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

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.

2011 ◽  
Vol 464 ◽  
pp. 53-56
Author(s):  
Hai Tao Zhang ◽  
Gang Li

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.


Author(s):  
A.S. Devyatisilnyi ◽  
V.M. Grinyak ◽  
A.V. Shurygin ◽  
Y.S. Ivanenko

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.


Sensor Review ◽  
2019 ◽  
Vol 39 (5) ◽  
pp. 665-669
Author(s):  
Igor S. Nadezhdin ◽  
Aleksey G. Goryunov ◽  
Yuri G. Svinolupov ◽  
Olga J. Zadorozhnaya

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.


2013 ◽  
Vol 313-314 ◽  
pp. 1100-1104
Author(s):  
En Zhe Song ◽  
Chang Xi Ji ◽  
Mei Liang Yin ◽  
Jun Sun ◽  
Cheng Shun Yin

This paper establishes the mathematical model of the volume speed-modulating system and simulates dynamically with Matlab/Simulink. Provide a theoretical basis for algorithm of close loop control [ of the three variables which are diesel engines, variable pump and variable motor. Use PID control algorithm, through simulation and analysis, find out the parameter optimization adjustment rule [2,, seek matching operation between three variables. Provide a theoretical basis for the study on dynamic system of full-hydraulic loaders and have very important practical significance in realizing high efficiency energy saving and reducing energy consumption.


2013 ◽  
Vol 274 ◽  
pp. 266-269
Author(s):  
Ke Ming Li ◽  
Chao Zhang

Noises in the imaging process will result in image measurement errors, so whether these noises can be effectively suppressed is the key to improve the measurement accuracy. This paper analyzes the noise components of TDI-CCD system from three perspectives, builds the mathematical model of typical noises, designs correlated double sampling noise processing circuit for TDI-CCD system, realizes the software implementation of hardware design and achieves the purpose to improve the signal-to-noise ratio and image quality


2013 ◽  
Vol 422 ◽  
pp. 123-126
Author(s):  
Hao Zhao

Apparent rotational angular acceleration exist in the stepper motor operation processing, the stepper motor torque angle characteristics were described and the mathematical model of motor are constructed; The actual angular acceleration of stepper motor on single-step operation is measured by self-developed rotating angular acceleration sensor, the experimental results show that the angular acceleration fluctuations of stepping motor on three single clap operation are little greater than on six clap operation, and there are return oscillations of motor on three single clap operation are obviously more than on six clap operation; Finally, the experimental phenomenon reasons are analyzed, and the corresponding conclusions are obtained.


2018 ◽  
pp. 50-55
Author(s):  
D. Losikhin ◽  
O. Oliynyk ◽  
O. Chorna

The mathematical model of calculating the entropy error of measurement is obtained in the article. Program listings are provided for calculating measurement errors under the normal and uniform law of distribution errors in the Python software environment.


2020 ◽  
Vol 97 (1) ◽  
pp. 97-104
Author(s):  
A.V. Ubaychin ◽  
◽  
A.P. Surzhikov ◽  
O. Starý ◽  
A.K. Khassenov ◽  
...  

This paper describes an achieved result in designing of the four-receiver microwave hyperspectrometer based on zero measurement method and the multi-receiver concept of realization. The block diagrams of the microwave front-end with operating frequency band from 18 to 26.5 GHz, the radiometric receiver, and the frequency transmission module are shown. The technical implementation of every described blocks of the microwave hyperspectrometer are described. Presented technical implementation includes a list of modern components are used to designing of laboratory model of hyperspectrometer. The detailed block diagram of the microwave front-end is presented. Description of main technical characteristics of parts of the microwave front-end is also presented. The analysis of a technical characteristics influence to measurement errors is shown. The mathematical model of a measurement error calculation in hyperspectral modeis described. The influence of the active reference noise generator temperature accuracy, the directional coupler insertion loss and the passive reference noise generator temperature accuracy to a measurement errors are described. A numerical experimental results of designed mathematical model are presented. The dependence of the minimum value of measurement errors form the temperature of passive noise generator is presented.


Author(s):  
Ting Yang ◽  
Fen Wu ◽  
Ming Liu ◽  
He (Helen) Huang

In this paper, we propose an effective approach to model the prosthetic leg dynamics for amputees wearing active-transfemoral prosthesis (ATP) which is self-powered. To accommodate unexpected effects of thigh on knee joints, the dynamic prosthesis model has been derived using both the thigh-knee-shank and the knee-shank configurations. Correlated with the amputee’s walking data, a nonlinear optimization problem is then formulated to identify the model parameters and the gains of the PD controller which is used to control the input torque for the ATP, while reducing measurement errors of the data. Moreover, the identified models are validated by comparing the predicted dynamics with experimental measurements. The advantages of proposed method in terms of simplicity, flexibility, and accuracy are demonstrated by the high correlation coefficients and the low root-mean-square errors.


2018 ◽  
Vol 19 (10) ◽  
pp. 680-688
Author(s):  
V. V. Slatin ◽  
M. A. Demkin ◽  
A. V. Golubkina

The questions of estimation of convergence of the processes received in single flight tests of an aviation complex and at mathematical modeling are considered. This evaluation is performed based on the methods of analysis of variance and means of verification of statistical hypotheses in decision-making on the convergence of the compared processes. For each of the compared processes, the least squares method determines the regression lines. By methods of mathematical statistics the permissible proximity of regression lines of the compared processes is established and the average regression line equivalent to the mathematical expectation of the analyzed statistical processes is determined. With respect to this line, the variance of deviations of the compared statistical processes is determined and their belonging to the General sample of processes is estimated. This suggests that under normal laws of the distribution of measurement errors there is an adequacy of the processes of the mathematical model of the stages of operation of the aviation complex and the observed processes of these stages during flight tests of the aviation complex under study.


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