scholarly journals Increasing frequency stability of HF signals in the transmitting device of the localiser based on statistical estimation of phases

2020 ◽  
Vol 23 (5) ◽  
pp. 19-28
Author(s):  
D. D. Gabrielyan ◽  
P. I. Kostenko ◽  
O. A. Safaryan
Keyword(s):  
Phase Synchronization ◽  
Average Frequency ◽  
Frequency Stability ◽  
Frequency Stabilization ◽  
Parameters Estimation ◽  
Least Square ◽  
Frequency Variation ◽  
Measurement Interval ◽  
Average Value ◽  
Statistical Frequency

The article based on the method of statistical frequency stabilization deals with the issues of increasing frequency stability and synchronization of the forming HF signals in a transmitting device of a localizer using a multichannel variant of construction. It was demonstrated that the available digital unit of frequency and phase correction allows easy application of the proposed method. Two main features of the localizer operation affecting frequency stability and phase synchronization of HF signals are noted. The first factor is determined by deviation of the present -HF signal frequency (on the measurement interval) from the average (i) frequency value in n-channel. The second one is related to average frequency variation of each of the forming HF signals and its deviation within the (i) value from the nominal value during localizer operation. On the basis of HF signals description in channels of the transmitting device of a localizer ratios are obtained determining optimal values in terms of the method of least square method as (i) deviations of the present frequency values from the average value as well as variations of average frequency values during localizer operation. The article considers the most significant, from an applicatory point of view, case of assessment covering only deviations of the present HF signals frequency values from the average value on the measurement interval. It is shown that application of the method of statistical frequency stabilization allows the transmitting device of a localizer including N channels of HF signals formation to increase frequency stability and HF signals phase synchronization times. That enables to improve accuracy of forming integrated and difference directivity diagrams and setting heading in the runway direction as well. Apart from that, on the basis of the received values of frequency parameters estimation and relative instability of the forming HF signals a decision can be made about the condition of the controlled parameter by the criterion STANDARD-DETERIORATION-ACCIDENT.

scholarly journals ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI IMPLEMENTASI ANGGARAN BERBASIS KINERJA

2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Kaillin Lalli Randa ◽  
Ida Ayu Purba Riani ◽  
Balthazar Kreuta
Keyword(s):  
Data Analysis ◽  
Organizational Commitment ◽  
Positive Influence ◽  
Least Square ◽  
Ordinary Least Square ◽  
Average Value ◽  
Data Analysis Technique ◽  
Analysis Technique ◽  
Partial Analysis ◽  
The Mean

The purpose of the study was to analyze what factors influence the Performance Based Budget by using a sample of 87 respondents working at the Secretariat of the Papuan People's Representative Council. While the data analysis technique used is the Ordinary least square (OLS) technique. The results of the study are indicated by the calculation of the mean (mean) of 32 item questions and 87 respondents and the result is 137.31. If the value is compared to the criteria that the author has set, then the average value is included in the "Very Good" category. While the results of the partial analysis of organizational commitment (X1) have a significant and positive influence on the performance-based budget of 1,261. Keywords: Performance Based Budget

scholarly journals ANALISIS STUKTUR, KINERJA, DAN PERILAKU INDUSTRI ROKOK KRETEK DAN ROKOK PUTIH DI INDONESIA PERIODE 1991-2008

2013 ◽  
Vol 1 (1) ◽  
pp. 59
Author(s):  
Gustyanita Pratiwi ◽  
Lukytawati Anggraeni
Keyword(s):  
Government Regulation ◽  
Manufacturing Industry ◽  
Variable Number ◽  
Least Square ◽  
Production Costs ◽  
Significant Variable ◽  
Selling Price ◽  
Barriers To Entry ◽  
Average Value ◽  
Cigarette Industry

