Shipping collision synchronism injures process research

Dytran, right the synchronous injury character that bumps boat Shou ministry and side of side be bumpinged into undertakes colliding emulation study. 2, collision model is compared one kind for research general and hazardous condition, the article assumes the boat of two same type produces perpendicular collision, their draft position when collision is same, float at surface. Build modular workload to decrease, shorten computational time, need not serve as model of two marine full boats finite the computational model of yuan of analysis. The Shou ministry that the article will strike a ship and the shipboard of boat be bumpinged into bump an area to handle alterable shape structure, regard computation as the model, come through defining attrib border tie and great quality unit the collision effect of model of imitate full boat, be bumped into when collision ship vessel still is on surface, shipboard gets of ministry of Shou of another ship vessel perpendicular bump, collision model is shown 1 times like the graph. Graph model of 1 collision model uses some model frigate ship system configuration, shou ministry model takes the column that it is Shou to come 15# costal region one Duan Jian body, shipboard model takes 94# costal region to 114# costal region ship system, ship system material is same, use linear aggrandizement to play plasticity model, consider material meet an emergency to lead sensitivity. Because naval vessel Shou and shipboard structure are limited the reseau measurement of yuan of model is different, meet an emergency of their invalidation of the biggest plasticity is respectively 0.

43 with 0.

33. Finite yuan use unit of 4 node housing entirely, the division check the number of the model is 24763, unit number is 24515, if pursue,2 are shown. Graph 2 finite yuan of model 3, computational result and its analysis are used large nonlinear finite MSC of yuan of program of analyse of dynamic noisy part of one's job.

Dytran, undertake to afore-mentioned collision models numerical value is emulated. On P4 computer, track computation to arrive to bump about deep 0.

45 meters when (go up right now board and shipboard shell plating already burst) , require operation about 23 hours (82, 014 seconds) . 1.

The injury after structural synchronism injury is out of shape structure of naval vessel Shou and shipboard structure are bumped is out of shape result, if pursue,3 are shown. Graph 3 boats Shou and injury of shipboard structure collision are out of shape (local) from the graph 3 in can see, because tonnage and draft position are same, structure of ball nose Shou did not receive lay a finger on to bump to side of side be bumpinged into, what with shipboard structural happening collides is part of pitch of column of Shou of waterline upper part, the collision area of boat be bumpinged into reachs conjoint shipboard shell plating in superstratum board. Still can see from inside the graph, bump the shipboard interior that the Shou post part of boat Shou has cut ship be bumpinged into, be bumped into at this moment the shipboard shell plating of the boat and on board all produced burst, but bump boat Shou to the ministry was not out of shape greatly and be injured, also do not have burst. Notable is, collision makes bumped boat Shou ministry to happen to tilt in captain direction. In real side direction when perpendicular collision, bump a boat to also can happen to tilt fore-and-aftly, but the Shou ministry that article number estimation calculates tilts condition and true condition differ somewhat, the account that produces this kind of situation has the following. (1) will bump a boat to simplify to have Shou ministry structure only, those who rectify boat weight to be added at boat Shou is hind, although made sure percussive kinetic energy is changeless, but the fore-and-aft and rotational axle center that the fore-and-aft and rotational axes when full boat is bumped wants to be more than boat Shou structure far, namely the inertial rules of captain direction is different slant angle and true condition photograph are older than slanting. (2) is bumped into the boat simplifies cabin of a shipboard paragraph hind, two end brought to bear on to restrain, restricted the roll of beam direction, also make the emulation computation of Shou ministry tilts angle and true condition photograph are older than slanting. (Collision of ship of go ashore of 3) true condition happens in water, water has damp effect to its motion, and the impact that water did not consider when emulation computation, also can make Shou ministry produces bigger banking angle to spend. Although be in collision process, the collision attitude of Shou ministry and true true condition are put in trifling difference, but the validity that does not affect a result basically. 2.

The injury that bumps structure of boat Shou ministry is out of shape the injury after bumping boat Shou structure to produce collision is out of shape circumstance, if pursue,4 are shown. Graph injury of structure of 4 boats Shou is out of shape naval vessel Shou collides the injury of local district is out of shape, if pursue,5 are shown. Graph injury of structure of 5 boats Shou is out of shape (local) from the graph 5 in can see, of Shou ministry structure be out of shape not quite, what Shou ministry shell plating produced certain level is inflectional be out of shape, the area that collides directly with ship side happened bigger pressure;burst;ulcerate;fester be out of shape. 3.

