It is common to use sound insulation as a last resort for noise control in an urban city. Sound insulation of air-conditioned building is of importance. The stiffeners have important effects on the sound insulation properties of a stiffened structure. The experimental studies on the stiffened structures are vital for the study of the stiffener effects. Based on this concern, a simple stiffened ...

Several practical issues must be considered when solid electrical insulation is used in a low pressure environment. While the low pressure environment or partial vacuum (in this context, a region which is almost devoid of any gaseous media) can exhibit good electrical insulating properties, the materials contained within the partial vacuum will effect the insulation integrity over time. Degrada...

Numerous studies have estimated the optimum thickness of thermal insulation materials used in building walls for different climate conditions. The economic parameters (inflation rate, discount rate, lifetime and energy costs), the heating/cooling loads of the building, the wall structure and the properties of the insulation material all affect the optimum insulation thickness. This study focuse...

In modern propulsion applications of tractions drives, voltage source inverter-fed three phase AC machines are preferred due to their flexibility and high dynamic torque properties. However, the fast switching of the inverter (high dv/dt rates) causes increased stress for the motor windings and leads to insulation degradation. Thus, insulation condition monitoring is getting more and more impor...

Magnet coil insulation consists of inorganic materials such as glass fiber, fillers, and organic thermosetting resins. Most of the usual insulation systems are damaged if subjected to high radiation levels such as those anticipated at the Stanford Linear Accelerator, where the expected dose rate may be as high as lOi rads per year. This paper describes tests carried out at SLAC in which several...

In this study, a new technical process for hardening wood fiber insulation boards is introduced. During the dry-process, the fibers are usually glued with polymeric-diphenylmethane-diisocyanate (pMDI) and hardened to wood fiber insulation boards using a steam-air mixture. However, the maximum temperature reached in the steam-air process was 100 °C, and it was impossible to use an alternative bi...

One of the cardinal properties of the insulation system of the electrical equipment is its electrical strength. Usually it is expressed as value of breakdown voltage. There is not electrical destruction of material under this one. The determination of breakdown voltage exactly is possible only by doing electrical strength test. It is a destructive test on insulation system made by solid materia...