交替式氣墊床用空氣幫浦之最佳化設計

Optimum Design on Alternating Mattress of Air Pump

羅貴瀧(Keui-Lung Lo)

指導教授 ： 韓麗龍

國立臺北科技大學/機電學院/機電整合研究所/碩士(2008年)

摘要

交替式氣墊床(alternating mattress)是應用於長期臥病在床的病患，具有預防褥瘡(ulcer)的功能，其原理是利用空氣幫浦(air pump)作為充氣源。褥瘡的預防工作必須持續不斷進行，才能有效的讓病患免於褥瘡的威脅；因此交替式氣墊床所使用之空氣幫浦在連續運轉時，必須具備壽命長、耗能低的特性，目前市場上普遍均採用電磁隔膜式(magnetic diaphragm)空氣幫浦。
本論文是針對電磁隔膜式空氣幫浦之設計改良作研究，空氣幫浦的品質特性包括：輸出壓力、流量與消耗功率。為了獲得最佳品質特性，有四個設計因子必須考量：活塞帽外型、活塞帽材質、活塞帽硬度、電磁線圈的線徑與匝數。
本研究的實驗設計，首先係以實際產品開發設計流程，製作出產品雛型；再依此產品雛型採用田口方法(Taguchi methods)及L9(34)直交表(orthogonal arrays)，分別針對：(a)輸出壓力(望目特性)，(b)流量(望大特性)，以及(c)消耗功率(望小特性)等品質特性進行實驗分析。最後針對各品質特性藉由實驗分析結果，算出信號雜音比(signal to noise ratio, S/N)及各因子反應表，並且透過變異分析(analysis of variance, ANOVA)評估實驗誤差，同時在修正設計後作實驗確認，找出最佳參數組合。
實驗結果顯示，各控制因子最佳組合為：活塞帽外型為型式一，活塞帽材質為EPDM，活塞帽硬度為Hs50，電磁線圈的線徑與匝數分別為ψ0.19及3500匝。

關鍵字

交替式氣墊床 ； 褥瘡 ； 空氣幫浦 ； 田口方法 ； 信號雜音比 ； 變異分析

並列摘要

The application of alternating mattress is to prevent ulcer for patients who are confined to the bed a long time. Air pumps can be used in mattress system for air inflation. The preventions of ulcer for patients are proceeding continuously to avoid ulcer occurs. Therefore, mattress systems must provide long life and energy conservation. The magnetic diaphragm type of air pump is most popular on the market.
This paper is to develop the improvements of magnetic-diaphragm air pump. The qualities of air pump include output pressure, flow rate, and power consumption. To obtain the best quality characteristics, four designing factors must be considered, i.e., piston rubber type, piston rubber material, piston rubber hardness, and the wire diameters and turns of magnetic coil.
In this study, experimental design for a start is to fabricate a prototype of the air pump. Then, Taguchi methods and L9(34) orthogonal arrays were employed to analysis the output pressure (nominal-the-best characteristics), flow rate (larger-the-better characteristics), power consumption (smaller-the-better characteristics). Lastly, each quality characteristics, such as signal to noise ratio (S/N) and factor’s response table, can be evaluated with the analytic results. The experimental error also can be estimated by using analysis of variance (ANOVA). The revised design was also introduced for experimental confirm and developed the optimal parameters.
Results show the optimal combination of control factors are: piston rubber is type I, piston rubber material is EPDM, piston rubber hardness is Hs50, and the wire diameters and turns of magnetic coil areψ0.19*3500 turns.

並列關鍵字

Alternating mattress ； ulcer ； air pump ； Taguchi methods ； signal to noise ratio ； analysis of variance (ANOVA)

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