CN109323831A - A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload - Google Patents
A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload Download PDFInfo
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- CN109323831A CN109323831A CN201811033562.0A CN201811033562A CN109323831A CN 109323831 A CN109323831 A CN 109323831A CN 201811033562 A CN201811033562 A CN 201811033562A CN 109323831 A CN109323831 A CN 109323831A
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- elongated shaft
- equivalent force
- hammer
- preload
- acquisition instrument
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to mould measurement technical fields, and in particular to a kind of elongate rotation shaft modal test device for discharging advocate approach suddenly based on preload.Including motor, sliding bearing, equivalent force hammer, elongated shaft, disk, rope, weight, Acquisition Instrument；Motor connects elongated shaft, and there are two sliding bearing and a disk on elongated shaft, disk is located at elongated shaft right end, and equivalent force hammer is located between two sliding bearings, and equivalent force, which is hammered into shape, connects weight by rope.When device works, Acquisition Instrument connects equivalent force hammer, and two current vortex sensors are installed on elongated shaft, and two current vortex sensors are located at equivalent force hammer both sides, and two current vortex sensors also connect Acquisition Instrument, and Acquisition Instrument connects computer.A kind of elongate rotation shaft modal test device for being discharged advocate approach suddenly based on preload that the present invention designs, which can be measured more accurately, guarantees the oil film completely mode with elongated shaft under motion state, has a extensive future.
Description
Technical field
The invention belongs to mould measurement technical fields, and in particular to a kind of to discharge the thin of advocate approach suddenly based on preload
Long rotary shaft modal test device.
Technical background
Mould measurement is the important means for obtaining structural member vibration characteristics, is being estimated and failure side existing for deagnostic structure part
There is great role in face, in order to analyze the vibration characteristics of elongate rotation shaft, need to test the mode of elongate rotation shaft.Traditional
The method that mould measurement generally uses is that hammer stimulating surveys modal method, it may be assumed that firmly hammer is to tap shaft part, with sensor collection difference
Vibratory response at position is analyzed to obtain the test method of shafting mode based on software.However for the mode of elongate rotation shaft
In test experiments if using traditional hammer stimulating method, data will appear phenomena such as coherence's difference is with double-clicking when acquiring, and cause
The experimental result of mould measurement is unsatisfactory.By analysis, if taking the mould of hammer stimulating modal method test elongate rotation shaft
State can have the following problems:
1. it is poor to tap coherence every time.Due to axis be elongated shaft, axis diameter and power hammer tup adjoining dimensions, then every time
Percussion all cannot be guaranteed at the same angle and beating point is motivated；And axis can rotate freely in sliding bearing, with
The carry out axis that the taps direction of acceleration transducer that can deflect, and be fixed on shaft part can change.It is above because
Element causes during the test, and the percussion coherence of power spectrum is particularly poor.
2. being easy to appear double-click.Axis is elongated shaft, is equivalent to the axis of large span, smaller perpendicular to axis direction rigidity；
Meanwhile test is firmly hammered into shape as " big " power hammer for shafting.So the double-click situation that takes place frequently during the test, causes to try
Test inefficiency.
3. not formed oil film at bearing.It surveys modal method due to traditional hammer stimulating to carry out in the quiescent state, at bearing
There is no form oil film.During the work time, oil film provides a supporting role for shafting.Therefore modal test should consider that oil film is rigid
Degree, and oil film rigidity influences significantly lower mode.It only obtains setting up the system mode after oil film, can carry out
Accurate system response computation.
Summary of the invention
The purpose of the present invention is to provide one kind can accurately test the unexpected based on preload of elongate rotation shaft mode
Discharge the elongate rotation shaft modal test device of advocate approach.
A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload, including motor, sliding
Bearing, equivalent force hammer, elongated shaft, disk, rope, weight, Acquisition Instrument；Motor connects elongated shaft, and there are two slidings on elongated shaft
Bearing and a disk, disk are located at elongated shaft right end, and equivalent force hammer is located between two sliding bearings, and equivalent force hammer passes through
Rope connects weight.
