Purpose Polyetheretherketone (PEEK) is used to manufacture biomedical implants because it has a high strength-to-weight ratio and strength biocompatible. However, the use of fused deposition modeling print PEEK results in low crystallinity. This study aims Taguchi method optimize printing factors obtain highest tensile printed object. The annealing effect on object crystallinity are also investigated. Design/methodology/approach determines including speed, layer thickness, temperature...

Utilizing a nonlinear creep model, the dynamic behavior of tilting railway vehicles moving over curved tracks with rail irregularities and under earthquakes wind loads is studied. The car model adopted consists 28 degrees freedom, capable simulating lateral, vertical, roll yaw motions for wheelsets, truck frames body. derailment quotient investigated to analyze running safety vehicle using linear models, while considering environmental forces various angles. Generally, risk higher than that...

Based on the heuristic nonlinear creep model, coupled differential equations of motion a ten-degree-of-freedom truck system, considering lateral displacement, vertical roll and yaw angles each wheelset, displacement angle frame, moving curved tracks, are derived in completeness. To illustrate accuracy analysis, limiting cases examined. The influences suspension parameters, including those losing six-degree-of-freedom critical hunting speeds evaluated via linear models, respectively, studied compared.

This study proposes a new methodology for dental implant customization consisting of numerical geometric optimization and 3-dimensional printing fabrication zirconia ceramic. In the modeling, exogenous factors shape include thread pitch, depth, maximal diameter neck, body size. Endogenous are bone density, cortical thickness, non-osseointegration. An integration procedure, including uniform design method, Kriging interpolation genetic algorithm, is applied to optimize geometry implants. The...

This study increases the strength of a honeycomb structure under static load using an innovative and integrated multi-objective optimization procedure. Using uniform design experiment, group simulation experiments is generated. Finite-element analysis utilized to determine maximum von Mises stresses in core for three ASTM testing simulations. Kriging interpolation used produce surrogate models that correspond results design. To allow be reduced simultaneously, grey relational analysis,...

With the rapid changes in manufacturing technology of bicycle, safety and performance a bicycle are important remarkable research subjects. In this study, an innovative integrated optimization procedure for multi-objective on-road frame is presented. The multiple objectives to reduce frame’s permanent deformations decrease mass. First, uniform design experiments applied create set sampling points space control factors. Second, three-dimensional solid models frames constructed under...

A new dynamic model of railway vehicle moving on curved tracks is proposed. In the model, motion car body considered and truck frame not restricted by a virtual boundary. Based heuristic nonlinear creep coupled differential equations an eight degrees freedom system—considering lateral displacement yaw angle each wheelset, frame, half body—moving are derived completely. To illustrate accuracy analysis, limiting cases examined. It shown that influence gyroscopic moment wheelsets critical...

Using a heuristic linear creep model, this study derives the governing differential equations of motion for railway vehicle traveling on curved tracks. The is modeled as car system with 27 degrees-of-freedom (DOFs), taking into account lateral and vertical displacements, roll yaw angles wheelsets truck frames, well displacement, body. effects speeds derailment quotients offload factors related to running safety are evaluated by both nonlinear models various radii Sperling modified index...

The main aim of this article was to introduce the application a uniform design for experimental methods drop micromotion novel ITI dental implant model under dynamic loads.Combining characteristics traditional and Nano-Tite implants, new with concave holes has been constructed.Compared model, significantly reduced by explicit finite element analysis.From experiments, analysis method applied caluculated maximum full model.Finally, chief in all experiment simulations which cause minimum is...

Based on Kalker's linear theory and the heuristic nonlinear creep model, coupled differential equations of motion are derived for a vehicle model with 20 degrees freedom, considering lateral displacement yaw angle each wheelset, displacement, vertical roll bogie frame, car body moving curved track. The dynamic responses railway wind loads acting laterally vertically, moments about longitudinal axis investigated. analysis results indicate that oscillation amplitude increases as speed...

Based on the nonlinear creep model and Kalker's linear theory, this paper studies governing differential equations of motion for a tilting railway vehicle moving over irregular curved tracks under wind loads. The is modeled by 24-degree-of-freedom (24-DOF) car system, considering lateral, roll yaw motions each wheelset, vertical, bogie frame body. derailment quotients with wheelsets rails in lateral direction body acted upon loads are investigated various angles. analysis results show that...

