CN105444975A - Multifunctional drop hammer impact test device - Google Patents
Multifunctional drop hammer impact test device Download PDFInfo
- Publication number
- CN105444975A CN105444975A CN201510778743.6A CN201510778743A CN105444975A CN 105444975 A CN105444975 A CN 105444975A CN 201510778743 A CN201510778743 A CN 201510778743A CN 105444975 A CN105444975 A CN 105444975A
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- impact test
- hammer
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- 238000009863 impact test Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- 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
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a multifunctional drop hammer impact test device comprising a bottom plate, stand columns and guide columns mounted on the bottom plate, connecting beams connected between the stand columns, upper connecting plates connecting the stand columns and the guide columns, a moving crossbeam and a drop hammer assembly mounted on the guide columns, a tire mounting rack, a main tire and a depended wheel mounted on the tire mounting rack, a polyhedral roller device, a secondary impact preventing device, a lifting device, an electrical control cabinet, a data collector, and a computer, wherein the bottom plate, the stand columns, the connecting beams and the upper connecting plates form an overall frame structure, the tire mounting rack is fastened to the bottom plate by screws, and the two ends of the guide columns are respectively connected to the tire mounting rack and the upper connecting plates. Different impact rates are achieved through height control, the impact energy is controlled by counterbalance weights, the situation in which a carrier-borne aircraft impacts the runway when landing is simulated truly under the condition of less space occupation, and the mechanical performance parameters when the aircraft wheels and the arresting hook impact the runway can be measured.
Description
Technical field
The present invention relates to a kind of testing apparatus technical field, particularly relate to a kind of multi-functional falling weight impact test device, can be used for the mechanical property parameters of testing airplane wheel and arrester hook shock simulation runway.
Background technology
At present, not yet occur and can simulate ship-board aircraft landing and the runway coating on naval vessel be had to the simulated testing system of percussive action; In prior art, domestic and international majority of case is all carry out research process respectively to undercarriage and arrester hook.And if the external U.S., the drop test facility that its aircraft drop test facility used is the movable ground of band, activity is driven, this facility mainly contains propellings, slides carriage, and braking three digest journals forms, and space hold is very large; Landing gear drop test domestic at present mainly carries out on column testing table, can not simultaneously simulated aircraft wheel and the arrester hook situation of runway of simultaneously impacting.
In order to when can simulate ship-board aircraft landing, wheel and arrester hook solve every mechanical property testing problem to the percussive action of runway, be necessary to develop research in fact, to provide a kind of scheme, can be used for recording every mechanical property parameters when simulation runway is hit.
Summary of the invention
The object of this creation embodiment is to provide a kind of multi-functional falling weight impact test device, for the mechanical property parameters of testing airplane wheel and arrester hook shock simulation runway.
For achieving the above object, technical scheme of the present invention is:
A kind of multi-functional falling weight impact test device, the upper junction plate of include base plate, be installed on column on base plate and guide pillar, be connected to tie-beam between column, connect column and guide pillar, is installed on the moving beam on guide pillar and the assembly that drops hammer, tire erecting frame, is installed on main tire on tire erecting frame and roller, polyhedron roller devices, anti-secondary pulse device, lifting gear, electrical control cabinet and data acquisition unit and computing machine; Wherein, base plate, column, tie-beam, upper junction plate form overall mount structure; Tire erecting frame screw fastening is placed on base plate, and guide pillar two ends are connected on tire erecting frame and upper chain connecting plate; The assembly that drops hammer is movably connected between a pair guide pillar by guide roller, can slide up and down along guide pillar.
Further, the assembly that drops hammer described in includes main body of dropping hammer, platform device for force measurement, arrester hook and balancing weight.
Further, described platform device for force measurement is fixed in immediately below main body of dropping hammer, can measure the impulsive force of vertical direction and the friction force of horizontal direction by sensor, and balancing weight is placed on above main body of dropping hammer, arrester hook is by being connected to the side of main body of dropping hammer with the bearing seat of ratchet.
Further, described moving beam is positioned at the top of the assembly that drops hammer, and can realize the seizure to the assembly that drops hammer and release, be connected above described moving beam with wire rope under the cooperation of cylinder, realizes the lifting to the assembly that drops hammer under the control of lifting gear.
