Ship engine damping system and control method

Abstract

The invention belongs to the field of ship damping equipment, and discloses a ship engine damping system which comprises an electric balancer, a damping device and a damping device. A mechanical system is arranged in the shell and comprises two balance blocks which are the same in rotating speed and opposite in rotating direction, and vertical torque generated in the rotating process of the balance blocks is transmitted to the shell, so that ship body resonance is compensated. And the control system is used for monitoring the operation of the host and executing motor control by receiving user instructions and parameters so as to control the speed and the phase of a balance block in the mechanical system. The two balance blocks are arranged in the ship body, connected with the main engine and rotate in the opposite directions, ship body resonance is counteracted through vertical torque generated by the balance blocks, vibration generated by the ship body is reduced, the stability of the ship body is improved, the possibility that the ship body is damaged and equipment on the ship is damaged is reduced, and therefore the service life of the ship body is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of ship electrical equipment and relates to a ship engine damping system and a control method. Background Art

[0002] When the ship engine is running, it will generate a second-order vertical torque. The superposition of this torque and the natural frequency of the hull will cause the hull to resonate, resulting in damage to the hull and equipment on board. Therefore, it is necessary to design an electric balancer to reduce the hull resonance and increase the life of the hull. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a ship engine shock absorption system and a control method.

[0004] In order to achieve the above-mentioned object, as a first aspect, the technical solution of the present invention is to provide a ship engine shock absorption system, comprising:

[0005] The electric balancer comprises a housing, the housing being in contact with a main engine of a ship; the interior of the housing comprises:

[0006] The mechanical system includes two balancing blocks with the same rotation speed and opposite rotation directions, and the vertical torque generated during the rotation of the balancing blocks is transmitted to the outer shell to compensate for the hull resonance;

[0007] The control system is used to monitor the operation of the host and perform motor control by receiving user instructions and parameters, thereby controlling the speed and phase of the balancing block in the mechanical system.

[0008] According to the present invention, further, the mechanical system also includes an electric motor, the output shaft of the electric motor is connected to a gear set formed by two mutually meshing gears, and each gear of the gear set is coaxially connected to a balancing block.

[0009] According to the present invention, further, the mechanical system is also provided with a first host reference sensor (ME TDC) and a second host reference sensor (ME BDC) placed at 340°CA for measuring the host speed and phase, and each host reference sensor is also correspondingly provided with a first marking block located at 340°CA and a second marking block located at 170°CA.

[0010] According to the present invention, further, the mechanical system also includes a balancing block sensor for measuring the rotational speed of the balancing block, which is arranged at a position of 315°CA, and the balancing block marker block is located at a position of 195°CA.

[0011] According to the present invention, further, the control system also includes a frequency converter and a controller electrically connected thereto; the frequency converter uses a torque mode in the control system to control the motor of the mechanical system and collects the motor speed in real time and feeds it back to the controller; the controller is used to receive user instructions, calculate the speed and phase of the host and the balancing block, and control the operation of the motor through the frequency converter.

[0012] According to the present invention, further, the control system also includes a braking resistor for absorbing kinetic energy generated during frequent braking of the motor.

[0013] According to the present invention, further, the control system is adjusted according to the rotation speeds of the balancing block and the main engine, and the rotation speed of the balancing block is adjusted to be twice the rotation speed of the main engine.

[0014] As a second aspect, the present invention also provides a control method for a ship engine damping system, using the ship engine damping system, the main engine speed is measured by a sensor signal, and the speed is measured twice per revolution. The first speed measurement starts with the pulse signal sent by the first main engine reference sensor (ME TDC) as the starting point to start timing (the timing accuracy is milliseconds), and ends when the second main engine reference sensor (ME BDC) sends a pulse signal again;

[0015] The first speed test host speed is

[0016]

[0017] The second speed measurement starts when the second host reference sensor (ME BDC) sends a pulse signal (the timing accuracy is milliseconds) and ends when the first host reference sensor (ME TDC) sends a pulse signal;

[0018] The host speed is

[0019]

[0020] The average of the two speed measurements yields the host speed of

[0021]

[0022] The host phase is

[0023] EnginePhase=EngineSpeed*(EngineTime1+EngineTime2)*360°.

