CN203463532U - Three-direction frequency adjustable dynamic absorber - Google Patents
Three-direction frequency adjustable dynamic absorber Download PDFInfo
- Publication number
- CN203463532U CN203463532U CN201320449791.7U CN201320449791U CN203463532U CN 203463532 U CN203463532 U CN 203463532U CN 201320449791 U CN201320449791 U CN 201320449791U CN 203463532 U CN203463532 U CN 203463532U
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- guide rod
- nut
- fixed mass
- end fixed
- mass piece
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Abstract
The utility model provides a three-direction frequency adjustable dynamic absorber which comprises a guide rod, a middle nut, an upper-end nut, a lower-end spring, an upper-end spring, a lower-end fixed mass block, an upper-end fixed mass block and a plurality of frequency adjustable mass blocks. A connecting relation among the parts is that the lower-end fixed mass block, the frequency adjustable mass blocks and the upper-end fixed mass block are sequentially sleeved on the guide rod, the middle nut is matched with the lower-end spring, the upper-end nut is matched with the upper-end spring, and the lower-end fixed mass block, the plurality of frequency adjustable mass blocks and the upper-end fixed mass block are fixed on the guide rod through pre-tightening force. By means of the three-direction frequency adjustable dynamic absorber, by assembling the guide rod, the upper-end fixed mass block and the lower-end fixed mass block together, the guide rod has uniform vibration absorption frequency in any radial direction of the guide rod, and the three-direction frequency adjustable dynamic absorber has three-direction uniform vibration absorbing performance.
Description
Technical field
The utility model belongs to Control Technique of Vibration and Noise field, is specifically related to a kind of three-dimensional frequency-adjustable dynamic vibration absorber.
Background technique
During Ship Equipments (as various blower fan, water pump, oil pump etc.) running, the inertial force producing due to bias can produce vibration at equipment under-chassis.Three orthogonal components of under-chassis vibration, even may be basically identical often in same magnitude, but equipment is being carried out before experimental test, is difficult to determine the main direction of under-chassis vibration.Therefore, objectively need a kind of bump leveller that can suppress three direction vibrations.At present, domestic bump leveller only has the function of one or two direction absorbing, cannot meet the demand of three-dimensional absorbing.
Meanwhile, because most equipment on naval vessels is all with some or several fixed frequency runnings, vibrational energy concentrates on line spectrum peak value, therefore needs dynamic vibration absorber to have frequency modulation function, can significantly reduce and even eliminate line spectrum peak value, thus the Stealth Fighter of raising naval vessels.
Model utility content
In view of this, the purpose of this utility model is to provide a kind of three-dimensional frequency-adjustable dynamic vibration absorber, and it can suppress three directions of Ship Equipments and vibrate, effectively suppresses Ship Equipments line spectrum peak value.
Realize the technical solution of the utility model as follows:
A three-dimensional frequency-adjustable dynamic vibration absorber, comprises guide rod, intermediate nut, upper end nut, lower end spring, upper end spring, lower end fixed mass piece, upper end fixed mass piece and plural frequency modulation gauge block;
Annexation between above-mentioned part is: on guide rod, be set with successively lower end fixed mass piece, frequency modulation gauge block and upper end fixed mass piece, intermediate nut coordinates lower end spring and upper end nut to coordinate upper end spring that lower end fixed mass piece, a plurality of frequency modulation gauge block and upper end fixed mass piece are fixed on guide rod by pretightening force.
Further, lower end described in the utility model fixed mass piece is provided with groove, and described lower end spring section is positioned at this groove; Described upper end fixed mass piece is provided with groove, and described upper end spring section is positioned at this groove.
Further, the utility model comprises four positioning rings, and the outer peripheral surface of described positioning ring is conical surface; Four positioning rings are respectively between lower end spring and intermediate nut, between lower end spring and lower end fixed mass piece, between upper end spring and upper end nut and respectively establish one between upper end spring and upper end fixed mass piece.
Further, on the utility model guide rod, non-threaded part surface is coated with chromium.
Beneficial effect
The first, the utility model three-dimensional frequency-adjustable dynamic vibration absorber is by being assembled together guide rod and upper and lower end fixed mass piece, make along guide rod radially any direction all there is consistent absorbing frequency, guarantee the utlity model has good absorbing performance.
