CN113503417B - Two-degree-of-freedom pipeline active dynamic vibration absorber and using method thereof - Google Patents
Two-degree-of-freedom pipeline active dynamic vibration absorber and using method thereof Download PDFInfo
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- CN113503417B CN113503417B CN202110888255.6A CN202110888255A CN113503417B CN 113503417 B CN113503417 B CN 113503417B CN 202110888255 A CN202110888255 A CN 202110888255A CN 113503417 B CN113503417 B CN 113503417B
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
- F16F15/085—Use of both rubber and metal springs
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
- F16F7/116—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on metal springs
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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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/04—Friction
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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
Abstract
The invention relates to a two-degree-of-freedom pipeline active dynamic vibration absorber and a using method thereof, wherein the vibration absorber comprises a longitudinal dynamic vibration absorbing mechanism, a transverse dynamic vibration absorbing mechanism and a rigidity adjusting mechanism; the longitudinal dynamic vibration absorption mechanism comprises a mass block, a steel plate spring supporting baffle and a vibration absorber base; the mass block consists of an upper half of the mass block, a lower half of the mass block, a roller shaft and rollers arranged at the periphery of the sub-shaft; a through hole is formed in the center of the mass block, and the multi-layer laminated steel plate springs penetrate through the through hole; the roller is in rolling contact with the surfaces of the stacked leaf springs, and the axial line of the roller is vertical to the central line of the through hole; the invention only uses one driving part to complete the rigidity adjustment of two degrees of freedom, thereby achieving the vibration absorption frequency adjustment, reducing the weight of the vibration absorber and simplifying the control process.
Description
The technical field is as follows:
the invention relates to a two-degree-of-freedom pipeline active dynamic vibration absorber and a using method thereof, and belongs to the technical field of vibration reduction.
Background art:
pipe systems are used in many fields, primarily for the transport of fluids, and play a considerable role in the operation of mechanical devices. The pipeline inevitably vibrates in the working process, wherein the vibration is generated due to the flow and pressure pulsation of the internal liquid, and the vibration generated by power equipment connected with the pipeline is transmitted to a pipeline system; the strong vibration can lead to the looseness of the pipeline connection part, lead to the generation of fatigue wear, reduce the service life of the pipeline and even generate fracture, so that the adoption of an effective method for reducing the vibration level of the pipeline has important engineering significance.
The pipeline is fixed in the existing pipeline vibration damping product mainly by adopting a rubber block or a rigid clamp, and although the rubber block has a vibration damping effect, the rubber block has high requirement on the temperature of a working environment, has short service life and needs to be replaced frequently; the rigid clip has no vibration damping effect.
The vibration control of the pipeline is realized by adopting a dynamic vibration absorber, a certain amount of research and documents are available at present, but most of the research is carried out on the traditional passive dynamic vibration absorber, in the actual working condition of the pipeline, because the uncertainty of fluid flow and the working frequency of power equipment connected with the pipeline cannot be constant, the vibration reduction frequency of the pipeline has a certain range, and when the passive dynamic vibration absorber with only one vibration reduction frequency is used for vibration reduction, the excitation frequency and the vibration reduction frequency of the dynamic vibration absorber generate a little deviation, so that the vibration reduction capability is greatly reduced. Although there have been some studies on active dynamic vibration absorbers, most of them can achieve dynamic vibration absorption with only a single degree of freedom, and the vibration of the pipe is multi-degree of freedom, so it is necessary to design a dynamic vibration absorber capable of dynamic vibration absorption with more than one degree of freedom, and also capable of actively controlling the vibration absorption frequency according to the excitation frequency.
The invention content is as follows:
the invention aims to provide a two-degree-of-freedom pipeline active dynamic vibration absorber and a using method thereof, and the two-degree-of-freedom pipeline active dynamic vibration absorber can solve the problem that the traditional passive dynamic vibration absorber is single in vibration absorbing frequency and the limitation that the general active dynamic vibration absorber can only carry out active dynamic vibration absorption on a single degree of freedom.