[0024] Preferably, the balancing weight sensor starts timing when it sends out a pulse signal, and ends timing when the balancing weight sensor sends out a pulse signal again;

[0025] The balance weight speed is

[0026]

[0027] The phase of the balance block is

[0028] BalancerPhase=BalancerTime*BalancerSpeed*360°.

[0029] Furthermore, the control system is adjusted according to the rotation speed of the balancing block and the main engine, and the rotation speed of the balancing block is adjusted to be twice the rotation speed of the main engine; after the main engine rotation speed is calculated, the inverter is controlled to increase the motor speed to twice the speed of the main engine. Since the main engine speed is constantly changing, the PI algorithm is needed to adjust the balancing block speed in real time. When the main engine marker block passes through the main engine, the phase shift control is controlled within the phase difference range of the balancing block marker block from the balancing block; when the phase shift stage is started, the phase difference is calculated, and the speed and phase shift are adjusted through the speed loop and position loop dual-loop PID.

[0030] The beneficial effects of the present invention are:

[0031] 1. The present invention arranges two balancing blocks connected to the main engine in two opposite directions to rotate in the hull, and the vertical torque generated by the balancing blocks is used to offset the hull resonance, reduce the vibration generated by the hull, improve the hull stability, reduce the possibility of damage to the hull and damage to the equipment on board, thereby increasing the service life of the hull.

[0032] 2. The control system of the present invention is the core part for realizing the function of the electric balancer. It is responsible for monitoring the operation of the main engine and controlling the speed and phase of the balance block according to external instructions. It adjusts the speed and phase of the balance block in real time to make the speed and phase of the balance block synchronized with the vibration of the hull, thereby accurately reducing the resonance of the hull. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the mechanical system of the ship engine shock absorbing system of the present invention;

[0034] Figure 2 It is a schematic diagram of the rotation of the balance block of the ship engine shock absorption system of the present invention;

[0035] Figure 3 A schematic diagram of a control panel of a ship engine damping system of the present invention;

[0036] Figure 4 A schematic diagram of the working state of the control system of the electric balancer of the present invention;

[0037] Figure 5 It is a schematic diagram of the arrangement of the host reference sensor of the ship engine damping system of the present invention;

[0038] Figure 6A schematic diagram of the arrangement of the reference sensors of the balance blocks of the ship engine damping system of the present invention;

[0039] Figure 7 The invention is a schematic diagram of the installation state of the ship engine shock absorbing system. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0041] The embodiment of the present application discloses a ship engine shock absorption system, such as Figure 7 As shown, it is used for a ship power system, including an electric balancer connected to an electric motor of the hull, and the electric balancer includes two parts: a mechanical system and a control system. The control system is used to monitor the operation of the main engine and execute motor control by receiving user instructions and parameters, thereby controlling the speed and phase of the balance block in the mechanical system, so as to achieve the same frequency of the speed and phase of the balance block with the motor speed, thereby improving the shock absorption effect of the balance block.

[0042] Specifically, see Figure 1 and Figure 2 , are schematic diagrams of the structure of the mechanical system and the rotation of the balancing block, respectively; the mechanical system includes a motor 100, the output shaft of the motor 100 is connected to a gear set 200 formed by two mutually meshing gears, each gear in the gear set 200 is coaxially connected to a balancing block 300, and the two balancing blocks 300 rotate in opposite directions. The horizontal centrifugal forces generated by the balancing blocks 300 during rotation cancel each other out, and the vertical torque generated is transmitted to the outer shell by the compensation shaft through the bearing, thereby compensating for the hull resonance and achieving the shock absorption effect.

[0043] The mechanical system is also provided with a first host reference sensor (ME TDC) and a second host reference sensor (ME BDC) for measuring the host speed and phase, and each reference sensor is also provided with a first marking block and a second marking block. Figure 5, is a schematic diagram of the layout of the host reference sensor. Both host reference sensors are placed at 340°CA. The first marking block of the first host reference sensor (ME TDC) is located at 340°CA, and the second marking block of the second host reference sensor (ME BDC) is located at 170°CA. The host speed is measured through the sensor signal. Since there are two host reference sensors, the speed can be measured twice per lap. The first speed measurement starts with the pulse signal sent by the first host reference sensor (ME TDC) as the starting point (the timing accuracy is milliseconds), and the timing ends when the second host reference sensor (ME BDC) sends a pulse signal again.

