CN114802686A - Disc spring type integrated vibration damping thrust bearing - Google Patents
Disc spring type integrated vibration damping thrust bearing Download PDFInfo
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- CN114802686A CN114802686A CN202210460943.7A CN202210460943A CN114802686A CN 114802686 A CN114802686 A CN 114802686A CN 202210460943 A CN202210460943 A CN 202210460943A CN 114802686 A CN114802686 A CN 114802686A
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- disc spring
- thrust bearing
- thrust
- type integrated
- spring type
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- 238000013016 damping Methods 0.000 title claims abstract description 32
- 230000009467 reduction Effects 0.000 claims abstract description 33
- 210000004907 gland Anatomy 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 14
- 239000006096 absorbing agent Substances 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 19
- 239000010687 lubricating oil Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/08—Elastic or yielding bearings or bearing supports, for exclusively rotary movement primarily for axial load, e.g. for vertically-arranged shafts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
- B63H2023/325—Thrust bearings, i.e. axial bearings for propeller shafts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Support Of The Bearing (AREA)
Abstract
The invention relates to the technical field of vibration reduction of ship propulsion systems, in particular to a disc spring type integrated vibration reduction thrust bearing. The design scheme of the disc spring type integrated vibration reduction thrust bearing is provided, and can be used for longitudinal vibration reduction of a ship propulsion system, so that the longitudinal natural frequency of a shafting is reduced, and the transmission of longitudinal vibration of the shafting can be greatly reduced; the combined disc spring element is adopted as a vibration damping element, and the disc spring can realize flexible adjustment of the longitudinal rigidity of a shafting through different combination modes, so that the rigidity design requirement is met, and the combined disc spring is suitable for narrow space limitation; the disc spring type integrated vibration reduction thrust bearing adopts a variable stiffness design, and a mechanical limit structure is designed at the position of a vibration reduction disc spring in the thrust bearing, so that the shafting is prevented from excessive longitudinal displacement, and the running safety of shafting equipment is protected; the integrated design of the shafting longitudinal vibration absorber and the thrust bearing is adopted, so that the influence of additional quality and unbalance caused by the installation of the shafting longitudinal vibration absorber on the rotating shaft is avoided.
Description
Technical Field
The invention relates to the technical field of vibration reduction of ship propulsion systems, in particular to a disc spring type integrated vibration reduction thrust bearing.
Background
The sound stealth performance is one of the important performances of the naval vessel, is particularly important for special vessels such as submarines, and the low-frequency radiation noise caused by the operation vibration of the tail propulsion system makes a decisive contribution to the total level of the radiation noise of the naval vessel. The longitudinal vibration of the propulsion system is one of the important sources of low-frequency vibration noise of the stern of the ship, the vibration mainly takes low frequency as main, the strength of the vibration is closely related to the dynamic characteristics of a shafting, and the longitudinal vibration of the propulsion system and the coupling vibration of the longitudinal vibration of the propulsion system and the stern structure of a ship body, which are mainly caused by the exciting force of a propeller, need to be controlled in order to improve the sound stealth of the ship.
The traditional thrust bearing mainly comprises a thrust shaft, a thrust block, a thrust balancing mechanism, a support ring, a shell and other components, and the thrust of a propeller shaft system is transmitted to a ship body structure through the thrust shaft. Along with the thrust transfer process, the longitudinal alternating excitation force generated when the propeller runs in the uneven flow field is also transferred to the ship body structure through the shafting. Because the thrust transmission parts in the thrust bearing are in rigid contact and do not have a damping effect in the transmission process of the exciting force, the longitudinal natural frequency of the shafting is higher, and the problem of tail radiation noise is easily caused when a propulsion system runs.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the disc spring type integrated vibration reduction thrust bearing can control the longitudinal natural frequency of a propeller shaft system, attenuate the longitudinal vibration of the propeller shaft system in a target frequency band and solve the problem of vibration noise of the propeller shaft system at the tail of a ship.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a dish spring formula integration damping thrust bearing, the cover is located on boats and ships thrust shaft 1, including casing 7 and thrust disc 13, thrust disc 13 both sides are by nearly to far away in proper order the symmetry have set up two sets of thrust block group 6 and two sets of balance block group 5, thrust block group 6 and the equal circumference of balance block group 5 arrange in lantern ring 4, thrust shaft 1 overlaps with the part symmetry of 7 both sides contacts of casing and is equipped with two sets of support axle bushes 3, install on the hull base casing 7 bottom, do not follow thrust shaft 1 rotates in step.
