数学建模论文分析解析

数学建模国际赛

承诺书

我们仔细阅读了第三届“认证杯”数学中国数学建模国际赛的竞赛规则。

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我们的参赛队号为：1570

我们选择的题目是：A

参赛队员(签名) ：

队员1：魏祯

队员2：李兴

队员3：高安森

参赛队教练员(签名)：无

数学建模国际赛

编号专用页

参赛队伍的参赛队号：（请各个参赛队提前填写好）：#1570 竞赛统一编号（由竞赛组委会送至评委团前编号）：

竞赛评阅编号（由竞赛评委团评阅前进行编号）：

The most resounding whistle

Abstract:

In this report, through the analysis of factors affecting the whistle sounding loudness, we build gas unitary flow model and multi structure model. In model 1, using the mass conservation equation and continuity equation of flow of energy conservation in, obtained the density, velocity, relationship quality force was established, so that the energy to keep the optimal combination of maximum; in model 2, through the method of control variables, to study the impact of different mouth size on loudness, simulate and repeated experiments, the structure and size of the whistle body that the strongest sound. Combined with the model two and model, we design the loudest whistle.

Key words: sounding loudness gas unitary flow model

energy conservation the mass conservation

Introduction:

The whistle ,a device which is through the air quickly pressed into a narrow space within the device caused by the airflow disturbance, sounding device to send a strong sound. Whistle in the life and production have been widely used. Traffic police using whistles to guide the vehicle through, soldiers through the emergency buzzer to achieve the aim of urgent collection, sports events, refereeing to decisions and guidance game by whistle, when people are in danger, they send out a signal of distress through an intense whistle . So often the high quality of whistles can play an important role in production and life. So can we design a sufficiently loud whistle is the key to improve the quality of life and production efficiency?

Assumptions:

●The whistle sound is caused by air turbulence caused by the vibration,

the airflow of different intensity will affect the intensity of the sound a whistle.

●Humidity and velocity of sound and the air whistle, the humidity of

the air will cause varying degrees of impact on air quality, sound quality, different velocity of air will send out different sounds.

●The sound and the gas whistle by friction. Will cause friction whistle

acoustic energy body loss, would seriously weaken the intensity of sound.