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Editorial Office

University of Ljubljana
Faculty of Mechanical Engineering
Journal of Mechanical Engineering

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SI-1000 Ljubljana
Slovenia

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E: info@sv-jme.eu



The journal is subsidized by Slovenian Research Agency.

 
ISSN: 0039-2480

Journal of Mechanical Engineering 63 (2017) 7-8

 

 

 


 

Absolute Nodal Coordinate Formulation in a Pre-Stressed Large-Displacements Dynamical System

Authors - Luka Skrinjar, Janko Slavič, Miha Boltežar


Abstract

The design process for dynamical models has to consider all the properties of a mechanical system that have an effect on its dynamical response. In multi-body dynamics, flexible bodies are frequently modeled as rigid, resulting in non-valid modeling of the pre-stress effect. In this research a focus on the pre-stress effect for a flexible body assembled in a rigid-flexible multibody system is presented. In a rigid-flexible assembly a flexible body is modeled with an absolute nodal coordinate formulation (ANCF) of finite elements. The geometrical properties of the flexible body are evaluated based on the frequency response and compared with the experimental values. An experiment including the pre-stress effect and large displacements is designed and the measured values of the displacement are compared to the numerical results in order to validate the dynamical model. The pre-stress was found to be significant for proper numerical modeling. The partially validated numerical model was used to research the effect of different parameters on the dynamical response of a pre-stressed, rigid-flexible assembly.

Keywords - ANCF, pre-stress, multibody system, measurement

Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 417-425, SI 61
DOI:10.5545/sv-jme.2017.4561

 

pdfAbsolute Nodal Coordinate Formulation in a Pre-Stressed Large-Displacements Dynamical System (.pdf 1.0MB)

 


  

LBM Analysis of Micro-Convection in MHD Nanofluid Flow

Authors - Kozhikkatil Sunil Arjun* - Rakesh Kumar


Abstract

The lattice Boltzmann-Bhatnagar-Gross-Krook method was used to simulate Al2O3-water nanofluid to find the effects of Reynolds, Rayleigh and Hartmann numbers, slip coefficient, nanoparticle volume fraction and axial distance on forced convection heat transfer in MATLAB. The ranges of studied Reynolds number, Rayleigh number, magnetic field strength, nanoparticle volume concentration and slip coefficient include 200 ≤ Re ≤ 4000; 103 ≤ Ra ≤ 106; 0 ≤ Ha 90; 0 ≤ φ ≤ 2%; 0.005 ≤ B ≤ 0.02, respectively. The results show that increasing Reynolds number and nanoparticle volume fractions improve heat transfer in the 2D microtube under laminar, turbulent, slip and temperature jump boundary conditions. Decreasing the values of slip coefficient decreases the temperature jump and enhances the Nusselt number. A critical value for the Rayleigh number (105) and magnetic field strength (Ha 10) exists, at which the impacts of the solid volume fraction and slip coefficient effects are the most pronounced. The pressure drop shows a similar type of enhancement in magnitude, as observed in the case of the Nusselt number. However, application of nanofluids for low Reynolds numbers is more beneficial, and the effect of volume fractions are more pronounced in comparison to slip coefficient, though the effects are marginal.

Keywords - magneto-hydrodynamics, Nusselt number, lattice Boltzmann method, microtube, slip coefficient

Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 426-438, SI 62
DOI:10.5545/sv-jme.2016.4248

 

pdfLBM Analysis of Micro-Convection in MHD Nanofluid Flow (.pdf 734KB)

 


 

Thermal Optimization and Comparison of Geometric Parameters of Rectangular and Triangular Fins with Constant Surfacing

Authors - Florent Bunjaku – Risto V. Filkoski – Naser Sahiti*


Abstract

This paper presents an optimization model of fins of rectangular and triangular profiles, based on a constant value of the transverse cutting surface, as well as the optimization of the ratio of efficiency of both fin profiles. The optimization model is based on the analytical and numerical simulation of the heat flux through fins in order to derive relevant thermo-physical parameters of the investigated fin profiles. The optimization of both fin profiles is carried out for different fin materials based on constant heat transfer coefficient and for different fin materials based on variable heat flux. The efficiency of fins as relevant fin goodness parameter is also analysed and the optimal values of the ratio of fin efficiency of both profiles is graphically presented and the optimal value estimated. Numerical simulation of fin models is carried out by using ANSYS/Fluent software.

