CN109946479A - A kind of original position ADCP ratio surveys preventing seabed base construction method - Google Patents
A kind of original position ADCP ratio surveys preventing seabed base construction method Download PDFInfo
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Abstract
A kind of original position ADCP ratio surveys preventing seabed base construction method, comprising the following steps: clear ADCP is in situ than survey sea bed based structures design object；Determine sea bed based structures design constraint；Definition structure Parametric designing variable；Determine preventing seabed base radome fairing form；It determines the preventing seabed base instrument bin under constraint condition, recycle chamber structure；Determine the radome fairing numerical model under constraint condition and body structure of sitting crosslegged；Determine each structural member relative position of preventing seabed base under constraint condition.The present invention is according to ADCP measuring principle and fluid dynamics basic principle, can synchronize than surveying more ADCP, spatial optimization small to flow in situ as structure design object, it is theoretical using structural member Parameters Optimal Design, pass through the space structure layout designs optimization algorithm of procedure and parametrization, ADCP is constructed in situ than surveying preventing seabed base structural model, it realizes that there are laws to abide by than surveying the design of sea bed based structures, solves the problems, such as that ADCP can not be in situ than surveying.
Description
Technical field
The present invention relates to ocean monitoring technologytechnologies fields.
Background technique
Acoustic Doppler fluid velocity profile instrument (abbreviation ADCP) have do not disturb flow field, that test lasts the short, range that tests the speed is big
Feature, it has also become marine environmental monitoring multimeter at present.But since technical conditions are limited, the country is measured without ADCP
Certification authority, monitoring personnel are unable to judge accurately its monitoring data quality.
It is in situ than surveying between different ADCP, it is to examine the theoretical feasible mode of its performance indicator.And ADCP is compared
Test is tested, and the most important condition is that a good ratio is needed to survey platform.Compared with the observation platforms such as ship, buoy, subsurface buoy, sea bed
Base has the characteristics that stationarity, is influenced without relative motion, not by sea situation, is more suitable for carrying out ADCP in situ than surveying.It is domestic at present
The anti-absorption preventing seabed base of the self-balancing developed, the anti-silting seabed base of self-balancing and Multifunctional universal seabed base etc. are all
It is not the platform specifically for ADCP than survey for the marine monitoring platform of specific environment.Even if can be thrown by same sea area
It puts more preventing seabed bases and carries out ADCP simultaneous observation, but due to the difference of placement position, not can guarantee different apparatus measures is " same
One water body ", therefore effective ratio survey can not be carried out.
Summary of the invention
Aiming at the problem that current country ADCP can not carry out effective ratio in situ survey, the present invention is set according to structural member parameter optimization
Meter is theoretical, provides a kind of original position ADCP ratio and surveys preventing seabed base construction method.
Present invention technical solution used for the above purpose is: a kind of original position ADCP ratio surveys preventing seabed base building side
Method, comprising the following steps:
Step 1: clear ADCP is in situ than surveying sea bed based structures design object, comprising: can synchronize than surveying at least 2 ADCP；
It is more minimum to the flow in ADCP beam area than surveying preventing seabed base contour structures；Distance is minimum, extra large between each ADCP instrument bin
Bed base is small in size；There is versatility than surveying sea bed based structures；
Step 2: sea bed based structures design constraint is determined, comprising: when than surveying 45 ° of preventing seabed base maximum tilt angle
ADCP can be measured normally；The structure of instrument bin should make ADCP energy converter not be rectified cover to block, also do not expose radome fairing；Instrument
Device the top of the warehouse height should be consistent with radome fairing height；Floating ball storage capacity should can accommodate recycling rope and show a floating ball, and its
Top edge height should be consistent with radome fairing height；
Step 3: ADCP is defined in situ than surveying preventing seabed base structure parameterization design variable: 2 inclination angle alpha of disk pedestal, instrument
6 inclination angle beta of storehouse, 6 diameter D of instrument bin, 6 height h of instrument bin, 3 diameter R of recovery bin, 3 height L of recovery bin, recovery bin 3 is most
Distance mR of the distal end away from preventing seabed base center, when 6 plumbness of instrument bin between body 2 of sitting crosslegged distance, delta l, 7 width S 1 of bracket,
7 height S2 of bracket, instrument bin 6 is away from 3 most proximal end distance S3 of recovery bin, 10 height P of vertical baffle；
Step 4: the microcosmic flow field model in preventing seabed base periphery is established according to fluid dynamics basic principle, passes through different shape
Radome fairing simulation test compares analysis, determines that radome fairing shape is parabolical.
