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Front. Inform. Technol. Electron. Eng.  2014, Vol. 15 Issue (12): 1164-1173    DOI: 10.1631/jzus.C1400120
    
A VHDL application for kinematic equation solutions of multi-degree-of-freedom systems
Hüseyin Oktay Erkol, Hüseyin Demirel
Department of Mechatronics Engineering, Faculty of Technology, Karabük University, Karabük 78050, Turkey; Department of Electrical and Electronics Engineering, Faculty of Engineering, Karabük University, Karabük 78050, Turkey
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Abstract  As kinematic calculations are complicated, it takes a long time and is difficult to get the desired accurate result with a single processor in real-time motion control of multi-degree-of-freedom (MDOF) systems. Another calculation unit is needed, especially with the increase in the degree of freedom. The main central processing unit (CPU) has additional loads because of numerous motion elements which move independently from each other and their closed-loop controls. The system designed is also complicated because there are many parts and cabling. This paper presents the design and implementation of a hardware that will provide solutions to these problems. It is realized using the Very High Speed Integrated Circuit Hardware Description Language (VHDL) and field-programmable gate array (FPGA). This hardware is designed for a six-legged robot and has been working with servo motors controlled via the serial port. The hardware on FPGA calculates the required joint angles for the feet positions received from the serial port and sends the calculated angels to the servo motors via the serial port. This hardware has a co-processor for the calculation of kinematic equations and can be used together with the equipment that would reduce the electromechanical mess. It is intended to be used as a tool which will accelerate the transition from design to application for robots.

Key words： Multi-degree-of-freedom systems      Kinematics      Co-processor      Serial communication      Six-legged robot     
Received: 01 April 2014      Published: 05 December 2014
CLC:  TN43  
  TP242  
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Hüseyin Oktay Erkol
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Cite this article:

Hüseyin Oktay Erkol, Hüseyin Demirel. A VHDL application for kinematic equation solutions of multi-degree-of-freedom systems. Front. Inform. Technol. Electron. Eng., 2014, 15(12): 1164-1173.

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http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C1400120     OR     http://www.zjujournals.com/xueshu/fitee/Y2014/V15/I12/1164


多自由度系统运动学方程求解的VHDL应用

针对多自由度系统的运动学计算复杂，在实时运动控制中，单处理器下获取计算结果耗费较长时间，且难以获取期望的精确结果，本文引入协处理器增加系统自由度。设计硬件并实现其在六足机器人运动中的应用。引入协处理器增加系统自由度，分担主处理器负载。根据六足机器人机械结构（图1）建立运动学方程。选择合适的串口、电机、芯片结构（图6）。用VHDL语言编写程序并在FPGA上测试。设计运动学协处理器用于六足机器人关节角度的计算。该协处理器包含内部串行端口，可与具有内部控制器和串口的电机配合使用。设计的硬件将运算得到的关节角度通过串口发送至六足机器人。并可以通过串口从主处理器获取必要的参数来计算关节角度。用VHDL语言编写并在FPGA上测试。所设计的硬件亦可以应用于其他机器人。

关键词： 多自由度系统,  运动学,  协处理器,  串行通信,  六足机器人 
[1] Zi-wu Ren, Zhen-hua Wang, Li-ning Sun. A hybrid biogeography-based optimization method for the inverse kinematics problem of an 8-DOF redundant humanoid manipulator[J]. Front. Inform. Technol. Electron. Eng., 2015, 16(7): 607-616.