International Journal of Design Engineering http://www.inderscience.com/browse/index.php?journalID=211&year=2011&vol=4&issue=3 Inderscience Publishers Ltd en-uk International Journal of Design Engineering 1751-5874 1751-5882 © 2011 Inderscience Publishers Ltd editor@inderscience.com https://www.inderscience.com/images/files/coverImgs/ijde_scoverijde.jpg http://www.inderscience.com/browse/index.php?journalID=211&year=2011&vol=4&issue=3 http://www.inderscience.com/link.php?id=45275 In this paper, finite element modelling and Taguchi's method of experimental design were combined as a tool and applied to the design of the mechanical structure of a micro milling machine. Sensitivity analysis of the machine structural configuration was conducted using a mathematical model obtained from shaping function theory which was improved by considering the squareness errors between neighbouring elements, the deflections due to the cutting forces and the thermal growth when the entire machine is subjected to a temperature rise. Then the design factors that significantly influence the accuracy of the machine tool were established. Subsequently, the shape of the main structure of the machine, which is its column, was optimised to obtain a three-legged tapered egg-bridge having very high stiffness. Application of finite element analysis and Taguchi method to robust design of a micro milling machine structure
T.I. Ogedengbe; S. Mekid
International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 197 - 219
In this paper, finite element modelling and Taguchi's method of experimental design were combined as a tool and applied to the design of the mechanical structure of a micro milling machine. Sensitivity analysis of the machine structural configuration was conducted using a mathematical model obtained from shaping function theory which was improved by considering the squareness errors between neighbouring elements, the deflections due to the cutting forces and the thermal growth when the entire machine is subjected to a temperature rise. Then the design factors that significantly influence the accuracy of the machine tool were established. Subsequently, the shape of the main structure of the machine, which is its column, was optimised to obtain a three-legged tapered egg-bridge having very high stiffness.

]]> 10.1504/IJDE.2011.045275 International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 197 - 219 T.I. Ogedengbe; S. Mekid Mechanical Engineering Department, School of Engineering and Engineering Technology, The Federal University of Technology, P.M.B. 704 Akure, Nigeria. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia design engineering finite element analysis FEA Taguchi methods micromilling machines experimental design micromachining mathematical modelling machine tool design milling. 2012-02-04T23:20:50-05:00 4 3 197 219 2012-02-04T23:20:50-05:00 http://www.inderscience.com/link.php?id=45276 Product design tasks in the upstream and downstream stages are often interdependent in engineering design processes. When design changes propagate from the upstream to the downstream, or vice versa, design tasks in different stages affect each other. Then solving the relevant design problems has to be repeated if the designer cannot find an acceptable solution to satisfy both downstream and upstream design requirements. In this paper, those design task connections with the interdependent nature or phenomena are referred to as design change propagation couplings and the analysis of the coupling is presented. Two types of coupling morphology named concurrent coupling and sequential coupling are identified. A theoretical method as well as a software system to solve such propagation couplings is developed. A design case of the feeding servo system on a numerical controlled machine tool is used to demonstrate the application of the software. A design exploration method for resolving parameter coupling in engineering change propagation
Yuliang Li; Wei Zhao; Y-S. Ma
International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 220 - 243
Product design tasks in the upstream and downstream stages are often interdependent in engineering design processes. When design changes propagate from the upstream to the downstream, or vice versa, design tasks in different stages affect each other. Then solving the relevant design problems has to be repeated if the designer cannot find an acceptable solution to satisfy both downstream and upstream design requirements. In this paper, those design task connections with the interdependent nature or phenomena are referred to as design change propagation couplings and the analysis of the coupling is presented. Two types of coupling morphology named concurrent coupling and sequential coupling are identified. A theoretical method as well as a software system to solve such propagation couplings is developed. A design case of the feeding servo system on a numerical controlled machine tool is used to demonstrate the application of the software.

