CN108825718B - Grounded nonlinear energy trap for inhibiting vibration of rotor system - Google Patents
Grounded nonlinear energy trap for inhibiting vibration of rotor system Download PDFInfo
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- CN108825718B CN108825718B CN201810793804.XA CN201810793804A CN108825718B CN 108825718 B CN108825718 B CN 108825718B CN 201810793804 A CN201810793804 A CN 201810793804A CN 108825718 B CN108825718 B CN 108825718B
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- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 11
- 239000006096 absorbing agent Substances 0.000 claims abstract description 80
- 230000008878 coupling Effects 0.000 claims abstract 2
- 238000010168 coupling process Methods 0.000 claims abstract 2
- 238000005859 coupling reaction Methods 0.000 claims abstract 2
- 238000013016 damping Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 1
- 230000001629 suppression Effects 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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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
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic 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
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
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- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a grounding nonlinear energy trap for inhibiting vibration of a rotor system. The nonlinear energy trap body includes a retaining ring, a coupling assembly, a absorber mass, a weak stiffness spring, and a bearing assembly. The bearing assembly is matched with the shaft and comprises a shaft sleeve, a bearing and a bearing sleeve; the weak stiffness spring is matched with the bearing assembly and the vibration absorber mass block, the connecting assembly is matched with the fixing ring and the vibration absorber mass block, and the connecting assembly comprises a segmented linear stiffness rod, wherein clearance holes with different diameters are formed in the same circumference of the vibration absorber mass block and are in clearance fit with the segmented linear stiffness rod to form segmented linear stiffness and fit nonlinear cubic stiffness; the fixed frame is fixed on the frame, and the grounding performance of the invention is embodied. The invention can effectively inhibit the vibration of the rotor system broadband, and belongs to the field of vibration noise control. The whole structure is simple and compact, the additional mass is small, the reliability is high, the use is convenient, and external energy supply is not needed.
Description
Technical Field
The invention relates to the technical field of vibration noise control, in particular to a grounding nonlinear energy trap for inhibiting vibration of a rotor system, which is used for inhibiting the vibration of the rotor system of a core component of a rotary machine.
Background
Vibration is a typical hazard of safe operation of a rotating machine, for a multi-span rotor, the working rotating speed of the multi-span rotor is usually above a first-order critical rotating speed, and the multi-span rotor must pass through the first-order critical rotating speed in the starting and stopping stages, so that strong resonance can occur at the moment, and the stable operation of a unit is seriously influenced. With the continuing efforts of the national equipment manufacturing project "2025", increasingly high demands are being made on the efficient, reliable and long-term stable operation of rotating machines. Therefore, efficient control of the vibration of the rotor system is particularly important and an urgent problem to be solved.
The installation of dynamic vibration absorbers is a common method for vibration control of rotor systems. By adding the vibration absorber, the vibration of the rotary machine can be transmitted to the vibration absorber with a small mass and maintain the low-frequency vibration. Dynamic vibration absorbers can be divided into two types: passive and active (or semi-active).
At present, the passive vibration absorber is widely used in the field of vibration suppression of rotating machinery, has a simple structure, does not need an energy source, and has great limitation in practical application due to narrow vibration suppression frequency band; the active vibration absorber has high control precision and sensitive response, and the application is low due to the excessively complex structure.
As mentioned above, both passive and active (or semi-active) vibration absorbers have corresponding disadvantages in practical applications. A new vibration suppression device must be developed to meet the requirements of simple structure and wide vibration absorption and suppression frequency band of modern rotating machinery, and the nonlinear energy trap can meet the requirements.
Disclosure of Invention
The grounding nonlinear energy trap is a lightweight device coupled with a rotor system through a key nonlinear fitting element, and the lightweight device refers to the mass of a micro vibration absorber.
The invention aims to provide a grounding type nonlinear energy trap for inhibiting the vibration of a rotor system, wherein the grounding means that a nonlinear energy trap body is fixed on a frame. The key is the utilization of the method of fitting nonlinear cubic stiffness by matching segmented linear stiffness rods with clearance holes and the application of weak stiffness springs between a bearing sleeve (rotor system) and a vibration absorber mass block.
