Separation and estimation of periodic/aperiodic state

Muramatsu, Hisayoshi

doi:10.1016/j.automatica.2022.110263

Cited by 3 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Derivation and design of the high-order PASFs are discussed in [8], and the transfer functions of the secondand third-order filters have second and third z operators in the z domain. The block diagram of the second-order and third-order PASFs is shown in Fig.…”

Section: Design Of Cutoff Frequency Time Constant and Ordermentioning

confidence: 99%

“…Their frequency characteristics have many band-stop characteristics, but they are difficult to design their cutoff frequencies, convergence speed, and high-order filters. Similar to the comb filter, a periodic/aperiodic separation filter (PASF) was proposed [9], which separates a signal into quasi-periodic and quasi-aperiodic signals defined in [8]. The first-order PASF can easily adjust its cutoff frequency and convergence speed [7], and the high-order PASF can perform more rigid harmonics elimination [8].…”

Section: Introductionmentioning

confidence: 99%

“…Similar to the comb filter, a periodic/aperiodic separation filter (PASF) was proposed [9], which separates a signal into quasi-periodic and quasi-aperiodic signals defined in [8]. The first-order PASF can easily adjust its cutoff frequency and convergence speed [7], and the high-order PASF can perform more rigid harmonics elimination [8]. The PASF is composed of periodic-pass and aperiodic-pass filters, and the aperiodic-pass filter can be regarded as a generalized comb filter.…”

Section: Introductionmentioning

confidence: 99%

“…Lastly, the moving standard deviation (MSD) of the quasi-aperiodic force is computed and compared to a threshold for the detection. Moreover, for the PASF, we investigated a separation frequency that realizes a desired cutoff frequency for the firstorder PASF, the time constant of the first-order PASF on the basis of the previous studies [7,9], and highorder PASF based on [8]. They enable direct design of the cutoff frequency and time constant, and the high-order filter improves the harmonics elimination performance without deteriorating chatter signal extraction performance.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Harmonics Elimination by Periodic/Aperiodic Separation Filter for Chatter Detection

Muramatsu

Yamato

2023

Transactions of ISCIE

Self Cite

View full text Add to dashboard Cite

Process harmonics often need to be eliminated for accurate regenerative chatter diagnosis. To eliminate the harmonics with many band-stop characteristics, this paper uses a periodic/aperiodic separation filter (PASF) and proposes a chatter detection algorithm based on the PASF. The PASF can design the cutoff frequency and time constant, directly, and the high-order PASF improves the harmonics elimination performance without deteriorating chatter signal extraction performance. The experiments validated the proposed algorithm under several conditions of spindle speeds, cutting types, thresholds, and cutoff frequencies. Their results showed the robustness of the proposed chatter detection algorithm against the threshold selection and change of cutting conditions.

show abstract

Section: Design Of Cutoff Frequency Time Constant and Ordermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Harmonics Elimination by Periodic/Aperiodic Separation Filter for Chatter Detection

Muramatsu

Yamato

2023

Transactions of ISCIE

Self Cite

View full text Add to dashboard Cite

show abstract

“…The periodic/Aperiodic separation control was proposed to achieve quasi-periodic and quasi-aperiodic controls on a single-degree-of-freedom [17]- [19]. By using a periodic/aperiodic separation filter (PASF), a state is separated into quasi-periodic and quasi-aperiodic states, and the separated quasi-periodic and quasi-aperiodic tasks are simultaneously achieved.…”

Section: Introductionmentioning

confidence: 99%

Control of Prioritized and Separated Periodic/Aperiodic Task

Muramatsu

Hino

2023

IEEE Access

Self Cite

View full text Add to dashboard Cite

Robots are typically expected to perform multiple tasks. For realizing multiple tasks using multi-degrees-of-freedom of a robot, priority control was developed. The priority control prioritizes conflicting tasks by projecting lower-priority task velocity into a null space of higher-priority task spaces. Similarly, for realizing two tasks on a single-degree-of-freedom of a robot, periodic/aperiodic separation control was developed. The periodic/aperiodic separation control separates a state into quasi-periodic and quasiaperiodic states and feedback controls them separately. Thus, the priority control and periodic/aperiodic separation control realize multiple tasks in a different manner, and this paper proposes an integration of them to increase the number of simultaneously realized multiple tasks. Furthermore, this study analyzed the stability and conducted experiments to validate the proposed method. In the experiments, the proposed method achieved to increase the number of realizable tasks from six to nine by performing the quasi-periodic and quasi-aperiodic tasks in addition to prioritized tasks.

show abstract