<em>Tobacco industry is one of important manufacturing industry in Indonesia. There are several changes in structure, performance, and behavior of this industry during 1991-2008. This study aim is to analyze the differences between clove cigarette and white cigarette industries with SCP method. Analysis of industrial structure with CR4 index and barriers to entry. Industry performance is measured by Price Cost Margin (PCM) approach. Factors that affect the performance itself are analyzed by the Ordinary Least Square (OLS) method. The results of structural analysis show that the level of industry concentration of clove cigarettes went from tight oligopoly (84.29 percent) to medium oligopoly (52.65 percent) during research period. In contrast, white cigarette industry remained in tight oligopoly level with an average value of CR4 about 94.33 percent. The average value of MES which reflects the barrier to entry in white cigarette industries is higher (95.17 percent) than in cigarette industries (72.85 percent). Regression analysis on a clove cigarette industry indicates that the variable X-eff and growth are significantly positive, whereas a variable number of firms significantly negative effect on PCM. In white cigarette industry, a significant variable to the PCM is the X-eff  (0.366799). The analysis of behavior between the two industries cannot be separated from government regulation, especially in setting of the selling price. Promotion, although it increasing production costs, remains to be important strategy to maintain the industry market share.</em>

scholarly journals Vibration Parameters Estimation by Blade Tip-Timing in Mistuned Bladed Disks in Presence of Close Resonances

2020 ◽  
Vol 10 (17) ◽  
pp. 5930
Author(s):  
Saeed Bornassi ◽  
Christian Maria Firrone ◽  
Teresa Maria Berruti
Keyword(s):  
Frequency Response ◽  
Optimization Technique ◽  
Numerical Test ◽  
Parameters Estimation ◽  
Least Square ◽  
Response Curves ◽  
Bladed Disks ◽  
Bladed Disk ◽  
Resonance Frequencies ◽  
Blade Tip

The present paper is focused on the post processing of the data coming from the Blade Tip-Timing (BTT) sensors in the case where two very close peaks are present in the frequency response of the vibrating system. This type of dynamic response with two very close peaks can occur quite often in bladed disks. It is related to the fact that the bladed disk is not perfectly cyclic symmetric and the so called “mistuning” is present. A method based on the fitting of the BTT sensors data by means of a 2 degrees of freedom (2DOF) dynamic model is proposed. Nonlinear least square optimization technique is employed for identification of the vibration characteristics. A numerical test case based on a lump parameter model of a bladed disk assembly is used to simulate different response curves and the corresponding sensors signals. The Frequency Response Function (FRF) constructed at the resonance region is compared with the traditional Sine fitting results, the resonance frequencies and damping values estimated by the fitting procedure are also reported. Accurate predictions are achieved and the results demonstrate the considerable capacity of the 2DOF method to be used as a standalone or as a complement to the standard Sine fitting method.

EVALUATION OF ELECTROMAGNETICS RADIATION FOR STROKE PATIENTS AND NON-STROKE PARTICIPANTS ACCORDING TO BODY SEGMENTATION

2016 ◽  
Vol 78 (6-3) ◽  
Author(s):  
R.S.S.A. Kadir ◽  
Zunairah Hj Murat ◽  
M.N. Taib ◽  
Siti Zura A. Jalil
Keyword(s):  
Human Body ◽  
Average Frequency ◽  
Dipole Antenna ◽  
The Body ◽  
Stroke Patients ◽  
Stroke Treatment ◽  
Average Value ◽  
Body Segmentation ◽  
The Right ◽  
Frequency Detector

This research evaluates the electromagnetic radiation (EMR) for the stroke patients and non-stroke patients according to body segmentation. The human body is divided into three segments: top, middle and bottom. The frequency in hertz is collected at 23 points around the human body namely left side, right side and chakra points from 199 subjects undergoing post-stroke treatment and 100 non-stroke participants. The EMR is captured using frequency detector equipped with a dipole antenna. The data is collected by taking the reading of the frequency 5 times at each point at the same location; hence, the average value is calculated. The statistical analysis of the EMR are examined using SPSS software and Microsoft excel is used to calculate the average frequency of the data. In conclusion, the findings significantly shows that stroke patients has lower frequency value of EMR for both right side and left side but has higher frequency for chakra system. This is true for all the three segments of the body. Furthermore, it is also  shown that there is no correlation between the left and the right side frequency for the stroke patients whereas the left-right correlation values are significantly high for the non-stroke participants. This observation justify that EMR from human body can contribute to early detection for stroke.

scholarly journals Modeling technology of curved surface development for puffer fish

2020 ◽  
Vol 12 (4) ◽  
pp. 168781402091602
Author(s):  
Honggen Zhou ◽  
Jie Cui ◽  
Guizhong Tian ◽  
Yesheng Zhu ◽  
Changfeng Jia
Keyword(s):  
Three Dimensional ◽  
Least Square ◽  
Curved Surface ◽  
B Spline ◽  
Implicit Equation ◽  
Moving Least Square ◽  
Average Value ◽  
Modeling Technology ◽  
Surface Development ◽  
Puffer Fish

