CN114909425A - Variable-damping vibration attenuation mechanism of high-power marine engine and method thereof - Google Patents
Variable-damping vibration attenuation mechanism of high-power marine engine and method thereof Download PDFInfo
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- CN114909425A CN114909425A CN202210453274.0A CN202210453274A CN114909425A CN 114909425 A CN114909425 A CN 114909425A CN 202210453274 A CN202210453274 A CN 202210453274A CN 114909425 A CN114909425 A CN 114909425A
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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
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, and the variable damping vibration attenuation mechanism comprises a shell fixedly connected with the free end of a crankshaft, the shell comprises an upper cover and a lower cover fixedly connected with the upper cover, an electromagnetic coil is arranged in an electromagnetic cavity, the distance between the electromagnetic coil and an effective working area of magnetorheological fluid is controlled to control the magnetic field intensity, a magnetic resistance ring is arranged, the material of the magnetic resistance ring is steel and is not magnetic, so that the magnetic field generated by the magnetorheological coil can avoid the magnetic resistance 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, an outer ring is close to the magnetic resistance ring and is closer to the magnetic field generated by the electromagnetic coil, the viscosity change of the magnetorheological fluid at the position is more sensitive, and the contact area between an inertia block and the magnetorheological fluid at the position is increased, the contact area is increased by forming the first groove.
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 the marine diesel engine, the marine diesel engine is provided with a high-power engine, power is transmitted through a crankshaft in the high-power engine, torsional vibration can be generated between the crankshaft and the engine due to the fact that the crankshaft comprises a flywheel end and a free end, and a silicone oil damper is arranged at the free end of the crankshaft in order to reduce the torsional vibration;
however, the silicone oil damper has a small damping range and has a limitation on the damping effect, and the silicone oil damper cannot effectively damp all rotating speed working conditions of the marine engine, can only control vibration under a preset designated rotating speed frequency, and has a poor damping effect on torsional vibration at other rotating speeds.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a variable damping vibration attenuation mechanism of a high-power marine engine and a method thereof, which are used for expanding the vibration attenuation range of a crankshaft and effectively attenuating vibration.
In order to achieve the purpose, the invention provides the following technical scheme: the variable-damping vibration attenuation mechanism of the high-power marine engine comprises a shell fixedly connected with the free end of a crankshaft, wherein the shell comprises an upper cover and a lower cover fixedly connected with the upper cover, a containing cavity is formed between the upper cover and the lower cover, an annular magnetic resistance ring fixedly connected with the containing cavity is used for separating the containing cavity to form an electromagnetic cavity and a damping cavity, an annular electromagnetic coil is arranged in the electromagnetic cavity, an annular inertia block is suspended in the damping cavity and is full of magnetorheological fluid, a controller is arranged on the outer side of the shell, and the controller is electrically connected with the electromagnetic coil.
As a further improvement of the present invention, the inertia block includes an outer ring and an inner ring which are integrally formed, the width of the outer ring is greater than the width of the inner ring, one side of the outer ring facing the magnetism-resisting ring is provided with at least one first groove, and the first groove is annularly arranged along the circumferential direction of the central axis of the outer ring.
As a further improvement of the invention, two opposite sides of the outer ring are both provided with second grooves, 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 pad.
As a further improvement of the present invention, the outer side surfaces of the upper cover and the lower cover are both provided with a first ring groove and a second ring groove, the depth of the first ring groove is smaller than that of the second ring groove, the inner diameter of the first ring groove is larger than the outer diameter of the second ring groove, and the two second ring grooves are located on two opposite sides of the inner ring.
As a further improvement of the present invention, the first groove and the second groove are each rectangular in cross section, and a ratio of a cross-sectional area of the second groove to a cross-sectional area of the first groove ranges from 0.5 to 0.8, and a ratio of a depth of the second groove to a depth of the first groove ranges from 0.7 to 0.8.
The variable damping vibration attenuation method of the high-power marine engine comprises the variable damping vibration attenuation mechanism of the high-power generator, an encoder arranged at the free end of a crankshaft and a rotating speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for acquiring the instantaneous angular speed of the free end of the crankshaft in real time, and the rotating speed sensor is used for acquiring the average angular speed of the flywheel end of the crankshaft;
a detection step: the controller receives the instantaneous angular velocity and the average angular velocity in real time, and obtains the torsional vibration 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 angular velocity.