The invention relates to a two-degree-of-freedom pipeline active dynamic vibration absorber, which is characterized in that: the device comprises a longitudinal dynamic vibration absorption mechanism, a transverse dynamic vibration absorption mechanism and a rigidity adjusting mechanism;
the longitudinal dynamic vibration absorption mechanism comprises a mass block, a steel plate spring supporting baffle and a vibration absorber base; the mass block consists of an upper half of the mass block, a lower half of the mass block, a roller shaft and rollers arranged at the periphery of the sub-shaft; a through hole is formed in the center of the mass block, and the multi-layer laminated steel plate springs penetrate through the through hole; the roller is in rolling contact with the surfaces of the stacked leaf springs, and the axial line of the roller is vertical to the central line of the through hole; the upper parts of the steel plate spring supporting baffle and the vibration absorber base are respectively provided with a first groove and a second groove which are used for installing and supporting two ends of a steel plate spring,
the transverse dynamic vibration absorption mechanism comprises mass blocks, two groups of mass block baffles, a spiral spring, metal rubber, a variable stiffness baffle base and variable stiffness baffle top covers, wherein the two variable stiffness baffle top covers are fixedly connected with the upper part of the variable stiffness baffle base through baffle bolts and baffle nuts through fifth grooves in the lower parts of the two variable stiffness baffle top covers; the lower part of the mass block baffle is provided with a groove which is connected with a bulge on the vibration absorber base for guiding and limiting; the top covers of the two groups of variable-stiffness baffles and the upper parts of the mass block baffles are respectively provided with a third groove and a fourth groove so as to be in limit sleeve joint with two ends of the spiral spring and the metal rubber; the steel plate spring also penetrates through the variable-stiffness baffle top cover and the mass block baffle;
the rigidity adjusting mechanism comprises a rigidity changing baffle base, a rigidity changing baffle top cover, a ball screw, a speed reducer driving the ball screw to rotate and a servo motor driving the speed reducer to work, wherein the rigidity changing baffle base is in threaded connection with the ball screw through a threaded hole in the lower part; the left end of the ball screw is connected with the output end of the speed reducer, the input end of the speed reducer is connected with the output end of the servo motor, and the ball screw penetrates through a groove in the lower portion of the mass block baffle.
Furthermore, the vibration absorber base comprises a bottom plate and a side plate arranged on one side part of the bottom plate, the side plate is provided with the second groove, and the first groove arranged on the steel plate spring supporting baffle is opposite to the second groove.
Furthermore, the lower part of the steel plate spring supporting baffle is fixedly connected with the bottom plate of the vibration absorber base through bolts; the lower part of the variable-rigidity baffle base is provided with a groove which is connected with a bulge on the vibration absorber base for limiting sliding.
The invention relates to a working method of a two-degree-of-freedom pipeline active dynamic vibration absorber, which is characterized by comprising the following steps of: the two-degree-of-freedom pipeline active dynamic vibration absorber comprises a longitudinal dynamic vibration absorbing mechanism, a transverse dynamic vibration absorbing mechanism and a rigidity adjusting mechanism;
the longitudinal dynamic vibration absorption mechanism comprises a mass block, a steel plate spring supporting baffle and a vibration absorber base; the mass block consists of an upper half of the mass block, a lower half of the mass block, a roller shaft and rollers arranged at the periphery of the sub-shaft; a through hole is formed in the center of the mass block, and the multi-layer laminated steel plate springs penetrate through the through hole; the roller is in rolling contact with the surfaces of the stacked leaf springs, and the axial line of the roller is vertical to the central line of the through hole; the upper parts of the steel plate spring supporting baffle and the vibration absorber base are respectively provided with a first groove and a second groove which are used for installing and supporting two ends of a steel plate spring,
the transverse dynamic vibration absorption mechanism comprises mass blocks, two groups of mass block baffles, a spiral spring, metal rubber, a variable stiffness baffle base and variable stiffness baffle top covers, wherein the two variable stiffness baffle top covers are fixedly connected with the upper part of the variable stiffness baffle base through baffle bolts and baffle nuts through fifth grooves in the lower parts of the two variable stiffness baffle top covers; the lower part of the mass block baffle is provided with a groove which is connected with a bulge on the vibration absorber base for guiding and limiting; the top covers of the two groups of variable-stiffness baffles and the upper parts of the mass block baffles are respectively provided with a third groove and a fourth groove so as to be in limit sleeve joint with two ends of the spiral spring and the metal rubber; the steel plate spring also penetrates through the variable-stiffness baffle top cover and the mass block baffle;
