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第 1 頁 譯文標(biāo)題 基于工程數(shù)據(jù)庫的起重機(jī)結(jié)構(gòu)計(jì)算機(jī)輔助設(shè)計(jì) 原文標(biāo)題 CAD CAM OF CRANE S STRUCTURE BASED ON ENGINEERING DATABASE 作 者 Chonghua Wang 譯 名 王重華 國 籍 中國 原文出處 Department of Mechanical Engineering Shanghai Maritime University P R China e mail spmtc 第 2 頁 譯文 基于工程數(shù)據(jù)庫的起重機(jī)結(jié)構(gòu)計(jì)算機(jī)輔助設(shè)計(jì) 摘要根據(jù)大型復(fù)雜結(jié)構(gòu)機(jī)械 CAD CAM 專業(yè) 根據(jù)起重機(jī)的結(jié)構(gòu)工程數(shù)據(jù)庫的 CAD CAM 系統(tǒng)是本文提出的 基于自頂向下的層次結(jié)構(gòu) 特征技術(shù) 裝配約束關(guān) 系 自下而上的裝配工藝和向下到頂部尺寸約束關(guān)系 建立了一個(gè)三維參數(shù)化模型 族的計(jì)算機(jī)輔助設(shè)計(jì)平臺(tái) 允許生成可行的配置的起重機(jī)結(jié)構(gòu) 一個(gè)總結(jié)的 GUI 和 ANSYS 的 APDL 圖案的背景知識(shí) 起重機(jī)的有限元模型是基于組合模式的建立 實(shí)現(xiàn) 了有限元模型的同步更新和分析 在系統(tǒng)中構(gòu)建了 2 種工程數(shù)據(jù)庫 一個(gè)是參數(shù)化 的數(shù)據(jù)庫 包含了各種參數(shù)化的零件和部件 常用于起重機(jī)結(jié)構(gòu) 另一種是針對(duì)每 一個(gè)單獨(dú)的起重機(jī)而設(shè)計(jì)的 其中包括用于起重機(jī)結(jié)構(gòu)的所有部件和部件 其中參 數(shù)化的變量被確定的值所代替 以后可以用來創(chuàng)建 BOM 建立有限元模型 安排零 件在數(shù)控切割鋼板 焊接和制造工藝裝置設(shè)計(jì) 微軟 SQL 服務(wù)器選擇構(gòu)建數(shù)據(jù)庫和 CAD CAM 集成是使用 MS VC 6 和 Pro TOOLKIT 實(shí)現(xiàn) 關(guān)鍵詞計(jì)算機(jī)輔助設(shè)計(jì) 凸輪 結(jié)構(gòu) 起重機(jī) 工程數(shù)據(jù)庫 三維設(shè)計(jì) 1 在過去的幾十年里 國際貿(mào)易迅速增長(zhǎng) 這依賴于世界物流的運(yùn)輸鏈 深水 港的能力 迅速處理和分發(fā)大量的集裝箱和貨物 這是在 在物流鏈中不斷發(fā)揮關(guān)鍵作用 現(xiàn)在世界上幾乎所有的港口都在忙著擴(kuò)張 港 口起重機(jī)在最近幾年迅速增長(zhǎng) 港口起重機(jī)是非常大的 復(fù)雜的機(jī)器 越來越大 更自動(dòng)化 更高的速度 以滿足巨大的船舶和大量的負(fù)載和卸載 與一般的機(jī)器相 比 它具有一個(gè)獨(dú)特的組成部分 它是一個(gè)巨大且復(fù)雜的結(jié)構(gòu) 起重機(jī)結(jié)構(gòu)的計(jì)算 機(jī)輔助設(shè)計(jì) 凸輪機(jī)構(gòu)的特點(diǎn)是 起重機(jī)的結(jié)構(gòu)型式和設(shè)計(jì)參數(shù) 滿足各種不同的自 然 環(huán)境和運(yùn)行條件的設(shè)計(jì)參數(shù) 結(jié)構(gòu)由幾個(gè)部件組成 每一個(gè)部件都是由焊接而 成的 雖然很多零件都是矩形板 但它們的厚度可以隨構(gòu)件的變化而不斷變化 以 減輕重量 同時(shí)保持足夠的強(qiáng)度 此外 有大量的結(jié)構(gòu)細(xì)節(jié) 讓組件支持外部負(fù)載 因此 該組件是非常復(fù)雜的 C 的結(jié)構(gòu)設(shè)計(jì)應(yīng)符合強(qiáng)度 穩(wěn)定性等要求 補(bǔ)償?shù)臉?biāo) 準(zhǔn)和規(guī)范 累積損傷和振動(dòng)頻率等 因此有必要對(duì)結(jié)構(gòu)進(jìn)行有限元分析 由于結(jié)構(gòu) 非常大 復(fù)雜 任何有限元軟件包的商業(yè)計(jì)算機(jī)輔助設(shè)計(jì)軟件是不夠的 以處理復(fù) 雜結(jié)構(gòu)的起重機(jī) 起重機(jī)結(jié)構(gòu)凸輪的技術(shù)比較簡(jiǎn)單 特別是數(shù)控切割和自動(dòng)焊接在 大多數(shù)工廠都有廣泛的應(yīng)用 本文提出了起重機(jī)結(jié)構(gòu)的計(jì)算機(jī)輔助設(shè)計(jì) 計(jì)算機(jī)輔助 設(shè)計(jì) 它主要是基于程序的計(jì)算機(jī)與參數(shù)化三維建模技術(shù) 有限元分析 工程數(shù)據(jù) 庫技術(shù) Pro E ANSYS MS Visual C 和微軟 SQL Server 該系統(tǒng)包括建立起重 機(jī)械三維參數(shù)化模型族的計(jì)算機(jī)輔助設(shè)計(jì)平臺(tái) 建立有限元模型 二次開發(fā)的三維 第 3 頁 參數(shù)化模型 同步更新和有限元分析 參數(shù)化和若干模型的構(gòu)造和收集信息 組件 和起重機(jī)的應(yīng)用和供應(yīng)平臺(tái) 2 為了支持起重機(jī)設(shè)計(jì)的計(jì)算機(jī)輔助設(shè)計(jì)平臺(tái) 設(shè)計(jì)了起重機(jī)的三維參數(shù)化模 型 為每個(gè)家庭成員提供了一種可行的起重機(jī) 部件和部件的配置 然后將它們縮 放到期望的尺寸 港口集裝箱起重機(jī)計(jì)算機(jī)輔助設(shè)計(jì)模型平臺(tái)的框架 為港口集裝 箱起重機(jī)提供支持功能 2 1 分解成零部件和零部件的基礎(chǔ)上的自頂向下的層次結(jié)構(gòu)的產(chǎn)品結(jié)構(gòu) 能夠 方便的設(shè)計(jì)任務(wù)的開發(fā)團(tuán)隊(duì)的成員 一個(gè)起重機(jī)的設(shè)計(jì)必須以某種方式結(jié)構(gòu)化 著 名的層次結(jié)構(gòu)的產(chǎn)品結(jié)構(gòu)是用于此 起重機(jī)由若干部件組成 每個(gè)組件可以包含若 