Step 5: preventing seabed base recovery bin and instrument bin supporting structure are determined.According to a floating buoyancy requirement is shown, by A Ji meter
Moral principle, which can determine, shows a floating ball diameter, and recovery bin diameter should be slightly bigger than floating ball diameter, and recovery bin height is taken as L=L1+
L2, L1 are recycling rope storehouse height, and L2 is float cabin height；When disk pedestal (2) horizontal tilt angle is α, the vertical inclination angle ADCP
When degree is β, equation is established according to constraint condition:Solving above-mentioned equation, can to obtain bracket wide
Spend the condition that should meet are as follows: S1 >=2h sin (alpha-beta)+D, in order to meet the requirement of preventing seabed base inner space optimization, herein
Take S1=2h sin (alpha-beta)+D；The constraint condition that instrument bin bracket (7) height meets is S2- △ l >=h cos (alpha-beta), equation
The vertical height of instrument bin when the right h cos (alpha-beta) is run-off the straight；It is optimal when above-mentioned equation is equation, at this time
Support height S2=h cos (alpha-beta)+△ l.
Step 6: the radome fairing functional equation under constraint condition, parabolical radome fairing fundamental equation are as follows: z=a (x are determined2
+y2)+b, a, b are coefficient, establish rectangular coordinate system in space, x, y, z is respectively the coordinate components of rectangular coordinate system, with preventing seabed base
Bottom center's point is coordinate origin；Known radome fairing crosses two o'clock, a little be recovery bin top edge minimum point A, coordinate be (mR,
0,L)；Another point be instrument bin bracket and radome fairing crosspoint B, coordinate for (mR-hsin (alpha-beta)-D-R, 0, hcos (alpha-beta)+
Δ l), hsin (alpha-beta)+D-mR+R are distance of the bracket away from disk pedestal center, and hcos (alpha-beta)+Δ l is support height；
The above two o'clock is brought into radome fairing equation, can be obtained:
According to above-mentioned linear equation in two unknowns group, parameter a, b is solved:
A and b is substituted into radome fairing equation, radome fairing numerical model is obtained:
(0,0, H) is substituted into radome fairing equation, radome fairing overhead height is obtained:
Step 7: determining each structural member relative position of preventing seabed base under constraint condition, when preventing seabed base tilt angle is α,
Instrument bin tilt angle should be not more than β, establish equation are as follows:That is S3 >=h sin (α-
β)+D/2, in order to meet the condition of preventing seabed base inner space optimization, distance and instrument bin and whole between instrument bin and recovery bin
Distance is S3=h sin (alpha-beta)+D/2 between stream cover；
Recovery bin can be placed in any position inside preventing seabed base, using recovery bin center as the center of circle, R/2+h sin (alpha-beta)+
D/2 is that radius draws arc, using disk pedestal center as the center of circle, with
Arc is drawn for radius, it is the region for meeting constraint condition, as instrument inside crescent that two arc intersections, which are crescent,
The position at device storehouse center, crescent moon inner arc and recovery bin are concentric circles, and equation isOuter arc and disk pedestal are concentric circles, equation are as follows:
It is that change in flow exists to the flow in ADCP beam area than surveying preventing seabed base contour structures in the step 1
Within 2cm/s, variation is flowed within 2 °.
