| Abstract: | 本論文在滾筒洗衣機的結構方面上呈現了完整的三維多體動態模型。由於在洗衣機減振方面上,大部份的參
考文獻都是根據實驗數據來控制洗衣機的振動,所以本論文在滾筒洗衣機的結構方面上提供了詳細的數學模型,
包含了連接箱體和盛水桶之間的懸吊系統以及連接盛水桶和脫水桶之間的接頭。因為洗衣機會根據不同的轉
速以及衣服的重量而產生不同的振動,所以我們需要不同的阻抗力來抑制洗衣機的振動。我們使用低成本以
及可控制的磁流變液減振器來抑制洗衣機的振動。使用軟體來模擬洗衣機時,在連接盛水桶和脫水桶之間的
接頭,在前面部份的接頭,我們會建議用平面接頭和萬向接頭所組合而成的複合接頭,在後面部份的接頭,我們會建議
用平移接頭和球形接頭所組合而成的複合接頭,來取代只用一個轉動接頭連接盛水桶和脫水桶,如此一來,對於模擬
洗衣機的振動會更逼真。在控制洗衣機的振動方面上,我們用比例積分控制器來得到想要的電壓再經由磁流
變液減振器本身對電壓的限制(0v ~ 2.25v)來判斷所需要的電壓大小再輸入給磁流變液減振器提供適當的阻
抗力去抑制洗衣機的振動。透過軟體模擬的結果,對於盛水桶以及箱體的振動,在磁流變液減振器加入電壓之
後,我們可以發現抑制振動的效果非常顯著。
This paper presents a three-dimensional multibody dynamic model for a washing machine with front loading type
in details. Owing to most of vibration reduction techniques for washing machines with physical experiments, we present
the mathematical model for the washing machine completely including the suspension system between the case and the
basket and the bearing model between the basket and the drum. A drum-type washing machine is operated under varing
spin-drying stage and load imbalances, so we require varying damping force to reduce the vibration of a washing machine.
We use low-cost, controllable MR dampers as the suspension system for moderate-force vibration control in a washing
machine. The response about the vibration of a washing machine was improved with the bearing model between the basket
and the drum including the planar-universal joint in the front part and the translational-spherical joint in the rear
part instead of a revolute joint between the basket and the drum. The controller synthesis is to find the moderate
voltages for MR dampers providing the moderate forces to reduce the vibration of the washing machine. We present a PI
controller and a voltage algorithm to get the applied voltage for MR dampers in the range between 0v ~ 2.25v.
From the simulation results, it is clear that the vibrations of the basket and case are suppressed after two MR dampers
work. |
