CN207336067U - A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device - Google Patents
A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device Download PDFInfo
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- CN207336067U CN207336067U CN201721155643.9U CN201721155643U CN207336067U CN 207336067 U CN207336067 U CN 207336067U CN 201721155643 U CN201721155643 U CN 201721155643U CN 207336067 U CN207336067 U CN 207336067U
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- loading
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- down support
- rotary axis
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Abstract
The utility model provides a kind of rotary axis longitudinal loading loading device with low dynamic stiffness characteristic, including servo rotary module, loading disc, main spring, secondary spring, loading screw rod, electromagnetic attraction module, exciting rod, electromagnetic exciter and hold-down support；One end of loading screw rod is fixed on the front panel of hold-down support, the other end passes through loading disc, main spring is sleeved on the loading screw rod between hold-down support and loading disc, and secondary spring is sleeved on the end of loading screw rod, is coordinated with bolt and is compressed loading screw rod with loading disc；Servo rotary module is installed on the front end of loading disc, for being connected with rotary axis；Electromagnetic attraction module is installed on hold-down support front panel, and electromagnetic exciter rigidly fixes or flexible suspension is on hold-down support, and exciting rod is fixed through the perforate of hold-down support front panel, electromagnetic attraction module interstitial hole and the center of loading disc rear end face.The present apparatus can impact rotary axis longitudinal direction inherent characteristic to avoid longitudinal loading device.
Description
Technical field
The utility model belongs to rotary axis vibrating noise abatement and experimental test technical field, and more particularly to one kind is used for
The low dynamic stiffness of rotary axis longitudinally loads exciting device.
Background technology
Marine propulsion shafting is the key components of marine propuision system, generally by main shaft, radial support bearing, thrust
The components such as bearing, shaft coupling form, and carry power-equipment moment of torsion is passed to propeller while produces propeller rotation
Thrust passes to the vital task of hull.Propulsion Systems vibration can not only cause noise, also can shaft and associated components can
Influence is brought by property.Therefore, the intensity of Propulsion Systems and vibration problem are the important content of Ship Design all the time, are received
Engineering and the attention of scientific research personnel, have obtained extensive research.
In the research process of Propulsion Systems vibration noise, shore-front-trials bench simulation and test are to solve reproduction shafting to shake
Moving noise phenomenon, seek shafting vibration rule and examine the important means of control measure effect.Propulsion Systems shore-front-trials rack
, it is necessary to simulate longitudinal loading and incentive action that propeller rotation produces in experiment.Propeller rotation can produce longitudinal static state
Thrust load and dynamic excitation power.For marine propulsion shafting, the longitudinal thrust load that it bears is usually larger, Neng Gouda
To several tons to more than tens tons.Therefore, when carrying out longitudinal static thrust loading, adding for larger Static stiffness is inevitably used
Mounted mechanism is to meet larger static thrust needs.
When load maintainer longitudinal direction static rigidity is larger, its longitudinal dynamic rate is generally also bigger.This be equivalent to
Whole rotary axis introduces an additional stiffness, can directly change longitudinal inherent characteristic of whole Propulsion Systems, cause to test
There is deviation in obtained rotary axis longitudinal mode and vibration noise rule, influences result of the test and verification the verifying results.Therefore, in reality
While the loading of big load longitudinal direction is now carried out to rotary axis, it is larger to rotation that load maintainer device dynamic stiffness is reduced or eliminated as far as possible
The problem of influence of shaft system longitudinal direction inherent characteristic is in the urgent need to address in the rotation land bench test of Propulsion Systems.
Utility model content
The purpose of this utility model is to provide a kind of rotary axis longitudinal loading with low dynamic stiffness characteristic to load dress
Put, which can be in the case where providing larger longitudinal static thrust, using " positive rigid spring " and " negative stiffness electromagnetic spring "
The control device being combined, it is inherently special that rotary axis longitudinal direction loading device itself dynamic stiffness shaft is reduced or eliminated as far as possible in realization
Property influence purpose.
