• 제목/요약/키워드: Static Characteristics

검색결과 2,601건 처리시간 0.038초

경어뢰의 정특성 허용오차 산정 (An Evaluation of the Tolerance of the Static Characteristics for Light Weight Torpedoes)

  • 나영인
    • 한국군사과학기술학회지
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    • 제5권2호
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    • pp.149-158
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    • 2002
  • Static Characteristics of the system, such as weight, center of gravity etc., are inspected and regulated through the whole design process of a light weight torpedo system, and the nominal condition of the characteristics is prescribed for standardization of manufacturing and fabrication. It is possible that a real system or assembled system has different static characteristics from that of the nominal condition. It is required to evaluate the tolerance of the static characteristics within which the performance of the system should not be contaminated by the static characteristics. In this paper, an evaluation method of the tolerance is described for light weight torpedo systems. The method is to check on the performance and related critical parameters of light weight torpedoes. The checking items are composed of general conditions of underwater mobile systems such as stability and dynamic sensitivity and specified performance requirements for light weight torpedoes.

50,000rpm급 초고속 주축계의 정적/동적/열적 특성 해석 (Static/Dynamic/Thermal Characteristics Analysis of a High-Speed Spindle System with 50,000rpm)

  • 김석일;조재완;이원재;이용희
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 춘계학술대회 논문집
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    • pp.494-499
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    • 2003
  • This paper concerns the static, dynamic and thermal characteristics analysis of a high-speed spindle system for horizontal machining centers with 45mm x50,000rpm. The spindle system is designed based on the angular contact ceramic ball bearings, built-in motor, oil-air lubrication method and oil jacket cooling method. The structural and thermal analysis models of spindle system are constructed by the finite element method. The static and dynamic characteristics are estimated based on the static deformation, modal parameter, mode shape and frequency response function, and the thermal characteristics are estimated based on the temperature rise, temperature distribution and thermal deformation. The analysis results illustrate that the designed spindle system has excellent structural and thermal stabilities

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고압 스월분무 내부의 압력분포 및 유동특성에 대한 연구 (The Static Pressure Distribution and Flow Characteristics Inside the High-Pressure Swirl Spray)

  • 문석수;;최재준;배충식
    • 한국분무공학회지
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    • 제11권3호
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    • pp.168-175
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    • 2006
  • The static pressure distribution and flow characteristics inside the high-pressure swirl spray were investigated by measuring the static pressure inside the spray and applying the computational fluid dynamics (CFD). The static pressure difference between inner and outer part of spray was measured at different axial locations and operating conditions using a piezo-resislive pressure transducer. To obtain the qualitative value of swirl motion at different operating conditions, the spray impact-pressure at the nozzle exit was measured using a piezo-electric pressure transducer, and the flow angle was measured using a microscopic imaging system. The flow characteristics inside the high pressure swirl spray was simulated by the 1-phase 3-dimensional CFD model. The effect of pressure alternations on spray development was discussed with macroscopic spray images and a mathematical liquid film model. The results showed that the static pressure drop is observed inside the swirl spray as a result of the dragged air motion and the centrifugal force of the air. The recirculation vortex inside the spray was also observed inside the swirl spray as a result of the adverse pressure gradient along the axial locations. The results of analytical liquid film model and macroscopic spray images showed that the static pressure structure is one of the main parameters affecting the swirl spray development.

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MCFC 발전시스템 적용 촉매연소기의 혼합 특성 향상을 위한 Static Mixer의 유동에 관한 수치적 연구 (Numerical Investigation of the Flow and Mixing Characteristics with the Static Mixer in a Catalytic Combustor for the MCFC Power Plant System)

  • 김종민;박남섭;김만영
    • 대한기계학회논문집B
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    • 제33권3호
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    • pp.149-155
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    • 2009
  • In this work a numerical study to find the characteristics of the internal flow and mixing process has been conducted in a static mixer used in the system of catalytic combustor of the fuel cell power plant. After introducing the model description and final governing equations the present numerical approach is applied to the analysis of static mixer, which may have one or more helical elements inside the circular tube by changing such various parameters as incoming mass flow rates and the number of helical elements. The results show that although the static mixer is efficient in mixing fuel and air, more optimization processes are required to achieve the appropriate mixing characteristics in front of the honeycomb type catalytic combustor used in the MCFC power plant

이멀션유 정적믹서의 혼합특성 연구 (Mixing Characteristics of Static Mixers for Emulsion Oil)

  • 김기성;박상규
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2000년도 추계학술대회 논문집(Proceeding of the KOSME 2000 Autumn Annual Meeting)
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    • pp.91-98
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    • 2000
  • The fuels of water-in-oil emulsion have a potential of reducing PM(Particulate Matter) and NOx emissions, and increassing combustion efficiency in the furnaces and the burners. For making the most of the beneficial of the secondary atomization due to the microexplosion, the water droplets distributed in the oil must have the optimal sizes. The purpose of this paper is to investigate the water droplet size distribution characteristics of the different types of the static mixers. For analysing the size distribution characteristics efficiently, image analysis system was constructed and an appropriate image processing algorithm was developed. Two kinds of static mixers: Kenics type and RF type, were tested. As a results, RF type static mixer shows a better characteristics in the mean drop sizes, particularly in the condition of high water content.

