【标题】VISUALISATION APPROACH FOR PREDICTION AND ANALYSIS OF EFFICIENCY OF AN OIL PUMP BASED ON GEOMETRICAL ARRANGEMENT
【参考中译】基于几何布置的石油生产效率预测和分析的可视化方法
【类型】 期刊
【关键词】 Oil pump; Visualisation; Motion analysis; Numerical simulation
【参考中译】 油泵;可视化;运动分析;数值模拟
【作者】 Koji Makino; Hidetsugu Terada
【摘要】 Predicting the efficiency of an oil pump before the main design stages is desirable. The tooth profile can be designed using not only theoretical approaches but also the experience and implicit knowledge of the skilled engineer. Many design factors must be considered, such as the torque efficiency, volumetric efficiency and oil leakage from the seal area. However, the factors are intricately related with each other, which makes improving the design difficult. This paper proposes a visualisation approach that uses numerical simulations to analyse the motion of a trochoid oil pump and predict its efficiency based on the geometry of the gaps between the teeth of its rotors. In the visualisation approach, the rotation and shifted motion of the rotors are considered to simulate the real pump as accurately as possible. The proposed visualisation approach was applied in numerical simulations to predict the efficiency of four rotor combinations. Experiments were performed using a real pump with the same rotor combinations as in the simulations to evaluate the prediction accuracy. The results showed that the proposed approach could be used to approximately predict and analyse some of the features of the oil pump.
【参考中译】 在主要设计阶段之前预测油泵的效率是可取的。设计齿形不仅可以使用理论方法，还可以使用熟练工程师的经验和隐性知识。必须考虑许多设计因素，如扭矩效率、体积效率和密封区漏油。然而，这些因素相互错综复杂地联系在一起，这使得改进设计变得困难。本文提出了一种可视化方法，该方法利用数值模拟来分析摆线油泵的运动，并根据其转子齿间间隙的几何形状来预测其效率。在可视化方法中，考虑了转子的旋转和变速运动，以尽可能准确地模拟真实的泵。将所提出的可视化方法应用于数值仿真，预测了四种转子组合的效率。为了评估预测的准确性，使用了与模拟相同的转子组合的真实泵进行了实验。结果表明，该方法可以对油泵的某些特性进行近似预测和分析。
【来源】 International Journal of Mechanics and Control 2023, vol.24, no.1
【入库时间】 2024/11/20
【标题】NUMERICAL AND EXPERIMENTAL STUDY OF THE PRESSURE-COMPENSATED FLOW CONTROL VALVE IN AN HYDRAULIC SYSTEM USING, MATHEMATICAL MODEL AND LAB VIEW
【参考中译】利用数学模型和实验视图进行液压系统中压力补偿流量控制系统的数值和实验研究
【关键词】 Flow control valve; Mathematic model; Computer simulation; Fluid power; Lab view
【参考中译】 流量控制阀;数学模型;计算机模拟;流体动力;实验室视图
【作者】 Spartak Pocari; Majlinda Alcani; Parid Alimhillaj; Andonaq Londo; Artan Hoxha
【摘要】 In hydraulic systems, the flow control valve is mainly used to regulate the speed of the output node of the hydraulic motor by changing the passage space of the fluid in the valve. However, the inlet and outlet pressures of the valve do not always remain constant. Any change in pressure will change the flow rate of the fluid passing through the valve and therefore will change the speed of the hydraulic motor. Pressure compensated flow control valves are often used in hydraulic systems when precise speed control is required under varying pressures due to load variation. Since for all industrial processes where hydraulic power plants are used, the presence of a stable state of the working characteristic of the hydraulic motor is necessary, we studied the pressure-compensated flow regulating valve with the aim of building a mathematical model and after a simulation program, through which will simulate the working characteristics of the valve and by combining experimental data we can improve the characteristic of this component by changing its constructive elements.
