This study analyzes O-ring sealing failure under low-temperature and high-pressure conditions using a finite element model. Results show that retaining rings improve sealing pressure and prevent extrusion. Low temperatures reduce contact pressure, increasing leakage risk. Larger O-ring diameters enhance sealing.

In this paper, an improved mesh excitation calculation method with random cumulative pitch errors is constructed, and a lumped-parameter model for the herringbone planetary gear system is established. Subsequently, the action of random cumulative pitch errors on mesh excitations under different loads is studied. Furthermore, the dynamic mesh forces for all mesh pairs of the herringbone planetary gear system are investigated in detail, considering the effects of random cumulative pitch errors.  

This research addresses a critical gap in marine transport safety by developing a realistic computer model to simulate how large underwater cable pallets behave when accidentally dropped during handling. 

This article introduces a new type of magnetic coupler which overcomes traditional limitations such as poor scalability and limited torque control. Its stackable disks and unique flux adjustment mechanism enable precise and wide-range torque adjustment without moving the disks. Through modeling verification, this design achieves high torque and excellent controllability, providing a practical solution for high-performance magnetic transmission in compact industrial applications.

This paper analyses the effects of several typical polygon amplitudes and orders on wheel sound radiation in metro lines. Concurrently, research has found that there is no linear relationship between wheel–rail forces and polygon amplitudes. Furthermore, the noise reduction mechanism of resilient wheels is thoroughly explained in terms of damping, energy dissipation, vibration isolation, decoupling, and acoustic impedance characteristics. 

In this study, based on a three-dimensional transient temperature field simulation model considering the equivalent thermophysical properties of Al matrix and SiC particles, a cutting force decomposition model for pulsed laser-assisted cutting of SiCp/Al composites is established. At the same time, the difference between experimental value and theoretical value is less than 20 %, which proves the reliability of the cutting force model.

The performance of servo actuators is significantly affected by factors such as friction and backlash. Simplified analytical models have difficulty meeting the increasing demands of control systems. Therefore, this study proposes a new data-driven method for modeling nonlinear factors. Through experimental verification, the newly proposed modeling method significantly improves the accuracy of nonlinear models. This achievement provides strong support for the precise control of servo actuators.

We developed a new tool to solve the challenge of installing high-strength bolts within the extremely compact spaces of aircraft engines. Our design employs a unique ratchet–pawl mechanism driven by a hydraulic cylinder to generate high torque. Testing confirmed that the tool can safely deliver an average torque of 136 N m within a mere 4 mm gap. This successful innovation enhances assembly safety and efficiency in confined areas and establishes a foundation for the intelligent tools.

We created a robot called DTransleg that can walk on legs or roll on wheels using a simple, transformable design. Its upper leg doubles as a wheel rim, allowing smooth switching between walking and rolling. Tests with simulations and a real prototype show stable motion and easy transitions, paving the way for robots that adapt to different environments.

Rigid-flexible coupling is the development trend of lightweight parallel mechanisms. To solve the kinematic problems of such mechanisms, this paper takes the rigid-flexible coupling parallel mechanism driven by elastic thin rods as the research object, proposes an inverse geometrico-static problem (IGP) solution, and conducts relevant motion tests to verify that the solution has high accuracy. This paper can effectively solve the IGP and provide theoretical support for practical application.

The experimental results show that the oil mist is the better cutting fluid compared with dry cutting and jet cold air, producing not only the smallest specific cutting force but also the smallest surface roughness and dimensional error. Therefore, oil mist is beneficial to micromilling of thin walls made of the Ti-6Al-4V titanium alloy by polycrystalline diamond end mills.

In order to improve the stability and comfort of the trolley in the driving process, this study mainly discusses the permanent magnetic spring shock absorber. Its performance is analyzed by theory, simulation, and experiment. The results show that compared with the traditional spring, the permanent magnetic spring not only has better shock absorption performance but can also greatly reduce the frequency of repair and replacement, thereby effectively reducing maintenance costs.

We studied how street sweeping vehicles remove dust and debris by combining rotating brushes with suction. Using computer simulations, we showed how brush angle, speed, and suction strength work together to influence cleaning results. Our findings reveal that the right balance of these factors creates a strong airflow zone that captures particles efficiently. This research helps improve sweeper design, leading to cleaner streets, lower energy use, and healthier urban environments.

Our study examined how dredging machines cut through soft rock to enhance efficiency and minimize wear. Computer simulations revealed that cutter teeth near the hub wore 30 times faster than outer teeth, with severe wear concentrated at tooth tips and upper surfaces. Cutting forces increased significantly with traverse speed but decreased with rotation speed. The most energy-efficient operation occurred at 0.2 m^-s traverse speed combined with 20 rpm rotation speed.

In this work, according to the characteristics of a high-speed motorized spindle, the comprehensive stiffness model of its support bearing is first established. On this basis, a dynamic model of a motorized spindle system is proposed using Timoshenko beam element theory and a finite element method. Then, the dynamic characteristics of a high-speed motorized spindle system under the combined action of high-speed effect and thermal effect are solved and verified by experiments.

We developed a crane damper that uses a movable damping mass instead of concrete counterweights. This controls wind-induced swaying/twisting without causing space loss. Simulations show a reduction in swaying of ~49 % and movement of ~24 %. A mass ratio of 3 %–4 % yields the best results, safely maximizing control. The rear design matches the efficiency of medium-sized crane systems (75 %–91 %) while avoiding top-space conflicts – ideal for crane retrofits or space-constrained sites.

We designed a shape-shifting spherical robot that overcomes terrain limitations of traditional rolling designs. It contracts to pass through narrow gaps and expands to cross obstacles. The system combines pendulum-based propulsion, rotor-assisted stabilization, and gear-actuated folding arms. Tests and simulations confirm that it maintains straight paths and adapts well to slopes, voids, and rough ground, making it ideal for search, space, or field tasks.

We developed a fast and compact model to detect pedestrians in crowded scenes, especially when people are partly hidden or far away. Our method improves how the model learns from small and difficult cases, and how it balances speed and accuracy. It runs much faster than current systems while maintaining similar accuracy, making it suitable for real-time use on mobile and edge devices.

A novel moving mechanism based on three-dimensional Hilbert curves is proposed, combining mathematical curves with mechanical design. The Hilbert curve first-order mobile mechanism (HFCM) moves through seven actuated joints and is analysed for stability and kinematics. Its ability to walk statically, rotate, and climb stairs is experimentally verified.

Inspired by the azimuthal stability of bent straws, we designed a statically balanced compliant torque coupling to achieve near-perfect efficiency. Numerical and analytical modelling revealed bending stability and enabled programmable design. Scanning results corroborated simulations, demonstrating periodic deformation and conserved strain energy in materials during torsion. Testing confirmed that 98° torque transmission achieves over 75 % efficiency, surpassing conventional flexible couplings.

This paper introduces a continuum-based layer jamming model (CLJM) for structures with a large number of layers, treating them as a continuous medium. The CLJM effectively analyzes internal stress distribution and deformation across different mechanical states. Validation via finite-element analysis and experiments shows strong agreement, demonstrating that the CLJM provides an accurate and efficient theoretical tool for designing variable-stiffness applications.