A method for building a sea simulation experiment system suitable for a pod propeller

Abstract

The present application relates to the technical field of pod propeller performance simulation test, and particularly relates to a method for building a sea simulation experiment system suitable for a pod propeller, which comprises the following steps: manufacturing a pod propeller and an external hanging bearing platform according to engineering blueprints respectively; supporting the pod propeller on the external hanging bearing platform and connecting and fixing the same as a whole; cooperating a hoisting device and a hoisting tool to hoist the external hanging bearing platform, and then performing a pre-welding positioning operation; welding the external hanging bearing platform and a barge as a whole; moving the barge to open water and performing a full-range mooring operation. In this way, on the one hand, the built sea simulation experiment system of the pod propeller is basically consistent with the actual sailing working condition, so that the obtained performance parameters of the pod propeller are more real and reliable; on the other hand, the simulation loading speed and positioning accuracy of the pod propeller are effectively ensured, and the one-time hoisting success rate is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of podded propeller performance simulation test, and particularly relates to a method for building a sea simulation test system suitable for a podded propeller. BACKGROUND

[0002] The propeller is an important component in the ship power equipment. The podded propeller is the best of the best, which has the technical advantages of high-efficiency electric propulsion, small vibration and small pollution, and thus has been applied to the diving operation supply ship, the oil drilling platform, the supply ship, the shuttle tanker, the roll-on / roll-off ship, the icebreaker and the part of the military ship.

[0003] The podded propeller, also known as the POD propeller, is a new type of ship propelling device integrating the propelling and steering devices. The podded propeller places the propelling motor outside the cabin and directly connects with the propeller, which can rotate horizontally within 360° to realize the vector propelling.

[0004] After the podded propeller is manufactured, the performance parameters thereof need to be tested before being formally installed on the ship, so that the selection requirements of the installation on the ship are met, and the podded propeller is better pushed to the broad market. In the prior art, the simulation performance test is usually carried out in a closed water area, for example, a large water pool is excavated on the experimental site, and then the podded propeller is immersed in the water pool. Although most of the performance parameters (such as the power output condition of the propelling motor and the driving device thereof, and the self-excited vibration parameters) can be detected, the real feedback of some performance parameters (such as the hydrodynamic and load performance) cannot be obtained, and the actual application working condition of the podded propeller is the open water area, so that the podded propeller which is qualified in the simulation test cannot meet the acceptance requirements after being installed on the ship, or the podded propeller frequently fails after being applied for a period of time. In addition, a large amount of manpower and material resources need to be invested for excavating the large water pool, the experimental cost is high, and a large amount of production land needs to be occupied, and thus the above problems need to be solved by technical personnel. SUMMARY

[0005] Therefore, the designers of the present application collect relevant data, continuously experiment and modify through the years of research and development experience of the technical personnel in the industry, and finally lead to the emergence of the method for building the sea simulation test system suitable for the podded propeller.

[0006] In order to solve the above technical problems, the present application relates to a method for building a sea simulation test system suitable for a podded propeller, the podded propeller is applied to the polar environment, and the rated power thereof is not less than 5 MW. The method for building the sea simulation test system suitable for the podded propeller comprises the following steps:

[0007] S1, manufacturing the pod propeller according to the engineering blueprint;

[0008] S2, manufacturing the external load-carrying platform according to the engineering blueprint, for connecting and transitioning between the pod propeller and the barge;

[0009] S3, supporting the pod propeller on the external load-carrying platform, and connecting and fixing them as a whole;

[0010] S4, the hoisting equipment and hoisting tool cooperate to hoist the external load-carrying platform, and then perform the pre-welding positioning operation;

[0011] S5, welding the external load-carrying platform and the barge as a whole;

[0012] S6, moving the barge to open water, and performing all-around mooring operation.