The second, the utility model, by adjusting the position of intermediate nut and upper end nut, is fixed on upper and lower end fixed mass piece the diverse location of guide rod, makes the utility model radially have frequency modulation function at guide rod; The utility model is by adjusting the quantity of frequency modulation gauge block, make the utility model at guide rod shaft to thering is frequency modulation function.Axially and radially frequency modulation function has formed the accurately characteristic of frequency modulation absorbing of the utility model three-dimensional, can effectively suppress Ship Equipments line spectrum peak value.
Three, the utility model is arranged on each part on guide rod, and its compact structure, installing space demand are little; Adopt double nut locking mode not only mounting type is simple, easy accessibility simultaneously, and has locking functions, and reliability is high.
Accompanying drawing explanation
The main sectional view of a kind of three-dimensional frequency-adjustable of Fig. 1 the utility model dynamic vibration absorber.
Fig. 2 frequency modulation mass number of blocks and three-dimensional frequency-adjustable dynamic vibration absorber axial natural frequency are related to schematic diagram.
Fig. 3 mass block position and three-dimensional frequency-adjustable dynamic vibration absorber radially natural frequency are related to schematic diagram;
Wherein, 1-guide rod, 2-pad, end nut under 3-, 4-intermediate nut, 5-positioning ring, 6-lower end spring, 7-lower end fixed mass piece, 8-frequency modulation gauge block, 9-upper end fixed mass piece, 10-upper end spring, the upper end nut of 11-.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment 1, as shown in Figure 1, the utility model three-dimensional frequency-adjustable dynamic vibration absorber, mainly comprises guide rod, intermediate nut 4, upper end nut 11, lower end spring 6, upper end spring 10, lower end fixed mass piece 7, upper end fixed mass piece 9 and plural frequency modulation gauge block 8.
Annexation between above-mentioned part is: on guide rod 1, be set with successively lower end fixed mass piece 7, frequency modulation gauge block 8 and upper end fixed mass piece 9, intermediate nut 4 coordinates lower end spring 6 and upper end nut 11 to coordinate upper end spring 10 that lower end fixed mass piece 7, a plurality of frequency modulation gauge block 8 and upper end fixed mass piece 9 are fixed on guide rod 1 by pretightening force.
The utility model three-dimensional frequency-adjustable dynamic vibration absorber frequency modulation principle is as follows:
Axial frequency modulation principle: according to axial frequency equation
(k is spring rate, and m is mass block quality) known, when spring is constant, k is constant; During the increase and decrease of frequency modulation gauge block number, quality m changes, thereby changes frequency.When single frequency modulation gauge block is very thin, can makes quality m regulate with very little step-length, and then realize axially accurate frequency modulation.
Frequency modulation principle radially: according to radially simplifying frequency equation
(E is elasticity modulus of materials, and I is guide rod cross sectional moment of inertia, and m is mass block quality, and L is the distance of mass block centroid distance guide rod fixed end) known, when material is selected, parameter E is constant; When guide rod is constant, parameter I is constant; When completing axial frequency modulation, frequency modulation gauge block number is selected, and quality m is constant; Because nut can be fixed on the arbitrary position of screw thread, the distance L of mass block and guide rod fixed end is adjustable, thereby changes frequency.Because the pitch of screw thread is very little, the step-length that parameter L can be very little regulates, and then realizes radially accurate frequency modulation.
In order to reduce the setting height(from bottom) of spring, make the utility model compact structure, reduce the demand to equipment under-chassis installing space; On lower end fixed mass piece 7, be provided with groove, the part of described lower end spring 6 is positioned at this groove, described upper end fixed mass piece 9 is provided with groove, and the part of described upper end spring 10 is positioned at this groove, can well reduce the demand to equipment under-chassis installing space like this.
The utility model spring directly contacts with nut, if the internal diameter of spring is greater than guide rod diameter, spring, in the process being squeezed, deflection may occur, and in like manner when spring directly contacts with fixed mass piece, also has same problem; Therefore the utility model further comprises four positioning rings 4, and the outer peripheral surface of described positioning ring 4 is conical surface; Four positioning rings 4 are respectively between lower end spring 6 and intermediate nut 4, between lower end spring 6 and lower end fixed mass piece 7, between upper end spring 10 and upper end nut 11 and respectively establish one between upper end spring 10 and upper end fixed mass piece 9; Like this when using the spring of different inner diameters, can keep-spring axis and guide rod axis centering.
