机械通风自动控制系统研制试验

本文对机械通风自动控制系统进行了研制，并用于实仓试验。试验结果表明，该系统可提高工作效率，减轻劳动强度，节约能耗。     

实验室粮食样品自动分样器的研制

论述了实验室粮食样品自动分样器的工作原理、取样流程、结构组成和设备特点。该设备通过机电一体化设计,模拟人工分样,实现了粮食样品分样的自动化,降低了劳动强度,保障了质检人员的健康安全,开发后将成为各级质检机构必备的粮食样品前处理设备。     

进口大豆入仓自动分级特性研究

通过对不同国别、不同质量进口大豆入仓杂质分布的差异性分析研究,表明进口大豆产地和杂质含量对杂质的均布有一定的影响,且杂质含量的影响大于产地国别影响;大豆入仓自动分级后杂质大多数聚集在中心直径10m的圆形区域内,其中杂质中的大杂是主要的贡献因子,小杂次之,鉴于此提出浅圆仓防分级设备研发方向。     

储粮智能化通风控制数学模型

在<储粮机械通风技术规程>的基础上,结合储粮通风过程中粮温层次变化规律,对储粮通风过程的控制条件进行了修正,系统设计了储粮智能化通风控制数学模型,使储粮通风控制更加精确和合理,模型对人工控制的储粮通风操作也具有指导作用.     

AUTOMATIC CONTINGENCY SELECTION AND RANKING USING AN UNIFIED MODEL AND ALGORITHM FOR P - AND Q - SUBPROBLEM

A new approach of the automatic contingency selection and ranking with the network flow programming (NFP) is presented in this paper. NFP is adaptable to change the network topology as the transmission or generation branches arc in single or multiple outage. Thus the fast calculation of the contingency states by NFP cm provide the urgent information in real time N- 1 security analysis. In the paper, automatic contingency selection and ranking forP- and Q-type subproblem arc solved by an unified network flow model and algorithm. It is based on the existence of weak coupling between real and reactive quantities in power systems. The performance indices to assess the severity of contingencies are defined as the total real and reactive load required to be curtailed. The proposed ACS technique including the model and its algorithm are examined with IEEE 5-, 14-, 30-, 57- and 118- bus test systems on M-340. And the encouraging results are given in the paper.     

大型粮食干燥塔的自动控制

本文通过DM—150型干燥过程控制仪在DLG－500型干燥塔的成功应用,详细介绍了该自动控制系统的原理、性能、特点、操作过程及使用效果．     

MATHEMATICAL MODEL OF CAPACITANCE SENSOR FOR MOISTURE MEASUREMENT

This paper presents a theoretical mathematical model of capacitance sensor for moisture measurement. The practical mathematical model is provided using least squares theory, an applied example shows higher accuracy of the model.     

AN APPLICATION OF ANALYTIC HIERARCHY PROCESS TO AUTOMATIC CONTINGENCY SELECTION AND RANKING

This paper presents an approach to study the problem of automatic continency selection and ranking with the analytic hierarchy process, and takes into consideration the relative importance of transmission lines and the situation that the real and reactive power security constraints are violated as the line outage appears. Thus, the precise information in the real time security analysis and economic dispatch can be provided.     

AUTOMATIC MESH-GENERATING ALGORITHM IN THREE-DIMENSIONAL FINITE ELEMENTS ANALYSIS

This paper presents two kinds of algorithms for generating the meshes automatically in three-dimensional finite element analysis. The method can be used in analysing those components configured by three-dimensional solidity, multi-connective regions and rotary shell with arbitrary generatrix. In the end, two examples demonstrated are given.     

THE DEVELOPMENT OF MODEL CL256 MOS IMAGE SENSOR

Model CL256 MOS Image Sensor is a newly developed solid image sensor, called self-scanned photodiode array(SSPD)abroad. Silicon gate P-MOS technique has been adopted in developing the device ,and a kind of three FETS dynamic circuit with varactor bootstrap has been adopted in developing the shift register used as scanned circuit. The circuit has the advantages of high speed and low power consumption. It is very important in developing high-oder digit SSPD devices.     

