1999 Cilt 5 Sayı 1

Permanent URI for this collectionhttps://hdl.handle.net/11452/17005

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    A refrigerated road transport application
    (Uludağ Üniversitesi, 1999) Horuz, İlhamı; Mühendislik Mimarlık Fakültesi; Makine Mühendisliği Bölümü
    The study included an investigation into the use of Vapour Absorption Refrigeration (VAR) systems in road transport vehicles using the waste heat in the exhaust gases of the main propulsion unit as the energy source. This would provide an alternative to the conventional Vapour Compressian Refrigeration (VCR) system and its associated Internal Combustion (IC) Engine. The proposed system is almost maintenance free, having only one component, the solution pump, with moving parts. Additionally, the VAR system runs quietly and primary fuel energy used to drive the independent engine of the VCR system will be saved. There should also be savings in capital costs with the exclusion of the IC engine and the compressor of the conventional system. The effect on the main propulsion unit of inserting the VAR system into the exhaust system and how cooling can be provided during off-road/slow running conditions are also included in the studies.
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    Multi-pass metal-cutting optimization, part 2: With dynamic programming approach
    (Uludağ Üniversitesi, 1999) Öztürk, Ferruh; Mühendislik Mimarlık Fakültesi
    This paper describes an algorithm based on the dynamic programming approach for metal-cutting machining variables optimization. The multistage optimisation principles of dynamic programming are used to so/ve the cost function for multi-pass metal cutting operations. The proposed algorithm will be integrated into CNC tool path simulation program which is developed for TOFAŞ automotive factory.
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    The role of sampling in estimating the parameters of cisoids
    (Uludağ Üniversitesi, 1999) Dilaveroğlu, Erdoğan; Mühendislik Mimarlık Fakültesi; Elektronik Mühendisliği Bölümü
    For a single complex sinusoid (cisoid) in complex white Gaussian noise the dependence of the Cramer-Rao (C-R) bounds on the first sampling time is known. In this paper the fırst-sampling-time dependence of the bounds is examined for the two cisoid case. For two cisoids in complex white Gaussian noise it is shown that the largesı and the smallest values of the C-R frequency and amplitude bounds do not depend on the firsı sampling time and that the critica) values of the C-R phase bounds are smallesı when the sampling times are symmetrical.
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    Single pass metal-cutting optimization, part 1:with geometric programming approach
    (Uludağ Üniversitesi, 1999) Öztürk, Ferruh; Mühendislik Mimarlık Fakültesi; Makine Bölümü
    This paper presents an algorithm based on the geometric programming approach for metal-cutting machining variables optimization. The approach is applied for single-pass operations. The cost is the objective minimization function and subject to machining constraints such as machine power, surface finish qualities, ete. The proposed algorithm will be integrated into CNC tool path simulation program which is developed for TOFAŞ automotive factory.