A test device and method for simulating the swaying performance of marine rotating machinery

Abstract

A test device and method for simulating the sway of a marine rotating machinery belongs to the technical field of heeling experiments on rotating machinery. The present invention aims to solve the problem that there is currently no rotor system test device that can be used to simulate the swaying of a ship. A driving hydraulic cylinder is fixed on a working platform, one end of a rocker is hinged to the working platform at point C and is located on one side of the output end of the driving hydraulic cylinder, the other end of the rocker is fixedly connected to the base at point A, the piston rod on the output end of the driving hydraulic cylinder is hinged to one end of a connecting rod at point D, the other end of the connecting rod is hinged to the rocker at point B, and the connecting rod and the rocker can overlap. A test device and method for simulating the swaying of a marine rotating machinery of the present invention can control the left and right swinging of the base plate through a hydraulically controlled transmission swing device, thereby simulating the heel, pitch and other working conditions of the rotor system.

Description

Technical Field

[0001] The invention relates to a test device and a method, in particular to a test device and a method for simulating the swaying of a marine rotating machine, belonging to the technical field of heeling experiments of rotating machine equipment. Background Art

[0002] When a ship is sailing at sea, due to the action of external or internal forces, the buoyancy and gravity are not in line when the ship is floating, which will cause the ship to tilt forward and backward, left and right, and the draft on both sides will be different, causing the ship to tilt longitudinally or transversely. The swaying characteristics will cause the marine rotating mechanical power equipment to show different dynamic characteristics, affecting its stability and reliability, and even inducing failures. Therefore, the establishment of an experimental simulation device to simulate the swaying of marine rotating machinery has great engineering practical significance and guiding role. Summary of the invention

[0003] The purpose of the present invention is to provide a test device and method for simulating the swaying performance of a marine rotating machinery, so as to solve the above technical problems.

[0004] A force analysis method based on a test device simulating the swaying of a marine rotating machine comprises the following steps:

[0005] Step 1, establishing a test device for simulating the swaying of a marine rotating machinery, and determining factors affecting the swaying of the marine rotating machinery;

[0006] Step 2, establishing a force relationship formula for each point through the factors affecting the swaying of the marine rotating machinery determined in step 1 and the moment theorem;

[0007] Step 3, deriving the quasi-static force analysis equation of the mechanism according to the force relationship formula of each point in step 2;

[0008] Step 4, the stress state of the test device is obtained by the quasi-static stress analysis equation of the mechanism obtained in step 3.

[0009] A test device for simulating the swaying property of a marine rotating machine, comprising a driving hydraulic cylinder, a piston rod, a connecting rod, a rocker, a base and a marine rotating machine;

[0010] The driving hydraulic cylinder is fixed on the working platform, one end of the rocker is hinged to the working platform at point C and is located on one side of the output end of the driving hydraulic cylinder, the other end of the rocker is fixedly connected to the base at point A, the piston rod on the output end of the driving hydraulic cylinder and one end of the connecting rod are hinged to point D, the other end of the connecting rod is hinged to the rocker at point B, and the connecting rod and the rocker can overlap.

[0011] Preferably: the rotating device comprises a motor, a rotating shaft, a first bearing seat, a disc and a second bearing seat;

[0012] The motor is fixedly mounted on the base, the output end of the motor is connected to one end of the rotating shaft, the other end of the rotating shaft passes through the first bearing seat, the disc and the second bearing seat in sequence, and the first bearing seat and the second bearing seat are fixedly mounted on the base.

[0013] Preferably, the upper end of the rocker arm is fixedly connected to the base via a plurality of bolts, and the bolts are distributed in a circular shape.

