Design method of SPMT module vehicle

Abstract

The invention provides a design method of an SPMT module vehicle. The design method comprises the steps that S1, information of a ship block is acquired; s2, vehicle pre-allocation is carried out according to the ship information, and whether the number of axes of an SPMT module vehicle meets the requirement or not is determined; s3, whether the SPMT module vehicle needs to be provided with a reinforcing structure or not is determined; s4, the shearing force and the bending moment of each pressure-bearing wood are obtained; and the shearing force and the bending moment of each pressure-bearing wood are compared with the allowable shearing force and the allowable hogging moment of the vehicle plate of the SPMT module vehicle, and the pressure-bearing wood is adjusted according to the comparison result. The position of the ship block on the SPMT module vehicle and the position of the pressure bearing wood can be adjusted, deformation, caused by axle load, shearing force and bending moment, of a certain position of the vehicle plate can be effectively reduced, the stability and safety of the SPMT module vehicle for transporting the huge block are improved, the shortage of site resources is indirectly relieved, and the hoisting risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of roll-on / roll-off ship construction, and in particular to a design method for a SPMT module vehicle. Background Art

[0002] With the rapid development of ship engineering and the current new shipbuilding model, the weight, volume and center of gravity height of the sections and blocks of giant ships are increasing. Especially in recent years, maritime transportation has become increasingly frequent. The shipbuilding industry is facing great challenges, and the maximum and rational use of shipyard sites has become increasingly important.

[0003] In order to solve the problem of tight core resources on site, self-propelled modular transporters (SPMT modular vehicles for short) are used for roll-on / roll-off ships. This allows the ship's section structure to be built in non-core factory areas, reducing the operating frequency of the gantry crane and the high risk of lifting.

[0004] When the SPMT modular vehicle is transporting giant ship sections and other structures weighing thousands of tons and hundreds of meters long, the stress concentration on the vehicle plate causes the structure made of brittle materials on the SPMT modular vehicle to reach critical stress or even exceed the yield limit of the material, resulting in static load fracture, which further affects the safe transportation of the ship sections.

[0005] In the prior art, in order to reduce the deformation of the SPMT module car plate during the transportation of ship sections, a hard pressure-bearing wood or a pre-installed transport frame is used between the SPMT module car plate and the giant ship section (referred to as the ship section). However, the placement of the pressure-bearing wood is not fixed. If it is placed at a weak position of the car plate, it will cause the deformation of a certain part of the car plate to exceed the reasonable range, increase the adjustment pressure of the hydraulic lifting suspension of the SPMT module car, and may cause the vehicle to stop suddenly or be damaged, etc., and the safety and stability of the SPMT roll-on / roll-off ship cannot be guaranteed.

[0006] 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

[0007] The purpose of the embodiment of the present application is to provide a design method for an SPMT modular vehicle, which reduces the flexural deformation of the vehicle plate of the SPMT modular vehicle by adjusting the center of gravity position of the ship section and optimizing the placement position of the pressure-bearing wood, thereby ensuring the stability and safety of the transportation of the ship section.

[0008] The present application provides a design method for a SPMT module vehicle, comprising the following steps:

[0009] S1. Obtain the information of the ship's total section;

[0010] S2. Pre-allocate the vehicle according to the ship information and determine whether the number of SPMT module vehicle axles meets the requirements;

[0011] S3, obtaining the resultant external force on the horizontal plane of the SPMT module vehicle during transportation and the static friction of the SPMT module vehicle; comparing the resultant external force with the static friction, and determining whether the SPMT module vehicle needs to be provided with a reinforcement structure according to the comparison result;

[0012] S4. Establish a coordinate system based on the vehicle allocation information, obtain the front support point axial pressure P2 and the rear support point axial pressure P1 of the SPMT modular vehicle based on the coordinate system, and obtain the shear force and bending moment of each pressure-bearing wood based on the front support point axial pressure P2 and the rear support point axial pressure P1; compare the shear force and bending moment of each pressure-bearing wood with the allowable shear force and allowable negative bending moment of the vehicle panel of the SPMT modular vehicle, adjust the pressure-bearing wood according to the comparison results until the requirements are met, and complete the design of the SPMT modular vehicle.

