摘要:

abstractThe performance of an electric vehicle has long been a feature that is fully measured only empirically. This paper presents an approach to computer simulation of electric vehicle performance, and consists of a basic system assumption, the development of the model and performance algorithm, and the flow chart for simulation software.In the basic system design the desired vehicle speed and acceleration are the only operator controlled parameters. Based on the difference between the desired and the actual speed, through feedback loops, independent adjustments are made to the motor armature and field voltages. Through this mechanism the power delivered to the motor, needed to meet the instantaneous speed and torque requirements, is minimized.The electric vehicle model represents the system’s electricsl characteristics, that is battery charger, battery, motor and controller parameters. In addition, the model has provisions for the consideration of external parameters, such as road friction and steepness, wind as well as vehicle payload.Some of the model's outputs are the vehicle’s actual speed, the exerted torque, the instantaneous power dissipation, the driven miles since time zero, the charge remaining in the batteries and the remaining expected average miles that can be driven.The simulation algorithm flow chart shows the effect of system parameters on system performance, and serve as the basis for the development of the necessary computer software.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759887

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractThe paper illustrates a modern CAD approach (useroriented) for the interactive dynamic simulation of multimasses systems. The mathematical model has almost no restrictions on the displacements amplitudes and considers all the 6 degrees of freedom for each mass. The program runs on a small size computer and offers also to a nonspecialized designer the possibility to solve exactly a wide number of problems in the field of dynamics and vibrations.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759888

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractKey issues associated with microprocessor implement tion of a path tracking controller for a robotic manipulator are discussed. The control law is derived from a discretization of a continuous one guaranteeing the boundedness of the tracking error in the presence of bounded parameter variations. The effect of the sample time, that of del y time necessary for on-line computations and A/D D/A conversions, and the influence of limited word-length of the converters on system performance is firstly theoretically n lyzed and then investigated by means of computer simulations.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759889

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractAssuming thst the number of hazard events exeeding some selected base value per year follows either a Poisson or a Negative Binomial distribution and their magnitudes are independent and identically distributed, one formulates the Poisson and Polya models for the maximum depths of daily rainfall. Correspondingly the distribution of largest magnitudes of hazard events and the relationship between two return periods based respectively upon the annual maxima and partial-duration series are established. Application to several data sets in Thailand indicates that the Poisson model is more appropriate.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759890

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractAssuming thst the number of hazard events exeeding some selected base value per year follows either a Poisson or a Negative Binomial distribution and their magnitudes are independent and identically distributed, one formulates the Poisson and Polya models for the maximum depths of daily rainfall. Correspondingly the distribution of largest magnitudes of hazard events and the relationship between two return periods based respectively upon the annual maxima and partial-duration series are established. Application to several data sets in Thailand indicates that the Poisson model is more appropriate.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759891

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractThe Social Security Amendments of 1983 (Public Law 98–21) have changed the way hospitals will be reimbursed for Medicare inpatient services. Hospitals will be reimbursed under a prospective payment system based upon Diagnosis Related Groups (DRG’s). This added emphasis on DRG's requires hospitals to develop reliable forecasting models for total days inpatient care by DRG to support revenue forecasts for budgeting and operating planning functions. This study develops a modelling approach using Box–Jenkins time series and regression with seasonality variables and develops 6-month forecasts for total inpatient days using representative DRG data.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759892

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

摘要:

AbstractA method for stochastic estimation of rainfall depths to improve hydrological flood forecast has been developed by use of the continuous Markov–process. Mass curves of rainfall events characterized by a moderate average increasing during the total storm time are interpreted as realizations of a Markov–process of continuous type. By an analysis of rainfall mass curves ~ransformed to zero mean and standard deviation of unity, it was found that the rainfall ordinates can be assumed as normally distributed. Analytical functions of time were adapted to empiricm functions of mean, variance and autocorrelation. A formula is given to compute the conditional mean and the conditional ~ensity, with which rainfall depths can be estimated independent of actual fallen rain.The model can be used for hydrological application to improve forecasting of flood occurences in conjunction with a rainfall runoff model.

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759893

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor

ISSN:0228-6203    

DOI:10.1080/02286203.1984.11759875

出版商:Taylor&Francis    

年代:1984

数据来源: Taylor