嵌入式系统及模型化开发技术研究

随着电子技术的发展,嵌入式产品的丰富,消费者对嵌入式产品的功耗、性能、稳定性和安全性等方面提出了更高的要求,为了进一步缩短新产品的开发周期,减轻开发难度,提出基于Vx Works系统与Matlab/Simulink仿真工具的嵌入式系统软件平台,利用PCI总线与TMS320F2812控制的嵌入式接口箱相连,扩展了开发平台的接口,并可自动生成嵌入式C代码以及自定义模块封装。最后,利用搭建的嵌入式开发平台设计了避雷器监测系统校验平台,进一步证明了嵌入式开发平台的稳定性和可靠性,并利用模型化开发技术加快了嵌入式系统的开发速度。

混合动力控制策略解析及模型化开发

作为新能源汽车的关键部分,插电式混合动力汽车在节能减排方面发挥着很大的作用,而控制策略是其核心技术之一。为了提高混动车辆的开发效率并满足系统性能要求,以某插电式混合动力系统为样本,首先通过实验及分析,对标解析出整车控制策略,包括模式切换条件、能量管理策略、换挡机制等控制策略;然后依据整车对标策略,基于MATLAB/Simulink搭建整车控制策略模型,并仿真得到其经济性指标;最后将仿真结果与实验对标结果对比,进一步验证了整车控制策略及模型的准确性及实用性,从而实现了竞品车的模型化开发。

基于实时仿真平台的DSP技术研究

在实时仿真技术为电力电子技术研究的重要课题之一的背景下,以DSP作为控制器,FPGA为仿真器实现目标实时仿真平台。针对DSP传统和模型化两种开发方式,提出基于Matlab/Simulink和Embedded Coder的控制器算法开发方法。在实时仿真平台上,设计并实现两电平三相逆变电路、三电平三相逆变电路、单相逆变电压瞬时值反馈电路的实时仿真。根据平台仿真结果可知,模型化开发方式可以缩短控制器算法开发周期、提高开发效率、降低开发风险。

Simulation of the East Asian Subtropical Westerly Jet Stream with GFDL AGCM (AM2.1)

The present study validated the capability of the AM2.1,a model developed at NOAA's Geophysical Fluid Dynamics Laboratory (GFDL),in reproducing the fundamental features of the East Asian Subtropical Westerly Jet Stream (EASWJ).The main behaviors of the EASWJ are also investigated through the reanalysis of observational NCEP/NCAR data.The mean state of the EASWJ,including its intensity,location,structure,and seasonal evolution is generally well-portrayed in the model.Compared with the observation,the model tends to reproduce a weaker jet center.And,during summer,the simulated jet center is northward-situated.Results also demonstrate the model captures the variability of EASWJ during summer well.The results of the empirical orthogonal function (EOF) applied on the zonal wind at 200 hPa (U200) over East Asia for both the observation and simulation indicate an inter-decadal shift around the late 1970s.The correlation coefficient between the corresponding principle components is as great as 0.42 with significance at the 99% confidence level.

TMS320C6678的自动代码生成及其应用

为优化DSP工程开发方式,将Simulink的可视化模型开发与TMS320C6678相结合,采用可视化的模块设计工具对算法模型和数据流进行建模。模型之间具有标准的数据流传输接口,由代码生成工具根据算法函数模型的描述生成DSP平台上的信号处理程序,完成了MATLAB算法模型到DSP工程的自动代码生成转换。相较于传统的人工翻译成DSP工程的方式,能够在设计阶段就对算法功能进行仿真测试,使得开发者能够更快捷、以更少的成本花费进行开发,也让后期的算法架构修改变得简单。

An innovative design of septic tank for wastewater treatment and its performance evaluation： An applicable model for developing countries

A study was carried out to evaluate the treatment efficiency of modified model of septic tank（ST）for the treatment of domestic wastewater.The objective was to explore the possibility of increasing the removal efficiency,at household level,thereby reducing cost and treatment burden on city level treatment plants.For this purpose,a bench scale model of ST was prepared and operated continuously for 78 days at different detention times i.e.,48,24 and 12 h and at two reactor temperatures viz.15℃ and 25℃.Domestic wastewater was fed to the bench scale ST without pre-settling.Research was conducted under two different arrangements.Firstly,by installing baffles in the bench scale ST（called Run-1 setup）,and secondly by installing perforated plates between the baffles（called Run-2 setup）.Results demonstrated that Run-2 setup is better than Run-1 setup.Temperature significantly affects the efficiency.Detention time of 24 h was found feasible.Run-2 setup demonstrated a percentage BOD removal of 45%with effluent BOD of 113 mg·L^-1 at 15℃ and 85%removal with effluent BOD of 31 mg·L^-1 at 25℃.It is concluded that if a modified design of ST using Run-2 setup is provided at household level,the effluent coming out of the house will meet the National Environmental Quality Standards（NEQS）when reactor temperature is close to 25℃.Development authorities are suggested to change their by-laws and make modified ST mandatory for all households.This may significantly reduce the cost and footprint of city level wastewater treatment plants being planned.