[0013] As a further improvement of the technical scheme of the application, in step S2, the external load-carrying platform includes a support platform, a connecting transition truss, and a lifting lug unit. The support platform, which directly bears the pod propeller, has a box body structure and an avoidance gap for the pod propeller to pass through freely along the thickness direction. The connecting transition truss is used as the connection and transition between the support platform and the barge, and is welded with the support platform in the welding workshop. The lifting lug unit is applied in cooperation with the hoisting tool and is borne by the support platform.

[0014] As a further improvement of the technical scheme of the application, the lifting lug unit is composed of a first lifting lug sub-unit and a second lifting lug sub-unit. The first lifting lug sub-unit is composed of a plurality of first lifting lugs arranged on one side of the avoidance gap and linearly arrayed. The second lifting lug sub-unit is arranged on the other side of the avoidance gap and is composed of a plurality of second lifting lugs linearly arrayed and corresponding to the first lifting lugs. The first lifting lugs and the second lifting lugs are hidden in the inner cavity of the support platform. Opposite to the first lifting lugs and the second lifting lugs, a lifting process gap is formed on the cover plate of the support platform for the lifting wire rope and the shackle to pass through.

[0015] As a further improvement of the technical scheme of the application, a plurality of auxiliary support plates are welded in the inner cavity of the support platform and are circumferentially and uniformly distributed around the avoidance gap.

[0016] As a further improvement of the technical scheme of the application, in step S4, according to different actual application scenarios, the hoisting equipment can be any one of a gantry crane, a truck crane, or a floating crane, and the rated lifting weight is not less than 200T.

[0017] As a further improvement of the technical scheme of the present application, in step S4, the lifting tool is a multi-stage balanced beam structure, and comprises a first balanced beam, a left second balanced beam, a right second balanced beam, and four groups of suspension lifting arm assemblies. The first balanced beam is formed with a lifting lug plate assembly for being directly pulled by the lifting device. The left second balanced beam and the right second balanced beam are both assembled on the first balanced beam, and are symmetrically arranged along the left-right direction. The four groups of suspension lifting arm assemblies are all used for suspending the lifting wire, and cooperatively realize the lifting operation of the outer hanging load-carrying platform together with the pod propeller, wherein, two groups of suspension lifting arm assemblies are hingedly connected with the left second balanced beam, and are symmetrically arranged along the left-right direction, and the remaining two groups of suspension lifting arm assemblies are hingedly connected with the right second balanced beam, and are also symmetrically arranged along the left-right direction. In the process of performing the lifting operation, each suspension lifting arm assembly performs adaptive yawing movement due to different pulling forces, and at the same time, the left second balanced beam and the right second balanced beam also perform adaptive yawing movement due to the pulling action of the suspension lifting arm assemblies applied thereto.

[0018] As a further improvement of the technical scheme of the present application, the suspension lifting arm assembly comprises a connecting rod, a mounting seat, and a pulley. The connecting rod is directly hingedly connected with the left second balanced beam or the right second balanced beam. The mounting seat is assembled with the connecting rod as a whole, and can freely perform yawing movement along the left-right direction when subjected to a rotational torque. The pulley is directly wound by the lifting wire, is assembled on the mounting seat, and freely performs circumferential rotation movement about the central axis thereof due to the friction force from the lifting wire.

[0019] As a further improvement of the technical scheme of the present application, the suspension lifting arm assembly further comprises a thrust bearing. An installation cavity for accommodating the thrust bearing is formed in the mounting seat. The connecting rod is inserted into the mounting seat and extends into the installation cavity. A blocking flange matched with the thrust bearing is formed on the connecting rod around the circumferential side wall thereof.

[0020] As a further improvement of the technical scheme of the present application, the first balanced beam is formed with a pulling lug plate assembly for suspending the lifting wire, and the pulling lug plate assembly is oppositely arranged along the up-down direction with the lifting lug plate assembly.

