scholarly journals Выставка многопозиционной маячной системы на основе траекторных измерений

2020 ◽  
Author(s):  
A.S. Devyatisilnyi ◽  
V.M. Grinyak ◽  
A.V. Shurygin ◽  
Y.S. Ivanenko
Keyword(s):  
Measurement Errors ◽  
Dead Reckoning ◽  
Simulation Models ◽  
Point Of View ◽  
Observation System ◽  
Continuous Type ◽  
Mobile Objects ◽  
Finite Dimensional ◽  
State Measurement ◽  
The Mathematical Model

Рассматривается проблема построения маячной дальномерной системы наблюдения. В статье обсуждается постановка и подходы к решению двухкоординатной задачи выставки (местной координатной привязки) многопозиционной маячной системы, предназначенной для наблюдения подвижных объектов различного целевого назначения (подводных, надводных, наземных, воздушных и др.). Такого рода системы актуальны как для традиционных сфер решения навигационных задач, так и для задач наблюдения нового типа, например, навигация мобильных устройств в статье моделируется гидроакустическая маячная система, предназначенная для позиционирования подводных аппаратов. Сформулирована математическая модель задачи выставки, основанная на уравнениях типа состояние-измерение и конечномерных представлениях метода наименьших квадратов. В силу исходной нелинейности задачи предлагается её линеаризация около некоторого опорного решения, характеризующего априорные представления о состоянии системы наблюдения. Особое внимание в статье уделено вопросу разрешимости задачи в трёх аспектах: принципиальной разрешимости (наблюдаемости), разрешимости в условиях инструментальных погрешностей измерений, разрешимости в условиях конечной точности вычислений. Первый аспект разрешимости интерпретируется полнотой ранга соответствующей системы линейных алгебраических уравнений, второй и третий обусловленностью задачи и сходимостью итерационной процедуры оценивания. Приведены результаты численного моделирования для типичных ситуаций. Показано, что могут быть достигнуты точности выставки, достаточные для качественного решения широкого круга навигационных задач.Current paper is about problem observation system based on range measurer. The paper discusses the formulation and approaches to the solution of the two-coordinate task of the adjustment (local coordinate binding) of a multi-position system intended for monitoring mobile objects for various special purposes (underwater, surface, air, etc.). The problem of refining the configuration and spatial orientation for a multiposition observing system during a correction of the solution of a navigation problem by the dead reckoning method is considered. The mathematical model of the exhibition problem based on equations of the state-measurement type of continuous type and finite-dimensional representations of the method of least squares is formulated. Attention is paid to the problem of resolvability of the problem from the point of view fundamental resolvability (observability) and resolvability under instrumental measurement errors and finite accuracy of machine computations. The question of solvability is discussed. The results of a numerical experiment with the use of simulation models are presented. These results adequately illustrate the possibility of an efficient solution of the problem.

Over Voltage Protection Device Based on Multi-Strategy

2011 ◽  
Vol 464 ◽  
pp. 53-56
Author(s):  
Hai Tao Zhang ◽  
Gang Li
Keyword(s):  
Electromagnetic Interference ◽  
Measurement Errors ◽  
Fuzzy Neural Network ◽  
Single Point ◽  
Protection Device ◽  
Fuzzy Neural ◽  
Single Strategy ◽  
Sensor Monitoring ◽  
The Mathematical Model ◽  
Control Accuracy

Strong electromagnetic interference occurs when the locomotive was running. Therefore, measurement errors resulted from interference exist when monitoring the rail potential only at single point. This will lead to misoperation of the protection device. An over voltage protection device based on multipoint and multi-strategy was designed. The mathematical model of rail potential distribution was built. Fuzzy neural network and multi-sensor monitoring technology were applied in this design. The emulation analysis demonstrated that the proposed device has better reliability and higher control accuracy than the single strategy approach.

scholarly journals Smartphone Location Recognition: A Deep Learning-Based Approach

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 214 ◽  
Author(s):  
Itzik Klein
Keyword(s):  
Deep Learning ◽  
Sampling Rate ◽  
Dead Reckoning ◽  
Step Length ◽  
Point Of View ◽  
Learning Approaches ◽  
Location Recognition ◽  
Length Estimation ◽  
Recorded Data ◽  
Definition Of

One of the approaches for indoor positioning using smartphones is pedestrian dead reckoning. There, the user step length is estimated using empirical or biomechanical formulas. Such calculation was shown to be very sensitive to the smartphone location on the user. In addition, knowledge of the smartphone location can also help for direct step-length estimation and heading determination. In a wider point of view, smartphone location recognition is part of human activity recognition employed in many fields and applications, such as health monitoring. In this paper, we propose to use deep learning approaches to classify the smartphone location on the user, while walking, and require robustness in terms of the ability to cope with recordings that differ (in sampling rate, user dynamics, sensor type, and more) from those available in the train dataset. The contributions of the paper are: (1) Definition of the smartphone location recognition framework using accelerometers, gyroscopes, and deep learning; (2) examine the proposed approach on 107 people and 31 h of recorded data obtained from eight different datasets; and (3) enhanced algorithms for using only accelerometers for the classification process. The experimental results show that the smartphone location can be classified with high accuracy using only the smartphone’s accelerometers.

