Mechanical Science and Engineering is an international, peer-reviewed open access journal dedicated to advancing research the field of mechanical engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: In recent years, high-speed cutting technology characterized by high cutting speed, small feed rate and high cutting accuracy has developed rapidly. High speed cutting technology can improve cutting quality, reduce cost and improve production stability by optimizing cutting parameters. In the actual production process, there are many factors affecting the final cutting quality and the factors are not completely independent, so it is difficult to select the best combination of process parameters. The optimal parameter ratio was determined by using Taguchi analysis through experiments with different combinations of process parameters. The data of tool wear, cutting quality and chip length were obtained through the experimental combination of different cutting parameters; Through Taguchi analysis and fuzzy control, the influence of cutting parameters such as cutting speed, feed rate and cutting depth on the life and quality of the cutting tool is clarified; After optimizing the material of the tool, changing the cutting process parameters and the coating of the tool, the test analysis is carried out in the workshop production process to obtain the best combination. The service life of the edge cutting machine tool is significantly improved, the operation efficiency is effectively improved, the enterprise cost is effectively reduced, and the production continuity is guaranteed.Abstract: In recent years, high-speed cutting technology characterized by high cutting speed, small feed rate and high cutting accuracy has developed rapidly. High speed cutting technology can improve cutting quality, reduce cost and improve production stability by optimizing cutting parameters. In the actual production process, there are many factors affect...Learn More
Abstract: In order to improve the quality and efficiency of intelligent design of manufacturing procedure, a identification and optimal correction for manufacturing procedure design defects based on resource limited immune network is proposed. In this immune identification and correction method, the processing process of the parts to be processed and its processing accuracy requirements are taken as antigens, and the process design of a specific production resource is used as an antibody. Firstly, on the basis of four-layer real coding of the manufacturing procedure represented by the antibody, a defect identification factor and a heuristic local mutation rule of manufacturing procedure were designed. Secondly, the defect identification factor and the heuristic local mutation rule were respectively used for intelligent identification and automatic correction of antibodies with design defects, and the modified results are verified by defect identification factors. Finally, three immunological operations, namely selection, mutation and crossover, are used to optimize the antibody, so as to obtain the optimal antibody without processing design defects. Moreover, to realize the correction of nondestructive optimal for machining design defects, the introduction of energy function and penalty factor to ensure the fact that the optimal manufacturing procedure can satisfy all the constraints, and the effectiveness and rationality of the algorithm are verified by numerical examples.Abstract: In order to improve the quality and efficiency of intelligent design of manufacturing procedure, a identification and optimal correction for manufacturing procedure design defects based on resource limited immune network is proposed. In this immune identification and correction method, the processing process of the parts to be processed and its pro...Learn More
Abstract: As a safety valve, check valve plays a key regulatory role in the seawater transportation system. When the seawater medium contains solid particles, the long-term impact of liquid-solid flows leads to erosion in check valve as well as lax sealing and leakage, which affects the safe operation of the transportation system. In this article, numerical simulations were carried out to study effects of valve opening degree and particle diameter on particle motion and erosion characteristic in a model check valve. Particle motion and erosion distributions were analyzed at different valve opening degrees and particle diameters to provide theoretical support for structure optimization of erosion protection in check valves for seawater transportation. Results show that under the same particle diameter, high-speed jet flows are generated at the downstream of the valve core. The intensity of the high-speed jet flows gradually decrease and the erosion on the main wall decreases with the increase of valve opening degree. When valve opening degrees is larger than 60%, the intensity of high-speed jet flows and erosion distributions are changed slightly. At the same valve opening degree, with the increase of particle diameter, the settlement of particles near valve core and pipe becomes more obvious and erosion increases with the erosion position moving toward the downside of valve core and pipe at the downstream.Abstract: As a safety valve, check valve plays a key regulatory role in the seawater transportation system. When the seawater medium contains solid particles, the long-term impact of liquid-solid flows leads to erosion in check valve as well as lax sealing and leakage, which affects the safe operation of the transportation system. In this article, numerical ...Learn More
