When designing helical gears, the goal is to optimize gear weight, efficiency, and noise while simultaneously achieving required strength. In this study, macro geometry of a pair was optimized for low high noise; further, trends optimal solutions five combinations three objectives were analyzed. The mass efficiency directly used as design objectives. However, since calculation generally very complicated time-consuming, has not been objective, peak-to-peak static transmission error (PPSTE),...

Abstract Wind turbines are eco-friendly energy sources that generate electricity from wind power. Among their various components, gearboxes constitute the most critical loss owing to longest downtime. To guarantee durability, a flexible pin was designed based on original straddle-mounted for enhanced tooth load sharing and distribution in planetary gear set (PGS) of turbine gearbox (WTGB). The improved durability evaluated by calculating mesh factor face contact stress comparing these values...

This article presents an integrated engine-hydro-mechanical transmission control algorithm for a tractor considering the efficiency. First, hydro-mechanical efficiency was obtained by network analysis based on hydrostatic unit constructed from test. Using map and thermal of engine, optimal operating line obtained, which provides higher total system Based line, proposed, powertrain To evaluate performance proposed algorithm, AMESim-MATLAB/Simulink-based co-simulator developed. From simulation...

Recent carbon neutrality policies have led to active research in the agricultural tractor sector replace internal combustion engines, making it imperative minimize power losses improve efficiency. Dual-clutch transmissions (DCTs) been employed tractors primarily due their short shift time and smooth feel. However, DCTs a relatively large number of components complex structures owing spatial constraints, challenging predict losses. Therefore, DCT losses, this study defined oil churning by...

In this study, crank-locker kinematic equations were used to analyze the three-point hitch behavior when dynamometer was connected work machine. The statically tested with a hydraulic actuator, and accuracy of three-way force moment confirmed be 96–99%. calibrated put test on real farm field, data collected using acquisition system. Using transport pitch correction equation, can transformed into more realistic data. International standards determine point connection between tractor,...

In gear design, performance metrics such as safety factors for tooth root stress and surface durability, peak-to-peak static transmission error (PPSTE), efficiency, mass, volume are considered. They calculated by the geometric parameters of macro- micro-geometry, manufacturing errors related to geometry significantly affect performance. However, previous studies have only focused on micro-geometry errors. this study, Monte Carlo-type robustness analysis was performed considering thickness,...

Loaded tooth contact analysis (LTCA) adopted to obtain the static transmission error for gear optimization affects significantly computation time and results. This paper is study an efficient process of macro geometry helical pairs with LTCA. An analytical LTCA model was proposed verified measured error. To find method, divided into three types (based on whether slice stiffness extended were included) by adjusting fidelity. When included in LTCA, increased very short, but accuracy results...

Finite element analysis is widely used to predict the structural stability and tooth contact performance of gears. This study focused on effect finite modeling conditions a spur gear simulation result model simplification. The body teeth, teeth width, configuration mesh, frictional coefficient, time interval (gear mesh cycle division) were selected for simplification analysis. static transmission error during single-gear was calculated represent gear, elapsed measured as factor. Contact...

In this study, a multi-objective optimal design of planetary gear set was performed considering mass, power loss, and transmission error. particular, the results were analyzed from novel perspective. The implemented methodology minimizes vibration with respect to seven macro-geometry variables. peak-to-peak static error (PPSTE) each pair corresponds excitation source set, reducing PPSTE helps minimize vibration. Thus, calculated using time-varying mesh stiffness obtained through an...

서천 ë´‰ì„ ë¦¬ ìœ ì ì—ì„œ ì¶œí† ëœ ëª©ê³½ê³ ì˜ œìž‘ 연대는 í† ì¸µ 및 축부의 축조방법으로 5세기 „후로 ì¶”ì •ë˜ì—ˆ 다. •í™•í•œ 연대를 í™•ì¸í•˜ê³ ìž 목곽부재 3ì ì— 대해 위글매치를 이용한 방사성탄소연대분석을 실시하였다. 1(BSMG 01)의 최외각 연륜은 95.4% ì‹ ë¢°êµ¬ê°„ì—ì„œ AD 431~551ë „, 2(BSMG 06)는 460~570ë „ìœ¼ë¡œ 확인 ë˜ì—ˆê³ 3(BSMG 12)은 240~430ë „ 또는 490~510ë 산출되었다. 목부재 ì˜ 공통 ê³ í•™ì ìœ¼ë¡œ...