the usage of turbochargers in diesel engines has led to the downsizing of the motors as well as usage of the waste gates in turbochargers. any dimensional reduction in turbochargers and appurtenant leads to an enhancement on the performance of internal combustion engines and in environmental problems in terms of aerodynamic, thermodynamic and mechanical specifications for both engines and turbo...

This paper demonstrates a typical process to investigate the vibro-acoustic behavior of R410A rotary compressors. The compressor shell is usually the main noise radiator in a rotary compressor. However, the accumulator shell can be a significant noise source as well, although its size is relatively small. Sound performance of a rotary compressor is affected not only by the dynamic characteristi...

A dynamic model of a centrifugal compressor capable of system simulation in the virtual test bed (VTB) computational environment is presented. The model is based on first principles, i.e. the dynamic performance including the losses is determined from the compressor geometry and not from the experimentally determined characteristic performance curves. In this study, the compressor losses, such ...

—In this paper, we demonstrate the higher hardware ef ciency of Reed-Solomon (RS) parallel turbo decoding compared with BCH parallel turbo decoding. Based on an innovative architecture, this is the rst implementation of fully parallel RS turbo decoder. A performance analysis is performed showing that RS Block Turbo Codes (RS-BTC) have decoding performance equivalent to Bose Ray-Chaudhuri Hocque...

Turbo equalizers have been shown to be successful in mitigating the effects of inter-symbol interference introduced by partial response modems and by dispersive channels for code rates of 1 2. In this contribution, we comparatively studied the performance of a range of binary phase-shift keying turbo equalizers employing block-turbo codes, namely Bose–Chaudhuri–Hocquenghen turbo codes, convolut...

We determine the asymptotically optimal compressor function for a multidimen-sional compander when the source is memoryless. Under certain technical assumptions on the compressor function, it is shown that the best k-dimensional compressor function consists of the best scalar compressor functions for each component of the source vector. The mean-squared error of optimal multidimensional compand...

Infrared wireless communication and optical communication usually adopt on-off keying (OOK) and pulse position modulation (PPM). In [1] we presented the iterative maximum a posteriori probability (MAP) decoding of Turbo coded OOK and Turbo coded binary PPM (BPPM). In this paper, we present a soft-output Viterbi algorithm (SOVA) based iterative decoding of Turbo coded OOK and Turbo coded BPPM. W...

Basically, conventional single-carrier system has an advantage in limited power communication systems. However, the performance of conventional single-carrier system is seriously degraded by ISI (inter-symbol interference). In order to overcome the ISI, communication systems are commonly used an equalizer. Turbo equalization technique was proposed to maximize system performance over ISI channel...

In this paper we don't examine security of Turbo SHA-2 completely; we only show new collision attacks on it, with smaller complexity than it was considered by Turbo SHA-2 authors. In [1] they consider Turbo SHA-224/256r and Turbo SHA-384/512-r with variable number of rounds r from 1 to 8. The authors of [1] show collision attack on Turbo SHA-256-1 with one round which has the complexity of 2. F...

This paper presents how we improved the efficiency in rotary compressor. At first, we made effort to estimate the power losses in the compressor, to analyze the operating conditions of the bearing and to calculate the performance of the compressor. Next, the temperature in housing and pressure in cylinder were measured in real compressors in order to obtain the data on the internal conditions o...