星载相控阵热变形误差估计与校正方法

为提高星载相控阵天线热变形误差估计精度,提出一种结合机械测量和信号处理的误差估计方法。该方法利用测量传感器的测量数据,能够快速地拟合得到形变阶数和阵元初始位置;根据星-地几何关系,提取已知来波角度的模糊地块回波作为校正源数据,进而结合形变特性建立优化模型,在迭代中计算得到更加精确的阵元位置估计值。仿真结果表明,该方法能够获得优于1/15波长的热变形误差估计结果,并且在较大变形误差的情况下仍具有良好的稳健性,最终获得了良好的方向图校正结果。     

精密机械热误差校正的遗传优化设计

研究精密机械热误差校正的机理，提出主动热校正控制变形误差的精度指标。针对热控制源幅值参数确定的困难性，引入一种新的优化算法一基因遗传算法，用于热控制源的幅值参数的优化设计，实例研究表明遗传优化算法在热误差校正控制中的应用是成功的，具有广阔的应用前景。     

超声波流量计几何尺寸检定研究

为了实现超声波流量计在线流量测量,发展一种有效的超声波流量计现场非实流校准技术十分重要.超声波流量计的非实流校准以超声传播时间差的标定和几何尺寸的校准为基础,由于现场校准设备的局限性及简化操作流程的需求,以几何尺寸的校准为基础,通过公式推导分析对流量计量产生影响的参数,并结合实验确定参数对流量计测量数值的影响.以某型DN80多声道流量计的非实流校准过程为例,分析并验证小口径多声道超声流量计的非实流校准技术.在校准过程中,由内径千分尺测量管道内径,并使用流量计所带的传感器组进行超声激励和接收.对所得超声信号使用相关法进行处理,计算声程长度,并对流量计出厂参数进行修正.结果表明：校准后测量误差大幅下降,该方法可以用于小口径多声道超声流量计的校准.

     

变水头变流速水流量标准装置的流动模型

提出建立交水头交流速水流量标准装置准确数学模型的方法，分析了雷诺数和流阻对模型的影响，并通过实验验证了理论分析结果。     

火电厂烟气脱硫的己二酸一硫酸钠复合添加剂研究

研究单一有机羧酸和己二酸一硫酸钠复合添加剂对石灰石浆液的促溶作用以及pH缓冲作用;基于石灰石一石膏湿法脱硫模拟实验装置测试己二酸和复合添加剂强化湿法烟气脱硫的效率,分析人口S02浓度、液气比分别对脱硫率的影响．结果表明：己二酸对石灰石浆液的促溶作用和pH缓冲作用强于大多数单一有机羧酸;己二酸一硫酸钠复合添加剂对浆液的促溶作用强于单一己二酸而pH缓冲作用相差不大;当人口SO2浓度为1608mg／m2,液气比为4．5L／m3以及其他条件一定时,5mmol／L己二酸＋0．02mol／L硫酸钠的复合添加剂效果最好,其脱硫效率可达95．4％,比石灰石空白试验提高11．3％,较5mmol／L己二酸强化提高5．3％,且能使石灰石的利用率提高大约50％．在益阳电厂工况条件下测试复合添加剂效果,达到了新的GB13223—2011《火电厂大气污染物排放标准》中“新建锅炉SO2排放限值≤100mg／m3”的要求．     

Evaluation of properties and thermal stress field for thermal barrier coatings

In order to get thermal stress field of the hot section with thermal barrier coating (TBCs), the thermal conductivity and elastic modulus of top-coat are the physical key properties. The porosity of top-coat was tested and evaluated under different high temperatures. The relationship between the microstructure (porosity of top-coat) and properties of TBCs were analyzed to predict the thermal properties of ceramic top-coat, such as thermal conductivity and elastic modulus. The temperature and stress field of the vane with TBCs were simulated using two sets of thermal conductivity data and elastic modulus, which are from literatures and this work, respectively. The results show that the temperature and stress distributions change with thermal conductivity and elastic modulus. The differences of maximum temperatures and stress are 6.5% and 8.0%, respectively.     

大流量管道煤气的控制技术研究

针对钢厂燃气蒸汽联合循环发电工程的稳压关键技术问题,探讨了混合煤气压力波动机理,提出了混合煤气的主动控制方法,分析了控制阀死区的产生与影响,并研究了死区的补偿机理.结果表明:通过在控制阀执行机构叠加适当的颤振信号可以实现对其死区的有效补偿,而主动控制方法对整个煤气管路的压力脉动抑制效果显著.     

外置轴向式分层注水超声流量计的设计与实现

针对油田井下注水流量传统测量方法存在的各种问题,设计了一种高精度外置式轴向超声波流量计,适用于高温、高压、小流量、小管径条件下的分层注水流量的精确测量。基于时差法测量原理,采用轴向结构增加了声程,采用高精度时间测量芯片TDC-GP22提高了时间测量精度,通过温度补偿模型、流场修正模型进一步提高了其测量精度。仿真和试验结果表明,在0~250m³/d流量下,测量精度可达1.5%,满足油田井下分层注水技术要求,为油田井下实现精细分层注水和自动监测调控提供了基础数据。     

Development of calibration system for transmission control unit of AT based on XCP

To guarantee control system’s performance and shorten the development cycle during the development process of hydraulic automatic transmission,a calibration system on CAN for high-power AT ECU is designed based on XCP. In this system,it is possible that the master dynamically searching the slaves available on bus and data synchronization between master and slave is also achieved. Real-time measurement and on-line calibration can be executed during the running process of transmission control unit,so the calibration result is displayed in time. Calibration by true value and physical value are both available. Experimental results showed that this system operated stably and reliably and had strong time-out handling ability.     

Natural ventilation performance of single room building with fluctuating wind speed and thermal mass

Natural ventilation is driven by either buoyancy forces or wind pressure forces or their combinations that inherit stochastic variation into ventilation rates. Since the ventilation rate is a nonlinear function of multiple variable factors including wind speed, wind direction, internal heat source and building structural thermal mass, the conventional methods for quantifying ventilation rate simply using dominant wind direction and average wind speed may not accurately describe the characteristic performance of natural ventilation. From a new point of view, the natural ventilation performance of a single room building under fluctuating wind speed condition using the Monte-Carlo simulation approach was investigated by incorporating building fa?ade thermal mass effect. Given a same hourly turbulence intensity distribution, the wind speeds with 1 min frequency fluctuations were generated using a stochastic model, the modified GARCH model. Comparisons of natural ventilation profiles, effective ventilation rates, and air conditioning electricity use for a three-month period show statistically significant differences (for 80% confidence interval) between the new calculations and the traditional methods based on hourly average wind speed.