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標題: | 用於人類無毛皮膚觸覺回饋之單邊壓電片懸臂板尺寸最佳化 Optimization of the dimensions of piezoelectric unimorph cantilever plates for tactile feedback in human glabrous skins |
作者: | Chang-Kai Chao 趙張凱 |
指導教授: | 陳湘鳳(Shana Smith) |
關鍵字: | 單邊壓電片懸臂板,頻率響應,觸覺回饋,人類無毛皮膚, piezoelectric unimorph cantilever plate,frequency response,tactile feedback,human glabrous skins, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 智慧科技產品已逐漸小型化、方便攜帶並且更加的人性化,如智慧型手機與平板電腦。這些裝置通常為了節省空間都會省略實體按鍵而只能提供虛擬按鍵,並且以視覺與聽覺來補償回饋。而這種回饋方式常常不能提供良好的使用者經驗。觸覺回饋裝置可提供這些智慧科技產品振動或物理力回饋。但這些觸覺回饋裝置必須體積小、耗電少。另外,這些觸覺回饋裝置若能提供多點、局部的回饋,則可以令使用者有更好的使用經驗。單邊壓電片是一種簡單、體積小且耗電少的致動器,可以做為觸覺回饋裝置的致動器。但有關單邊壓電片作為振動致動器之研究不多,且通常沒有完善的考慮各個尺寸變化對於共振頻率與頻率響應的影響。本研究建立了一個適用於上下層等面積與不等面積之單邊壓電片懸臂板的有限元素法模擬模型,並以多種尺寸的樣品實驗驗證。本研究比較基於Euler-Bernoulli樑理論之單邊壓電片懸臂樑理論方程式、有限元素法模擬、與實驗結果,找出單邊壓電片懸臂板尺寸與其第一共振頻率和位移頻率響應的關係。此模型可以設計適用於振動觸覺回饋裝置的單邊壓電片懸臂板之尺寸,讓第一共振頻率落在人類無毛皮膚敏感振動頻率範圍內,令觸覺回饋裝置提供最佳的回饋效果。 Nowadays, intelligent products are smaller, more portable, and humanized, like smartphones and tablet PCs. These devices usually have virtual buttons instead of physical ones, to save space, and they provide visual and acoustic feedback to compensate. However, current visual and acoustic feedback methods do not provide good user experiences. Tactile devices can provide better user experiences for intelligent products by creating Newtonian forces or vibrations. Tactile devices in portable products need to be small and they need to have low power consumptions. If tactile devices can provide local multi-point feedback, they can provide better user experiences for intelligent products. Unimorphs are a type of simple and small actuator, with lower power consumptions, which are good for creating tactile devices. However, there is little current research related to using unimorphs to create physically detectable vibrations for tactile devices, or about the effects of unimorph sizes on tactile device resonance frequencies and frequency responses. This research study creates a finite element model of a unimorph which can have equal or unequal driver and driven areas. The study also includes experiments for various unimorphs, with various physical dimensions, which are used to verify the finite element model. The study compares the theoretical functions of unimorph cantilever beams, which are based on Euler-Bernoulli beam theory, the results of the finite element analysis, and the results of experiments. The study uses the results to find the relationships between the dimensions of unimorph cantilever plates and the first resonance frequencies and frequency responses of displacements of the plates. The models are then used to select the dimensions of unimorph cantilever plates which have first resonance frequencies in ranges that are sensed by human glabrous skin, so that the unimorph cantilever plate can be used to create tactile device that provide the best tactile feedback. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/18511 |
全文授權: | 未授權 |
顯示於系所單位: | 機械工程學系 |
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ntu-103-1.pdf 目前未授權公開取用 | 4.34 MB | Adobe PDF |
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