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PARALEL MEKANİZMALARIN KİNEMATİĞİ, DİNAMİĞİ VE ÇALIŞMA UZAYI

Journal Name:

  • Havacılık ve Uzay Teknolojileri Dergisi

Publication Year:

  • 2005

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Keywords (Original Language):

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Abstract (2. Language): 
This paper summarizes the current state of affairs in the area of paralel mechanisms, their overall properties, kinematics, dynamics and workspace analysis; and makes suggestions on possible research areas that have not been explored yet. Piloting trainees train on flight simulators before flying the actual aircraft, so that training time and losses are minimized. It is vital for piloting trainees to sense the translation and rotation motions of the simulator just as they would in a real aircraft. The motion that a pilot would be exposed to while flying a real aircraft is provided by a paralel mechanism placed under the simulator. A slightly modified version of the 6 degree of freedom paralel platform mechanism suggested by Stewart in 1965 is used for this purpose. Due to their architecture, paralel mechanisms have higher natural frequencies, stiffness, speed, nominal loading capacity and precision, when compared to serial mechanisms, whereas their workspaces are smaller than those of serial mechanisms. The Stewart Platform Mechanism (SPM), is comprised of a hexagon shaped fixed base platform and a movable platform linked via six legs whose lengths can be changed using prismatic joints. The legs can be attached to the platforms using revolute or spherical joints, though universal joints are often used. The actuators that change leg lengths are on the base. SPM can move in three translational and three rotational directions.
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Abstract (Original Language): 
Bu çalışmada, paralel mekanizmaların genel özellikleri, kinematik, dinamik ve çalışma uzayları hakkında bugüne kadar yapılan çalışmaların bir özeti verilerek ileriye yönelik önerilerde bulunulmuştur. Havacılık sahasında, pilot adayları, uçakla uçuş eğitimine başlamadan önce simülatörlerde eğitim görmektedirler, böylece eğitim kayıpları ve zamanı en aza indirilmektedir. Simülatörlerdeki eğitimler esnasında, pilot adaylarının ötelenme ve dönme hareketlerini gerçeğe yakın hassasiyette algılamaları çok önemlidir. Gerçek bir uçakta uçarken pilotun maruz kalacağı hareket, simülatörün altında bulunan bir paralel mekanizma ile sağlanır. 1965’te Stewart’ın uçuş simülatörü olarak önerdiği 6 serbestlik dereceli paralel platform mekanizmasının modifiye edilmiş hali bu işte kullanılmaktadır. Paralel mekanizmalar, mimarilerinden dolayı, seri mekanizmalardan daha yüksek doğal frekansa, katılığa, çalışma hızına, nominal yüklemeye ve hassasiyete sahiptir, ancak çalışma uzayları daha küçüktür. Stewart platform mekanizması, SPM, boyları prizmatik eklemler vasıtasıyla değişebilen 6 bacak ile birbirine bağlı altıgen biçimli bir sabit platform ve bir hareketli platformdan oluşmaktadır. Bacaklar platformlara genelde üniversal mafsallarla bağlı olmakla beraber, dönel veya küresel mafsallar da kullanılabilir. Bacakları hareket ettiren eyleyiciler sabit tabandadır. SPM üç yönde öteleme ve üç yönde dönme yapabilmektedir.
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