Author: Fierce , of foreword of Song Mingtai and traditional metallic alloy airscrew are compared, composite material airscrew is had wait for character high than intensity, tall damp, use these character to be able to reduce the weight of airscrew and moment of inertia considerably, get used to change of field of buttock transmitted echo oneself, raise propulsive efficiency and improvement paddle vacuole function and material damp character, abate airscrew and shafting coupling are oscillatory, achieve the goal that reduces airscrew radiate noise thereby. Because airscrew of this composite material is on merchant ship and naval ship,have wide applied perspective. Airscrew of foreign composite material already had development history of nearly 50 years, inchoate application issues a robot at water of torpedo, own style (AUV) , the small-sized shipping such as houseboat and voyage body. In recent years, composite material airscrew got applied on submarine and large merchant ship, prove its are mixed in energy-saving synergism decrease brace up fall respect of a confusion of voices has favorable effect. In home, consider composite material airscrew reduce heavy advantage, in small-sized go implement on used composite material propeller, adjust in order to come true deserve to reach the goal that extends add boat time again, but in the application on large naval ships Shangbuduo sees. Function of airscrew of inchoate research composite material is used more situation shedding and finite the method of yuan of union will calculate paddle suffers force to reach be out of shape, later, develop to use gradually stick stream with finite the method of yuan of union will calculate the oscillatory coupling of onflow flow and paddle. From public document the report is seen, the research work of domestic and international scholar basically is centered in composite material parameter, paddle to be out of shape the macroscopical influence respect that waits for character of pair of airscrew water motivation, and delicacy has those who involve paddle vibration, onflow and eddy to fasten coupling action to issue airscrew to phonate mechanism and decrease brace up fall mechanism of a confusion of voices, study a target also basically measure of model of bureau be confined to, and imitate of much number value and theoretical analysis, lack reliable experiment test and verify, open test result is very finite also. In model of composite material airscrew (call “ paddle model ” below) with true measure airscrew (call “ fact paddle ” below) the similar concern of the experiment studies respect, young compared the difference that the likeness such as number, Reynolds number, Mach number brings Fulaode in the light of metallic alloy airscrew, the paddle model test that offerred the geometry below good position and material likeness should satisfy the requirement with equal Mach number, namely paddle model and linear velocity of solid paddle tip are identical. But, in view of the anisotropy of composite material, its have fine view structure and numerous mechanical performance data, below the influence of preparation craft, the paddle model after treatment and solid paddle are mixed in material, geometry of mechanical function shrink to be put more possibly than the respect in difference, all parameter that assures both hard satisfies similar concern, reason still needs to combine actual paddle model and test to the circumstance extracts main likeness parameter and analyse its to affect the pattern. 1. The characteristic of action of coupling of paddle shedding solid and traditional metallic alloy airscrew are compared, the stiffness of composite material airscrew is relatively inferior, in the paddle below action of water power load coupling of easy generation crankle is out of shape (graph 1) , have apparent water flexibility effect, bring about paddle pitch, vertical bend, section plane to study the parameter such as horn and change of performance of its water power, the deformation that causes paddle again then produces a change, the interaction of coupling drifting solid arises between composite material paddle and fluid namely.
