This chapter focuses on the processes in which polyester is usually used for the manufacturing of mechanical components and assemblies. Various methods of manufacturing these products are mentioned in this chapter. These methods include wet layup method, filament winding, pultrusion, vacuum bagging and autoclave curing, resin transfer molding (RTM) and vacuum-assisted resin transfer molding (VARTM). Various production levels and properties can be achieved by polyester resin using abovementioned processes. Each process has its own benefits and disadvantages, which are discussed in this chapter. Furthermore, the use of polyester in making electrical insulation is also discussed in the chapter. Advantages and disadvantages of each impregnation technique are also explained.
This paper discusses designing and implementation of an efficient Electric Power Supply System (EPS) for a Micro Satellite. Design and analysis of satellite different subsystems such as power generation, distribution and management, power storage, modules protection, bus voltage regulation and battery charging for micro-satellite have been discussed in detail. To perform all these duties whole EPS is divided into three units i.e. Solar Power Unit, Power Conditioning Unit and Power Distribution Unit. Each unit is an isolated system, has a local controller and standard inputs/outputs, connected with the Satellite main computer through standard buses (CAN buses) and can be attached/detached from the Satellite as separate unit. All the subsystems are based on Commercial off the Shelf (COTS) Components which were selected on the bases of small dimensions, low power consumption and lesser weight. Different techniques have been utilized for overall system size miniaturization and efficiency improvement i.e. the design solar panel converter is MPPT based. The main design criteria is modularity, redundancy, power efficient and scalability, simple as possible, avoid single component failure and maximum utilization of the existing heritage.
We propose an indirect method of ASTM D-1200 for measurement of viscosity from 0.1 to 30 stokes (St) using Ford cup 5 (range 2~ 12 St) by developing a statistical relation. General purpose low styrene content polyester resin (without adding initiator, hardener and accelerator) was used for viscosity measurement. In existing ASTM D 1200 standard, ford cups (1-4) are used to measure the viscosity up to 2 St, while fifth cup is used for measurement from 2 to 12 St. Viscosity above 12 St is not estimated using existing ASTM D- 1200 method. In contrast, our method and statistical relation proposed in this paper estimates viscosity in the flexible range of 0.1 to 30 St by using Ford cup 5 only. The estimated values were confirmed by existing ASTM D-1200 (0.1 to 12 St) and by using Ubbelohde viscometer (12 to 30 St). Values estimated above 12 St are from the proposed model are also in good conformance (percentage error ~ 5% or less) with experimental results. The satisfaction level of the estimated values with the experiments suggests that the model has also the potential for application to paints, polymer and oil industry.
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