A Practical Approach of Developing Mathematical Model for All Speed Governors

The paper introduced a special approach for diesel‘s all-speed-governor modeling, which, in some cases,could solve the knotty problem frequently met in computer simulation of diesel propulsion system or diesel generating set. Suppose that it is hard to get a control-oriented governor mathematical model when the general approaches, the analytical approach or the experimental approach, are applied, and that an open-loop step response of the diesel engine and its system is available by means of computer simulation, the critical three parameters of a governor mathematical model, the proportional gain Kp, integral time constant Ki, and derivative time constant Kd, can be determined by use of PID tuning method which are widely applied in industrial process control. This paper discussed the train of thought of the approach, precondition, procedure, several modifications of the classical PID model, and some points for attention. A couple of case studies were given to demonstrate the effectiveness of this approach.     

Public access to the shoreline: The Rhode Island example

Abstract

Competition for the use of our nation's shoreline has produced a thorough analysis of means to accommodate the increased demands of the public for access to the shore. The issue of public access in Rhode Island is considered at three levels. First, Rhode Island cases involving common law doctrines, such as the public trust, dedication, and so forth, are examined for their relevance. Second, the effect of the federal government in Rhode Island through the Coastal Zone Management Act and its amendments is studied. Finally, two types of state management programs are considered—a Commission for the Discovery of Rights of Way and the Coastal Resources Management Council.