Further, described main tire to be placed on tire erecting frame and to be in immediately below the assembly that drops hammer; Roller is placed on the downside of main tire, can be driven the rotation of main tire by the rotation of roller.
Further, described platform device for force measurement and arrester hook are all equipped with force cell, described sensor is connected with data acquisition unit, and data acquisition unit is connected with computing machine; The action being controlled motor and cylinder by the operation of electrical control cabinet human-computer interaction interface is controlled.
Compared to prior art, the present invention's multi-functional falling weight impact test device is by controlling highly to realize different impact speeds, impact energy is controlled by weights, the situation of runway is impacted when simulating ship-board aircraft landing more really when taking up room less, and every mechanical property parameters when can record airplane wheel and arrester hook impact runway, for the research of aircraft carrier runway coating performance provides reference.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, to those skilled in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the three-dimensional view of the multi-functional falling weight impact test device of the present invention.
Fig. 2 is the cut-open view of the multi-functional falling weight impact test device of the present invention.
Fig. 3 is modular construction schematic front view of dropping hammer in the multi-functional falling weight impact test device of the present invention.
Fig. 4 is modular construction schematic isometric of dropping hammer in the multi-functional falling weight impact test device of the present invention.
Embodiment
The present invention is by controlling highly to realize different impact speeds, impact energy is controlled by weights, the situation of runway is impacted when simulating ship-board aircraft landing more really when taking up room less, and every mechanical property parameters when can record airplane wheel and arrester hook impact runway.
For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, the embodiments described below are only the present invention's part embodiments, and not all embodiments.Based on the embodiment in the present invention, the every other embodiment that those skilled in the art obtains, all belongs to the scope of protection of the invention.
In describing the invention, it will be appreciated that, term " on ", D score, "front", "rear", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, connect integratedly, also can be removably connect; It can be the connection of two element internals; Can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, concrete condition can understand above-mentioned term concrete meaning in the present invention.
Please refer to shown in Fig. 1, Fig. 2, present disclosure provides a kind of multi-functional falling weight impact test device, include base plate 1, be installed on four root posts 5 on base plate and guide pillar 14, be connected to tie-beam 8 between column 5, connect column and guide pillar upper junction plate 7, be installed on moving beam 9 on guide pillar 14 and the assembly 10 that drops hammer, tire erecting frame 3, be installed on main tire 4 on tire erecting frame 3 and roller 2, polyhedron roller devices 12, anti-secondary pulse device 11, lifting gear 13, electrical control cabinet and data acquisition unit and computing machine.Wherein, base plate 1, column 5, tie-beam 8, upper junction plate 7 form overall mount structure; Tire erecting frame 3 screw fastening is placed on base plate 1, and guide pillar 5 two ends are connected on tire erecting frame 3 and upper chain connecting plate 7; The assembly 10 that drops hammer is movably connected between a pair guide pillar 14 by guide roller 19, can slide up and down along guide pillar 14.
Please refer to shown in Fig. 3, Fig. 4, described in the assembly 10 that drops hammer include main body 17 of dropping hammer, platform device for force measurement 18, arrester hook 15 and balancing weight 16; Wherein, described platform device for force measurement 18 is fixed in immediately below main body 17 of dropping hammer, the impulsive force of vertical direction and the friction force of horizontal direction can be measured by sensor, and balancing weight 16 is placed on above main body of dropping hammer, arrester hook 15 is by being connected to the side of main body 17 of dropping hammer with the bearing seat of ratchet; Moving beam 9 is positioned at the top of the assembly 10 that drops hammer, and can realize the seizure to the assembly 10 that drops hammer and release under the cooperation of cylinder, is connected above described moving beam 9 with wire rope, realizes the lifting to the assembly 10 that drops hammer under the control of lifting gear 13; Main tire 4 to be placed on tire erecting frame 3 and to be in immediately below the assembly 10 that drops hammer; Roller 2 is placed on the downside of main tire 4, can be driven the rotation of main tire 4 by the rotation of roller 2; Tire erecting frame 3 both sides are also provided with anti-secondary pulse device 11, realize the seizure of falling for 10 2 times to the assembly that drops hammer; Polyhedron roller devices 12 is placed on the side of tire erecting frame 3, directly and ground fastening, be positioned at immediately below arrester hook, be used for bearing the impact of arrester hook 15 gib head; Lifting gear 13 is positioned at the opposite side of tire erecting frame 3, and described lifting gear is made up of reducing motor and cable drum, and wire rope is connected with moving beam 9 by the fixed pulley 6 on frame top; Platform device for force measurement 18 and arrester hook 15 are all equipped with force cell, and described sensor is connected with data acquisition unit, and data acquisition unit is connected with computing machine; The control of action realization to whole process of the test of motor and cylinder is controlled by the operation of electrical control cabinet human-computer interaction interface.