[0014] Compared with existing products, the present invention has the following effects:

[0015] The hydraulically controlled transmission swing device can be used to control the left and right swing of the base plate, thereby simulating the heel and pitch conditions of the rotor system;

[0016] The designed test device drives the connecting rod swing mechanism through the hydraulic system to control the left and right swing of the base plate, thereby simulating the heel and pitch conditions of the rotor system; the device has a simple structure, few components, convenient processing, and high transmission efficiency. The heavy-duty device can be controlled by the hydraulic system, and the swing angle amplitude of the heel can be adjusted by controlling the horizontal displacement output of the hydraulic cylinder, with high safety, reliability and stability;

[0017] The rocker arm and the base are fixed together by bolts. With this method, the roll and pitch tests can be switched arbitrarily by removing the bolts and rotating the base angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a left-leaning state of a test device for simulating the swaying property of a marine rotating machinery according to the present invention;

[0019] Figure 2 It is a structural schematic diagram of the test device in a horizontal state;

[0020] Figure 3 It is a structural schematic diagram of the test device in the right-leaning state;

[0021] Figure 4 It is a structural diagram of the consolidation method of the base and the rocker;

[0022] Figure 5 It is a schematic diagram of the quasi-static force analysis of the test device.

[0023] In the figure: 1-driving hydraulic cylinder, 2-piston rod, 3-connecting rod, 4-rocker, 41-upper end, 5-base, 6-marine rotating mechanical equipment, 7-bolt. DETAILED DESCRIPTION

[0024] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 5As shown, the force analysis method of a test device based on simulating the swaying of a marine rotating machinery according to the present invention comprises the following steps:

[0026] Step 1, establishing a test device for simulating the swaying of a marine rotating machinery, and determining factors affecting the swaying of the marine rotating machinery;

[0027] Step 2, establishing a force relationship formula for each point through the factors affecting the swaying of the marine rotating machinery determined in step 1 and the moment theorem;

[0028] Step 3, deriving the quasi-static force analysis equation of the mechanism according to the force relationship formula of each point in step 2;

[0029] Step 4, the stress state of the test device is obtained by the quasi-static stress analysis equation of the mechanism obtained in step 3.

[0030] A test device for simulating the swaying property of a marine rotating machine, comprising a driving hydraulic cylinder 1, a piston rod 2, a connecting rod 3, a rocker 4, a base 5 and a marine rotating machine device 6;

[0031] The driving hydraulic cylinder 1 is fixed on the working platform, one end of the rocker arm 4 is hinged to the working platform at point C and is located on one side of the output end of the driving hydraulic cylinder 1, the other end of the rocker arm 4 is fixedly connected to the base 5 at point A, the piston rod 2 on the output end of the driving hydraulic cylinder 1 and one end of the connecting rod 3 are hinged at point D, the other end of the connecting rod 3 is hinged to the rocker arm 4 at point B, and the connecting rod 3 and the rocker arm 4 can overlap.

[0032] Further: the rotating device 6 includes a motor, a rotating shaft, a first bearing seat, a disc and a second bearing seat;

[0033] The motor is fixedly mounted on the base 5 , the output end of the motor is connected to one end of the rotating shaft, and the other end of the rotating shaft passes through the first bearing seat, the disc and the second bearing seat in sequence, and the first bearing seat and the second bearing seat are fixedly mounted on the base 5 .

[0034] Furthermore, the upper end portion 41 of the rocker arm 4 is fixedly connected to the base 5 via a plurality of bolts 7 , and the bolts 7 are distributed in a circular shape.

[0035] Working principle: The hydraulic cylinder acts as a driving device, pushing the piston rod to move horizontally. The piston rod and the connecting rod are hinged at point A, and the piston rod drives the connecting rod to swing. The connecting rod and the rocker are hinged at point B. The rocker is fixedly hinged to the ground at point C. The rocker drives the connecting rod to swing around the fixed hinge point C. The base and the rocker are fixed at point A. The base is fixed to the marine rotating mechanical equipment. The base is driven by the rocker to control the swing of the rotating mechanical equipment.

[0036] like Figure 1As shown, the control hydraulic system controls the piston rod to push rightward, driving the connecting rod to swing counterclockwise, and the connecting rod drives the rocker to swing clockwise around point C, thereby reaching a horizontal state, as shown in FIG. Figure 2 As shown, continuing the movement can eventually achieve Figure 3 Rightward tilt shown.

[0037] like Figure 3 As shown, the control hydraulic system controls the piston rod to push to the left, driving the connecting rod to swing clockwise, and the connecting rod drives the rocker to swing counterclockwise around point C, thereby reaching a horizontal state, as shown in FIG. Figure 2 As shown, continuing the movement can eventually achieve Figure 1 The right-leaning state shown.

