CN114909425B - Variable damping vibration attenuation mechanism and method for high-power marine engine - Google Patents
Variable damping vibration attenuation mechanism and method for high-power marine engine Download PDFInfo
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- CN114909425B CN114909425B CN202210453274.0A CN202210453274A CN114909425B CN 114909425 B CN114909425 B CN 114909425B CN 202210453274 A CN202210453274 A CN 202210453274A CN 114909425 B CN114909425 B CN 114909425B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/18—Control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention relates to the field of diesel engines, and discloses a variable damping vibration attenuation mechanism of a high-power marine engine and a method thereof.
Description
Technical Field
The invention relates to the field of diesel engines, in particular to a variable damping vibration attenuation mechanism of a high-power marine engine and a method thereof.
Background
In marine diesel engines, the marine diesel engines are all provided with high-power engines, power is transmitted through a crankshaft in the high-power engines, and torsional vibration can be generated between the crankshaft and the crankshaft due to the fact that the crankshaft comprises a flywheel end and a free end, and in order to reduce the torsional vibration, a silicone oil damper is arranged at the free end of the crankshaft;
however, the silicon oil damper has a small damping range, has limitation on damping effect, cannot effectively damp for all rotating speed working conditions of the marine engine, can only control vibration at preset rotating speed frequency, and has poor torsional vibration damping effect at other rotating speeds.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a variable damping vibration reduction mechanism and a variable damping vibration reduction method for a high-power marine engine, which are used for expanding the vibration reduction range of a crankshaft and reducing vibration more effectively.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a high-power marine engine variable damping vibration damping mechanism, includes the casing with bent axle free end fixed connection, the casing include the upper cover and with upper cover fixed connection's lower cover, the upper cover with be formed with between the lower cover and hold the chamber, hold the intracavity fixedly connected with annular magnetic ring that hinders, with separate hold the chamber, form electromagnetic cavity and damping chamber, electromagnetic cavity is provided with annular solenoid, the suspension of damping intracavity has annular inertial mass to be full of magnetorheological fluid, the casing outside is provided with the controller, the controller with solenoid electric connection.
As a further improvement of the invention, the inertia block comprises an outer ring and an inner ring which are integrally formed, the width of the outer ring is larger than that of the inner ring, at least one first groove is formed in one side of the outer ring, which faces the magnetic resistance ring, and the first groove is circumferentially arranged along the central axis of the outer ring.
As a further improvement of the invention, second grooves are formed in two opposite sides of the outer ring, and the second grooves are annularly arranged along the circumferential direction of the central axis of the outer ring.
As a further improvement of the invention, the bottom wall of the damping cavity is fixedly connected with an annular wear-resistant pad.
As a further improvement of the invention, the outer side surfaces of the upper cover and the lower cover are respectively provided with a first annular groove and a second annular groove, the depth of the first annular groove is smaller than that of the second annular groove, the inner diameter of the first annular groove is larger than the outer diameter of the second annular groove, and the two second annular grooves are positioned on two opposite sides of the inner ring.
As a further improvement of the present invention, the cross sections of the first groove and the second groove are each rectangular, and the ratio of the cross-sectional area of the second groove to the cross-sectional area of the first groove ranges from 0.5 to 0.8, and the ratio of the depth of the second groove to the depth of the first groove ranges from 0.7 to 0.8.
The variable damping vibration reduction method of the high-power marine engine comprises the variable damping vibration reduction mechanism of the high-power generator, an encoder arranged at the free end of a crankshaft and a rotation speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for collecting the instantaneous angular velocity of the free end of the crankshaft in real time, and the rotating speed sensor is used for collecting the average angular velocity of the flywheel end of the crankshaft;
the detection step comprises: the controller receives the instantaneous angular velocity and the average angular velocity in real time, and obtains the torsional angular velocity through the difference value;
and (3) adjusting: the controller adjusts the current of the electromagnetic coil through self-adaptive sliding mode control according to the change of the torsional vibration angular speed.
