• Title/Summary/Keyword: System Performance Improvement

Search Result 4,639, Processing Time 0.034 seconds

Improvement of Control Performance by Data Fusion of Sensors

  • Na, Seung-You;Shin, Dae-Jung
    • International Journal of Fuzzy Logic and Intelligent Systems
    • /
    • v.4 no.1
    • /
    • pp.63-69
    • /
    • 2004
  • In this paper, we propose a general framework for sensor data fusion applied to control systems. Since many kinds of disturbances are introduced to a control system, it is necessary to rely on multisensor data fusion to improve control performance in spite of the disturbances. Multisensor data fusion for a control system is considered a sequence of making decisions for a combination of sensor data to make a proper control input in uncertain conditions of disturbance effects on sensors. The proposed method is applied to a typical control system of a flexible link system in which reduction of oscillation is obtained using a photo sensor at the tip of the link. But the control performance depends heavily on the environmental light conditions. To overcome the light disturbance difficulties, an accelerometer is used in addition to the existing photo sensor. Improvement of control performance is possible by utilizing multisensor data fusion for various output responses to show the feasibility of the proposed method in this paper.

A Study on Performance Improvement of Multi-stage Pump Applying CFD Analysis Technique (CFD해석기법을 적용한 다단펌프 성능향상에 관한 연구)

  • Kim, Sang-Yu;Kim, Jae-Yeol;GAO, JIACHEN
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.21 no.3
    • /
    • pp.70-76
    • /
    • 2022
  • Recently, the demand for ultra-precision processing has increased owing to the increase in the demand for high-performance ultra-precision optical parts in the fields of information technology (IT), bio, healthcare, aerospace, and future automobiles. In this study, a performance improvement of a multi-stage pump was achieved by improving the pump casing structure rather than using the existing performance improvement method. To verify the performance improvement, the CFD analysis reliability of the existing pump, Pump A, was verified using the FLUENT app in the analysis software ANSYS, and the pump casing was improved through the verified CFD analysis of Pump B. Therefore, we want to analyze the performance improvement.

Performance Analysis and Optimum Design Method of Positive Displacement Turbine for Small Hydropower (소수력발전용 용적형수차의 성능해석과 최적설계법에 관한 연구)

  • Choi, Young-Do
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.31 no.5
    • /
    • pp.514-521
    • /
    • 2007
  • There has been considerable interest recently in the topic of renewable energy. This is primarily due to concerns about environmental impacts. Moreover, fluctuating and rising oil prices, increases in demand, supply uncertainties and other factors have led to increased calls for alternative energy sources. Small hydropower, especially using water supply system, attracts high attentions because of relatively lower cost and smaller space requirements to construct the plant. Moreover. newly developed positive displacement turbine has high acceptability for the system. Therefore, the purpose of this study is focused on the examination of the performance characteristics and proposition of a optimum design method of the turbine for the improvement of the performance. The results show that newly proposed optimum design method for the turbine has high accuracy of performance prediction and good applicability for the performance improvement of the turbine.

W-function for the Improvement of the Network in Manufacturing Process (제조공정 Network의 개선을 위한 W-함수)

  • 이상도;박기주
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.12 no.20
    • /
    • pp.71-76
    • /
    • 1989
  • In this paper, GERT network in modeled to improve the network of manufacturing process with feedback loop. A lot of Information on the GERT network can be derived from the equivalent W-function and MGF(moment generating function) using Mason's rule. These equations are used in calculating the variations of the performance measure and in improving the system performance. System improvement in manufacturing process is achieved by increasing the equivalent probabilities of each branches and by decreasing the expected equivalent time.

  • PDF

A Study on the Knowledge Based Control Algorithm for Performance Improvement of the Automotive Suspension System (현가장치의 성능향상을 위한 지능형 제어로직에 관한 연구)

  • So, S.G.;Byun, G.S.
    • Journal of Power System Engineering
    • /
    • v.5 no.2
    • /
    • pp.87-92
    • /
    • 2001
  • Automotive suspension system is a mechanism for isolation of the vibration coming from the road inputs. Recently, the electronically controlled suspension systems which may improve ride and handling performance have been developed. Here, the continuously controlled semi-active suspension system is focused. As a mechanism to control damping forces continuously, a solenoid valve is used. The modeling for the solenoid valve is introduced briefly, a vehicle dynamics modeling is constructed, and then combined system model is completed. To design the efficient control algorithm for the semiactive suspension system the knowledge based fuzzy logic is applied and the technique how to apply the sky-hook theory to the fuzzy logic is developed. Finally, to confirm the improvement of performance the computer simulation is carried out.