In order to solve the technical problems, the invention adopts the implementation structural scheme that:
a grounded nonlinear energy trap for inhibiting vibration of a rotor system comprises a nonlinear energy trap body and a fixed frame;
the nonlinear energy trap body comprises a bearing assembly matched with the rotor system and a connecting assembly matched with the fixing ring and the vibration absorber mass block;
the rotor system comprises a disc and a shaft; the bearing assembly comprises a bearing, a bearing sleeve and a shaft sleeve, the shaft sleeve is sleeved on the shaft, the bearing is sleeved on the shaft sleeve, the bearing sleeve is arranged on the outer side of the bearing, and the bearing sleeve is connected with the vibration absorber mass block through a weak stiffness spring; the shaft sleeve is used for preventing the axial movement of the nonlinear energy trap body;
the connecting assembly comprises 4 connecting rods and 4 piecewise linear rigidity rods, the connecting rods are fixedly connected with the vibration absorber mass block and the fixing ring through nuts, one end of each piecewise linear rigidity rod is fixedly connected with the fixing ring through a nut, and the other end of each piecewise linear rigidity rod is in clearance fit connection with a clearance hole of the vibration absorber mass block;
the same circumference of the mass block of the vibration absorber is provided with a connecting hole and a clearance hole; the connecting holes are 4 round holes with equal diameters and are distributed in a crossed manner; the clearance holes are 4 round holes with unequal diameters in crossed distribution, and connecting rods are respectively arranged in the connection holes in the connecting component; the gap hole is internally provided with a piecewise linear rigidity rod.
The fixing frame is fixed on the rack, the other end of the fixing frame is fixedly connected with the nonlinear energy trap body, the nonlinear energy trap body is prevented from rotating along with the shaft, and two ends of the shaft are connected with the shaft end supporting seat in a matched mode.
The fixing rings are provided with through holes matched and connected with the connecting components on the same circumference.
4 mutually perpendicular positioning holes are formed in the inner wall of the vibration absorber mass block, 4 mutually perpendicular positioning holes are formed in the bearing sleeve, and 4 weak stiffness springs are positioned between the vibration absorber mass block and the bearing sleeve.
The weak stiffness spring plays a role in connecting the rotor system and the non-linear energy trap body and allows circumferential disturbance of the non-linear energy trap body.
The bearing assembly is internally provided with a bearing, so that the nonlinear energy trap body does not rotate along with the shaft when absorbing the vibration of the rotor system;
the bearing assembly comprises a shaft sleeve which has the function of preventing the vibration absorber body from axially moving along with the shaft.
When the nonlinear energy trap works, after the rotor system vibrates, the vibration force is transmitted to the vibration absorber mass block through the bearing assembly and the weak stiffness spring to drive the connecting rod to vibrate, the vibration absorber mass block is further contacted and collided with the 4 piecewise linear stiffness rods, and the vibration absorber mass block dynamically absorbs the vibration force energy of the rotor system.
The mass of the absorber mass can be changed.
4 connecting holes and 4 clearance holes of the mass block of the absorption vibrator on the same circumference are arranged in a cross way.
The invention has the beneficial effects that:
1. the bearing and the fixing ring in the whole device avoid circumferential rotation of the nonlinear energy trap body, the shaft sleeve avoids axial movement of the nonlinear energy trap body, and the working state of the device is specified.
2. Holes in the vibration absorber mass blocks in the whole set are matched and connected with the connecting assembly, the diameters of the holes and the mass of the vibration absorber mass blocks can be adjusted by replacing different vibration absorber mass blocks, so that the vibration absorber mass blocks and the piecewise linear rigidity rods are in clearance fit and can be adjusted, the nonlinear cubic rigidity fitted by the nonlinear energy trap body is further adjusted, different body parts of the nonlinear energy trap disclosed by the invention are designed, and the vibration of a rotor system under different working conditions can be absorbed.
3. The diameters of 4 connecting rods in the whole device are the same, the connecting rods are installed in parallel, the diameters of 4 piecewise linear rigidity rods are different, the connecting rods are installed in parallel and in a crossed mode, the piecewise linear rigidity rods in different groups (the fitting rules of piecewise linearity are different in strength, but all the fitting rules of piecewise linearity are changed in a cubic rule) are replaced, the piecewise linear rigidity rods and the vibration absorber mass block are in clearance fit and adjustable, and then the nonlinear cubic rigidity fitted by the nonlinear energy trap body is adjusted. Different body parts of the nonlinear energy trap are designed, so that the vibration of the rotor system under different working conditions can be absorbed.
