CN109506912A - A kind of unmanned helicopter main hub center piece fatigue experimental device - Google Patents
A kind of unmanned helicopter main hub center piece fatigue experimental device Download PDFInfo
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- CN109506912A CN109506912A CN201811340591.1A CN201811340591A CN109506912A CN 109506912 A CN109506912 A CN 109506912A CN 201811340591 A CN201811340591 A CN 201811340591A CN 109506912 A CN109506912 A CN 109506912A
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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
- G01M13/00—Testing of machine parts
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Abstract
The application belongs to unmanned helicopter main hub center piece fatigue test technology field field, more particularly to a kind of unmanned helicopter main hub center piece fatigue experimental device, comprising: Rotor Simulation axis, one end are fixing end, the other end is support end, and fixing end with main hub center piece for being fixedly connected；Flexible beam bogusware, one end are connecting pin, and the other end is loading end, and connecting pin with main hub center piece for connecting；It is centrifuged force loading device, is connect with loading end, to apply centrifugal force for main hub center piece；Shimmy force loading device is connect with flexible beam bogusware outer wall, to apply shimmy power for main hub center piece；Force loading device is waved, is connect with flexible beam bogusware outer wall, to wave power for the application of main hub center piece；Wherein, the direction of centrifugal force, shimmy power direction and wave the direction of power and be mutually perpendicular to.
Description
Technical field
The application belongs to unmanned helicopter main hub center piece fatigue test technology field field, and in particular to it is a kind of nobody
Helicopter Main Hub center piece fatigue experimental device.
Background technique
Unmanned helicopter main hub center piece is the typical complex dynamic component in unmanned helicopter ball flexible hub, it passes through
Associated components bear whole load from blade, carry out Fatigue Test Research in face of its on ground, determine its fatigue properties and thin
Weak position can be improvement, the optimization of its structure, determine its maintenance cycle, formulate method for maintaining, and assess the offer examination of its service life
Test foundation.
Unmanned helicopter main hub center piece structure as shown in Figure 1, have fixed mounting hole 1, and in center piece thereon
The opposite flexible beam connecting hole 3 of the multiple groups opened up on support arm 2.Currently, lacking one kind can simulate in unmanned helicopter main hub
Central member by force boundary condition fatigue experimental device, ground in face of its carry out Fatigue Test Research in, cannot effectively to its into
Row load, from being unable to obtain accurate test data.
Thus, it is desirable to have a kind of technical solution overcomes or at least mitigates at least one drawbacks described above of the prior art.
Summary of the invention
The purpose of the application is to provide a kind of unmanned helicopter main hub center piece fatigue experimental device, to solve or mitigate
The defect of above-mentioned at least one aspect.
The technical solution of the application is:
A kind of unmanned helicopter main hub center piece fatigue experimental device, comprising:
Rotor Simulation axis, one end are fixing end, and the other end is support end, and fixing end with main hub center piece for fixing
Connection；
Flexible beam bogusware, one end are connecting pin, and the other end is loading end, and connecting pin is used to connect with main hub center piece
It connects；
It is centrifuged force loading device, is connect with loading end, to apply centrifugal force for main hub center piece；
Shimmy force loading device is connect with flexible beam bogusware outer wall, to apply shimmy power for main hub center piece；
Force loading device is waved, is connect with flexible beam bogusware outer wall, to wave power for the application of main hub center piece；Wherein,
The direction of centrifugal force, shimmy power direction and wave the direction of power and be mutually perpendicular to.
According at least one embodiment of the application, when Rotor Simulation axis is fixedly connected with main hub center piece, fixing end
It is fixed in the fixed mounting hole of main hub center piece；
Connecting pin is provided with connection monaural piece；
When connecting pin is connect with main hub center piece, connection monaural piece be arranged in main hub center piece two support arms it
Between, flexible beam connects bolt and passes through the flexible beam connecting hole on two support arms and connect the through-hole setting of monaural on piece.
According at least one embodiment of the application, support end is provided with support disk；
Above-mentioned fatigue experimental device further includes having:
Transition axis, one end are provided with transition disk, and the other end is provided with fixed disc, transition disk and support disk pair
It connects, and is bolted；
Test platform, fixed disc are bolted in support platform.