【参考中译】 在液压系统中，流量控制阀主要用于通过改变阀内流体的流道空间来调节液压马达输出节点的速度。然而，阀门的入口和出口压力并不总是恒定的。压力的任何变化都会改变流过阀门的流体的流量，从而改变液压马达的速度。压力补偿流量控制阀通常用于液压系统中，当由于负载变化而需要在不同压力下进行精确的速度控制时。由于在所有使用水力发电装置的工业过程中，液压马达的工作特性都需要有一个稳定的状态，所以我们对压力补偿式流量调节阀进行了研究，目的是建立数学模型，并编制仿真程序，通过仿真来模拟该阀的工作特性，并结合实验数据，通过改变其结构元件来改善该元件的特性。
【来源】 International Journal of Mechanics and Control 2024, vol.25, no.1
【标题】Development of an Autonomous Blower Robot for Cleaning up and Collecting Fallen Leaves
【参考中译】用于清理和收集落叶的自主鼓风机机器人的开发
【类型】 会议
【作者】 Nakagawa Natsu; Date Hisashi
【摘要】 The use of household cleaning robots has become increasingly popular, but automation of cleaning up fallen leaves using a blower has not been studied. In this study, we develop an autonomous mobile robot that performs cleaning up leaves with a blower mounted on the robot. We adopt a three-wheel active caster as a moving mechanism: Both the drive and steering axes of each wheel are driven by motors, enabling omnidirectional motion. The blower is fixed to the robot with a slight downward tilt. We evaluated the quantity of leaves cleaned up from a large area varying the speed of movement. We found that the faster the robot moved, the fewer leaves were cleaned up, but at least 98% at the highest speed. We also evaluated the robot's ability to collect leaves using a wall as a guide. As a result, about half of the leaves were missed because the blower was not targeted at the landing place of the flown-up leaves. It turned out that we need to study the three-dimensional behavior of the jet stream for future work.
【参考中译】 家用清洁机器人的使用已经变得越来越流行，但使用吹风机清理落叶的自动化还没有被研究过。在这项研究中，我们开发了一个自主移动机器人，在机器人上安装一个鼓风机来执行清理树叶的任务。我们采用三轮主动脚轮作为移动机构：每个车轮的驱动轴和转向轴都由电机驱动，实现全方位运动。鼓风机略微向下倾斜固定在机器人上。我们评估了从不同移动速度的大片区域清理的树叶的数量。我们发现，机器人移动得越快，清理的树叶就越少，但在最高速度下，至少有98%。我们还评估了机器人S以墙为导向收集树叶的能力。结果，大约一半的树叶被遗漏了，因为鼓风机没有对准被吹起的树叶的着陆点。原来，我们需要研究喷流的三维行为，为未来的工作。
【来源】 19th International Conference on Automation Science and Engineering (CASE 2023) 19th International Conference on Automation Science and Engineering (CASE 2023)
【标题】Influence of Mach number on the off-design performance of S-shaped compressor transition duct under the combined effect of curvature and pressure gradient
【参考中译】马赫数对S型压气机过渡道变时性能的影响
【关键词】 S-shaped compressor duct; Mach number; Pressure coefficient; Pressure intensity
【参考中译】 S形压缩机气道;马赫数;压力系数;压力强度
【作者】 Manish Sharma; Beena D. Baloni
【摘要】 The compressor transition duct transfers the air from the low-pressure compressor to the high-pressure compressor. An aircraft always experiences off-design conditions except for level flight conditions during aircraft range. So, to throw some light on the performance of transition ducts under off-design conditions, this paper presents its performance assessment numerically for uniform and swirl flow cases under varying Mach numbers (M). This analysis reveals that a higher Mach number provokes an adverse pressure gradient and non-uniformity. In the uniform flow, the non-uniformity attains a maximum value of 0.04366 near the inner wall, which indicates the presence of a highly distorted flow near the inner wall; however, its maximum value is 0.03661 near to the outer wall in the swirl flow. Also, the pressure recovery reduces with an increased Mach number. Notably, as the Mach number increasesfrom the design point, the pressure coefficient along the convex curvature significantly drops to the lowest point of -0.65015 and -0.79324 for uniform and swirl flow, respectively. Consequently, the inner wall experiences a large adverse pressure gradient (-0.90822) compared to the decreasing Mach number from the design point for the uniform flow, whereas it is experienced by the outer wall in the case of swirl flow (-0.94729).
