Giant Magnetostrictive Material Loudspeaker System Acoustic Radiation Simulation

An infinite panel model of giant magnetostrictive material loudspeaker system(GMMLS)is proposed by making use of finite element method(FEM).Bending wave eigenfunction is introduced to describe the acoustic radiation condition of the panel.Far-field response in different conditions is calculated by changing the mass surface density.Conclusion is obtained by analyzing the curves simulated,that panel which has larger mass surface density can hardly generate far-field acoustic radiation for lower frequency,while the panel has smaller mass surface density generates far-field acoustic radiation for lower frequency evenly and stronger.     

Fuzzy Control of Semi-Active Suspension Based on 7-DOF Tracked Vehicle

On the basis of analyzing the system constitution of tracked vehicle semi-active suspension, which consists of electrorheological (ER) damper and shape memory alloy (SMA) spring, a seven degree of freedom (7-DOF) dynamic model is established. The change of the elasticity of SMA spring and the characteristics of the ER shock absorber are studied. In addition, the study about fuzzy control logic is also carried out. Simulation of a C grade road under random excitations and definite disturbances is performed. Simulation result shows the fuzzy control strategy, which is used in the control of semi-active suspension system with ER damper and SMA springs, is effective, stable and reliable.     

连续冶炼冶金焦工艺初探──(Ⅱ)特点和有待研究的问题

本文论述了连续混热式冶金焦炉炼焦新工艺的特点，对连续炼焦工艺几项预期指标与现有几种焦炉做了比较，并指出了连续炼焦工艺有待解决的问题。     

亚临界H2O-CO体系改性长焰煤的黏结和热解特性研究

长焰煤通过加氢改性转化为黏结性煤,有利于提高其综合利用效益和扩大炼焦煤资源。利用亚临界H2O-CO体系对印尼长焰煤进行改性,考察了不同反应温度下改性煤的热解特性,并利用索氏抽提、热重（TG-DTG）和傅里叶变换红外光谱（FTIR）探究了煤结构变化对其热解产物分布规律的影响。结果表明:长焰煤在亚临界H2O-CO体系中改性后黏结性显著提高,获得的改性煤黏结指数（GRI）随反应温度升高至340 ℃而达到最大值;改性煤中氢含量和索氏抽提可溶组分收率的提高,使得改性煤热解焦油产率升高而热解气产率降低,同时改性降低了煤中氧含量,导致热解水产率降低;改性煤中沥青烯组分提高,将抑制其快速热解失重,而改性处理后脂肪族-CH、-CH2和-CH3伸缩振动吸收峰增强,导致改性煤热解气H2和CH4体积分数均高于原煤。     

探究山西省低碳经济之路——“山西省低碳经济发展高峰论坛”的专家谏言

叙述了发展低碳经济的紧迫性,指出,山西应从加大投资,开发无碳和可再生能源,促进高碳能源低碳化利用,开发煤气化与氢能的结合、煤层气综合利用、焦炉煤气深加工的技术,制作氢与天然气的混合燃料,以及强化高碳企业集群化、低碳化发展,培养低碳经济龙头企业和加强政府政策扶持等方面着手,推进山西低碳经济的发展。     

关于正确理解堆芯损坏概率的进一步讨论

堆芯损坏概率/频率这一指标经常用在关于核电安全性的讨论中,其数值意义及概念的认识或理解尚需进一步明确。本文利用概率论相关方法,在深入了解堆芯损坏频率（CDF）获得过程的基础上,讨论了利用泊松过程来计算堆芯损坏概率（CDP）的方法。并说明了直接叠加单个堆年CDF来估计CDP,是一种常见的近似方法,其误差会随着堆年数的增多而变大,应明确其适用范围。计算表明：在10%误差的条件下,对CDF为1×10^－4/(堆•年)的堆,用近似方法可讨论到约2000堆•年,而对CDF为1×10^－5/(堆•年)的堆,则可讨论到约20000堆•年。同时在使用该指标时,不能忽略反应堆发生堆芯损坏这一事件本身的随机属性。     

天然气吸附材料研制及水合物技术进展

分析讨论了炭质吸附剂、金属有机骨架材料、沸石的研制现状和存在问题,详细介绍了天然气水合物存储新技术,提出将多孔材料与水合物技术相结合是提高存储密度的新思路。     

Vibration Control of Vehicle Suspension System by Electrorheological Damper

Over the past three decades ,vibration control ofvehicle suspension systems has always been the sub-ject of extensive research in order to provide a goodride comfort performance for passengers . The pri ma-ry objective function of any vehicle suspension systemis toisolatethe bodyfromroadway disturbances[1 -5].Generally three types of suspension systems are used,namelythe fully active ,the semi-active and the pas-sive control systems . Compared with the other twosuspensions,the semi-active susp…     

微细电火花放电参数的高速采集

放电参数的实时快速采集是实现微细电火花放电状态准确辨识与控制的必要前提,由于微细电火花放电频率高,波形畸变严重,需对放电信号进行极速采集以获得完整的放电信息,还要进行数据同步分析以实现对放电状态的实时辨识.以高速数据采集卡和工控机为硬件基础,构建了微细电火花放电参数的高速数据采集与处理系统.采用VC 6.0编写实时采集程序,研究了分区式数据循环处理技术,解决了放电信号同步采集和处理的技术难题.试验表明该系统具有良好的实时性和准确性,能为信号辨识提供数据,为实现可靠的微细电火花加工控制提供了保证.