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EtherCAT 네트워크 기반 리눅스 RTAI 개방형 CNC 시스템 구현
박성문,안철진,김형우,이현철,최준영,Park, Sung-Mun,An, Cheol-Jin,Kim, Hyoungwoo,Yi, Hyun-Chul,Choi, Joon-Young 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.10
We propose a method for the implementation of an EtherCAT communication bus in a Linux-based open source Computerized Numerical Control (CNC) system. Recently, increasingly more CNC systems support real-time Ethernet protocols such as EtherCAT, which is a high-performance industrial communication protocol. For real-time CNC control over an Ethernet-based protocol, an additional layer driver needs to be implemented between the CNC system and the master of industrial communication protocol. Among the various solutions for the connection layer driver, we employ a Hardware Abstraction Layer (HAL) driver based on Linux. The operation of the implemented CNC system is demonstrated and confirmed by Hal Meter, which is used to observe the pins, signals, or parameters of HAL.
가중평균 볼테라 커널을 이용한 아날로그-디지털 변환기의 블라인드 비선형 등화기 설계
박성문(Sung-Mun Park),안철진(Cheol-Jin An),김형우(Hyoung-Woo Kim),서원기(Won-Gi Seo),최준영(Joon-Young Choi) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.9
We propose a new method to design a blind nonlinear equalizer to improve the performance of ADC(Analog-to-Digital Converter) by using a weighted averaged Volterra kernels. We employ the structure of the existing blind equalizer using Volterra series for the basic structure of the designed equalizer. While the Volterra kernels are determined from output signals driven by Gaussian input signals in the existing methods, the Volterra kernels are determined by weightedly averaging a set of Volterra kernels obtained from several single-tone input signals. Consequently, the proposed method enables to design an equalizer without additional experiments for Gaussian signals when ADC’s outputs are available for several single-tone input signals. Applying the designed equalizer to a real ADC model and conducting experiments, we confirm that the equalizer adequately compensates the nonlinearity of ADC. Moreover, comparing the experiment results to those from an existing blind equalizer, we verify that the designed equalizer achieves a similar performance to the existing equalizer.
박성문(Sung-Mun Park),김진순(Jin-Sun Kim),최준영(Joon-Young Choi) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 공작기계 이송시스템을 위한 공진 주파수 측정 및 억제 방법을 제안한다. 공작기계 이송시스템은 Maltlab-Simulink를 이용하여 모델링 한다. 실제 시스템과 같이 위치 및 속도, 전류 제어기의 제어주기를 다르게 하여 다중 주기로 동작할 수 있도록 하고, Matlab-Simscape를 이용하여 이송 시스템의 기계적인 부분을 실제 시스템과 유사하게 구현한다. 공진 주파수 측정을 위해 속도 제어기의 출력에 대수적 스윕 사인 외란을 입력하고 속도 제어기 출력을 측정하여 공진 주파수를 측정하고, 노치필터를 이용하여 공진 주파수 성분을 제거하여 공진을 억제한다. 제안한 방법을 Matlab-Simulink에서 구현하고 모의실험을 수행하여 공진 주파수를 측정하고 억제하는 것을 검증한다.
EtherCAT 네트워크 기반 리눅스 RTAI 개방형 CNC 시스템 구현
박성문(Sung-Mun Park),안철진(Cheol-Jin An),김형우(Hyoungwoo Kim),이현철(Hyun-Chul Yi),최준영(Joon-Young Choi) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.18 No.12
We propose a method for the implementation of an EtherCAT communication bus in a Linux-based open source Computerized Numerical Control (CNC) system. Recently, increasingly more CNC systems support real-time Ethernet protocols such as EtherCAT, which is a high-performance industrial communication protocol. For real-time CNC control over an Ethernet-based protocol, an additional layer driver needs to be implemented between the CNC system and the master of industrial communication protocol. Among the various solutions for the connection layer driver, we employ a Hardware Abstraction Layer (HAL) driver based on Linux. The operation of the implemented CNC system is demonstrated and confirmed by Hal Meter, which is used to observe the pins, signals, or parameters of HAL.
LoRaWAN 엔드 노드 장치를 위한 임베디드 플랫폼 개발
박성문(Sung-Mun Park),최준영(Joon-Young Choi) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.10
In this paper, we design and implement an embedded platform for end node devices supporting LoRaWAN protocol. Based on commercial LoRaWAN module including MPU and RF transceiver, an embedded circuit is designed and implemented, and an application development environment based on operating systems is built. In order to realize the low power characteristics of the end node, the battery capacity detection circuit and the power supply control circuit of each device are designed and applied, and the application program is written using the power saving mode provided by the operating system. We build a LoRaWAN test environment consisting of a commercial gateway, a web browser-based network server, and five developed end nodes, and perform the experiment in which five end nodes transmit data simultaneously every 10 seconds. As test results, five end nodes transmit data normally for more than 14 hours, which verifies the normal operation and performance of the developed end node.
공작기계 이송시스템의 기계 공진 억제를 위한 공진 주파수 측정
박성문(Sung-Mun Park),김진순(Jin-Sun Kim),최준영(Joon-Young Choi) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.1
In this paper, we implement a method for measuring resonance frequency to suppress mechanical resonance based on a notch filter in a machine tool feed drive system. The machine tool feed drive system model is developed using Matlab-Simulink to conduct simulation in an environment similar to the actual feed drive system. In order to measure the resonance frequency for designing a notch filter which is usually used as a resonance suppression method, a swept sinusoidal signal input is applied to a speed controller, and a frequency response is analyzed. Based on the implemented feed drive system model and resonance frequency measurement method, a simulation is conducted to measure the resonance frequency and suppress mechanical resonance by designing the notch filter. The simulation results verify that the measured resonance frequency is highly close to the actual one measured by an acceleration sensor and the mechanical resonance is significantly suppressed by applying the designed notch filter.