CN1233995C - Method for simulating sea waves by using barrel-type centrifugal machine and apparatus therefor - Google Patents

Method for simulating sea waves by using barrel-type centrifugal machine and apparatus therefor Download PDF

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CN1233995C
CN1233995C CN 03148718 CN03148718A CN1233995C CN 1233995 C CN1233995 C CN 1233995C CN 03148718 CN03148718 CN 03148718 CN 03148718 A CN03148718 A CN 03148718A CN 1233995 C CN1233995 C CN 1233995C
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drum type
wave
drum
type groove
extractor
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CN1566916A (en
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高福平
吴应湘
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Institute of Mechanics of CAS
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Institute of Mechanics of CAS
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Abstract

The present invention relates to a method and a device thereof for simulating sea waves by a drum-shaped centrifuge. After the drum-shaped centrifuge is started to achieve specified centrifugal acceleration, water flows into a drum-shaped groove by using the water inflowing system of the drum-shaped centrifuge. A wave generator fixed on the inner wall of the drum-shaped groove is started to generate traveling waves, and wave damping is implemented by a wave absorber fixed to the other end of the inner wall of the drum-shaped groove. The device comprises a drum-shaped centrifuge and a wave generator and is characterized in that the wave generator is arranged in the drum-shaped groove of the drum-shaped centrifuge. The outer diameter of the drum-shaped groove is from 1 to 3 meters, the radial depth of the drum-shaped groove is from 20 to 50 centimeters, and the axial width of the drum-shaped groove is from 20 to 40 centimeters. The wave generator comprises a servo motor and a crank rocking plate mechanism, wherein the crank rocking plate mechanism is composed of a crank wheel, a connecting rod and a rocking plate; the servo motor is fixed to the side wall of the drum-shaped groove by a connecting block. The servo motor adopts closed-loop control, the wave absorber is arranged on the side wall of the drum-shaped groove adjacent to the rocking plate, and a partition plate is arranged in the middle part of the wave absorber.

Description

Method and device thereof with drum type centrifuge modelling wave
Technical field
The present invention relates to the simulation sea wave technology in Yu Haiyang Geotechnical Engineering, offshore structure engineering and the hydraulic engineering particularly a kind of method and device thereof with drum type centrifuge modelling wave.
Background technology
The ultimate principle of centrifuge modelling technology is the prototype material to be dwindled N according to geometrical similarity principle doubly prepare model, and places the centrifugal force field of the N times of acceleration of gravity that hydro-extractor produces to test, and makes model reach the stress state identical with prototype.Utilize this technology, can be under the prototype stress state observational study problems such as Geotechnical Engineering relevant with gravity, particularly can be used for destruction destabilization problems in the research engineering, this is difficult to accomplish to prototype.
Geotechnique's centrifuge modelling technology successfully is used to study Important Project problems such as landslide, seimic liquefaction of soil mass.Along with developing rapidly of infrastructure constructions such as marine oil natural gas source excavation industry, port engineering, be built in the problems such as stability of coastal waters Offshore Structures thing under wave action such as ocean platform on the sea bed, submarine pipeline, more and more be subjected to the attention of engineering circle and academia, and the sea wave simulation technology in the hydro-extractor is the key of carrying out this type of research always.Geotechnical centrifuge has two kinds of forms at present: 1) beam type hydro-extractor, this type hydro-extractor are to produce the high centrifugal force field by beam arm rotation hanging basket; 2) drum type hydro-extractor, this type hydro-extractor mainly are made up of drum type groove and central control board and appurtenances thereof, and wherein the drum type groove produces the high centrifugal force field when high speed rotating, and central control board both can rotate synchronously with the drum type groove, again relative motion can be arranged.
The design of existing Wave generating apparatus is based on beam type hydro-extractor, for example, the applicant's the patent No. is that the utility model patent " centrifuge modelling Wave generating apparatus " of ZL00205689.5 is exactly at the device based on the simulation wave of " beam type geotechnical centrifuge ", utilize this device can in beam type hydro-extractor, produce the wave of advancing of specific wavelength, but the structure of beam type hydro-extractor makes wave simulation be under many restrictions, its main deficiency has: the little characteristics of (1) beam type centrifugal basket size, limited the simulation context of wave parameter; (2) the grating type wave breaker of being taked only has wave dissipation effect preferably to the wave of particular range wavelength (being 4 times that wavelength is about grid and end wall distance); (3) the integral type design constraint of beam type hydro-extractor the test operability.
