Poly(methyl methacrylate) (PMMA) bone cements suffer from insufficient mechanical strength, often leading to aseptic loosening and implant failure. To address this, PMMA/SiO2 nanocomposites were synthesized via the in-situ sol-gel method, incorporating a quantitative dispersion index (D0.2) to rigorously evaluate particle distribution. Real-microstructure Finite Element Analysis (FEA) was employed to simulate stress evolution and test the hypothesis that well-dispersed silica acts as a physical ...

Leading manufacturers require consistent measurement results between their own coordinate measuring machines (CMMs) and those of their suppliers, but calibration certificates and aggregate Gage R&R provide limited direction-specific diagnostic information. This study proposes a directional consistency analysis framework combining calibrated-reference deviations, leave-one-out peer comparison, directional performance indicators, and cross-feature comparison using the Directional Coverage Ratio (D...

This paper proposed a thermal elasto-hydrodynamic lubrication (TEHL) inverse approach to estimate the pressure distribution, the temperature distribution, and the pressure-viscosity index in an TEHL point contact. Once the film shape is measured, the least-squares criterion is used to obtain the smallest error between the measured and estimated film thickness. Furthermore, the pressure and estimated film thickness distributions can be calculated from force balance and elastic deformation theorie...

In this paper, a two-dimensional simulation of a laminar confined slot-impinging jet with a baffle is conducted. A constant temperature is imposed on the bottom wall, while the other walls are treated as adiabatic. ANSYS Fluent, a commercial computational fluid dynamics (CFD) software is used to solve the governing equations. The mesh setting is validated by comparing numerical predictions of pressure coefficient and stagnation point Nusselt number with previous studies in the literature. The ef...

Precision machining is often suffers by dynamic errors, vibrations, and thermal distortions that detrimentally affect accuracy and increase machining time. To address these issues, the present study proposes a systematic methodology integrating Finite Element Analysis (FEA), Experimental Modal Analysis (EMA), and a real-time Prediction Diagnosis Performance System (PDPS) to evaluate dynamic behavior and compensate for errors in CNC machine. Experimentally validated with impact hammer tests, achi...

The objective of this study is to investigate the effect of surface texture on the friction performance of continuous rotary motor friction pairs. A simplified model of the gap flow field between the motor blade and stator friction pair was constructed. Simulations of fluid models with varying textures were conducted using FLUENT software to analyze the relationship between the maximum positive pressure of the oil film, load-carrying capacity, and friction coefficient. Based on the simulation re...

Rotating systems are essential components in various machinery and equipment, such as pumping stations, where precise alignment is crucial for optimal performance. Couplings, which connect motors to driven shafts, must balance rigidity and flexibility to meet dynamic operational demands. However, due to their flexibility, these systems are susceptible to vibrations and misalignments, often introduced during installation. This study addresses the uncertainty in the dynamic response of a rotating ...

Vibrations in a railway coach are an important aspect that decides passengers' comfort level. These vibrations may be evaluated using several methods. The basis is to determine the inputs at the wheel-rail interface, then process them in terms of acceleration and assess the vehicle vibrations based on recommended comfort guidelines, i.e., the Sperling method, ISO-2631, etc. In the present work, a railway vehicle coach model is formulated using four approaches, i.e. analytical method (assigning i...