[0038] The length of the connecting rod in the mechanism is equal to the length of the BC section of the rocker, that is, during the entire movement of the mechanism, the triangle BDC is an isosceles triangle.

[0039] The consolidation method of the rocker and the base is as follows Figure 4 As shown, the two are fastened together by bolts. By fastening in this way, the roll and pitch tests can be switched arbitrarily by removing the bolts and rotating the base angle.

[0040] Quasi-static force analysis of the mechanism Figure 5 As shown, through force analysis and moment theorem analysis, when in equilibrium position, we can get:

[0041] Gsinβ.l AC -Fsinαl BC =0

[0042] Where: α = 2β

[0043] Finally, we can get: Gl AC -2Fcosβl BC =0

[0044] G represents the gravity of the base and the rotating device, F represents the force exerted by the connecting rod on the rocker, α represents the angle between the connecting rod and the rocker, β represents the angle between the connecting rod and the vertical direction, l BC Represents the length of the rocker hinge point B to hinge point C, l AC Represents the total length of the joystick.

[0045] Through the above quasi-static analysis, it can be seen that when the β value is small, the force provided by the piston rod can be reduced, which is conducive to improving the transmission efficiency of the mechanism. Therefore, the β value should not exceed 20°, that is, α should not exceed 40°, l BC The length should be greater than l AC Two thirds of the length.

[0046] This implementation is only an exemplary description of this patent and does not limit its protection scope. Those skilled in the art may also make partial changes to it, as long as they do not exceed the spirit of this patent, they are all within the protection scope of this patent.

Claims

1. A force analysis method based on a test device for simulating the sway of a marine rotating machinery, comprising a driving hydraulic cylinder (1), a piston rod (2), a connecting rod (3), a rocker (4), a base (5) and a marine rotating machinery device (6); the driving hydraulic cylinder (1) is fixed on a working platform, one end of the rocker (4) is hinged to the working platform at point C and is located on one side of the output end of the driving hydraulic cylinder (1), the other end of the rocker (4) is fixedly connected to the base (5) at point A, the piston rod (2) on the output end of the driving hydraulic cylinder (1) is hinged to one end of the connecting rod (3) at point D, the other end of the connecting rod (3) is hinged to the rocker (4) at point B, and the connecting rod (3) and the rocker (4) can overlap, characterized in that: The following steps are involved: Step 1, establishing a test device for simulating the swaying of a marine rotating machinery, and determining factors affecting the swaying of the marine rotating machinery; Step 2, establishing a force relationship formula for each point through the factors affecting the swaying of the marine rotating machinery determined in step 1 and the moment theorem; Step 3: According to the force relationship formula of each point in step 2, the quasi-static force analysis equation of the mechanism is derived. Through force analysis and moment theorem analysis, when it is in equilibrium position, it can be obtained: Gsinβ.l AC -Fsinαl BC =0 Where: α = 2β Finally, we can get: Gl AC -2Fcosβl BC =0 G represents the gravity of the base and the rotating device, F represents the force exerted by the connecting rod on the rocker, α represents the angle between the connecting rod and the rocker, β represents the angle between the connecting rod and the vertical direction, l BC Represents the length of the rocker hinge point B to hinge point C, l AC Represents the total length of the joystick; Step 4, the stress state of the test device is obtained by the quasi-static stress analysis equation of the mechanism obtained in step 3.

2. A force analysis method based on a test device simulating the sway of a marine rotating machinery according to claim 1, characterized in that: The rotating device (6) comprises a motor, a rotating shaft, a first bearing seat, a disc and a second bearing seat; The motor is fixedly mounted on the base (5), the output end of the motor is connected to one end of the rotating shaft, the other end of the rotating shaft passes through the first bearing seat, the disc and the second bearing seat in sequence, and the first bearing seat and the second bearing seat are fixedly mounted on the base (5).

3. A force analysis method based on a test device simulating the sway of a marine rotating machinery according to claim 2, characterized in that: The upper end portion (41) of the rocker (4) is fixedly connected to the base (5) via a plurality of bolts (7), and the bolts (7) are distributed in a circular shape.

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