Summary of the invention
The objective of the invention is to: deficiencies such as the simulation wave parameter area that overcomes existing beam type hydro-extractor Wave generating apparatus is little, test poor operability, thus a kind of method and device thereof with drum type centrifuge modelling wave is provided.
The object of the present invention is achieved like this: the present invention is a kind of method with drum type centrifuge modelling wave, after this method starts the centrifugal acceleration that reaches given at the drum type hydro-extractor, utilize the water inlet system of drum type hydro-extractor that water is flowed in the drum type groove, when reaching predetermined depth deeply, the drum type trough inner water stops into water, start the wave making machine that is fixed on the drum type groove inwall and produce the wave of advancing, and carry out wave absorption by the wave breaker that is fixed on the drum type groove inwall other end and handle.
After starting the centrifugal acceleration reach given at the drum type hydro-extractor, at first the sand in the sand sample funnel is spilt and in the drum type groove, be prepared into half the soil layer of a layer thickness, in order to the simulation sea bed less than the drum type groove depth by the sand conduit; Utilize the water inlet system of drum type hydro-extractor that the water inlet of water from the drum type trench bottom slowly infiltrated the soil layer for preparing in the drum type groove again, the air of discharging soil layer inside makes soil layer saturated; Then, when the drum type trough inner water reaches predetermined depth deeply, stop into water, start the wave making machine that is fixed on the drum type groove inwall and produce the wave of advancing, and carry out wave absorption by the wave breaker that is fixed on the drum type groove inwall other end and handle.
Described predetermined depth is less than 3/4 of the drum type groove depth.
The bottom of described sand conduit is installed on the jacking gear that is positioned on the drum type hydro-extractor central control board, rotates with central control board, and does axially-movable with jacking gear along the drum type groove.
Central control board drives by second servomotor, and by producing relative rotation between a clutch speed variator and the drum type groove; The lower part outlet of sand conduit both can be along with central control board have rotated together, again can be reciprocating along the drum type fluted shaft to Width with the jacking gear on the central control board, to prepare uniform soil sample; Wave maker adopts the mode of closed-loop control accurately to control wave frequencies, and the wave height of the wave that produces can be regulated by changing crank length.
A kind of isolated plant with drum type centrifuge modelling wave, this device comprises drum type hydro-extractor and wave maker; The drum type hydro-extractor is fixed on the pit shaft type basis, form by drum type groove and central control board, wave maker is made up of wave making machine and wave breaker, it is characterized in that, wave maker is installed in the drum type groove of drum type hydro-extractor, this drum type groove and central control board are driven by separately servomotor respectively, also are provided with clutch speed variator between the two; Described wave making machine comprises that a servomotor is fixed on the drum type groove sidewall by a contiguous block, this servomotor adopts closed-loop control, rocker is installed on the base plate of drum type hydro-extractor drum type groove by hinged mode, crankwheel is installed on the main shaft of servomotor, and be connected with an end of connecting link with bearing by coupling shaft, the other end of connecting link is connected the rocker upper end by hinge with bolt and bearing pin, described wave breaker is arranged near on the drum type groove sidewall of rocker, and a dividing plate is set in the middle.
Described isolated plant with drum type centrifuge modelling wave, also comprise a sand sample preparation facilities, the sand sample funnel of this sand sample preparation facilities is installed on the protective cover of drum type hydro-extractor by steering knuckle, the top of sand conduit is connected with the sand sample funnel bottom, and the bottom is installed on the jacking gear that is positioned on the drum type hydro-extractor central control board.
The Luo hole that described crankwheel is distributing and is being positioned at different radii more than two changes crank length by regulating position, different hole, thereby changes the pivot angle of rocker, to produce the wave of different wave height.
Also be fixed with a laser displacement sensor on the described drum type groove inwall, be used to monitor the motion of rocker.
On the described drum type groove inwall wave-height gauge is installed also, is used to measure the wave height of the wave that produces.
The lower end of described sand conduit is installed on the jacking gear that is positioned on the central control board, can be along the axially-movable of drum type groove.
The servomotor outside of described wave making machine is provided with protective cover, plays fixed motor and waterproof effect, to avoid the influence of wet environment to motor circuit.
Described wave breaker is made by netted corrosion resistant plate, is the ramp shaped of symmetry, lays cellular fabric above.