the rigidity adjusting mechanism comprises a rigidity changing baffle base, a rigidity changing baffle top cover, a ball screw, a speed reducer driving the ball screw to rotate and a servo motor driving the speed reducer to work, wherein the rigidity changing baffle base is in threaded connection with the ball screw through a threaded hole in the lower part; the left end of the ball screw is connected with the output end of the speed reducer, the input end of the speed reducer is connected with the output end of the servo motor, and the ball screw penetrates through a groove in the lower part of the mass block baffle;
during installation, firstly, a ball screw penetrates through a threaded hole in the lower portion of the variable-rigidity baffle base, then the variable-rigidity baffle base is installed on the vibration absorber base, a groove in the lower portion of the variable-rigidity baffle base is embedded into a protrusion on the surface of the vibration absorber base, the right end of the ball screw is installed into a groove in the right side of the vibration absorber base, then the mass block baffle is installed, and the groove in the lower portion of the mass block baffle is embedded into the protrusion on the surface of the vibration absorber base; then, the laminated spring steel plate penetrates through the variable-stiffness baffle base and the mass block baffle, two ends of the laminated spring steel plate are embedded into a second groove and a first groove on the vibration absorber base, then the variable-stiffness baffle top cover is connected with the variable-stiffness baffle base through bolts and nuts, metal rubber and a spiral spring are embedded into a third groove and a groove on the variable-stiffness baffle top cover and the variable-stiffness baffle base, a cylindrical bulge of the variable-stiffness baffle top cover and a cylindrical bulge of the variable-stiffness baffle base are embedded into a hollow cylindrical bulge of the mass block baffle, the metal rubber and the spiral spring are embedded into a fourth groove of the mass block baffle, and finally the steel plate spring supporting baffle is connected with the vibration absorber base through bolts;
the principle of longitudinal dynamic vibration absorption is that when the device is excited by a longitudinal load, the mass block and the laminated steel plate spring as a longitudinal dynamic vibration absorption combination move longitudinally along with the excitation, so that the excitation energy applied to the device is transferred to the mass block. The laminated steel plate springs have a certain damping effect in the vibration absorption process due to the friction effect between layers in the bending process;
the transverse dynamic vibration absorption principle is that when the device is excited by transverse load, the mass block can transversely move on the steel plate spring due to the fact that the rollers are arranged in the mass block, and the transverse movement of the mass block is uniformly transmitted to the spiral spring and the metal rubber through the mass block baffle, so that the mass block, the mass block baffle, the spiral spring and the metal rubber can transversely move along with the excitation as the transverse dynamic vibration absorption combination, and the excitation energy borne by the device is transferred to the mass block; the metal rubber can generate friction among the metal wires in the compression process, so that a certain damping effect is achieved in the vibration absorption process;
the active control principle is that the servo motor drives the speed reducer to drive the ball screw to rotate, and the ball screw is in threaded connection with the variable-rigidity baffle base, so that the ball screw rotates to drive the variable-rigidity baffle base and the variable-rigidity baffle top cover to generate transverse displacement; firstly, the change of the transverse positions of the variable-stiffness baffle base and the variable-stiffness baffle top cover can change the working length of the steel plate spring, so that the stiffness of longitudinal dynamic vibration absorption is changed, and the frequency of the longitudinal dynamic vibration absorption is further changed; secondly, the transverse positions of the variable-stiffness baffle base and the variable-stiffness baffle top cover are changed, the precompression quantity of the spiral spring and the metal rubber is changed, and the rigidity of the metal rubber is increased along with the increase of the compression quantity, so that the rigidity of the metal rubber can be changed by adjusting the precompression quantity, and the transverse dynamic vibration absorption frequency is further changed.
