Recent Patents on Mechanical Engineering - Volume 15, Issue 2, 2022

Background: After a smooth development of life expectancy per capita and fertility in the nineteenth century, the global population increased in size. Along with the demographic shift in the late nineteenth century, the phenomenon of population aging began to appear in developed countries. A survey from UN reports that by 2050, one in six people worldwide will be over 65 years old (16%), compared to 11 (9%) in 2019. Accor Read More

Background: The bionic water strider robot can achieve sliding, jumping, and other movements on the water surface, having advantages of small size, light weight, flexible movements, and other characteristics. It can detect the quality of water, investigate and search the water surface, and perform some other operations. It has a very broad range of applications and development prospects. Therefore, the trend of biomimet Read More

Background: This study was conducted to explore the temperature rise and distribution of the micro-gap lubricating oil film of the hydrostatic and hydrodynamic thrust bearing, solve the problem of thermal deformation of the friction pair of the hydrostatic and hydrodynamic support, and improve the operation accuracy and stability of the hydrostatic and hydrodynamic thrust bearing. Objective: Combined with the theory o Read More

Background: Recent reviews on tooth modification of involute cylindrical gear are presented. Gear pairs are widely employed in motion and power transmission systems. Manufacturing and assembling errors of gear parts, time-varying mesh stiffness, and transmission error of gear pair usually induce vibration, noise, non-uniformly load distribution, and stress concentration, resulting in earlier failure of gear. Tooth modification is Read More

Background: The flow rate distribution in the flat tubes of a micro-channel evaporator is essential for its heat transfer performance. Due to a large number of flat tubes in a microchannel evaporator, the flow rate distribution is often difficult to determine. Objective: An evaporator test rig was constructed to study the quantification of the refrigerant mass flow rate distribution in a two-pass evaporator without destroying its stru Read More

Background: Cr4Mo4 V steel is widely used in high-temperature bearings because of its excellent high-temperature performance. Based on the research status of Cr4Mo4 V nationally and internationally, this paper explores its mechanical properties and friction properties at high temperatures. Objective: To characterize the composition, microstructure, and properties of Cr4Mo4 V steel and explore its tensile prop Read More

Background: Due to the influence of external wind speed and their flight speed, the droplets sprayed by the plant protection Unmanned Aerial Vehicles (UAV) have serious drift and volatilization. Objective: The aim was to study the atomization characteristics of the fan-shaped atomizing nozzle of UAV under different inlet pressures and in different internal cavity diameters. Methods: Firstly, the Realizable k- turbulence mo Read More

Background: High-temperature alloys, such as the nickel-based alloy, have become the main materials for core components in the aerospace field because of their high strength and good toughness. Therefore, how to improve the machining accuracy and stability of electrochemical machining (ECM) of small deep holes on nickel-based alloy is an important topic for studies. The instantaneous high-density current during the puls Read More

Background: In recent years, a kind of drilling method of solid-liquid separation combined with pulsating vacuum formed by vibrating screen and compressed air injection has emerged in oil drilling, which profoundly improves the gas, solid, and liquid separation ability of the drilling fluid vibration screen. Objective: Based on the above ideas, a kind of hydrocyclone used for gas-liquid separation with the pulsating feed bou Read More

Background: In this paper we have developed an intelligent control law for the control of mobile manipulator robots by investigating the various techniques proposed in the literature. Thus, we have adopted a hybrid approach integrating part of classical and advanced automation in order to create an efficient control structure that can cope with a certain level of complexity. Our research logic is based on the process of keepi Read More