In the step 4, the method that determines radome fairing shape are as follows: it is assumed that preventing seabed base periphery is incompressible fluid, use
The description of the continuous and equation of momentum:
Wherein ui、ujFor the velocity component on three directions (x, y, z)；FiIt is unit mass force along three directions (x, y, z)
Component；P is pressure；ηtFor turbulent flow viscosity；
It is zero that the boundary condition of Free Liquid Surface, which requires normal velocity, and needs to meet on the interface of liquid and gas
Stress equilibrium condition, i.e. liquid pressure are equal to gas pressure intensity, and the selection of time step △ t is limited by the size of courant number,
That is:
△ x in formulacellFor minimum grid length, VfluidFor maximum fluid velocity；
Numerical discretization uses finite volume method, and the diffusion term of governing equation is discrete using central difference schemes；The equation of momentum,
Tubulence energy equation and turbulence dissipative shock wave equation are all made of Second-order Up-wind format,
Compare the flow field change under shuttle table type design, circular-arc-shaped design, parabolical three kinds of preventing seabed base shapes of design, parabolical
Radome fairing is minimum to flow in situ.
In the step 6, the vertical baffle that setting height is P in the part that radome fairing connects with disk pedestal is determined than surveying
Preventing seabed base is sat crosslegged body radius, and radome fairing equation is three dimensional parabolic shape equation, and disk pedestal equation is two-dimentional equation of a circle when z takes P:
Sea bed basal surface radius can be obtained from above-mentioned equation:
For the damage for preventing radome fairing in use process, body diameter of sitting crosslegged should be slightly bigger than radome fairing basal diameter, take herein
Disk pedestal diameter is greater than radome fairing basal diameter 1cm, disk pedestal diameter are as follows:
The recovery bin 3 is installed on the position at preventing seabed base edge, and recovery bin 3 includes recycling rope storehouse 5 and shows a float cabin 4
Two parts recycle rope storehouse 5 and show the stainless steel plate interval between a float cabin 4 by intermediate hollow out, and hollow out diameter is less than two
/ mono- floating ball diameter.
ADCP of the invention is substantially former according to ADCP measuring principle and fluid dynamics in situ than surveying preventing seabed base construction method
Reason, can synchronize than surveying more ADCP, spatial optimization small to flow in situ as structure design object, using structural member
Parameters Optimal Design is theoretical, by the space structure layout designs optimization algorithm of procedure and parametrization, constructs the original position ADCP
Than surveying preventing seabed base structural model, realize that there are laws to abide by than surveying the design of sea bed based structures, solving ADCP can not asking than survey in situ
Topic.
Detailed description of the invention
Fig. 1 is ADCP of the present invention in situ than surveying preventing seabed base construction method flow chart.
Fig. 2 is in situ than surveying preventing seabed base incline structure schematic diagram.
Fig. 3 is in situ than surveying preventing seabed base instrument bin center schematic diagram.
Fig. 4 is three instrument bins in situ than surveying preventing seabed base top view.
Fig. 5 is three instrument bins in situ than surveying preventing seabed base side view.
In figure: 1, radome fairing, 2, body of sitting crosslegged, 3, recovery bin, 4, show a float cabin, 5, recycling rope storehouse, 6, instrument bin,
7, instrument bin bracket, 8, show a floating ball, 9, launch drainage column, 10, vertical baffle, A, recovery bin top edge minimum point, B, instrument
Device bin bracket and radome fairing crosspoint.
Specific embodiment
Sea bed based structures of the invention are as shown in Figure 4 and Figure 5, and recovery bin 3 and instrument bin 6, recycling are installed in 2 top of disk pedestal
Storehouse 3 include positioned at lower part recycling rope storehouse 5 and it is superposed show a float cabin 4, instrument bin 6 passes through the peace of instrument bin bracket 7
Loaded on ADCP on disk pedestal 2, is placed in instrument bin 6, radome fairing 1, which is located at, sits crosslegged on body 2.
Structural member Parameters Optimal Design theoretical method has become a kind of important mechanical structure optimization method, is set with structure
Meter parameter is that optimization object is solved according to given operating condition, constraint condition and instrument performance index by certain design object
To optimal structural design parameter.