5. The whole set of device utilizes a nonlinear energy trap mechanism to form the nonlinear energy trap of the invention, and the nonlinear energy trap is wider than a vibration suppression band of a linear vibration absorber.
Drawings
FIG. 1 is a schematic structural diagram of a grounded nonlinear energy trap for suppressing vibration of a rotor system according to the present invention applied to a specific rotor system;
FIG. 2 is a schematic structural diagram of a nonlinear energy trap body of a grounded nonlinear energy trap for suppressing vibration of a rotor system according to the present invention
FIG. 3 is a schematic diagram of a stationary ring of a grounded nonlinear energy trap for damping vibration in a rotor system in accordance with the present invention;
FIG. 4 is a schematic diagram of a grounded nonlinear energy trap with a set of diametric connection assemblies for suppressing vibration in a rotor system in accordance with the present invention;
FIG. 5 is a schematic view of a shock absorber mass with a set of diametric clearance holes of a grounded nonlinear energy trap for damping rotor system vibrations in accordance with the present invention;
FIG. 6 is a schematic view of a bearing assembly of the present invention with a bushing removed from the grounded nonlinear energy trap for damping rotor system vibrations;
FIG. 7 is a schematic view of a mounting bracket of a grounded nonlinear energy trap for suppressing vibration of a rotor system according to the present invention;
FIG. 8 is a mechanism fit graph of piecewise linear stiffness and nonlinear cubic stiffness of a grounded nonlinear energy trap for suppressing rotor system vibration in accordance with the present invention;
fig. 9 is a graph of amplitude-frequency characteristics of a rotor system without the addition of a grounded nonlinear energy trap of the present invention to suppress vibration of the rotor system.
FIG. 10(a) is a graph showing the amplitude-frequency characteristics of a rotor system and a nonlinear energy trap of the present invention, in which the fitting clearance between the clearance hole of the absorber mass block of the nonlinear energy trap of the present invention and the piecewise linear stiffness rod is 0.25 mm;
FIG. 10(b) is a graph showing the amplitude-frequency characteristics of a rotor system and a nonlinear energy trap of the present invention, in which the fitting clearance between the clearance hole of the absorber mass block of the nonlinear energy trap of the present invention and the piecewise linear stiffness rod is 0.5 mm;
fig. 10(c) is a graph of the amplitude-frequency characteristics of the rotor system and the nonlinear energy trap of the present invention, in which the fitting clearance between the clearance hole of the absorber mass block of the nonlinear energy trap of the present invention and the piecewise linear stiffness rod is 0.75 mm.
Detailed Description
The nonlinear energy trap of the present invention is described in further detail below with reference to the accompanying figures 1-9, 10(a), 10(b), and 10(c), and by way of example.
A grounding nonlinear energy trap for inhibiting the vibration of a rotor system is applied to a concrete structure of the concrete rotor system and comprises a nonlinear energy trap body, a fixing frame 2, a frame 14 and a shaft end support 15. Comprising a bearing assembly, a connecting assembly, a absorber mass 5 and a fixing ring 12. The holder 2 is shown in fig. 7. The nonlinear energy trap for suppressing the vibration of the rotor system has the piecewise linear stiffness fitting nonlinear cubic stiffness action mechanism and the action mechanism of the nonlinear energy trap mechanism, and the action mechanism is shown in figure 8. The vibration suppression effect of the rotor system under the condition that the nonlinear energy trap has 3 clearance fit conditions is shown, and the combined view is shown in fig. 9 and fig. 10.
The bearing assembly is matched with the vibration absorber mass block 5 through the weak stiffness spring 9, the connecting assembly is connected with the fixing ring 12 and the vibration absorber mass block 5, the fixing frame 2 is fixedly connected to the rack 14 through the fastening bolt 3 to achieve grounding, and the fact that the nonlinear energy trap body does not rotate along with the rotor in the working process is demonstrated. .