According at least one embodiment of the application, being centrifuged force loading device includes:
It is centrifuged transit joint, one end is connect with connecting pin；
It is centrifuged pressurized strut, one end is connect with the other end of centrifugation transit joint.
According at least one embodiment of the application, being centrifuged force loading device further includes that there are two pulleys, passes through wirerope
Connection；Wherein,
The one end of centrifugation transit joint far from centrifugation pressurized strut is arranged in one pulley；
Another pulley is arranged in connecting pin.
According at least one embodiment of the application, shimmy force loading device includes:
Shimmy connection component is connect with flexible beam bogusware outer wall；
Shimmy transit joint, one end are connect with shimmy connection component；
Shimmy pressurized strut, one end are connect with the other end of shimmy transit joint.
According at least one embodiment of the application, shimmy connection component includes:
Shimmy set, the inner wall of one end are provided with shimmy set limit protrusion, and shimmy transit joint is far from shimmy pressurized strut
One end is screwed onto the outer wall of shimmy set；
Shimmy self-aligning roller bearing is arranged inside shimmy set；
Shimmy ring is fixedly installed in shimmy set the other end face, and the wall surface close to shimmy set side is provided with shimmy ring
Limit protrusion；Wherein, shimmy ring limit protrusion is matched for clamping tightly the outer ring of shimmy self-aligning roller bearing with shimmy set limit protrusion；
Shimmy sleeve is equipped with shimmy self-aligning roller bearing inner ring, and is socketed on flexible beam bogusware.
According at least one embodiment of the application, shimmy force loading device further includes having:
Shimmy limit plate is sleeved and fixed on flexible beam bogusware, is axially offered along flexible beam bogusware thereon multiple shimmy
Limiting through hole, each shimmy limiting through hole are uniformly distributed circumferentially；
Multiple shimmy caging bolts, each shimmy caging bolt are threadedly engaged with a vibration limiting through hole and connect, and with pendulum
The ring that shakes is abutted far from the wall surface of shimmy set side.
According at least one embodiment of the application, waving force loading device includes:
Set is waved, the inner wall of one end, which is provided with, waves set limit protrusion；
Self-aligning roller bearing is waved, setting waves set and waves set inside；
Ring is waved, set the other end face fixed setting is being waved, is being provided with close to the wall surface for waving set side and waves ring
Limit protrusion；Wherein, it waves ring limit protrusion and is matched for clamping tightly the outer ring for waving self-aligning roller bearing with set limit protrusion is waved；
Sleeve is waved, is equipped with self-aligning roller bearing inner ring is waved, and be socketed on flexible beam bogusware；
Limit plate is waved, is sleeved and fixed on flexible beam bogusware, axially offers multiple wave along flexible beam bogusware thereon
Limiting through hole, each limiting through hole of waving are uniformly distributed circumferentially；
It is multiple to wave caging bolt, each wave caging bolt and be threadedly engaged with a vibration limiting through hole and connect, and with wave
Dance ring is abutted far from the wall surface for waving set side；
Transit joint is waved, one end is spirally connected with set is waved；
Pressurized strut is waved, one end is connect with the other end for waving transit joint.
According at least one embodiment of the application, waving force loading device further includes waving load support, and fixation is set
It sets on test platform, waves pressurized strut and connect far from the one end for waving transit joint with load support is waved.
At least there are following advantageous effects in the application: a kind of unmanned helicopter main hub center piece fatigue test dress
It sets, which carries out main hub center piece by force boundary condition, using it
That fatigue test can be obtained is convenient, is effectively obtained correlation test data.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of unmanned helicopter main hub center piece provided by the embodiments of the present application
Fig. 2 is unmanned helicopter main hub center piece fatigue experimental device part-structure signal provided by the embodiments of the present application
Figure；
Fig. 3 is the knot of the another part of unmanned helicopter main hub center piece fatigue experimental device provided by the embodiments of the present application
Structure schematic diagram；
Fig. 4 is the structural schematic diagram of shimmy connection component provided by the embodiments of the present application.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related application, rather than the restriction to this application.It also should be noted that in order to
Convenient for description, part relevant to the application is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
It should be noted that in the description of the present application, term " center ", "upper", "lower", "left", "right", "vertical",
The direction of the instructions such as "horizontal", "inner", "outside" or the term of positional relationship are direction based on the figure or positional relationship, this
It is intended merely to facilitate description, rather than indication or suggestion described device or element must have a particular orientation, with specific
Orientation construction and operation, therefore should not be understood as the limitation to the application.In addition, term " first ", " second ", " third " are only used
In description purpose, it is not understood to indicate or imply relative importance.