The motor of described drum type groove and the motor of central control board adopt servomotor simultaneously.
The external diameter of described drum type groove is that 1-3 rice, radial depth are that 20-50 centimetre, axial width are 20-40 centimetre.
The invention has the advantages that: the present invention's method and device thereof of drum type centrifuge modelling wave, the drum type groove circumferential length that utilizes the drum type hydro-extractor is than the big advantage of beam type hydro-extractor box hanging basket length, and adopt the crank rocker of closed-loop control to make wave method, can produce the wave of advancing that frequency range is wide and frequency can accurately be controlled; And the wave dissipation effect of wave breaker is not subjected to the frequency or the wavelength of the wave that produces to limit, and reaches better wave dissipation effect; Simultaneously, because the separate design of the central control board of drum type hydro-extractor and drum type groove makes the preparation of soil sample and rough-water test be convenient to operation more.
Purpose of the present invention, feature and advantage will be illustrated in conjunction with the accompanying drawings by preferred embodiment.
The drawing explanation
Fig. 1 is the structural representation of the present invention with a device of drum type centrifuge modelling wave
Fig. 2 is the structural representation of the present invention with the another device of drum type centrifuge modelling wave
Fig. 3 is that drum type groove among Fig. 1 is along the sectional view of A-A line
Fig. 4 is the sectional view of Fig. 3 along the B-B line
Fig. 5 is the local enlarged diagram of the present invention with crank rocker mechanism in the drum type centrifuge modelling wave device
Accompanying drawing indicates
Sand sample funnel 1 steering knuckle 2 air-pressure ducts 3
Protective cover 4 sand conduits 5 drum type grooves 6
Central control board 7 jacking gears 8 central control board supporting plates 9
Axle 12 in the drum type groove saddle 10 digital collection computing machines 11
Outer shaft 13 first slip rings 14 first servomotors 15
Clutch speed variator 16 second servomotors 17 second slip rings 18
Wave breaker 19 dividing plates 20 crankwheels 21
Connecting link 22 rockers 23 laser displacement sensors 24
Drum type trough floor 25 wave-height gauges 26 drum type groove sidewalls 27
Contiguous block 28 the 3rd servomotor 29 motor protection covers 30
Coupling shaft 31 bearings 32 hinges bolt 33
Bearing pin 34 flute profile contiguous blocks 35
Embodiment
With reference to accompanying drawing, will be described in detail specific embodiments of the present invention.
Embodiment 1
Make an isolated plant of implementing with drum type centrifuge modelling wave method, shown in accompanying drawing 1,3,4,5.This device is made up of drum type hydro-extractor, wave maker two large divisions.
As accompanying drawing 1 and shown in Figure 3, the drum type hydro-extractor comprises: protective cover 4, be positioned at the drum type groove 6 of protective cover 4, be positioned at the central control board 7 of drum type groove 6, jacking gear 8 on the central control board 7, central control board supporting plate 9, drum type groove saddle 10, be installed in the digital collection computing machine 11 of drum type groove saddle 10 bottoms, the interior axle 12 that links to each other with central control board supporting plate 9, the outer shaft 13 that links to each other with drum type groove saddle 10, be used to drive first servomotor 15 of outer shaft 13, second servomotor 17 of axle 12 in being used to drive, between interior axle 12 and the outer shaft 13 clutch speed variator 16 is set also, be installed in first slip ring 14 and second slip ring 18 that is installed on the interior axle 12 on the outer shaft 13.The interior ring of first slip ring 14 is connected with the 3rd servomotor 29 with digital collection computing machine 11 respectively with lead by the data transfer line that is arranged on the outer shaft 13, and the interior ring of second slip ring 18 is connected with monitoring camera on the central control board 7 by the lead on the axle 12 in being arranged in; First slip ring 14 and both outer shrouds of second slip ring 18 then are connected with electric power supply device, computer control system in the Ground Control chamber respectively.
