Pulse-width modulated (PWM) adjustable frequency drives (AFDs) are extensively used in industries for control of induction motors. It has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. Hence, overshoots, high rate of rise, harmonics and transients are observed in the voltage wave. They increase voltag...

Thermal Contact Conductance (TCC) between an exhaust valve and its seat is one of the important parameters to be estimated in an internal combustion engine. An experimental study presented here to acquire temperature in some interior points to be used as inputs to an inverse analysis. An actual exhaust valve and its seat are utilized in a designed and constructed setup. Conjugate Gradient Metho...

A further optimisation of adaptive subspace-based frequency estimation for multiple real valued sine waves is considered in this paper. Authors proposed in [10] a novel combination of strong adaptive covariance matrix update and optimised block processing for frequency values retrieval. The new optimised approach combines the projection approximation subspace tracking technique based on deflati...

The parameter estimation of the frequency agility (FA) signal using the coding Nyquist folding receiver (CNYFR) is presented. The estimation algorithm adopting linear frequency modulation (LFM) as the local analogue modulation is derived. The Nyquist zone is estimated by the pseudo Wigner-Ville distribution (PWVD) and the hopping frequencies are calculated by the maximum likelihood (ML) method....

Streaming video quality dependents in part upon the video encoding process. The Frequency Domain Motion Estimation process is commonly used to accelerate the entire video encoding process. It is used to reduce the encoding time by increasing the Motion Estimation Time Saving. The Combinational-Discrete Cosine Transform consumes most of the time of the Frequency Domain Motion Estimation video en...

Author: Trond Mannseth Affiliation: RF-Rogaland Research Title: NONLINEARITY, SCALE, AND SENSITIVITY FOR PARAMETER ESTIMATION PROBLEMS; SOME IMPLICATIONS FOR ESTIMATION ALGORITHMS Text: Parameter estimation algorithms that rely on sensitivity information to calculate new parameter updates, are usually based on a linearization of the model function at the current parameter estimate. Hence, both ...

Uncertainty assessment for parameter estimation problems is considered. It is customary to use confidence regions or intervals to give the precision of the parameter estimates. The method most used, because of modest computational requirements, is linearized covariance analysis. Monte Carlo analysis can be used to check the validity of the linearization for a particular model, but is clearly no...

Abstract When processing wide sense stationary (WSS) signals, the sampled data rate of conventional MN bands DFT filter bank is at least MN, while co-prime (co-prime DFTFB) only needs M+N, that sharply lowers sampling rate. Here, M and N are pair integers. However, practical FIR imperfections correlation detection mode arouse spurious peaks in signal power spectrogram, greatly limits applicatio...

Abstract— The bit error rate (BER) performance of DS-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. Accurate estimation of the channel transfer function and the signal-to-noise power ratio (SNR) are necessary for MMSE-FDE. Direct application of pilot-assisted channe...