A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload, equivalent force hammer packet
Include nut, force snesor, counterweight, bearing shell, nylon cushion, spring, force snesor is located at counterweight left end, and force snesor is solid by nut
Fixed, equivalent force hammer is fixed on elongated shaft by drag hook on the right of counterweight, there is bearing shell and nylon cushion, drag hook between elongated shaft and drag hook
The right connecting spring.
A kind of elongate rotation shaft modal test device discharging advocate approach suddenly based on preload, device work
When, Acquisition Instrument connects equivalent force hammer, installs two current vortex sensors on elongated shaft, two current vortex sensors are located at
Effect hammers both sides into shape, and two current vortex sensors also connect Acquisition Instrument, and Acquisition Instrument connects computer.
The beneficial effects of the present invention are:
The present invention devises equivalent force hammer, guarantee can be rotated in shafting in view of the static difference with when movement of shafting
In the case where excitation is provided, carry out mould measurement.Influence in view of oil film rigidity to mould measurement, the test that the present invention designs
Device can be in the case where guaranteeing not destroy oil film, and shaft carries out mould measurement.Equivalent force hammer action principle guarantees simultaneously
Each percussion is at the same angle and beating point is motivated, and elongated shaft can rotate freely in sliding bearing, elongated shaft
It will not deflect because of excitation, the direction of fixed acceleration transducer will not change, therefore improve what power hammer tapped
Coherence.A kind of elongate rotation shaft modal test device for discharging advocate approach suddenly based on preload that the present invention designs can
It more accurately measures and guarantees the oil film completely mode with elongated shaft under motion state.
Detailed description of the invention
Fig. 1 is principle schematic diagram of the present invention；
Fig. 2 is that equivalent force of the present invention hammers schematic diagram into shape；
Fig. 3 is connection schematic diagram of the present invention；
Fig. 4 is position view at the end of equivalent force of the present invention hammer experiment.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Fig. 1, a kind of elongate rotation shaft for discharging advocate approach suddenly based on preload designed for the present invention
Mould measurement principle of device schematic diagram；Including motor 1, sliding bearing 2, equivalent force hammer 3, elongated shaft 4, sliding bearing 5, disk 6,
Rope 7, rope 8, weight 9, Acquisition Instrument 16；Motor 1 connects elongated shaft 4, has sliding bearing 2,5 and disk 6, disk on elongated shaft
Positioned at elongated shaft right end, equivalent force hammer 3 is located between two sliding bearings, and equivalent force hammer connects weight 9 by rope 8.
As shown in Fig. 2, a kind of elongate rotation shaft for discharging advocate approach suddenly based on preload designed for the present invention
Mould measurement device equivalent force hammers schematic diagram into shape；Attached drawing 4 is that one kind that the present invention designs discharges advocate approach based on preload suddenly
Elongate rotation shaft mould measurement device equivalent force hammer experiment at the end of position view.Equivalent force hammer 3 includes nut 10, and power passes
Sensor 11, counterweight 12, bearing shell 13, nylon cushion 14, spring 15, force snesor 11 are located at 12 left end of counterweight, and force snesor passes through spiral shell
Mother 10 is fixed, and equivalent force hammer is fixed on elongated shaft 4 by drag hook on the right of counterweight, there is bearing shell 13 and Buddhist nun between elongated shaft and drag hook
Imperial pad 14, drag hook the right connecting spring 15.
As shown in Fig. 3, a kind of elongate rotation shaft for discharging advocate approach suddenly based on preload designed for the present invention
Mould measurement device connection schematic diagram；When device works, Acquisition Instrument 16 connects equivalent force hammer 3, installation two electric whirlpools on elongated shaft 4
Flow sensor 18, two current vortex sensors are located at equivalent force hammer both sides, and two current vortex sensors also connect Acquisition Instrument
16, Acquisition Instrument connects computer 17.