The technical scheme for implementing the utility model is as follows：
A kind of rotary axis longitudinal loading loading device with low dynamic stiffness characteristic, including servo rotary module, loading
Disk, loading spring, loading screw rod, electromagnetic attraction module, exciting rod, electromagnetic exciter and hold-down support, wherein, the loading bullet
Spring is made of main spring and secondary spring；
One end of the loading screw rod is fixed on the front panel of hold-down support, and the other end passes through loading disc, the main bullet
Spring is sleeved on the loading screw rod between hold-down support and loading disc, and the secondary spring is sleeved on the end of loading screw rod, with
Bolt, which coordinates, compresses loading screw rod with loading disc；The servo rotary module is installed on the front end of loading disc, for rotation
Coupling of shaft system；The electromagnetic attraction module is installed on hold-down support front panel, and electromagnetic exciter rigidly fixes or flexible suspension
On hold-down support, exciting rod passes through the perforate of hold-down support front panel, electromagnetic attraction module interstitial hole and loading disc rear end face
Center is fixed.
Further, servo rotary module described in the utility model is by thrust bearing, rotating ring, friction top and locking screw
Mother's composition；Thrust bearing inner ring sleeve is mounted in the front end of loading disc, and is locked with locking nut；Thrust bearing outer shroud is pacified
Held out against mounted in the inside of rotating ring, and with friction top；The rotating ring is connected with rotary axis terminal stud；When Propulsion Systems operate
When, rotating ring, friction top, outer shroud rotate together.
Further, the diameter at loading screw rod rear portion described in the utility model is more than front portion, is threaded, leads on rear portion
Cross screw thread and coordinate fixation with the threaded hole on hold-down support front panel.
Further, the utility model rotating ring is connected using connection bolt with rotary axis end thread hole, thread rotary orientation
It is opposite with shafting rotation direction.
Beneficial effect
1) this loading device uses the electromagnetic attraction module with equivalent negative stiffness characteristics in parallel with spring, realizes low dynamic firm
The loading of degree longitudinal direction, can reduce the dynamic stiffness of longitudinal loading device, avoid longitudinal loading device intrinsic to rotary axis longitudinal direction special
Property impacts.
2) longitudinal static load that this loading device provides can be adjusted as needed.By selecting different model
Loading spring, thus it is possible to vary longitudinal thrust magnitude of load, adapts to different type rotary axis, different contractings than ratio test-bed
Loading needs.
3) the negative stiffness size of electromagnetic attraction module can be easily adjusted in this loading device, given by designing
The excitation current size of electromagnetic attraction module, thus it is possible to vary the negative stiffness of electromagnetic attraction module, it is firm with the dynamic of main loading spring
Degree is adapted, and meets that different type rotary axis, difference contract than the loading needs of ratio test-bed.
4) this loading device has low dynamic stiffness characteristic, can apply the loading excitation dress of longitudinal dead load and dynamic loading at the same time
Put.
Brief description of the drawings
Fig. 1 is the low dynamic stiffness longitudinal direction loading exciting device schematic diagram for rotary axis；
Wherein, 1- locking nuts, 2- thrust bearings, 3- rotating rings, 4- friction tops, 5- bolts, 6- secondary springs, 7- add
Load plate, 8- loading screw rods, 9- main springs, 10- hold-down supports, 11- electromagnetic attraction modules, 12- exciting rod 13- electromagnetic exciters.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the utility model is described in more detail.
A kind of rotary axis longitudinal loading loading device composition with low dynamic stiffness characteristic of the utility model is as follows：It is servo-actuated
Rotary module, loading spring, loading disc 7, loading screw rod 8, hold-down support 10, electromagnetic attraction module 11, exciting rod 12 and electromagnetism
Vibrator 13, wherein servo rotary module are made of thrust bearing 2, rotating ring 3, friction top 4 and locking nut 1, load bullet
Spring is made of secondary spring 6 and main spring 9.
