ASSM-Ⅱ型声学悬浮泥沙观测系统

本文介绍了一种新型的水文观测设备－“ＡＳＳＭ－Ⅱ型声学悬浮泥沙观测系统”，它可认自动，连续和长时间地实时观测水中悬浮泥沙深度分布和动态变化过程，文中介绍了工作原理框图，技术参数，性能特点及海上现场观测结果。     

红外诱饵弹中药剂性能分析

从理论上论述了红外诱饵弹中药剂的组成、性能和配比 ,通过理论计算结果分析药剂的组成。为确定红外诱饵干扰点源红外寻的制导导弹的药剂配方提供依据。     

抗红外成像制导技术浅析

红外成像制导导弹自诞生以来 ,经过数十年的发展 ,技术日臻完善 ,应用日趋广泛 ,研究和探讨对抗红外成像制导的技术和方法就显得尤为重要。介绍了红外成像制导的基本原理、发展和在战争中的重要作用 ,重点探讨了对抗红外成像制导的几种技术手段。     

Design and application of functional absorbers

This paper gives an overview of the research at Institute of Acoustics, Tongji University, on functional absorbers and experience acquired in practical applications over the past three decades. Experiments and analysis of the absorption characteristics of three different geometrical forms of functional absorbers, i.e., panels, cubes and tubes, were conducted with different arrangements. The resulting esthetical effects are illustrated with pictures. Several non-fiber materials are used to compose functional absorbers with advantages both in acoustic properties and in architectural features. Cost effectiveness analysis is also given in order to provide design guidelines.     

Acoustic study of nano-crystal embedded PbO-P2O5 glass

Nano-crystal embedded PbO-P₂O₅ glass has been prepared and characterized by XRD and TEM measurements. The ultrasonic velocity and attenuation measured within the temperature range 80–300 K show significant structure and interesting feature with the presence of nano-crystalline region. The glass samples were prepared by melt-quench method and nano-crystals of different sizes were produced by heat treatment of the glasses for different durations of heating. All the processes were carried out at or above glass transition temperature. A theoretical model that takes account of the effects of thermally activated relaxation, anharmonicity as well as microscopic elastic inhomogeneities arising out of fluctuations has been successfully applied to interpret the variation of ultrasonic velocity and attenuation data. An interesting outcome of this application has been to propose a method for the determination of the size of nano-crystals from the ultrasonic attenuation data.     

对抗红外成像制导反坦克导弹的一种伪装方法

通过分析坦克的生存概率因素，阐明了单纯依靠运动和加强坦克的装甲防护能力是难以对抗红外成像反坦克导弹的。提出红外伪装网、红外干扰弹被动伪装和主动伪装相结合的方法，并以AGM-65D导弹的战斗参数为例对该方法进行了初步分析、评估。结果表明：该方法能够使坦克目标的生存概率大大提高．对其他目标对抗红外成像制导武器有一定的借鉴作用。     

B2 功率超声振动系统的电声效率测量

本用导纳圆图法和谐振导计算法，分别对用于超声清洗和塑料焊接的两个振动系统的电声效率进行了测量，结果表明在小信号和功率输出下，其电声效率基本相等，测量误差不超过±１５％。为通过电声效率和电功率测量，确定功率超声振动系统的输出声功率提供了可能途径。     

四点源诱偏系统抗反辐射无人机分析

针对有源诱偏系统抗反辐射无人机（ARUAV）的诱偏效果问题,建立了基于多点源诱偏系统抗ARUAV的模型,推导了多点源诱偏公式,重点推导计算了四点源诱偏抗ARUAV的合成场强和相位,并对无人机实时飞行过程中导引头处的合成场幅度和相位进行了仿真分析.仿真结果验证了模型的有效性.     

人体声发射定位技术的研究

从人体声发射技术与医学检测的特点出发,将人体骨科疾病的诊断和人体声发射结合起来,提出了具体的研究问题和解决手段。通过BL—420生物机能实验系统采集人体骨骼中的声发射信号,对该声发射信号利用互相关法计算时差,从而实现声源定位。     

音乐厅音质设计进展及问题探讨

音乐厅音质设计是室内声学中颇受关注的热点,大量研究成果显示了它的深入和进展,对当前国内大量兴建的音乐厅设计颇具参考价值。文章对下列四个方面展开了讨论:(1)音乐厅的明晰度、响度以及低音比的考量,(2)音乐厅体型选择以及座掎包饰程度的选定(3)耦合空间选用与实用中存在的问题,(4)空间感参量中的环绕感(listener envelopment,LEV)与視在声源宽度(apparent source width,ASW)在音质设计实施中的一些问题。