干子或一部分 第一種類型的組件被稱為復(fù)合組件 在下面的文本 我們只稱之為 組件 第二類是一個(gè)單一的組件 我們稱之為下面的一部分 該產(chǎn)品結(jié)構(gòu)以這種 方式持續(xù)下去 直到所有的組件在層次結(jié)構(gòu)中的最低水平 因此 產(chǎn)品是結(jié)構(gòu)化的 自上而下的方式 創(chuàng)造盡可能多的層次 如所需的設(shè)計(jì)師 圖 1 顯示了一個(gè)簡(jiǎn)化的 集裝箱起重機(jī)的層次結(jié)構(gòu) 2 2 構(gòu)建了基于特征技術(shù)特征技術(shù)的 CAD 軟件平臺(tái)如 Pro Engineer 提供的三 維零件模型 SolidWorks 等包括 a 草案的特點(diǎn) 基本幾何特征繪制截面拉伸 旋轉(zhuǎn)或掃描 b 附件的功能被添加到基本特征包括孔 圓角 塌角等 根據(jù)上述特 征技術(shù) 生成集裝箱起重機(jī)零件的三維模型 2 3 指定組件的空間約束關(guān)系 以創(chuàng)建產(chǎn)品種類的組件和組件之間的空間關(guān)系 在產(chǎn)品族中的代表使用裝配約束關(guān)系 在計(jì)算機(jī)輔助設(shè)計(jì)軟件的裝配模塊中 如支 持 工程 裝配等約束關(guān)系 如匹配 對(duì)準(zhǔn) 插入和切向等 在這里 根據(jù)起重機(jī)的 層次結(jié)構(gòu) 零部件和組件之間的關(guān)系是建立使用裝配約束提供的專業(yè) 工程師 圖 2 表示門戶框架中的組件之間的裝配約束關(guān)系 2 4 為了使零件 零部件和起重機(jī)的設(shè)計(jì)參數(shù)發(fā)生改變時(shí) 為了使零件 部件 和起重機(jī)的新的三維模型發(fā)生改變 從而建立起到頂部尺寸約束關(guān)系 從而建立零 件或部件的設(shè)計(jì)參數(shù) 設(shè)計(jì)參數(shù)由設(shè)計(jì)人員根據(jù)零件或部件的結(jié)構(gòu)設(shè)計(jì) 尺寸變量 這是自動(dòng)生成時(shí) 三維模型的零件或組件 控制真正的幾何尺寸和拓?fù)潢P(guān)系的一部 分或一個(gè)組件 因此 為了使設(shè)計(jì)參數(shù)發(fā)生變化時(shí) 零件 部件或吊車的精確的新 模型得到改變 應(yīng)準(zhǔn)確構(gòu)造設(shè)計(jì)參數(shù)和尺寸變量之間的關(guān)系 商業(yè)計(jì)算機(jī)輔助設(shè)計(jì) 軟件 如專業(yè) 工程師提供的功能 建立設(shè)計(jì)參數(shù)和設(shè)計(jì)參數(shù)和尺寸變量之間的關(guān)系 必須指出的是 每一部分都將被用來組成一個(gè)組件 所有的引用而不是對(duì)部分實(shí)體 將失效 必須重新開業(yè) 因此 重要的是要設(shè)置所有的參數(shù)的模型的一部分 2 5 部件或產(chǎn)品的裝配約束關(guān)系的基礎(chǔ)上 根據(jù)起重機(jī)的層次結(jié)構(gòu)模型自下而 上的方式產(chǎn)生的 一個(gè)設(shè)計(jì)師能盡快的任務(wù)已經(jīng)分配給他開始建立零件三維模型 第 4 頁 另一方面 三維建模組件設(shè)計(jì)器所獲分配只能在其子組件和零件已創(chuàng)建啟動(dòng) 因此 實(shí)際的建模活動(dòng)是自下而上的過程 從層次結(jié)構(gòu)的產(chǎn)品結(jié)構(gòu)的葉子開始 根據(jù)起重 機(jī)的層次結(jié)構(gòu)和組件和零件之間的裝配約束關(guān)系 生成了零件的三維模型 對(duì)零件 模型的參數(shù)進(jìn)行評(píng)估 并在組裝前進(jìn)行修改一個(gè)組件 如果有必要修改部分后 它 已被組裝 應(yīng)刪除部分和一個(gè)新的模型的部分進(jìn)行評(píng)估 以適當(dāng)?shù)膬r(jià)值和被組裝 所有的設(shè)計(jì)參數(shù)必須在部件或組件的模型上設(shè)置 無設(shè)計(jì)參數(shù)是在系統(tǒng)中的起重機(jī) 裝配模型上設(shè)置 以避免在任何參數(shù)發(fā)生改變后 在整個(gè)起重機(jī)模型再生故障 圖 3 顯示了基于組件和零件之間的約束關(guān)系的繁榮的三維裝配模型 圖 4 和圖 5 基于 裝配約束關(guān)系的子組件和零件之間不同的門戶框架顯示 3D 模型 3 有限元分析中的有限元分析模型的生成 數(shù)學(xué)模型應(yīng)盡可能準(zhǔn)確地模擬真實(shí) 物體 載荷和約束條件 得到可靠的結(jié)果 在整個(gè)起重機(jī)結(jié)構(gòu)上 應(yīng)進(jìn)行有限元分 析 由于結(jié)構(gòu)非常大 復(fù)雜 任何有限元軟件包的商業(yè)計(jì)算機(jī)輔助設(shè)計(jì)軟件是不夠 的 以滿足任務(wù) ANSYS 是選中是因?yàn)槠鋸?qiáng)大的分析功能 同樣的道理 在 ANSYS 中不能采用板單元 Beam188 單元的建立起重機(jī)有限元模型 在 ANSYS 中 兩種建 模模式提供了建立有限元模型 即人機(jī)交互模式也叫 GUI 模式和命令流輸入模式也 被稱為 APDL 模式 雙模式也有優(yōu)點(diǎn)和缺點(diǎn) 這是在參考文獻(xiàn)中描述 一個(gè)總結(jié)的 GUI 和 ANSYS 的 APDL 圖案的背景知識(shí) 起重機(jī)的有限元模型是基于組合模式的建立 首先 對(duì)起重機(jī)有限元模型可以通過 ANSYS 的 GUI 模式構(gòu)建 第二 CAE 分析起重 機(jī)進(jìn)行相應(yīng)的日志文件也產(chǎn)生 日志文件可以通過使用 ANSYS APDL 參數(shù)化設(shè)計(jì)語言 所提供的一些變化后 已在部分修訂 組件或起重機(jī) 該起重機(jī)包括生成模型的 APDL 載荷和約束的施加 建立了有限元求解 后處 理 生成的模型由參數(shù)定義 節(jié)點(diǎn) 單元 節(jié)建立有限元分析模型等新的起重機(jī)是通 過運(yùn)行 APDL 文件構(gòu)造 實(shí)現(xiàn)了有限元模型的同步更新和分析 參見圖 6 和 7 的有限 元模型和應(yīng)力分析圖的起重機(jī)結(jié)構(gòu) 4 數(shù)據(jù)庫系統(tǒng)是為了管理起重機(jī)的設(shè)計(jì)與制造的所有信息 實(shí)現(xiàn)數(shù)據(jù)共享 由 計(jì)算機(jī)輔助設(shè)計(jì) 凸輪集成系統(tǒng)的各個(gè)模塊共享 