Preload of the weight 9 as shafting, cuts in test suddenly or when with the rope 8 for burning disconnected lifting weight,
The preload of shafting discharges suddenly at this time, and the excitation in this, as shafting carries out mould measurement.Equivalent force hammer 3 is entirely to test
Most critical component in equipment, wherein counterweight 12 determines that the amplitude size of impact force, counterweight 12 can select plurality of specifications, when matching
Weigh 12 it is big when, equivalent force hammer 3 input power amplitude it is big, vice versa；Force snesor 11 can be measured when F2=0 is instantaneous, be made
With the Reeb momentum in shafting, which is collected the acquisition of instrument 16 and is used for modal calculation；F2 is the weight of weight 9, as
The preload of shafting；The size of F1 is the gravity of equivalent force hammer 3, the position of centre of gravity that position passes through equivalent force hammer 3；Bearing shell
13 are bonded with 4 surface of elongated shaft, and bearing shell 13 smaller smooth can be slided with rubbing between elongated shaft 4；Nylon cushion 14 influences to tap
The pulsewidth of power can select the material of unlike material different hardness to obtain fluid shock input power；15 original state of spring is
It stretches, effect is after cutting rope 8 as F2=0 in order to prevent, and spring 15 then restores former length, prevents equivalent force from hammering 3 into shape
The multiple percussion of shaft.
The weight for selecting appropriate weight, connects test apparatus.After the completion of instrument connection, debugging test macro can normal work
After work, it can start to test:
Step 1: the power conditions in checkout facility place；It completes on test computer to channel, transducer sensitivity, touching
After the parameter settings such as hair, bis- Walk can be carried out after establishing test model；
Bis- Walk: starting motor, when motor speed being allowed to rise to suitable rotational speed, waits and establishes stable oil film at sliding bearing
When, second step can be carried out；
Step 3: checking again for whether test macro is in normal condition, if normal, is cut with scissors or mentioned with burning to break
The rope 8 of hoist object, at this moment loading the load in shafting will discharge suddenly, motivate the shafting under oil film rigidity support
Mode.Equivalent force hammer 3, completely separable with shaft under the action of spring 15 after cutting rope 8, not will form the multiple of shaft
It taps；
Step 4: in the reasonability of testing ground checkout facility result, if no problem carries out next measurement or terminates test；
Step 5: test apparatus is withdrawn, repairing experiment scene；
The above present invention provides opening one's minds for elongate rotation shaft mould measurement, and the proposition of thought, similar approach is equal
Belong to this patent coverage area.
Claims (3)
1. a kind of elongate rotation shaft modal test device for discharging advocate approach suddenly based on preload, including motor, sliding axle
It holds, equivalent force hammer, elongated shaft, disk, rope, weight, Acquisition Instrument；It is characterized by: motor connects elongated shaft, have on elongated shaft
Two sliding bearings and a disk, disk are located at elongated shaft right end, and equivalent force hammer is located between two sliding bearings, equivalent
Power hammer connects weight by rope.
2. a kind of elongate rotation shaft modal test dress for discharging advocate approach suddenly based on preload according to claim 1
It sets, it is characterised in that: the equivalent force hammer includes nut, force snesor, counterweight, bearing shell, nylon cushion, spring, force snesor position
In counterweight left end, force snesor is fixed by nut, and equivalent force hammer is fixed on elongated shaft by drag hook on the right of counterweight, elongated shaft
There are bearing shell and nylon cushion, connecting spring on the right of drag hook between drag hook.
3. a kind of elongate rotation shaft modal test dress for discharging advocate approach suddenly based on preload according to claim 1
It sets, it is characterised in that: when device works, the Acquisition Instrument connection equivalent force is hammered into shape, and two current vortex sensors are installed on elongated shaft,
Two current vortex sensors are located at equivalent force hammer both sides, and two current vortex sensors also connect Acquisition Instrument, Acquisition Instrument connection
Computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033562.0A CN109323831B (en) | 2018-09-05 | 2018-09-05 | Elongated rotating shaft modal test device based on preload sudden release excitation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811033562.0A CN109323831B (en) | 2018-09-05 | 2018-09-05 | Elongated rotating shaft modal test device based on preload sudden release excitation method |
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| Publication Number | Publication Date |
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| CN109323831A true CN109323831A (en) | 2019-02-12 |
| CN109323831B CN109323831B (en) | 2020-07-28 |
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| CN201811033562.0A Active CN109323831B (en) | 2018-09-05 | 2018-09-05 | Elongated rotating shaft modal test device based on preload sudden release excitation method |
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| CN109323831B (en) | 2020-07-28 |
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