Purpose, process and feature to facilitate the understanding of the present invention, below to ADCP in situ than surveying preventing seabed base structural parameters
Change design to be illustrated, these implementations are merely to illustrate the present invention, rather than limit the scope of the invention.
The ADCP flow diagram in situ than surveying preventing seabed base structure parameterization design method is Fig. 1 visible, comprising the following steps:
Step 1: clear ADCP is in situ than surveying sea bed based structures design object, comprising: can synchronize than surveying more ADCP；Than
Survey preventing seabed base contour structures are small to the flow in ADCP beam area, and by sea bed based structures, there are caused change in flow
Within 2cm/s, variation is flowed within 2 °；In order to reduce measurement error, distance will be as far as possible between more ADCP instrument bins
It is small；Preventing seabed base volume will minimize；There is versatility than surveying sea bed based structures.
Step 2: determining preventing seabed base Optimal Structure Designing constraint condition, including when than surveying 45 ° of preventing seabed base maximum tilt angle
ADCP still can be measured normally；The design of instrument bin should make ADCP energy converter not be rectified cover to block, also do not expose radome fairing；
Instrument bin overhead height should be consistent with radome fairing height；Floating ball storage capacity should can accommodate recycling rope and show a floating ball, and
Its top edge height should be consistent with radome fairing height.
Step 3: defining ADCP, ratio surveys preventing seabed base structural member Parametric designing variable in situ, influential on constraint condition
It include radome fairing 1, recovery bin 3, instrument bin 6 and body 2 of sitting crosslegged than surveying preventing seabed base main components, due to preventing seabed base overall structure
Complexity, there are the fine structures such as numerous small chamferings, small round corner, threaded hole, can be by it to implement convenient for numerical simulation
Removal.Disk pedestal (2) inclination angle alpha, instrument bin (6) inclination angle beta, instrument bin (6) diameter D, instrument bin (6) height h are returned
Storehouse (3) diameter R, recovery bin (3) height L, distance mR of recovery bin (3) distalmost end away from preventing seabed base center are received, instrument bin (6) is hung down
When straight state between body of sitting crosslegged (2) distance, delta l, bracket (7) width S 1, bracket (7) height S2, instrument bin (6) is away from recovery bin
(3) most proximal end distance S3, vertical baffle (10) height P.
Step 4: the microcosmic flow field model in preventing seabed base periphery is established according to fluid dynamics basic principle, passes through different shape
Radome fairing simulation test compares analysis, determines that radome fairing shape is parabolical.
Method assumes that preventing seabed base periphery is incompressible fluid, described using the continuous and equation of momentum:
Wherein ui、ujFor the velocity component on three directions (x, y, z)；FiIt is unit mass force along three directions (x, y, z)
Component；P is pressure；ηtFor turbulent flow viscosity.
It is zero that the boundary condition of Free Liquid Surface, which requires normal velocity, in this method, and on the interface of liquid and gas
Need to meet stress equilibrium condition, i.e. liquid pressure is equal to gas pressure intensity.The selection of time step is limited by courant number
Size, it may be assumed that
△ x in formulacellFor minimum grid length, VfluidFor maximum fluid velocity.
This method numerical discretization uses finite volume method (FVM), the diffusion term of governing equation using central difference schemes from
It dissipates.The equation of momentum, tubulence energy equation and turbulence dissipative shock wave equation are all made of Second-order Up-wind format, are conducive to the quick of solution in this way
Convergence and the accuracy for improving solution.