Furthermore, end face oil seals 2 are arranged on the end faces of two sides of the shell 7, an oil inlet 11 is formed in the lower portion of the shell 7, an oil return port 12 is formed in the lower portion of the end face oil seal 2, and the oil return port 12 is connected with a lubricating oil cabin or a dirty oil cabin in the lower portion of the thrust bearing through a pipeline.
Further, the thrust block group 6 is formed by a plurality of thrust blocks which are uniformly distributed in a ring shape in the circumferential direction.
Further, the balance block group 5 is formed by a plurality of balance blocks which are circumferentially and uniformly distributed in an annular shape.
Furthermore, a combined disc spring 8 and a guide block 9 are arranged in the balance block, a boss is arranged on the upper portion of the guide block 9, one end of the boss compresses the combined disc spring 8, the other end of the boss is in close contact with a gland 10, and the gland 10 is fixed on the upper end face of the balance block.
Further, the combined disc spring 8 is formed by involution, superposition or composite combination of single disc springs, and the combination mode of the single disc springs is matched with the rigidity requirement and the design size of the thrust bearing.
Furthermore, a gap is directly formed between the lower end of the guide block 9 and the inner wall of the bottom of the balance block.
Further, the thrust block group 6 is specifically formed by 6-8 thrust blocks which are circumferentially and uniformly distributed in an annular manner.
Further, the balance block group 5 is specifically formed by 6-8 balance blocks which are circumferentially and uniformly distributed in an annular shape.
Based on the same invention concept, the embodiment of the application also provides a ship, and the ship is provided with the disc spring type integrated damping thrust bearing.
Compared with the prior art, the invention has the following main advantages:
1. the design scheme of the disc spring type integrated vibration reduction thrust bearing is provided, and can be used for longitudinal vibration reduction of a ship propulsion system, so that the longitudinal natural frequency of a shafting is reduced, and the transmission of longitudinal vibration of the shafting can be greatly reduced; taking a certain ship application object as an example, the damping effect in the frequency band is about 3-5dB after the disc spring type integrated damping thrust bearing is applied, and the damping effect at the first-order natural frequency of a shafting reaches 10-20 dB;
2. the combined disc spring element is adopted as a vibration damping element, and the disc spring can realize flexible adjustment of the longitudinal rigidity of a shafting through different combination modes, so that the rigidity design requirement is met, and the combined disc spring is suitable for narrow space limitation;
3. the disc spring type integrated vibration reduction thrust bearing adopts a variable stiffness design, and a mechanical limit structure is designed at the position of a vibration reduction disc spring in the thrust bearing, so that the shafting is prevented from excessive longitudinal displacement, and the running safety of shafting equipment is protected;
4. the integrated design of the shafting longitudinal vibration absorber and the thrust bearing is adopted, so that the influence of additional quality and unbalance caused by the installation of the shafting longitudinal vibration absorber on the rotating shaft is avoided.
Drawings
FIG. 1 is a schematic view of a disc spring type integrated vibration reduction thrust bearing structure of the present invention;
FIG. 2 is a schematic diagram of a balancing block set according to the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a longitudinal vibration transmission route diagram of a ship shafting;
FIG. 5 is a diagram showing a comparison of vibration characteristics before and after longitudinal vibration damping of a shafting.
