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Prediction of Acoustic Absorption Performance of a Perforated Plate with air jets

Journal of Thermal Science 2017年第4期26卷 378-384页

作者： Hiromitsu Hamakawa Masanori Miyazaki Yuta Asai Eru Kurihara Eiichi Nishida Hidechito Hayashi Department of Mechanical Engineering Oita University700 DannoharuOita 870-1192Japan Graduate Student Oita University700 DannoharuOita 870-1192Japan Department of Mechanical Systems Engineering Shonan Institute of Technology1-1-25 Tsujido-NishikaiganFuji-sawaKanagawa 251-8511Japan Department of Mechanical Engineering Nagasaki University1-14 Bunkyo machiNagasaki852-8521Japan

The present study focuses on the prediction of acoustic absorption performance of a perforated plate with air jets by theoretical calculations. In addition, we experimentally measured the flow rate, internal pressure, acoustic pressure, and transfer function using an acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. We investigated the influences of background air space, flow velocity, thickness, aperture rate, and aperture diameter of a perforated plate on the acoustic absorption characteristics. The frequency characteristics of the acoustic absorption coefficient showed a maximum value at a local frequency. As the background air space increased, the peak frequency of acoustic absorption characteristics decreased. As the flow velocity passing through the apertures increased, the peak level of the acoustic absorption coefficient also increased. The theoretical results agreed well with the experimental ones qualitatively.

关键词： acoustic absorption perforated plate theoretical prediction acoustic impedance tube air jets

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Design of an Automated Sorting System for Apples Based on Single Chip Microcomputer

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Instrumentation 2019年第4期6卷 95-108页

作者： Liqun WANG Clarence W.DE SILVA Bing LI Yuan Cai Harbin Institute of Technology at Shenzhen Shenzhen 518000 The University of British Columbia VancowerBCCanada V6T 1Z4

The grading judgment for apples is related to a variety of factors including,size,shape,color,texture,and *** manual sorting methods are time consuming and labor *** addition,the accuracy of the method is easily subjective,not repeatable,error-prone,and affected by the sorting *** paper presents a complete and automated grading system for *** system uses a single-chip microcomputer as the controller of the system,and a PC as the graphics processing *** also includes a conveyor,drive motor,frequency converter for motor control,photoelectric sensors,air compressor,and air jets for ejecting the graded *** classification algorithm is implemented by using a convolutional neural network(CNN).In order to eliminate contact damage of apples,the system specifically uses air jets as actuators to eject the graded apples into the corresponding *** the same time,in order to ensure that an apple triggers the correct ejecting actuator,this paper designs a jet controller with proper logic.

关键词： Automation Single Chip Microcomputer Apple Grading Convolutional Neural Network air jets

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CALCULATION FOR SMOKE-PREVENTING air CURTAIN IN A HIGH-RISE BUILDING

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Transactions of Nanjing University of Aeronautics and Astronautics 1997年第1期14卷 80-84页

作者：何嘉鹏姜正良鄢建平龚延风南京建筑工程学院城建系南京航空航天大学飞行器系

The effective smoke preventing installation should have the functions such as absolute smoke insulation, going into and coming off the smoke preventing place freely, no confinement of sight. The smoke preventing air curtain is the most effective. Based on the previous researches done by others, the flow field is theoretically analyzed and the calculating method for the smoke preventing air curtain of high rise buildings is inferred by means of mathematics in this paper.

关键词： air jets potential flow flow function

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