Tri-Generation Systems Optimization: Comparison of Heuristic and Mixed Integer Linear Programming Approaches

2014 ◽  
Author(s):  
Aldo Bischi ◽  
Stefano Campanari ◽  
Alberto Castiglioni ◽  
Giampaolo Manzolini ◽  
Emanuele Martelli ◽  
...  
Keyword(s):  
Linear Programming ◽  
Integer Linear Programming ◽  
Mixed Integer Linear Programming ◽  
Storage System ◽  
Simulation Models ◽  
Point Of View ◽  
Mixed Integer ◽  
Test Case ◽  
Optimization Strategy ◽  
Software Codes

This work compares two optimization approaches for combined cooling, heating and power (CCHP or Tri-generation) energy systems scheduling. Both approaches are developed through dedicated software codes and are based on simulation models capable of evaluating of the best operating strategy (both economically and energy-wise) to run a given trigeneration plant while dealing with time-variable loads and tariffs. The simultaneous use of different prime movers operating in parallel is taken into consideration as well as their part load performance, the influence of ambient temperature and the usage of a heat storage system. Cooling may be generated through absorption chillers or electrically driven compression cycles. One of the models is heuristic and adopts an optimization strategy based on a multi-step approach: it simulates several cases according to a pre-defined number of paths, exploring the most reasonable operational modes and comparing them systematically. The other relies on a mathematical approach, based on a Mixed Integer Linear Programming (MILP) optimization model which has been developed in order to deal with more complex systems without the need of predefining a too large variety of operation paths. Results of the two models are compared against a test case based on real plant specifications, discussing their performance by the point of view of simulation capabilities, quality and accuracy of the optimization results (in terms of differences in energy and economic performance) and computational resources.

The Properties of Two-Way Cartridge Valve in Water Hydraulic through Matlab/Simulink

2012 ◽  
Vol 271-272 ◽  
pp. 1073-1076
Author(s):  
Zhen Hua Duan ◽  
Zhang Yong Wu ◽  
Qing Hui Wang ◽  
Xi Wu ◽  
Cheng Zhuo Wen
Keyword(s):  
Mathematical Model ◽  
Simulation Analysis ◽  
Point Of View ◽  
Matlab Simulink ◽  
Practical Point ◽  
Structure Characteristics ◽  
Water Hydraulic ◽  
The Mathematical Model

According to the requirements of hydraulic transmission to two-way cartridge valve, and from the practical point of view a water hydraulic two-way cartridge valve was designed. Then its structure characteristics was introduced and the mathematical model was established. The simulation analysis of the water hydraulic two-way cartridge valve has been carried out through Matlab/Simulink proving that its structure was reasonable and it had good performances.

Prediction of Relative Motion and Probability of Contact Between FPSO and Shuttle Tanker in Tandem Offloading Operation

2002 ◽  
Author(s):  
Haibo Chen ◽  
Torgeir Moan ◽  
Sverre Haver ◽  
Kjell Larsen
Keyword(s):  
North Sea ◽  
Extreme Values ◽  
Simulation Models ◽  
Point Of View ◽  
Simulation Code ◽  
The North ◽  
Simulation Based ◽  
The North Sea ◽  
Sensitivity Studies ◽  
Tandem Offloading

Tandem offloading safety between FPSO and shuttle tanker is under concern. A few collisions between the two vessels have happened in the North Sea in recent years. In these incidents, excessive relative motions (termed as surging and yawing in this paper) between FPSO and tanker are identified as “failure prone situations” which have contributed to the initiation of most collision incidents. To quantitatively assess the probability of surging and yawing events, and more importantly, to effectively reduce their occurrence in tandem offloading operation, we present a simulation-based approach in this paper, which is carried out by a state-of-the-art time-domain simulation code SIMO. The SIMO simulation models are setup and calibrated for a typical North Sea purpose-built FPSO and a DP shuttle tanker. This 2-vessel system motion in tandem offloading is simulated. The simulated relative distance and relative heading between FPSO and tanker are analyzed by fitting their extreme values into statistical models. This gives out probabilities of surging and yawing events. Sensitivity studies are performed to analyze contributions from various technical and operational factors. Measures to minimize the occurrence of surging and yawing from design and operational point of view are proposed.