【参考中译】 压缩机过渡管道将空气从低压压缩机输送到高压压缩机。除了在航程内的水平飞行条件外，飞机总是经历非设计状态。因此，为了了解过渡通道在非设计条件下的性能，本文对均匀和旋流两种情况下的过渡通道在不同马赫数(M)下的性能进行了数值评估。这一分析表明，较高的马赫数会引起不利的压力梯度和不均匀。在均匀流中，非均匀性在内壁附近达到最大值0.04366，这表明在内壁附近存在高度扭曲的流动；而在旋流中，其最大值在外壁附近为0.03661。此外，随着马赫数的增加，压力回复率减小。值得注意的是，随着马赫数从设计点的增加，沿凸曲率方向的压力系数显著下降，对于均匀流和旋流，压力系数分别为-0.65015和-0.79324。因此，在均匀流情况下，内壁经历了较大的逆压差(-0.90822)，而在旋流情况下，外壁经历了较大的马赫数下降(-0.94729)。
【来源】 Australian Journal of Mechanical Engineering 2024, vol.22, no.4
【标题】Experimental Analysis of Solar Dryer
【参考中译】太阳能干燥机的实验分析
【关键词】 Solar dryer; Agriculture products; Solar dryer; Absorber plate; Toughened glass; Baffles; Exhaust pipe; Drying cabinet
【参考中译】 太阳能烘干机;农产品;太阳能烘干机;吸收板;钢化玻璃;挡板;排气管;干燥柜
【作者】 Basavaraj H.; Mathew P. Anthony; Vinay Angadi; Rajesh B.; S. C. Sajjan
【摘要】 Agro-commodities are most commonly dried in open air. For easy usage, low cost dryer in clear and rainy day was the need by many farmers. Present study was intended to study, fabricate and test the solar dryer for drying fruits and vegetables. A model was designed for drying chillies and potatoes by direct solar energy in line with auxiliary drying chamber. Proposed method of drying is comparatively fast and clean. Dried chilli and potatoes may be directly used. Performance analysis is carried out for the developed model, results were satisfactory.
【参考中译】 农产品最常见的是露天干燥。为了方便使用，许多农民需要在晴朗和雨天使用低成本的烘干机。本研究旨在研究、制造和测试用于干燥水果和蔬菜的太阳能干燥机。设计了一个模型，用于通过直接太阳能与辅助干燥室一起干燥辣椒和土豆。提出的干燥方法相对快速且干净。干辣椒和土豆可以直接使用。对开发的模型进行了性能分析，结果令人满意。
【来源】 Journal of Refrigeration, Air Conditioning, Heating and Ventilation 2024, vol.11, no.1
【标题】3D PRINTING TO SUPPORT EXPERIMENTAL ACTIVITIES: LESSONS LEARNED FROM RAPID PROTOTYPING OF AN ELECTROMECHANICAL ACTUATOR GEARBOX
【参考中译】3D打印支持实验活动：从机电致动器变速箱快速原型中吸取的教训
【关键词】 3D printing; Additive manufacturing; Aircraft flight controls; Electromechanical actuator
【参考中译】 3D打印;增材制造;飞机飞行控制;机电致动器
【作者】 Pier Carlo Berri; Matteo D. L. Dalla Vedova; Alessandro Aimasso; Carlo G. Ferro; Paolo Maggiore; Guido Riva
【摘要】 Additive manufacturing has been gaining widespread diffusion in the last few years, thanks to the availability of inexpensive desktop 3D printers based on Fused Filament Forming (FFF)and Stereolytography (SLA) technologies. Both in academic and industrial contexts, this technology can efficiently support the setup of laboratory activities, significantly reducing costs and time associated with the development of experimental test benches. For example, the design and manufacturing of custom fixtures and mock-ups can be significantly sped up, taking advantage of the unprecedented flexibility of desktop additive manufacturing machines. This work summarizes the use of FFF 3D printing for the development of a test bench intended to characterize the behaviour of an electromechanical actuator for aircraft flight controls. FFF 3D printing allowed to quickly manufacture a functional prototype of the actuators' main reduction gearbox. This complex assembly is one of the most critical components of an electromechanical servosystem, as it performances, in terms of efficiency, gear ratio, and reliability, dramatically influence the overall behaviour of the actuator.
【参考中译】 在过去的几年里，由于基于熔丝成型(FFF)和立体摄影(SLA)技术的廉价台式3D打印机的出现，添加剂制造得到了广泛的普及。在学术和工业环境中，这项技术可以有效地支持实验室活动的设置，显著降低与开发实验测试台相关的成本和时间。例如，利用台式附加制造设备前所未有的灵活性，可以显著加快定制夹具和模型的设计和制造。这项工作总结了FFF3D打印在开发试验台方面的应用，该试验台旨在表征飞机飞行控制中机电执行器的行为。FFF3D打印允许快速制造执行器主减速箱的功能原型。这种复杂的组件是机电伺服系统中最关键的组件之一，因为它在效率、传动比和可靠性方面的性能极大地影响了执行器的整体性能。