• 제목/요약/키워드: Gear system

검색결과 1,172건 처리시간 0.03초

탄소저감형 트롤어구 개발의 경제성 분석 (Economic analysis of development of low-carbon trawl gear)

  • 박성욱;이경훈;강민주;박성쾌
    • 수산해양기술연구
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    • 제48권4호
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    • pp.360-369
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    • 2012
  • The main purpose of this study is to analyse economic feasibility of low-carbon-oriented trawl gear. The results of benefit/cost analysis showed that use of the low-carbon fishing gear is economically feasible. Considering the fuel saving and relatively low $CO_2$ emission by reducing the resistance of gear, net present value by such gear improvement was estimated about 2,430~2,853 million won with the benefit-cost ratio 1.65~1.84 and the internal rate of return 29.18~30.48 percent. Development of low-carbon trawl gear would render significant contributions to reducing $CO_2$ emission in fishing operations and lead to reduce fishing costs due to fuel savings.

주기적 물림강성 변화와 백래쉬에 의한 기어구동계의 비선형 동특성 (Nonlinear Dynamic Characteristics of Gear Driving Systems with Periodic Meshing Stiffness Variation and Backlash)

  • 조윤수;최연선
    • 한국소음진동공학회논문집
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    • 제12권12호
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    • pp.921-928
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    • 2002
  • Main sources of the nitration of a gear-pair system are backlash and transmission error, the difference between required and actual rotation during gear meshing. This paper presents the nonlinear dynamic characteristics of gear motions due to the existence of backlash and periodic variation of meshing stiffness, which is assumed as a one-term harmonic component. Gear motions are classified as three types with the consideration of backlash. Each response is calculated using the harmonic balance method and confirmed by numerical integration. The responses with the increase of the rotating speed show abrupt changes in its magnitude for the variation of the preload, exciting force, and damping coefficient. The result also shows that there is a chaotic motion with some specific design parameters and operating conditions In gear diving system. Consequently the design of gear driving system with low nitration and noise requires the study on the effects of nonlinear dynamic characteristics due to stiffness variation and backlash.

원통 기어로 구성된 다단 기어열의 기어비 분할법 개발 (New Methods to Split Overall Gear Ratio of the Cylindrical Multi-Stage Gear Train)

  • 배인호;정태형
    • 한국공작기계학회논문집
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    • 제11권6호
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    • pp.45-51
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    • 2002
  • The existing methods to split overall gear ratio of the cylindrical multi-stage gear train have their own limitations to be used in practical design and are also problematic to be implemented in a formalized algerian. This paper proposes two types of new methods to find gear ratios best approximating the overall gear ratio. The proposed methods are quite general to be applied to the gear train having any number of stages, and offer a considerably good result in a very short time. The first method uses the random search method and the second one is based on the simulated annealing algorithm. The proposed algorithms are expected to be very useful not only as an independent program to split overall gear ratio, but also as a desist sub-module for the integrated desist system of multi-stage gear drives.

기어 소음 품질 안정화를 위한 전달오차 측정 시스템 개발 및 전달오차 스펙 개발에 대한 연구 (A Research for the Development of the Transmission Error Measuring System and Transmission Error Specification for the Gear Noise Quality)

  • 이상화;이현구;강석찬;김시웅;유동규;원광민;채금묵;이태휘
    • 한국소음진동공학회논문집
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    • 제24권6호
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    • pp.470-475
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    • 2014
  • In the past, transmission error(T.E.) has been identified as one of the main sources of gear whine noise, which cause serious passengers irritation at high frequency. In this study, to identify the correlation of the T.E. and gear whine noise, a T.E. measuring system was developed. By comparing the T.E. and gear whine noise level, T.E. target value which can represent the gear noise was proposed. The conclusions are followed: (I) It is possible to measure T.E. of the gear pairs (II) Similar trends are observed between T.E. and gear whine noise. (III) By observing the T.E. pattern, presence of sideband noise can be predicted. (IV) Proposed T.E. target value can be adopted to the gear manufacturing for gear noise quality management.

1.7톤급 소형 굴착기용 주행 감속기의 복합 유성기어류에 대한 강도 평가 (Strength Evaluation of Complex Planetary Gear Train of Traveling Reducer for 1.7-Ton Grade Small Excavator)

  • 남석주;배명호;조연상
    • Tribology and Lubricants
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    • 제38권1호
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    • pp.22-26
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    • 2022
  • A 1.7-ton grade small excavator is a construction equipment that can perform various functions in limited spaces where heavy equipment cannot enter easily. Owing to the recent acceleration of urbanization, it has been used increasingly in drainage and gas pipes, as well as for road repair works in urban areas. The power train of a traveling reducer for a 1.7-ton grade small excavator utilizes a complex planetary gear system. Complex planetary gears are vital to the power train of a traveling reducer as it mitigates the fatigue strength problem. In the present study, the specifications of a complex planetary gear train are calculated; furthermore, the gear bending and compressive stresses of the complex planetary gears are analyzed to achieve an optimal design of the latter in terms of cost and reliability. In this study, the actual gear bending and compressive stresses of a planetary gear system are analyzed using a self-developed gear design program based on the Lewes and Hertz equation. Subsequently, the calculated specifications of the complex planetary gears are verified by evaluating the results with the data of allowable bending and compressive stress based on curves of stress vs. number of cycles of the gears.