The length of the connecting rods 4 and the piecewise linear stiffness rods 6 intermediate the fixing ring 12 and the absorber mass 5 can be varied within a certain range by turning the nut 1. The stiffness of the vibration absorber body can be further adjusted.
The diameters of the 4 connecting rods 4 are the same, and the diameters of the 4 piecewise linear rigidity rods 6 are different and are in a stepped shaft shape.
Nonlinear energy trap body as shown in fig. 2, the connection assembly between the absorber mass 5 and the fixing ring 12 is an important part for achieving fitting nonlinear stiffness, and the connecting rod 4 is fixed together with the absorber mass 5 and the fixing ring 12 by the nut 1, respectively. The piecewise linear stiffness rod 6 and the fixing ring 12 are fixed together by the nut 1 and form clearance fit with the clearance hole of the vibration absorber mass block 5, and the piecewise linear stiffness rod 6 with high stiffness corresponds to the clearance hole with large diameter on the vibration absorber mass block 5.
The fixing frame 2 plays a role in fixing the nonlinear energy trap body to prevent the nonlinear energy trap body from rotating along with the shaft 13, and is matched with the rack 14 to show grounding performance.
The length of the connecting rod 4 and the piecewise linear rigidity rod 6 between the vibration absorber mass block 5 and the fixing ring 12 can be changed within a certain range by rotating the nut 1, so that the rigidity of the vibration absorber body can be effectively adjusted;
the diameter of the clearance hole and the mass of the vibration absorber mass block 5 can be adjusted by replacing different vibration absorber mass blocks 5, so that the fitting is formed to enable the clearance fit of the nonlinear rigidity to be adjustable, and further the rigidity of the nonlinear energy trap body can be controlled;
the 4 connecting rods 4 in the connecting component are same in diameter and are installed in parallel, the 4 piecewise linear rigidity rods 6 are different in diameter and are installed in parallel and crossed, and different groups of piecewise linear rigidity rods 6 (the piecewise linear fitting rules are different in strength and change in cubic rule) are replaced to form different clearance fit with the vibration absorber mass block 5, so that the nonlinear cubic rigidity to be synthesized is variable, and the rigidity of the nonlinear energy trap body can be further controlled.
When the nonlinear energy trap works, after the rotor system vibrates, the vibration force is transmitted to the vibration absorber mass block 5 through the bearing assembly and the weak stiffness spring 9 to drive the connecting rod 4 to vibrate, and further the vibration absorber mass block 5 is contacted and collided with the 4 segmented linear stiffness rods 6, so that the vibration absorber mass block 5 dynamically absorbs the vibration force energy of the rotor system.
When the nonlinear energy trap body works, the clearance fit forms piecewise linear rigidity and fits nonlinear cubic rigidity.
The diameter of the connecting rod 4, the diameter of the piecewise linear stiffness rod 6, the diameter of the clearance hole on the vibration absorber mass block 5 and the mass of the vibration absorber mass block 5 are calculated properly and can be changed in different ways, so that different nonlinear energy trap body parts can be designed, and the vibration of a rotor system under different working conditions can be met.
As shown in fig. 5, a plurality of circular holes are distributed on the mass block 5 of the vibration absorber, wherein 4 connecting holes are uniformly distributed, the diameters of the connecting holes are equal, and the connecting holes are used for connecting with 4 connecting rods 4, and 4 clearance holes with different diameters are uniformly distributed on the same circumference and are respectively correspondingly matched with the piecewise linear stiffness rods 6, and the larger the diameter is, the larger the stiffness of the piecewise linear stiffness rods 6 correspondingly matched is. The inner wall of the mass block 5 of the vibration absorption element is provided with 4 mutually vertical positioning holes which are used for positioning 4 weak stiffness springs 9 together with 4 mutually vertical positioning holes on the bearing sleeve 8.
The mechanism of piecewise linear stiffness fitting nonlinear cubic stiffness is illustrated in connection with fig. 8: a spring having a cubic non-linearity with a reaction force related to stiffness y-kx
3The fitting effect is very good, the effectiveness of the piecewise linear stiffness fitting nonlinear cubic stiffness is shown, and the reasonability of the design is also shown from the side.