The drag reduction mechanism of puffer epidermis was closely related to its real geometry. In order to solve the modeling problem of epidermal spines on the puffer surface, a modeling method for the expansion of puffer shape was proposed. The three-dimensional scanning and non-uniform rational B-spline surface modeling technology was used to reconstruct the puffer model. According to the curvature characteristics, the surface mathematical equations including exponential, logarithmic, and sinusoidal functions were established based on the multinomial function. The surface was generated by a mathematical equation, and the surface was divided into several non-uniform rational B-spline patches according to curvature. After discretization, the point cloud Gaussian curvature and average value were calculated based on the implicit equation of moving least square surface, and whether the surface is approximately extensible or not was judged. Finally, the puffer surface was divided into 46 curved patches. In this article, the surface expansion algorithm gave priority to ensure the area unchanged, and four feature surfaces were selected according to the epidermal spines arrangement of the puffer surface. The results showed that the technique can simply and efficiently unfold the curved surface of the puffer fish, thus the mapping relationship between the epidermal spines on the surface and the plane was determined, which established a foundation for the accurate arrangement and modeling of the epidermal spines on the surface.

scholarly journals Windowed Least Square Algorithm Based PMSM Parameters Estimation

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Song Wang
Keyword(s):  
Embedded System ◽  
Window Size ◽  
Parameters Estimation ◽  
Least Square ◽  
Time Varying ◽  
Recursive Least Square ◽  
Permanent Magnet Synchronous Motors ◽  
Practical Applications ◽  
Controlling System ◽  
System Resource

Stator resistance and inductances ind-axis andq-axis of permanent magnet synchronous motors (PMSMs) are important parameters. Acquiring these accurate parameters is usually the fundamental part in driving and controlling system design, to guarantee the performance of driver and controller. In this paper, we adopt a novel windowed least algorithm (WLS) to estimate the parameters with fixed value or the parameter with time varying characteristic. The simulation results indicate that the WLS algorithm has a better performance in fixed parameters estimation and parameters with time varying characteristic identification than the recursive least square (RLS) and extended Kalman filter (EKF). It is suitable for engineering realization in embedded system due to its rapidity, less system resource possession, less computation, and flexibility to adjust the window size according to the practical applications.

scholarly journals Frequency stability of a wavelength meter and applications to laser frequency stabilization

2015 ◽  
Vol 54 (32) ◽  
pp. 9446 ◽  
Author(s):  
Khaldoun Saleh ◽  
Jacques Millo ◽  
Alexandre Didier ◽  
Yann Kersalé ◽  
Clément Lacroûte
Keyword(s):  
Laser Frequency ◽  
Frequency Stability ◽  
Frequency Stabilization ◽  
Laser Frequency Stabilization

scholarly journals Satellite Attitude Control System Simulator

2008 ◽  
Vol 15 (3-4) ◽  
pp. 395-402 ◽  
Author(s):  
G.T. Conti ◽  
L.C.G. Souza
Keyword(s):  
Control System ◽  
Experimental Verification ◽  
Attitude Control ◽  
Parameters Estimation ◽  
Least Square ◽  
Control Algorithms ◽  
Attitude Control System ◽  
Recursive Methods ◽  
Satellite Attitude ◽  
Satellite Attitude Control

Future space missions will involve satellites with great autonomy and stringent pointing precision, requiring of the Attitude Control Systems (ACS) with better performance than before, which is function of the control algorithms implemented on board computers. The difficulties for developing experimental ACS test is to obtain zero gravity and torque free conditions similar to the SCA operate in space. However, prototypes for control algorithms experimental verification are fundamental for space mission success. This paper presents the parameters estimation such as inertia matrix and position of mass centre of a Satellite Attitude Control System Simulator (SACSS), using algorithms based on least square regression and least square recursive methods. Simulations have shown that both methods have estimated the system parameters with small error. However, the least square recursive methods have performance more adequate for the SACSS objectives. The SACSS platform model will be used to do experimental verification of fundamental aspects of the satellite attitude dynamics and design of different attitude control algorithm.

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