2c:null 2d:["$","title",null,{"children":"Section 4.2 Advance Resistance Analysis - Pt.2: Resistance Model | Felipe Ferrari | Observable"}] 32:T42b,md` With propeller information defined in a JSON format, we can continue by using the models wich constitutes the ship resistance [[3]](#three). To define the resistance it is necessary to first inser a sea state, the simplest one with no disturbance can be defined simpling by assigning a Vessel.WaveCreator() to a variable: ~~~~js var wave = new Vessel.WaveCreator(); var hullRes = new Vessel.HullResistance(ship, shipState, propeller, wave); hullRes.writeOutput(); ~~~~ To set the resistance to a specific speed, different from the projected one it must be called the: ~~~~js var v = 10 // A specified value for the speed in knots hullRes.setSpeed(v); ~~~~ The hullRes.calmResitance gives the value for the calm resistance, while the hullRes.totalResistance.Rtadd gives the value for the total resistance accounting for the propeller. In addition the total power requested in the propeller is given by hullRes.totalResistance.Pe. The following example shows the results for the speed of 10 knots: `33:[{"id":"ee03343d3cefa6d9679c0a2fcc917e436fb24c19b6c6d6ec2f5d01da2f12112c71771e5e4db882dd72cad016650a29ba992f8786bd5db576ca391fed86e1dbda","href":"https://static.observableusercontent.com/files/ee03343d3cefa6d9679c0a2fcc917e436fb24c19b6c6d6ec2f5d01da2f12112c71771e5e4db882dd72cad016650a29ba992f8786bd5db576ca391fed86e1dbda","name":"gunnerus.json","type":"application/json","lastModified":1643483615037.975,"size":51661}] 30:{"id":"327a73d5a73f182e","slug":"section-4-2-advance-resistance-analysis-pt-2-resistance-mod","title":"Section 4.2 Advance Resistance Analysis - Pt.2: Resistance Model","thumbnail":"efed1ffb21226c487a206172d586e85069c207f9191b6562ccd0a7ab34aac94b","access_level":"public","create_time":"$D2021-05-01T14:17:34.883Z","update_time":"$D2022-01-29T19:14:26.536Z","view_time":null,"first_public_time":"$D2021-05-01T16:51:08.262Z","fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"d87babdb83b49aab","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":"starter_2024"},"version":193,"publish_version":193,"role":null,"authored":false,"authors":[{"type":"individual","id":"a379b02a7775e50b","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":null}],"members":[{"type":"individual","id":"a379b02a7775e50b","login":"ferrari212","name":"Felipe Ferrari","avatar_url":"https://avatars-next.observableusercontent.com/9f46888d11f1719173b012c1de36ec52e2071ef6ff70202a1748014cd8f31bbd","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":{"id":"ce744f5722745fd3","slug":"from-hull-to-simulation","title":"From Concept to Simulation","owner":{"id":"d87babdb83b49aab","login":"ferrari212","name":"Felipe Ferrari"}},"type":"notebook","body":{"title":"Section 4.2 Advance Resistance Analysis - Pt.2: Resistance Model","cells":[{"id":0,"value":"md`# Section 4.2 Advance Resistance Analysis - Pt.2: Resistance Model`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"$32","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":85,"value":"{\n hullRes.setSpeed(10);\n hullRes.calmResistance;\n hullRes.totalResistance.Rtadd;\n hullRes.totalResistance.Pe;\n return {\n R: hullRes.calmResistance,\n Rtadd: hullRes.totalResistance.Rtadd,\n Pe: hullRes.totalResistance.Pe\n };\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":81,"value":"md`\nThe following graphics shows the value of the resistance according to the speed of the ship in knots\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":136,"value":"chart = {\n const svg = d3.create(\"svg\").attr(\"viewBox\", [0, 0, width, height]);\n\n const labelsObj = [\n { title: \"Rt\", color: \"steelblue\" },\n { title: \"Rtadd\", color: \"green\" }\n ];\n\n svg.append(\"g\").call(xAxis);\n\n svg.append(\"g\").call(yAxis);\n\n // Draw the x and y axes labels.\n svg.append('g').call(xAxisLabel('Speed [knots]'));\n svg.append('g').call(yAxisLabel('Resistance [N]'));\n\n // Draw the x and y axes labels.\n svg.append('g').call(appendLabel(labelsObj));\n\n svg\n .append(\"path\")\n .datum(data)\n .attr(\"fill\", \"none\")\n .attr(\"stroke\", \"steelblue\")\n .attr(\"stroke-width\", 1.5)\n .attr(\"stroke-linejoin\", \"round\")\n .attr(\"stroke-linecap\", \"round\")\n .attr(\"d\", line1);\n\n svg\n .append(\"path\")\n .datum(data)\n .attr(\"fill\", \"none\")\n .attr(\"stroke\", \"green\")\n .attr(\"stroke-width\", 1.5)\n .attr(\"stroke-linejoin\", \"round\")\n .attr(\"stroke-linecap\", \"round\")\n .attr(\"d\", line2);\n\n return svg.node();\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":156,"value":"md`\n