In the figure: 1. a thrust shaft; 2. end face oil seal; 3. supporting the bearing bush; 4. a collar; 5. a balancing block group; 6. a thrust block set; 7. a housing; 8. a combined disc spring; 9. a guide block; 10. a gland; 11. an oil inlet; 12. an oil return port; 13. a thrust disk.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
One, disc spring type integrated vibration reduction thrust bearing structure
As shown in fig. 1, the disc spring type integrated vibration damping thrust bearing provided by this embodiment is formed by combining a thrust shaft 1, an end face oil seal 2, a support bearing bush 3, a lantern ring 4, a balance block group 5, a thrust block group 6, a housing 7, a combined disc spring 8, a guide block 9, a gland 10 and an oil inlet 11.
Specifically, the thrust shaft 1 is supported by two sets of supporting bearing bushes 3, bears the weight load of the shaft system at the position, two sets of thrust block groups 6 are arranged on two sides of a thrust disc 13 of the thrust shaft 1, each set of thrust block group 6 is formed by circumferentially and uniformly distributing 6-8 thrust blocks, and bears the forward and reverse thrust of the shaft system respectively, so that the transmission of the thrust of the shaft system from the rotating thrust shaft 1 to the static thrust block group 6 is realized.
Further, the thrust block groups 6 are circumferentially arranged in the lantern ring 4, the balance block groups 5 are arranged in the middle to realize the thrust balance of 6-8 thrust blocks in each group, and the specific pressure of individual thrust blocks caused by installation errors is prevented from being too large. The thrust block group 6, the balance block group 5 and the lantern ring 4 realize the transmission of shafting thrust from the thrust block group to the shell 7, and further realize the transmission to the hull base through the shell and the base mounting surface.
As shown in fig. 2 to 3, the combined disc spring 8 is installed in the balance block set 5, and a group of combined disc springs is arranged in each balance block, and the disc springs can be formed by involution, superposition or composite combination of single disc springs, so as to meet the requirements of different bearing environments and vibration reduction environments. The combined disc spring 8 is tightly pressed by the guide block 9, and pretightening force is applied through the gland 10 to ensure that the combined disc spring 8 has enough fatigue life. A certain gap is reserved between the guide block 9 and the lower part of the balance block group, the gap is the working stroke of the combined disc spring 8, after the combined disc spring 8 exceeds the working stroke, the guide block 9 is in direct contact with the lower part of the balance block group, the vibration reduction function of the bearing is lost, and the shafting equipment is protected from being used safely.
Furthermore, the end face oil seals 2 are arranged at two ends of the shell 7 and used for ensuring the sealing between the shell 7 and the thrust bearing 1, and a shafting lubricating oil system conveys lubricating oil to the thrust bearing through the oil inlet 11 and returns to the lubricating oil system through an oil return port at the upper part of the shell. The lower part of the end face oil seal 2 is provided with an oil return port 12 which is connected with a lubricating oil cabin or a dirty oil cabin at the lower part of the bearing through a pipeline, so that a small amount of leaked lubricating oil leaked from the oil seal can be ensured to flow back to the oil cabin.
Second, the working principle
1) The thrust bearing integrates a vibration damping element, and the longitudinal vibration damping of a shafting is realized through the bearing rigidity adjustment
As shown in fig. 4, the thrust bearing internal thrust transmission channel is also a vibration transmission channel, and the damping design of the thrust bearing aims at the characteristic of the force transmission channel, and damping elements are integrally arranged in series in the bearing internal force transmission channel. According to a longitudinal vibration model of a shafting, the rigidity of the vibration reduction element is far lower than the contact rigidity of other structural parts, and the rigidity of the vibration reduction structure is a determining factor of the vibration characteristic of the single-degree-of-freedom system.
The existing linear vibration isolation theory shows that when the natural frequency of the system is lower than the excitation frequency by 1/the excitation frequency, the system can play a vibration isolation effect. The longitudinal vibration control of the shafting is mainly performed in a low-frequency range, and theoretically, the lower the rigidity of the vibration damping element is, the lower the longitudinal first-stage natural frequency is, and the lower the longitudinal first-stage natural frequency is, so that the longitudinal vibration damping of the system is more beneficial.