In addition it is also necessary to explanation, in the description of the present application unless specifically defined or limited otherwise, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.To those skilled in the art, it can understand that above-mentioned term exists as the case may be
Concrete meaning in the application.
1 to Fig. 4 the application is described in further details with reference to the accompanying drawing.
A kind of unmanned helicopter main hub center piece fatigue experimental device, comprising:
Rotor Simulation axis 4, one end are fixing end, and the other end is support end, and fixing end is used for solid with main hub center piece
Fixed connection；
Flexible beam bogusware 5, one end are connecting pin, and the other end is loading end, and connecting pin is used to connect with main hub center piece
It connects；
It is centrifuged force loading device, is connect with loading end, to apply centrifugal force for main hub center piece；
Shimmy force loading device is connect with 5 outer wall of flexible beam bogusware, to apply shimmy power for main hub center piece；
Force loading device is waved, is connect with 5 outer wall of flexible beam bogusware, to wave power for the application of main hub center piece；Wherein,
The direction of centrifugal force, shimmy power direction and wave the direction of power and be mutually perpendicular to.
In some alternative embodiments, when Rotor Simulation axis 4 is fixedly connected with main hub center piece, fixing end fixation is set
It sets in the fixed mounting hole 1 of main hub center piece；Connecting pin is provided with connection monaural piece；Connecting pin and main hub center piece connect
When connecing, connection monaural piece is arranged between two support arms 2 of main hub center piece, and flexible beam connects bolt and passes through two support arms 2
On flexible beam connecting hole 3 and connect monaural on piece through-hole setting.
In some alternative embodiments, support end is provided with support disk；Above-mentioned fatigue experimental device further includes having: mistake
Axis 6 is crossed, one end is provided with transition disk, and the other end is provided with fixed disc, and transition disk is docked with support disk, and is passed through
It is bolted；Test platform 7, fixed disc is bolted in support platform.
The height of above-mentioned transition axis 6 can be set according to test actual demand, can realize Rotor Simulation axis 4 and test
The transition of platform connects.
In some alternative embodiments, centrifugation force loading device includes: centrifugation transit joint 8, and one end and connecting pin connect
It connects；It is centrifuged pressurized strut 9, one end is connect with the other end of centrifugation transit joint 8.
In some alternative embodiments, centrifugation force loading device further includes that there are two pulleys 10, is connected by wirerope；
Wherein, the one end of centrifugation transit joint 8 far from centrifugation pressurized strut 9 is arranged in a pulley 10；The setting of another pulley 10 is even
Connect end.
By the pulley assembly being made of above-mentioned two pulley 10 and wirerope, connects connecting pin and centrifugation transit joint 8 is remote
One end of luxuriant heart pressurized strut 9 can guarantee that the centering of applied centrifugal force and stablizing for centrifugal force apply；In addition, because
Wirerope is flexible, and can guarantee centrifugal force in unloading, the thrust for carrying out self-reversal will not be applied on testpieces, can be protected
Protect testpieces.
In some alternative embodiments, shimmy force loading device includes: outside shimmy connection component, with flexible beam bogusware 5
Wall connection；Shimmy transit joint 11, one end are connect with shimmy connection component；Shimmy pressurized strut 12, one end and shimmy transit joint
11 other end connection.
