• A multi degree of freedom actuation

      Elvis Ashu, Mfortaw; Shafik, Mahmoud; Oraifige, Ilias; University of Derby (IOS Press, 2016-09)
      This paper presents the on going research to develop an actuation system with multi-degree of freedom, for robot and machine vision industrial applications. This is mainly aiming to overcome the current teething issues with digital visual transducer spot angle and enhance the relevant industrial applications performance and accuracy, at low cost. This paper is focused on the actuation system design and development. It covers the actuation system design optimisation, structure, and working principles. Finite element analysis has been used in the design optimisation process. This has been utilised to test the actuation system structure, investigate the dynamic behaviour and the deformation of the stator (active piezo-ceramic electrodes). The initial analysis and experimental results of the work is also presented in this paper and this is showed the potential of the current development.
    • A smart 3D ultrasonic actuator for unmanned vehicle guidance industrial applications

      Shafik, Mahmoud; Ashu, Mfortaw, Elvis; Nyathi, B.; University of Derby (UNSYS Digital, 2015-08-26)
      A smart piezoelectric ultrasonic actuator with multidegree of freedom for unmanned vehicle guidance industrial applications is presented in this paper. The proposed actuator is aiming to increase the visual spotlight angle of digital visual data capture transducer. Furthermore research are still undertaken to integrate the actuator with an infrared sensor, visual data capture digital transducers and obtain the trajectory of motion control algorithm. The actuator consists of three main parts, the stator, rotor and housing unit. The stator is a piezoelectric ring made from S42 piezoelectric material, bonded to three electrodes made from a material that has a close Characteristics to the S42. The rotor is a ball made from steel material. The actuator working principles is based on creating micro elliptical motions of surface points, generated by superposition of longitudinal and bending vibration modes, of oscillating structures. Transferring this motion from flexible ring transducer through the three electrodes, to the attached rotor, create 3D motions. The actuator Design, structures, working principles and finite element analysis are discussed in this paper. A prototype of the actuator was fabricated and its characteristics measured. Experimental tests showed the ability of the developed prototype to provide multidegree of freedom with typical speed of movement equal to 35 rpm, a resolution of less than 5μm and maximum load of 3.5 Newton. These characteristics illustrated the potential of the developed smart actuator, to gear the spotlight angle of digital visual data capture transducers and possible improvement that such microactuator technology could bring to the unmanned vehicle guidance and machine vision industrial applications.
    • A smart ultrasonic actuator with multidegree of freedom for autonomous vehicle guidance industrial applications

      Shafik, Mahmoud; Ashu, Mfortaw, Elvis; Nyathi, B.; University of Derby (UNSYS Digital, 2015)
      A piezoelectric ultrasonic actuator with multidegree of freedom for autonomous vehicle guidance industrial applications is presented in this paper. The actuator is aiming to increase the visual spotlight angle of digital visual data capture transducer. It consists of three main parts, the stator, rotor and housing unit. The stator is a piezoelectric ring made from S42 piezoelectric ceramics material, bonded to three electrodes made from a material that has a close Characteristics to the S42. The rotor is a ball made from stainless steel materials. The actuator working principles is based on creating micro elliptical motions of surface points, generated by superposition of longitudinal and bending vibration modes, of oscillating structures. Transferring this motion from flexible ring transducer through the three electrodes, to the attached rotor, create 3D motions. The actuator Design, structures, working principles and finite element analysis are discussed in this paper. A prototype of the actuator was fabricated and its characteristics measured. Experimental tests showed the ability of the developed prototype to provide multidegree of freedom with typical speed of movement equal to 35 rpm, a resolution of less than 5μm and maximum load of 3.5 Newton. These characteristics illustrated the potential of the developed smart actuator, to gear the spotlight angle of digital visual data capture transducers and possible improvement that such micro-actuator technology could bring to the autonomous vehicle guidance and machine vision industrial applications. Furthermore research are still undertaken to develop a universal control prototype, integrate the actuator with an infrared sensor, visual data capture digital transducers and obtain the trajectory of motion control algorithm.