As a further improvement of the present invention, the adjusting step includes a judging unit for judging a direction of change in magnitude of the torsional angular velocity with increasing 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 velocity is greater than the previous torsional vibration angular velocity, the current of the electromagnetic coil is reduced, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, 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 velocity is greater than the previous torsional vibration angular velocity, the current of the electromagnetic coil is increased, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, the current of the electromagnetic coil is reduced;
and presetting a control current I, wherein the current of the control electromagnetic coil is smaller than the control current I.
As a further improvement of the present invention, the electromagnetic coil is divided into a plurality of arc-shaped sections, and an energizing current is preset in the judgment unit;
when the current of the electromagnetic coil is increased, if the arc-shaped section which is not electrified exists, the current of the electrified arc-shaped section is increased to the electrified current, and the arc-shaped section which is not electrified is electrified;
if the current of all the arc sections is larger than or equal to the electrifying 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 electrifying current, the current of the electromagnetic coil is reduced at the same time;
and if the current of all the arc sections is equal to the electrified current or the arc sections which are not electrified exist, selecting the electrified arc section to reduce the current of the electrified arc section, and simultaneously controlling the current of the rest electrified arc sections to be unchanged.
As a further improvement of the invention, the arc-shaped segment is powered on or off at intervals.
The invention has the beneficial effects that: the invention controls the electromagnetic coil to damp through the controller, enlarges the damping range, arranges the electromagnetic coil in the electromagnetic cavity, namely the shell, controls the distance between the electromagnetic coil and the effective working area of the magnetorheological fluid, controls the magnetic field intensity, prevents the upper cover and the lower cover from influencing the magnetic field, arranges the magnetic resistance ring, the material of the magnetic resistance ring is steel and is not magnetic, on one hand, the magnetic resistance ring prevents the magnetorheological fluid in the damping cavity from flowing into the electromagnetic cavity to form sealing, on the other hand, the arrangement of the magnetic resistance ring ensures that the magnetic field generated by the magnetorheological coil can avoid the magnetic resistance ring from entering the damping cavity, enlarges the radius of the magnetic field, ensures that the magnetorheological fluid can be influenced by the magnetic field, effectively controls the resistance of the magnetorheological fluid, the outer ring is close to the magnetic resistance ring and is closer to the magnetic field generated by the electromagnetic coil, ensures that the viscosity change of the magnetorheological fluid at the position is more sensitive, and increases the contact area of the inertia block and the magnetorheological fluid at the position, the contact area is increased by arranging the first groove, so that after the current of the electromagnetic coil is changed, the reaction of the magnetorheological fluid is quicker.
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 at A of FIG. 2 of the present invention;
fig. 4 is a schematic structural view of the inertial mass of 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 resistance 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. a wear pad.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Referring to fig. 1 to 4, the variable damping vibration damping mechanism of the high-power marine engine of the present embodiment includes a housing 1 fixedly connected to a free end of a crankshaft, and since the instantaneous angular velocity of the free end of the crankshaft is greater than that of a flywheel end, the variable damping vibration damping mechanism is disposed at the free end of the crankshaft, the vibration damping effect is better, the flywheel end detects the 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 magnetic resistance ring 2 is fixedly connected to the receiving cavity to partition the receiving cavity to form an electromagnetic cavity and a damping cavity, the magnetic resistance ring 2 is made of steel and is non-magnetic, on one hand, the magnetic resistance ring 2 prevents magnetorheological fluid in the damping cavity from flowing into the electromagnetic cavity to form a seal, on the other hand, the magnetic resistance ring 2 is disposed to make a magnetic field generated by a magnetic current coil to bypass the magnetic resistance ring 2 and enter the damping cavity, the radius of a magnetic field is enlarged, so that 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 coil and an effective working area of the magnetorheological fluid is controlled, the magnetic field intensity is controlled, the influence of an upper cover 11 and a 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 can pass 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 supply wire, under the common condition, a silicon oil damper is used for damping on a crankshaft, the damping range of the silicon oil damper is small, and the silicon oil damper cannot be effective for all rotating speed working conditions of a marine damping engine, the vibration can be controlled only by aiming at the vibration under the preset designated rotating speed frequency, the torsional vibration damping effect under other rotating speeds is poor, the current of the electromagnetic coil 3 is controlled through the controller 6, so that the viscosity of the magnetorheological fluid is controlled, the frictional resistance between the magnetorheological fluid and the inertia block 4 is changed, work is done between the rotating distance and the frictional resistance through the inertia rotation of the inertia block 4, heat is generated, the energy of the torsional vibration is consumed, the vibration damping effect is achieved, the vibration damping device can be controlled through different current magnitudes under different torsional vibrations, the adjustment is carried out through the self-adaptive sliding mode control in the controller 6, and the current with the minimum torsional vibration is obtained in the continuous balancing process of the current magnitudes under different diesel engine rotating speeds.
