1570队A题参赛作品1570队A题参赛作品.doc

第三届“认证杯”数学中国 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。 我们完全明白，在竞赛开始后参赛队员不能以任何方式（包括电话、电子邮件、网上咨询等）与队外的任何人（包括指导教师）研究、讨论与赛题有关的问题。 我们知道，抄袭别人的成果是违反竞赛规则的, 如果引用别人的成果或其他公开的资料（包括网上查到的资料），必须按照规定的参考文献的表述方式在正文引用处和参考文献中明确列出。 我们郑重承诺，严格遵守竞赛规则，以保证竞赛的公正、公平性。如有违反竞赛规则的行为，我们将受到严肃处理。 我们允许数学中国网站()公布论文，以供网友之间学习交流，数学中国网站以非商业目的的论文交流不需要提前取得我们的同意。 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 第三届“认证杯”数学中国 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 the end , the loudest whistle is designed. 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. Using Matlab application software, draw out the energy graph, Obtain the energy to keep the optimal combination of the largest . 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, utilizing Excel make dimension and amplitude diagram, Obtain from 5 mm to 10 mm range, whistle loudness is the largest. 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,