The utility model guide rod 1 is cylindrical-shaped structure, guaranteed like this along guide rod radially any direction all there is consistent rigidity; There is flat mouth on guide rod top simultaneously, is convenient to installation and removal.
The utility model bump leveller also further comprises lower end nut 3 and pad 2, and lower end nut 3 and pad 2 are socketed on respectively guide rod 1 bottom, for described guide rod 1 being fixed on to the under-chassis of required dampening apparatus.The present embodiment is provided with three sections of screw threads on guide rod 1, lower thread is for fixing lower end nut 3 and pad 2, middle part screw thread is used for fixedly intermediate nut 4, top screw thread is for fixing upper end nut 11, wherein the diameter in the non-threaded part between bottom and middle part screw thread is slightly less than minor diameter of thread, is convenient to like this intermediate nut and is screwed into.The present embodiment intermediate nut, upper end nut and lower end nut are all the double nut locking mechanism that two nuts form, and on three sections of screw threads, all adopt double nut means of fixation, can the easy disassembly again of locking merit.
The utility model upper end fixed mass piece 9 and lower end fixed mass piece 7 are cylindrical-shaped structure, and there is through hole at center, can guarantee along guide rod 1 radially any direction there is consistent mass distribution.
The utility model frequency modulation gauge block 8 is cylinder sheet structure, and there is through hole at center, during use, multi-disc frequency modulation gauge block 8 is stacked, and the quantity of thin slice can increase and decrease according to the actual requirements.
Concrete installation step is as follows:
A. intermediate nut is screwed into the screw thread of guide rod middle part from guide rod bottom;
B. the frequency modulation gauge block of positioning ring, lower end spring, positioning ring, lower end fixed mass piece, selected quantity is assemblied in guide rod from guide rod top successively;
C. again upper end fixed mass piece, positioning ring, upper end spring, positioning ring are assemblied in guide rod from guide rod top successively;
D. upper end nut is screwed into the screw thread of guide rod top from guide rod top;
E. adjust mass block to desired location, and tighten intermediate nut and upper end nut;
F. lower end nut and pad are screwed into guide rod lower thread from guide rod bottom successively;
G. by designed depth, guide rod is screwed into equipment under-chassis, tightens lower end of the guide rod nut.
Using method is as follows:
First, according to the absorbing frequency of the rigidity of spring and design, calculate frequency modulation mass number of blocks and three-dimensional frequency-adjustable dynamic vibration absorber axial natural frequency relation, obtain the axial frequency modulation rule figure of three-dimensional frequency-adjustable dynamic vibration absorber, as shown in Figure 2;
Secondly, respectively mass block is arranged in to the diverse location of guide rod, calculated mass piece position and three-dimensional frequency-adjustable dynamic vibration absorber be natural frequency relation radially, obtains the radially frequency modulation rule figure of three-dimensional frequency-adjustable dynamic vibration absorber, as shown in Figure 3.
Then, the position on guide rod according to the quality and quantity piece of axially determining frequency modulation gauge block with radially frequency modulation rule, target absorbing frequency of three-dimensional frequency-adjustable dynamic vibration absorber.
Finally, three-dimensional frequency-adjustable dynamic vibration absorber is assemblied on under-chassis, actual measurement three-dimensional frequency-adjustable dynamic vibration absorber three-dimensional natural frequency, if there is certain error, the position of the quality and quantity piece that can further finely tune frequency modulation gauge block on guide rod, realizes accurate frequency modulation.
The test that 4 three-dimensional frequency-adjustable dynamic vibration absorbers are installed by the auxiliary condensate pump under-chassis at real ship shows: before and after the utility model is installed, the strong line spectrum peak value minimum of three-way vibration of the under-chassis of equipment, pedestal, the mouth of pipe is 7dB, maximum reaches 20dB, and shock attenuation result is remarkable.
Embodiment 2, on embodiment 1 basis, by non-threaded part surface chromium plating on guide rod 1, improve surface hardness and degree of finish, thereby reduce the frictional force of mass block and guide rod 1 and reduce the wearing and tearing of guide rod 1; The all parts of the utility model are selected to anticorrosive stainless steel material, can high-low temperature resistant, greasy dirt, irradiation, corrosion, thus improve environmental suitability.