The vibration reduction is carried out by the electromagnetic coil 3, the magnetorheological fluid and the inertia block 4, the regulation range is large, but the current regulation maximum point is formed, 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 resistance ring 2, the first groove 411 is circumferentially and annularly arranged along the central axis of the outer ring 41, the outer ring 41 is close to the magnetic resistance ring 2 and is closer to the magnetic field generated by the electromagnetic coil 3, so that the change of the viscosity of the magnetorheological fluid at the position is more sensitive, the contact area of the inertia block 4 and the magnetorheological fluid at the position is increased, the contact area is increased by forming the first groove 411, after the current of the electromagnetic coil 3 is changed, the reaction of the magnetorheological fluid is quicker, the friction resistance is increased, and the energy loss in vibration reduction is facilitated.
The two opposite sides of the outer ring 41 are both provided with a second groove 412, the second grooves 412 are circumferentially and annularly arranged along the central axis of the outer ring 41, on one hand, the contact area between the two opposite side surfaces of the outer ring 41 and the magnetorheological fluid is increased, on the other hand, the outer ring 41 and the inner ring 42 are increased, particularly, the stability of the inner ring 42 due to inertial rotation is increased, and the inner ring 42 is prevented from being suddenly increased in resistance at the first groove 411 on the outer ring 41, so that the resistance difference between the magnetorheological fluid at the first groove 411 and the magnetorheological fluid at other positions is too large, the inner ring 42 transversely swings to collide with the upper cover 11 or the lower cover 12, and the inertia block 4, the upper cover 11 and the lower cover 12 are damaged.
Referring to fig. 2 and 3, the bottom wall of the damping chamber is fixedly connected with an annular wear pad 7, so that the inertia block 4 is prevented from being directly contacted with the bottom wall of the damping chamber in the inertia movement process, and the inertia block 4 or the shell 1 is prevented from being damaged.
First annular groove 13 and second annular groove 14 have all been seted up to upper cover 11 and 12 lateral surfaces of lower cover, the degree of depth of first annular groove 13 is less than the degree of depth of second annular groove 14, the internal diameter of first annular groove 13 is greater than the external diameter of second annular groove 14, two second annular grooves 14 are located the relative both sides of inner ring 42, first annular groove 13 and second annular groove 14 are used for the heat dissipation, increase heat radiating area, second annular groove 14 is used for remedying the heat radiating area of first annular groove 13, make the heat that inner ring 42 department produced in carrying out the heat dissipation process through first annular groove 13, also can pass through inner ring 42, then disperse through second annular groove 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 0.5-0.8, the range of the ratio of the depth of the second groove 412 to the depth of the first groove 411 is 0.7-0.8, the cross section area of the part located in the middle position of the first groove 411 is larger, so that the resistance borne by 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 energy of shaking left and right of the inertia block 4, the shaking is limited by increasing the resistance of shaking left and right, and meanwhile, the resistance of rotation of the inertia block 4 is increased.
The variable damping vibration attenuation method of the high-power marine engine comprises the variable damping vibration attenuation mechanism of the high-power generator, an encoder arranged at the free end of a crankshaft and a rotating speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for acquiring the instantaneous angular speed of the free end of the crankshaft in real time, and the rotating speed sensor is used for acquiring the average angular speed of the flywheel end of the crankshaft; the rotating speed sensor obtains the rotating speed of the flywheel end and then calculates the average angular speed of the flywheel end
A detection step: the controller 6 receives the instantaneous angular velocity and the average angular velocity in real time, and obtains the torsional vibration 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 size of adjusting solenoid 3 through self-adaptation variable structure control promptly has enlarged the adjustable range to torsional oscillation, and adaptability is stronger, under the torsional oscillation of difference, under the current size of solenoid 3 through the difference, carries out the damping to realized adjustable, compared in the silicon oil shock absorber, the damping effect is better. The vibration reduction is to consume energy for torsional vibration, the friction is generated between the inertia block 4 and the magnetorheological fluid, the product of the friction force and the rotation distance of the inertia block 4 is adjusted through self-adaptive sliding mode control, the maximum work is obtained, the simple torque is not increased, and the resistance of the magnetorheological fluid is increased, namely the current is increased.