Keywords - fins, heat flux, optimisation, geometrical parameters, rectangular and triangular profile, fin efficiency

Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 439-446, SI 63
DOI:10.5545/sv-jme.2016.4276

 

pdfThermal Optimization and Comparison of Geometric Parameters of Rectangular and Triangular Fins with Constant Surfacing (.pdf 559KB)

 


 

Modelling Study on Stiffness Characteristics of Hydraulic Cylinder under Multi-Factors

Authors - Hao Feng* – Qungui Du – Yuxian Huang – Yongbin Chi


Abstract

For a complex mechanical system driven by hydraulic cylinders, the dynamic response characteristics of the mechanical system are significantly affected by the stiffness characteristics of hydraulic cylinders. This paper comprehensively studies the impacts of various factors on the stiffness characteristics of the hydraulic cylinders, including the oil bulk modulus, the air content in the hydraulic oil, the axial deformation of the piston rod, the volume expansion of the cylinder barrel, the volume expansion of the metal pipes and the flexible hoses, and the deformation of the hydraulic cylinder sealing. By combining the theoretical analysis and the experimental results, the level of each impacting factor was quantified, and the stiffness model of the hydraulic cylinder was established. Finally, comparative analysis of the stiffness was conducted by taking the experimental hydraulic cylinder as an example; it was verified that the calculated results of the proposed hydraulic cylinder stiffness model approximated the experimental results. Compared with stiffness models presented in current literature, the average accuracy was improved by more than 15 %.

Keywords - hydraulic cylinder stiffness, bulk modulus, air content in hydraulic oil, hydraulic system


Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 447-456, SI 64
DOI:10.5545/sv-jme.2017.4313

 

pdfModelling Study on Stiffness Characteristics of Hydraulic Cylinder under Multi-Factors (.pdf 649KB)




Methodology to Facilitate Successful Lean Implementation

Authors - Tomaž Berlec* – Mario Kleindienst – Christian Rabitsch – Christian Ramsauer

Abstract

The implementation of lean production in a company is a transformation of the whole company’s culture. To achieve such a lean culture, the role and support of management are decisive. This paper introduces a newly defined model and methodology with an interview guide which helps to distinguish a supportive from a non-supportive management team when introducing lean production, and helps to decide if a step needs to be repeated, improved, or the next step can be initiated. The methodology is especially suitable for small and medium-sized enterprises (SME’s), because of their lack of human resources, where this model was also tested.

Keywords - corporate culture, lean production, management learning, interview guide, critical success factors

Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 457-465, SI 65
DOI:10.5545/sv-jme.2017.4302

 

pdfMethodology to Facilitate Successful Lean Implementation (.pdf 545KB)




Development of a Servo-Based Broaching Machine Using Virtual Prototyping Technology

Authors - Hong Seok Park – Duc Viet Dang* – Trung Thanh Nguyen


Abstract

Predicting machine tool performance at the design stage is one way to resolve the time issue and achieve cost savings. The objective of this paper was to develop a new non-hydraulic broaching machine using a servo motor, ball screw, and roll element linear guide using virtual prototyping technology. First, we developed a multi-body simulation model (MBS) of a servo-based broaching machine to investigate its dynamic behaviour. Then, an adaptive sliding mode proportional-integral-derivative (PID)-based controller (ASMPID) was proposed to conduct the broaching process. We then performed a co-simulation between the mechanical structure and virtual controller to investigate the ram body trajectory and identify the optimal control parameters. Finally, we manufactured a prototype machine to evaluate the simulation results and determine the benefits of the new system. Our results indicated that the proposed model, which includes a mechanical structure and intelligent controller, effectively improved broaching machine design. Therefore, this work is expected to improve the prototyping efficiency of new broaching machines.

Keywords - broaching machine, servo motor, ball screw, virtual prototype technology, multi-body simulation, adaptive sliding mode control

Paper's information
Strojniški vestnik - Journal of Mechanical Engineering 63(2017)7-8, 466-475, SI 66
DOI:10.5545/sv-jme.2017.4384

 

pdfDevelopment of a Servo-Based Broaching Machine Using Virtual Prototyping Technology (.pdf 2.3MB)

 



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Journal of Mechanical Engineering

in digital form


SV-JME-10-2017


SV-JME-9-2017


SV-JME-7-8-2017


SV-JME-6-2017

 

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