Study of the metrological characteristics of the hydrostatic pressure sensor

Sensor Review ◽  
2019 ◽  
Vol 39 (5) ◽  
pp. 665-669
Author(s):  
Igor S. Nadezhdin ◽  
Aleksey G. Goryunov ◽  
Yuri G. Svinolupov ◽  
Olga J. Zadorozhnaya
Keyword(s):  
Hydrostatic Pressure ◽  
Pressure Sensor ◽  
Measurement Errors ◽  
Design Methodology ◽  
Content Type ◽  
Sensor Model ◽  
Operational Characteristics ◽  
Calibration Algorithm ◽  
The Mathematical Model ◽  
Maximum Minimum

Purpose The purpose of this paper is to develop a digital hydrostatic pressure sensor with the required metrological and operational characteristics. The developed sensor is designed to control hydrostatic pressure in wells during various geophysical works and studies. Design/methodology/approach To obtain the required metrological and operational characteristics of the sensor, a method was developed and applied to reduce the measurement error based on the calibration algorithm and the sensor model. Findings By using the developed calibration algorithm and the mathematical model of the sensor, it was possible to compensate for the measurement errors of the hydrostatic pressure sensor. Originality/value In the course of this research, tests of the developed sensor were carried and the maximum/minimum of measurement result errors was determined.

Study on Torque Measurement Errors’ Compensation of Reducer Based on Piecewise PID Control

2012 ◽  
Vol 588-589 ◽  
pp. 1446-1449
Author(s):  
Kai Li ◽  
Feng Yuan ◽  
Xin Guo
Keyword(s):  
Measurement Errors ◽  
Measuring Error ◽  
Torque Measurement ◽  
Driven System ◽  
Wide Scale ◽  
Measuring Experiment ◽  
Measurement Experiment ◽  
Mechanical Factors ◽  
The Mathematical Model ◽  
Input Torque

Reducer’s input torque and output torque characteristics determine the kinematics performances of electro actuators. During the torque measurement experiment, many factors lead to torque measurement error, the major error components of which are mechanical assembly’s precision and electrical machine’s driven features. Compensating electrical errors and obtaining the real mechanical characteristics are meaningful and necessary especially on the conditions of wide-scale torque measuring. Neglecting mechanical factors’ influences, this paper pays attention to system’s control features based on the actual project with the demands of steady state and dynamic torque loading. Considering the quantized error, the mathematical model of power driven system is established, and the appropriate control algorithm of piecewise PID method is proposed, the simulation curves of which are expressed. The actual measuring experiment curves of rotating angle and compensated torque are drawn, the results of which illustrate the torque measuring error induced by drivers has been obviously removed, which validates the efficiency of such method.

On robustness of constrained discrete-time systems to state measurement errors

Automatica ◽  
2008 ◽  
Vol 44 (4) ◽  
pp. 1161-1165 ◽  
Author(s):  
B.J.P. Roset ◽  
W.P.M.H. Heemels ◽  
M. Lazar ◽  
H. Nijmeijer
Keyword(s):  
Discrete Time ◽  
Measurement Errors ◽  
Discrete Time Systems ◽  
State Measurement ◽  
Time Systems

scholarly journals ON LIE INDUCTION AND THE EXCEPTIONAL SERIES

2005 ◽  
Vol 04 (06) ◽  
pp. 707-737 ◽  
Author(s):  
JAN E. GRABOWSKI
Keyword(s):  
Lie Algebras ◽  
Necessary Conditions ◽  
Point Of View ◽  
Lie Bialgebras ◽  
Simple Complex ◽  
Single Node ◽  
Finite Dimensional ◽  
Dynkin Diagrams ◽  
Induction Process ◽  
And Algebra

Lie bialgebras occur as the principal objects in the infinitesimalization of the theory of quantum groups — the semi-classical theory. Their relationship with the quantum theory has made available some new tools that we can apply to classical questions. In this paper, we study the simple complex Lie algebras using the double-bosonization construction of Majid. This construction expresses algebraically the induction process given by adding and removing nodes in Dynkin diagrams, which we call Lie induction. We first analyze the deletion of nodes, corresponding to the restriction of adjoint representations to subalgebras. This uses a natural grading associated to each node. We give explicit calculations of the module and algebra structures in the case of the deletion of a single node from the Dynkin diagram for a simple Lie (bi-)algebra. We next consider the inverse process, namely that of adding nodes, and give some necessary conditions for the simplicity of the induced algebra. Finally, we apply these to the exceptional series of simple Lie algebras, in the context of finding obstructions to the existence of finite-dimensional simple complex algebras of types E9, F5 and G3. In particular, our methods give a new point of view on why there cannot exist such an algebra of type E9.

Sign in / Sign up

Export Citation Format

Share Document