文档介绍：论文题目来源:
国家自然科学基金项目
编号:
四川省自然科学研究项目
编号:
校级自然科学研究项目
编号:
弦振动实验的研究
学生:王彬
指导老师:吴英
摘要:弦振动实验存在着诸多困难,弦的张力会因弦的振动发生变化,弦的线密度会发生微小变化,当波腹数增多时现象不明显,低频信号器共振频率读取不准确等。本研究通过文献综述、理论研究、比较研究等方法,针对上述原因,利用实验室的装置验证弦振动理论采集相应数据并进行结果处理,通过在体验实验过程和数据处理方面的困难,对本实验装置提出切合实际的改进方法,以克服主观和客观方面的困难,使实验现象更加明显。
关键字:弦振动;共振;波腹;张力;线密度
The Research of String Vibration Experiment
Undergraduate:Wang Bin
Supervisor:Wu Ying
Abstract:String vibration experiment is an important experiment of college physics. The experiment is also a deep exploration and application of string vibration knowledge. There are many difficulties in the experiment. For example, string tension will change because of the vibration of the string. And the linear density of the string will inevitably have subtle change. Besides, we can not get precise data of the resonance frequency of low frequency signal generator when the increase of the wave loop is not obvious. As for the above reasons, this research, with the following methods, such as literature review, theoretical research parative approach and so on, uses the equipments in the lab to prove the theory of string vibration and collects relevant data and then deal with the data. After knowing the difficulties in the experiment and in dealing with the data, I will propose some practical methods to improve and reform the experiment equipments so that we can e subjective and objective difficulties and so that the experimental phenomenon can e more obvious.
Key words:string vibration; resonance frequency; wave loop; string tension; linear density.
目录
引言 1
1. 弦振动的基本原理 1
1. 1问题的提出 1
1. 2弦振动模型 1
1
2
4
4
5
6
8
3. 实验存在的主要的困难及改进 8
8
9
10
11
参考文献 12
致谢 13
引言
弦振动理论的运用渗透在我们的生活中各个方面,如弹奏二胡需要巧妙的手型,弹奏钢琴时要多大的力手指触碰什么位置,工程技术中的锯木条。其理论对我们实际操作有重要的指导意义,但在实践中人们遇到的问题不是理论的不完善,而是具体的操作的困难。通过不断的实验修正,改变振源、改变测量方法、利用计算机、利用传感器等各种办法办法以确保实验值与理论值更接近。我国目前在这方面也取得一定的成就