[0021] In actual application, the above-mentioned method for building the offshore simulation experiment system for the pod propeller at least has the following beneficial effects:

[0022] 1) The pod propeller is assembled on the experimental barge by means of the outer hanging load-carrying platform, and is wholly parked in the open water, so as to ensure that the built offshore simulation experiment system for the pod propeller is consistent with the actual navigation working condition, and ensure the authenticity and reliability of the performance parameters obtained by testing, and facilitate timely detection of design defects and performance defects of the pod propeller;

[0023] 2) The pod propeller and the external load-carrying platform are assembled as a whole in the field, and then the whole is hoisted to the tail of the barge by hoisting equipment. In this way, the simulation loading speed and positioning accuracy of the pod propeller are greatly improved, and the one-time hoisting success rate is extremely high. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a process schematic diagram of the process of assembling the pod propeller and the external load-carrying platform as a whole in the construction method of the offshore simulation experiment system suitable for the pod propeller.

[0026] Figure 2 is a process schematic diagram of the process of loading the pod propeller and the external load-carrying platform as a whole in the construction method of the offshore simulation experiment system suitable for the pod propeller.

[0027] Figure 3 is a state schematic diagram of the process of the pod propeller and the external load-carrying platform being cooperatively lifted by multiple hoisting tools as a whole in the construction method of the offshore simulation experiment system suitable for the pod propeller (the pod propeller is hidden).

[0028] Figure 4 is a three-dimensional schematic diagram of the external load-carrying platform in the construction method of the offshore simulation experiment system suitable for the pod propeller.

[0029] Figure 5 is a structural schematic diagram of the hoisting tool in the construction method of the offshore simulation experiment system suitable for the pod propeller.

[0030] Figure 6 is a structural schematic diagram of the suspension boom assembly involved in the hoisting tool.

[0031] 1 - podded propeller; 2 - external load-carrying platform; 21 - support platform; 211 - avoidance gap; 212 - hoisting process gap; 213 - auxiliary support plate; 22 - connecting transition truss; 23 - lifting lug unit; 231 - first lifting lug subunit; 2311 - first lifting lug; 232 - second lifting lug subunit; 2321 - second lifting lug; 3 - support pier; 4 - hoisting tool; 41 - primary balance beam; 411 - hoisting lug plate assembly; 412 - pulling lug plate assembly; 42 - left secondary balance beam; 43 - right secondary balance beam; 44 - suspension boom assembly; 441 - connecting rod; 4411 - blocking flange; 442 - mounting seat; 4421 - mounting cavity; 443 - pulley; 444 - thrust bearing; 5 - barge. DETAILED DESCRIPTION

[0032] According to the content of the project specification, the podded propeller involved in the present application, which is to be subjected to performance parameter simulation testing, is expected to be applied in a polar environment, and its rated power is not less than 5 MW.

[0033] The content disclosed in the present application will be further described in detail below in combination with specific embodiments, such as shown in Figs. Figure 1 , 2 , 3, the construction method of the offshore simulation experiment system suitable for the podded propeller includes the following steps:

[0034] S1, manufacturing the podded propeller 1 according to the engineering blueprint;

[0035] S2, manufacturing the external load-carrying platform 2 according to the engineering blueprint for connecting and transitioning between the podded propeller 1 and the barge 5;

[0036] S3, supporting the podded propeller 1 on the external load-carrying platform 2, and connecting and fixing them as a whole;

[0037] S4, the hoisting equipment (not shown in the figure) and the hoisting tool 4 cooperate to hoist the external load-carrying platform 2, and then perform the pre-welding positioning operation; and according to the different actual application scenarios, the hoisting equipment can be selected from any one of a portal crane, a truck crane or a floating crane, and the rated hoisting weight is not less than 200T;

[0038] S5, welding the external load-carrying platform 2 and the barge 5 as a whole;

[0039] S6, moving the barge 5 to open water, and performing all-around mooring operation, and then testing various performance parameters thereof.

[0040] In actual application, the construction method of the offshore simulation experiment system suitable for the podded propeller at least achieves the following beneficial effects:

[0041] 1) The pod propeller 1 is assembled on the experimental barge 5 by means of the external carrying platform 2, and is wholly berthed into open water, so as to ensure that the built pod propeller sea simulation experiment system is consistent with the actual navigation working condition, and to ensure the authenticity and reliability of the performance parameters obtained by testing, and to facilitate timely detection of design defects and performance defects of the pod propeller 1.