As a further improvement of the present invention, the adjusting step includes a judging unit for judging a magnitude change direction of the torsional angular velocity under increasing the current of the electromagnetic coil or decreasing the current of the electromagnetic coil;
under the condition of increasing the current of the electromagnetic coil, if the current torsional vibration angular speed is larger than the previous torsional vibration angular speed, the current of the electromagnetic coil is reduced, and if the current torsional vibration angular speed is smaller than the previous torsional vibration angular speed, the current of the electromagnetic coil is continuously increased;
under the condition of reducing the current of the electromagnetic coil, if the current torsional vibration angular speed is larger than the previous torsional vibration angular speed, the current of the electromagnetic coil is increased, and if the current torsional vibration angular speed is smaller than the previous torsional vibration angular speed, the current of the electromagnetic coil is reduced;
and a control current I is preset, and the control electromagnetic coil current is smaller than the control current I.
As a further improvement of the invention, the electromagnetic coil is divided into a plurality of arc-shaped sections, and the energizing current is preset in the judging unit;
when the current of the electromagnetic coil is increased, if the non-energized arc-shaped section exists, the current of the energized arc-shaped section is increased to the energizing current, and the non-energized arc-shaped section is energized;
if the current of all the arc sections is larger than or equal to the energizing current, the current of the electromagnetic coil is increased at the same time;
when the current of the electromagnetic coil is reduced, if the current of all the arc-shaped sections is larger than the energizing current, the current of the electromagnetic coil is reduced at the same time;
if the current of all the arc segments is equal to the energizing current or the non-energized arc segments exist, selecting one energized arc segment, reducing the current of the energized arc segment, and simultaneously controlling the current of the rest energized arc segments to be unchanged.
As a further improvement of the invention, the arc segments are powered on or off at intervals.
The invention has the beneficial effects that: the electromagnetic coil is controlled by the controller to damp vibration, the vibration damping range is enlarged, the electromagnetic coil is arranged in the electromagnetic cavity, namely the shell, the distance between the electromagnetic coil and the effective working area of the magnetorheological fluid is controlled to control the magnetic field intensity, the influence of the upper cover and the lower cover on the magnetic field is prevented, the magnetic blocking ring is arranged, the magnetic blocking ring is made of steel and is non-magnetic, on one hand, the magnetorheological fluid in the damping cavity is prevented from flowing into the electromagnetic cavity to form sealing, on the other hand, the magnetic blocking ring is arranged, the magnetic field generated by the magnetic current coil can avoid the magnetic blocking ring to enter the damping cavity, the radius of the magnetic field is enlarged, the magnetorheological fluid can be influenced by the magnetic field, the resistance of the magnetorheological fluid is effectively controlled, the outer ring is close to the magnetic field generated by the electromagnetic coil, the change of the viscosity of the magnetorheological fluid at the position is more sensitive, the contact area of the inertia block and the magnetorheological fluid at the position is increased, and the contact area of the magnetic rheological fluid is increased through the first groove to increase the contact area, so that the reaction of the magnetorheological fluid is more rapid after the current of the electromagnetic coil is changed.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view of the present invention at A in FIG. 2;
fig. 4 is a schematic diagram of the structure of the inertial mass in the present invention.