AN AUTOMATIC VOLTAGE REGULATOR USING IDENTIFIED MODELS

This paper obtains the mathematical model of a single machine infinite bus power system using the idea of parameter identifications. Because the noise is considered in parameter identification process, the model reflects the real system more exactly. On the base of the identified model this paper also presents a discrete automatic voltage regulator by minimum variance control principles. In order to avoid the static error, we combine discrete minimum variance control with continuous integral control and get very satisfactory effects. This proposed control strategy is very easy to realize. The simulation results show that in every case the dynamic qualities of the proposed control strategy are incomparably superior to that of the conventional PI regulator, which means the proposed control strategy has great practical values.     

BAND DAMAGING CRACK MODEL OF CONCRETE

This paper presents a fracture model of concrete,band damaging crack model (BDCM).The BDCM can be used to analyze mechanical behaviour of concrete effectively and easily.Compared with test results;numerical results calculated by the BDCM are very precise.     

新型自动土壤水分传感器与传统FDR法传感器性能对比分析

本文在传统FDR法自动土壤水分传感器基础上,通过重新设计测量电路,开发了一种新型自动土壤水分传感器,并在实验室内开展了新型传感器电气性能、测量性能、抗温度变化特性、抗盐碱性能等传感器特性与传统FDR法自动土壤水分传感器的对比分析或试验。通过对比分析或试验,结果表明：新型自动土壤水分传感器可以实现土壤水分的连续监测,满足传感器的测量性能需求;新型自动土壤水分传感器与传统FDR法自动土壤水分传感器相比,标定过程相对简单、测量精度及测量准确性更高、抗干扰性更强、稳定性更高。新型自动土壤水分传感器的研发设计,提高了土壤水分监测的准确性、稳定性,为自动土壤水分观测仪的升级换代提供了技术支撑。     

A PRELIMINARY STUDY OF THE AVERAGE SKY BRIGHTNESS MODEL

Starting from the optical factors of Climate and on the basis of CIE formulasof brightness distribution for clear and overcast sky,this paper suggests a kindof formula which can be used to compute brightness distribution on average skybrightness.Besides,it proposes a simple method by which it is easy to carryout the design of natural lighting under the condition of average sky brightnessmodel.     

THE DEVELOPMENT OF ON-LINE AUTOMATIC MEASURING EQUIPMENTS OF INCREMENTAL LINEAR SENSORS

The auto-measurement of incremental linear transducer by a micro-computer is described and the data of the incremental linear transducer are gained by a computer. Under the control of the computer programme, the on-line datum processing is done and the power spectrum of the data is analyzed by the computer. Thus the auto-measurement of the incremental linear transducer is realized.     

A MODEL SYSTEM OF A LONG-TERM PROGRAM OF EDUSATION DEVELOPMENT AND ITS APPLICATION

This paper studies a long-term program of education development in the light of the theory and method of system engineering.A complete mathematical-Simulant model system is used to describe the internal regularity of an edu-cation system inside a social-economic tystem,and to put forward a set of efficient method for education development programming.The mathematical-simulant model system dis-cussed in the paper is put to practical use in a regional education programming.     

粮仓窗户远程自动控制系统设计

设计出一种粮仓窗户远程自动控制系统。根据仓内外的温度和湿度变化,自动开启或关闭窗户及通风机械,实现粮仓的自动通风,自动控制。该系统可与粮情检测系统、通风控制系统等结合,组成粮仓自动化管理系统。     

ZC—4型微机测温测湿系统在粮情检测中的应用

文章报导了ZC—4型微机测温测湿系统在储粮检测中的应用情况。结果表明:该系统重复测量稳定性好,能准确有效地反映粮堆内部不同部位的温度变化及仓内外相对湿度的变化情况;测量快速、方便,储量大,节约费用,具有明显的社会效益和经济效益。     

A MATHEMATICAL MODEL OF FUZZY EVALUATION METHOD FOR ENVIRONMENTAL POLLUTION

The problem of fuzzy evaluation of environmental pollution is importantboth in environment science and in environmental protection.Usual evaluationmethods have their own characteristics.This paper puts forward a mathematicalmodel of fuzzy evaluation method in grades by means of systematic analysisfor environmental pollution.At the same time,it assigns weighted values byordering based on paired comparison.