Nickel based superalloy material is used for the design of dampers in steam and gas turbine. Parametric study of rubbing velocity, contact pressure and contact temperature influence on Nickel based superalloy material coefficient of friction and wear analysis. Friction is not desirable in machines, but it is desirable in design parameter for brakes and clutches. In the present paper, an experimental investigation is carried to find out the coefficient of friction and wear rate of Nickel based superalloy material. Experiments are carried by using a pin on disk apparatus on different diameter pins and disks of the same material. The experiments are carried on normal load ranging from 10 to 200N, speed varies from 200 to 2000 rpm and, wear track diameter ranging from 5 to 160 mm. Thus, the coefficient of friction and wear rate were studied with varying normal load at a constant rubbing velocity for different diameter pins. Thereafter the coefficient of friction and wear rate studied at a constant normal load with varying rubbing velocities for different diameter pins. By varying normal load at constant rubbing velocity it is observed that coefficient of friction decreases and wear rate increases for all diameter pins

In order to reduce the electric consumption for high intensity discharge lamps, the use of high frequencies electronic ballasts represents both a solution and many advantages such as the decrease in the congestion and low costs. However, high frequency operation is not regarded as perfectly reliable due to the appearance of acoustic resonances inside the arc tube, which can result in low frequency light flicker and even lamp destruction. Therefore a predictive model was established in order to give us at which frequencies light flicker can be expected. Moreover, we conducted an experimental study, which allows the electrical detection of frequency regions, in which the discharge arc behaves instable. Furthermore, an optical system is incorporated to record images of the discharge arc during stable and instable operating conditions. The results enable a considerably better understanding of the flicker phenomenon in HID lamps and facilitate the development of energy efficient drivers.

In order to reduce the electric consumption for high intensity discharge lamps (HID), the use of high frequencies electronic ballasts represents both a solution and many advantages such as, the decrease in the congestion, low costs and weak losses, approximately 10%. However it is not regarded as perfectly reliable, this is due in a great part to the appearance of Acoustic Resonances inside the arc tube which can result in low frequency light flicker and even lamp destruction. Experimentally we used a HID lamp of 50 W and we determined, light flicker frequencies and the arc motion frequencies using a photodiode which detects the light intensity fluctuation and a camera to record the arc motion. The experiment was done in the Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences.

<p>In order to reduce the electric consumption for high intensity discharge lamps, the use of high frequencies electronic ballasts represents both a solution and many advantages such as the decrease in the congestion and low costs. However, high frequency operation is not regarded as perfectly reliable due to the appearance of acoustic resonances inside the arc tube, which can result in low frequency light flicker and even lamp destruction. Here we experimentally determined light flicker frequencies using a photodiode which detects the light intensity fluctuation for a high intensity discharge lamp of 50W. Additionally, the arc motion frequencies<strong> </strong>are determined with the aid of a camera. The results obtained are compared with those of a lamp of the same type but with different power (35W).</p>