As Fig. 3,4, shown in 5, this wave maker is made up of the wave making machine and the wave breaker 19 that are installed in the hydro-extractor drum type groove, wave making machine comprises the 3rd servomotor 29, the 3rd servomotor 29 carries out waterproofing design by motor protection cover 30, and be fixed in by contiguous block 28 on the sidewall of drum type groove 6, be fixed with crankwheel 21 on the 3rd servomotor 29 main shafts, a plurality of Luo hole is set in the different radii position on the crankwheel 21, one end of connecting link 22 passes bearing 32 inner rings on the connecting link, be connected by the Luo hole of coupling shaft 31 with crankwheel 21 different radii places, the other end be connected the upper end of rocker 23 by hinge with bolt 33 and bearing pin 34, rocker 23 is installed on the base plate of drum type hydro-extractor drum type groove 6 by hinged mode; The ramp shaped that is symmetry that described wave breaker 19 is made by netted corrosion resistant plate also is equipped with cellular fabric on it, be arranged near on the drum type groove sidewall of rocker, at the middle part of wave breaker 19 dividing plate 20 is set also.
In this example, also be fixed with a laser displacement sensor 24 and a wave-height gauge 26 on drum type groove 6 inwalls, laser displacement sensor 24 is used to monitor the motion of rocker 23, and wave-height gauge 26 is used to measure the wave height of the wave that produces.
On this device, the inventive method is to implement like this:
(1) generation of high centrifugal force field
Under the driving of second servomotor 17, drum type groove 6 produces rotation.Under different rotating speed V, different radii r place will produce corresponding centrifugal acceleration a (a=V in the drum type groove 2/ r).
(2) make the wave system system
Open the water inlet on the drum type trough floor sidewall 27, water is flowed in the drum type groove 6 with fast speeds, reach the predetermined depth of water.The mode that adopts the 3rd servomotor 29 to drive crank rocker mechanism is made ripple, and the laser displacement sensor 24 that is fixed on drum type cell wall 27 that moves through of rocker is monitored.Crank rocker mechanism mainly is made up of crankwheel 21, connecting link 22 and rocker 23.The periodic motion of rocker 23 all can produce wave in its both sides.The location arrangements wave breaker 19 of taking back on the opposite of rocker 23 is to absorb the energy of both sides incoming wave.The right side of rocker 23 is available test section, and this section is desirable longer, to make full use of the circumferential length of drum type groove.Wave breaker 19 is designed to the ramp shaped of symmetry, and the dividing plate 20 of its center arrangement, interferes with each other to reduce the both sides wave.The wave dissipation effect of this type of wave suppression arrangement is not come the influence of wave frequency or wavelength.
After rough-water test finished, water was discharged drum type groove 6 by unwatering system, took out soil sample again after hydro-extractor shuts down by the time.
Embodiment 2
Make an isolated plant of implementing with drum type centrifuge modelling wave method, shown in accompanying drawing 2,3,4,5.This device is made up of drum type hydro-extractor, wave maker and sand sample preparation facilities three parts.
As shown in Figure 2, sand sample funnel 1 is fixed on the drum type hydro-extractor protective cover by steering knuckle 2, sand conduit 5 is communicated with through air-pressure duct 3 and sand sample funnel 1, sand under compressed-air actuated effect in the sand conduit 5 is more convenient for flowing in the hydro-extractor drum type groove 6, the lower part outlet of sand conduit 5 is installed on the jacking gear 8 that is positioned on the drum type hydro-extractor central control board 7, the lower part outlet of sand conduit 5 both can be along with central control board 7 rotates together, again can be reciprocating along the axial width of drum type groove 6 with the jacking gear on the central control board 78, to prepare uniform soil sample.
As shown in Figures 2 and 3, the drum type hydro-extractor comprises: the drum type groove 6 that is positioned at protective cover 4, be positioned at the central control board 7 of drum type groove 6, jacking gear 8 on the central control board 7, central control board supporting plate 9, drum type groove saddle 10, be installed in the digital collection computing machine 11 of drum type groove saddle 10 bottoms, the interior axle 12 that links to each other with central control board supporting plate 9, the outer shaft 13 that links to each other with drum type groove saddle 10, be used to drive first servomotor 15 of outer shaft 13, second servomotor 17 of axle 12 in being used to drive, between interior axle 12 and the outer shaft 13 clutch speed variator 16 is set also, be installed in first slip ring 14 and second slip ring 18 that is installed on the interior axle 12 on the outer shaft 13.The interior ring of first slip ring 14 is connected with the 3rd servomotor 29 equal power devices with digital collection computing machine 11 respectively with lead by the data transfer line that is arranged on the outer shaft 13, and the interior ring of second slip ring 18 is connected with jacking gear 8 and the first-class electric device of monitoring camera on the central control board 7 by the lead on the axle 12 in being arranged in; First slip ring 14 and both outer shrouds of second slip ring 18 then are connected with electric power supply device, computer control system in the Ground Control chamber respectively.
