The deep oceans abundant mineral resources,which,if commercially exploited,could become a potential solution to the energy crisis.The prerequisite for mining these minerals is the safe and precise deployment of mining equipment at designated locations.Currently,two deployment schemes have been proposed:separate and combined deployment methods,but their relative advantages remain unclear.Based on the lumped mass method,models for the separate and combined type deployment of deep-sea mining systems were established.The study compared the two deployment methods under three working conditions with depths of 1 500,3 000,and 4 500 m,according to mineral properties.The results indicate that:1)Separate type deployment can better control the displacement accuracy of mining equipment,with the mining vehicle's displacement accuracy improving by an average of 9.92%and the buffer by 11.38%compared with combined type deployment.The bending moment at the bottom end of the combined type lifting pipe is significantly greater than that of the separate type,averaging 3.5 times higher.Separate type deployment is preferable if high placement accuracy is required.2)Under complex sea conditions,the hoses and deployment cables in separate type deployment are prone to entanglement,with the maximum entanglement force reaching 20.91 kN,which may cause pipeline wear and breakage.Therefore,combined type deployment is recommended in complex sea conditions.
deep-sea miningdeployment systemseparate typecombined typelumped mass method
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