]]> 10.1504/IJDE.2011.045276 International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 220 - 243 Yuliang Li; Wei Zhao; Y-S. Ma Department of Mechanical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang Province, 310027, China. ' Zhejiang University of Finance and Economics, 18 Xueyuan Street, Hangzhou, Zhejiang Province, 310018, China. ' Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2G8, Canada propagation coupling engineering analysis evolutionary design engineering change product design design change NC machine tools servo feeds machine tool design. 2012-02-04T23:20:50-05:00 4 3 220 243 2012-02-04T23:20:50-05:00 http://www.inderscience.com/link.php?id=45278 The present work investigates the mechanism of damping in layered and jointed bolted structures of aluminium, copper and mild steel materials with non-uniform intensity of pressure distribution at the interfaces. Extensive experiments are conducted to validate the numerical analysis. The interface pressure, diameter of the bolts, material, coefficient of friction and dynamic slip ratio at the interfaces, washer, and frequency of excitation are found to play major roles on the damping capacity of structures. It is established that the damping capacity of bolted structures can be enhanced substantially with an increase in number of layers and decrease in diameter of the bolts along with use of washers. It is further found that the aluminium material in layers contribute more to the damping of structures and this design concept can be effectively used to select a proper material depending on the required damping capacity in real industrial applications. Damping capacity of various materials with non-uniform intensity of pressure distribution at the interfaces of a layered and jointed structure
Bijoy Kumar Nanda
International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 244 - 268
The present work investigates the mechanism of damping in layered and jointed bolted structures of aluminium, copper and mild steel materials with non-uniform intensity of pressure distribution at the interfaces. Extensive experiments are conducted to validate the numerical analysis. The interface pressure, diameter of the bolts, material, coefficient of friction and dynamic slip ratio at the interfaces, washer, and frequency of excitation are found to play major roles on the damping capacity of structures. It is established that the damping capacity of bolted structures can be enhanced substantially with an increase in number of layers and decrease in diameter of the bolts along with use of washers. It is further found that the aluminium material in layers contribute more to the damping of structures and this design concept can be effectively used to select a proper material depending on the required damping capacity in real industrial applications.

]]> 10.1504/IJDE.2011.045278 International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 244 - 268 Bijoy Kumar Nanda Department of Mechanical Engineering, National Institute of Technology, Rourkela-769008, Orissa, India design engineering mechanical design cantilever beams damping capacity dynamic slip ratio energy dissipation free vibration kinematic coefficient of friction joints materials static bending stiffness aluminium copper mild steel pressure distribution. 2012-02-04T23:20:50-05:00 4 3 244 268 2012-02-04T23:20:50-05:00 http://www.inderscience.com/link.php?id=45277 Estimating damping in structures made of different materials is one of the biggest challenges in the field of structural dynamics. Significant weight savings and good mechanical as well as damping properties can make aluminium a potential material for most of the engineering applications especially in aerospace, automotive and manufacturing industries. This paper summarises the effect of thickness ratio on the mechanism of slip damping in jointed aluminium cantilever beams with riveted joints. The solution considers one-dimensional dynamic analysis using the finite element approach for the Euler-Bernoulli beam model. The cubic shape functions are considered for the transverse vibration of the beam in terms of nodal variables. Experiments are conducted for validating the numerical results. The results establish that the damping in jointed beams of lower thickness ratio can be appreciably improved using larger cantilever length and rivet diameter. Effect of thickness ratio on the slip damping of jointed aluminium cantilever beams
R.C. Mohanty; B.K. Nanda
International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 269 - 290
Estimating damping in structures made of different materials is one of the biggest challenges in the field of structural dynamics. Significant weight savings and good mechanical as well as damping properties can make aluminium a potential material for most of the engineering applications especially in aerospace, automotive and manufacturing industries. This paper summarises the effect of thickness ratio on the mechanism of slip damping in jointed aluminium cantilever beams with riveted joints. The solution considers one-dimensional dynamic analysis using the finite element approach for the Euler-Bernoulli beam model. The cubic shape functions are considered for the transverse vibration of the beam in terms of nodal variables. Experiments are conducted for validating the numerical results. The results establish that the damping in jointed beams of lower thickness ratio can be appreciably improved using larger cantilever length and rivet diameter.

]]> 10.1504/IJDE.2011.045277 International Journal of Design Engineering, Vol. 4, No. 3 (2011) pp. 269 - 290 R.C. Mohanty; B.K. Nanda Department of Mechanical Engineering, National Institute of Technology, Rourkela-769008, Orissa, India. ' Department of Mechanical Engineering, National Institute of Technology, Rourkela-769008, Orissa, India joints cantilever beams free vibration micro-slip interface pressure energy dissipation slip damping nodal displacement shape function mass stiffness matrix structural dynamics aluminium beams jointed beams thickness ratio finite element analysis FEA modelling cantilever length rivet diameter. 2012-02-04T23:20:50-05:00 4 3 269 290 2012-02-04T23:20:50-05:00