As Fig. 3,4, shown in 5, this wave maker is made up of the wave making machine and the wave breaker 19 that are installed in the hydro-extractor drum type groove, wave making machine comprises the 3rd servomotor 29, the 3rd servomotor 29 carries out waterproofing design by motor protection cover 30, and be fixed in by contiguous block 28 on the sidewall of drum type groove 6, be fixed with crankwheel 21 on the 3rd servomotor 29 main shafts, a plurality of Luo hole is set in the different radii position on the crankwheel 21, one end of connecting link 22 passes bearing 32 inner rings on the connecting link, be connected by the Luo hole of coupling shaft 31 with crankwheel 21 different radii places, the other end with by hinge with bolt 33, bearing pin 34 and flute profile contiguous block 35 are connected the upper end of rocker 23, and rocker 23 is installed on the base plate of drum type hydro-extractor drum type groove 6 by hinged mode; The ramp shaped that is symmetry that described wave breaker 19 is made by netted corrosion resistant plate also is equipped with cellular fabric on it, be arranged near on the drum type groove sidewall of rocker, at the middle part of wave breaker 19 dividing plate 20 is set also.
In this example, also be fixed with a laser displacement sensor 24 and a wave-height gauge 26 on drum type groove 6 inwalls, laser displacement sensor 24 is used to monitor the motion of rocker 23, and wave-height gauge 26 is used to measure the wave height of the wave that produces.
On this device, the inventive method is to implement like this:
(1) generation of high centrifugal force field
Under the driving of second servomotor 17, drum type groove 6 produces rotation.Under different rotating speed V, different radii r place will produce corresponding centrifugal acceleration a (a=V in the drum type groove 2/ r).
(2) preparation of simulation sea bed soil sample
Under given centrifugal acceleration, be positioned over sand in the sand sample funnel 1 under the booster action of air-pressure duct 3 compressed airs, the sand conduit 5 of flowing through enters in the drum type groove 6; Sand conduit 5 is installed on the sand conduit jacking gear 8 that is positioned on the central control board 7, makes that sand conduit 5 can be along the drum type fluted shaft to reciprocating.Drive by second servomotor 17 with interior axle 12 central control boards that are connected, drum type groove saddle that is connected with outer shaft 13 and drum type groove placed on it then can drive by first servomotor 15.By clutch speed variator 16, can produce relative motion between central control board 7 and the drum type groove 6.Like this, sand conduit lower end can be simultaneously along the drum type fluted shaft to doing reciprocal curvilinear motion with hoop, prepare certain thickness soil layer, in order to the simulation sea bed.
In addition, all be furnished with into water and unwatering system at the drum type trough floor 25 and the sidewall 27 of drum type hydro-extractor.After the soil layer preparation was finished, water can slowly flow into from the water inlet of drum type trough floor, and the air of discharging sand inside makes the saturated attention simultaneously of sand avoid current to wash out soil layer construction.After utilizing camera on the central control board to find that water oozes out the sand surface, stop water inlet water inlet from the drum type trough floor.
(3) make the wave system system
Open the water inlet on the drum type trough floor sidewall 27, water is flowed in the drum type groove 6 with fast speeds, reach the predetermined depth of water.The mode that adopts the 3rd servomotor 29 to drive crank rocker mechanism is made ripple, and the laser displacement sensor 24 that is fixed on drum type cell wall 27 that moves through of rocker is monitored.Crank rocker mechanism mainly is made up of crankwheel 21, connecting link 22 and rocker 23.The periodic motion of rocker 23 all can produce wave in its both sides.The location arrangements wave breaker 19 of taking back on the opposite of rocker 23 is to absorb the energy of both sides incoming wave.The right side of rocker 23 is available test section, and this section is desirable longer, to make full use of the circumferential length of drum type groove.Wave breaker 19 is designed to the ramp shaped of symmetry, and the dividing plate 20 of its center arrangement, interferes with each other to reduce the both sides wave.The wave dissipation effect of this type of wave suppression arrangement is not come the influence of wave frequency or wavelength.
After rough-water test finished, water was discharged drum type groove 6 by unwatering system, took out soil sample again after hydro-extractor shuts down by the time.

