全國中小學科展

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工程學

A New Approach to Recycling Aluminum/Iron Cans

本次研究提供一個更安全、效率、節省空間的回收鐵鋁罐新方法 - 扭轉。藉由預期圓筒在扭轉過程,對於固定半徑和長度會自發產生的摺痕數,事先在表面壓痕,一旦喝完飲料,只要輕輕一扭,馬上能將罐子安全地變扁,不用擔心割到手或罐子在踩壓時飛噴傷人。 我們系統地從實驗觀察和歸納不同半徑、長度、厚度、材料及拉伸力對於圓筒摺痕數目 (N)和偏斜角(α)的影響,並從幾何和能量考量,推導出符合實驗結果的簡單公式,得到不同參數下的擬合曲線,用來實際製作各種材料的回收模型。 由於日常容器有其他形體,我們接下來推廣到兩端半徑不同的圓筒和正多角柱。藉由實 驗數據及修正圓筒理論,得到較廣義的規律摺痕理論公式,預期同樣能夠利用此公式來設計摺痕;正多角柱與圓筒類似,在扭轉後產生規律的摺痕,只是數目和種類需要修正,因此也能夠利用扭轉達到壓縮的效果。

運用DDPG建構氣動式肌肉上臂運動強化學習模型

研究探討透過強化學習讓機器學習各種人類上臂運動。延續「運用氣動肌肉缸模擬上臂肌肉控制之研究」,透過有限的動作組可以控制上臂肌肉,然而因應環境條件的多變,模擬人類透過學習產生多樣多變的反應,在仿生的領域中有其必要。比較強化學習中的Actor-Critic與 DDPG (Deep Deterministic Policy Gradient)兩種模式,我們透過 Gym 建構具動作與環境限制的簡易訓練環境。比較兩個模型的細節後,最後選用了 DDPG 為我們主要的強化學習方法。首先我們利用 Tensorflow 模擬學習模式並記錄模擬移動的學習過程。我們運用到仿生手臂的實體,藉由影像辨識取得手臂的狀態,回饋至學習模型。仿生手臂運用學習資料進行移動,接著我們觀測系統所學習的移動是否可完成指定動作或工作。在軟體模擬中,我們證實了藉由達成數次目標的學習後,DDPG 可完成較細緻的移動。而 DDPG 在仿生手臂上的實作,則需透過輸出動作給氣動仿生手臂系統,來控制仿生手臂移動至目標位置。在未來,機器人將不單單只是運用馬達來當作動力來源,也能運用氣動肌肉缸成為動力元件。並且,人形機器人將會做出更像真實人體的動作。

風力罩得住酷旋發電機

本研究共設計十二個實驗,探討垂直型風力發電機如何將各方吹來的風充分利用,首先設計能減少風力扇葉轉軸轉動摩擦力的軸承,接著製作導流罩以收集所有吹進來的風並提高 磁動生電的轉換效率。我們製作的風力發電機將來自四面八方的自然風有效利用,具積少成 多的集風特性,輸出電壓可達30V以上,並能針對鋰電池充電,發揮以時間換取空間的特殊功能,且因為體積小,非常適合於臺灣地狹人稠而且風力不強的環境。我們將自製的發電機實際應用在學校走廊、樓梯間以及樓頂進行發電,可以提供夜間照明,達到自給自足的綠色能源目標。

Automated Inflation and Pressure Regulation for Recreational and Professional Cyclists

Cycling is a very popular mode of transport as well as a famous sport around the world. Many people enjoy this sport either professionally or recreationally. Cycling in the UK alone has grown up to 200% since lockdown in 2020. (Chandler, 2020) Cyclists make use of a broad selection of products to enhance their performance. Those products range from wireless gear shifting, advanced geometry, smart suspension. This project is aimed to indicate the importance of tire pressure and to introduce a product which will be able to adjust tire pressure while cycling. This product will give cyclist an advantage on different terrains as well as eliminate some common problems amongst cyclists. Flat tires are one of these problems. It occurs commonly amongst cyclists and can happen due to a variety of reasons. Another problem is wrongly inflated tires. This causes unnecessary loss in a cyclist’s power and speeds due to the high rolling resistance between the tires and the surface. This then results in losing time whether racing or commuting. In an article published in 2014 in Velonews.com, Lennard Zinn states: “Whether on tarmac or singletrack, a tire with lower rolling resistance reduces the power required to move forward while also providing a better quality ride. The tire absorbs small bumps by not transferring them into the bicycle and rider, resulting in a smoother ride, faster speeds, and better cornering." (Zinn, 2014) Taking this in consideration it becomes clear that it is important to develop a system which is able to control tire pressure.

An Analysis and Optimization of Double Parallelogram Lifting Mechanism

Double Parallelogram Lifting Mechanism (DPLM) is a compact and stable lifting mechanism with a large extension range widely adopted in robot designs. Rubber bands and springs are often installed on the DPLM to lighten the motors' load and maintain its height, yet the installation positions are often obtained through trial and error. This project aims at finding the optimal rubber band installation positions for DPLM using modeling and optimization techniques. A mathematical model which describes the forces and moments acting on all the linkages of DPLM was derived based on the conditions for the static equilibrium and verified with a 3D simulation software. A genetic algorithm (GA) was implemented to optimize rubber band installation positions, which managed to find solutions with the overall root-mean-square- error (RMSE) of the net moment less than 2 for 2 to 6 rubber bands. A further statistical analysis of 50000 random rubber band samples showed that installing rubber bands in triangles is the best solution with the overall lowest RMSE. A test was conducted with a prototype of the DPLM and the results were consistent with our model and optimization. This project derived and verified a mathematical model for the DPLM, and found the optimal way and positions to install rubber bands. The results of this project provides a theoretical basis for controlling DPLM with rubber bands, allowing it to be further adopted in industrial robots that require repetitive lifting and lowering such as inspection robots and aerial work platforms.