Before and after the shafting is applied to the longitudinal vibration reduction thrust bearing, the force transmission characteristic pair is shown in figure 5, and the system force transmission characteristic can be changed according to the rigidity adjustment of the vibration reduction element, so that the reduction of the vibration response in the target frequency band is realized.
2) Adopts a combined disc spring element as a damping element to adapt to the restriction of narrow space
The thrust bearing has the advantages that the arrangement of the internal structure is compact, the longitudinal sizes of the thrust block, the upper balance block, the lower balance block and the lantern ring structure are small, the size is small, and meanwhile, the vibration reduction element with the bearing and vibration reduction functions is provided.
The disc spring has the characteristics of compact structure, high rigidity and the like, has better comprehensive performance, and is particularly suitable for the use environment with narrow space and high rigidity requirement inside the thrust bearing. Meanwhile, the disk spring can realize flexible adjustment of the longitudinal rigidity of the shafting through different combination modes, and the rigidity design requirement is met.
Therefore, the thrust bearing adopts the combined disc spring as a damping element, and meets the working requirements of damping, bearing, narrow space and the like of the thrust bearing.
3) The variable rigidity design ensures the safety of shafting equipment
The disc spring type integrated vibration reduction thrust bearing adopts a variable stiffness design, a mechanical limit structure is designed at the position of a vibration reduction disc spring in the thrust bearing, and the thrust of a shaft system is transmitted by the vibration reduction disc spring under low thrust and the vibration reduction function is realized; after the compression amount of the disc spring reaches the limit stroke during high thrust, the bearing is in rigid contact with the inside of the bearing, the damping function is not provided any more, the shafting is prevented from being excessively longitudinally displaced, and the shafting equipment is protected from running safely.
4) Integration and miniaturization of thrust bearing and shock absorber
The disc spring type integrated vibration reduction thrust bearing realizes the function integration of the shafting thrust bearing and the shafting longitudinal vibration reducer, and the vibration reduction element is integrated in a non-rotating part in the thrust bearing, so that the disc spring type integrated vibration reduction thrust bearing has the function of bearing the shafting thrust load and can also realize the shafting longitudinal vibration reduction. The integrated thrust bearing has the advantages that the overall size is equivalent to that of the traditional thrust bearing, the weight is slightly larger than that of the traditional thrust bearing, the integrated and miniaturized design of the thrust bearing and the shock absorber is realized, and meanwhile, the negative effects of additional mass, unbalance and the like caused by the fact that the independent shock absorber is installed on a rotating shaft are avoided.
Based on the same invention concept, the embodiment of the application also provides a ship, and the ship is provided with the disc spring type integrated damping thrust bearing.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a dish spring formula integration damping thrust bearing, the cover is located on boats and ships thrust shaft (1), including casing (7) and thrust disc (13), its characterized in that, thrust disc (13) both sides are by nearly to far away in proper order the symmetry have set up two sets of thrust block group (6) and two sets of balance block group (5), thrust block group (6) and balance block group (5) equal circumference arrange in lantern ring (4), thrust shaft (1) is equipped with two sets of support axle bush (3) with the partial symmetry cover of casing (7) both sides contact, install on the hull base casing (7) bottom, not along with thrust shaft (1) synchronous rotation.
2. The disc spring type integrated vibration reduction thrust bearing according to claim 1, wherein end face oil seals (2) are arranged on two side end faces of the shell (7), an oil inlet (11) is arranged on the lower portion of the shell (7), an oil return opening (12) is arranged on the lower portion of the end face oil seal (2), and the oil return opening (12) is connected with an oil sliding cabin or an oil sump cabin on the lower portion of the thrust bearing through a pipeline.
3. Disc spring type integrated vibration damping thrust bearing according to claim 1, characterized in that the thrust block group (6) is formed by a plurality of thrust blocks which are uniformly distributed in a ring shape in the circumferential direction.
4. The disc spring type integrated vibration damping thrust bearing according to claim 1, wherein the balancing block group (5) is formed by a plurality of balancing blocks which are uniformly distributed in a circumferential direction in an annular shape.