[0042] 2) The pod propeller 1 and the external carrying platform 2 are assembled in the field, and then hoisted by hoisting equipment to the tail of the barge 5, so that the simulation loading speed and positioning accuracy of the pod propeller 1 are greatly improved, and the one-time hoisting success rate is extremely high.

[0043] It is known that according to the design common sense, the external carrying platform 2 can adopt various design structures to realize reliable bearing of the pod propeller 1 and reliable connection with the barge 5, but a design structure simple and easy to manufacture and implement is recommended, as follows: as shown in Figure 4 The external carrying platform 2 is mainly composed of a support platform 21, a connecting transition truss 22 and a lifting lug unit 23. The support platform 21 for directly bearing the pod propeller 1 is in a box type structure, and an avoidance gap 211 is provided in the thickness direction thereof for the pod propeller 1 to pass through freely. The connecting transition truss 22 is a connecting transition between the support platform 21 and the barge 5, and is welded with the support platform 21 in the welding workshop. The lifting lug unit 23 matched with the lifting tool 4 is borne by the support platform 21.

[0044] It should be noted that when the support platform 21 is welded in place relative to the barge 5 (meaning that the pod propeller 1 is loaded), the connecting transition truss 22 can be cut off or retained according to the weight and power of the pod propeller 1 to be tested. Generally, when the weight of the pod propeller 1 to be tested is greater than 20T, and the rated power is greater than 10 megawatt, the connecting transition truss 22 is preferably retained to ensure the safety of the simulation.

[0045] Furthermore, the external carrying platform 2 is provided with a plurality of lifting lug units 23, and the lifting lug units 23 are arranged in a staggered manner. Figure 4It can also be clearly seen in the figure that the lifting lug unit 23 is preferably composed of a first lifting lug sub-unit 231 and a second lifting lug sub-unit 232, wherein the first lifting lug sub-unit 231 is composed of four first lifting lugs 2311 arranged in a linear array on the rear side of the avoiding gap 211. The second lifting lug sub-unit 232 is arranged on the front side of the avoiding gap 211 and is composed of four second lifting lugs 2321 arranged in a linear array and corresponding to the first lifting lugs 2311. The first lifting lugs 2311 and the second lifting lugs 2321 are both hidden in the inner cavity of the support platform 21. Opposite the first lifting lugs 2311 and the second lifting lugs 2321, a lifting process gap 212 is provided on the cover plate of the support platform 21 for the lifting steel wire rope and the shackle to pass through. In this way, when the test pod propeller 1 is completed after the ship operation, because the first lifting lugs 2311 and the second lifting lugs 2321 are in a hidden state, they will not block or hinder the test personnel, so that it is possible for them to stay for a long time, thereby saving a lot of explosive cutting operation, which is beneficial to reduce the cost of simulation test experiment to a certain extent.

[0046] It is known that when the pod propeller 1 is completed after the ship operation, whether its own orientation is correct will directly affect the authenticity and accuracy of various performance test parameters. In view of this, as a further optimization of the above technical solution, as shown in the figure, Figure 4 As shown in the figure, a plurality of auxiliary support plates 213 are welded in the inner cavity of the support platform 21 and are circumferentially distributed around the avoiding gap 211. In this way, when the pod propeller 1 is fixed relative to the support platform 21, due to the cooperative top supporting effect of each auxiliary support plate 213, the plastic deformation phenomenon of the cover plate of the auxiliary support plate 213 due to excessive pressure can be effectively avoided, thereby ensuring that the pod propeller 1 relative to the barge 5 always maintains correct positioning for a long period of time.