HYBRID COMPOSITE FROM X-RAY WASTE

This study considered the tensile and flexural characterization of new lighter and cheaper hybrid composite materials to replace the existing insert panel for the currently available bulletproof vest. The materials chosen included a natural fibre, i.e., kenaf fibre, chemically treated with sodium hydroxide solution, and, as a means of recycling, used x-ray films with a surface treatment. Using the traditional hand lay-up method, the materials were fabricated into seven layers of different configurations, which were then subjected to tensile and flexural tests. The findings showed that one of the configurations that consisted of both treated materials had a tensile strength of 396.9M Pa, which is quite strong, and a flexural modulus of 6.24G Pa, which makes it flexible enough to be made into wearable equipment. This configuration was then chosen to be the base design for the specimen subjected to impact test. The interfacial bond between the two distinct materials proved to be a major issue, even with the help of fibre treatment. Therefore, some improvements need to be made for the material to be comparable to existing materials performance-wise hence making this configuration suitable for ballistic application.

太陽軌跡在車輛儲能之創新研究

本研究探討太陽軌跡在車輛儲能之創新應用,使得太陽電池以簡單的方法得到最大的吸收能量。首先,利用Stellarium免費天文軟體,完成一個太陽電池最佳方位角與仰角的計算公式,基於光學與鏡面反射原理之瞭解,提出全新的鏡面最佳轉角定理,使鏡面反射之轉角得以迅速精確計算。本文引入GPS衛星定位功能,將這個太陽電池能量追蹤方法,由靜態的的地面應用,推展到動態的車輛應用。最後,由本實驗結果顯示,利用本文提出的創新研究,與單純平放太陽電池之儲能作法比較,若將反射鏡或者太陽電池隨時對準最佳方位角與仰角,可以獲得多出20 %〜52 % 的免費能量!

Using P.I.P. to strengthen roads: Plastic incinerated by plastic

People have become accustomed to single-use plastics. These are plastics that are used once only and are then thrown away or recycled. A piece of plastic can only be recycled 2-3 times before it is of bad quality and can no longer be of use. (Achyut K. Panda, 2019). Plastic waste fills up landfills and oceans, becoming hazardous and harmful to wildlife, while emitting greenhouse gasses. Alternatives, such as metal straws and paper bags have turned out inefficient and plastic is still a great need in society. Another way of getting rid of waste plastic is to burn it. Fossil fuels such as coal and natural gas are being utilised to burn plastic in industry. This causes many harmful emissions, such as carbon dioxide and carbon monoxide released from burning the plastic. It results in more damage being done than just leaving the plastic in a landfill. These emissions can be cleaned before being released into the atmosphere. Plastic is made of petroleum, so when it is burned it is converted back into a fuel. Plastic can be burned under controlled conditions to create a fuel source that can be used, thereby utilising the waste plastic. The research conducted aims to investigate the use of plastic waste to burn other plastic to create a renewable fuel source and to eliminate plastic waste.

LENS WITH VARIABLE OPTICAL CHARACTERISTICS

Research work on creating a lens, the optical power can be changed depending on human needs. Most people have visual impairments that need to be corrected with surgery or optical devices (glasses and contact lenses). The optical characteristics of the human eye vary depending on age, health, intensity of visual load. We propose to give people the opportunity to smoothly adjust the optical power of the spectacle lens by changing the transparent tubes between the two windows of transparent films. Experimental studies have shown the possibility of adjusting the optical power of the proposed line in a wide range. Existing devices and materials for changing the optical power of the line are analyzed. The design of a lens with variable optical characteristics is proposed, which is created from two window films, the space between which is filled with liquid. Publicly available materials for the outer shell of the lens and liquid for its filling. The effect of the amount of liquid to be filled on the optical power of the lens was experimentally determined. The formula for experimental finding of focal length of a lens is entered. Novelty is impossible because you can use the lens in another field. For example, in the future it is planned to perform an experiment with a lens system to create, for example, a telescope.

An Analysis and Optimization of Double Parallelogram Lifting Mechanism

Double Parallelogram Lifting Mechanism (DPLM) is a compact and stable lifting mechanism with a large extension range widely adopted in robot designs. Rubber bands and springs are often installed on the DPLM to lighten the motors' load and maintain its height, yet the installation positions are often obtained through trial and error. This project aims at finding the optimal rubber band installation positions for DPLM using modeling and optimization techniques. A mathematical model which describes the forces and moments acting on all the linkages of DPLM was derived based on the conditions for the static equilibrium and verified with a 3D simulation software. A genetic algorithm (GA) was implemented to optimize rubber band installation positions, which managed to find solutions with the overall root-mean-square- error (RMSE) of the net moment less than 2 for 2 to 6 rubber bands. A further statistical analysis of 50000 random rubber band samples showed that installing rubber bands in triangles is the best solution with the overall lowest RMSE. A test was conducted with a prototype of the DPLM and the results were consistent with our model and optimization. This project derived and verified a mathematical model for the DPLM, and found the optimal way and positions to install rubber bands. The results of this project provides a theoretical basis for controlling DPLM with rubber bands, allowing it to be further adopted in industrial robots that require repetitive lifting and lowering such as inspection robots and aerial work platforms.