Resistance spot welding (RSW) was used to weld Mg alloy AZ61A. To research weldability of this alloy many welding parameters, e.g. current, time, pressure, have been tried in wide range on the welding source DALEX PMS 11 – 4. Visual check was followed with metallography, tensile test etc. Some defects as solidification, liquation cracks, porosity were found. The creation of imperfections was found to be (…)
The paper deals with partial verification of mechanical properties (through waveform measurements hardness HV10) obtained after SAW multi-pass welding in "ultra" narrow gap. Simulated homogenous welds of high pressure (HP) turbine rotors (30CrMoNiV5-11) formed with various types of filler materials (TOPCORE 838 B Thermanit MTS 616) using the same temperature cycle and subsequent heat treatment were test (…)
Water injection is a means of internal cooling of the engine. During combustion, excess temperatures generated are absorbed by water as latent heat. Optimum water injection quantities were found to be about 0.015 ml to 0.031 ml of water per cycle on a 592 cc SI engine. The experiments were carried out by tapping the fuel injector signal and designing a circuit to inject water at the instant petrol is in (…)
This paper deals with collision avoidance for road vehicles when operating at the limits of available friction. For collision avoidance, a typical control approach is to: (a) define a reference geometric path that avoids collision; (b) apply low-level control to perform path following. However, there are a number of limitations in this approach, which are addressed in the current paper. First, it is typ (…)
We present a methodology to assess the design of ther-moelectric Energy Harvesting Systems (EHS) from exhaust gas pipes. In this application, thermoelectric generators (TEGs) are used to generate electricity using a temperature difference, based on the Seebeck Effect. The hot side temperature is given bythe waste heat in theexhaust gasof an oil-fired heating system and, at the cold TEG side, two differe (…)
In the paper is presented a comparison of three method of back electromotive force estimation. Presented structures: the observers and the simulator, are utilized to estimate the back electromotive force for speed range below single revolution per second. Theirs instantaneous values are used then to calculate the shaft position of the permanent magnets synchronous motor. Performance of such structures i (…)
The thermal analysis is necessary in design process of new electric motor. During motor design process is necessary to know temperatures of induction motor’s (IM’s) construction parts. The calculated temperatures in all motor parts should be lower than critical temperatures. This paper deals with free-dimensional (3D) transient thermal analysis of small squirrel cage motor/induction motor. The design of (…)
The world has a bottomless appetite for electricity. Much of this electricity is used to power electric motors. Thanks to that electric motors represent a huge potential for energy savings. Synchronous reluctance machines are promising electric machines for energy savings. Key to success of synchronous reluctance machines is laying in elimination of rotor losses. This article deals with the design of sy (…)
This work presents the study of active vibration control for a FPSE/LA engine to ensure a reliable engine operation within a broader range of operation frequencies [50 ± 3 Hz] complying with new regulations. An ATMD is discussed as a potential solution for increasing the operational envelope from original frequency requirements of [50 ± 0.5 Hz] to the new range while maintaining vibration amplitudes bel (…)
This paper is an experimental study of the system for support the design and optimization of reconfigurable manufacturing systems (RMS), which contains from the basic components of the proposed solution. Individual parts communicate with each other and exchange information which is necessary for implement required tasks. In addition, this paper also investigates the reconfigurable manufacturing systems, (…)
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