굴삭기용 선회감속기의 베어링 특성이 기어 하중 분포에 미치는 영향 분석 (Effects of Bearing Characteristic on the Gear Load Distribution in the Slewing Reducer for Excavator)

  • 김정길;박영준;이근호;김재훈
    • 한국기계가공학회지
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    • 제13권5호
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    • pp.8-14
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    • 2014
  • A slewing reducer consists of two planetary gearsets which require a good load distribution over the gear tooth flank for enhanced durability. This work investigates how the bearing characteristics influence the load distribution over the gear tooth flank. A complete system model is developed to analyze a slewing reducer, including the non-linear mesh stiffness of the gears and the non-linear stiffness of bearings. The results indicate that the type, arrangement and preload of the output shaft bearings greatly influence the gear mesh misalignment, contact pattern, face load factor, gear safety factor and lifetimes of the parts.

스퍼 기어 시스템의 음향 신호와 비 유막 두께(Specific Film Thickness)의 상관관계에 관한 실험적 연구 (Experimental Investigation to Establish Correlation between Specific Film Thickness and Sound Signals in a Spur Gear System)

  • 김종식;;이상권
    • 한국소음진동공학회논문집
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    • 제24권8호
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    • pp.643-650
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    • 2014
  • Gear transmission system is widely applied in engineering. As the problem of contact fatigue, wear, lubrication failure etc, the condition of gear teeth contacts will be worse. The vibration and sound signals in the gear system will be affected by the some failures like scuffing, abrasive wear and spalling due to the deterioration of gear teeth surface. By studying the estimation of specific film thickness, measurement of reduction in tooth thickness, visual examination of wear mechanisms on the gear teeth and their effects on the statistical parameters of vibration and sound signals, the research obtained the satisfactory results on accessing the surface fatigue wear in a spur gear system. The paper utilizes the relationship between statistical parameters obtained from sound signals and Stribeck curve to confirm the hypothesis of dependency of surface fatigue wear, specific film thickness.

치차장치 설계를 위한 설계지원 시스템 개발에 관한 연구 (development of design support system for gear drives)

  • 정태형;배인호;김현
    • 대한기계학회논문집A
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    • 제21권9호
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    • pp.1373-1384
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    • 1997
  • There have been a number of expert systems which are concerned with the design of machine elements such as gear, shaft, bearing and so on. However the design of more complicated systems such as gear dreives are still difficult. Thus, in consideration of the integrative nature of the system, we develop a design support system for gear drives which is composed of various machine elements-gear, shaft, bearing, key and so on. Design systems for each machine element are developed and integrated through object-oriented approach. Databases essential for data reference and/or data control in the design process are built up independently and interface to the main program. Expert systems are also developed and integrated for intelligent support to the designer, in those of the determination of gear specification and the selection of bearing types. Through the integration of design environment for each machine element, it is expected to increase the convenience in the design process and the stability of the design solution. And also the system management, including addition of various design/analysis modules and expansion to the gear drives of other types, can be conveniently achieved since the system has developed under due consideration of its efficiency and expandability through object-oriented programming approach.

기어 축의 기어 및 이 끝 위치 판별을 위한 유도형 센서시스템의 개발에 관한 연구 (A Study on Development of Inductive Sensor System for Locating Geared Part and Gear Position in Geared Shaft)

  • 오석규;배강열
    • 한국정밀공학회지
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    • 제31권3호
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    • pp.223-232
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    • 2014
  • An inductive sensor system is proposed to detect the gear location and angular position of a geared shaft for automatic feeding of the shaft into the proper cutting position of the other end. The system consists of two set of coils, bridge circuit, signal condition circuit, and microprocessor. The coil sensors of the system measure changes of inductance along with the surface position of a geared shaft. The inductance changes are transformed to voltages by the bridge circuit, which are then conditioned and processed for the recognition of the gear. In order to incorporate with the experimental results with the sensor system, a finite element method (FEM) simulation for the magnetic field between the sensor and the shaft was carried out. The predicted results and the experiments revealed that the sensor system was appropriate for sensing the position of gear and the angular position of gear tooth of a geared shaft.

기어 백래쉬로 인한 응답지연 및 추종오차 억제방안에 관한 연구 (A Study on Response Time Delay and Tracking Error Suppression Strategy in Gear Mechanism : Control System Design Approach)

  • 만손트란;최은호;김영복
    • 동력기계공학회지
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    • 제21권4호
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    • pp.77-83
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    • 2017
  • The aim of this paper is to solve the chattering and delayed response problems caused by gear backlash. In the gear mechanism based systems, for example, in robot systems, the actuators provide the reduction gear with motors to transfer effectively electric power to mechanical power. Therefore, the gear backlash exists and is an unavoidable fact which makes many undesirable problems. In this paper, the authors try to make a solution for this issue and, introduce several control methods which are PID only, PID with Smith predictor and super-twisting algorithm based SMC(sliding mode control). Each control method is applied to the real plant in which strong backlash is included. By comparison results, it is clear that SMC gives the best control performance with little backlash effects. Also, the usefulness and effectiveness of proposed control method is verified by experiment.