The invention has the advantages and the application:
the invention solves the problem that the traditional passive dynamic vibration absorber has single vibration absorption frequency and the limitation that the general active dynamic vibration absorber can only carry out active dynamic vibration absorption on single degree of freedom. The two-degree-of-freedom active dynamic vibration absorber realizes two-degree-of-freedom active dynamic vibration absorption, and simultaneously completes the rigidity adjustment of two degrees of freedom by only one active component, thereby achieving the vibration absorption frequency adjustment, reducing the weight of the vibration absorber and simplifying the control process.
The invention adopts the traditional combination of the steel plate spring and the spiral spring metal rubber in the aspect of dynamic vibration absorption, and uses the servo motor, the speed reducer and the ball screw to carry out active control, and has the following advantages:
by adopting the active control technology, the vibration absorption frequency of the dynamic vibration absorber is changed by controlling the rigidity of the dynamic vibration absorption structure in two directions, and compared with the traditional passive dynamic vibration absorber, the vibration absorption frequency range of the passive dynamic vibration absorber is improved, and the application range is wider.
The mass block is connected through a special structure, so that the mass block has two-direction freedom degree and two-direction dynamic vibration absorption capacity. Compared with the traditional one-way active dynamic vibration absorber, the active dynamic vibration absorber has active dynamic vibration absorbing capacity in two directions and has better vibration absorbing effect.
The special structure is adopted, so that the rigidity change in two directions can be controlled only by one driving device, compared with the traditional active control system which needs an independent driving device for controlling each direction, the device can simplify the active control structure, reduce the mass and the volume of the vibration absorber and work in more limited environments.
Description of the drawings:
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a sectional view of a coil spring and metal rubber mounting part
Fig. 5 is a partial perspective view of the present invention.
The specific implementation mode is as follows:
the two-degree-of-freedom pipeline active dynamic vibration absorber comprises a longitudinal dynamic vibration absorbing mechanism, a transverse dynamic vibration absorbing mechanism and a rigidity adjusting mechanism, wherein the three parts are respectively inserted;
the longitudinal dynamic vibration absorption mechanism comprises a rectangular mass block 12, a steel plate spring 6, a steel plate spring supporting baffle 7 and a vibration absorber base 4; the mass block 12 consists of an upper mass block half 1201, a lower mass block half 1202, a roller shaft 1204 and rollers 1203 arranged on the periphery of the sub shaft 1204, wherein the upper mass block half 1201 and the lower mass block half 1202 can be cuboids which are independently processed, and then through holes for penetrating through the steel plate spring 6 are formed, or through holes and pore passages for penetrating the rollers are processed by a whole cuboid;
the steel plate spring 6 can pass through the through hole after being laminated by 3-8 layers; the roller 1203 is in rolling contact with the surface of the stacked leaf spring 6, so that the leaf spring 6 can roll smoothly in the length direction, and the axial line of the roller 1203 is vertical to the central line of the through hole; the upper parts of the steel plate spring supporting baffle 7 and the vibration absorber base 4 are respectively provided with a first groove 701 and a second groove 401 which are used for installing and supporting two ends of a steel plate spring 6; the vibration absorber base 4 includes a bottom plate and a side plate disposed at one side portion of the bottom plate, the side plate is provided with the second groove 401, and the first groove 701 disposed on the leaf spring support baffle 7 is opposite to the second groove 401.