[0013] In one implementable manner, in step S2, at least it includes: determining the actual carrying capacity of the SPMT modular vehicle based on the vehicle allocation information, the actual carrying capacity is less than or equal to 80% of the rated axle load, determining the minimum number of axes n based on the actual carrying capacity, comparing the actual number of axes with the minimum number of axes n, and meeting the requirements when the actual number of axes is less than or equal to the minimum number of axes n.

[0014] In one practicable manner, the resultant external force includes at least wind load, braking force, dynamic load, ramp force, and centrifugal force.

[0015] In an practicable manner, the forward direction of the SPMT module vehicle is defined as the X direction, and the direction perpendicular to the X direction on the horizontal plane is the Y direction; the resultant external force on the horizontal plane includes the resultant external force in the X direction and the resultant external force in the Y direction.

[0016] In one practicable manner, in step S3, providing the reinforcement structure includes: welding and fixing the ship section to the transfer bracket of the SPMT module vehicle.

[0017] In one practicable manner, in step S3, providing the reinforcement structure includes: providing a counterweight on the transfer bracket of the SPMT module vehicle.

[0018] In an practicable manner, the front support point axial pressure P2 and the rear support point axial pressure P1 should both be less than or equal to 80% of the rated axial load of the SPMT.

[0019] In one practicable manner, in step S4, when the shear force and negative bending moment are less than the allowable shear force and allowable negative bending moment of the vehicle plate of the SPMT modular vehicle, and the front support point axial pressure P2 and the rear support point axial pressure P1 are both less than or equal to 80% of the SPMT rated axle load, the vehicle configuration plan of the SPMT modular vehicle is confirmed.

[0020] In one practicable manner, when the shear force and negative bending moment are less than the allowable shear force and allowable negative bending moment of the vehicle panel of the SPMT module vehicle, and the front support point axial pressure P2 and the rear support point axial pressure P1 are both greater than 80% of the SPMT rated axle load, the position of the pressure-bearing wood at the maximum shear force and bending moment is adjusted until the front support point axial pressure P2 and the rear support point axial pressure P1 are both less than or equal to 80% of the SPMT rated axle load.

[0021] In one practicable manner, when the shear force and the negative bending moment are greater than the allowable shear force and the allowable negative bending moment of the SPMT car plate, the position of the pressure-bearing timber and the center of gravity of the ship section are adjusted.

[0022] In one practicable manner, in step S4, the adjustment measures at least include:

[0023] Move the center of gravity of the ship's total section to the side with smaller axial pressure between the forward support point axial pressure P2 and the rear support point axial pressure P1; or move the pressure-bearing wood at the maximum shear position; or move the pressure-bearing wood at the maximum bending moment position; or move the pressure-bearing wood at the maximum deflection.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] In the technical solution of the present application, the position of the ship section on the SPMT modular vehicle and the position of the pressure-bearing wood can be adjusted, which can effectively reduce the deformation of a certain part of the vehicle plate caused by axle load, shear force and bending moment, improve the stability and safety of the SPMT modular vehicle in transporting giant sections, indirectly alleviate the shortage of site resources, and reduce the risk of lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the design method of the SPMT module vehicle according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the axis in the design method of the SPMT module vehicle according to an embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the axis of the front support group in the design method of the SPMT module vehicle according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of pressure-bearing wood in the design method of the SPMT module vehicle according to an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the pressure-bearing wood of the front support group in the design method of the SPMT modular vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0035] See also Figures 1 to 5 The present application provides a design method for a SPMT module vehicle, comprising the following steps:

[0036] S1. Obtain the information of the ship's total section;

[0037] Specifically, it includes the structural weight, external outfit weight, iron outfit weight, electrical outfit weight and piping weight of the ship's total section, and calculates the overall weight distribution, length, width and height, and center of gravity coordinate position of the ship's total section.

[0038] S2. Pre-configure the vehicle according to the ship information and determine whether the number of SPMT module axles meets the requirements.