2 inner ring sleeve of thrust bearing is mounted in the front end of loading disc 7, and locking nut 1 is cyclic structure, machining internal thread,
Identical with the external screw thread specification of loading disc front end, locking nut 1 locks thrust bearing 2.Thrust bearing 2 can root
Needed according to test-bed longitudinal direction ability, select national standard bearing purchased in market, double-row conical bearing or single-row circular cone can be selected to roll
Sub- bearing.Rotating ring 3 is cylinder " recessed " shape, and bolt hole is opened in bottom, is connected using connection bolt with rotary axis end thread hole, spiral shell
Line rotation direction is with shafting rotation direction on the contrary, 2 outer shroud of thrust bearing is installed on the inside of rotating ring 3.Open screw thread in 3 end face of rotating ring
Hole, for the lid 4 that is fixed and clamped.4 middle perforate of friction top, loading disc 7 is not contacted with friction top 4 after installation is complete.
Loading disc 7 is overall structure, and using magnetic steel material overall processing, front portion is multidiameter structure, for installed thrust
Rolling bearing 2.7 rear end of loading disc is designed as disc-shape, and for bearing the longitudinal thrust of loading spring generation, disk is close to outer
Installation through-hole is opened at edge, for the loading screw rod through loading spring.Threaded hole is opened at 7 posterior center of loading disc, for connecting
Electromagnetic exciter exciting rod 12.
Main spring 9 is sleeved on the thin portion of loading screw rod 8, and front end is pressed on loading disc 7.Secondary spring 6 is sleeved on loading
The thin portion end of screw rod 8, coordinates with bolt 5 and compresses loading screw rod 8 with loading disc 7.Bolt 5, secondary spring 6 and main spring 9
The commercial products for meeting national standard can be selected according to longitudinal loaded load size.When being designed type selecting, secondary spring 6
It is consistent with the Static stiffness of main spring 9.
The size of loading screw rod 8 is designed according to the size of secondary spring 6 and main spring 9.Load the processing of 8 front end of screw rod
Screw thread, for installation bolt 5.Load screw rod 8 rearward diameter and be more than front portion, process screw thread, for 10 front panel of hold-down support
On threaded hole coordinate.Loading 8 least significant end of screw rod is designed as hexagonal or square shape, is easy to use spanner to carry out turn operation.
Spring conductor rod is played the role of in the front portion (thin portion) of loading screw rod 8, and rear portion (thick portion) plays the role of holddown spring.This practicality is new
Type turn loading screw rod 8, the length of main spring 9 can elongate or shorten therewith so that the longitudinal thrust for acting on loading disc subtracts
Small or increase, and rotary axis end is further transferred to by loading disc 7, servo rotary module, realize to rotary axis
Longitudinal static loading and static loading power adjustment.
Hold-down support 10 is soldering frame rack and panel construction, and size is according to the requirement of test-bed fixing link, electromagnetic exciter 13
Size is designed.The rigidity needs of hold-down support 10 are sufficiently strong, its modal frequency is tried one's best high, should carry out mode if necessary and set
Meter, makes its first step mode frequency values for more than 3 times of the important longitudinal natural frequency value of shafting.Opened on 10 front panel of hold-down support
Threaded hole is to install loading screw rod 8, and perforate is to pass through the exciting rod 12 of electromagnetic exciter in the middle part of front panel.Hold-down support uses spiral shell
Bolt is fixedly mounted on test-bed pedestal or platform.
Electromagnetic attraction module 11, be made of direct current supply electromagnet, shell, supporting conducting wire, DC power supply.Electromagnetic attraction mould
Block 11 is designed to hollow so that electromagnetic exciter exciting rod 12 can be to pass through.Electromagnet and DC power supply according to design parameter,
Select the commercial products for meeting national standard.The size and interface of shell are designed according to electromagnet and DC power supply size,
Using bolt be rigidly attached at on hold-down support 10, electromagnet produce electromagnetic force, act on loading disc.
The utility model electromagnetic exciter 13 is used to apply dynamic load, using rigidly fixing or flexible suspension is installed on
On hold-down support 10, exciting rod 12 through the front panel perforate of hold-down support, 11 interstitial hole of electromagnetic attraction module without with the two
Contact, is rigidly connected with loading disc 7.Electromagnetic exciter 13 and exciting rod 12 meet country according to dynamic ex-citing forces needs, selection
The commercial products of standard.