This method mainly compares: shuttle table type design, circular-arc-shaped design, parabolical design the flow field under three kinds of preventing seabed base shapes
Variation.It is assumed that three kinds of preventing seabed base bottom sizes are 1.17m, top dimension 0.4m, it is highly 0.55m；Wherein shuttle table type is whole
Stream cover bottom surface and top surface are square (having a size of side length), and arc-shaped and parabolical radome fairing bottom surface and top surface are circle
Shape (having a size of diameter)；Arc-shaped radome fairing is cone, and parabolical radome fairing side is parabolic transition.When numerical value calculates
Three kinds of radome fairings are placed in a long 20m × wide 12m × high 10m sink, and preventing seabed base is located at sink center position, rectification
Covering bottom and sink bottom is same level, and numerical simulation uniform flow field flows through variation when radome fairing, flow field velocity 0.6m/
s。
Numerical simulation result: it is influenced by the barrier of preventing seabed base radome fairing, three kinds of preventing seabed base radome fairing fluoran stream surfaces and lee side
There is flow velocity and reduce phenomenon, wherein the influence of lee side is more significant.Shuttle table type and arc-shaped radome fairing side form upper
Up-flow influences whether the top of instrument preventing seabed base, and then the oblique stream different from Background Flow Field is formed on preventing seabed base；And to throwing
Object shape radome fairing, due to its side parabolic transition, top flow field has been restored to Background Flow Field, therefore parabolical radome fairing
It is minimum to flow in situ.
Step 5: determine that preventing seabed base recycles chamber structure.Recovery bin includes recycling rope storehouse and shows float cabin two parts, point
Recycling rope Yong Yu not accommodated and show a floating ball, rope position in storehouse is in float cabin lower part, and the two is between the stainless steel plate of intermediate hollow out
Every (hollow out diameter should be less than half floating ball diameter).Recycling storage capacity should be able to accommodate preventing seabed base recycling needed for rope and
Show a floating ball.According to a floating buoyancy requirement is shown, it can be determined by Archimedes principle and show a floating ball diameter, recovery bin diameter
Should be slightly bigger than floating ball diameter, recovery bin height is taken as L=L1+L2, and L1 is recycling rope storehouse height, and L2 is float cabin height, wherein
The storehouse height L1 that restricts can determine that float cabin height L2 can be according to floating according to the maximum length of recovery bin diameter and required recycling rope
Bulb diameter and permission floating ball expose the ratio upper limit of radome fairing to determine.
Determine preventing seabed base instrument bin supporting structure.When body horizontal tilt angle of sitting crosslegged is α, the vertical tilt angle of ADCP is answered
No more than β.In situ Fig. 2 more visible than survey preventing seabed base inclination schematic diagram and Fig. 3.
Equation is established according to constraint condition:Support width can be obtained by solving above-mentioned equation
The condition that should meet are as follows: S1 >=2h sin (alpha-beta)+D takes herein in order to meet the requirement of preventing seabed base inner space optimization
S1=2h sin (alpha-beta)+D；The constraint condition that instrument bin bracket (7) height meets is S2- △ l >=h cos (alpha-beta), and equation is right
The vertical height of instrument bin when side h cos (alpha-beta) is run-off the straight；It is optimal when above-mentioned equation turns to equation, at this time
Support height S2=h cos (alpha-beta)+△ l can choose different △ l according to the ADCP of different model.
Step 6: the radome fairing functional equation under constraint condition is determined.Parabolical radome fairing fundamental equation are as follows: z=a (x2
+y2)+b, a, b are coefficient, and x, y, z is respectively the coordinate of three rectangular coordinate systems；Known radome fairing crosses two o'clock, is some recycling
Storehouse top edge minimum point A, coordinate are (mR, 0, L)；Another point is instrument bin bracket and radome fairing crosspoint B, coordinate are
(mR-hsin (alpha-beta)-D-R, 0, hcos (alpha-beta)+Δ l), hsin (alpha-beta)+D-mR+R are distance of the bracket away from disk pedestal center,
Hcos (alpha-beta)+Δ l is support height；
The above two o'clock is brought into radome fairing equation, can be obtained:
According to above-mentioned linear equation in two unknowns group, parameter a, b is solved:
A and b back substitution is entered in radome fairing equation, radome fairing numerical value equation is obtained:
(0,0, H) is substituted into radome fairing equation, radome fairing overhead height is obtained:
The smallest radome fairing form of flow is parabolical, easy for installation for radome fairing and disk pedestal, is being rectified
Cover the vertical baffle that the part setting height to connect with disk pedestal is P.