The injury after the injury of structure of side of side be bumpinged into is out of shape structure of side of side be bumpinged into produces collision is out of shape circumstance, if pursue,6 are shown. Graph injury of 6 shipboard structure is out of shape from the graph 6 in can see, reach with the ship side of barge against of naval vessel Shou directly on board part happened very big be out of shape, occurrence burst, and of other area be out of shape very small, the loss that shows shipboard structure is out of shape have local sex, basically center in collision area. Shipboard structure injury is out of shape local graph, if pursue,7 are shown. Graph injury of 7 shipboard structure is out of shape (local) from the graph 7 in can see, shipboard shell plating produced drawing to be out of shape, end had been dissectioned a breach by boat Shou on, this breach will be ceaseless as collision continuity deepen increase, cause disastrous consequence finally. Can see at the same time, the board that is linked together to it also produced invalidation, occurrence burst. Anyhow, to shipping of such a simple case, when the shipping Shou ministry that sufferring identical tonnage is bumped with regular rate, shipboard structure produces the damaged of shipboard almost inevitably. 4.

Two boats produce impact force the curve of impact force time process when collision, if pursue,8 are shown. Graph curve of time process of 8 impact force from the graph 8 in can see, in collision process, the structure appeared for many times uninstall a phenomenon, impact force is had very strong nonlinear characteristic. This impact force can regard the wallop that strikes a ship as, also can regard the resistance of boat be bumpinged into as, but its metabolic trend still basically is by the shipboard of boat be bumpinged into structure and injury are out of shape of the decision. In barge against initial stage, although impact force has wave motion but rise ceaselessly, appear even superstratum board when shipboard shell plating and photograph after burst (A is nodded) , impact force drops quickly, increase as what contact an area, injury is out of shape area expands gradually make impact force rises again. What can foreknow is, although shipboard structure still has certain counteractive capacity, impact force is put in definite potential, but as collision continuity, the broken breach of board side panel can be increased ceaselessly, cause cabin inevitably to drink water, make resistance loses a sense thereby. 5.

Energy absorbs what boat Shou and structure of side of side be bumpinged into bump in article to suck can be the stress that we study, the energy of boat Shou and shipboard structure absorbs a circumstance, if pursue,9 are shown. Graph 9 boats Shou and shipboard structure collision are sucked can the curve is compared from the graph 9 in can see, the energy of shipboard structure absorbs the energy that is more than Shou ministry apparently, this result test and verify the hypothesis that making usually. Usually, the suction that the suction of Shou ministry structure can be less than shipboard structure can ability, to simplify so structure of ministry of computational general Shou assumes for rigid body, and capabilities is full by shipboard structure be out of shape will absorb, this kind simplifies to be being bumped into it is be content to retain sovereignty over a part of the country is whole for the boat. But, the numeric emulation computation that carries the article should notice, for the shipping of similar to having tonnage and configuration, when producing perpendicular collision, the ministry also absorbed the Shou that strikes a ship to comparative the energy of one part (occupy about always suck can 25% ) , can make the scathing deformation of boat be bumpinged into gets alleviating relatively so. The suction from boat Shou and shipboard structure can be returned in the curve can see, shou ministry and shipboard structure have a paragraph to suck can increase faster phase and slow level. The beginning of boat Shou structure in collision level increases faster, local plasticity happened to be out of shape in this one phase, but the burst invalidation as shipboard structure, of boat Shou be out of shape the trend is slow come down, suck can growth also subsequently hasten delay. Shipboard structure is absorbed in the energy after collision begins increase rapid, at the same time the structure happened bigger local and inflectional be out of shape, reach till shipboard shell plating on board burst, the counteractive ability of shipboard structure drops quickly, suck can growth becomes gently. Because be simple housing construction, shell plating burst meant shipboard to had achieved ultimate status, so the collision before occurrence burst of shipboard shell plating is sucked can the circumstance is the stress that we study. The energy of different component absorbs shipboard structure curve, if pursue,10 are shown. Graph different component energy absorbs 10 shipboard structure curve from the graph 10 in can see, before occurrence burst of shipboard shell plating (about 0.

15 seconds) , board and shipboard shell plating are sucked can most and rise alternately, suck can ability photograph is about the same, vertical bone of the transverse framework structure that is linked together to it and shipboard also was absorbed quite proportional be out of shape can. After occurrence burst of shipboard shell plating, on the suction of board can ability exceeded shipboard shell plating, board went up to also appear after rising quickly for some time invalidation, capabilities adds again scarcely, and shipboard shell plating is after burst as participate in metabolic limits to expand, suck it is certain to still can maintain raise rate, vertical character of the transverse framework structure of this one phase and shipboard appeared as a result of the structure invalidation, suck can increase slow. Shipboard structure is different the suction of component part can scale, if express,1 is shown. 4, the article is aimed at epilogue ship vessel, the consideration bumps the synchronous injury of boat Shou and structure of side of side be bumpinged into to be out of shape, use nonlinear finite emulation technology studied yuan of numerical value to collide to be out of shape bilaterally injure and suck can characteristic. Consider to make clear, for the shipping of similar to having tonnage and configuration, when producing perpendicular collision, the ministry also absorbed the Shou that strikes a ship to comparative the energy of one part (occupy about always suck can 25% ) , can make the scathing deformation of boat be bumpinged into gets alleviating relatively. CNC Milling