Abstract: As an important tool for guiding and introducing visitors to the exhibition hall, the robot needs to confront the complex environment that may exist and the constantly moving visitors. First of all, it is needed to have the ability to enable accurate positioning and navigation as well as dynamic obstacle avoidance. In recent years, simultaneous localization and mapping (SLAM) technology has been widely used to address localization and navigation issues in unknown indoor environments. Based on the robot operating system (ROS), this study collects environmental information by 2D LiDAR, and then combines the service robot's Inertial measurement unit (IMU), odometer, and other sensors to map the exhibition hall environment by the Cartographer SLAM algorithm. Path planning and dynamic obstacle avoidance functions are also implemented, in path planning, the algorithm is selected for global path planning and the Dynamic Window Approach (DWA) algorithm for local path planning. The environment map construction, path planning and dynamic obstacle avoidance functions are verified by simulation and in real environment. The average position deviation and standard deviation (SD) of the robot from the target point were less than 7 cm and less than 3 cm, respectively, when the robot was set to move at 0.5 m/s for the positioning test. The average heading deviation was less than 9° and SD was less than 3°. The robot's positioning and navigation can well meet the working requirements of the pavilion service robot.Abstract: As an important tool for guiding and introducing visitors to the exhibition hall, the robot needs to confront the complex environment that may exist and the constantly moving visitors. First of all, it is needed to have the ability to enable accurate positioning and navigation as well as dynamic obstacle avoidance. In recent years, simultaneous loc...Learn More
Abstract: Pump-controlled single-rod hydraulic cylinders are energy-saving and efficient, which is the development direction of hydraulic systems in the future. However, the flow imbalance caused by the unequal effective areas of the two chambers of single-rod hydraulic cylinders has always restricted the development and application of pump-controlled single-rod hydraulic cylinders. The flow rate of the inlet and outlet ports of the ordinary axial piston pump is equal and the flow rate of the large and small chambers of the single rod hydraulic cylinder does not match. In order to solve this problem, the ordinary axial piston pump is improved into an asymmetric axial piston pump, on this basis, the flow distribution mechanism of the asymmetric axial piston pump is explored, and the design theory of the asymmetric axial piston pump is improved. Theoretical analysis of the relationship between the angle of the distribution window of the asymmetrical axial piston pump and the area ratio of the single-rod hydraulic cylinder is carried out, and its mathematical model is derived. Design of valve plates for asymmetrical axial piston pumps to match single rod hydraulic cylinders with different area ratios. The physical model of the asymmetrical axial piston pump and the asymmetrical axial piston pump controlled single-rod hydraulic cylinder system was established in the computer simulation software AMESim. The simulation analysis of the inlet and outlet flow of the asymmetric axial piston pump under different working conditions and the matching of the asymmetric axial piston pump and the single-rod hydraulic cylinder with different area ratios. The simulation results show that the use of an asymmetrical axial piston pump can compensate the flow imbalance caused by the unequal effective areas of the two chambers of the single-rod hydraulic cylinder, so that the flow of the asymmetrical axial piston pump and the single-rod hydraulic cylinder can completely match.Abstract: Pump-controlled single-rod hydraulic cylinders are energy-saving and efficient, which is the development direction of hydraulic systems in the future. However, the flow imbalance caused by the unequal effective areas of the two chambers of single-rod hydraulic cylinders has always restricted the development and application of pump-controlled single...Learn More
Abstract: Unmanned Guided Vehicle (AGV) is a new type of mobile robot that was applied in various fields. Aiming at the design of dedicated AGV transport vehicle for complex road conditions, this AGV transport vehicle is composed of chassis, traveling mechanism, lifting device, and removable components. By designing and analyzing the mechanical structure of the AGV transport vehicle, and it’s combined with statics theory, and the feasibility of the trolley structure is designed and discussed. The three-dimensional model of AGV transport vehicle is established by Solid Works software, and the cloud diagram of the stress and deformation of the wheel system structure is analyzed by Solid Works Smillation, and the traveling mechanism of the trolley is analyzed by statics. The rationality of the wheel system structure is verified by the deformation cloud diagram of the AGV transport vehicle under various working conditions. Based on the mathematical model optimization of variable density method, the car body frame is optimized and designed to these materials of car body. The design of the track tensioning structure and frame is obtained according to the four general engineering parameters of TRIZ theory. Finally, the modeling design of intelligent AGV transportation car is carried out by using the principles such as division, color change, and dimension change, etc. In order to facilitate the take-off and landing loading and unloading of goods for AGV transportation lifting device, and it is changed to the traditional handling mode of manpower-operated machines.Abstract: Unmanned Guided Vehicle (AGV) is a new type of mobile robot that was applied in various fields. Aiming at the design of dedicated AGV transport vehicle for complex road conditions, this AGV transport vehicle is composed of chassis, traveling mechanism, lifting device, and removable components. By designing and analyzing the mechanical structure of ...Learn More