使程序獨(dú)立于數(shù)據(jù) 保證數(shù)據(jù)的完 整性和安全性 必須采用數(shù)據(jù)庫系統(tǒng) 在流行的數(shù)據(jù)庫管理系統(tǒng)微機(jī)如 FoxPro Visual Foxpro SQL Server 等 微軟 SQL Server 2000 是最后的選擇 4 1 為了 GDB 和深發(fā)展加快設(shè)計(jì) 提高設(shè)計(jì)質(zhì)量 減少重復(fù)工作 兩種數(shù)據(jù)庫 是系統(tǒng)設(shè)計(jì) 一個(gè)被稱為通用數(shù)據(jù)庫 GDB 其他特殊的數(shù)據(jù)庫 SDB 個(gè)人起重機(jī) GDB 是一個(gè)參數(shù)化的數(shù)據(jù)庫 包括各種參數(shù)化零件和常用的起重機(jī)結(jié)構(gòu)組成 部件 和組件被存儲(chǔ)在多個(gè)分支和層次 作為一個(gè)樹結(jié)構(gòu) 雖然有可能是大量的矩形板的 一個(gè)組成部分 例如 在繁榮 在梁 只有一個(gè)參數(shù)化的矩形板在每一個(gè)分支 以減少冗余 GDB 可以被所有設(shè)計(jì)師的公司參觀 當(dāng)一個(gè)設(shè)計(jì)師給設(shè)計(jì)的一個(gè)組成部分 他可以先搜索 gdb 的相應(yīng)部門利用現(xiàn)有 第 5 頁 的參數(shù)化零部件和組件的三維模型構(gòu)建 同時(shí) 信息的零件和部件的使用記錄在 SDB 他可以修改在 GDB 的零部件如果他們稍有不同 從什么是需要的 他甚至可以 創(chuàng)建一個(gè)新的參數(shù)化零件和組件并將它們保存到 GDB 的機(jī)關(guān)批準(zhǔn) SDB 是專為每一個(gè)個(gè)體的起重機(jī)和包含所有零部件用于起重機(jī)結(jié)構(gòu) 它們也存 儲(chǔ)在一個(gè)樹結(jié)構(gòu)中 不同于 GDB 每一部分都有相應(yīng)的記錄 在深發(fā)展 參數(shù)化變 量被確定值替換 隨著這些 代碼 名稱 存儲(chǔ)位置 位置 材料 重量 重心 制造等參數(shù)的參數(shù) 一些數(shù)據(jù) 例如重量的一部分 計(jì)算的一部分已被縮放 SDB 可以用來創(chuàng)建 BOM 建立有限元模型 安排零件在數(shù)控切割鋼板 焊接和制 造工藝裝置設(shè)計(jì) 4 2 數(shù)據(jù)庫結(jié)構(gòu)與數(shù)據(jù)庫的使用 一些一般性的問題將被解決 數(shù)據(jù)完整性 在一個(gè)文件系統(tǒng)中 設(shè)計(jì)師誰保存的文件的變化 然后刪除由設(shè)計(jì)師誰保存的文件 之后 但同時(shí) 采用數(shù)據(jù)庫的交易機(jī)制 在同一時(shí)間 一個(gè)計(jì)算機(jī)輔助設(shè)計(jì)模型不 能同時(shí)進(jìn)行修改 直接關(guān)系 模型的數(shù)據(jù)實(shí)體的直接關(guān)系 三維模型之間的技術(shù)依 賴關(guān)系可以很容易地發(fā)現(xiàn) 直接關(guān)系給設(shè)計(jì)者一個(gè)提示 在模型的改變之后 模型 也必須改變 中心數(shù)據(jù)管理 數(shù)據(jù)中心庫提供備份和版本控制的幾個(gè)優(yōu)點(diǎn) 數(shù)據(jù)聚 類 數(shù)據(jù)的聚類速度的數(shù)據(jù)訪問 因?yàn)槊總€(gè)設(shè)計(jì)師可以得到所需的信息 在他的本 地 PC 這是非常重要的分布式和協(xié)同設(shè)計(jì)項(xiàng)目 我們已經(jīng)使用了實(shí)體關(guān)系 二 模 型 這是一個(gè)流行的高層次的概念數(shù)據(jù)模型 設(shè)計(jì)數(shù)據(jù)庫 這種模式及其變化經(jīng)常 被用于數(shù)據(jù)庫應(yīng)用程序的概念設(shè)計(jì) 和許多數(shù)據(jù)庫設(shè)計(jì)工具采用其概念 二型模型 描述數(shù)據(jù)的實(shí)體 關(guān)系和屬性 二型代表是一個(gè)實(shí)體 它是現(xiàn)實(shí)世界中的一個(gè)獨(dú)立 存在的基本對(duì)象 每個(gè)實(shí)體都有屬性 即描述它的特定屬性 一個(gè)特定的實(shí)體將有 一個(gè)值的每個(gè)屬性 描述每個(gè)實(shí)體的屬性值成為存儲(chǔ)在數(shù)據(jù)庫中的數(shù)據(jù)的一個(gè)重要 部分 一個(gè)關(guān)系型 R 在 n 個(gè)實(shí)體類型 E1 E2 恩定義的關(guān)聯(lián)或關(guān)系集從這些類型的 實(shí)體之間的 實(shí)體類型和實(shí)體集的關(guān)系類型及其對(duì)應(yīng)關(guān)系設(shè)置統(tǒng)稱同名的 R 根據(jù)起重機(jī)的層次結(jié)構(gòu) 數(shù)據(jù)庫具有實(shí)體 每一部分 組件和起重機(jī)可以被表 示為一個(gè)實(shí)體 它具有設(shè)計(jì)參數(shù)描述的屬性 在起重機(jī)產(chǎn)品零部件之間的空間關(guān)系 表示為關(guān)系集 R 的數(shù)據(jù)庫采用微軟 SQL Server 和組件對(duì)象模型 COM 5 CAD CAM 集成的基于 Visual C 和 SQL Server 數(shù)據(jù)庫管理系統(tǒng)作為管理工 程數(shù)據(jù)庫和 Pro ENGINEER 用于建立三維模型 采用 Visual C 作為 編程語言構(gòu)建計(jì)算機(jī)輔助設(shè)計(jì) 凸輪的整體系統(tǒng) 第一個(gè)原因是 Visual C 是 一個(gè)可以訪問 SQL 數(shù)據(jù)庫語言 其次 當(dāng)我們?cè)O(shè)置 GDB 必須訪問數(shù)據(jù)庫以及訪問的 三維模型 利用 Pro TOOLKIT 這是第二利用 Pro ENGINEER 提供的軟件包 當(dāng)我們 處理的是深發(fā)展 我們也需要訪問數(shù)據(jù)庫和參數(shù)化模型的同時(shí) 做一些修改 Visual C 是強(qiáng)大的編譯程序能訪問 Pro Engineer 和 SQL Server 2000 的同時(shí) 實(shí) 第 6 頁 現(xiàn)它們之間的數(shù)據(jù)通信 第三 Visual C 是一種面向?qū)ο蟮木幊誊浖性S多優(yōu)點(diǎn) 6 