The transverse dynamic vibration absorption mechanism comprises a mass block 12, two groups of mass block baffles 11, a spiral spring 9, metal rubber 10, a variable stiffness baffle base 1 and variable stiffness baffle top covers 8, wherein the mass block 12 is positioned between the two groups of mass block baffles 11, and the two groups of variable stiffness baffle top covers 8 are fixedly connected with the upper part of the variable stiffness baffle base 1 through baffle bolts 102 and baffle nuts 103 through fifth grooves 801 at the lower part; the lower part of the mass block 11 is provided with a groove 1103 (the groove 1103 also has a slotted hole avoiding a ball screw), and the groove 1103 is connected with a protrusion 403 on the vibration absorber base 4 for guiding and limiting; the upper parts of the two groups of variable stiffness baffle top covers 8 and the mass block baffle 11 are respectively provided with a third groove 802 and a fourth groove 1101 so as to be in limit socket joint with two ends of the spiral spring 9 and the metal rubber 10; the steel plate spring 6 also penetrates through the variable-stiffness baffle top cover 8 and the mass block 11; cylindrical protrusions 105 and hollow cylindrical protrusions 1102 for embedding the cylindrical protrusions 105 are arranged in the third groove 802 (and the grooves 104) and the fourth groove 1101 (two for each mass block 11), and the grooves at two ends are prevented from being separated by the spiral spring 9 and the metal rubber 10 through the sleeved fit of the cylindrical protrusions 105 and the hollow cylindrical protrusions 1102.
The rigidity adjusting mechanism comprises a rigidity changing baffle base 1, a rigidity changing baffle top cover 8, a ball screw 2, a speed reducer 3 for driving the ball screw 2 to rotate and a servo motor 5 for driving the speed reducer 3 to work, wherein the rigidity changing baffle base 1 is in threaded connection with the ball screw 2 through a threaded hole 101 in the lower part; the left end of the ball screw 2 is connected with the output end of the speed reducer 3, the input end of the speed reducer 3 is connected with the output end of the servo motor 5, and the ball screw 2 penetrates through a groove 1103 in the lower part of the mass block 11.
The lower part of the steel plate spring supporting baffle 7 is fixedly connected with the bottom plate of the vibration absorber base 4 through bolts 702; the lower part of the variable stiffness baffle base 1 is provided with a sixth groove 106 which is connected with a bulge 403 on the vibration absorber base 4 for limited sliding.
The invention relates to a working method of a two-degree-of-freedom pipeline active dynamic vibration absorber,
during installation, firstly, the ball screw 2 penetrates through a threaded hole in the lower part of the variable-rigidity baffle base 1, then the variable-rigidity baffle base 1 is installed on the vibration absorber base 4, a groove in the lower part of the variable-rigidity baffle base 1 is embedded into a protrusion on the surface of the vibration absorber base 4, the right end of the ball screw is installed into a groove 402 in the right side of the vibration absorber base 4, then the mass block 11 is installed, and the groove in the lower part of the mass block 11 is embedded into the protrusion on the surface of the vibration absorber base 4; then, the laminated spring steel plate 6 penetrates through the variable stiffness baffle base 1 and the mass block baffle 11, two ends of the laminated spring steel plate are embedded into a second groove 401 and a first groove 701 on the vibration absorber base 4, then the variable stiffness baffle top cover 8 is connected with the variable stiffness baffle base 1 through a bolt 102 and a nut 103, the metal rubber 9 and the spiral spring 10 are embedded into a third groove 802 and a groove 104 on the variable stiffness baffle top cover 8 and the variable stiffness baffle base 1, a cylindrical bulge 803 of the variable stiffness baffle top cover 8 and a cylindrical bulge 105 of the variable stiffness baffle base 1 are embedded into a hollow cylindrical bulge 1102 of the mass block 11, the metal rubber 9 and the spiral spring 10 are embedded into a fourth groove 1101 of the mass block 11, and finally the steel plate spring support baffle 7 is connected with the vibration absorber base 4 through a bolt 702;
