n the woodworking beam processing industry, engineers typically rely on CAM software to generate machining codes, which are then executed by NC machines equipped with automated feeding systems. This paper introduces a matrix manipulation approach for the automated extraction of both standard and intersecting features in wooden beam machining, enabling 3D CAD models to be seamlessly transformed into complete toolpaths. The proposed system analyzes the topological and geometric properties of solid...

The study aims to attain precise positioning control of an X-Y platform. Here, square and circular motion trajectories with a trapezoidal velocity profile are planned. Subsequently, decentralized PID controllers are designed to track the predefined reference trajectories. The corresponding experiments are conducted to validate the effectiveness and feasibility of the proposed control scheme. In terms of the experimental results, the average positioning error is smaller than 0.0164 mm in the squa...

This study establishes an exhaust gas recirculation device in a diesel engine and integrate a reformation system of methanol blended with aqueous urea. Modifying the diesel engine's intake inducts hydrogen-rich gas into the exhaust gas recirculation (EGR) for testing and investigating how inducting hydrogen-rich gas influences the engine's exhaust emissions. The results are as follows. The engine exhaust outlet and intake have integrated the EGR system with the methanol and aqueous urea reformat...

To improve the loading capacity, antifriction performance, and the dynamic characteristics of journal bearing, the composite micro-texture journal bearing is studied, the influence of surface roughness and texture arrangements on the micro-textured bearing is further considered. The surface roughness model, the oil film thickness equation of composite micro-texture, the generalized Reynolds equation of journal bearings, the dynamic characteristics calculation model of micro-textured bearing roto...

This paper aims to explore the adaptability of the SPH-FEM coupling method in simulating gear and rack meshing impacts. Taking the gears and racks of a pumping unit as the research object, the adaptive SPH-FEM coupling method is used to simulate gear and rack meshing impacts. This provides a new approach for studying the impact of gear mechanisms that may involve structural damage. The propagation law of the impact stress is obtained, which reveals the microscopic mechanism of formation of the t...

Aiming at the injection mould process parame-ter optimization methods are relatively few, and there is no combination of multiple multi-objective optimi¬zation methods to carry out optimization research. In this paper, the gating system of the upper bracket of automobile front-end frame is designed, and the flow channel system of the upper bracket of automobile front-end frame is simulated. The orthogonal experi¬ment of the upper bracket of automobile front-end frame is designed. The multi-objec...

Continuous fibre reinforced polymer compo-sites are gaining attention in various industries for their ability to create complex geometries and reduce material usage through 3D printing. The previous work focused on either short or continuous fibers individually when examining the role of fiber length in stress transfer mechanisms. This study addresses the gap by investigating the integration of chopped long carbon fibers (0.1 to 1 mm) mixed with nylon as the matrix, and varying continuous fibers...

In a pedestrian–vehicle impact, the lower limbs of pedestrians are extremely vulnerable to injury. In this study, pedestrian lower limb injury was analyzed by establishing the front-end of a sport utility vehicle and advanced pedestrian legform impactor impact conditions. Moreover, a structural parametric study based on the headlight movement space was conducted to reduce pedestrian lower limb injury. Results showed that the maximum bending moment of pedestrians’ lower limbs was reduced by 73 Nm...

In our study, the effects of test parameters on the weld quality in friction stir butt welding of AA7075-T6 and AA6061-T6 aluminum alloy sheets, each with a thickness of 2 mm and dimensions of 125 mm x 100 mm, are examined. Three different control variables, each with three levels, tool inclination angle 1°, 0.5 °, and 0°, tool rotation speed 1000 rpm, 710 rpm, and 500 rpm, tool feed rate 40 mm/min, 28 mm/min, and 20 mm/min were applied. The experiments are carried out to weld AA6061-AA7075, AA7...