Manyetik levitasyon sistemleri, mühendislik sistemlerinde sürtünmeyi en aza indiren çözümler sunduğundan, güncel çalışmalarına tabidirler. Bu çalışmada, yeni bir PI-PD kontrolcü tasarım prosedürü sunulmuştur. kontrolcüleri, PI (iç çevrim) ve PD (dış kombinasyonundan oluşur. İç çevrimin amacı, açık çevrim kararsız sistemi kararlı kılmaktır. Dış kapalı sisteminin toplam performans gereksinimlerin...

When a road design solution is quite out of standards for the presence insurmountable constraints, there need an objective procedure aimed at achieving certain level safety drivers. To avoid issues on judicial responsibility, designers aim to fully satisfy existing standards, possibly without any exception. Traditional methodologies based previous experience or administrators’ guidelines genera...

In order to establish the design method of a noncircular face gear (NFG) with intersecting axes, meshing theory this is investigated based on principle space meshing. A generalized approach for designing closed pitch curve NFG axes was proposed Fourier series. The mathematical model generated by shaper cutter established. fundamental parameters gears were defined, determining their values discu...

BACKGROUND Despite being the conventional choice, whole body PET cameras with a 76 cm diameter ring are not the optimal means of human brain imaging. OBJECTIVE In fact, a dedicated brain PET with a better geometrical structure has the potential to achieve a higher sensitivity, a higher signal-to-noise ratio, and a better imaging performance. METHODS In this study, a polyhedron geometrical d...

Tubular KT-joints are quite common in offshore structural design and despite the crucial role of stress concentration factors (SCFs) in evaluating the fatigue performance of tubular joints. However, the SCF distribution in internally ring-stiffened KT-joints have not been investigated and no design equation is currently available to determine the SCFs for this type of joint. In the present pape...

In thermoelectric coolers (TECs) applied external voltage potential is generated to a temperature difference based on the Peltier effect. Main and basic structure of TECs is in the form of single stage device. Due to the low efficiency, especially low coefficient of performance (COP) of thermoelectric coolers, optimal design of geometrical parameters of such devices is vital. For this purpose, ...