Current, home basically did not use propeller of large composite material on solid boat, if cannot solve a lot of fundamental sex problems adequately, begin solid boat experiment to be able to be put in bigger risk directly. Not only such, experiment of large scale airscrew is mixed to outfield condition, drive the demand that tests equipment is higher, and the effect that existence outside interference and inaccuracy decide an element. Accordingly, show level to should begin what lab environment falls morely to shrink than measure model test. The graph is shown 2 times it is disparate test velocity of flow (4 with 5 M/s) next some 5 leaves composite material airscrew paddle model (“ calls ” of answer material paddle in the graph) pattern of as same as geometry value paddle of metallic alloy paddle (“ metal paddle calls ” in the graph) . Those who need to point out is, KQ of coefficient of the thrust coefficient KT that metallic paddle model issues in different velocity of flow, torque reachs coincide of efficiency η curve, reason is in graph 2 in express to be one cento line. And the KT that experiment of model of answer material paddle gets, KQ and η photograph present a trend that drop than metallic paddle model, the thrust coefficient below different velocity of flow and difference of torque coefficient existence. This shows paddle of answer material paddle is below action of water power load, its are out of shape can bring about performance of airscrew water power to appear the change of different level, the metabolic extent that brings about by the difference with both paddle mechanical and characteristic material can be amounted to 20% . In addition, paddle is out of shape the foliaceous section plane that bring about attacks horn to differ, make the feature of going from place to place of section plane of fluid course paddle different, still can affect paddle to be out of shape in coupling drifting solid the blame that is in the position decides motivation of constant arteries and veins, affect answer material paddle then phonate mechanism, change its low frequency and property of medium, high frequency noise. In model test of current airscrew noise function, use rigid processing more to metallic paddle, consider water motivation noise only commonly, and to answer material paddle, if introduce the stretch issue of paddle, need to consider water motivation and oscillatory coupling noise integratedly.
The mechanical character of composite material airscrew, rotate the motivation of water of coupling drifting solid that the paddle of the generation in the process is out of shape with motion the feature affected airscrew directly, vibration and noise function. In model test, if take no account of paddle metabolic likeness, not right of model measure and true measure paddle be out of shape undertake imitate, use the similar standard that model of traditional metal paddle experiments only, likelihood cannot the real work place of airscrew of composite material of reductive true measure, and imitate its move and be out of shape condition, and between water motivation and result of noise model test and solid paddle also cannot corresponding conversion. Accordingly, add up to sleave to exhibit the water motivation of composite material airscrew and noise function model test, need to establish relation of likeness of consideration paddle metabolic and conversion method on one hand, still need to combine paddle model treatment and model test condition to establish form a complete set on the other hand examine and check a method. 2. The characteristic of similar concern wants to begin composite material airscrew the model test of function of water motivation harmonics and forecast of true measure function, the similar relationship that establishs both is a foundation. of relation of water motivation likeness is in metabolic of 2.1 considerations paddle when the open water that launchs model of traditional metal paddle experiments, the likeness that needs the character such as contented airscrew geometry, motion and motivation concerns. Analyse a method according to dimension, if paddle axis immersion is deeper,the paddle model of geometric similarity is in in open water when movement, performance of its water power counts Re to concern with J of coefficient of speed of advance and Reynolds only. But because lab environment issues the coefficient of speed of advance of paddle model and Reynolds number,come true very hard like solid paddle, the kind that takes the critical cost that number of equal, Reynolds defines coefficient of speed of advance more than so completes a test. Mix through enough immersion depth the water of paddle model open that exceeds critical Reynolds several times experiments, consideration Reynolds counts distinct scale effect effect, after amending gotten thrust coefficient and torque coefficient classics, can use at the forecast of character of motivation of solid paddle water. And when beginning vacuole function to experiment, the vacuole environment that assure paddle model and solid paddle through defining vacuole to count is similar. Likeness of experiment of model of traditional metal paddle concerns is handle paddle as tigidity and did not consider paddle be out of shape element, and paddle of composite material airscrew is out of shape to water dynamic the influence cannot be ignored, paddle of the consideration on the foundation that need concerns in likeness of paddle model experiment is out of shape similar, amend via complement form composite material airscrew the similar concern that model of paddle of water power performance experiments. Because the workmanship of composite material airscrew