[0039] In an implementable manner, the actual load-bearing capacity β of the SPMT modular vehicle is determined based on the vehicle allocation information, and the actual load-bearing capacity β is less than or equal to 80% of the rated axle load. The minimum value n of the number of axes is determined based on the actual load-bearing capacity β, and the actual number of axes is compared with the minimum value n of the number of axes. When the actual number of axes is less than or equal to the minimum value n of the number of axes, the requirement is met. The formula for the actual load-bearing rate β is as follows:

[0040] G0=G(1+μ) (1)

[0041] β=(G0+G1+G2) / np≤80% (2)

[0042] Where:

[0043] G is the weight of the giant section;

[0044] G0 is the calculated weight of the giant segment;

[0045] μ is the giant section weight deviation coefficient;

[0046] β is the actual load factor of the SPMT module vehicle;

[0047] G1 is the weight of the SPMT axis;

[0048] G2 is the weight of the power module unit (Paralleling and Protection Unit, referred to as PPU);

[0049] n is the minimum number of axes;

[0050] p is the axle load of the SPMT module.

[0051] The actual number of axles after the vehicle is equipped should be greater than or equal to the minimum number of axles n, and the actual load-bearing capacity of the vehicle is less than or equal to 80% of the rated axle load. The specifications of the SPMT modular vehicle are determined and adjusted according to the minimum number of axles n, that is, the actual number of axles should be greater than or equal to n.

[0052] S3, obtaining the resultant external force on the horizontal plane of the SPMT module vehicle during transportation and the static friction of the SPMT module vehicle; comparing the resultant external force with the static friction, and determining whether the SPMT module vehicle needs to be provided with a reinforcement structure according to the comparison result.

[0053] In one practicable manner, the resultant external force includes at least wind load, braking force, dynamic load, ramp force, and centrifugal force.

[0054] In one practicable manner, in step S3, as Figure 1As shown, the forward direction of the SPMT modular vehicle is defined as the X direction, and the direction perpendicular to the X direction on the horizontal plane is the Y direction; the resultant external force on the horizontal plane includes the resultant external force in the X direction and the resultant external force in the Y direction. Obtaining the resultant external forces in the X direction and the Y direction of the SPMT modular vehicle transporting the giant total section includes the following:

[0055] S31. Obtain the wind load in the forward direction of the SPMT module vehicle and the wind load in the perpendicular forward direction.

[0056] S311. Obtain basic wind pressure:

[0057] q=0.5×ρ×V (3)

[0058] Where:

[0059] q is the basic wind pressure;

[0060] ρ is the air density;

[0061] V is the wind speed.

[0062] S312, respectively obtain the windward area A in the X direction x And the Y-direction frontal area A y .

[0063] A x =W×H (4)

[0064] A y =L×H (5)

[0065] Where:

[0066] L is the length of the ship's overall section;

[0067] W is the overall width of the ship;

[0068] H is the overall height of the ship.

[0069] S313, respectively obtaining the wind load in the X direction and the wind load in the Y direction during the transportation of the SPMT module vehicle.

[0070] F 1x =C×Kh×q×A x (6)

[0071] F 1y =C×Kh×q×A y (7)

[0072] Where:

[0073] F 1x is the wind load in the X direction;

[0074] F 1y is the wind load in the Y direction;

[0075] C is the wind load body shape coefficient;

[0076] Kh is the wind pressure height variation coefficient;

[0077] q is the basic wind pressure.

[0078] S32, respectively obtaining the braking force in the X direction and the braking force in the Y direction.

[0079] F 2x =G0×i 2x (8)

[0080] F 2y =G0×i 2y (9)

[0081] Where:

[0082] i 2x is the braking acceleration in the X direction;

[0083] i 2y is the braking acceleration in the Y direction;

[0084] F 2x is the braking acceleration in the X direction;

[0085] F 2y is the braking acceleration in the Y direction;

[0086] G0 is the calculated weight of the giant segment.

[0087] S33, respectively obtaining the dynamic load in the X direction and the dynamic load in the Y direction.

[0088] F 3x =G0×i 3x (10)

[0089] F 3y =G0×i 3y (11)

[0090] Where:

[0091] F 3x is the dynamic load in the X direction;

[0092] F 3y is the dynamic load in the Y direction;

[0093] i 3x is the dynamic acceleration in the X direction;

[0094] i 3y is the dynamic acceleration in the Y direction;

[0095] G0 is the calculated weight of the giant segment.

[0096] M is the wind vibration coefficient.

[0097] S34, respectively obtaining the ramp force in the X direction and the ramp force in the Y direction.