本文介紹了基于工程數(shù)據(jù)庫的集裝箱起重機(jī)結(jié)構(gòu)計(jì)算機(jī)輔助設(shè)計(jì) 凸輪一體 化系統(tǒng)的設(shè)計(jì) 基于自上而下的層次化的產(chǎn)品結(jié)構(gòu) 特征技術(shù) 裝配約束關(guān)系 利 用 Pro ENGINEER 提供的自底向上的裝配工藝和尺寸關(guān)系到頂部 一個(gè)三維參數(shù)化模 型的 CAD 平臺(tái)的建立是為了讓家庭的起重機(jī)的可行的配置生成 一個(gè)總結(jié)的 GUI 和 ANSYS 軟件 APDL 圖案的背景知識(shí) 基于復(fù)合模式建立了該橋的有限元模型 實(shí)現(xiàn)了 有限元模型的同步更新和分析 利用微軟 SQL Server 2000 兩種數(shù)據(jù)庫是系統(tǒng)與 CAD CAM 集成系統(tǒng)的各個(gè)模塊進(jìn)行設(shè)計(jì) 數(shù)據(jù)共享整個(gè)系統(tǒng) 以 Visual C 的幫助 下 實(shí)現(xiàn)了 CAD CAM 的集成開發(fā)方法 該系統(tǒng)可以大大提高港口集裝箱起重機(jī)結(jié)構(gòu) 設(shè)計(jì)效率和開發(fā)凸輪機(jī)械結(jié)構(gòu)復(fù)雜的大型結(jié)構(gòu)的應(yīng)用提供一個(gè)平臺(tái) 致謝本文受上海市重點(diǎn)學(xué)科建設(shè)項(xiàng)目 資助號(hào) T0601 引用 Chandrupatla T and Belegundu A 1991 Introduction to Finite Elements in Engineering Prentice Hall Claesson A Johannesson H and Gedell S 2001 Platform Product Development Product Model a System Structure Composed of Configurable Components Proc 2001 ASME DETC CIE Conference Pittsburgh ASME New York ASME Paper No DETC2001 DTM 21714 Conner C G De Kroon J P and Mistree F 1999 A Product Variety Tradeoff Evaluation Method for a Family of Cordless Drill Transmissions Proc 1999 ASME DETC CIE Conference Las Vegas ASME New York ASME Paper No DETC99 DAC 8625 Martin M V and Ishii K 2002 Design for Variety Developing Standardized and Modularized Product Platform Architectures Res Eng Des 13 4 pp 213 235 Meyer M H and Utterback J M 1993 The Product Family and the Dynamics of Core Capability Sloan Manage Rev 34 3 pp 29 47 Nayak R U Chen W and Simpson T W 2002 A Variation Based Method for Product Family Design Eng Optimiz 34 1 pp 65 81 Peak R S 2003 Characterizing Fine Grained Associatively Gaps A Preliminary Study of CADCAE Model Inter operability Proc 2003 ASME DETC CIE Conference Chicago ASME Paper number CIE48232 Simpson T W Maier J R A and Mistree F 2001 Product 第 7 頁 Platform Design Method and Application Res Eng Des 13 1 pp 2 22 Siddique Z and Rosen D W 1999 Product Platform Design A Graph Grammar Approach Proc 1999 ASME DETC CIE Conference Las Vegas ASME New York ASME Paper No DETC99 DTM 8762 Siddique Z and Rosen D W 2001 On Discrete Design Spaces for the Configuration Design of Product Families AI EDAM 15 2 pp 91 108 Steffen Dennis Graham and Gary 2004 Inside Pro ENGINEER Wildfire Thomson Delmar Learning VRML Consortium 1997 The Virtual Reality Modeling Language International Standard ISO IEC DIS 14772 1 原文 LathesCAD CAM OF CRANE S STRUCTURE BASED ON ENGINEERING DATABASE ABSTRACT According to the specialties of CAD CAM for largescale complex structures of machinery a CAD CAM system based on engineering database for crane s structures is proposed in this paper Based on the top down hierarchical product structure feature technology assembly constraint relationship bottom up assembly process and down to top dimension constraint relationship a CAD platform of 3D parametric model family is built to allow generation of feasible configurations of crane structures With a sum up of background