the principle of longitudinal dynamic vibration absorption is that when the device is excited by a longitudinal load, the mass 12 and the laminated leaf spring 6 act as a longitudinal dynamic vibration absorption combination to move longitudinally with the excitation, thereby transferring the excitation energy to the mass. The laminated steel plate springs have a certain damping effect in the vibration absorption process due to the friction effect between layers in the bending process;
the transverse dynamic vibration absorption principle is that when the device is excited by transverse load, the mass block 12 can transversely move on the steel plate spring due to the rollers 1203 arranged in the mass block 12, and the transverse movement of the mass block 12 is uniformly transmitted to the spiral spring 10 and the metal rubber 9 through the mass block 11. Therefore, the mass baffle 11, the coil spring 10 and the metal rubber 9 as a transverse dynamic vibration absorbing combination can move transversely along with the excitation, so that the excitation energy applied to the device is transferred to the mass. The metal rubber can generate friction among the metal wires in the compression process, so that a certain damping effect is achieved in the vibration absorption process;
the active control principle is that the servo motor 5 drives the speed reducer 3 to drive the ball screw 2 to rotate, and the ball screw 2 is in threaded connection with the variable-rigidity baffle base 1, so that the ball screw 2 rotates to drive the variable-rigidity baffle base 1 and the variable-rigidity baffle top cover 8 to generate transverse displacement. First, the change in the lateral position of the variable stiffness damper base 1 and variable stiffness damper top cover 8 changes the working length of the leaf spring 6, thereby changing the stiffness of the longitudinal dynamic vibration absorption and thus the longitudinal dynamic vibration absorption frequency. Secondly, the horizontal positions of the variable-stiffness baffle base 1 and the variable-stiffness baffle top cover 8 are changed, the precompression amount of the spiral spring 10 and the metal rubber 9 is changed, and the stiffness of the metal rubber is increased along with the increase of the compression amount, so that the stiffness of the metal rubber 9 can be changed by adjusting the precompression amount, and further the horizontal dynamic vibration absorption frequency is changed.
The invention has the advantages and the application:
the invention solves the problem that the traditional passive dynamic vibration absorber has single vibration absorption frequency and the limitation that the general active dynamic vibration absorber can only carry out active dynamic vibration absorption on single degree of freedom. The two-degree-of-freedom active dynamic vibration absorber realizes two-degree-of-freedom active dynamic vibration absorption, and simultaneously completes the rigidity adjustment of two degrees of freedom by only one active component, thereby achieving the vibration absorption frequency adjustment, reducing the weight of the vibration absorber and simplifying the control process.
The invention adopts the traditional combination of the steel plate spring and the spiral spring metal rubber in the aspect of dynamic vibration absorption, and uses the servo motor, the speed reducer and the ball screw to carry out active control, and has the following advantages:
by adopting the active control technology, the vibration absorption frequency of the dynamic vibration absorber is changed by controlling the rigidity of the dynamic vibration absorption structure in two directions, and compared with the traditional passive dynamic vibration absorber, the vibration absorption frequency range of the passive dynamic vibration absorber is improved, and the application range is wider.
The mass block is connected through a special structure, so that the mass block has two-direction freedom degree and two-direction dynamic vibration absorption capacity. Compared with the traditional one-way active dynamic vibration absorber, the active dynamic vibration absorber has active dynamic vibration absorbing capacity in two directions and has better vibration absorbing effect.
The special structure is adopted, so that the rigidity change in two directions can be controlled only by one driving device, compared with the traditional active control system which needs an independent driving device for controlling each direction, the device can simplify the active control structure, reduce the mass and the volume of the vibration absorber and work in more limited environments.