Process of the test step of the present invention is as follows:
1. install according to testing requirements and debugged drop hammer impact testing machine and relevant device;
2. set parameter by electrical control cabinet human-computer interaction interface;
3. make main tire and polyhedron roller operate by the speed of setting in step 2, and by drop hammer lifting to corresponding height;
4. turn-on data collector;
5. discharge the assembly that drops hammer, and preserve the data collected, the assembly that drops hammer is caught by anti-secondary pulse device after upspringing;
6. reset parameter or increase and decrease balancing weight, carry out revision test;
7. callback data analyzing.
The present invention is by controlling highly to realize different impact speeds, impact energy is controlled by weights, the situation of runway is impacted when simulating ship-board aircraft landing more really when taking up room less, and every mechanical property parameters when can record airplane wheel and arrester hook impact runway, for the research of aircraft carrier runway coating performance provides reference.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a multi-functional falling weight impact test device, is characterized in that: include base plate, the column be installed on base plate, guide pillar, be connected to tie-beam between column, connect the upper junction plate of column and guide pillar, be installed on the moving beam on guide pillar and the assembly that drops hammer, tire erecting frame, be installed on main tire on tire erecting frame and roller, polyhedron roller devices, anti-secondary pulse device, lifting gear, electrical control cabinet and data acquisition unit and computing machine; Wherein, base plate, column, tie-beam, upper junction plate form overall mount structure; Tire erecting frame screw fastening is placed on base plate, and guide pillar two ends are connected on tire erecting frame and upper chain connecting plate; The assembly that drops hammer is movably connected between a pair guide pillar by guide roller, can slide up and down along guide pillar.
2. a kind of multi-functional falling weight impact test device as claimed in claim 1, is characterized in that: described in the assembly that drops hammer include main body of dropping hammer, platform device for force measurement, arrester hook and balancing weight.
3. a kind of multi-functional falling weight impact test device as claimed in claim 2, it is characterized in that: described platform device for force measurement is fixed in immediately below main body of dropping hammer, the impulsive force of vertical direction and the friction force of horizontal direction can be measured by sensor, and balancing weight is placed on above main body of dropping hammer, arrester hook is by being connected to the side of main body of dropping hammer with the bearing seat of ratchet.
4. a kind of multi-functional falling weight impact test device as claimed in claim 3, it is characterized in that: described moving beam is positioned at the top of the assembly that drops hammer, the seizure to the assembly that drops hammer and release can be realized under the cooperation of cylinder, be connected with wire rope above described moving beam, under the control of lifting gear, realize the lifting to the assembly that drops hammer.
5. a kind of multi-functional falling weight impact test device as claimed in claim 4, is characterized in that: described main tire to be placed on tire erecting frame and to be in immediately below the assembly that drops hammer; Roller is placed on the downside of main tire, can be driven the rotation of main tire by the rotation of roller.