5. The disc spring type integrated vibration damping thrust bearing according to claim 4, wherein a combined disc spring (8) and a guide block (9) are arranged in the balance block, a boss is arranged at the upper part of the guide block (9), one end of the boss compresses the combined disc spring (8), the other end of the boss is tightly contacted with a gland (10), and the gland (10) is fixed on the upper end surface of the balance block.
6. The disc spring type integrated vibration damping thrust bearing according to claim 5, wherein the combined disc spring (8) is formed by involution, superposition or composite combination of single disc springs, and the combination mode of the single disc springs is matched with the rigidity requirement and the design size of the thrust bearing.
7. Disc spring type integrated damping thrust bearing according to claim 5, characterized in that the lower end of the guide block (9) is directly provided with a gap with the inner wall of the balance block bottom.
8. The disc spring type integrated vibration damping thrust bearing according to claim 3, wherein the thrust block group (6) is formed by uniformly distributing 6-8 thrust blocks in an annular shape in the circumferential direction.
9. The disc spring type integrated vibration damping thrust bearing according to claim 4, wherein the balance block group (5) is formed by uniformly distributing 6-8 balance blocks in a ring shape in the circumferential direction.
10. A ship, characterized in that the ship is provided with a disc spring type integrated damping thrust bearing according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210460943.7A CN114802686A (en) | 2022-04-28 | 2022-04-28 | Disc spring type integrated vibration damping thrust bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210460943.7A CN114802686A (en) | 2022-04-28 | 2022-04-28 | Disc spring type integrated vibration damping thrust bearing |
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| Publication Number | Publication Date |
|---|---|
| CN114802686A true CN114802686A (en) | 2022-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210460943.7A Pending CN114802686A (en) | 2022-04-28 | 2022-04-28 | Disc spring type integrated vibration damping thrust bearing |
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| Country | Link |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB880889A (en) * | 1959-07-30 | 1961-10-25 | Erwin Metzmeier | Improvements in force measuring apparatus |
| US20060180424A1 (en) * | 2005-02-16 | 2006-08-17 | Koji Sato | Rotation transmission device |
| CN102927137A (en) * | 2012-11-06 | 2013-02-13 | 中国舰船研究设计中心 | Disc spring type vibration attenuation thrust bearing |
| CN204985330U (en) * | 2015-07-29 | 2016-01-20 | 中国舰船研究设计中心 | Mechanical type damping thrust bearing |
| CN108561503A (en) * | 2018-04-12 | 2018-09-21 | 上海交通大学 | The unit of dynamic absorber containing Negative stiffness spring and thrust bearing |
| CN111442051A (en) * | 2020-04-24 | 2020-07-24 | 中国舰船研究设计中心 | Active thrust balance type shafting longitudinal vibration damper |
| CN113335488A (en) * | 2021-06-25 | 2021-09-03 | 中国舰船研究设计中心 | Two-stage longitudinal vibration isolation shafting |
-
2022
- 2022-04-28 CN CN202210460943.7A patent/CN114802686A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB880889A (en) * | 1959-07-30 | 1961-10-25 | Erwin Metzmeier | Improvements in force measuring apparatus |
| US20060180424A1 (en) * | 2005-02-16 | 2006-08-17 | Koji Sato | Rotation transmission device |
| CN102927137A (en) * | 2012-11-06 | 2013-02-13 | 中国舰船研究设计中心 | Disc spring type vibration attenuation thrust bearing |
| CN204985330U (en) * | 2015-07-29 | 2016-01-20 | 中国舰船研究设计中心 | Mechanical type damping thrust bearing |
| CN108561503A (en) * | 2018-04-12 | 2018-09-21 | 上海交通大学 | The unit of dynamic absorber containing Negative stiffness spring and thrust bearing |
| CN111442051A (en) * | 2020-04-24 | 2020-07-24 | 中国舰船研究设计中心 | Active thrust balance type shafting longitudinal vibration damper |
| CN113335488A (en) * | 2021-06-25 | 2021-09-03 | 中国舰船研究设计中心 | Two-stage longitudinal vibration isolation shafting |
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