Reference numerals: 1. a housing; 11. an upper cover; 12. a lower cover; 13. a first ring groove; 14. a second ring groove; 2. a magnetic blocking ring; 3. an electromagnetic coil; 4. an inertial mass; 41. an outer ring; 411. a first groove; 412. a second groove; 42. an inner ring; 6. a controller; 7. wear-resistant pad.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Referring to fig. 1 to 4, the variable damping vibration attenuation mechanism of the high-power marine engine of this embodiment includes a housing 1 fixedly connected to a free end of a crankshaft, and the variable damping vibration attenuation mechanism is disposed at the free end of the crankshaft, so that the damping effect is better, the flywheel end detects an average angular velocity, the housing 1 includes an upper cover 11 and a lower cover 12 fixedly connected to the upper cover 11, a receiving cavity is formed between the upper cover 11 and the lower cover 12, an annular choke ring 2 is fixedly connected in the receiving cavity to separate the receiving cavity, an electromagnetic cavity and a damping cavity are formed, the choke ring 2 is made of steel, and is non-magnetic, on one hand, the choke ring 2 prevents magnetorheological fluid in the damping cavity from flowing into the electromagnetic cavity to form a seal, and on the other hand, the arrangement of the choke ring 2 enables a magnetic field generated by a magnetic current coil to bypass the choke ring 2 into the damping cavity, the radius of the magnetic field is enlarged, so that the magnetorheological fluid can be influenced by the magnetic field, the resistance of the magnetorheological fluid is effectively controlled, an annular electromagnetic coil 3 is arranged in an electromagnetic cavity, the distance between the electromagnetic cavity and an effective working area of the magnetorheological fluid is controlled, the magnetic field intensity is controlled, the influence of the upper cover 11 and the lower cover 12 on the magnetic field is prevented, if the electromagnetic coil 3 is arranged outside the upper cover 11 or the lower cover 12, the magnetic field passes through the upper cover 11 or the lower cover 12, the influence of the magnetic field on the magnetorheological fluid is weakened, an annular inertia block 4 is suspended in a damping cavity and is filled with the magnetorheological fluid, a controller 6 is arranged outside a shell 1, a power supply is arranged in the controller 6, the controller 6 is electrically connected with the electromagnetic coil 3 and can be connected through a power line, in general case, the crankshaft is provided with a silicon oil damper for damping, and the damping range of the silicon oil damper is small, the device can not effectively damp all rotating speed working conditions of the marine engine, can only control vibration at preset rotating speed frequency, has poor torsional vibration damping effect on other rotating speeds, controls the current of the electromagnetic coil 3 through the controller 6 so as to control the viscosity of magnetorheological fluid, thereby changing the friction resistance between the magnetorheological fluid and the inertia block 4, and generates heat through acting between the rotating distance and the friction resistance of the inertia block 4 due to the rotation of inertia so as to consume torsional vibration energy, thereby achieving the damping effect.
Vibration reduction is performed through the electromagnetic coil 3, the magnetorheological fluid and the inertia block 4, the regulation range is large, but the current regulation maximum point is provided, the current regulation maximum point is that the magnetorheological fluid becomes solid under the influence of current, and when the magnetorheological fluid becomes solid, the inertia block 4 or the shell 1 can be damaged, even the crankshaft is damaged.
Referring to fig. 4, the inertia block 4 includes an outer ring 41 and an inner ring 42 which are integrally formed, the width of the outer ring 41 is greater than that of the inner ring 42, the cross section of the inertia block 4 is T-shaped, at least one first groove 411 is formed in one side of the outer ring 41 facing the magnetic blocking ring 2, the first groove 411 is circumferentially arranged along the central axis of the outer ring 41, the outer ring 41 is close to the magnetic blocking ring 2 and is closer to a magnetic field generated by the electromagnetic coil 3, so that the viscosity change of magnetorheological fluid at the position is more sensitive, the contact area of the inertia block 4 with the magnetorheological fluid at the position is increased, and the contact area is increased by forming the first groove 411, so that after the current of the electromagnetic coil 3 is changed, the reaction of the magnetorheological fluid is more rapid, the friction resistance is increased, and the energy loss in vibration reduction is facilitated.
The second grooves 412 are formed in two opposite sides of the outer ring 41, the second grooves 412 are circumferentially arranged along the central axis of the outer ring 41, on one hand, the contact area between two opposite sides of the outer ring 41 and magnetorheological fluid is increased, on the other hand, the stability of the outer ring 41 and the inner ring 42, especially the stability of the inner ring 42 due to inertial rotation, is increased, the inner ring 42 is prevented from being increased due to sudden resistance increase of the first groove 411 on the outer ring 41, and the resistance difference between the magnetorheological fluid located in the first groove 411 and the magnetorheological fluid in other places is too large, so that the inner ring 42 swings transversely and collides with the upper cover 11 or the lower cover 12, and the inertial block 4, the upper cover 11 and the lower cover 12 are damaged.