[0044] The first speed test host speed is

[0045]

[0046] The second speed measurement starts when the second host reference sensor (ME BDC) sends a pulse signal (the timing accuracy is milliseconds) and ends when the first host reference sensor (ME TDC) sends a pulse signal;

[0047] The host speed is

[0048]

[0049] The average of the two speed measurements yields the host speed of

[0050]

[0051] The host phase is

[0052] EnginePhase=EngineSpeed*(EngineTime1+EngineTime2)*360°.

[0053] Also includes a balancing mass sensor for measuring the balancing mass rotation speed, see Figure 6 , arranged at 315°CA, and the balance block marker block is located at 195°CA. The timing starts when the balance block sends a pulse signal (the timing accuracy is milliseconds) and ends when the balance block sends a pulse signal again.

[0054] The balance weight speed is

[0055]

[0056] The phase of the balance block is

[0057] BalancerPhase=BalancerTime*BalancerSpeed*360°.

[0058] The control system described in detail below is used to adjust the rotation speed of the balancing weight and the main engine so that the rotation speed of the balancing weight is twice that of the main engine.

[0059] See also Figure 3 , which is a schematic diagram of a control panel 400; the control system includes a control panel 400, on the surface of which are mounted an indicator light for feedback of the operating status of the system, buttons for user operation, and a dial for displaying the power consumption of the motor.

[0060] The control system also includes a frequency converter and a controller electrically connected thereto. The frequency converter uses a torque mode in the control system to control the motor of the mechanical system and collects the motor speed in real time and feeds it back to the controller; the controller is used to receive user instructions, calculate the speed and phase of the host and the balancing block, and control the operation of the motor through the frequency converter.

[0061] Specifically, the inverter is equipped with torque protection. If the predefined torque is exceeded, the motor will be controlled to stop. The inverter adopts Huichuan MD880 high-performance inverter, which can be used to control AC asynchronous induction motors and permanent magnet motors. It has the characteristics of high power density, compact structure and high reliability. It can realize V / F control, encoderless vector control (SVC) and encoder vector control (FVC) of the motor. The rated power range of single-machine transmission is 3.7kW~1300kW. The MD880 inverter is equipped with HCU control module as standard. The HCU control module can be expanded with encoder detection module, I / O module, fieldbus module, industrial Ethernet module and data conversion module. Different functions can be expanded by adding different modules.

[0062] The controller model is CS-CDA08001, which is used to implement the control logic. The CS-DA08001 controller has rich I / O interfaces and supports 485, CAN and Ethernet communication methods; the analog output signal of CS-DA08001 is 4-20mA current signal, so in this design, 4-20mA corresponds to the motor torque output 0-100%, plus a motor direction signal line to control the motor rotation direction.

[0063] The control system also includes a braking resistor for absorbing the kinetic energy generated during frequent braking of the motor to prevent the motor from overheating and damage.

[0064] See also Figure 4, is a schematic diagram of the working state of the control system of the electric balancer. The control system includes the running state, fault state and emergency stop state. Among them, after confirming that there is no fault or manually stopping, the system enters the standby state (Ready) and waits for the running conditions. There are two operating modes in the running state, manual operation and automatic operation, and the operating mode is specified by the user. During the operation process, if any fault occurs in the system, the system will enter the fault state. At this time, the electric balancer stops and waits for the user to check and restore the fault. In any of the above states, pressing the emergency stop button will cause the system to enter the emergency stop state. When the system is in the emergency stop state, the inverter will be powered off and the motor will stop. When the reset emergency stop button is activated, the system will enter the standby state.

[0065] Working principle: The control system is adjusted according to the rotation speed of the balancing block and the main engine, and the rotation speed of the balancing block is adjusted to twice the rotation speed of the main engine. After the main engine rotation speed is calculated, the inverter is controlled to increase the motor speed to twice the speed of the main engine. Since the main engine speed is constantly changing, the PI algorithm is needed to adjust the balancing block speed in real time. When the main engine marker block passes through the main engine, the phase difference between the balancing block marker block and the balancing block, the phase shift control is to keep this phase difference within the specified range. During the phase shift process, the speed must be within the allowable deviation (speed asynchronous); when the phase shift stage is started, the phase difference is calculated, and the speed and phase shift are adjusted through the speed loop and position loop dual-loop PID.