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고무의 복합강성을 이용한 방진 마운트의 정적ㆍ동적 특성에 관한 연구 (The Study of Static and Dynamic Characteristics for a Isolation Rubber Mount using the Complex Stiffness)

  • 권오병;김종연;김영구;한문성;고철수
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 II
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    • pp.927-932
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    • 2001
  • Rubber has high damping and can be formed as various shape according to specific purpose. So, Rubber has widely used as isolation mounts. However, there are still a lot of difficulties in understanding of static and dynamic characteristics of compressed and shear rubber mounts. In this paper, Static characteristics of the rubber isolation mount are observed by the analytical method and FEM. Also dynamic characteristics of rubber mount under compression and shear strain are investigated.

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익스펜디드 금속을 내부 구조체로 가지는 ISB 판넬의 정적.동적 특성 분석 (Investigation into static and dynamic characteristics of ISB panels with the expanded metal as an internally structured material)

  • 안동규;이상훈;김민수;한길영;정창균;양동열
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.832-835
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    • 2005
  • The objective of this research work is to investigate into static and dynamic characteristics of ISB panels with the expanded metal as an internally structured material. In order to investigate static and dynamic characteristics of ISB panels, several experiments, the tensile test, three-point bending test and impact test, are carried out. From the results of the experiments, the mechanical properties, bending stiffness and impact absorption energy of the ISB panel have been obtained. In addition, it has been shown that the static and dynamic characteristics of ISB panel are highly dependent on the crimping angle of the pyramidal structure for the expanded metal.

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컴퓨터 하드 디스크 드라이브 스핀들 모터에 사용되는 곡면 유체 동압 베어링 해석 (Analysis of the Fluid Dynamic Bearings with Curve Surfaces in the Spindle Motor of a Computer Hard Disk Drive)

  • 김학운;장건희
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 추계학술대회논문집
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    • pp.401-406
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    • 2008
  • This paper proposes a method to calculate the static characteristics of the FDBs with the curved surface. The general Reynolds equations are derived for the curved surfaces in the ${\theta}s$ plane. And the Reynolds equation is transformed to the finite element equations by considering the continuity of pressure and flow at the interface between the curved, journal and the thrust bearings. It also includes the Reynolds boundary condition in the numerical analysis to simulate the cavitation phenomenon. The static characteristics of the coupled journal and conical bearings were investigated due to the variation of conical angle. It shows that the conical angle is one of the important design parameters affecting the static and dynamic characteristics of FBBs.

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질량유량제어기용 센서튜브의 정특성과 동특성에 관한 연구 (Dynamic and Static Characteristics of Sensor Tube for Mass Flow Controller)

  • 김영수;이상경
    • Journal of Advanced Marine Engineering and Technology
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    • 제28권3호
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    • pp.531-537
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    • 2004
  • In this paper, the static and dynamic characteristics in the sensor tube of a mass flow controller(MFC) were studied by experiments. In the sensor tube of MFC. the difference of temperature between inlet and outlet was necessary for calculating the mass flow rate. Therefore, the relations among flow rate, heat generated by heating wire. and sensor location were investigated to find optimized condition. Finally, the relation between sensor voltage through analog digital conversion(ADC) and flow rate in the sensor tube can be represented. Based on this study, static and dynamic characteristics of sensor tube can be used for design of mass flow controller.

정적 자세에 있어서의 산소 흡입량과 맥박에 관한 연구 (A Research on Oxygen Uptake and Heart Rate in Static Working Postures)

  • 임현교;박경수
    • 대한인간공학회지
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    • 제3권1호
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    • pp.19-24
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    • 1984
  • As in dynamic muscular activity, to support one's body may be regarded as the static workload. An examination is made of the relationship between heart rate and oxygen uptake of three male graduate students in static working postures (sitting, squatting and standing). Though it has been believed that there exists a linear relationship between heart rate and oxygen uptake, this thesis shows that both have no relationship in the case of static postures, and that they may depend upon the characteristics of postures rather than the static workload. These results are discussed analytically. The additivity between static body postures and holding up one's hands at his maximum height is tested. Compared with the sum of energy expenditure in balancing one's body and holding up hands, the net rate of energy expenditure in performing them simultaneously is equivalent. In the case of static postures, the importance of the awareness of the characteristics and relevance of the measures is discussed.

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