In this embodiment, the adjusting step includes a determining unit, which is configured to determine a magnitude change direction of the torsional angular velocity when the current of the electromagnetic coil 3 is increased or decreased, where the magnitude change direction is whether the torsional angular velocity is increased or decreased; the magnitude of the torsional vibration angular velocity can fluctuate, the current of the electromagnetic coil 3 is not changed in a certain fluctuation range, the current of the electromagnetic coil 3 is prevented from changing constantly, and the fluctuation range can be less than 5 percent.
Under the condition of increasing the current of the electromagnetic coil 3, if the current torsional vibration angular velocity is greater than the previous torsional vibration angular velocity, in order to increase the current and increase the torsional vibration angular velocity on the contrary, the current of the electromagnetic coil 3 is reduced, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, the current of the electromagnetic coil 3 is continuously increased, the current is continuously detected to increase, and whether the torsional vibration angular velocity is reduced or not is continuously detected; the current torsional angular velocity is obtained again after the current of the electromagnetic coil 3 is changed; the former torsional vibration angular velocity is the torsional vibration 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 is increased 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 velocity is greater than the previous torsional vibration angular velocity, in order to reduce the current and increase the torsional vibration angular velocity, the current of the electromagnetic coil 3 is increased, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, the current of the electromagnetic coil 3 is reduced, the current reduction is continuously detected, and whether the torsional vibration angular velocity is reduced or not is 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 acceptable to the electromagnetic coil 3, and the magnetic field generated by the control current I makes the magnetorheological fluid become solid, so that the current required to control the electromagnetic coil 3 is smaller than the control current I to prevent the magnetorheological fluid from becoming solid.
In the present embodiment, the electromagnetic coil 3 is divided into a plurality of arc-shaped segments, and the energization current is preset in the determination unit; the arc sections are controlled independently, on one hand, the electric quantity in the controller 6 can be saved, the situation that the power supply of the controller 6 is frequently replaced is avoided, on the other hand, if the current of a single arc section is smaller than the electrifying current, the resistance generated by the single arc section to the inertia block 4 is a, and if the electromagnetic coil 3 is the whole, the resistance generated by the electromagnetic coil 4 is a, the effect is insufficient because the range of the magnetorheological fluid is large, the current needs to be far smaller than the electrifying current, the tiny current is difficult to control, and the smaller the current is, the more difficult the magnetic field is to influence the resistance of the magnetorheological fluid.
When the current of the electromagnetic coil 3 is increased, if the arc-shaped section which is not electrified exists, the current of the electrified arc-shaped section is increased to the electrified current, and the arc-shaped section which is not electrified is electrified;
if the current of all the arc sections is larger than or equal to the 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 sections is larger than the electrified current, the current of the electromagnetic coil 3 is reduced at the same time;
if the current of all the arc sections is equal to the electrified current or the arc sections which are not electrified exist, one electrified arc section is selected, the current of the electrified arc section is reduced, and meanwhile, the current of the rest electrified arc sections is controlled to be unchanged. When the current is greater than the electrifying current, the currents of all the arc sections are controlled simultaneously, heat dissipation can be better performed, the positions of the inertia blocks 4 are uniform in generation, heat dissipation is facilitated, and heat is prevented from being gathered in a certain arc section.
The segmental arc carries out interval circular telegram or outage, has a segmental arc under the circular telegram circumstances promptly, if will switch on another segmental arc, then select the segmental arc that has switched on is separated from to switch on, or select its relative segmental arc to switch on, but adjacent segmental arc is switched on, on the one hand, the heat dissipation of being convenient for, on the other hand for the resistance that inertia piece 4 received distributes evenly, prevents that inertia piece 4 from rotating the inner wall of process and damping chamber and colliding.
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-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. High-power marine engine becomes damping vibration attenuation mechanism, its characterized in that: including casing (1) with bent axle free end fixed connection, casing (1) including 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 intracavity fixedly connected with annular magnetic resistance ring (2), in order to separate hold the chamber, form electromagnetic cavity and damping chamber, the electromagnetic intracavity is provided with annular solenoid (3), the damping intracavity suspension has annular inertia piece (4) to be full of magnetorheological suspensions, the casing (1) outside is provided with controller (6), controller (6) with solenoid (3) electric connection.