The present embodiment aims to suppress the vibration of the rotor system, which is the core component of the rotating machine, and as can be seen from fig. 9 and 10, the vibration of the rotor system is significantly reduced as the nonlinear energy trap of the present invention is mounted on the rotor system, and the vibration suppression rate is increased as the clearance is reduced. And the vibration suppression effect is realized on frequency bands with different widths, and the self-adaptive change can be realized along with different fit gaps. The broadband vibration suppression characteristic of the nonlinear energy trap is shown, and the effect is obvious. The fault of the whole rotating mechanical equipment during operation can be reduced, and the defects of the existing vibration suppression technology are overcome.
The process of inhibiting the vibration of the rotor system by the grounding nonlinear energy trap for inhibiting the vibration of the rotor system is as follows:
when the nonlinear energy trap works, after the rotor system vibrates, the vibration force is transmitted to the vibration absorber mass block 5 through the bearing assembly and the weak stiffness spring 9 to drive the connecting rod 4 to vibrate, and further the vibration absorber mass block 5 is contacted and collided with the 4 segmented linear stiffness rods 6, so that the vibration absorber mass block 5 dynamically absorbs the vibration force energy of the rotor system.
The specific process is as follows:
when the rotor system rotates and the vibration is too small, the vibration force is transmitted to the vibration absorber mass block 5 through the bearing assembly to drive the connecting rod 4 to vibrate, the vibration amplitude of the connecting rod 4 is smaller than the relative clearance between the piecewise linear stiffness rod 6 and the gap hole of the vibration absorber mass block 5, at the moment, the piecewise linear stiffness rod 6 is not in contact with the vibration absorber mass block 5, and only the connecting rod 4 is in matched connection with the vibration absorber mass block 5. At the moment, the body of the nonlinear energy trap is equivalent to a linear dynamic vibration absorber, and the vibration suppression effect is not obvious;
when the vibration is too large, the rod with lower rigidity in the piecewise linear rigidity rods 6 is contacted and collided with the clearance hole with the small diameter of the vibration absorber mass block 5, and along with the second, the third and the fourth piecewise linear rigidity rods 6 are contacted and collided with the vibration absorber mass block 5, so that the vibration absorber mass block 5 dynamically absorbs the vibration force energy of the rotor system.
In summary, the above description is only a preferred embodiment of the rotor system dynamic vibration absorber using the nonlinear energy trap mechanism, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the patent claims of the present invention.
Claims (8)
1. A grounded nonlinear energy trap for inhibiting vibration of a rotor system is characterized by comprising a nonlinear energy trap body and a fixed frame;
the nonlinear energy trap body comprises a bearing assembly matched with the rotor system and a connecting assembly matched with a fixed ring (12) and a vibration absorber mass block (5);
the rotor system comprises a disc (7) and a shaft (13); the bearing assembly comprises a bearing (10), a bearing sleeve (8) and a shaft sleeve (11), the shaft sleeve (11) is sleeved on a shaft (13), the bearing (10) is sleeved on the shaft sleeve (11), the bearing sleeve (8) is arranged on the outer side of the bearing (10), and the bearing sleeve (8) is connected with the vibration absorber mass block (5) through a weak stiffness spring (9); the shaft sleeve (11) is used for preventing the axial movement of the nonlinear energy trap body;
the connecting assembly comprises 4 connecting rods (4) and 4 piecewise linear rigidity rods (6), the connecting rods (4) are fixedly connected with the vibration absorber mass blocks (5) and the fixing rings (12) through nuts, one ends of the piecewise linear rigidity rods (6) are fixedly connected with the fixing rings (12) through nuts, and the other ends of the piecewise linear rigidity rods are in clearance fit connection with clearance holes of the vibration absorber mass blocks (5);
connecting holes and clearance holes are formed in the same circumference of the vibration absorber mass block (5); the connecting holes are 4 round holes with equal diameters and are distributed in a crossed manner; the clearance holes are 4 round holes with unequal diameters in crossed distribution, and the connecting rods (4) are arranged in the connecting holes; a segmented linear stiffness rod (6) is accommodated in the clearance hole;
the fixing frame (2) is fixed on the rack (14), the other end of the fixing frame is fixedly connected with the nonlinear energy trap body, the nonlinear energy trap body is prevented from rotating along with the shaft (13), and two ends of the shaft (13) are connected with the shaft end supporting seat (15) in a matched mode.