Referring to fig. 2 and 3, the damping cavity bottom wall is fixedly connected with an annular wear pad 7, so that the inertial mass 4 is prevented from being directly contacted with the damping cavity bottom wall in the process of inertial activity, and the inertial mass 4 or the shell 1 is prevented from being damaged.
The upper cover 11 and the lower cover 12 lateral surface have all seted up first annular 13 and second annular 14, and the degree of depth of first annular 13 is less than the degree of depth of second annular 14, and the internal diameter of first annular 13 is greater than the external diameter of second annular 14, and two second annular 14 are located the opposite both sides of inner ring 42, and first annular 13 and second annular 14 are used for the heat dissipation, increase heat dissipation area, and second annular 14 is used for making up the heat dissipation area of first annular 13 for the heat that the department of inner ring 42 produced also can pass through inner ring 42 in the heat dissipation process through first annular 13, then disperses through second annular 14.
The cross sections of the first groove 411 and the second groove 412 are rectangular, the range of the ratio of the cross section area of the second groove 412 to the cross section area of the first groove 411 is 0.5 to 0.8, the range of the ratio of the depth of the second groove 412 to the depth of the first groove 411 is 0.7 to 0.8, the cross section area of the middle position part of the first groove 411 is larger, so that the resistance of the inertia block 4 at the position is large, the inertia block 4 is prevented from shaking left and right, the second groove 412 is formed to offset the shaking energy of the inertia block 4, the shaking is limited by increasing the shaking resistance of the inertia block 4, and meanwhile, the rotation resistance of the inertia block 4 is increased.
The variable damping vibration reduction method of the high-power marine engine comprises the variable damping vibration reduction mechanism of the high-power generator, an encoder arranged at the free end of a crankshaft and a rotation speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for collecting the instantaneous angular velocity of the free end of the crankshaft in real time, and the rotating speed sensor is used for collecting the average angular velocity of the flywheel end of the crankshaft; the rotational speed sensor obtains the rotational speed of the flywheel end and then calculates the average angular velocity of the flywheel end
The detection step comprises: the controller 6 receives the instantaneous angular velocity and the average angular velocity in real time, and obtains the torsional angular velocity through the difference value;
and (3) adjusting: the controller 6 adjusts the current of the electromagnetic coil 3 through self-adaptive sliding mode control according to the change of the torsional angular velocity. The current of the electromagnetic coil 3 is adjusted through the self-adaptive variable structure control, the adjustable range of torsional vibration is enlarged, the adaptability is stronger, vibration is damped under different torsional vibration through the current of the electromagnetic coil 3, the adjustability is realized, and compared with a silicone oil damper, the vibration damping effect is better. The vibration reduction is to consume energy for torsional vibration, friction is generated between the inertia block 4 and magnetorheological fluid, the product of the friction force and the rotating distance of the inertia block 4 is regulated through self-adaptive sliding mode control, and the maximum acting is obtained instead of simple torque increase, so that the resistance of the magnetorheological fluid is increased, namely the current is increased.
Under the present embodiment, the adjusting step includes a judging unit for judging whether the magnitude change direction of the torsional angular velocity is the increase or decrease of the torsional angular velocity in the case of increasing the current of the electromagnetic coil 3 or decreasing the current of the electromagnetic coil 3; the magnitude of the torsional vibration angular velocity can fluctuate, under a certain fluctuation range, the current of the electromagnetic coil 3 is not changed, the current of the electromagnetic coil 3 is prevented from continuously changing, and the fluctuation range can be below 5 percent.