[0066] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A ship engine shock absorption system, characterized in that: include, The electric balancer comprises a housing, the housing being in contact with a main engine of a ship; the interior of the housing comprises: The mechanical system includes two balancing blocks with the same rotation speed and opposite rotation directions, and the vertical torque generated during the rotation of the balancing blocks is transmitted to the outer shell to compensate for the hull resonance; The control system is used to monitor the operation of the host and perform motor control by receiving user instructions and parameters, thereby controlling the speed and phase of the balancing block in the mechanical system.

2. A ship engine vibration reduction system according to claim 1, characterized in that: The mechanical system further comprises an electric motor, wherein an output shaft of the electric motor is connected to a gear set formed by two gears meshing with each other, and each gear of the gear set is coaxially connected to a balancing block.

3. A ship engine vibration reduction system according to claim 2, characterized in that: The mechanical system is also provided with a first host reference sensor (ME TDC) and a second host reference sensor (ME BDC) placed at 340°CA for measuring the host speed and phase, and each host reference sensor is also correspondingly provided with a first marking block located at 340°CA and a second marking block located at 170°CA.

4. A ship engine vibration reduction system according to claim 3, characterized in that: The mechanical system also includes a balancing weight sensor for measuring the rotational speed of the balancing weight, which is arranged at a position of 315°CA, and a balancing weight marker block is located at a position of 195°CA.

5. A ship engine damping system according to any one of claims 1 to 4, characterized in that: The control system also includes a frequency converter and a controller electrically connected thereto; the frequency converter uses a torque mode in the control system to control the motor of the mechanical system and collects the motor speed in real time and feeds it back to the controller; the controller is used to receive user instructions, calculate the speed and phase of the host and the balancing block, and control the operation of the motor through the frequency converter.

6. A ship engine vibration reduction system according to claim 5, characterized in that: The control system also includes a braking resistor for absorbing kinetic energy generated during frequent braking of the motor.

7. A ship engine vibration reduction system according to claim 1, characterized in that: The control system is adjusted according to the rotation speeds of the balancing block and the main engine, and is adjusted to a rotation speed of the balancing block that is twice the rotation speed of the main engine.

8. A control method for a ship engine damping system, characterized in that: The ship engine damping system as claimed in claim 4 is used, the main engine speed is measured by the sensor signal, and the speed is measured twice per revolution; the first speed measurement starts with the pulse signal sent by the first main engine reference sensor (ME TDC) as the starting point for timing (the timing accuracy is milliseconds), and ends when the second main engine reference sensor (ME BDC) sends a pulse signal again; The first speed test host speed is The second speed measurement starts when the second host reference sensor (ME BDC) sends a pulse signal (the timing accuracy is milliseconds) and ends when the first host reference sensor (ME TDC) sends a pulse signal; The host speed is The average of the two speed measurements yields the host speed of The host phase is EnginePhese=EngineSpeed*(BngiineTme1+EngineTine2)*360°.

9. A control method for a ship engine damping system according to claim 8, characterized in that: The timing starts when the balancing weight sensor sends a pulse signal and ends when the balancing weight sensor sends a pulse signal again; The balance weight speed is The phase of the balance block is BalamcerPhase=BalancerTime*BalamcerSpeed*360°.

10. A control method for a ship engine damping system according to claim 9, characterized in that: The control system is adjusted according to the rotation speed of the balancing block and the main engine, and is adjusted to the rotation speed of the balancing block being twice the rotation speed of the main engine; after calculating the rotation speed of the main engine, the frequency converter is controlled to increase the motor speed to twice the speed of the main engine. Since the speed of the main engine is constantly changing, the PI algorithm is required to adjust the speed of the balancing block in real time. When the main engine marker block passes through the main engine, the phase shift control is controlled within the phase difference range between the balancing block marker block and the balancing block; When the phase shift stage is started, the phase difference is calculated and the speed and phase shift are adjusted through the speed loop and position loop dual-loop PID.

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