knowledge of GUI and APDL patterns of ANSYS the finite element model of the crane is set up based on composite pattern Synchronous updating and analysis of FEA model are realized Two kinds of engineering databases are constructed in the system One is a parameterized database and contains all kinds of parameterized parts and components common used in crane structures Another is designed for every individual crane and contains all parts and components used in crane structure where parameterized variables are replaced by definite values The later can be used to create BOM to build FEM model to arrange parts in the steel sheet for numerical control cutting and to design technological apparatus for welding and manufacture Microsoft SQL 第 8 頁 Server is selected to construct the databases and the CAD CAM integration is achieved using MS VC 6 0 and Pro TOOLKIT KEYWORDS CAD CAM Structure Crane Engineering database 3D design 1 INTRODUCTION The international trades which increase rapidly in the last few decades rely on the transportation chains of world logistics The abilities of the deepwater ports to swiftly handle and distribute the large quantity of containers and goods which are surging in continuously play a key role in the logistics chains Almost all ports in the world are busy expanding nowadays The port cranes increase rapidly all over the world in the recent years The port cranes are very large and complex machines and becoming larger more automatic and with higher speeds to meet the huge ships and the great quantity of load and unload Comparing with normal machines it has a unique component that is the huge and complicated structure The characters of CAD CAM for crane s structure are a Crane s structure has various types and a lot of design parameters to meet the different natural environmental and operating conditions of every harbor b The structure is consisted of several components Every component is formed by welding numerous parts Although a lot of parts are rectangle plates their thickness may vary continually along the component to reduce the weight while keeping enough strength In addition there are lots of construct details to let the component support external loads So the components are very complicated c The design of the structure should conform to the requirements about strength stability bucking cumulative damage and vibration frequency etc of the Standards and Specifications So it is necessary to do finite element analysis on the structure As the structure is very large and complex any FEA package of commercial CAD software is insufficient to handle the complex structures of crane d The techniques of CAM for crane structure are comparatively simple Especially numerical control cutting and automatic welding are widely used in most factories An integrated CAD CAM for the crane s structure is proposed in this paper It is mainly based on the technologies of parametric 3D modeling finite element analysis engineering database technique Pro ENGINEER