Specific installation step is as follows：
A. thrust bearing 2 is installed on 7 front end of loading disc, and is locked with locking nut 1；
B. the bolt of rotating ring 3 is installed on rotation shaft end；
C. thrust bearing 2, the assembly of loading disc 7 and locking nut 1 and rotating ring 3 are assembled, makes the thrust axis of rolling
Hold 2 outer shroud and the minor diameter fit of rotating ring 3；
D. friction top 4 is installed on rotating ring end face with bolt, friction top 4 is held out against the outer shroud of thrust bearing；
E. electromagnetic attraction module 11 is installed on hold-down support 10；
F. loading screw rod 8 is installed on hold-down support 10, it is desirable to each to load peace of the screw rod 8 relative to hold-down support 10
It is identical to fill length；
G. main spring 9 is sleeved on loading screw rod 8；
H. according to 9 length dimension of main spring, the lengthwise position of hold-down support 10 is primarily determined that, arrangement hold-down support 10, add
The assembly of screw rod 8, electromagnetic attraction module 11 and main spring 9 is carried, loading screw rod 8 is passed through from the mounting hole of loading disc 7；
I. secondary spring 6 is sleeved on loading screw rod 8 from the part that loading disc 7 stretches out, and installation bolt 5, it is desirable to it is each
Equal length after secondary spring 6 is compressed；
J. according to rotary axis centerline height, the height of hold-down support 10 is adjusted, makes thrust bearing 2, loading disc 7
Align with the center line of electromagnetic attraction module 11, and hold-down support 10 is fixedly mounted on test-bed platform or pedestal；
K. exciting rod 12 is passed through from the perforate of hold-down support 10, electromagnetic attraction module 11 and loading disc 7, with loading disc
Threaded hole connection on 7；
L. electromagnetic exciter 13 is suspended on hold-down support 10 using flexible strand, adjusts suspension height, make exciting rod 12
On shafting axial line；
M. the power supply of electromagnetic attraction module 11 is connected；
N. the power supply and control system of electromagnetic exciter 13 are connected.
After installation is complete, turn loading screw rod 8, the length of main spring 9 changes, and longitudinal loading force changes therewith, adds
Power size is carried to be calculated according to the length change of main spring 9.Electromagnetic attraction module 11 is connected, exports electromagnetic force.Start rotation
Shafting, is adjusted to corresponding running speed.Needs are encouraged according to test behaviour, the output to electromagnetic exciter 13 is controlled,
Corresponding dynamic ex-citing forces are exported, then carry out test.
The utility model has the characteristics that：
If electromagnet front end and the gap of loading back-end disk are δ, the size F of electromagnetic force can be expressed as：
In above formula, J is excitation current；S is the cross-sectional area of magnetic circuit；A is structure dependent proportionality constant, Ke Yitong
Overtesting test obtains.
When rotary axis operates, extensional vibration occurs, longitudinal dynamic displacement correspondingly occurs for loading disc, adds so as to cause
Carry acting force of the spring, the dynamic change of electromagnetic force.If magnetic gap, which becomes, turns to d δ, then the change of electromagnetic force turns to
Therefore, dynamic stiffness caused by electromagnet is
In above formula, negative sign represents the direction of electromagnetic force rigidity with spring rate direction on the contrary, the direction that i.e. electromagnetic force changes
It is identical with the change direction of dynamic displacement.
If main spring dynamic stiffness is kSpring, then the dynamic rate of loading device is
kAlways=kSpring+kElectromagnetism
Due to kElectromagnetismDirection and kSpringDirection will be on the contrary, therefore, the dynamic rate of the present apparatus will be less than pure spring loads state
kSpring.According to rotary axis longitudinal rigidity scope, main spring parameter, electromagnetism force parameter can be rationally set, when parameter setting is suitable
When, kAlwaysIt can become very little, so as to reduce or even eliminate influence of the loading device dynamic rate to rotary axis longitudinal mode.