[0098] F 4x =G0×i 4x (12)

[0099] F 4y =G0×i 4y (13)

[0100] Where:

[0101] i 4x is the slope in the X direction;

[0102] i 4y is the slope in the Y direction;

[0103] G0 is the calculated weight of the giant segment.

[0104] S35. Calculate the centrifugal force in the Y direction.

[0105] F 5y =G0×V 2 / R (14)

[0106] Where:

[0107] V is the turning speed of the SPMT module vehicle;

[0108] R is the turning radius.

[0109] S36. Obtain the resultant external forces in the X and Y directions of the SPMT modular vehicle transporting the giant segment:

[0110] F 0x =F 1x +F 2x +F 3x +F 4x (15)

[0111] F 0y =F 1y +F 2y +F 3y +F 4y +F 5y (16)

[0112] In one practicable manner, in step S3, obtaining the static friction force of the SPMT module vehicle includes:

[0113] f=G0×u0 (17)

[0114] Where:

[0115] u0 is the static friction coefficient;

[0116] G0 is the calculated weight of the giant segment.

[0117] In one practicable manner, in step S3, when the static friction force f is less than or equal to the resultant external force F in the X direction, 0x The resultant external force F in the Y direction 0x 、F 0y and braking force F 2x 、F 2y When the ship is moving, sliding will occur between the ship block, the SPMT module car and the pressure-bearing wood. Therefore, a reinforcement structure is set on the SPMT module car.

[0118] In one practicable manner, providing the reinforcement structure includes: welding and fixing the ship section to the transfer bracket of the SPMT module vehicle.

[0119] In another practicable manner, providing the reinforcement structure includes: providing a counterweight on the transfer bracket of the SPMT module vehicle, and by providing the counterweight, the center of gravity height of the ship section is lowered to improve transfer safety.

[0120] S4. Establish a coordinate system based on the vehicle allocation information, obtain the front support point axial pressure P1 and the rear support point axial pressure P2 of the SPMT modular vehicle based on the coordinate system, and obtain the shear force and bending moment of each pressure-bearing wood based on the rear support point axial pressure P1 and the front support point axial pressure P2; compare the shear force and bending moment of each pressure-bearing wood with the allowable shear force and allowable negative bending moment of the vehicle panel of the SPMT modular vehicle, adjust the pressure-bearing wood according to the comparison results until the requirements are met, and complete the design of the SPMT modular vehicle.

[0121] In one practicable manner, if Figure 1 As shown, the lower end point O of the front side of the SPMT module is taken as the origin, and a coordinate system is established based on the X direction and the Y direction in step S3.

[0122] It should be noted that, in step S4, it is assumed that the ground is substantially flat, the component of pressure along the ground direction is ignored, and only the vertical component is considered.

[0123] In one practicable manner, if Figures 2 to 5 As shown, in step S4, the calculation process of the rear support point axial pressure P1 and the front support point axial pressure P2 is as follows:

[0124]

[0125] Where:

[0126] m1 is the number of axes of the rear support group;

[0127] n1 is the number of axes of the front support group.

[0128] Ni is the number of axes per SPMT module vehicle, such as Figure 1 As shown;

[0129] Ni" is the number of pressure-bearing wood in each SPMT module car, such as Figure 2 As shown;

[0130] G i is the axis weight;

[0131] G i " is the weight of the bearing wood;

[0132] L is the horizontal distance from the center of gravity of the ship section to the origin;

[0133] L i is the horizontal distance of each axis from the origin;

[0134] L i ' is the horizontal distance from the center of gravity of each axis to the origin;

[0135] L i " is the horizontal distance from the center of gravity of each bearing timber to the origin.

[0136] In one practicable manner, in step S4, when P1 and P2 are greater than 80% of the rated axle load of the SPMT, the stress information of multiple pressure-bearing timbers is analyzed in turn, and the stress information of the pressure-bearing timbers is compared with the allowable shear force and allowable negative bending moment of the vehicle panel of the SPMT modular vehicle, and the pressure-bearing timbers are adjusted according to the comparison results until the rear support point axial pressure P1 and the front support point axial pressure P2 are less than or equal to 80% of the rated axle load of the SPMT.

[0137] It should be noted that the SPMT module vehicle is divided into a port side and a starboard side based on the ship centerline L. In this embodiment, the starboard side is taken as an example for analysis.