ANSYS MS Visual C and Microsoft SQL Server The system includes building CAD platform of 3D parametric model family for crane setting up FEA model the second exploiting of 3D parametric model the synchronous updating and analysis of FEA construction and collection information of parametric and certain models of parts components and cranes and supply a platform to develop the application of CAM 2 CAD PLATFORM OF 3D PARAMETRIC MODEL FAMILY FOR CRANE In order to support the designing of crane family CAD representations for product platform is developed to allow generation of feasible configurations of cranes components and parts 第 9 頁 for each family member and then scaling them to the desired size The framework of CAD model platform for port container crane has to provide support functions listed as follows 2 1 Decompose crane into components and parts based on top down hierarchical product structure To be able to facilitate design tasks to the members of a development team a crane to be designed has to be structured in some way The well known hierarchical product structure is used for this A crane consists of a number of components Each component can either consist of a number of subcomponents or be a part The first type of component is called a compound component in following text we only call it as component the second type a single component we call it as part below The product structuring continues recursively in this way until all components at the lowest level in the hierarchy are parts So the product is structured in a top down way creating as many levels as desired by the designers Figure 1 shows a simplified hierarchical product structure of a container crane 2 2 Construct 3D part model based on feature technology Feature technology provided by CAD software platform such as Pro ENGINEER Solidworks etc includes a Draft features which are fundamental geometry characters produced by drawing cross sections and stretching rotating or scanning them b Attachment features which are added to the fundamental characters include hole round corner collapse corner and so on According to the feature technology describes above the 3D models of the parts of the container crane are generated 2 3 Specify spatial constraint relationships of components to create product variety The spatial relationships among the components and parts in the product family are represented using assembly constraint relationship In the assembly module of CAD software such as Pro ENGINEER constraint relationships in assembling for example matching aligning inserting and tangential etc are provided Here based on the hierarchical structure of crane relationships among parts and components are built using the assembly constraints provide by Pro ENGINEER Figure 2 represents the assembly constraint relationships among the parts of portal frame 2 4 Establishment of down to top size constraint relationship In order to regenerate the new 3D model of parts components and crane when the values of