is special and material has anisotropy, accomplish paddle model and solid paddle to be in hard so fine view structure and respect of mechanical performance data are completely similar, and can from macro-mechanics function angle, the macroscopical and equivalent stiffness that passes airscrew of tie composite material and athletic character will control paddle to bear the weight of in water motivation the deflection below, in order to achieve the goal of paddle model and solid paddle motion and dynamical likeness. Experiment of model of composite material paddle and photograph of experiment of metallic paddle model are compared, when affirmatory likeness concerns, the stiffness character information that before different point depends on an experiment, its want to get paddle model and solid paddle greatly, in order to be used at deciding the operating mode that water power performance experiments. Shrink when what decided model of composite material paddle and solid paddle after more mechanical than measure, material characteristic parameter and water medium environment, be worth through the paddle model rotate speed that in solid paddle the computation below operating conditions gains one decides, calculate the velocity of flow of paddle model test inside limits of coefficient of speed of advance is worth key link of solid paddle boundless, is the specific value that holds velocity of flow and airscrew rotate speed not only changeless will satisfy the requirement with identical coefficient of speed of advance. Be aimed at the different operating conditions of solid paddle, the model test operating mode that conversion gets should satisfy a lab to test equipment requirement. In addition, still need what consider experiment model integratedly to shrink to be mixed than measure performance data of paddle model data, in order to decide model test operating mode. The solid boat application that shows airscrew of level composite material and solid boat data are relatively finite, the main and similar parameter of acoustics to affecting composite material airscrew function still knows inadequacy, grasp the influence pattern of relevant parameter not completely. Be opposite when paddle model solid paddle parameter cannot when complete imitate, to paddle model and solid paddle vibration noise sound presses as square as the power of speed K to concern, still need the airscrew noise property that according to differring for many times experiment operating mode leaves to check a result, analyse the metabolic pattern that extraction counts along with main likeness from which, consider to build composite material propeller thereby the academic correction of acoustics function and extrapolate method. 3. The characteristic that tests a technology and photograph of metallic paddle model are compared, the similar concern that to satisfy composite material airscrew water motivation character and model of noise function paddle experiment asks, the paddle model objective that combinative treatment shapes and paddle are in what generation rotates in water medium to shed solid coupling characteristic, mix before the experiment need to build special test technology in experiment process. The geometry that standards of pair of composite material paddle want before static state of 3.1 paddle model value and of technology of mechanical function test experiment value and mechanical function have a test. Be comprised in view of the material of composite material airscrew and metallic alloy airscrew and machine craft to differ, show level to use mould pressing, braid, colophony delivers moulding to wait shape model of the craft paddle that make, the treatment precision that its geometry value all achieves metallic paddle standard hard (±0.1 Mm is controlled) . Concern in GB/T 12916—2010 of standard of comparison marine the definition of airscrew treatment precision, at present metallic paddle model can achieve prep above S-s to exceed special the treatment precision of paddle of high accuracy class, and model of composite material paddle can achieve 1 class high accuracy only the precision level of paddle. Especially blade tip ministry and guide the processing respect that follows an edge, because the fiber cloth lay up of composite material and sizy felt means are reached,shape the requirement limitation of paddle intensity, model of the paddle after local and special processing is possible with solid paddle it is certain to shrink to exist than measure difference. In addition, shape to go to the lavatory the implementation of craft and precision control, composite material airscrew is sheet more piece paddle and hub of metallic alloy paddle assemble form of connective fission form model, and the model of paddle of complete composite material of paddle and type of paddle hub an organic whole is less, outside the error that so paddle model exists except paddle oneself treatment, those who return existence and hub of metallic alloy paddle assemble the consistency error between error and each paddle to wait. Accordingly, to satisfy the geometric similarity requirement of model of composite material paddle, before the experiment, need those who establish geometry of pair of paddle model objective value to detect technology, in order to assist the test result of performance of analytic water power. If the graph is shown 3 times, dispersed on the paddle that be measured mark is nodded, use three-dimensional laser to photograph get paddle like scanning system three-dimensional model, analyse with numeric model contrast next, the ply that attainable paddle model grows positional area in different radius chord, pitch model value and machining error information.