Under the condition that the current of the electromagnetic coil 3 is increased, if the current torsional vibration angular speed is larger than the previous torsional vibration angular speed, the current of the electromagnetic coil 3 is reduced in order to increase the current, if the current torsional vibration angular speed is smaller than the previous torsional vibration angular speed, the current of the electromagnetic coil 3 is continuously increased, and whether the current is increased or not is continuously detected, so that the torsional vibration angular speed is reduced is further detected; the current torsional angular velocity is the torsional angular velocity obtained again after the current of the electromagnetic coil 3 is changed; the previous torsional angular velocity is the torsional angular velocity obtained after the current of the electromagnetic coil 3 is changed for the previous time, and when the rotating speed of the crankshaft starts to increase from 0, the controller 6 increases the current of the electromagnetic coil 3;
under the condition of reducing the current of the electromagnetic coil 3, if the current torsional vibration angular speed is larger than the previous torsional vibration angular speed, the current of the electromagnetic coil 3 is increased in order to reduce the current, if the current torsional vibration angular speed is smaller than the previous torsional vibration angular speed, the current of the electromagnetic coil 3 is reduced, and whether the current is reduced or not is continuously detected;
and a control current I is preset, and the current of the control electromagnetic coil 3 is smaller than the control current I. The control current I is the maximum current that the electromagnetic coil 3 can accept, and the magnetorheological fluid becomes solid under the magnetic field generated by the current, so the current of the electromagnetic coil 3 needs to be controlled to be smaller than the control current I to prevent the magnetorheological fluid from becoming solid.
In the embodiment, the electromagnetic coil 3 is divided into a plurality of arc segments, and the energizing current is preset in the judging unit; the electric quantity in the controller 6 can be saved by independently controlling each arc section, so that the power supply of the controller 6 is prevented from being changed frequently, and on the other hand, if the current of a single arc section is smaller than the energizing current, the resistance to the inertia block 4 is a, and if the electromagnetic coil 3 is whole, the resistance to the inertia block 4 is a, the current is required to be far smaller than the energizing current because the range of affecting the magnetorheological fluid is large, the tiny current is difficult to control, and the smaller the current is, the more difficult the magnetic field affects the resistance of the magnetorheological fluid, so that the effect is insufficient.
When the current of the electromagnetic coil 3 is increased, if a non-energized arc section exists, the current of the energized arc section is increased to the energized current, and the non-energized arc section is energized;
if the current of all the arc sections is larger than or equal to the electrified current, the current of the electromagnetic coil 3 is increased at the same time;
when the current of the electromagnetic coil 3 is reduced, if the current of all the arc-shaped sections is larger than the energizing current, the current of the electromagnetic coil 3 is reduced at the same time;
if the current of all the arc segments is equal to the electrified current or the non-electrified arc segments exist, selecting one of the electrified arc segments to reduce the current of the arc segments, and simultaneously controlling the current of the rest of the electrified arc segments to be unchanged. When the current is greater than the energizing current, the currents of all the arc-shaped sections are controlled simultaneously, so that heat dissipation can be better carried out, generation of all the positions of the inertia block 4 is uniform, heat dissipation is convenient, and heat is prevented from being accumulated in a certain arc-shaped section.
The arc sections are electrified or powered off at intervals, namely under the condition that one arc section is electrified, if the other arc section is electrified, the arc sections separated by the electrified arc sections are electrified, or the opposite arc sections are electrified instead of the adjacent arc sections, so that on one hand, heat dissipation is facilitated, on the other hand, the resistance distribution born by the inertia block 4 is uniform, and the inertia block 4 is prevented from colliding with the inner wall of the damping cavity in the rotation process.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (3)
1. The variable damping vibration attenuation mechanism of the high-power marine engine is characterized in that: including casing (1) with bent axle free end fixed connection, casing (1) include upper cover (11) and with upper cover (11) fixed connection's lower cover (12), upper cover (11) with be formed with between lower cover (12) and hold the chamber, hold the intracavity fixedly connected with annular magnet blocking ring (2) in order to separate hold the chamber, form electromagnetic cavity and damping chamber, electromagnetic cavity is provided with annular solenoid (3), the suspension of damping intracavity has annular inertial mass (4) to be full of magnetorheological fluid, casing (1) outside is provided with controller (6), controller (6) with solenoid (3) electric connection, inertial mass (4) include integrated into one piece's outer loop (41) and inner loop (42), the width of outer loop (41) is greater than the width of inner loop (42), one side of outer loop (41) orientation magnet blocking ring (2) is seted up at least one first recess 411), first recess (412) are provided with annular solenoid (3) in the damping intracavity suspension has annular inertial mass (6) to be full of magnetorheological fluid, the casing (1) outside is provided with controller (6) with solenoid (3) electric connection, outer loop (41) including annular center pin (41) are provided with annular center pin (41) circumference, annular center pin (41) is provided with annular center pin (41), the upper cover (11) and the lower cover (12) are provided with a first annular groove (13) and a second annular groove (14) on the outer side face, the depth of the first annular groove (13) is smaller than that of the second annular groove (14), the inner diameter of the first annular groove (13) is larger than the outer diameter of the second annular groove (14), the two second annular grooves (14) are located on two opposite sides of the inner ring (42), the cross sections of the first groove (411) and the second groove (412) are rectangular, the range of the ratio of the cross section area of the second groove (412) to the cross section area of the first groove (411) is 0.5-0.8, and the range of the ratio of the depth of the second groove (412) to the depth of the first groove (411) is 0.7-0.8.