[0047] As shown in the figure, Figure 5As shown in the drawings, the lifting tool 4 is preferably a multi-stage balanced beam structure, and comprises a first-stage balanced beam 41, a left second-stage balanced beam 42, a right second-stage balanced beam 43, and four sets of suspension lifting arm assemblies 44. The first-stage balanced beam 41 is formed with a lifting lug assembly 411 for being directly pulled by the lifting device, and a pulling lug assembly 412. The pulling lug assembly 412 is used for suspending the lifting wire rope, and is oppositely arranged with the lifting lug assembly 411 along the up-down direction. The left second-stage balanced beam 42 and the right second-stage balanced beam 43 are both assembled on the first-stage balanced beam 41, and are oppositely symmetrical along the left-right direction. The four sets of suspension lifting arm assemblies 44 are all used for suspending the lifting wire rope, and are cooperated to realize the lifting operation of the external hanging load-carrying platform 2 together with the pod thruster 1. Among them, two sets of suspension lifting arm assemblies 44 are both hingedly connected with the left second-stage balanced beam 42, and are oppositely symmetrical along the left-right direction, and the remaining two sets of suspension lifting arm assemblies 44 are both hingedly connected with the right second-stage balanced beam 43, and are also oppositely symmetrical along the left-right direction. In the process of performing the lifting operation, each suspension lifting arm assembly 44 performs adaptive deflection movement due to the different pulling forces, while the left second-stage balanced beam 42 and the right second-stage balanced beam 43 also perform adaptive deflection movement due to the pulling action of the suspension lifting arm assemblies 44 applied thereto. In this way, the lifting load is adaptively and optimally distributed among the suspension lifting arm assemblies 44, which not only helps to ensure that the pod thruster 1 together with the external hanging load-carrying platform 2 can be stably and safely lifted, but also effectively ensures that the pod thruster 1 always remains in a horizontal state during the lifting process, which is beneficial to the subsequent precise positioning with the barge 5.

[0048] As a further optimization of the above technical solution, as shown in the drawings, Figure 6 As shown in the drawings, the suspension lifting arm assembly 44 preferably comprises a connecting rod 441, a mounting seat 442, and a pulley 443. The connecting rod 441 is directly hingedly connected with the left second-stage balanced beam 42 or the right second-stage balanced beam 43. The mounting seat 442 is assembled with the connecting rod 441 as a whole, and can freely perform deflection movement along the left-right direction when subjected to a rotational torque. The pulley 443 is directly wound by the lifting wire rope, and is assembled on the mounting seat 442, and can freely perform circumferential rotation movement about its central axis due to the frictional force from the lifting wire rope. When the lifting wire rope is pulled, it can adaptively distribute the pulling lengths on both sides according to the real-time pulling forces on the two free ends. In this way, not only the pulling working condition of the lifting wire rope is effectively optimized, but also the stress state of the pulley 443 is optimized, thereby ensuring a longer service life.

[0049] As shown in the drawings, Figure 6It can also be clearly seen from the drawings that the suspension boom assembly 44 is additionally provided with a thrust bearing 444. An installation cavity 4421 for accommodating the thrust bearing 444 is formed in the installation seat 442. The connecting rod 441 is inserted into the installation seat 442 and extends into the installation cavity 4421. A blocking flange 4411 adapted to the thrust bearing 444 is formed on the connecting rod 441 around the circumferential side wall thereof. In this way, when the pulley 443 is in a pulled state, the installation seat 442 can adaptively rotate in a circumferential direction, thereby effectively avoiding the entanglement of the hoisting steel wire rope due to unreasonable pulling.