Because the anisotropy of composite material reachs stiffness? Damp can design sexual characteristic, the paddle of identical geometry value can reach positional difference because of means of lay up of in-house fiber cloth and have different inherent character, if want those who satisfy paddle model paddle,be out of shape so similar, still need to get the mechanical performance information of the fine view that needs the standard that measure paddle and macrostructure, the solid ship conversion that borrows this to undertake is out of shape similar number, operating conditions and model check a result. If the graph is shown 4 times, use dynamic material to check system testing paddle to be in first different bear the weight of the displacement below? Load concerns, means of attainable different to load leaves the equivalent stiffness message of model paddle, the data performance data that combines solid paddle next and solid boat operating conditions, decide the experiment operating mode of the model. If the graph is shown 5 times, measure the natural frequency of paddle and mode vibration shape, the vibration that can get composite material airscrew is characteristic, in order to undertake the conversion of oscillatory noise function.
Normally the circumstance falls, structural function experiment is chosen more shrink than not be more than the large scale model of 6, and water motivation and the paddle that noise function experiments modular criterion measure is lesser, control in 250mm about, because this shrinks in the model,than also needing to give on the choice of measure balance considers. That is to say, should make sure structural function experiment can get the macro-mechanics performance information of paddle model, cannot be in only geometric similarity and mechanical function develops test of water power performance directly below sealed circumstance; The operating conditions of paddle model experiment that gets by similar concern conversion still should satisfy the requirement of rotate speed of lab paddle axis and span of pump dynamograph test. In addition, paddle model shrinks to check equipment condition and model material character to because always balance is certain,wait than also needing to join a lab. Begin before the experiment detect accordingly the analysis works, in order to satisfy similar concern and the integrated requirement that test a system. The water motivation that 3.2 paddle trends is out of shape test technology begins composite material airscrew and noise function check an analysis, outside waiting for stable state parameter to measure except groovy airscrew axial thrust, torque, still need what blade falls in water motivation action to develop composite material to rotate be out of shape measure a technology, be out of shape in order to obtain the trends of paddle feature, thereby to composite material airscrew result of water motivation and noise function test undertakes assisting an analysis. If the graph is shown 6 times, before model test, spray to paddle black and white medicinal powder spot image, use camera of 2 high speed to film paddle is rotating the image in the process, next, according to the method is being analysed to be opposite related each other 2 camera are in the paddle of same hour comes loose spot image undertakes reframing, get the paddle deflection that paddle issues in load of different water power, get composite material airscrew is rotating then the metabolic information that the pitch in the process, vertical bend, section plane attacks the parameter such as horn.
Composite material rotates the trends of paddle is out of shape test, can be out of shape to paddle computational imitate method undertakes experiment test and verify on one hand, it is to detect on the other hand whether does the paddle in model test achieve water motivation to be out of shape similar requirement, the paddle that job of reductive fact paddle nods runs state, undertake corresponding true measure conversion according to water motivation and result of noise model test then. The article is aimed at conclusion to likeness of experiment of model of the action of coupling drifting solid of airscrew of shipping composite material, paddle concerns and checked technical characteristic to undertake discussion, get following verdict: 1) the mechanical character of composite material airscrew, paddle in rotating is out of shape and athletic feature was affected directly its grade motivation of solid coupling water, vibration and noise performance, those who build paddle model and solid paddle need to be out of shape likeness concerns in the experiment. 2) begin composite material airscrew water motivation and experiment of model of noise function paddle remove the similar concern that requires test of model of contented metal paddle outside, the assorted likeness that still wants character of contented paddle stiffness and blade tip Mach number is spent, is the specific value that holds velocity of flow and rotate speed not only changeless will satisfy boundless principle coefficient of speed of advance is identical. 