2. The variable damping vibration attenuation mechanism of the high-power marine engine according to claim 1, characterized in that: the inertia block (4) comprises an outer ring (41) and an inner ring (42) which are integrally formed, the width of the outer ring (41) is larger than that of the inner ring (42), at least one first groove (411) is formed in one side, facing the magnetism blocking ring (2), of the outer ring (41), and the first groove (411) is circumferentially and annularly arranged along the central axis of the outer ring (41).
3. The variable damping vibration attenuation mechanism of the high-power marine engine according to claim 2, characterized in that: second grooves (412) are formed in two opposite sides of the outer ring (41), and the second grooves (412) are circumferentially and annularly arranged along the central axis of the outer ring (41).
4. The variable damping vibration attenuation mechanism of the high-power marine engine according to claim 1, characterized in that: the bottom wall of the damping cavity is fixedly connected with an annular wear-resistant pad (7).
5. The variable damping vibration attenuation mechanism of the high-power marine engine according to claim 2, characterized in that: upper cover (11) with first annular (13) and second annular (14) have all been seted up to lower cover (12) lateral surface, the degree of depth of first annular (13) is less than the degree of depth of second annular (14), the internal diameter of first annular (13) is greater than the external diameter of second annular (14), two second annular (14) are located the both sides that inner ring (42) are relative.
6. The variable damping vibration attenuation mechanism of the high-power marine engine according to claim 3, characterized in that: the first groove (411) and the second groove (412) are each rectangular in cross section, and the ratio of the cross-sectional area of the second groove (412) to the cross-sectional area of the first groove (411) ranges from 0.5 to 0.8, and the ratio of the depth of the second groove (412) to the depth of the first groove (411) ranges from 0.7 to 0.8.
7. The variable damping vibration attenuation method of the high-power marine engine is characterized in that: the variable damping vibration attenuation mechanism comprises the variable damping vibration attenuation mechanism of the generator for high power as claimed in any one of claims 1 to 6, an encoder arranged at the free end of a crankshaft and a rotating speed sensor arranged at the flywheel end of the crankshaft;
the encoder is used for acquiring the instantaneous angular speed of the free end of the crankshaft in real time, and the rotating speed sensor is used for acquiring the average angular speed of the flywheel end of the crankshaft;
a detection step: the controller (6) receives the instantaneous angular speed and the average angular speed in real time, and obtains the torsional vibration angular speed 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.
8. The variable damping vibration attenuation method of the high-power marine engine according to claim 7, characterized in that: the adjusting step comprises a judging unit, and the judging unit is used for judging the size change direction of the torsional vibration angular velocity under the condition of increasing the current of the electromagnetic coil (3) or reducing the current of the electromagnetic coil (3);
under the condition of increasing the current of the electromagnetic coil (3), if the current torsional vibration angular velocity is greater than the previous torsional vibration angular velocity, the current of the electromagnetic coil (3) is reduced, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, the current of the electromagnetic coil (3) is continuously increased;
under the condition of reducing the current of the electromagnetic coil (3), if the current torsional vibration angular velocity is greater than the previous torsional vibration angular velocity, the current of the electromagnetic coil (3) is increased, and if the current torsional vibration angular velocity is less than the previous torsional vibration angular velocity, the current of the electromagnetic coil (3) is reduced;
and presetting a control current I, wherein the current of the control electromagnetic coil (3) is smaller than the control current I.
9. The variable damping vibration attenuation method of the high-power marine engine according to claim 8, characterized in that: the electromagnetic coil (3) is divided into a plurality of arc-shaped sections, and the electrifying current is preset in the judging unit;
when the current of the electromagnetic coil (3) is increased, if the arc-shaped section which is not electrified exists, the current of the electrified arc-shaped section is increased to the electrified current, and the arc-shaped section which is not electrified is electrified;
if the currents of all the arc sections are larger than or equal to the electrifying current, the currents of the electromagnetic coils (3) are 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 electrifying current, the current of the electromagnetic coil (3) is reduced at the same time;
if the current of all the arc sections is equal to the electrified current or under the condition that the arc sections which are not electrified exist, one electrified arc section is selected, the current of the electrified arc section is reduced, and meanwhile, the current of the rest electrified arc sections is controlled to be unchanged.
10. The variable damping vibration attenuation method of the high-power marine engine according to claim 9, characterized in that: the arc-shaped section is electrified or powered off at intervals.
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