stage, the middle line of the two is obtained as the measured lifting curve of the jack. Considering the middle line of the two can increase the accuracy of the calculation.

[0088] Specifically, Figure 5 FIG. 1 is a measured uplift curve diagram of the bearing load of an actual ship. The dotted line portion represents the middle line obtained based on the uplift curve in the rising stage and the uplift curve in the descending stage.

[0089] In one embodiment, in step S4, arranging the jack at the bottom of the ship shafting bearing includes:

[0090] The jack is arranged according to the position of the ship shaft system bearing, the jack is arranged close to the ship shaft system bearing, and the jack is arranged on a strong gear near the ship shaft system bearing.

[0091] In one embodiment, in step S5, the actual equivalent jack load F is obtained. J 'include:

[0092] Extend the middle line of the measured lifting curve in the opposite direction and intersect it with the horizontal axis, and obtain the jack load corresponding to the intersection as the equivalent jack load F JConsidering that the top point of the measured top lift curve is not easy to determine, the intersection point of the middle line and the horizontal axis is obtained and the intersection point is used as the equivalent point of the calculation.

[0093] According to the second aspect of this application, see Figure 6 A system for calculating the bearing load of a ship shaft system is also provided, comprising: a first drawing module 1, a jack load acquisition module 2, an equivalent lifting coefficient acquisition module 3, a second drawing module 4 and a bearing load calculation module 5.

[0094] The first drawing module 1 is used to draw a theoretical lifting curve of the jack according to the lifting method. The jack load acquisition module 2 is used to obtain the jack load F corresponding to the top point of the theoretical lifting curve according to the theoretical lifting curve. JE and equivalent jack load F J The equivalent lifting coefficient acquisition module 3 is used to obtain the equivalent lifting coefficient K and the corresponding jack load F at the top point. JE and the equivalent jack load F J Get the equivalent lifting coefficient K N When the jack is arranged at the bottom of the shaft section near the ship shaft system bearing, the second drawing module 4 is used to draw the measured lifting curve of the jack according to the lifting method. The bearing load calculation module 5 is used to obtain the actual equivalent jack load F according to the measured lifting curve. J ′, according to the actual equivalent jack load F J ' and equivalent lifting coefficient K N The bearing load value is calculated. The bearing load value is used as the bearing load at the ship shafting bearing. The calculation system uses the calculation method in any of the above embodiments.

[0095] According to the third aspect of this application, see Figure 7 , a shafting alignment calculation system is also provided, including a shafting alignment calculation module, which is used to perform ship shafting alignment calculation according to the bearing load calculated by the ship shafting bearing load calculation system provided by the second aspect.

[0096] It should be noted that when calculating the alignment of the ship shafting, the shafting alignment calculation module is used to calculate the bearing load of each bearing in the shafting to confirm that each bearing load meets the alignment requirements.

[0097] Specifically, obtain the shafting design geometry, physics, accessory layout parameters and shafting accessory requirements. Analyze the shafting alignment characteristics and requirements based on the shafting geometry, physics, accessory layout parameters and accessory requirements and space requirements. The shafting alignment characteristics include the number of stern tube bearings, coupling characteristics and requirements, main engine output flange bending moment and shear requirements, etc. Analyze the bearing displacement and bearing load data information based on the ship shafting alignment design information to determine the rationality of the bearing displacement and bearing load information; the bearing displacement design should be easy to construct and effectively offset the impact of hull deformation. The bearing load value should not be greater than 80% of the maximum bearing load.

[0098] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for calculating the load on a ship shafting bearing, characterized in that: include: S1, a theoretical lifting curve of the jack is obtained based on the lifting method; Obtain the jack load F corresponding to the top point of the theoretical jacking curve in the theoretical jacking curve diagram JE ; S2, obtaining the theoretical equivalent jack load F according to the theoretical lifting curve in the theoretical lifting curve diagram J ; S3, according to the jack load F corresponding to the top empty point JE , the theoretical equivalent jack load F J And the lifting coefficient K is used to calculate the equivalent lifting coefficient K N ; S4, setting the jack at the bottom of the shaft section near the ship shaft system bearing, and obtaining a measured jacking curve of the jack based on the jacking method; S5, obtaining the actual equivalent jack load F according to the measured jacking curve in the measured jacking curve diagram J '; According to the equivalent lifting coefficient K N And the actual equivalent jack load F J ' Calculate the bearing load value and use this value as the bearing load at the ship shafting bearing.