3) mix before paddle model experiments in the experiment, the paddle model geometry that needs to build a static state value, mechanical function and dynamic paddle are out of shape wait for test technology, shrink in order to choose reasonable paddle model to reach its material than measure, after making sure paddle model experiment satisfies similar concern to ask, ability undertakes integral performance analysis and true measure conversion. (origin: Ship vessel studies, author: Fierce , song Mingtai, textual caption: The characteristic of model test of airscrew of shipping composite material is analysed) shipbuilding industry accepts the order the quantity is successive 3 years the 2nd, 7 years, market prospect but period; Shipping and marine project are carbon of Da Feng of implementation “ carbon to neutralize goal of ” double carbon, to light quantify, 0 discharge, new fuel boat design and application have pressing demand, demand is here medium, composite material is hasten of applied tide place. Reason this, implement 945 programs to be carried out in the round, the shipping that help strength and marine project finish the historic job of double carbon target, study communicates craft of the advanced technique of composite material of domestic and international shipping and goods, forward position and tendency of the market, guild of fishing gear of plane of fishing of fisher of branch of a light boat of boat of shipping industry guild, Guangdong and answer ability network is on March 2022 27-29 day in Guangdong? Zhuhai sponsors “2022 shipping composite material to apply · of new material of height forum and new technology · jointly site of new application plant demonstrates meeting ” , the expert scholar deepness that invites shipping and marine project discusses communication new vessel, new material, new application. This second forum theme is " shipping quantifies " as gently as marine project. Forum will make trade report by secretary-general of branch of a light boat of boat of shipping industry guild, invite famous boat look forward to scholar of expert of place of courtyard of technologist, scientific research makes professional report, make delegate attending the meeting understands this domain composite material objectively to use the current situation deep, say a technology, talk about application, analyse market, compose builds ” of market of terminal of — of equipment of — of goods of — of material of a “ not to have the entire industry catenary that seams a butt joint to optimize platform. The achievement of scientific research of goods of partial composite material that forum still plans to reveal school of domestic scientific research, build case grind produce butt joint platform, be helpful for an enterprise carrying a design on the head to reach adjust a program, produce composite material and product advantage, help the prosperous development that promotes shipping and marine project. In the meantime, inc. of science and technology of a light boat of starfish houseboat group, river dragon boat still sees arrangement during forum, inferior Inc. of group of optical science and technology (original name: Sunbird houseboat Inc. ) wait for 4 enterprises, a light boat of spot study boat composite material workmanship. Invite sincerely expert of domain of domestic and international composite material, scholar, entrepreneur and industry colleague to arrive at congress, conspire answer material new tomorrow. Sponsor unit composite material website of of guild of fishing gear of plane of fishing of fisher of Guangdong of of branch of a light boat of boat of guild of shipping industry assist run group of houseboat of unit sea star of Inc. of science and technology of a light boat of river dragon boat inferior Inc. of group of optical science and technology (original name: Sunbird houseboat Inc. ) current situation of shipping of of congress topic for discussion and application of composite material market and of prospective development direction combine material the advantage in strategy of shipping double carbon and case analysis exceed 40 Mi Yunwei boats research and development of composite material technology and difficulty tackle key problem , " yacht estate " magazine chief editor, pursue yacht industry research for a long time. Report title: The current situation of yacht estate reachs outline of report of development trend : 1. The definition of houseboat and of industrial catenary 2. of of yacht industry current situation 3. of of current situation of industry of European Union yacht 4. of of current situation of Italian yacht industry 5. of of current situation of American yacht industry 6. Group of houseboat of sea star of of visiting enterprise of yacht industry current situation and trend (Heysea Yachts Groups) headquarters is set in Hong Kong, manufacturing radical position is met newly at be located in river retail sales area, father and administrative layer have nearly 20 years of professional houseboat to make experience, have an outstanding