摘要
从实验原理出发,计算相位差的不确定度,并对由公式计算的φ理值与实际测得的φ测值进行比较,发现二者之差最大可达到4.2°。分析了受迫振动相频特性曲线的变化规律,对部分论文中出现错误的相频特性曲线进行讨论,最后得出结论:随着驱动力频率的增大,振幅与驱动力之间的相位差应是逐渐减小的。
Beginning from experimental principle,it calculates the uncertainty of the phase difference, and compare with the theoretical value and the calculated value of the phase difference, and then obtain a result： the maximum difference between the two is 4.2°.Then, it analysis the change regulation of the phase-frequency characteristics of the force vibration,discuss the mistake of the phase-frequency curve of a part of paper, the last,have a result： the phase difference between amplitude and driving force is gradually decrease with enlarge-ment of driving force frequency.
出处
《大学物理实验》
2016年第4期18-20,共3页
Physical Experiment of College
基金
国家自然科学基金资助项目(61501502)
陕西省自然科学基金资助项目(2015JM6277)
关键词
共振
相位差
不确定度
resonance
phase difference
uncertainty