[0138] Specifically, multiple pressure-bearing timbers are numbered from front to back along the ship section. As shown in the figure, multiple pressure-bearing timbers are numbered from left to right: N1", N2", ... Ni", and the corresponding axis numbers on each pressure-bearing timber are N1, N2, ... Ni, and the corresponding loads on each pressure-bearing timber are F N1" , F N2" …F Ni" As shown in the figure, the height direction of the SPMT module car is defined as the Z direction, and the load F on the pressure wood Ni" The directions of are parallel to the Z direction. And then F N1" +F N2" +…F Ni" =G0.

[0139] like Figure 4As shown, the distance from the front end to the rear end of the SPMT module car is L N" , the distance from the front end of the SPMT module car to the center of N1" and N2" is L N1" , the distance from the front end of the SPMT module car to the center of N2 and N3 is L N2" ..., the distance from the front end of the SPMT module car to the center of Ni-1" and Ni" is L Ni-1" , and L N1" +L N2" +…L Ni-1" =L N" .

[0140] The distance between the SPMT module axles is L", then the force on the first pressure-bearing wood N1 is:

[0141] F N1" =P1×Ni×L N1" / L N" (20)

[0142] The load of the first pressure-bearing wood:

[0143] F Ni" =Ni×L Ni-1" / L N" (twenty one)

[0144] P1×Ni×L N1" / L N" +P1×Ni×L N2" / L N" +…+P2×Ni×L Ni-1" / L N" =G0 (22)

[0145] Shear force F on the first bearing timber at position N1" sN1" It is equal to the number of axes Ni in front of N1" and the downward mutation of Ni SPMT modules, the axle pressure P1 plus the load F at the N1" position N1" , set the downward mutation to negative, that is, F sN1" =-Ni×P1+F N1" , the shear force F at the Ni" position sNi" =F sNi-1" -P2×(N i－1 -N i ), where N i－1 -N i Take an integer. The shear force F at the Ni"th position sNi" Parallel to the cross section of the bearing timber.

[0146] When the shear force at the Ni" position is the largest, the area between the shear force and the coordinate axis is the largest, and the bending moment at this position is also the largest. According to dM / dx=Fs The bending moment at position N1" is M N1" =S △FsN1" , S △FsN1" is the shear force F at position N1" sN1" The area between the x-axis and the Ni" =M Ni-1" +S△FsN i-1" -△FsN i" .

[0147] The above calculation results are compared with the allowable shear force and allowable negative bending moment of the SPMT modular vehicle, and the pressure-bearing wood is adjusted according to the comparison results. Specifically, it includes:

[0148] When the shear force and negative bending moment are less than the allowable shear force and allowable negative bending moment of the SPMT module vehicle, the vehicle configuration plan of the SPMT module vehicle is confirmed.

[0149] When the shear force and negative bending moment are less than the allowable shear force and negative bending moment of the SPMT module car's car plate, and P1 and P2 are greater than 80% of the rated axle load of the SPMT module car, adjust the position of the pressure-bearing wood at the maximum shear force and bending moment to reduce the deformation of the formwork car's car plate and protect the car plate to the greatest extent.

[0150] When the shear force and negative bending moment are greater than the allowable shear force and allowable negative bending moment of the SPMT module car, the position of the pressure-bearing wood and the center of gravity of the ship section are adjusted.

[0151] In one feasible approach, the possible adjustment measures include at least:

[0152] Move the center of gravity of the ship's main section to the side with the smaller axial pressure between the rear support point axial pressure P1 and the front support point axial pressure P2; move the pressure-bearing wood at the maximum shear position to the rear end of the SPMT module car; move the pressure-bearing wood at the maximum bending moment position to the rear end of the SPMT module car to achieve the balance of the front and rear axial pressures. Move the pressure-bearing wood at the maximum deflection to the front end of the SPMT module car to reduce the deformation of the car plate. The above adjustment measures can reduce the deformation of the car plate of the SPMT module car, so that the transportation of the giant ship's main section is more stable.

[0153] In summary, according to the design method of the SPMT modular vehicle provided in this application, the position of the center of gravity of the ship section on the SPMT modular vehicle and the position of the pressure-bearing wood are adjusted, which can effectively reduce the deformation of a certain part of the vehicle plate caused by axle load, shear force and bending moment. The stability and safety of the SPMT modular vehicle in transporting giant sections are improved, which indirectly alleviates the shortage of site resources and reduces the risk of lifting.