6. a kind of multi-functional falling weight impact test device as claimed in claim 5, it is characterized in that: described platform device for force measurement and arrester hook are all equipped with force cell, described sensor is connected with data acquisition unit, and data acquisition unit is connected with computing machine; The action being controlled motor and cylinder by the operation of electrical control cabinet human-computer interaction interface is controlled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510778743.6A CN105444975B (en) | 2016-01-05 | 2016-01-05 | A kind of multi-functional falling weight impact test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510778743.6A CN105444975B (en) | 2016-01-05 | 2016-01-05 | A kind of multi-functional falling weight impact test device |
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| CN105444975A true CN105444975A (en) | 2016-03-30 |
| CN105444975B CN105444975B (en) | 2018-06-01 |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706450A (en) * | 2016-12-08 | 2017-05-24 | 武汉理工大学 | Combined drop hammer |
| CN107860668A (en) * | 2017-11-03 | 2018-03-30 | 无锡市福莱达石油机械有限公司 | Coating impact fatigue experimental provision |
| CN108645728A (en) * | 2016-07-05 | 2018-10-12 | 潘唯锡 | A kind of hoisting mechanism for testing the bending of vehicle hub alternation stress |
| CN108716977A (en) * | 2018-05-07 | 2018-10-30 | 中国飞机强度研究所 | A kind of flexibility pose adjustment position control device |
| CN108760264A (en) * | 2018-05-28 | 2018-11-06 | 南京航空航天大学 | A kind of arrester hook folding and unfolding buffering multi-function test stand and its test method |
| CN109374446A (en) * | 2018-09-29 | 2019-02-22 | 长安大学 | A kind of impact test apparatus |
| CN109506872A (en) * | 2018-09-29 | 2019-03-22 | 长安大学 | A kind of impact test apparatus and test method for pressing load function with self-balancing axis |
| CN109580258A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | A kind of dynamic mechanical test macro of tire |
| CN109991021A (en) * | 2017-12-29 | 2019-07-09 | 上汽通用五菱汽车股份有限公司 | A kind of multi-angle tire dynamic rate experimental rig |
| CN110057529A (en) * | 2019-05-21 | 2019-07-26 | 青岛科技大学 | A kind of wheel rim accelerating type tire impact test apparatus |
| CN110132616A (en) * | 2019-05-31 | 2019-08-16 | 梁徽耀 | Performance detection apparatus is worn in a kind of resistance of automobile tire |
| CN110864967A (en) * | 2019-10-24 | 2020-03-06 | 张玲 | Array type detection equipment for batch quality inspection of prefabricated parts of small building |
| CN111811341A (en) * | 2020-06-17 | 2020-10-23 | 江苏理工学院 | Crawler-type ammunition fuse impact test device |
| CN112924126A (en) * | 2021-01-20 | 2021-06-08 | 南京航空航天大学 | Aircraft tire landing impact test device and test method thereof |
| CN113188927A (en) * | 2021-03-25 | 2021-07-30 | 河海大学 | Impact power model test device and test method for buried pressure pipeline |
| CN115924121A (en) * | 2023-01-17 | 2023-04-07 | 哈尔滨工业大学 | Comprehensive loading test device and method for aircraft landing gear system in multi-motion state |
| CN117073957A (en) * | 2023-10-13 | 2023-11-17 | 中国飞机强度研究所 | Ship-borne aircraft load measurement and ship surface characteristic simulation device and method |
| CN117087873A (en) * | 2023-10-20 | 2023-11-21 | 中国飞机强度研究所 | Device and method for measuring collision load of carrier-based aircraft blocking hook landing |
| CN117087872A (en) * | 2023-10-19 | 2023-11-21 | 中国飞机强度研究所 | Buffer method and buffer system for dynamic response test of impact of blocking hook of carrier-based aircraft |
| CN117168748A (en) * | 2023-11-03 | 2023-12-05 | 中国飞机强度研究所 | Ship-borne aircraft arresting hook head abrasion test device and method |
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Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108645728A (en) * | 2016-07-05 | 2018-10-12 | 潘唯锡 | A kind of hoisting mechanism for testing the bending of vehicle hub alternation stress |
| CN106706450A (en) * | 2016-12-08 | 2017-05-24 | 武汉理工大学 | Combined drop hammer |
| CN107860668A (en) * | 2017-11-03 | 2018-03-30 | 无锡市福莱达石油机械有限公司 | Coating impact fatigue experimental provision |
