Michał Pająk

A method for determining the usability potential of ship steam boilers

Abstract Ship large-power steam boiler may serve as an example of complex critical technical system. A basis for rational control of operation of such system is knowledge on its capability of fulfilling the tasks to which it was intended. In order to make it possible to apply computer aiding to operational decision-making the capability should be described analytically. In this paper it was proposed to express the capability of ship steam boiler ( considered a complex system) to perform service tasks, by calculating components of its usability potential in a given instant t. To this end , was distinguished a set of steam boiler fundamental features which formulate space of its technical states. Values and characteristic intervals of the features were defined and this way sub-spaces of serviceability and non-serviceability states of the object in question were determined. Next, in the considered space, technical state of the boiler and its usability potential was determined. Owing to this it become possible to quantitatively express the steam boiler functioning capability which served as a basis for elaborating an algorithm for controlling the operational processes of a complex technical system under action. In this paper is also described a way of application of the presented method to calculation of ship steam boiler usability potential, which may be especially instrumental in the case of operational control of the boilers of the kind , equipped with interstage reheaters, i.e. those operating with high values of operational parameters.

Telematics Application to Optimize Operation Process of Municipal Heat and Power Plant

Abstract Municipal heat and power plant is a complex and huge industrial system. The main elements of the system are the heating boilers. To perform the operation process of the boilers efficiently it is necessary to monitor a wide range of operation parameters in a real time. Great number of the parameters, short response time and big distance between the controlled objects are the main reasons for telematic systems implementation. But, the basic conditions of telematic system application are: measurement instruments and proper control algorithm. Nowadays, heating boilers are equipped with measurement systems by the producer. The heating boilers are very expensive devices whose operation phase is very long. Therefore, in many municipal heat and power plants, the production process is carried out using old type heating boilers. In such cases telematic systems should operate in spite of limited measurement vector. To do this, special control procedures ought to be implemented. In the paper, the heating boiler control algorithms are presented. Described algorithms are used in case of real industrial objects where a set of monitored parameters is not sufficient for executing full automatic control. An expert system dedicated to support the operation process of heating boiler is also presented. Because of limited information about the heating boiler operation, the process is controlled approximately. To deal with the indicated problem, the idea of fuzzy sets implementation is also described. The presented method of control process fuzzification can increase the quality of heating boiler operation. It will make the implementation of power industry telematics more efficient.

Method of Building a Model of Operational Changes for the Marine Combustion Engine Describing the Impact of the Damages of This Engine on the Characteristics of Its Operation Process

Abstract This article deals with the modeling of the processes of operating both marine main and auxiliary engines. The paper presents a model of changes in operating conditions of ship’s internal combustion engine. The semi-Markov decision process was used to mathematically describe the process model of the engine. The developed model describes the effect of engine damage on the characteristics of its operation. A change in the input parameters of the model can simulate the influence of internal and external factors on the course of the analyzed process. A simplified calculation example is also presented for illustration purposes. The presented method together with developed algorithms and IT tools can be used to solve a wide range of problems related to the operation of marine main engines and other marine equipment as well as maritime and port facilities. This concerns primarily the economic, risk management and operational security issues of complex technical systems, as well as the readiness and reliability analysis of technical facilities.

Use of Analtic Hierarchy Process for Assessment of Transport System Operation Safety

Transport systems are socio-technical systems in which accomplishment of a direct task is the responsibility of an executive subsystem made up of elementary subsystems of the type—technical object (operator–transport means) carrying out tasks within the system surroundings. Due to the presence of people in the transport system, the most significant criterion for the assessment of carried out rides is their safety. The safety level of carried out transport tasks is affected by threats posed by forcing factors which have an influence on the elementary executive system. These factors can be divided into: (1) operational; (2) external; and (3) antropotechnical. Due to the complex nature of the analyzed systems, the authors of the paper have made an attempt to evaluate the influence of these factors on the system operational safety.Transport systems are socio-technical systems in which accomplishment of a direct task is the responsibility of an executive subsystem made up of elementary subsystems of the type—technical object (operator–transport means) carrying out tasks within the system surroundings. Due to the presence of people in the transport system, the most significant criterion for the assessment of carried out rides is their safety. The safety level of carried out transport tasks is affected by threats posed by forcing factors which have an influence on the elementary executive system. These factors can be divided into: (1) operational; (2) external; and (3) antropotechnical. Due to the complex nature of the analyzed systems, the authors of the paper have made an attempt to evaluate the influence of these factors on the system operational safety.