2. The variable damping vibration attenuation method for the high-power marine engine is characterized by comprising the following steps of: the variable damping vibration attenuation mechanism for the high-power generator comprises the variable damping vibration attenuation mechanism for the high-power generator, an encoder arranged at the free end of a crankshaft and a rotation speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for collecting the instantaneous angular velocity of the free end of the crankshaft in real time, and the rotating speed sensor is used for collecting the average angular velocity of the flywheel end of the crankshaft;
the detection step comprises: the controller (6) receives the instantaneous angular velocity and the average angular velocity in real time, and obtains the torsional angular velocity through the difference value;
and (3) adjusting: the controller (6) adjusts the current of the electromagnetic coil (3) through self-adaptive sliding mode control according to the change of the torsional vibration angular speed;
the adjusting step comprises a judging unit, wherein the judging unit is used for judging the change direction of the torsional vibration angular speed under the condition of increasing the current of the electromagnetic coil (3) or reducing the current of the electromagnetic coil (3);
under the condition that the current of the electromagnetic coil (3) is increased, if the current torsional angular velocity is larger than the previous torsional angular velocity, the current of the electromagnetic coil (3) is reduced in order to increase the current, if the current torsional angular velocity is smaller than the previous torsional angular velocity, the current of the electromagnetic coil (3) is continuously increased, and whether the current is increased or not is continuously detected, so that the torsional angular velocity is reduced is further detected;
under the condition that the current of the electromagnetic coil (3) is reduced, if the current torsional angular velocity is larger than the previous torsional angular velocity, the current of the electromagnetic coil (3) is increased in order to reduce the current, and if the current torsional angular velocity is smaller than the previous torsional angular velocity, the current of the electromagnetic coil (3) is reduced, and whether the current is reduced or not is continuously detected;
the control current I is preset, and the current of the control electromagnetic coil (3) is smaller than the control current I;
the electromagnetic coil (3) is divided into a plurality of arc-shaped sections, and energizing current is preset in the judging unit;
when the current of the electromagnetic coil (3) is increased, if the non-energized arc-shaped section exists, the current of the energized arc-shaped section is increased to the preset energizing current, and the non-energized arc-shaped section is energized;
if the current of all the arc sections is larger than or equal to the preset electrifying current, the current of the electromagnetic coil (3) is increased at the same time;
when the current of the electromagnetic coil (3) is reduced, if the current of all the arc-shaped sections is larger than the preset electrifying current, the current of the electromagnetic coil (3) is reduced at the same time;
if the current of all the arc segments is equal to the preset electrifying current or the arc segments which are not electrified exist, selecting one electrified arc segment, reducing the current of the arc segments, and simultaneously controlling the current of the rest electrified arc segments to be unchanged.
3. The variable damping vibration attenuation method of a high-power marine engine according to claim 2, characterized in that: the arc segments are powered on or powered off at intervals.
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