The Experts below are selected from a list of 546 Experts worldwide ranked by ideXlab platform
W Modrzycki - One of the best experts on this subject based on the ideXlab platform.
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High speed precise machine tools spindle units improving
2015Co-Authors: J. J Drzejewski, Z Kowal, W ModrzyckiAbstract:Abstract: A hybrid high-speed precise machining centre Headstock model based on two computation methods: the finite element method and the finite difference method is presented. The model allows one to calculate precisely the Headstock’s indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. The bearing units and cooling system influence on machine tool preciseness has been described
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high speed precise machine tools spindle units improving
Journal of Materials Processing Technology, 2005Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed precise machining centre Headstock model based on two computation methods: the finite element method (FEM) and the finite difference method (FDM) is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centres Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model. The bearing units and cooling system influence on machine tool preciseness has been described.
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hybrid model of high speed machining centre Headstock
CIRP Annals, 2004Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed machining centre Headstock model based on two computation methods: the finite element method and the finite difference method is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centre Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model.
Jhy-cherng Tsai - One of the best experts on this subject based on the ideXlab platform.
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Optimum design of Headstocks of precision lathes
International Journal of Machine Tools and Manufacture, 1999Co-Authors: Ting-yu Chen, Wei Jiunn Wei, Jhy-cherng TsaiAbstract:The optimum designs of Headstocks of precision lathes are studied. Three different outer shapes of Headstocks are explored. Thermal deformations due to heat generated by spindle bearings are considered. The objective is to minimise the overall deflection of the workpiece at the cutting point. The constraint is to force the fundamental natural frequency much greater than the working frequency in order to reduce dynamic deflections. The design variables include the shape dimensions, the locations of the spindle bearings, the stiffnesses of the spindle bearings, the dimensions of the fins and the locations of the fins. The genetic algorithm is utilised to solve these mixed-variable optimisation problems. Optimum solutions for the three different types of Headstocks are found and discussed.
Fenwick John - One of the best experts on this subject based on the ideXlab platform.
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Decision support in using fibre reinforced polymer (FRP) composites in rehabilitation of concrete bridge structures
CRC for Construction Innovation, 2004Co-Authors: Nezamian Abe, Setunge Sujeeva, Kumar Arun, Fenwick JohnAbstract:This paper compares and reviews the recommendations and contents of the guide for the\ud design and construction of externally bonded FRP systems for strengthening concrete structures reported\ud by ACI committee 440 and technical report of Externally bonded FRP reinforcement for RC structures (FIB\ud 14) in application of carbon fiber reinforced polymer (CFRP) composites in strengthening of an aging\ud reinforced concrete Headstock. The paper also discusses the background, limitations, strengthening for\ud flexure and shear, and other related issues in use of FRP for strengthening of a typical reinforced concrete\ud Headstock structure such as durability, de-bonding, strengthening limits, fire and environmental conditions.\ud A case study of strengthening of a bridge Headstock using FRP composites is presented as a worked\ud example in order to illustrate and compare the differences between these two design guidelines when\ud used in conjunction with the philosophy of the Austroads (1992) bridge design code
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Decision support in using fibre reinforced polymer (FRP) composites in rehabilitation of concrete structures
2004Co-Authors: Nezamian A., Setunge Sujeeva, Kumar Arun, Fenwick JohnAbstract:This paper compares and reviews the recommendations and contents of the guide for the design and construction of externally bonded FRP systems for strengthening concrete structures reported by ACI committee 440 and technical report of Externally bonded FRP reinforcement for RC structures (FIB 14) in application of carbon fiber reinforced polymer (CFRP) composites in strengthening of an aging reinforced concrete Headstock. The paper also discusses the background, limitations, strengthening for flexure and shear, and other related issues in use of FRP for strengthening of a typical reinforced concrete Headstock structure such as durability, de-bonding, strengthening limits, fire and environmental conditions. A case study of strengthening of a bridge Headstock using FRP composites is presented as a worked example in order to illustrate and compare the differences between these two design guidelines when used in conjunction with the philosophy of the Austroads (1992) bridge design code
Z Kowal - One of the best experts on this subject based on the ideXlab platform.
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High speed precise machine tools spindle units improving
2015Co-Authors: J. J Drzejewski, Z Kowal, W ModrzyckiAbstract:Abstract: A hybrid high-speed precise machining centre Headstock model based on two computation methods: the finite element method and the finite difference method is presented. The model allows one to calculate precisely the Headstock’s indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. The bearing units and cooling system influence on machine tool preciseness has been described
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high speed precise machine tools spindle units improving
Journal of Materials Processing Technology, 2005Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed precise machining centre Headstock model based on two computation methods: the finite element method (FEM) and the finite difference method (FDM) is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centres Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model. The bearing units and cooling system influence on machine tool preciseness has been described.
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hybrid model of high speed machining centre Headstock
CIRP Annals, 2004Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed machining centre Headstock model based on two computation methods: the finite element method and the finite difference method is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centre Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model.
Jerzy Jedrzejewski - One of the best experts on this subject based on the ideXlab platform.
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high speed precise machine tools spindle units improving
Journal of Materials Processing Technology, 2005Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed precise machining centre Headstock model based on two computation methods: the finite element method (FEM) and the finite difference method (FDM) is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centres Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model. The bearing units and cooling system influence on machine tool preciseness has been described.
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hybrid model of high speed machining centre Headstock
CIRP Annals, 2004Co-Authors: Jerzy Jedrzejewski, Z Kowal, W Kwaśny, W ModrzyckiAbstract:Abstract A hybrid high-speed machining centre Headstock model based on two computation methods: the finite element method and the finite difference method is presented. The model allows one to calculate precisely the Headstock's indices on the basis of which its optimal operating characteristics can be determined. The presented modelling methods allow one to evaluate a design from thermal, stiffness and durability points of view. By way of illustration, the behaviour of three machining centre Headstocks with: an electrospindle on rolling bearings, a conventional spindle and an electrospindle on aerostatic bearings are modelled using the hybrid model.