The ride comfort of a tilting railway vehicle moving on curved tracks with rail irregularities is studied. Using the nonlinear creep model and Kalker's linear theory, governing differential equations motion for running irregular are first derived. modeled by 27 degree-of-freedom (DOF) car system, considering lateral displacement, vertical roll angle yaw both wheelsets bogie frames, as well body. Based international standard ISO 2631-1, effect speed index investigated various angles, using...

The aim of this paper is to investigate the derailment a tilting railway vehicle on curved tracks that are experiencing twin effects rail irregularities and an earthquake. nonlinear governing differential equations motion for derived using heuristic creep model Kalker’s linear theory. modeled as 24-degree-of-freedom system, with lateral, roll yaw motions each wheelset, well vertical, bogie frames car body all taken into account. quotients offload factors earthquake its wheelsets, in lateral...

This study proposes an innovative three-dimensional printing technology with submersion-light apparatus. A zirconia powder average particle size of 0.5 µm is mixed 1,6-Hexanediol diacrylate (HDDA) and photo-initiator to form a slurry. The weight percentage HDDA 70:30 wt.%. light engine box submerged in slurry emits layered pattern induce photopolymerization transform into printed green body. Green body sintering parameters for the first second stages are 380 °C holding time 1.5 h 1550 2 h....

A non-linear creep model that considers non-constant coefficients vary as a function of vehicle speed is derived using Hertz contact theory, Kalker’s linear theory and heuristic model. The proposed created by modifying the adding moment semi-axis lengths in non-linearity saturation constant. In this paper, modeled system with 28 degrees freedom, taking into consideration lateral displacement, vertical roll angle yaw each wheelset, truck frames car body. To analyze respective effects major...

This paper, based on uniform design and quantum-behaved particle swarm optimization (QPSO), aims to solve the sensitivity problem of a railway vehicle system with fourteen degrees freedom nonlinear coupled differential equations motion. The is very sensitive wheel conicity if suspension parameters are not designed properly. A new heuristic creep model applied determined by adding linear moment semi-axis lengths in nonlinearity saturation constant. vehicle's critical hunting speed Lyapunov's...

The purpose of this paper is to improve the safety factor as well weight an on-road bicycle frame. main performance target, minimum fatigue factor, in frame during test simulations analyzed by using ANSYS/Workbench software. Six dimensional parameters are selected control factors be improved. Because all continuous, uniform design experiments method employed plan a set experiments. To determine each frame, finite element analysis used simulate behavior which undergoes three simulations....

The electric assisted bicycle is the new transportation tool in 21st century. proposal of this article to upgrade fatigue safety factor for an frame by integrating uniform design, Kriging interpolation, entropy weighting method, grey relational analysis, and genetic algorithm. According EN 15194 standard, main objective function, examined ANSYS/Workbench software under three testing simulations. Five geometry parameters are nominated be improved control factors. Since all factors continuous...

Si-based micro pulsating heat pipes (μPHP) charged with HFE-7100 were tested at several heating powers two orientations, θ = 0° and 90°. The width of the channel is 0.8 mm in a μPHP having uniform channels, 1.0 or 0.6 other μPHP. depth each 0.25 mm. overall size 60 × 10 1.25 Both visual observation temperature response present μPHPs various conditions performed. performance was compared between either channels non-uniform difference powers. Results showed that both could not start two-phase...

Based on the heuristic nonlinear creep model, coupled differential equations for motion of a two-axle bogie moving curved tracks are derived, considering inertia forces. To illustrate accuracy analysis, limiting case is examined. Finally, difference between influences suspension parameters critical hunting speed evaluated by linear model and compared. In addition, with various radius curvature also presented.

An integrating optimization procedure is presented to improve the von Mises stress and fatigue safety factor for a handlebar stem system in bicycle system. The involves uniform design of experiment, Kriging interpolation, genetic algorithm, nonlinear programming method. Using ANSYS/Workbench software ISO 4210 testing standard, lateral bending test simulation calculated. are combined into single integrated objective function, interpolation then used create surrogate model function. When used,...

This paper introduces the application of uniform experimental design to improve dental implant systems subjected dynamic loads. The micromotion Zimmer system is calculated and illustrated by explicit finite el