内燃机油底壳加强板声学优化

对内燃机油底壳的加强板安装位置和长度进行了声学优化。优化目标函数取辐射声功率级和增加的质量两者的加权值。采用有限元方法和边界元方法建立了复杂结构辐射噪声预测模型，用于计算辐射声功率级。结果表明，对内燃机薄壳结构进行声学优化，可以大大减小噪声辐射。     

内燃机噪声控制技术

通过对内燃机噪声生成机理、噪声传递途径和噪声辐射表面的分析，讨论了内燃机降低噪声的措施和方法。     

内燃机噪声控制技术研究现状和发展趋势

从内燃机噪声产生机理、噪声源识别及分离技术、噪声预测及控制等几方面综述了近年内燃机噪声控制技术的研究现状,提出了未来内燃机噪声控制技术研究方向。     

开展中小功率内燃机降噪研究

本文论述了降低内燃机噪声当前这一十分重要而又紧迫的任务并综述了国内外中小功率内燃机降噪研究的动态.     

内燃机表面辐射噪声控制探讨

通过对内燃机表面辐射噪声测试试验的分析研究,对主要表面辐射噪声的发生部件如油底壳、气门罩盖、齿轮、空滤器、消声器提出改进措施,以降低噪声.     

单缸内燃机排气噪声的声功率

內燃机排气噪声是内燃机的主要噪声源。本文对产生排气噪声的机理以及声功率进行了理论探讨。在低频域,内燃机排气噪声具有简单源特性;在中、高频域,排气噪声具有四极子源特性。在频域上给出了排气噪声声功率的公式。     

基于独立分量分析技术的内燃机噪声源识别

为降低内燃机的噪声,需要有效地识别内燃机的众多噪声源。采用一种新的独立分量分析技术对采集到的内燃机混叠噪声信号进行分离,并结合噪声产生机理辨别出单个噪声分量对应于内燃机的相应噪声源,从而有效地识别内燃机噪声源。实践证明,该技术可以有效识别内燃机的混叠噪声。最后就噪声控制提出了建议。     

内燃机燃烧噪声的研究与发展

本文概述了内燃机燃烧噪声的特性及其研究与发展，阐述了燃烧过程参数、结构参数、工况参数以及其它参数影响燃烧噪声的机理，论述了近年来降低燃烧噪声、内燃机燃烧噪声机理和内燃机瞬态工况燃烧噪声的研究状况。通过对燃烧噪声与内燃机工作过程中激发燃烧噪声特征因素关系的描述，为了解燃烧噪声特性和降低燃烧噪声提供全面的技术支撑。     

半自由声场内燃机噪声实验的设计与建设

本文介绍了国家标准中内燃机噪声测试对声学测试环境的要求，提出了内燃机噪声实验室建设的指标。重点介绍了天津大学内燃机学科在211工程建设中，利用原有的实验室空间，设计和建设半自由声场内燃机噪声实验的情况。     

环境保护与内燃机噪声控制技术

内燃机噪声污染应引起重视。综述了车用内燃机噪声控制技术的发展历程、现状和最新发展趋势 ,指出我国内燃机噪声控制技术在保护环境中的地位     

Long-term energy projections for the U.S.A.

This report starts by surveying a series of papers that are representative of recent U.S. work on national and international energy policy. Among professional analysts, there are the beginnings of a consensus on energy demand projections and on energy-economy interactions. Moreover, it is recognized that conservation policies will be difficult to implement unless domestic prices are raised to the international level. The paper includes a series of long-term energy projections based upon ETA-MACRO. This model allows for: energy-economy interactions, cost-effective conservation and interfuel substitution between electric and nonelectric energy. the calculations are based upon a somewhat less optimistic view of synthetic fuels and of ‘backstop’ technologies than appear in the Carter Administration's recent proposals. With synfuels, backstops and nuclear energy—and with realistically reduced projections of demand growth—there is a reasonable prospect that the U.S. could meet an international commitment to limit oil and gas imports. U.S. import reductions could be achieved directly through the market price mechanism, without tariffs or quota limitations. For this to happen, however, the international price of oil would have to be doubled (in constant dollar terms) by the year 2000. A policy of gradual OPEC oil price increases would facilitate the transition away from oil, and could serve the long-run interests of both the producing and consuming nations.     

Long term perspectives of the U.S. energy demand: Application of the MEDEE 2 model to the U.S.

This paper gives a brief outline of a model, MEDEE 2, designed to evaluate the long term energy demand of a country and describes how it has been applied to the United States. The energy demand projections were carried out for the years 1985 and 2000 based upon three scenarios. According to these scenarios, the final energy demand will grow from 60 quads in 1975 to a value between 76 and 88 quads in 2000 (a quad is very close to 10¹⁸ joules), which implies a growth of the per capita energy demand from 10 kW to a value between 10.8 and 12.5 in 2000.     

On the non-stationary evaporation kinetics. II. Stability

A stability analysis of the one-dimensional Oberbeck-Boussinesq equations has been done. It is shown, that the increase of the evaporation rate is result of the instability of the natural convection flow. Velocity parameter of this flow is obtained on the basis of experimental data.     

Assessing the U.S. oil security premium

World oil supply disruptions lead to U.S. economic losses. Increased oil consumption increases the vulnerability of the economy to oil supply disruptions, but it matters where the additional oil is produced. Increased production from stable producers can dampen future oil price shocks, whereas increased production from unstable producers can exacerbate future oil price shocks. Because oil is fungible, U.S. pricing and import policies can differentiate only between domestic and imported oil rather than between stable and unstable sources. The economic losses associated with oil supply disruptions—GDP losses and some transfers abroad—are externalities that can be quantified as oil security premiums. We estimate these premiums by taking into account projected world oil market conditions, probable oil supply disruptions, the market response to oil supply disruptions, and the resulting U.S. economic losses.     

万有特性曲线的计算机图形处理及其方法

内燃机万有特性曲线的等油耗率线常为一组多值曲线,为了实现用计算机对此曲线图形进行处理,作者采用累加弦长三次参数样条曲线的方法,绘出了万有特性曲线,并讨论了几种不同边界条件的处理以及前期对负荷特性数据的处理的方法。在袖珍计算机上经过验证(带小型四色绘图机),取得了良好的效果。