• Title/Summary/Keyword: Control Stick

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On the dynamics of hockey stick after contacting with the ball

  • Yue Jia
    • Advances in concrete construction
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    • v.15 no.4
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    • pp.287-301
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    • 2023
  • Hockey games attracts many fans around the world. This game requires a specific type of ball and a stick for controlling the motion and trace of the ball. This control of motion involves hitting the ball which is a direct intensive dynamic loading. The impact load transferred directly to the hand of the player and in the professional player may cause long term medical problems. Therefore, dynamic motion of the stick should be understood. In the current study, we analyze the dynamic motion of a hockey stick under impact loading from a hockey ball. In doing so, the stick geometry is simplified as a beam structure and quasi-2D relations of displacement is applied along with classical linear elasticity theory for isotropic materials. The governing equations and natural boundary condition are extracted using Hamilton's principle. The final equations in terms of displacement components are solved using Galerkin's numerical method. The results are presented using indentation and contact force values for variations of different parameters.

Measurement of fabric hand feeling by scanning fiber whisker with PSD

  • Cao, Li;Ohyama, Shinji;Kobayashi, Akira
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.1306-1309
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    • 1997
  • Fabric hand feeling is an important property used in apparel industry. This paper shows a sensing method to output a fiber whisker's stick slip vibration by scanning it on the fabric. Then the vibration waveforms are transformed to the Symmetrized Dot Pattern images. Experimental results show that SDP images of fiber whisker's stik slip is potentially useful to the detection of fabric hand feeling values.

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Design of Dielectric Detector for FRP Hot Stick in EHV Live line Maintenance

  • Chawporn, Talerngkiat;Sriratana, Witsarut;Trisuwannawat, Thanit
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.2063-2066
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    • 2005
  • This paper presents an approach to detect the dielectric condition of FRP Hot Stick in EHV high voltage cable whereas shutting down the power system is not necessary. The radio frequency generating method is adopted by transmitting radio wave into the Electrodes. This instrument is small, easy to use and also inexpensive. Furthermore, the impurity level of dirt on high voltage insulator (non-ceramic type) will be analyzed by using the methods based on IEEE Std.978-1984 at 105 kV.DC. /305 mm. and OSHA Regulation 1910.269 Part J - live line tools. The frequency at 10-20 MHz is applied to FRP Hot Stick via Electrode1 and from FRP Hot Stick surface to Electrode 2. After that the results will be evaluated by testing in each condition of FRP Hot Stick, such as dry surface, hot surface, foil winding and conductor inserting. Finally, the watt loss will be examined and compared with the loss from humidity and Carbon tracking. The important components of this system are radio frequency generating unit, frequency stabilizing unit, frequency amplifier, FRP Hot Stick frequency counter, processing unit, and display unit.

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A Study on the UI Design of Stick-type Intergrated Remote Controller for Domestic Use (가정용 스틱형 통합리모콘의 UI 디자인 연구)

  • Kang, Mi-Ryoung;Yoo, Yeon-Sik
    • Archives of design research
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    • v.20 no.3 s.71
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    • pp.235-246
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    • 2007
  • The study aims to design an integrated remote controller, which is an increasingly essential device in the home, for more convenient use. For this purpose, an alternative user interface (UI) design was developed by applying the user interface system of a popular existing product to an integrated remote control highly usable and easy to learn for domestic use, and the usability was evaluated. For the existing popular product, a cellular phone was selected, the operation method of which is similar to the stick-type integrated remote control for which the user interface design was to be developed in this research. Common characteristics of the UI of the selected cellular phone were derived and the characteristics were applied as much as possible to the design of a stick-type integrated remote control. The prototype of the alternative design, which was simulated with Flash, went through two pilot tests for further improvement before making the final experimental prototype. Based on the results, prototype buttons that improved the feeling of use in terms of physical operation and feedback were made, and the usability of the new UI design of a stick-type integrated remote control for domestic use were evaluated with 41 university students in their 20s. According to the results of the experiment, the newly designed stick-type integrated remote control based on the UI of an existing product may improve the usability of remote controls and the outcome of this study is expected to provide a good model for R&D of new UI designs of stick-type integrated remote controls for domestic use.

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Analysis of Customer Needs upon the Cockpit Layout of a Single Piston Aircraft (단발 피스톤 항공기의 조종석 형태에 대한 고객 요구도 분석)

  • Song, Byung-Heum;Lee, Sang-Chul;Sung, Hong-Gye;Moon, Hee-Jang;Shim, Sang-Hyun;An, Joon-Sung;Ko, You-Ri;Kim, Kwang-Hae
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.17 no.1
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    • pp.58-63
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    • 2009
  • The objective of this study is to analyze customer needs for the configuration of an aircraft cockpit layout of a single piston propeller aircraft. From the result of survey, we figure out the demand of the potential customers. We consider control stick and instrument out of several items to determine which pay for the aircraft or not. We analyze types and features of the aircraft control stick and the instrument which are equipped in the same aircraft in order to figure out what is best needed through a market survey and a questionnaire survey.