Claims (4)
1. A two-degree-of-freedom pipeline active dynamic vibration absorber is characterized in that: the device comprises a longitudinal dynamic vibration absorption mechanism, a transverse dynamic vibration absorption mechanism and a rigidity adjusting mechanism;
the longitudinal dynamic vibration absorption mechanism comprises a mass block, a steel plate spring supporting baffle and a vibration absorber base; the mass block consists of an upper half of the mass block, a lower half of the mass block, a roller shaft and rollers arranged at the periphery of the roller shaft; a through hole is formed in the center of the mass block, and the multi-layer laminated steel plate springs penetrate through the through hole; the roller is in rolling contact with the surfaces of the stacked leaf springs, and the axial line of the roller is vertical to the central line of the through hole; the upper parts of the steel plate spring supporting baffle and the vibration absorber base are respectively provided with a first groove and a second groove which are used for installing and supporting two ends of a steel plate spring,
the transverse dynamic vibration absorption mechanism comprises the mass blocks, two groups of mass block baffles, a spiral spring, metal rubber, a variable stiffness baffle base and variable stiffness baffle top covers, wherein the two variable stiffness baffle top covers are fixedly connected with the upper part of the variable stiffness baffle base through baffle bolts and baffle nuts through fifth grooves in the lower parts of the two variable stiffness baffle top covers; the lower part of the mass block baffle is provided with a groove which is connected with a bulge on the vibration absorber base for guiding and limiting; the top covers of the two groups of variable-stiffness baffles and the upper parts of the mass block baffles are respectively provided with a third groove and a fourth groove so as to be in limit sleeve joint with two ends of the spiral spring and the metal rubber; the steel plate spring also penetrates through the variable-stiffness baffle top cover and the mass block baffle;
the rigidity adjusting mechanism comprises a rigidity changing baffle base, a rigidity changing baffle top cover, a ball screw, a speed reducer driving the ball screw to rotate and a servo motor driving the speed reducer to work, wherein the rigidity changing baffle base is in threaded connection with the ball screw through a threaded hole in the lower part; the left end of the ball screw is connected with the output end of the speed reducer, the input end of the speed reducer is connected with the output end of the servo motor, and the ball screw penetrates through a groove in the lower portion of the mass block baffle.
2. The two-degree-of-freedom pipeline active dynamic vibration absorber according to claim 1, wherein: the vibration absorber base comprises a bottom plate and a side plate arranged on one side of the bottom plate, the side plate is provided with the second groove, and the first groove arranged on the steel plate spring supporting baffle is opposite to the second groove.
3. The two-degree-of-freedom pipeline active dynamic vibration absorber according to claim 2, wherein: the lower part of the steel plate spring supporting baffle is fixedly connected with a bottom plate of the vibration absorber base through bolts; the lower part of the variable-rigidity baffle base is provided with a groove which is connected with a bulge on the vibration absorber base for limiting sliding.
4. A working method of a two-degree-of-freedom pipeline active dynamic vibration absorber is characterized by comprising the following steps: the two-degree-of-freedom pipeline active dynamic vibration absorber comprises a longitudinal dynamic vibration absorbing mechanism, a transverse dynamic vibration absorbing mechanism and a rigidity adjusting mechanism;
the longitudinal dynamic vibration absorption mechanism comprises a mass block, a steel plate spring supporting baffle and a vibration absorber base; the mass block consists of an upper half of the mass block, a lower half of the mass block, a roller shaft and rollers arranged at the periphery of the roller shaft; a through hole is formed in the center of the mass block, and the multi-layer laminated steel plate springs penetrate through the through hole; the roller is in rolling contact with the surfaces of the stacked leaf springs, and the axial line of the roller is vertical to the central line of the through hole; the upper parts of the steel plate spring supporting baffle and the vibration absorber base are respectively provided with a first groove and a second groove which are used for installing and supporting two ends of a steel plate spring,
the transverse dynamic vibration absorption mechanism comprises the mass blocks, two groups of mass block baffles, a spiral spring, metal rubber, a variable stiffness baffle base and variable stiffness baffle top covers, wherein the two variable stiffness baffle top covers are fixedly connected with the upper part of the variable stiffness baffle base through baffle bolts and baffle nuts through fifth grooves in the lower parts of the two variable stiffness baffle top covers; the lower part of the mass block baffle is provided with a groove which is connected with a bulge on the vibration absorber base for guiding and limiting; the top covers of the two groups of variable-stiffness baffles and the upper parts of the mass block baffles are respectively provided with a third groove and a fourth groove so as to be in limit sleeve joint with two ends of the spiral spring and the metal rubber; the steel plate spring also penetrates through the variable-stiffness baffle top cover and the mass block baffle;