It determines and sits crosslegged body radius than surveying preventing seabed base.Radome fairing equation is three dimensional parabolic shape equation, disk pedestal equation when z takes P
For two-dimentional equation of a circle:
Sea bed basal surface radius can be obtained from above-mentioned equation:
For the damage for preventing radome fairing in use process, body diameter of sitting crosslegged should be slightly bigger than radome fairing basal diameter, take herein
Disk pedestal diameter is greater than radome fairing basal diameter 1cm, disk pedestal diameter are as follows:
Step 7: each structural member relative position of preventing seabed base under constraint condition is determined.For convenient for instrument installation and posture tune
Whole, instrument bin should should keep certain distance △ l with body of sitting crosslegged, and since sea-floor relief environment is complicated, preventing seabed base may when working
Run-off the straight is bumped against so as to cause instrument bin and recovery bin, to limit the posture self-adjusting of instrument, therefore in order to guarantee
ADCP can be monitored normally when instrument bin tilts, and need to be constrained the distance of instrument bin and recovery bin.
When preventing seabed base tilt angle is α, instrument bin tilt angle should be not more than β, establish equation are as follows:
That is S3 >=h sin (alpha-beta)+D/2.Preventing seabed base recovery bin take up space compared with
Greatly, it should be designed and, close to the position at preventing seabed base edge, be saved far from preventing seabed base center for preventing seabed base more internal empty
Between, and guaranteeing the streamlined of preventing seabed base entirety, recovery bin should not be exposed.
It determines than surveying preventing seabed base instrument bin location.The different instrument bin of preventing seabed base should be as close to design, so as to original position
The consistency of flow fields environment.The visible Fig. 4 of instrument bin center schematic diagram.
In order to meet the condition of preventing seabed base inner space optimization, distance and instrument bin and whole between instrument bin and recovery bin
Distance is designed to S3=h sin (alpha-beta)+D/2 between stream cover；
Recovery bin can design any position inside preventing seabed base, using recovery bin center as the center of circle, R+h sin (alpha-beta)+D/2
Arc is drawn for radius, using disk pedestal center as the center of circle, with
Arc is drawn for radius, it is the region for meeting constraint condition, as instrument inside crescent that two arc intersections, which are crescent,
The position at device storehouse center, crescent moon inner arc and recovery bin are concentric circles, and equation isOuter arc and disk pedestal are concentric circles, equation are as follows:
Instrument bin can design in Fig. 3 crescent.
According to operating condition variable and numerical model, each structural member parameter quantities of preventing seabed base are calculated, to facilitate the understanding of the present invention,
It is illustrated below with reference to a kind of preventing seabed base design example.General Principle defined in this method can not depart from the present invention
Spirit or scope in the case where, be achieved in other examples.
Duty parameter: preventing seabed base maximum tilt angle α is 45 °, and ADCP inclination angle beta is no more than 15 °, instrument bin height h
It is 26cm for 45cm, diameter D, instrument bin is 20cm away from chassis △ l, and float cabin height L is 55cm, and diameter R is 44cm, floating ball
Storehouse short side is 1.1R away from preventing seabed base center, i.e. m=1.1, height of baffle plate P are 20cm.
According to above method process, can obtain:
Support width are as follows: 2h sin (alpha-beta)+D=71cm, support height are h cos (alpha-beta)+△ l=58.97cm,
ADCP and float cabin distance are h sin (alpha-beta)+D/2=35.5cm.