In some alternative embodiments, shimmy connection component includes: shimmy set 13, and the inner wall of one end is provided with shimmy
Set limit protrusion, shimmy transit joint 11 are screwed onto the outer wall of shimmy set 13 far from one end of shimmy pressurized strut 12；Shimmy aligning
Roller bearing 14 is arranged inside shimmy set 13；Shimmy ring 15 is fixedly installed, close to shimmy in shimmy 13 the other end face of set
The wall surface for covering 13 sides is provided with shimmy ring limit protrusion；Wherein, shimmy ring limit protrusion and shimmy set limit protrusion cooperation folder
The outer ring of tight shimmy self-aligning roller bearing 14；Shimmy sleeve 16 is equipped with shimmy 14 inner ring of self-aligning roller bearing, and is covered
It connects on flexible beam bogusware 5.
When being tested using above-mentioned experimental rig, shimmy self-aligning roller bearing 14 can automatic aligning and can bear centainly
Radial and axial load, it is equipped with shimmy sleeve 16, freely it can slide and fix on flexible beam bogusware 5, it can be convenient
The position of shimmy power load(ing) point on flexible beam bogusware 5 is adjusted, to guarantee accurately to apply shimmy power, meets test requirements document.
In some alternative embodiments, shimmy force loading device further includes having: shimmy limit plate 17 is sleeved and fixed soft
Property beam bogusware 5 on, offer multiple shimmy limiting through hole along flexible beam bogusware 5 is axial thereon, each shimmy limiting through hole is along week
To being uniformly distributed；Multiple shimmy caging bolts 18, each shimmy caging bolt 18 are threadedly engaged with a vibration limiting through hole and connect,
And it is abutted with shimmy ring 15 far from the wall surface of shimmy 13 side of set.
Shimmy limit plate 17 and shimmy caging bolt 18 are set, on the one hand can prevent shimmy set 13 from reversing, on the other hand
Shimmy set 13 can also be limited along 5 axial jump of flexible beam bogusware.
In some alternative embodiments, waving force loading device includes: to wave set 19, and the inner wall of one end, which is provided with, to be waved
19 limit protrusion of dance set；Self-aligning roller bearing is waved, setting is waved set 19 and waved inside set 19；Ring is waved, it is another waving set 19
The fixed setting of one end end face is provided with close to the wall surface for waving 19 sides of set and waves ring limit protrusion；Wherein, ring limit is waved
It protrudes and waves 19 limit protrusion of set and be matched for clamping tightly the outer ring for waving self-aligning roller bearing；Sleeve is waved, is rolled with aligning is waved
Sub- bearing inner race is equipped with, and is socketed on flexible beam bogusware 5；Limit plate 20 is waved, is sleeved and fixed in flexible beam bogusware 5
On, thereon along flexible beam bogusware 5 it is axial offer it is multiple wave limiting through hole, each limiting through hole of waving circumferentially uniformly is divided
Cloth；It is multiple to wave caging bolt 21, each wave caging bolt 21 and be threadedly engaged with a vibration limiting through hole and connect, and with wave
Ring is abutted far from the wall surface for waving 19 sides of set；Transit joint 22 is waved, one end is spirally connected with set 19 is waved；
Pressurized strut 23 is waved, one end is connect with the other end for waving transit joint 22.
In some alternative embodiments, waving force loading device further includes waving load support 24, is fixed at
On test platform 7, waves pressurized strut 23 and connect far from the one end for waving transit joint 22 with load support 24 is waved.
In some alternative embodiments, centrifugation force loading device further includes having centrifugation load support 25, is centrifuged pressurized strut 9
One end far from centrifugation transit joint 8 is connect with centrifugation load support 25.
In some alternative embodiments, shimmy force loading device further includes having shimmy load support 26, shimmy pressurized strut
12 one end far from shimmy transit joint 11 is connect with shimmy load support 26.
For it will be readily appreciated by those skilled in the art that waving and adding when using experimental rig disclosed in the present application
Carry support 24, centrifugation load support 25 and shimmy load support 26 can fixation in place according to actual needs, height
Adjusting can be tested by becoming the height of bottom.
So far, it has been combined preferred embodiment shown in the drawings and describes the technical solution of the application, still, this field
Technical staff is it is easily understood that the protection scope of the application is expressly not limited to these specific embodiments.Without departing from this
Under the premise of the principle of application, those skilled in the art can make equivalent change or replacement to the relevant technologies feature, these
Technical solution after change or replacement is fallen within the protection scope of the application.