Design and Performance of a Controlled Environment Mini-chamber for Measuring Produce Quality Deterioration

To minimize losses between harvest and retail display, a system is needed to track temperature and RH exposure of fresh produce and predict its quality at each step of the distribution chain. With accurate models, such system could （1） identify problematic situations before losses occur; （2） become a management tool for decision makers; and （3） help quantify the real impact of individual inappropriate conditions. A project was initiated to develop models required for such a decision system. Because the data required to develop models were not available for most fruit and vegetables, a series of storage trials was planned for measuring changes in physiological and microbial quality, and development of physiological disorders and/or diseases, as a function of time, temperature and RH. To meet this objective, controlled environment mini-chambers were designed, built and instrumented for measuring the effect of traceable environmental conditions encountered during storage and transportation of fresh horticultural produce of similar size and shape as tomato. Detailed design and performance evaluation of these mini-chambers are presented.

The study of relationship between textile and garment market,industry cluster and regional economy development

China＇s textile and garment markets grown up with the development of reform and opening-up, they＇re well adapted to the national policy and economic environment in each period, and formed a large-scale development, played a positive role in promoting China＇s economy development. This paper has a research on the textile and garment market, industry cluster and regional economy, recognize textile professional market and regional economy as the main research object, industrial cluster as the intermediary variable. Establish textile and garment market, industrial cluster, regional economy as the main trunk of structural equation model and carry on the empirical analysis. From the empirical analysis, this paper find that the coefficient of textile and garment market effecting on industrial cluster is 0.91, and industrial cluster on regional economy is 0.93, that means results verify hypothesis relationships between the three of them Finally, according to each path coefficients, providing relevant suggestions for the Shanghai area development of textile and garment market, related industries cluster and regional economy development.

Influence of Excitation System＇s Parameters to the Power System Stability

Excitation system is one of the significant elements affecting the dynamic performance of electric power systems. The power engineering as area of science and industry is subjected to rapid modernization, which is caused by technological progress. However, not all elements of the power system are developing simultaneously. The old type of elements sometimes is sufficient to adapt old system to the new operational conditions. The work developed and proposed in this paper deals with analysis of possible optimization of synchronous generator＇s excitation system. Authors examined influence of excitation system＇s parameters to the dynamics of transient processes in the power system. Authors investigated optimal parameters of excitation system of the Kegums hydro power plant. For optimization of parameters objective functions were used. The problem of the mutual influence of excitation systems of neighbor power plants was investigated. Investigation of transient processes using developed model proved that optimization of excitation parameters improves efficiency of regulation of excitation system, damping of active power oscillation and in some cases can prevent out-of-step condition.

Development of a toy column model and its application in testing cumulus convection parameterizations

A single-column model is constructed based on parameterizations inherited from the Finite-volume/Spectral Atmospheric Model F/SAMIL and tested in simulations of tropical convective systems. Two representative convection schemes are compared in terms of their performances on precipitation types, individual physical tendencies, and temperature and moisture fields. The main difference between the two selected schemes is in their representation of entraining/detraining process. The Tiedtke scheme assumes bulk entrainment, while the Zhang–Mc Farlane scheme parameterizes entrainment/detrainment rates under the spectrum concept. Large-scale forcing and verification data are taken from the GATE phase III field campaign, during which abundant convective events were observed. Given the same triggering function and closure assumption, results show that entrainment/detrainment representation remains the dominant factor on the simulation of cumulus mass flux and of temperature and moisture fields. By analyzing sources and sinks of heat and moisture, this study reveals how parameterization components compensate for each other and make model results insensitive to parameterization changes in certain fields, thus suggesting the need to treat parameterizations as systems rather than individual components.

Towards automated software model checking using graph transformation systems and Bogor

Graph transformation systems have become a general formal modeling language to describe many models in software development process.Behavioral modeling of dynamic systems and model-to-model transformations are only a few examples in which graphs have been used to software development.But even the perfect graph transformation system must be equipped with automated analysis capabilities to let users understand whether such a formal specification fulfills their requirements.In this paper,we present a new solution to verify graph transformation systems using the Bogor model checker.The attributed graph grammars(AGG)-like graph transformation systems are translated to Bandera intermediate representation(BIR),the input language of Bogor,and Bogor verifies the model against some interesting properties defined by combining linear temporal logic(LTL) and special-purpose graph rules.Experimental results are encouraging,showing that in most cases our solution improves existing approaches in terms of both performance and expressiveness.