Design a new type of external fixation device that is small in size, high strength, and capable achieving the mechanical requirements for fracture healing. Verify rationality effectiveness treating tibial fractures through finite element analysis biomechanical comparative tests. Finite simulation was performed on to treat fractures, verify whether properties meet A gap model created using Sawbones simulate midshaft comminuted fractures. The experiment divided into four groups, testing...

Purpose This study aims to present the design and validation of a novel high-precision device for characterizing fatigue friction behavior sealing rings under realistic operating conditions, addressing critical gaps in existing experimental systems. Design/methodology/approach The modular integrates servo-driven motion stage with ball screw mechanism precise displacement control (resolution: 1 µm, speed error <0.3%), paired high-fidelity sensors (force resolution: 0.03 N, nonlinearity:...

Abstract Vision perception and precise measurement are crucial for enhancing the detection capabilities of pipeline robots. The structured-light (SL) sensor is widely used in inspection due to its strong resistance interference high stability. In order implement automatic a pipeline’s inner surface, this paper develops three-dimensional (3D) vision measuring system based on robot equipped with multi-directional SL sensor. geometric imaging model firstly established, allowing quantitative...

A temperature compensation system is designed and fabricated to eliminate effects, which will significantly affect the measuring precision for silicon-on-sapphire pressure sensor. This uses a high sensor high-performance digital circuit achieve compensation. It mainly composed of (PT100), analog filters, highly integrated chip with two 24-bit analog-to-digital converters, programmable gain amplifiers, an on-chip processor. Temperature drift under each point modified compensated by using...

Multidirectional stereo vision sensors (MVSs) have been paid increasing attention in the fields of environment perception and 3-D reconstruction attributed to their advantage wide field view (FOV). Vision sensor setup requires parameters be calibrated accurately, which remains a challenging problem because discontinuity camera field. This article proposes flexible calibration method using an unconstrained target for quad-directional (QSVS) composed single dual mirror pyramid. We build...

A compensation method for nonlinear vibration of a silicon micro resonant sensor is proposed and evaluated to be effective through simulation experimental analysis. Firstly, the parameter characterization model established, which presents significant nonlinearity because beam. verification circuit devised imitate behavior by matching measurement error frequency offset produced block with theoretical counterparts obtained from model. Secondly, principle studied, dealing characteristics beam...

A new maglev sensor is proposed to measure ultra-low frequency (ULF) vibration, which uses hybrid-magnet levitation structure with electromagnets and permanent magnets as the supporting component, rather than conventional spring of magnetoelectric vibration sensor. Since lower measurement limit needs be reduced, equivalent bearing stiffness coefficient damping are adjusted by sensitivity unit closed-loop control system, realizes both solving algorithms. simple experimental platform then...

A new method with laser interferometry is used to enhance the traceability for sinusoidal pressure calibration in water. The vibrometer measures dynamic based on acousto-optic effect. relation of refractive index water and optical path length pressure's change built Lorentz-Lorenz equation, conversion coefficients are tested by static situ. device a piezoelectric transducer resonant pipe set up generate 20 kHz. With coefficients, reference measured interferometer sensors' calibration....

Purpose Being the key sensitive elements of micro-electromechanical systems (MEMS) resonant sensors, performance double-ended tuning fork (DETF) will affect precision whole sensor greatly. Currently, most research on DETF is concentrated ideal theory or simply mentioned as part sensor. But, in engineering occasions, there exists many factors such additional mass, air damping and fabrication process, etc. However, few references are individually aimed at mechanical characters DETF. To choose...

An auto-adjust 6-wheeled in-pipe robot system is designed, which suitable for pipelines with different diameters. It composed of the support structure, driving and diameter-change structure. adopts a 120° evenly distributed connected structure presses wheels against pipeline. With these structures, can work in pipeline diameter 100mm ~ 200mm. The designed to detect inner surface, image sensors be fixed ends carry out task.

In this study, a comb-type capacitive accelerometer based on silicon carbide (SiC) microstructure is presented and investigated by the finite element method (FEM). It has advantages of low weight, small volume, cross-coupling. Compared with silicon(111) accelerometers same structure, it higher natural frequency. When vibrates, its resistive force consists two main components: viscous damping an elastic force. was found that dominates at frequency, high The second-order linear system analyzed...