design parameters are changed a down to top size constraint relationships between size variables and design parameters in a part or component should be built Design parameters are established by designers according to the structure of part or component Size variables which are generated automatically when 3D models of parts or components are built control the real geometrical size and topological relationship of a part or a component Therefore in order to regenerated the accurate new model of a part a component or crane when the values of design parameters are changed the relationship between design 第 10 頁 parameters and size variables should be constructed accurately Commercial CAD software such as Pro ENGINEER has provided function to set up design parameters and build relationships between design parameters and size variables It must be pointed out that every part would be used to compose a component All the references which are not on the entity of the part would be invalidated then and must be setting up again So it is important to setting all the references of parameters on the model of the part 2 5 Generation of component or product assembly model based on constraint relationships in bottomup way Based on the hierarchical structure of the crane a designer can start building 3D model of a part as soon as the task has been assigned to him On the other hand 3D modeling of a component by a designer to whom it was assigned can only start just after its subcomponents and parts have been created So the actual modeling activity is bottom up process starting at the leaves of the hierarchical product structure According to the hierarchical product structure of the crane and assembly constraint relationships among components and parts 3D models of a component desired are generated The parameters on the model of a part should be evaluated and can be modified before it is assembled to a component If it is necessary to amend the part after it has been assembled the part should be deleted and a new model of the part is evaluated to the proper values and to be assembled All design parameters must be setting on the models for parts or components No design parameter is setting on the assembling model of the crane in the system to avoid failure in regenerating the model of whole crane after any parameter has changed Figure 3 shows the 3D assembly model of the boom based on constraint relationships among subcomponents and parts Figure 4 and 5 show 3D models of different portal frames based on assembly constraint relationships among subcomponents and parts 3 GENERATION OF FEA MODEL FOR THE CRANE In finite element analysis the mathematical model shall simulate the real object loads and constraints as accurately as possible to get the reliable results The FEA should usually be carried out on the whole crane structure As the structures are very large and complex any FEA package of commercial CAD software is insufficient to fulfill the task The ANSYS is selected because of its