In conclusion the above is only the preferred embodiments of the present utility model only, the utility model is not intended to limit
Protection domain.Where within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on, should all wrap
It is contained within the scope of protection of the utility model.
Claims (6)
1. a kind of rotary axis longitudinal loading loading device with low dynamic stiffness characteristic, it is characterised in that including servo rotary
Module, loading disc (7), loading spring, loading screw rod (8), electromagnetic attraction module (11), exciting rod (12), electromagnetic exciter
(13) and hold-down support (10), wherein, the loading spring is made of main spring (9) and secondary spring (6)；
One end of the loading screw rod (8) is fixed on the front panel of hold-down support (10), and the other end passes through loading disc (7), institute
State on the loading screw rod (8) that main spring (9) is sleeved between hold-down support (10) and loading disc (7), secondary spring (6) set
Mounted in the end of loading screw rod (8), coordinate with bolt and compress loading screw rod (8) with loading disc (7)；The servo rotary module
The front end of loading disc (7) is installed on, for being connected with rotary axis；The electromagnetic attraction module (11) is installed on hold-down support
(10) on front panel, electromagnetic exciter (13) rigidly fixes or flexible suspension is on hold-down support (10), and exciting rod (12) passes through
Hold-down support (10) front panel perforate, electromagnetic attraction module (11) interstitial hole and the center of loading disc (7) rear end face are fixed.
2. there is the rotary axis longitudinal loading loading device of low dynamic stiffness characteristic according to claim 1, it is characterised in that
The servo rotary module is made of thrust bearing (2), rotating ring (3), friction top (4) and locking nut (1)；Thrust rolls
Bearing (2) inner ring sleeve is mounted in the front end of loading disc (7), and is locked with locking nut (1)；Thrust bearing (2) outer shroud is installed
Held out against in the inside of rotating ring (3), and with friction top (4)；The rotating ring (3) is connected with rotary axis terminal stud.
3. there is the rotary axis longitudinal loading loading device of low dynamic stiffness characteristic according to claim 1, it is characterised in that
The diameter at described loading screw rod (8) rear portion is more than front portion, is threaded on rear portion, before screw thread and hold-down support (10)
Threaded hole on plate, which coordinates, to be fixed.
4. there is the rotary axis longitudinal loading loading device of low dynamic stiffness characteristic according to claim 2, it is characterised in that
The rotating ring (3) is connected using connection bolt with rotary axis end thread hole, and thread rotary orientation is opposite with shafting rotation direction.
5. there is the rotary axis longitudinal loading loading device of low dynamic stiffness characteristic according to claim 1, it is characterised in that
The Static stiffness of the main spring (9) and secondary spring (6) is consistent.
6. there is the rotary axis longitudinal loading loading device of low dynamic stiffness characteristic according to claim 1, it is characterised in that
The first step mode frequency values of the hold-down support (10) are more than 3 times of the important longitudinal natural frequency value of shafting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721155643.9U CN207336067U (en) | 2017-09-07 | 2017-09-07 | A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721155643.9U CN207336067U (en) | 2017-09-07 | 2017-09-07 | A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device |
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| CN207336067U true CN207336067U (en) | 2018-05-08 |
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| CN201721155643.9U Expired - Fee Related CN207336067U (en) | 2017-09-07 | 2017-09-07 | A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345856A (en) * | 2017-09-07 | 2017-11-14 | 中国船舶重工集团公司第七〇九研究所 | A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device |
| CN111964735A (en) * | 2020-09-30 | 2020-11-20 | 中国船舶科学研究中心 | Dynamic characteristic test system for ship propulsion shafting |
-
2017
- 2017-09-07 CN CN201721155643.9U patent/CN207336067U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345856A (en) * | 2017-09-07 | 2017-11-14 | 中国船舶重工集团公司第七〇九研究所 | A kind of low dynamic stiffness for rotary axis longitudinally loads exciting device |
| CN111964735A (en) * | 2020-09-30 | 2020-11-20 | 中国船舶科学研究中心 | Dynamic characteristic test system for ship propulsion shafting |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180508 Termination date: 20190907 |
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| CF01 | Termination of patent right due to non-payment of annual fee |