The parabolic reflector is used in directed acoustic systems, with the aim of
gettingdirectivity, as well as increasing the gain in transmission and reception.
Therefore, a theoretical study was carried out to describe the factors that affect the g
ain
of the parabolic dish in the acoustic field. The frequency-gain relationship was
experimentally obtained using a parabolic dish with an elliptical aperture, in addition to
the analysis of the factors that led to the deviation of the experimental relationship from
the theoretical relationship.
radiation pattern
الأنظمة الصوتية الموجهة
ربح الطبق
المخطط الإشعاعي
directed acoustic systems
dish gain
العاكس القطعي المكافئ
الربح الاتجاهي
الربح الصوتي
الاتجاهية
عرض حزمة نصف الاستطاعة
كفاءة الفتحة
parabolic reflector
acoustic gain
directional gain
directivity
half power beam width
aperture efficiency
المزيد..
Hydraulic drives are able to generate high forces and move large loads. With the help of proportional
valves, it is possible to control movements fast and accurately.
Depending on the application, a linear cylinder, a rotary cylinder or a rotary mo
tor are used. Linear
cylinders are most frequently used. The following designs are therefore confined to this type of drive. We
compare among various types of cylinders which are common by used. We compared different conditions
for cylinders with friction and without it.