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\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":15,"value":"MutablesModel = md`### Mutable`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":19,"value":"{\n var wave = new Vessel.WaveCreator();\n mutable hullRes = new Vessel.HullResistance(ship, shipState, propeller, wave);\n mutable hullRes.writeOutput();\n\n mutable propellerInteraction = new Vessel.PropellerInteraction(\n ship,\n shipState,\n propeller\n );\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":17,"value":"mutable propellerInteraction = {\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":21,"value":"mutable hullRes = {\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":40,"value":"ThreDModels = md`### Ship Info.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":42,"value":"Gunnerus = FileAttachment(\"gunnerus.json\").json()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":44,"value":"ship = new Vessel.Ship(Gunnerus)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":46,"value":"shipState = new Vessel.ShipState(ship.designState.getSpecification())","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":48,"value":"propeller = d3.json(\n \"https://raw.githubusercontent.com/shiplab/vesseljs/dev/examples/others/propeller_specifications/wag_4b_0.55a_1.2p.json\"\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":94,"value":"GraphModels = md`### Graphics`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":124,"value":"data = {\n let result = [];\n\n var calculateOutput = V => {\n hullRes.setSpeed(V);\n return {\n x: V,\n y: hullRes.calmResistance,\n z: hullRes.totalResistance.Rtadd\n };\n };\n\n let v = 0;\n\n do {\n result.push(calculateOutput(v));\n v = v + 0.01;\n } while (v <= 12.0);\n\n return result;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":97,"value":"line1 = d3\n .line()\n .x(d => x(d.x))\n .y(d => y(d.y))","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":99,"value":"line2 = d3\n .line()\n .x(d => x(d.x))\n .y(d => y(d.z))","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":103,"value":"x = d3\n .scaleLinear()\n .domain(d3.extent(data, d => d.x))\n .range([margin.left, width - margin.right])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":105,"value":"y = d3\n .scaleLinear()\n .domain([0, d3.max(data, d => d3.max([d.z, d.z]))])\n .nice()\n .range([height - margin.bottom, margin.top])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":107,"value":"xAxis = g =>\n g.attr(\"transform\", `translate(0,${height - margin.bottom})`).call(\n d3\n .axisBottom(x)\n .ticks(width / 100)\n .tickSizeOuter(0)\n )","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":142,"value":"xAxisLabel = label => g =>\n g\n .attr('transform', `translate(0,${height - margin.bottom})`)\n // Add label\n .append('text')\n .attr('class', 'axis-label')\n .text(label)\n .attr('x', margin.left + (width - margin.left - margin.right) / 2)\n .attr('y', (margin.bottom * 5) / 6) // Relative to the x axis.","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":109,"value":"yAxis = g =>\n g\n .attr(\"transform\", `translate(${margin.left},0)`)\n .call(d3.axisLeft(y))\n .call(g => g.select(\".domain\").remove())\n .call(g =>\n g\n .select(\".tick:last-of-type text\")\n .clone()\n .attr(\"x\", 3)\n .attr(\"text-anchor\", \"start\")\n .attr(\"font-weight\", \"bold\")\n .text(data.z)\n )\n .call(d3.axisLeft(y).tickSizeOuter(0))","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":144,"value":"yAxisLabel = label => g =>\n g\n .attr('transform', `translate(${margin.left},0)`)\n // Add label\n .append('text')\n .attr('class', 'axis-label')\n .text(label)\n .attr('transform', 'rotate(-90)')\n .attr('x', -(margin.top + (height - margin.top - margin.bottom) / 2))\n .attr('y', (-margin.left * 3) / 4) // Relative to the y axis.","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":111,"value":"margin = ({ top: 20, right: 30, bottom: 50, left: 75 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":113,"value":"height = width / 2","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":115,"value":"appendLabel = e => g => {\n e.forEach((el, i) => {\n g.append(\"circle\")\n .attr(\"cx\", width - 150)\n .attr(\"cy\", .8 * height + 30 * i)\n .attr(\"r\", 6)\n .style(\"fill\", el.color);\n\n g.append(\"text\")\n .attr(\"x\", width - 130)\n .attr(\"y\", .8 * height + 30 * i)\n .text(el.title)\n .style(\"font-size\", \"15px\")\n .attr(\"alignment-baseline\", \"middle\");\n });\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":23,"value":"md`### Libraries`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":25,"value":"THREE = {\n const THREE = (window.THREE = await require(\"three@0.99.0/build/three.min.js\"));\n await require(\"three@0.99.0/examples/js/controls/OrbitControls.js\").catch(\n () => {}\n );\n await require(\"three@0.99.0/examples/js/loaders/STLLoader.js\").catch(\n () => {}\n );\n await require(\"three@0.99.0/examples/js/loaders/GLTFLoader.js\").catch(\n () => {}\n );\n return THREE;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":29,"value":"Vessel = require('ntnu-vessel@0.1.1/vessel.js').catch(() => window[\"Vessel\"])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":32,"value":"d3 = require(\"d3@6\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":35,"value":"legendcolor = require(\"d3-svg-legend\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W33","stdlib":"1","titling":"auto"}} 31:"$30:body"