2. A grounded nonlinear energy trap for damping vibration in a rotor system as in claim 1 wherein the stationary ring (12) has through holes on the same circumference for mating engagement with the coupling assembly.
3. A grounded nonlinear energy trap for damping rotor system vibrations as defined in claim 1 wherein the absorber mass (5) has 4 aligned perpendicular holes in its inner wall and the bearing housing (8) has 4 aligned perpendicular holes in it, and 4 springs of low stiffness (9) are positioned between the absorber mass (5) and the bearing housing (8).
4. The grounded nonlinear energy trap for damping vibration of a rotor system in accordance with claim 1, wherein the weak stiffness spring (9) functions to connect the rotor system and the nonlinear energy trap body, allowing for circumferential perturbation of the nonlinear energy trap body.
5. A grounded nonlinear energy trap for damping rotor system vibrations as defined in claim 1 wherein the bearing assembly contains bearings (10) therein to effect that the nonlinear energy trap body does not rotate with the shaft (13) when absorbing rotor system vibrations;
the bearing assembly comprises a sleeve (11), the function of the sleeve (11) being to prevent the vibration absorber body from moving axially with the shaft (13).
6. A grounded nonlinear energy trap to suppress vibration of a rotor system as in claim 1,
when the nonlinear energy trap works, after the rotor system vibrates, the vibration force is transmitted to the vibration absorber mass block (5) through the bearing assembly and the weak stiffness spring (9), the connecting rod (4) is driven to vibrate, the vibration absorber mass block (5) is further contacted and collided with the 4 segmented linear stiffness rods (6), and then the vibration absorber mass block (5) dynamically absorbs the vibration force energy of the rotor system.
7. A grounded nonlinear energy trap for damping rotor system vibrations as claimed in claim 1 wherein the mass of the absorber mass (5) is replaceable.
8. A grounded nonlinear energy trap for damping rotor system vibrations as defined in claim 1 wherein the absorber masses (5) are arranged with 4 connecting holes and 4 clearance holes intersecting on the same circumference.
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| CN201810793804.XA CN108825718B (en) | 2018-07-19 | 2018-07-19 | Grounded nonlinear energy trap for inhibiting vibration of rotor system |
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| CN109505922B (en) * | 2018-11-26 | 2020-06-05 | 东北大学 | Multistable nonlinear energy trap with piecewise linear beam and permanent magnet negative stiffness |
| CN110230661B (en) * | 2019-06-12 | 2021-05-28 | 东北大学 | Nonlinear energy trap with piecewise linear beam applied to rotor system |
| CN114465443B (en) * | 2022-02-16 | 2023-12-22 | 东北大学 | Permanent magnet nonlinear energy trap for suppressing torsional vibration based on magnetic repulsion principle |
| CN115027699A (en) * | 2022-06-10 | 2022-09-09 | 哈尔滨工业大学 | Nonlinear energy trap and spacecraft |
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| US4002043A (en) * | 1973-07-10 | 1977-01-11 | Toyota Jidosha Kogyo Kabushiki Kaisha | Apparatus for absorbing torque fluctuations produced by an internal combustion engine |
| US8013481B2 (en) * | 2009-03-27 | 2011-09-06 | General Electric Company | Detuner for tuning torsional mode of a rotating body |
| DE102010054303A1 (en) * | 2009-12-17 | 2011-06-22 | Schaeffler Technologies GmbH & Co. KG, 91074 | Two-mass flywheel for use in drive train of motor vehicle, has lever element tangentially rolled on inner circumference of flywheel mass by roller and pivotably mounted at flywheel mass, where lever element is designed with two-arms |
| CN103267085B (en) * | 2013-05-07 | 2015-12-23 | 北京化工大学 | Hydraulic multifrequency dynamic vibration absorber for rotary mechanical rotor |
| CN103511554B (en) * | 2013-10-17 | 2015-10-14 | 北京化工大学 | A kind of rotary machine rotor variable mass frequency modulation dynamic vibration absorber |
| CN103742591B (en) * | 2013-12-25 | 2016-01-13 | 北京化工大学 | Rotary machine rotor self adaption continuous shifting frequency tuned mass damper |
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