scholarly journals Formalization of task of movement in longitudinal-transverse plane of tele-controlled underwater vehicles

2021 ◽  
pp. 168-177
Author(s):  
И.М. Данцевич ◽  
М.Н. Лютикова ◽  
Ю.Ю. Метревели

В статье рассматривается модель движения телеуправляемого необитаемого подводного аппарата в продольной и поперечной плоскостях. Движение телеуправляемого аппарата в маршевом режиме или режимах компенсации перемещений рабочих инструментов достигается комбинацией упоров движителей. Новизна полученных результатов состоит в получении наборов компенсирующих коэффициентов в трёхмерной задаче интерполяции на регулярной сетке. Решение задачи – это частное решение системы дифференциальных уравнений, описывающих динамику телеуправляемого необитаемого аппарата с учётом изменения угла атаки, скольжения и скоростного крена в условиях наиболее распространённого типа движения телеуправляемого необитаемого аппарата. Перекосы в системе управления движителями вызваны неточностями установки в плане прямоугольной платформы с уравновешивающими блоками плавучести движителей, погрешностями изготовления элементов движительно-рулевого комплекса. Динамика движения рассматривается как статистическая задача с усреднением и линеаризацией характеристик упоров движителей, размещённых в плане платформы нулевой плавучести в продольной плоскости. Компенсация перекосов упоров в движительно-рулевом комплексе достигается вычислением коэффициентов компенсации в системе управления по статистикам, полученным в испытательном бассейне методом наименьших квадратов. Скомпенсированная система управления соответствует линейной модели управления телеуправляемого необитаемого аппарата. The article illustrates model of motion of a tele-controlled uninhabited underwater vehicle in longitudinal and transverse planes is considered. Motion of ROV in marching mode or modes of compensation of movements of working tools is achieved by combination of thrusts of propellers. The novelty of the results obtained consists in obtaining sets of compensating coefficients in the three-dimensional interpolation problem on a regular grid. The solution of the problem is a partial solution of a system of differential equations describing the dynamics of a tele-controlled uninhabited apparatus, taking into account changes in the angle of attack, sliding and speed roll in the conditions of the most common type of movement of a tele-controlled uninhabited apparatus. Distortions in the propulsion control system are caused by inaccuracies in the installation in plan of a rectangular platform with balancing units of buoyancy of propulsors, errors in the manufacture of elements of the propulsion-steering system. Motion dynamics is considered as a statistical problem with averaging and linearization of the characteristics of the thrusters of the movers located in terms of the zero buoyancy platforms in the longitudinal plane. Compensation of thrust distortions in the propulsion-steering system is achieved by calculation of compensation coefficients in the control system according to statistics obtained in the test basin using the least squares method. The compensated control system corresponds to a linear control model of a tele-controlled uninhabited apparatus.

2013 ◽  
Vol 331 ◽  
pp. 254-259
Author(s):  
Jie Qiong Lin ◽  
Jin Yue ◽  
Xiao Ping Gao ◽  
Tong Han Ran

The three-dimensional elliptical vibration cutting can realize high efficient and low cost of method of optical free surface cutting, whose effective drive form is the stack of piezoelectric ceramics to achieve the vibration in three directions . but the crosstalk phenomenon generated in the process of the piezoelectric movement make the tool deviate the ideal trajectory so that seriously affect the quality of the workpiece surface, damage the tool. Thus a method of removing the crosstalk generated in the three-dimensional elliptical vibration cutting device and its control system is proposed in the paper. The control system model of a three-dimensional elliptical vibration cutting is established, then, the crosstalk data is assumed, using the least squares method to fit the date, crosstalk compensation algorithm is obtained so that the crosstalk removal module can be designed to remove the crosstalk generated the piezoelectric movement ,the final section is the simulation-based analysis, the simulation results show that the method can meet the control requirements of the three-dimensional elliptical vibration, the crosstalk of piezoelectric movement can be removed effectively.


1998 ◽  
Vol 08 (12) ◽  
pp. 2439-2448 ◽  
Author(s):  
Baltazar Aguirre ◽  
Jose Alvarez-Ramírez ◽  
Rodolfo Suárez

This work is concerned with linear control systems subjected to saturated feedback. A first harmonic approach is used to describe the existence of nonsymmetric periodic orbits in a three-dimensional control system. By taking a high-gain parametrization of the feedback control, the presence of nonsymmetric (first harmonic) periodic orbits is demonstrated for certain values of the parameter. Since it is also shown that nonsymmetric periodic orbits do not exist for small and large values of the parameter, evidences are found of the existence of symmetry breaking bifurcations.


Robotica ◽  
2021 ◽  
pp. 1-27
Author(s):  
Taha Elmokadem ◽  
Andrey V. Savkin

Abstract Unmanned aerial vehicles (UAVs) have become essential tools for exploring, mapping and inspection of unknown three-dimensional (3D) tunnel-like environments which is a very challenging problem. A computationally light navigation algorithm is developed in this paper for quadrotor UAVs to autonomously guide the vehicle through such environments. It uses sensors observations to safely guide the UAV along the tunnel axis while avoiding collisions with its walls. The approach is evaluated using several computer simulations with realistic sensing models and practical implementation with a quadrotor UAV. The proposed method is also applicable to other UAV types and autonomous underwater vehicles.


2011 ◽  
Vol 267 ◽  
pp. 217-220 ◽  
Author(s):  
Jiang Tian Shi ◽  
De Xin Sun ◽  
Hong Zhuang Zhang

Mechanical structure of three degree of freedoms SCARA robot adopts horizontal joints, and opening PMAC multitude axis motion controller based PC is looked as kernel of control system, adopts the open hardware and software structure, we can conveniently enlarge its functions according to needs, so it has very good expansibility. Its three-dimensional solid model and virtual assemble is carried out using CATIA application, so that we can estimate the status of interference. Through validation, we can prove the feasibility of the robot.


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