research and development to design a group to reach gather together canal of the quality control of rich experience, craft accuses and the team of skilled major skilled worker. Company business advocate large houseboat reachs caique in battalion research and development, design and production, next products basically divide the banner to reach caique for houseboat, super houseboat 3 big board piece, get on international new science and technology and fashionable element apply quickly on boat a light boat, those who bring the character experience that ship-owner craftsmanship has alone and maritime nobility way of life is cheerful enjoy. Starfish has powerful research and development, design to reach build capacity, individuation is custom-built in large houseboat, it is domestic home achieves ship's classification society (CCS) the manufacturer of houseboat model attestation, have rich Italian ship's classification society (experience of attestation of RINA) attestation, CE attestation, Hong Kong maritime arrange. Inc. of science and technology of a light boat of dragon boat of river of of Inc. of science and technology of a light boat of river dragon boat is A appear on the market enterprise, held water 2003, subsidiary of Zhongshan branch, Zhuhai branch, bay dragon, Hong Kong subsidiary is owned below the banner, already formed official business to execute the law, travel exercise of recreational, special type and a light boat of boat of new energy resources 4 big advocate business Wu, it is home has steel at the same time of productivity of research and development of a light boat of qualitative boat of qualitative, aluminium alloy and complex material medium or small of domain of fractionize of high-powered boat a light boat get army enterprise. Jiang Long is with innovation of science and technology lead, have database of rich boat design and high-end professional, have first class shipping to design aptitude, army article bear build aptitude, by class guild is maintained for aluminium of “ steel — shipping research and development produces base ” , obtained “ the multinomial honor such as ” of workstation of postdoctoral scientific research of ” of demonstrative business of plant of green of ” of company of new and high technology, “ , “ and aptitude, have hundreds. Inferior Inc. of group of optical science and technology (original name: Sunbird houseboat Inc. ) devotes oneself to hi-tech marine electron, marine the research and development of equipment and its product, design, production. It is provider of solution of system of a light boat of boat of radar of war industry electron, microwave, intelligence. The company registers capital 600 million yuan, have Zhuhai of Hunan Changsha, Guangdong and Sichuan Chengdu area of 3 industry garden, company staff number 2500 people. Product of a light boat of sunbird intelligence boat shares 3 old series: Special type a light boat (from 10m-80m) 20 norms, 30 kinds of model; Business uses a light boat (from 10m-90m) 20 norms, 50 kinds of model; Houseboat (from 6m-60m) 30 kinds of norms, 60 kinds of model. Product sale enclothes 32 provinces, it is among them China provide product and service for the well-known company such as electric equipment of power of company, division. Company own brand enters an international market successfully already, exit comes the United States, England, Italy, Spain, Australia, southeast Asia, middle east and Africa and America with the area. Plan to invite join of meeting unit 1. Shipbuilding industry and of of wind phone company 2. Business of production of goods of domestic and international composite material and of of unit of composite material design 3. Domestic and international composite material produces supplier 4. Tool of application of domestic and international composite material and equipment supplier 5. Program of of place of courtyard of scientific research of shipping composite material arranges on March 27 (Sunday) 13:00-21:00 congress reports, butt joint communication. On March 28 (on Monday) congress that day 09:00-12:014:0 of 0 0-18:019:0 of 0 0-21:0Market of composite material of 0 shipping analyses a report. Use a report shipping new material, new technology, newly. Welcome late banquet, business affairs negotiates. On March 29 (Tuesday) 08:30-15:00 sees a company, the problem that in be being produced actually in the light of answer timber plant, encounters spreads out discuss. Time / place time: Ground of —29 day nodded on March 27, 2022: Item meeting Wu expends member of network of standard answer ability related Guangdong Zhuhai : 3000 yuan / person, of of person of blame member 3800/ (contain pass of data of all and relevant conference, conference and conference have dinner) . Note: Accommodation unites arrangement by meeting Wu group, charge provides for oneself. Meeting Wu cost presses a requirement to be collected ahead of schedule please assign account, meeting Wu group is centralized open bill, data of make out an invoice sends mailbox please:
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