A New Strategy of Non-Linear Trajectory Generation for a Platoon to Reduce Inter-Vehicle Error Distance Estimation

A new strategy to design new molecules based on a fused hydrocarbon ring system comprising a COT ring and two 5-membered rings has been proposed for the study of second order NLO property.

Download Full-text

Control of a Permanent Magnet Synchronous Motor Using a Second-Order Non-Linear Trajectory Smoother

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1243/095965105x33626 ◽

2005 ◽

Vol 219 (8) ◽

pp. 565-575 ◽

Cited By ~ 4

Author(s):

K M Tsang ◽

J Wang

Keyword(s):

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Experimental Studies ◽

Variable Structure ◽

Second Order ◽

Linear Trajectory ◽

System Parameters ◽

Variable Structure System ◽

Non Linear ◽

Load Conditions

A second-order non-linear discrete trajectory smoother is coupled with conventional control law for servo-control of permanent magnet synchronous motors (PMSMs). Conventional control relies on three closed loops with linear proportional-integral-derivative (PID) controllers and gives an undesirable performance under the mismatch. of system parameters and load conditions. To overcome this drawback, a discrete-time second-order non-linear trajectory smoother is applied for the control of a PMSM. The second-order non-linear trajectory smoother is a non-linear variable structure system (VSS) catering for smooth trajectory generation for a motion control system. The trajectory smoother guarantees robustness against a change of system parameters and load conditions. Simulation and experimental studies are included to demonstrate the effectiveness of the proposed control scheme.

Download Full-text

Education and Forecasting in Education in the Era of Post-Post...

Russian Journal of Philosophical Sciences ◽

10.30727/0235-1188-2016-11-69-81 ◽

2018 ◽

pp. 69-81

Author(s):

Tigran Marinosyan

Keyword(s):

Education System ◽

State Regulation ◽

The State ◽

Learning System ◽

Vital Activity ◽

Linear Trajectory ◽

Modern Education ◽

Non Linear ◽

Long Term Forecasting

The author’s vision of the problem of long-term forecasting in education is presented in the article. The modern education, going beyond the limits of class-lesson learning system is gaining more and more territory in direct and figurative meanings. Its non-linear trajectory of movement and rhythm is a process that occurs by the model of Dispars - the principle of nomadic vital activity. The author is of the opinion that only a combination of forecasting with strategic and indicative planning as in Foresight technology may in a certain extent contribute to the state regulation of the education system.

Download Full-text

Frequency and Time Domain Analysis of Vortex Induced Vibrations for Free Span Pipelines

21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1 ◽

10.1115/omae2002-28064 ◽

2002 ◽

Cited By ~ 3

Author(s):

Carl M. Larsen ◽

Kamran Koushan ◽

Elizabeth Passano

Keyword(s):

Time Domain ◽

Structural Model ◽

Linear Time ◽

Time Domain Analysis ◽

Linear Response Theory ◽

Domain Model ◽

Vortex Induced Vibrations ◽

Non Linear ◽

New Strategy ◽

Stress Prediction

The present paper will discuss various models for calculation of vortex induced vibrations (VIV) of free span pipelines, and present a new strategy for such analyses. Applications of traditional models are presented and their limitations discussed. The new approach is based on the combination of an empirical linear frequency domain model, and a non-linear time domain structural model. The first step is to carry out the VIV analysis according to linear response theory, and next introduce the calculated hydrodynamic forces to the non-linear structural model. The benefit from using the non-linear model is to describe stresses at the shoulders more accurately, which is important since fatigue damage in many cases will be largest in this area. The conclusion is that the interaction between pipe and seafloor is crucial for accurate stress prediction, and that a non-linear time domain model will give the most accurate result.

Download Full-text

On Non-linear Trajectory Tracking via Variety-based Background Subtraction Models

IEEE Transactions on Signal Processing ◽

10.1109/tsp.2021.3139262 ◽

2021 ◽

pp. 1-1

Author(s):

Amr Elnakeeb ◽

Urbashi Mitra

Keyword(s):

Trajectory Tracking ◽

Background Subtraction ◽

Linear Trajectory ◽

Non Linear

Download Full-text

Analysis and Compensation Strategy of Non-Linear Error in Five-Axis CNC Machining

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.4967 ◽

2014 ◽

Vol 644-650 ◽

pp. 4967-4970 ◽

Cited By ~ 1

Author(s):

Hong Jun Liu ◽

Ai Guo Zhang ◽

Ji Bin Zhao ◽

Jin Shang ◽

Jun Liu

Keyword(s):

Complex Surface ◽

Cnc Machining ◽

Machining Accuracy ◽

Machining Error ◽

Tool Axis ◽

Non Linear ◽

New Strategy ◽

Tool Position ◽

Five Axis ◽

Tool Axis Vector

This paper presents a new strategy of analysis and compensation of non-linear error. Non-linear error is an important source of machining error in multi-axis numerical controlled machining and it is unavoidable. In view of tool positions optimization in five-axis CNC machining of complex surface, this paper presents a strategy for non-linear error compensation in five-axis machining: Firstly, non-linear error caused by the change of tool axis vector is analyzed and the non-linear error model is established, in order to get the maximum non-linear error of interpolation segment; Then, the tool position that meets the machining accuracy is obtained; Finally, Simulation and analysis of the model show that the proposed method is effective and greatly improves the geometric accuracy.

Download Full-text