Embodiment 3, nut check mode can be changed into slotted nut and coordinate cotter pin, thereby when realizing locking functions, can reduce again the height of former nut on the basis of embodiment 1 or 2, and guide rod 1 is shortened, and reduced installing space demand of the present utility model.
Claims (9)
1. a three-dimensional frequency-adjustable dynamic vibration absorber, it is characterized in that, comprise guide rod (1), intermediate nut (4), upper end nut (11), lower end spring (6), upper end spring (10), lower end fixed mass piece (7), upper end fixed mass piece (9) and plural frequency modulation gauge block (8);
Annexation between above-mentioned part is: on guide rod (1), be set with successively lower end fixed mass piece (7), frequency modulation gauge block (8) and upper end fixed mass piece (9), intermediate nut (4) coordinates lower end spring (6) and upper end nut (11) to coordinate upper end spring (10) that lower end fixed mass piece (7), a plurality of frequency modulation gauge block (8) and upper end fixed mass piece (9) are fixed on guide rod (1) by pretightening force.
2. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 1, is characterized in that, described lower end fixed mass piece (7) is provided with groove, and described lower end spring (6) part is positioned at this groove; Described upper end fixed mass piece (9) is provided with groove, and described upper end spring (10) part is positioned at this groove.
3. according to three-dimensional frequency-adjustable dynamic vibration absorber described in claim 1 or 2, it is characterized in that, described bump leveller also comprises four positioning rings (4), and the outer peripheral surface of described positioning ring (4) is conical surface; Four positioning rings (4) are respectively between lower end spring (6) and intermediate nut (4), between lower end spring (6) and lower end fixed mass piece (7), between upper end spring (10) and upper end nut (11) and respectively establish one between upper end spring (10) and upper end fixed mass piece (9).
4. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 3, is characterized in that, described guide rod (1) is cylindrical-shaped structure.
5. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 4, is characterized in that, described upper end fixed mass piece (9) is cylindrical-shaped structure with lower end fixed mass piece (7).
6. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 4, it is characterized in that, described bump leveller also comprises lower end nut (3) and pad (2), lower end nut (3) and pad (2) are socketed on respectively guide rod (1) bottom, for described guide rod (1) being fixed on to the under-chassis of required dampening apparatus.
7. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 1, is characterized in that, described intermediate nut (4) is connected with guide rod (1) by the screw thread on guide rod (1) with upper end nut (11).
8. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 1, is characterized in that, described intermediate nut (4) and upper end nut (11) are slotted nut, and it is fixedly connected with guide rod (1) by cotter pin.
9. three-dimensional frequency-adjustable dynamic vibration absorber according to claim 1, is characterized in that, the upper non-threaded part surface of described guide rod (1) is coated with chromium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320449791.7U CN203463532U (en) | 2013-07-26 | 2013-07-26 | Three-direction frequency adjustable dynamic absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320449791.7U CN203463532U (en) | 2013-07-26 | 2013-07-26 | Three-direction frequency adjustable dynamic absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203463532U true CN203463532U (en) | 2014-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320449791.7U Withdrawn - After Issue CN203463532U (en) | 2013-07-26 | 2013-07-26 | Three-direction frequency adjustable dynamic absorber |
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| Country | Link |
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| CN (1) | CN203463532U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542031A (en) * | 2013-07-26 | 2014-01-29 | 中国船舶重工集团公司第七一九研究所 | Three-way frequency-adjustable dynamic vibration absorber |
-
2013
- 2013-07-26 CN CN201320449791.7U patent/CN203463532U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542031A (en) * | 2013-07-26 | 2014-01-29 | 中国船舶重工集团公司第七一九研究所 | Three-way frequency-adjustable dynamic vibration absorber |
| CN103542031B (en) * | 2013-07-26 | 2015-08-19 | 中国船舶重工集团公司第七一九研究所 | A kind of three-dimensional frequency-adjustable dynamic vibration absorber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140305 Effective date of abandoning: 20150819 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140305 Effective date of abandoning: 20150819 |
|
| RGAV | Abandon patent right to avoid regrant |