An autonomous launch and recovery (LAR) system is essential for the deployment and retrieval of uncrewed surface vehicles (USVs). Traditional crane-like LAR systems are typically designed to handle only the deployment and recovery of a single USV. In this paper, we propose a novel crane-like LAR system for multiple USVs, which includes the mechanism design, control strategy, and experimental validation. This research provides a reliable and innovative solution for the LAR of multiple USVs.

The frame is a key component of a small electric vehicle. As the main load-bearing body, lightweight design of the frame can meet its strength and deformation requirements while avoiding resonance with road excitation, which can reduce vehicle costs while meeting performance requirements.

In this paper, the dynamic performance of large parabolic antenna support structures is thoroughly studied, a multi-component modular dynamic assembly method is proposed, and a module is established to solve the high-dimensional differential equations by modular coalescence and a recursive algorithm, which is of great reference value for this kind of expandable truss antenna with multiple identical sub-rings.

We establish a size optimization model of the Watt-II six-bar mechanism combined with the particle swarm algorithm and then complete the size optimization of the Watt-II six-bar mechanism. After analyzing the optimization effect, the results show that the mechanism after size optimization could effectively improve the output efficiency and capacity.

This study proposed an analytical model of a fixed-rotation constrained-arc segment. Based on this, a novel two-stage constant-torque bending hinge is designed, and an optimization study is carried out. Finally, the feasibility of the design scheme is verified by theoretical analysis, finite-element analysis, and experiments. The new bending hinge provides a proficient solution for the design of fixtures, joint rehabilitation devices, and human activity assistive devices.

The fuzzy proportional–integral–derivative controller optimized by the particle swarm optimization algorithm eliminates steady-state error, improves response speed, and enhances both system adaptability and disturbance resistance. This approach effectively addresses the inherent uncertainties and nonlinear variations in bolt tightening processes. The average deviation between the tightening torque and target torque measures 0.108 N m, achieving a control accuracy of 0.9%.

In this paper, a micro-textured coated tool is proposed to improve the cutting performance of the tool by utilizing the synergistic effect of the micro-texture and coating material, and it is found that the coated tool with the micro-texture on its front and back face induces a reduction in the cutting force by 21.57 % and a reduction in the cutting temperature by 7.56 %, which effectively facilitates chip outflow and avoids the buildup of cutting heat on the tool surface.

In this paper, an entire process of laser cladding repair of a damaged polycrystalline diamond compact (PDC) bit of high value based on a dual-robot system is proposed.

To solve the flutter identification problem in the machining process of thin-walled parts, an online monitoring method based on continuous wavelet transform (CWT) and convolutional neural network–vision transformer (CNN-ViT) is proposed. First, the CNN model is utilized to extract local features from the image obtained after CWT. Then, the self-attention mechanism of the ViT model is employed to capture the global features of the feature map, and, finally, the classification results are output.