powerful structural analysis functions As the same reason the plate elements in ANSYS could not be adopted The beam188 elements are used to build the FEA model of the crane In ANSYS two modeling patterns are provided to build the FEA model i e the human machine interactive pattern also called GUI pattern and the command stream flow input pattern also known as APDL pattern Two patterns have also advantages and shortcomings which are described in reference literature With a sum up of background knowledge of GUI and APDL patterns of ANSYS the FEA model of the crane 第 11 頁 is built based on composite pattern First FEA model of the crane can be built through ANSYS GUI pattern Second CAE analyses of the crane are carried out and corresponding log file is also generated The log file can be amended by using parametric design language APDL provide by ANSYS after some changes have been made on the parts components or crane The APDL of the crane including generation of model imposing of load and constraint finite unit solution and post treatment is built Generation of model consists of parameter definition node unit section establishment etc A new FEA model of the crane is constructed by running the APDL file Synchronous updating and analysis of FEA model are realized See Figure 6 and 7 for the FEA model and stress analysis chart of a crane structure 4 DATABASE SYSTEM In order to manage all the information about design and manufacture of crane achieve the data to be shared by every module of CAD CAM integration system keep the programs independent from the data and guarantee the data integrality and security the database system must be used Among the popular database management systems for microcomputer such as FoxPro Visual FoxPro SQL Server and so on Microsoft SQL Server 2000 is final selected 4 1 GDB and SDB In order to speed up design improve design quality and reduce repeat work two kinds of databases are designed in the system One is called general database GDB The others are special databases SDB for individual cranes The GDB is a parameterized database and contains all kinds of parameterized parts and components common used in crane structures The parts and components are stored in many branches and levels as a tree structure Although there may be lots of rectangular plates in a component for example in the boom in the girder There is only one parameterized rectangular plate in every branch to reduce redundancy The GDB can be visited by all designers of the company As soon as a designer is assigned to design a component he can first search the corresponding branch of GDB to make use of the existing parameterized parts and components to building 3D model of the component At the same time the information of the parts and components used are recorded in the SDB He can modify the parts and components in GDB if they are slightly different from what are needed Even he can create a new parameterized part and component and save them into GDB with the approval of an au