摘要
本研究以建立雨刷刷拭動態性能之量化指標為目標，建立實驗系統與分析方法。建立該量化指標可用來分析競爭產品的性能對比、生產過程之品質管制，以及於設計研發過程中，用於分析雨刷各種不同參數組合之性能差異，以便進行最佳化參數設計。 本研究從建立雨刷動態分析系統之硬體與軟體開始，所建立之系統包括雨刷測試平台、控制系統之硬體與軟體、以及一套動態特徵分析軟體。其中動態資料量測系統感知器包括加速度規、應變規、位置感知器與麥克風。系統控制軟體為TI DSP，並且以Labview截取雨刷刷拭過程各種動態訊號。動態特徵分析軟體則建立於Matlab軟體上。 完成系統之建置後，本研究針對兩種無骨雨刷進行刷拭動態實驗與特徵對比分析，目標為得到雨刷之動態特徵與性能量化指標。實驗結果顯示，本研究所建立的系統與分析方法，可以建立下列關鍵性能之識別指標：桿臂受力、刷拭擺動、跳動(chattering)，各種刷拭噪音的頻率特徵。另外，本研究更提出各刷拭噪音發生時，噪音訊號、加速度、桿臂受力三個關鍵參數的相關性特徵。
並列摘要
The noise and vibration of automotive windscreen wiper become more noticeable, because cars become increasingly quieter and more comfort. Wiper vibration and noise can be classified into three main categories namely, squeal noise, chattering, and reversal noise. In order to qualify a wiper both qualitatively and quantitatively, a dynamic test system and the associated method for analyzing wiper noise and vibration were established and studied in this thesis. The goal is to establish quantitative performance indexes for qualifying a wiper being testing. The study begin with the establishment of hardware and software for the dynamic test and analysis system. The system includes a wiper test platform, hardware and software for procedure control, and a PC with data acquisition and analysis software. Sensors include two accelerometers, a strain gauge, an angle position sensor, and a microphone. The control software is implemented on a DSP based microcontroller. With the completion of the system, a series of experiments were carried out on two designs of flat wipers with same size made by different company for comparisons. Two values of attack angles were used, namely -6o/+6o and 0o/-12o, under wet and dry windscreen conditions, respectively. The conclusions from this study are as follows. 1. The strain gage mounted on the wiper arm is useful to reveal the dynamic characteristics of the friction force between the wiper and windscreen. 2. The microphone mounted on a designed position of windscreen can clearly characterize the wiping noise under high level of background noise. 3. It is found that the noise signal, the accelerometer signals mounted on middle and end of the wiper, respectively, and the friction force signals are highly correlated with each other when an unwanted vibration and noise occur such as chattering, squeal, stick-slip, and stick-slap phenomena. This implies that these four signals can be used to identify the occurrence of the unwanted dynamics of the wiper, and furthermore, their values can be used to define the indexes that qualify a wiper.
參考文獻
延伸閱讀
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