  • PDF

A Study on the Performance Improvement of an Air Spring System (에어스프링 시스템의 성능 개선에 관한 연구)

  • Jang, J.S.
    • Journal of Drive and Control
    • /
    • v.10 no.2
    • /
    • pp.1-6
    • /
    • 2013
  • This study describes a method which can attenuate reaction force effectively for an air spring system composed of an air spring and auxiliary chamber. For the analysis, the nonlinear governing equation of the air spring system is derived. For a performance improvement of the system, change of the heat transfer effect and the mass flow rates is included in the analysis of the air spring system. The simulation study is presented to show the reaction force is changed by variations in heat transfer characteristics and the air spring system of isothermal process has the best performance. As a result, to improve attenuation characteristics of reaction force, a process in the air spring system should be maintained near isothermal process.

Improvement of Welding Performance of Flash bull Welder by on Inverter Controlled Technology (인버터 제어방식을 이용한 Flash butt 용접기의 용접성능 향상)

  • 이왕하;박상국;이성희
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.17 no.1
    • /
    • pp.45-53
    • /
    • 2003
  • For the improvement of welding performance, high-efficiency inverter system was designed and applied that system to the conventional large scale Flashbutt welder. The inverter systems are consists of full bridge PWM power control system and DSP controller. This inverter system has increased switching frequency of power control system of Flashbutt welder. For the test of application effects, we compared an our inverter control system with a conventional thyristor control system. In the results, we confirmed that our system has decreased the welding spatter amouts and improved welding performance.

Detection Performance Improvement by Limit&STC Assembly Betterment of Surveillance Radar (천마 탐지레이더 Limit&STC 조립체 개선을 통한 탐지성능 향상)

  • Yoon, Jaebok;Kim, Siok;Keum, Jongju
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.19 no.1
    • /
    • pp.1-8
    • /
    • 2016
  • In this paper, we have described the performance improvement of surveillance radar to prevent damage or malfunction of surveillance radar RF head unit due to the strong reflections caused by artificial obstacles at close range. We have proposed a technique to improve the performance of the RF head unit as a solution to overcome the limitations of the operating system and improve radar performance. We have verified the effectiveness of the improvement by comparing the before and after results applied to actual system.

Application of Quality Cost Model ln Quality Improvement Area (품질개선분야에서의 품질코스트모델의 적용)

  • Chung, Young-Bae;Kim, Yon-Soo
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.34 no.3
    • /
    • pp.71-78
    • /
    • 2011
  • This parer proposes application of quality costing system in quality improvement area. Cost of quality in quality improvement area provides a valuable of both providing the need for improvement and giving a starting point for project. WQCMS(Web-based Q-Cost Management System) have ability to collect and analyze quality data generated from various different departments in the inside or outside of the enterprise without any limitations, if end-users are able to access wide area network. It provides the capability to integrate quality information from database and to generate various easy analysis reports to management's needs using built-in analysis tool modules with real-time. Web-based quality cost management system to measure the performance of quality improvement activities in the business firms. This paper proposes standard model for quality cost process in quality improvement area.

Performance Improvement of Air Conditioner Network System using Wireless Sensors Through System Performance Index and Dynamic Power Distribution Control (시스템 성능 지수 및 동적 전력분산 제어를 통한 무선센서를 이용한 에어컨 네트워크 시스템의 성능 개선)

  • Choi, Ho-seek;Kwon, Woo-hyen;Yoon, Byung-keun
    • Journal of Sensor Science and Technology
    • /
    • v.28 no.1
    • /
    • pp.64-70
    • /
    • 2019
  • Wireless sensors have been developed in numerous ways for enhancing the convenience of installation, management and maintenance of sensors. Energy harvesting wireless sensors, which can collect energy from the external environment for permanent usage without the need of recharging and exchanging batteries, have been developed and employed used in Internet of Things and at various industrial sites. Energy harvesting wireless sensors are significantly affected by the sensor lifespan to sudden variation in the external environment. Furthermore, reduction in the sensor operating timespan can greatly affect the characteristics of the devices connected through a network. In this paper, a system performance index is proposed that can comprehensively evaluate the lifespan of a solar cell wireless sensor, determine the characteristics of devices connected to the associated network, and recommend dynamic power distribution control for improving the system performance index. Improvement in the system performance index was verified by applying the proposed dynamic power distribution control to an air conditioner network system using a solar cell wireless sensor. Obtained results corroborate that the dynamic power distribution control can extend the lifespan of the incorporated wireless sensor and reduce the air conditioner's power consumption.