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Modeling of flexible stick balencer and controller design (Flexible stick balencer에 대한 modeling과 제어에 관한 연구)

  • Seo, Ki-Won;Cho, Hwang
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.233-236
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    • 1996
  • This paper describes a liner state-space model for a flexible stick balencer. The method employed to generate the model utilizes a separable formulation of assumed modes to represents the transverse displacement due to bending Lagrangian dynamics are applied to determine the kinetic and potential energies for the system. The resultant dynamic equations are then organized into a state space model and linearized using Taylor series expansion method. A minimum order observer is designed to estimate unmeasurable states.

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Stick-slip Friction Modeling and Performance Comparison of a Precise Linear Actuator (정밀 직선구동 액츄어에이터의 스틱슬립 마찰 모형화 및 성능특성 비교)

  • Kim, Sang-Chae;Kim, Soo-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.4
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    • pp.64-71
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    • 2001
  • In general, precise linear actuators using piezoelectric element are driven by friction force. Exact understanding of friction plays an important role in analysis and control of a motor. In this research, we designed a precise linear actuator using piezoelectric elements and observed its dynamic characteristics. By varying phase angle difference and amplitudes of the sinusoidal waves that are driving inputs, we can know that it is possible to control moving direction and distance of the slider. As preload is increased, its moving distance is decreased. And also, we have modeled a precise linear actuator using stick slip friction models such as classical, Karnopp. and reset integrator. Finally, by comparing the results of simulation and experiment, it was verified that the model is well designed.

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An Iterative Learning Control for the Precision Improvement of a CNC Machining center (CNC 머시닝센터의 정밀도 향상을 위한 반복학습제어)

  • 최종호;유경열;장태정
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.1
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    • pp.38-44
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    • 1995
  • We made a counter to measure the output of motor encoders for the motion error analysis of a CNC machining center, and have measured the dynamic characteristics and the position errors experimentally. Especially, we measured the radius errors for different feedrates and different radii when the CNC machining center performed a circular interpolation. We have also used an iterative learning method to reduce the radius errors and stick motion errors generated by the CNC machining center performing a circular interpolation. The results show that the proposed learning scheme can reduce the radius error and stick motion error significantly. The reduction of errors becomes more pronounced for higher feedrate and smaller radius.

The Precision Position Control of the Pneumatic Rodless Cylinder Using Recurrent Neural Networks (리커런트 신경회로망을 이용한 공압 로드레스 실린더의 정밀위치제어)

  • 노철하;김영식;김상희
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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    • pp.84-90
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    • 2003
  • This paper develops a control method that is composed of the proportional control algorithm and the learning algorithm based on the recurrent neural networks (RNN) for the position control of a pneumatic rodless cylinder. The proportional control algorithm is suggested for the modeled pneumatic system, which is obtained easily simplifying the system, and the RNN is suggested for the compensation of the modeling errors and uncertainties of the pneumatic system. In the proportional control, two zones are suggested in the phase plane. One is the transient zone for the smooth tracking and the other is the small movement zone for the accurate position control with eliminating the stick-slip phenomenon. The RNN is connected in parallel with the proportional control for the compensation of modeling errors and frictions, compressibilities, and parameter uncertainties in the pneumatic control system. This paper experimentally verifies the feasibility of the proposed control algorithm for such pneumatic systems.

Development of the Small-displacement-movement of a Pneumatic piston and the Hybrid Control Algorithm for Precision Position Control (정밀 위치제어를 위한 공압 피스톤의 미소변위 이송방법 및 혼합 제어 알고리즘 개발)

  • Roh, Chul-Ha;Kim, Yeung-Shik
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.7
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    • pp.40-45
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    • 2001
  • This paper proposes a methodology for the small-displacement-movement of a piston and develops a hybrid control algorithm for the precision position control of a pneumatic rodless cylinder. The pneumatic system uses the voltage-proportional solenoid valves to minimum valve switching since the on/off type valves are create diffculties for accurate position control and induce a lot of valve switching. For the accurate position control a methodology for the small-displacement-movement of the piston is developed and identified experimentally. The main consideration on the development of the hybrid control law is to eliminate a stick-slip phenomenon in the pneumatic control system. This paper addresses these critical issues and presents experimental results for the pneumatic control system.

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