2. The method for calculating the ship shafting bearing load according to claim 1, characterized in that: The abscissa of the theoretical jacking curve diagram represents the jack load, and the ordinate represents the jack displacement; in the theoretical jacking curve diagram, the theoretical jacking curve includes a jacking section and a lifting section; In step S2, the theoretical equivalent jack load F is obtained. J include: The empty section of the theoretical jacking curve is extended in the reverse direction and intersected with the abscissa, and the jack load corresponding to the intersection is obtained as the equivalent jack load F J .

3. The method for calculating the ship shafting bearing load according to claim 2, characterized in that: The horizontal axis of the measured lifting curve diagram represents the jack load, and the vertical axis represents the shaft displacement; the measured lifting curve diagram includes a lifting curve in the rising stage and a lifting curve in the descending stage of the jack; the middle line of the lifting curve in the rising stage and the lifting curve in the descending stage is obtained, and the middle line is used as the measured lifting curve of the jack.

4. The method for calculating the ship shafting bearing load according to claim 3, characterized in that: In step S5, the actual equivalent jack load F is obtained. J 'include: The middle line of the measured lifting curve is extended in the reverse direction and intersects with the horizontal coordinate; the jack load corresponding to the intersection is obtained as the equivalent jack load F J ′.

5. The method for calculating the ship shafting bearing load according to claim 3, characterized in that: In step S1, the jack load F corresponding to the top point of the theoretical jacking curve in the theoretical jacking curve diagram is obtained. JE include: The intersection of the jacking section and the emptying section is obtained as the emptying point of the theoretical jacking curve, and the jack load F corresponding to the emptying point is obtained according to the theoretical jacking curve. JE .

6. The method for calculating the ship shafting bearing load according to claim 5, characterized in that: The lifting section indicates the relationship between the jack load and the jack displacement during the stage when the tested bearing and the jack jointly support the shaft system; the emptying section indicates the relationship between the jack load and the jack displacement during the emptying stage after the tested bearing is empty.

7. The method for calculating the ship shafting bearing load according to claim 1, characterized in that: In step S4, the step of arranging the jack at the bottom of the shaft section near the ship shafting bearing comprises: The jack is arranged according to the position of the ship shaft system bearing, the jack is arranged close to the ship shaft system bearing, and the jack is arranged on a strong gear near the ship shaft system bearing.

8. The method for calculating the ship shafting bearing load according to any one of claims 1 to 7, characterized in that: The theoretical lifting curve is a theoretical lifting curve of the jack without considering the viscosity effect.

9. A system for calculating the load on a ship shafting bearing, characterized in that: include: The first drawing module is used to draw a theoretical lifting curve diagram of the jack according to the lifting method; The jack load acquisition module is used to obtain the jack load F corresponding to the top point of the theoretical jacking curve according to the theoretical jacking curve. JE and equivalent jack load F J ; The equivalent lifting coefficient acquisition module is used to obtain the equivalent lifting coefficient K and the corresponding jack load F at the top point. JE and the equivalent jack load F J Get the equivalent lifting coefficient K N ; The second drawing module is used to draw a measured jacking curve diagram of the jack according to the jacking method when the jack is arranged at the bottom of the shaft section near the ship shafting bearing; The bearing load calculation module is used to obtain the actual equivalent jack load F according to the measured lifting curve diagram. J ′, according to the actual equivalent jack load F J ' and equivalent lifting coefficient K N Calculate the bearing load value; use the bearing load value as the bearing load at the ship shaft system bearing.

10. A shaft alignment calculation system, characterized in that: It comprises a shafting alignment calculation module, which is used to perform ship shafting alignment calculation according to the bearing load calculated by the ship shafting bearing load calculation system according to claim 9.

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