In this paper, a new algorithm for system identification based on frequency response is presented. In this method, given a set of magnitudes and phases of the system transfer function in a set of discrete frequencies, a system of linear equations is derived which has a unique and exact solution for the coefficients of the transfer function provided that the data is noise-free and the degrees of...

a frequency domain dynamic analysis is needed to obtain the response of structures constructed on a system of base isolators on flexible soil when subjected to earthquake ground motion. in such systems, the lateral stiffness of the base isolators is so small, compared to the structural stiffness, that in an earthquake attack the fundamental vibration mode dominates the response. with this in mi...

the modulation response, relative intensity noise and frequency noise characteristics of qd lasers are investigated theoretically, in presence of an additional optical pumping. it is revealed that the modulation response of qd laser enhances under additional optical beam. by small signal analysis of the carriers' and photons' rates, it is proposed that by injecting excess carriers to ...

This study examined constraints and adoption in poultry production in the Northern Agricultural Zone of Delta State, Nigeria. A sample size of 80 respondents comprising of Supervisors of selected farms was used for the study. Data were collected through the use of a structured and validated questionnaire. Data were collected in March 2017. Descriptive statistics such as frequency count, mean sc...

To improve the primary frequency response in future low-inertia hybrid power system a fuzzylogic based frequency controller (FFC) for wind farms augmented with energy storage systems(wind-storage system) and intelligent PV farms for the frequency stabilization is proposed inthis paper. Using system frequency deviations the proposed controller provides bidirectionalreal p...

In this paper, a new algorithm with multi constraints that can be used in active noise control is presented. This can be used to maintain the particular system power budget and prevent over driving. The filter used for the constraints is frequency domain of least mean square algorithm. A limiting factor is used in the algorithm to reduce the effect of the filter response at other frequencies. T...

An optimization technique for designing cosine-modulated filter banks using the frequency-response masking approach is proposed. In the given method, we perform minimization in the least-squares and minimax senses, subject to direct and aliasing transfer-function constraints. For optimization, a quasi-Newton algorithm with line search is used, based on sequential quadratic programming. Simplifi...

Controlling the frequency response of an engineering component or structure is important in aerospace and automotive sectors a key consideration when seeking new more efficient design for given component. In this contribution, standard truss layout optimization procedure modified to incorporate semidefinite constraints limit minimum value first natural frequency. Since increases computational e...

Complete row and column symmetry breaking in constraint models using the lex leader method is generally prohibitively costly. Double lex, which is derived from lex leader, is commonly used in practice as an incomplete symmetrybreaking method for row and column symmetries. Double lex is based on a rowwise canonical variable ordering. However, this choice is arbitrary. We investigate other canoni...

This article contrasts aphasic patients' performance of word naming and lexical decision with that of intact college-aged readers. We discuss this contrast within a framework of self-organization; word recognition by aphasic patients is destabilized relative to intact performance. Less stable performance shows itself as an increase in the dispersion of patients' response times compared to colle...