NURBS插補器在DSP-BASED; CNC之設計與實現 Design and Realize the NURBS Interpolator on a DSP-BASED CNC Machine

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Title:	NURBS插補器在DSP-BASED;CNC之設計與實現 Design and Realize the NURBS Interpolator on a DSP-BASED CNC Machine
Authors:	王文志;Wen-Zhi Wang
Contributors:	機械工程研究所
Keywords:	差補器;DSP;NURBS
Date:	2003-07-07
Issue Date:	2009-09-21 11:43:58 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	在現今各項產業中，快速的產品更新、穩定且高效率的產品特性，是在同業中維持競爭力的重要依據，而在CNC工具機產業亦事如此；傳統的CNC工具機都是以PC作為設計基礎，這是由於PC為基礎的加工機，在控制程式開發與控制理論實現方面的簡易性，以及更新程式的便利性，但是當加工機使用者需求增加，例如需要更強大功能，以及更精確的加工能力時，由於受限於PC的整體架構，因此若要達成顧客要求，則新產品必須要更新更快速的硬體，以提昇PC的運算處理能力，但此方法卻有其致命的缺點 - 價格昂貴。在產品的開發中，硬體設備的成本往往佔總成本的極大比例，因此各業者無不盡量以低成本的硬體，來達成高效率的產品，但在傳統的CNC系統架構之下，卻是很難達成此一目標。由於半導體的蓬勃發展，產生出許多功能強大且足以取代PC部分功能的積體電路元件，例如數位訊號處理器(DSP)以及可程式控制邏輯元件(PLD)，此兩樣元件用於工具機系統不但可以大大減輕PC的負擔，並且可以節省許多產品的開發成本，舉例來說先進的工具機系統，有別於傳統的系統，它將計算加工路徑、控制命令之輸出以及訊號回授之動作，交由DSP以及PLD合力完成，而PC端只負責人機介面監控程式以及加工命令之傳遞的基本功能，如此PC端的硬體成本將會大幅的降低，而且拜半導體發展之賜，DSP及PLD元件價格已不在昂貴，而發展成功的關鍵將會是在系統整合之能力，及系統之研發速率。 In today’s CAD/CAM systems, the demand for more complicated shapes in many application areas such as aerospace and automotive industries has promoted many new curve and surface design techniques, and NURBS is one of those. And, the flexibility in programming without change of hardware is one of the significant factors in the controller design of CNC machine tools. Especially, the performance in the maximum attainable tracking speed depends on the computing speed of the control algorithm. Digital control technology and high performance microprocessors enabled control systems for CNC machine tools to be designed flexibly. As a consequence, they can be adapted to the changes in production, so it has become possible to produce new products in a short time. This thesis presents the development of a CNC (Computer Numerical Controller) system with a DSP (Digital Signal Processor) as the motion control CPU and a FPGA (Field Programmable Gate Array) as command output circuit. The machining accuracy of the CNC system on the acceleration/deceleration method and NURBS interpolation method is also investigated.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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