Radome fairing equation are as follows: z=-0.00798 (x2+y2)+73.689；
Radome fairing height are as follows: 73.689cm；
Disk pedestal bottom surface equation are as follows: x2+y2=6727.94；
Disk pedestal diameter are as follows:
Crescent moon inner arc equation is (x+26.4)2+y2=57.52, outer arc equation are as follows: x2+y2=46.52。
The present invention is described by embodiment, and those skilled in the art know, is not departing from spirit of the invention
In the case where range, various changes or equivalence replacement can be carried out to these features and embodiment.In addition, of the invention
Under introduction, it can modify to these features and embodiment to adapt to particular situation and material without departing from the present invention
Spirit and scope.Therefore, the present invention is not limited to the particular embodiment disclosed, the power of fallen with the application
Embodiment in sharp claimed range belongs to protection scope of the present invention.
Claims (5)
1. a kind of ADCP is in situ than surveying preventing seabed base construction method, it is characterised in that: the following steps are included:
Step 1: clear ADCP is in situ than surveying sea bed based structures design object, comprising: can synchronize than surveying at least 2 ADCP；Than surveying
Preventing seabed base contour structures are minimum to the flow in ADCP beam area；Distance minimum, preventing seabed base between each ADCP instrument bin
It is small in size；There is versatility than surveying sea bed based structures；
Step 2: sea bed based structures design constraint is determined, comprising: ADCP can when than surveying 45 ° of preventing seabed base maximum tilt angle
Normally to measure；The structure of instrument bin should make ADCP energy converter not be rectified cover to block, also do not expose radome fairing；At the top of instrument bin
Height should be consistent with radome fairing height；Floating ball storage capacity should can accommodate recycling rope and show a floating ball, and its top edge
Height should be consistent with radome fairing height；
Step 3: ADCP is defined in situ than surveying preventing seabed base structure parameterization design variable: disk pedestal (2) inclination angle alpha, instrument bin
(6) inclination angle beta, instrument bin (6) diameter D, instrument bin (6) height h, recovery bin (3) diameter R, recovery bin (3) height L, recycling
Distance mR of storehouse (3) distalmost end away from preventing seabed base center, when instrument bin (6) plumbness between body of sitting crosslegged (2) distance, delta l, branch
Frame (7) width S 1, bracket (7) height S2, instrument bin (6) is away from recovery bin (3) most proximal end distance S3, vertical baffle (10) height P；
Step 4: the microcosmic flow field model in preventing seabed base periphery is established according to fluid dynamics basic principle, is rectified by different shape
Cover simulation test compares analysis, determines that radome fairing shape is parabolical.
Step 5: preventing seabed base recovery bin and instrument bin supporting structure are determined.According to a floating buoyancy requirement is shown, by Archimedes's original
Reason, which can determine, shows a floating ball diameter, and recovery bin diameter should be slightly bigger than floating ball diameter, and recovery bin height is taken as L=L1+L2, and L1 is
Recycling rope storehouse height, L2 are float cabin height；When disk pedestal (2) horizontal tilt angle is α, and the vertical tilt angle of ADCP is β,
Equation is established according to constraint condition:Solving above-mentioned equation can obtain what support width should meet
Condition are as follows: S1 >=2h sin (alpha-beta)+D takes S1=2h sin to meet the requirement of preventing seabed base inner space optimization herein
(α-β)+D；The constraint condition that instrument bin bracket (7) height meets is S2- △ l >=hcos (alpha-beta), item hcos (α-on the right of equation
β) be run-off the straight when instrument bin vertical height；It is optimal when above-mentioned equation is equation, at this time support height S2=
hcos(α-β)+△l。
Step 6: the radome fairing functional equation under constraint condition, parabolical radome fairing fundamental equation are as follows: z=a (x are determined2+y2)+
B, a, b are coefficient, establish rectangular coordinate system in space, x, y, z is respectively the coordinate components of rectangular coordinate system, in sea bed basal surface
Heart point is coordinate origin；Known radome fairing crosses two o'clock, is a little recovery bin top edge minimum point A, and coordinate is (mR, 0, L)；Separately
It is a little instrument bin bracket and radome fairing crosspoint B, coordinate is (mR-hsin (alpha-beta)-D-R, 0, hcos (alpha-beta)+Δ l), hsin