Claims (13)

1, a kind of method with drum type centrifuge modelling wave, it is characterized in that, after starting the centrifugal acceleration reach given at the drum type hydro-extractor, utilize the water inlet system of drum type hydro-extractor that water is flowed in the drum type groove, when reaching predetermined depth deeply, the drum type trough inner water stops into water, start the wave making machine that is fixed on the drum type groove inwall and produce the wave of advancing, and carry out wave absorption by the wave breaker that is fixed on the drum type groove inwall other end and handle.
2, by the described method of claim 1 with drum type centrifuge modelling wave, it is characterized in that, after starting the centrifugal acceleration reach given at the drum type hydro-extractor, at first the sand in the sand sample funnel is spilt and in the drum type groove, be prepared into half the soil layer of a layer thickness, in order to the simulation sea bed less than the drum type groove depth by the sand conduit; Utilize the water inlet system of drum type hydro-extractor that the water inlet of water from the drum type trench bottom slowly infiltrated the soil layer for preparing in the drum type groove again, the air of discharging soil layer inside makes soil layer saturated.
3, by claim 1 or 2 described methods, it is characterized in that described predetermined depth is less than 3/4 of the drum type groove depth with drum type centrifuge modelling wave.
4, by the described method of claim 2 with drum type centrifuge modelling wave, it is characterized in that, the bottom of described sand conduit is installed on the jacking gear that is positioned on the drum type hydro-extractor central control board, rotates with central control board, and does axially-movable with jacking gear along the drum type groove.
5, the described isolated plant of a kind of claim 1 with drum type centrifuge modelling wave method, this device comprises drum type hydro-extractor and wave maker; The drum type hydro-extractor is fixed on the pit shaft type basis, form by drum type groove and central control board, wave maker is made up of wave making machine and wave breaker, it is characterized in that, wave maker is installed in the drum type groove of drum type hydro-extractor, this drum type groove and central control board are driven by separately servomotor respectively, also are provided with clutch speed variator between the two; Described wave making machine comprises that a servomotor is fixed on the drum type groove sidewall by a contiguous block, this servomotor adopts closed-loop control, rocker is installed on the base plate of drum type hydro-extractor drum type groove by hinged mode, crankwheel is installed on the main shaft of servomotor, and be connected with an end of connecting link with bearing by coupling shaft, the other end of connecting link is connected the rocker upper end by hinge with bolt and bearing pin, described wave breaker is arranged near on the drum type groove sidewall of rocker, and a dividing plate is set in the middle.
6, by the described isolated plant of claim 5 with drum type centrifuge modelling wave, it is characterized in that, also comprise a sand sample preparation facilities, the sand sample funnel of this sand sample preparation facilities is installed on the protective cover of drum type hydro-extractor by steering knuckle, the top of sand conduit is connected with the sand sample funnel bottom, and the bottom is installed on the jacking gear that is positioned on the drum type hydro-extractor central control board.
7, by the described isolated plant of claim 5, it is characterized in that, also be distributed with the Luo hole that is positioned at the different radii place more than two on the described crankwheel with drum type centrifuge modelling wave.
8, by the described isolated plant of claim 5, it is characterized in that, also be fixed with a laser displacement sensor on the described drum type groove inwall with drum type centrifuge modelling wave.
9, by the described isolated plant of claim 5, it is characterized in that, on the described drum type groove inwall wave-height gauge is installed also with drum type centrifuge modelling wave.
By the described isolated plant of claim 5, it is characterized in that 10, the servomotor outside of described wave making machine is provided with protective cover with drum type centrifuge modelling wave.
11, by the described isolated plant of claim 5, it is characterized in that described wave breaker is made by netted corrosion resistant plate, be the ramp shaped of symmetry, lay cellular fabric above with drum type centrifuge modelling wave.
12, by the described isolated plant of claim 5, it is characterized in that the motor of described drum type groove and the motor of central control board adopt servomotor simultaneously with drum type centrifuge modelling wave.
13, by each the described isolated plant in the claim 5,6,7,8,9,10,11 or 12 with drum type centrifuge modelling wave, it is characterized in that the external diameter of described drum type groove is that 1-3 rice, radial depth are that 20-50 centimetre, axial width are 20-40 centimetre.
CN 03148718 2003-06-24 2003-06-24 Method for simulating sea waves by using barrel-type centrifugal machine and apparatus therefor Expired - Fee Related CN1233995C (en)

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