用交集域优选法辨识堆石坝材料参数

应用岩土力学、数理统计等理论 ,对鲁布革风化料心墙堆石坝变形观测资料进行了细致的分析 ,建立了数学模型 ,并将变形合理分解为填筑分量、水压分量和时效分量。通过对材料各参数与变形之间的关系分析和大量的有限元计算 ,按照交集域优选法的思想、辨识鲁布革堆石坝各区材料的非线性参数 ,结果令人满意     

PARAMETER IDENTIFICATION FOR MODELING RIVER NETWORK USING A GENETIC ALGORITHM

The simulation of a one-dimensional river network needs to solve the Saint-Venant equations, in which the variable parameters normally have a significant influence on the model accuracy. A Trial-and-Error approach is a most commonly adopted method of parameter calibration, however, this method is time-consuming and requires experience to select the appropriate values of parameter. Consequently, simulated results obtained via this method usually differ between practitioners. This article combines a hydrodynamic model with an intelligent model originated from the Genetic Algorithm (GA) technique, in order to provide an intelligent simulation method that can optimize the parameters automatically. Compared with current approaches, the method presented in this article is simpler, its dependence on field data is lower, and the model accuracy is higher. When the optimized parameters are taken into the hydrodynamic numerical model, a good agreement is attained between the simulated results and the field data.     

岩土工程安全监测异常值属性的识别方法

针对施工期间岩土工程安全监测系统具有不完善、干扰和影响因素多、人工监测比重大等特点，介绍了监测数据可靠性检查和异常值监测方法，在将异常值分为假异常、表观异常和征兆异常后，结合工程实践阐述了异常值属性的识别原则和方法，并以实例分析了常见的导致假异常和表观异常的原因。这些分析方法是监测数据处理系统的必要组成部分。     

IDENTIFICATION OF ABKOWITZ MODEL FOR SHIP MANOEUVRING MOTION USING e-SUPPORT VECTOR REGRESSION

By analyzing the data of longitudinal speed,transverse speed and rudder angle etc.in the simulated 10o/10o zigzag test,the hydrodynamic derivatives in the Abkowitz model for ship manoeuvring motion are identified by using ε-Support Vector Regression(ε-SVR) .To damp the extent of parameter drift,a series of random numbers are added into the training samples to reconstruct the training samples.The identification results of the hydrodynamic derivatives are compared with the Planar Motion Mechanism(PMM) test results to verify the identification method.By using the identified Abkowitz model,20o/20o zigzag test is numerically simulated.The simulated results are compared with those obtained by using the Abkowitz model where the hydrodynamic derivatives are obtained from PMM tests.The agreement is satisfactory,which shows that the regressive Abkowitz model has a good generalization performance.     

DETERMINATION OF HEAT AND MOISTURE TRANSPORT PROPERTIES IN WET POROUS MEDIA USING THEPARAMETER ESTIMATION METHOD

1.INTRODUCTIONtheheatandmoisturetransportpropertiesinwetporousmediaareessentialdatatodealwithmanyengineeringproblemsandarealsooneofthemostimportantresearchobjectivesinthefieldofheatandmasstransferinwetporousmedia.Althoughmanymethodshavebeendevelopedtoanalyzetheheatandmoisturetransportpropertiesinwetporousmedia,theexistingdataoftheheatandmoisturetransportpropertiesaresodeficientthatthedatacannotmeettheneedsfortheoreticalresearchandengineeringapplicationsbecauseofthecomplexityintheheatandmas…     

EXPERIMENTAL STUDY OF AN ANTI-EROSION METHOD FOR BEND IN G AS-PARTICLE FLOWS

NOMENCLATUREA　　　Width of duct(2 0 mm)AR H / WAs Section area of square pipe(mm2 )B Heightof duct(2 0 mm)Cv Volume two-phase densityCw Weight two-phase densityD Pipe diameter(mm)DL Hydraulic diameter of duct(mm)dp Average particle diameter(μm)dp Particle diameter(μm)Ea Anti-erosion rateEe Erosion rateEnre Erosion rate of bend no-ribbed specimenEnrse Erosion rate of no-ribbed straightpipe specimenEre Erosion rate of bend ribbed specimenErse Erosion rate of ribbed straight …