Claims (10)
1. a kind of unmanned helicopter main hub center piece fatigue experimental device characterized by comprising
Rotor Simulation axis (4), one end are fixing end, and the other end is support end, and the fixing end is used for and main hub center piece
It is fixedly connected；
Flexible beam bogusware (5), one end are connecting pin, and the other end is loading end, the connecting pin be used for in the main hub
Central member connection；
It is centrifuged force loading device, is connect with the loading end, to apply centrifugal force for the main hub center piece；
Shimmy force loading device is connect with flexible beam bogusware (5) outer wall, shimmy to apply for the main hub center piece
Power；
Force loading device is waved, is connect with flexible beam bogusware (5) outer wall, to be waved for main hub center piece application
Power；Wherein,
The direction in the direction of the centrifugal force, the direction of the shimmy power and the power of waving is mutually perpendicular to.
2. fatigue experimental device according to claim 1, which is characterized in that
When the Rotor Simulation axis (4) is fixedly connected with the main hub center piece, the fixing end is fixed at the master
In the fixed mounting hole (1) of propeller hub center piece；
The connecting pin is provided with connection monaural piece；
When the connecting pin is connect with the main hub center piece, the main hub center piece is arranged in the connection monaural piece
Between two support arms (2), flexible beam connects bolt and passes through flexible beam connecting hole (3) on two support arms (2) and described
Connect the through-hole setting of monaural on piece.
3. fatigue experimental device according to claim 1, which is characterized in that
The support end is provided with support disk；
Further include having:
Transition axis (6), one end are provided with transition disk, and the other end is provided with fixed disc, the transition disk and the branch
Disk docking is held round, and is bolted；
Test platform (7), the fixed disc are bolted in the support platform.
4. fatigue experimental device according to claim 1, which is characterized in that the centrifugation force loading device includes:
It is centrifuged transit joint (8), one end is connect with the connecting pin；
It is centrifuged pressurized strut (9), one end is connect with the other end of centrifugation transit joint (8).
5. fatigue experimental device according to claim 3, which is characterized in that the centrifugation force loading device further includes having two
A pulley (10), is connected by wirerope；Wherein,
One pulley (10) setting is in the one end of centrifugation transit joint (8) far from centrifugation pressurized strut (9)；
Another described pulley (10) is arranged in the connecting pin.
6. fatigue experimental device according to claim 1, which is characterized in that the shimmy force loading device includes:
Shimmy connection component is connect with flexible beam bogusware (5) outer wall；
Shimmy transit joint (11), one end are connect with the shimmy connection component；
Shimmy pressurized strut (12), one end are connect with the other end of the shimmy transit joint (11).
7. fatigue experimental device according to claim 6, which is characterized in that the shimmy connection component includes:
Shimmy set (13), the inner wall of one end are provided with shimmy set limit protrusion, and the shimmy transit joint (11) is far from described
One end of shimmy pressurized strut (12) is screwed onto the outer wall of the shimmy set (13)；
It is internal that the shimmy set (13) is arranged in shimmy self-aligning roller bearing (14)；
Shimmy ring (15) is fixedly installed, close to shimmy set (13) side in shimmy set (13) the other end face
Wall surface is provided with shimmy ring limit protrusion；Wherein, the shimmy ring limit protrusion is matched for clamping tightly with the shimmy set limit protrusion
The outer ring of the shimmy self-aligning roller bearing (14)；
Shimmy sleeve (16) is equipped with shimmy self-aligning roller bearing (14) inner ring, and is socketed in the flexible beam
On bogusware (5).
8. fatigue experimental device according to claim 7, which is characterized in that the shimmy force loading device further includes having:
Shimmy limit plate (17) is sleeved and fixed on the flexible beam bogusware (5), axial along the flexible beam bogusware (5) thereon
Multiple shimmy limiting through hole are offered, each shimmy limiting through hole is uniformly distributed circumferentially；
Multiple shimmy caging bolts (18), each shimmy caging bolt (18) are threadedly engaged with a vibration limiting through hole
Connection, and abutted with the shimmy ring (15) far from the wall surface of shimmy set (13) side.
