ANALYSIS OF INJECTION MOULDING OF CERAMICS COMPOUNDS BY THE THEORY OF SYSTEMS
The main purpose of this paper is to present the theoretical systemic analysis of injection moulding of ceramic compounds (CIM) with Rophol’s theoretical definitions. The systemic analysis also includes the making of a basic model of CIM. The main principles of CIM and all phenomena connected with the process are represented by means of inputs, outputs and relations. This systemic analysis will be used as a base for easier understanding of this new technology of injection moulding.
The systemic analysis of metal injection molding
The study carried out comprises the making and description of the general model for metal injection moulding and the analysis of mentioned process with Ropohl’ s theoretical definitions. The model includes a complex of elements of metal injection technology, the elements being the core of the model, and the inputs, outputs and relations between the above-mentioned elements. The basic principles of this technology and all the phenomena connected with MIM are represented by means of inputs, outputs and relations. An exact analysis of metal injection moulding was made by a precise and systematic approach.
Turbine blade temperature calculation and life estimation - a sensitivity analysis
Abstract The overall operating cost of the modern gas turbines is greatly influenced by the durability of hot section components operating at high temperatures. In turbine operating conditions, some defects may occur which can decrease hot section life. In the present paper, methods used for calculating blade temperature and life are demonstrated and validated. Using these methods, a set of sensitivity analyses on the parameters affecting temperature and life of a high pressure, high temperature turbine first stage blade is carried out. Investigated uncertainties are: (1) blade coating thickness, (2) coolant inlet pressure and temperature (as a result of secondary air system), and (3) gas turbine load variation. Results show that increasing thermal barrier coating thickness by 3 times, leads to rise in the blade life by 9 times. In addition, considering inlet cooling temperature and pressure, deviation in temperature has greater effect on blade life. One of the interesting points that can be realized from the results is that 300 hours operation at 70% load can be equal to one hour operation at base load.