[0154] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A design method for a SPMT modular vehicle, characterized in that: The following steps are involved: S1. Obtain the information of the ship's total section; S2. Pre-allocate the vehicle according to the ship information and determine whether the number of SPMT module vehicle axles meets the requirements; S3, obtaining the resultant external force on the horizontal plane of the SPMT module vehicle during transportation, and the static friction of the SPMT module vehicle; comparing the resultant external force, the braking force and the static friction, and determining whether the SPMT module vehicle needs to be provided with a reinforcement structure according to the comparison result; S4. Establish a coordinate system based on the vehicle allocation information, obtain the front support point axial pressure P2 and the rear support point axial pressure P1 of the SPMT modular vehicle based on the coordinate system, and obtain the shear force and bending moment of each pressure-bearing wood based on the front support point axial pressure P2 and the rear support point axial pressure P1; compare the shear force and bending moment of each pressure-bearing wood with the allowable shear force and allowable negative bending moment of the vehicle panel of the SPMT modular vehicle, adjust the pressure-bearing wood according to the comparison results until the requirements are met, and complete the design of the SPMT modular vehicle.

2. The design method of the SPMT module vehicle according to claim 1, characterized in that: In step S2, at least it includes: determining the actual carrying capacity of the SPMT modular vehicle according to the vehicle allocation information, the actual carrying capacity is less than or equal to 80% of the rated axle load, determining the minimum number of axes n according to the actual carrying capacity, comparing the actual number of axes with the minimum number of axes n, and meeting the requirements when the actual number of axes is less than or equal to the minimum number of axes n.

3. The design method of the SPMT module vehicle according to claim 1, characterized in that: The combined external force includes at least wind load, braking force, dynamic load, ramp force, and centrifugal force.

4. The design method of the SPMT module vehicle according to claim 3, characterized in that: The forward direction of the SPMT module vehicle is defined as the X direction, and the direction perpendicular to the X direction on the horizontal plane is the Y direction; the resultant external force on the horizontal plane includes the resultant external force in the X direction and the resultant external force in the Y direction.

5. The design method of the SPMT module vehicle according to claim 1, characterized in that: In step S3, setting the reinforcement structure includes: welding and fixing the ship section and the transfer bracket of the SPMT module vehicle.

6. The design method of the SPMT module vehicle according to claim 1, characterized in that: In step S3, setting the reinforcement structure includes: setting a counterweight on the transfer bracket of the SPMT module vehicle.

7. The design method of the SPMT modular vehicle according to claim 1, characterized in that: In step S4, the front support point axial pressure P2 and the rear support point axial pressure P1 should both be less than or equal to 80% of the rated axial load of the SPMT.

8. The design method of the SPMT modular vehicle according to claim 1, characterized in that: When the shear force and negative bending moment are less than the allowable shear force and allowable negative bending moment of the SPMT module vehicle, and the axial pressure P2 of the front support point and the axial pressure P1 of the rear support point should be less than or equal to 80% of the rated axle load of the SPMT, the vehicle allocation plan of the SPMT module vehicle is confirmed.

9. The design method of the SPMT modular vehicle according to claim 1, characterized in that: When the shear force and negative bending moment are less than the allowable shear force and allowable negative bending moment of the SPMT module car, and the axial pressure P2 of the front support point and the axial pressure P1 of the rear support point are both greater than 80% of the rated axle load of the SPMT, adjust the position of the pressure-bearing wood at the maximum shear force and bending moment.

10. The design method of the SPMT module vehicle according to claim 1, characterized in that: When the shear force and negative bending moment are greater than the allowable shear force and allowable negative bending moment of the SPMT car plate, the position of the pressure-bearing wood and the center of gravity of the ship section are adjusted.

11. The design method of the SPMT module vehicle according to claim 10, characterized in that: In step S4, the adjustment measures at least include: Move the center of gravity of the ship section to the side with smaller axial pressure between the forward support point P1 and the rear support point P2; or move the pressure-bearing wood at the maximum shear position; or move the pressure-bearing wood at the maximum bending moment position; or move the pressure-bearing wood at the maximum deflection.

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