9. fatigue experimental device according to claim 3, which is characterized in that the force loading device of waving includes:
It waves set (19), the inner wall of one end, which is provided with, waves set (19) limit protrusion；
Self-aligning roller bearing is waved, set (19) is waved described in setting and waves set (19) inside；
Ring is waved, the fixed setting of set (19) the other end face is waved described, close to the wall surface for waving set (19) side
It is provided with and waves ring limit protrusion；Wherein, the ring limit protrusion of waving is matched for clamping tightly with set (19) limit protrusion of waving
The outer ring for waving self-aligning roller bearing；
Sleeve is waved, is equipped with the self-aligning roller bearing inner ring of waving, and is socketed in the flexible beam bogusware (5)
On；
Limit plate (20) are waved, are sleeved and fixed on the flexible beam bogusware (5), it is axial along the flexible beam bogusware (5) thereon
Offer it is multiple wave limiting through hole, it is each described to wave limiting through hole and be uniformly distributed circumferentially；
It is multiple to wave caging bolt (21), it is each described to wave caging bolt (21) and be threadedly engaged with a vibration limiting through hole
Connection, and abutted with the separate wall surface for waving set (19) side of ring of waving；
It waves transit joint (22), one end is spirally connected with the set (19) of waving；
It waves pressurized strut (23), one end is connect with the other end for waving transit joint (22).
10. fatigue experimental device according to claim 9, which is characterized in that the force loading device of waving further includes having
Load support (24) is waved, is fixed on the test platform (7), wave pressurized strut (23) were waved far from described
One end of connector (22) is crossed to wave load support (24) with described and connect.
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| CN201811340591.1A CN109506912A (en) | 2018-11-12 | 2018-11-12 | A kind of unmanned helicopter main hub center piece fatigue experimental device |
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| CN201811340591.1A CN109506912A (en) | 2018-11-12 | 2018-11-12 | A kind of unmanned helicopter main hub center piece fatigue experimental device |
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| CN110641734A (en) * | 2019-09-29 | 2020-01-03 | 中国直升机设计研究所 | Main oar central part waves pendulum loading device |
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| CN110758768A (en) * | 2019-10-15 | 2020-02-07 | 中国直升机设计研究所 | Loading device for stiffness test of flexible beam of bearingless rotor wing |
| CN110789733A (en) * | 2019-10-11 | 2020-02-14 | 中国直升机设计研究所 | Method for evaluating fatigue life of flapping deformation section of tail rotor flexible beam of helicopter |
| CN112357114A (en) * | 2020-11-20 | 2021-02-12 | 昌河飞机工业（集团）有限责任公司 | Fatigue test platform for main hub of helicopter |
| CN115420479A (en) * | 2021-05-31 | 2022-12-02 | 惠阳航空螺旋桨有限责任公司 | Propeller blade fatigue test device |
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| CN110641734A (en) * | 2019-09-29 | 2020-01-03 | 中国直升机设计研究所 | Main oar central part waves pendulum loading device |
| CN110641735A (en) * | 2019-09-29 | 2020-01-03 | 中国直升机设计研究所 | Fatigue test loading device for tail rotor hub journal shaft sleeve assembly |
| CN110789733A (en) * | 2019-10-11 | 2020-02-14 | 中国直升机设计研究所 | Method for evaluating fatigue life of flapping deformation section of tail rotor flexible beam of helicopter |
| CN110789733B (en) * | 2019-10-11 | 2022-04-12 | 中国直升机设计研究所 | Method for evaluating fatigue life of flapping deformation section of tail rotor flexible beam of helicopter |
| CN110758768A (en) * | 2019-10-15 | 2020-02-07 | 中国直升机设计研究所 | Loading device for stiffness test of flexible beam of bearingless rotor wing |
| CN112357114A (en) * | 2020-11-20 | 2021-02-12 | 昌河飞机工业（集团）有限责任公司 | Fatigue test platform for main hub of helicopter |
| CN115420479A (en) * | 2021-05-31 | 2022-12-02 | 惠阳航空螺旋桨有限责任公司 | Propeller blade fatigue test device |
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