[0050] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for building a sea simulation experiment system suitable for a podded propulsor, the podded propulsor being applied to a polar environment and having a rated power of not less than 5 MW, characterized in that, The method comprises the following steps: S1, manufacturing a pod propeller according to an engineering blueprint; S2, manufacturing an external load-carrying platform according to an engineering blueprint to connect and transition between the pod propeller and the barge; the external load-carrying platform comprises a support platform, a connecting and transitioning truss, and a lifting lug unit; the support platform for directly bearing the pod propeller is in a box-shaped structure and has an avoidance gap for the pod propeller to freely pass through along the thickness direction thereof; the connecting and transitioning truss is used as the connecting and transitioning between the support platform and the barge and is welded with the support platform in a welding workshop; the lifting lug unit matched with a lifting tool is borne by the support platform; The lifting lug unit is composed of a first lifting lug subunit and a second lifting lug subunit; the first lifting lug subunit is composed of a plurality of first lifting lugs arranged on one side of the avoidance gap and linearly arrayed; the second lifting lug subunit is arranged on the other side of the avoidance gap and is composed of a plurality of second lifting lugs linearly arrayed and corresponding to the first lifting lugs; the first lifting lugs and the second lifting lugs are hidden in the inner cavity of the support platform; a lifting process gap for lifting steel wire ropes and shackles to pass through is formed in the cover plate of the support platform opposite to the first lifting lugs and the second lifting lugs; A plurality of auxiliary support plates are welded in the inner cavity of the support platform and are circumferentially and uniformly distributed around the avoidance gap; S3, the pod propeller is borne on the external load-carrying platform and is connected and fixed as a whole; S4, a lifting device and a lifting tool cooperate to lift the external load-carrying platform, and then perform a pre-welding positioning operation; the lifting device is any one of a gantry crane, a truck crane, or a floating crane, and the rated lifting weight is not less than 200T; S5, the external load-carrying platform is welded with the barge as a whole; S6, the barge is moved to an open water area to perform a full-range mooring operation to simulate actual sailing conditions to test the performance of the pod propeller; The mooring operation in the open water area exposes the pod propeller to the real marine environment for detecting hydrodynamic and load performance parameters.

2. The method according to claim 1, wherein the system is used for the experiment of the pod propeller. In step S4, the lifting tool is a multi-stage balanced beam structure, and includes a first balanced beam, a left second balanced beam, a right second balanced beam, and four groups of suspension lifting arm assemblies; the first balanced beam is formed with a lifting lug assembly for being directly pulled by the lifting device; the left second balanced beam and the right second balanced beam are both assembled on the first balanced beam and are symmetrically arranged along the left-right direction; the four groups of suspension lifting arm assemblies are used to suspend the steel wire ropes and cooperatively realize the lifting operation of the outer hanging load-carrying platform together with the nacelle propeller, wherein two groups of the suspension lifting arm assemblies are hingedly connected with the left second balanced beam and are symmetrically arranged along the left-right direction, and the remaining two groups of the suspension lifting arm assemblies are hingedly connected with the right second balanced beam and are also symmetrically arranged along the left-right direction; in the process of performing the lifting operation, each suspension lifting arm assembly performs adaptive yawing movement due to different pulling forces, and at the same time, the left second balanced beam and the right second balanced beam also perform adaptive yawing movement due to the pulling action of the suspension lifting arm assemblies applied thereto.

3. The method according to claim 2, wherein the system is used for the installation of a marine simulation experiment system for a pod propeller. The suspension lifting arm assembly includes a connecting rod, a mounting seat, and a pulley; the connecting rod is directly hingedly connected with the left second balanced beam or the right second balanced beam; the mounting seat is assembled with the connecting rod and can freely perform yawing movement along the left-right direction when subjected to a rotational moment; the pulley is directly wound by the lifting steel wire rope, is assembled on the mounting seat, and freely performs circumferential rotation around the central axis thereof due to the friction force from the lifting steel wire rope.

4. The method according to claim 3, wherein, The suspension lifting arm assembly further includes a thrust bearing; the mounting seat is formed with a mounting cavity for accommodating the thrust bearing; the connecting rod is inserted into the mounting seat and extends into the mounting cavity; a blocking flange matched with the thrust bearing is formed on the circumferential side wall of the connecting rod.

5. The method of claim 2, wherein the method further comprises: The first balanced beam is formed with a pulling lug assembly for suspending the lifting steel wire rope and oppositely arranged with the lifting lug assembly along the up-down direction.

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