the rigidity adjusting mechanism comprises a rigidity changing baffle base, a rigidity changing baffle top cover, a ball screw, a speed reducer driving the ball screw to rotate and a servo motor driving the speed reducer to work, wherein the rigidity changing baffle base is in threaded connection with the ball screw through a threaded hole in the lower part; the left end of the ball screw is connected with the output end of the speed reducer, the input end of the speed reducer is connected with the output end of the servo motor, and the ball screw penetrates through a groove in the lower part of the mass block baffle;
during installation, firstly, a ball screw penetrates through a threaded hole in the lower portion of the variable-rigidity baffle base, then the variable-rigidity baffle base is installed on the vibration absorber base, a groove in the lower portion of the variable-rigidity baffle base is embedded into a protrusion on the surface of the vibration absorber base, the right end of the ball screw is installed into a groove in the right side of the vibration absorber base, then the mass block baffle is installed, and the groove in the lower portion of the mass block baffle is embedded into the protrusion on the surface of the vibration absorber base; then, the laminated spring steel plate penetrates through the variable-stiffness baffle base and the mass block baffle, two ends of the laminated spring steel plate are embedded into a second groove and a first groove on the vibration absorber base, then the variable-stiffness baffle top cover is connected with the variable-stiffness baffle base through bolts and nuts, metal rubber and a spiral spring are embedded into a third groove and a groove on the variable-stiffness baffle top cover and the variable-stiffness baffle base, a cylindrical bulge of the variable-stiffness baffle top cover and a cylindrical bulge of the variable-stiffness baffle base are embedded into a hollow cylindrical bulge of the mass block baffle, the metal rubber and the spiral spring are embedded into a fourth groove of the mass block baffle, and finally the steel plate spring supporting baffle is connected with the vibration absorber base through bolts;
the principle of longitudinal dynamic vibration absorption is that when the device is excited by longitudinal load, the mass block and the laminated steel plate spring as a longitudinal dynamic vibration absorption combination can move longitudinally along with the excitation, so that the excitation energy applied to the device is transferred to the mass block;
the laminated steel plate springs have a certain damping effect in the vibration absorption process due to the friction effect between layers in the bending process;
the transverse dynamic vibration absorption principle is that when the device is excited by transverse load, the mass block can transversely move on the steel plate spring due to the fact that the rollers are arranged in the mass block, and the transverse movement of the mass block is uniformly transmitted to the spiral spring and the metal rubber through the mass block baffle, so that the mass block, the mass block baffle, the spiral spring and the metal rubber can transversely move along with the excitation as the transverse dynamic vibration absorption combination, and the excitation energy borne by the device is transferred to the mass block; the metal rubber can generate friction among the metal wires in the compression process, so that a certain damping effect is achieved in the vibration absorption process;
the active control principle is that the servo motor drives the speed reducer to drive the ball screw to rotate, and the ball screw is in threaded connection with the variable-rigidity baffle base, so that the ball screw rotates to drive the variable-rigidity baffle base and the variable-rigidity baffle top cover to generate transverse displacement; firstly, the change of the transverse positions of the variable-stiffness baffle base and the variable-stiffness baffle top cover can change the working length of the steel plate spring, so that the stiffness of longitudinal dynamic vibration absorption is changed, and the frequency of the longitudinal dynamic vibration absorption is further changed; secondly, the transverse positions of the variable-stiffness baffle base and the variable-stiffness baffle top cover are changed, the precompression quantity of the spiral spring and the metal rubber is changed, and the rigidity of the metal rubber is increased along with the increase of the compression quantity, so that the rigidity of the metal rubber can be changed by adjusting the precompression quantity, and the transverse dynamic vibration absorption frequency is further changed.
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| KR20180028722A (en) * | 2016-09-09 | 2018-03-19 | 김병찬 | Pipe supporting tool for earthquake-proof construction |
| CN208397189U (en) * | 2017-10-09 | 2019-01-18 | 广东技术师范学院 | A kind of high-precision dynamic vibration absorber |
| CN108547913B (en) * | 2018-05-14 | 2019-08-23 | 东北大学 | A kind of rotor-support-foundation system dynamic vibration absorber with varying stiffness member |
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