| CN107860668B (en) * | 2017-11-03 | 2019-12-10 | 无锡市福莱达石油机械有限公司 | Coating impact fatigue experimental device |
| CN109991021B (en) * | 2017-12-29 | 2024-05-28 | 上汽通用五菱汽车股份有限公司 | Multi-angle tire dynamic stiffness test device |
| CN109991021A (en) * | 2017-12-29 | 2019-07-09 | 上汽通用五菱汽车股份有限公司 | A kind of multi-angle tire dynamic rate experimental rig |
| CN108716977A (en) * | 2018-05-07 | 2018-10-30 | 中国飞机强度研究所 | A kind of flexibility pose adjustment position control device |
| CN108760264B (en) * | 2018-05-28 | 2019-12-24 | 南京航空航天大学 | Comprehensive test bed for retraction and extension buffering of arresting hook and test method thereof |
| CN108760264A (en) * | 2018-05-28 | 2018-11-06 | 南京航空航天大学 | A kind of arrester hook folding and unfolding buffering multi-function test stand and its test method |
| CN109374446A (en) * | 2018-09-29 | 2019-02-22 | 长安大学 | A kind of impact test apparatus |
| CN109506872A (en) * | 2018-09-29 | 2019-03-22 | 长安大学 | A kind of impact test apparatus and test method for pressing load function with self-balancing axis |
| CN109506872B (en) * | 2018-09-29 | 2020-05-29 | 长安大学 | Impact test device with self-balancing axial pressure loading function and test method |
| CN109580258B (en) * | 2019-01-24 | 2020-11-13 | 中汽研（天津）汽车工程研究院有限公司 | Dynamic mechanical property testing system of tire |
| CN109580258A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | A kind of dynamic mechanical test macro of tire |
| CN110057529A (en) * | 2019-05-21 | 2019-07-26 | 青岛科技大学 | A kind of wheel rim accelerating type tire impact test apparatus |
| CN110132616A (en) * | 2019-05-31 | 2019-08-16 | 梁徽耀 | Performance detection apparatus is worn in a kind of resistance of automobile tire |
| CN110864967B (en) * | 2019-10-24 | 2022-07-12 | 内蒙古卓信建设工程检测有限公司 | Array type detection equipment for batch quality inspection of prefabricated parts of small building |
| CN110864967A (en) * | 2019-10-24 | 2020-03-06 | 张玲 | Array type detection equipment for batch quality inspection of prefabricated parts of small building |
| CN111811341A (en) * | 2020-06-17 | 2020-10-23 | 江苏理工学院 | Crawler-type ammunition fuse impact test device |
| CN112924126A (en) * | 2021-01-20 | 2021-06-08 | 南京航空航天大学 | Aircraft tire landing impact test device and test method thereof |
| CN113188927A (en) * | 2021-03-25 | 2021-07-30 | 河海大学 | Impact power model test device and test method for buried pressure pipeline |
| CN113188927B (en) * | 2021-03-25 | 2022-07-29 | 河海大学 | Buried pressure pipeline impact power model test device and test method |
| CN115924121A (en) * | 2023-01-17 | 2023-04-07 | 哈尔滨工业大学 | Comprehensive loading test device and method for aircraft landing gear system in multi-motion state |
| CN115924121B (en) * | 2023-01-17 | 2023-06-06 | 哈尔滨工业大学 | Comprehensive loading test device and method for aircraft landing gear system under multiple motion states |
| CN117073957A (en) * | 2023-10-13 | 2023-11-17 | 中国飞机强度研究所 | Ship-borne aircraft load measurement and ship surface characteristic simulation device and method |
| CN117073957B (en) * | 2023-10-13 | 2024-01-09 | 中国飞机强度研究所 | Ship-borne aircraft load measurement and ship surface characteristic simulation device and method |
| CN117087872A (en) * | 2023-10-19 | 2023-11-21 | 中国飞机强度研究所 | Buffer method and buffer system for dynamic response test of impact of blocking hook of carrier-based aircraft |
| CN117087872B (en) * | 2023-10-19 | 2024-01-05 | 中国飞机强度研究所 | Buffer method and buffer system for dynamic response test of impact of blocking hook of carrier-based aircraft |
| CN117087873A (en) * | 2023-10-20 | 2023-11-21 | 中国飞机强度研究所 | Device and method for measuring collision load of carrier-based aircraft blocking hook landing |
| CN117087873B (en) * | 2023-10-20 | 2024-01-05 | 中国飞机强度研究所 | Device and method for measuring collision load of carrier-based aircraft blocking hook landing |
| CN117168748A (en) * | 2023-11-03 | 2023-12-05 | 中国飞机强度研究所 | Ship-borne aircraft arresting hook head abrasion test device and method |
| CN117168748B (en) * | 2023-11-03 | 2024-01-05 | 中国飞机强度研究所 | Ship-borne aircraft arresting hook head abrasion test device and method |
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| CN105444975B (en) | 2018-06-01 |
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