(alpha-beta)+D-mR+R is distance of the bracket away from disk pedestal center, and hcos (alpha-beta)+Δ l is support height；
The above two o'clock is brought into radome fairing equation, can be obtained:
According to above-mentioned linear equation in two unknowns group, parameter a, b is solved:
A and b is substituted into radome fairing equation, radome fairing numerical model is obtained:
(0,0, H) is substituted into radome fairing equation, radome fairing overhead height is obtained:
Step 7: determining each structural member relative position of preventing seabed base under constraint condition, when preventing seabed base tilt angle is α, instrument
Storehouse tilt angle should be not more than β, establish equation are as follows:That is S3 >=h sin (alpha-beta)+D/2,
In order to meet the condition of preventing seabed base inner space optimization, between instrument bin and recovery bin between distance and instrument bin and radome fairing
Distance is S3=h sin (alpha-beta)+D/2；
Recovery bin can be placed in any position inside preventing seabed base, and using recovery bin center as the center of circle, R/2+h sin (alpha-beta)+D/2 is
Radius draws arc, using disk pedestal center as the center of circle, with
Arc is drawn for radius, it is the region for meeting constraint condition, as instrument bin inside crescent that two arc intersections, which are crescent,
The position at center, crescent moon inner arc and recovery bin are concentric circles, and equation isOuter arc and disk pedestal are concentric circles, equation are as follows:
2. a kind of ADCP according to claim 1 is in situ than surveying preventing seabed base construction method, it is characterised in that: the step 1
In, it is change in flow within 2cm/s, flow direction variation to the flow in ADCP beam area than surveying preventing seabed base contour structures
Within 2 °.
3. a kind of ADCP according to claim 1 is in situ than surveying preventing seabed base construction method, it is characterised in that: the step 4
In, the method that determines radome fairing shape are as follows: it is assumed that preventing seabed base periphery is incompressible fluid, retouched using continuous with the equation of momentum
It states:
Wherein ui、ujFor the velocity component on three directions (x, y, z)；FiIt is unit mass force along point in three directions (x, y, z)
Amount；P is pressure；ηtFor turbulent flow viscosity；
It is zero that the boundary condition of Free Liquid Surface, which requires normal velocity, and needs to meet stress on the interface of liquid and gas
Equilibrium condition, i.e. liquid pressure are equal to gas pressure intensity, and the selection of time step △ t is limited by the size of courant number, it may be assumed that
△ x in formulacellFor minimum grid length, VfluidFor maximum fluid velocity；
Numerical discretization uses finite volume method, and the diffusion term of governing equation is discrete using central difference schemes；The equation of momentum, turbulence
Energy equation and turbulence dissipative shock wave equation are all made of Second-order Up-wind format,
Compare the flow field change under shuttle table type design, circular-arc-shaped design, parabolical three kinds of preventing seabed base shapes of design, parabolical rectification
Cover is minimum to flow in situ.
4. a kind of ADCP according to claim 1 is in situ than surveying preventing seabed base construction method, it is characterised in that: the step 6
In, the vertical baffle that setting height is P in the part that radome fairing connects with disk pedestal is determined and is sat crosslegged body radius than surveying preventing seabed base,
Radome fairing equation is three dimensional parabolic shape equation, and disk pedestal equation is two-dimentional equation of a circle when z takes P:
Sea bed basal surface radius can be obtained from above-mentioned equation:
For the damage for preventing radome fairing in use process, body diameter of sitting crosslegged should be slightly bigger than radome fairing basal diameter, take disk seat herein
Body diameter is greater than radome fairing basal diameter 1cm, disk pedestal diameter are as follows:
5. a kind of ADCP according to claim 1 is in situ than surveying preventing seabed base construction method, it is characterised in that: the recovery bin
(3) it is installed on the position at preventing seabed base edge, recovery bin (3) includes recycling rope storehouse (5) and shows a float cabin (4) two parts, returns
Rope closing rope storehouse (5) and show the stainless steel plate interval between a float cabin (4) by intermediate hollow out, hollow out diameter is less than half
Floating ball diameter.
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