Force control by flexible manipulator based on resonance ratio control using position sensitive detector

Seiichiro Katsura, Kouhei Ohnishi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


This paper presents a novel force controller to suppress torsional vibration of two-mass resonant system. The resonance ratio control is one of the effective control methods of two-mass resonant system. In this method, the ratio between the resonant frequency of motor and arm is determined arbitrary according to the feedback of estimated reaction torque. The reaction torque is estimated by using position sensitive detector (PSD). Since the estimation method does not need the parameter identification, the torsion information is obtained with accuracy. To attain the affinity and adaptability to environment, motion systems should control the reaction force from the environment. In the force control system, the force response is regarded as a disturbance of the arm portion. The arm disturbance is observed by the arm disturbance observer. The proposed force control system is based on both the conventional PD control and the resonance ratio control and the determination method of pole placement is discussed. The proposed force control system can realize both the suppression of the inner torsional reaction torque and the adaptation to outer force inputs. The numerical and experimental results show viability of the proposed method.

Original languageEnglish
Pages (from-to)693-699
Number of pages7
Journalieej transactions on industry applications
Issue number6
Publication statusPublished - 2006


  • Disturbance observer
  • Flexible manipulator
  • Force control
  • Motion control
  • Two-mass resonant system
  • Vibration suppresion

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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