Power Flow and Energy Balance Between Nonconservatively Coupled Oscillators

1991 ◽  
Vol 113 (4) ◽  
pp. 448-454 ◽  
Author(s):  
Genda Chen ◽  
T. T. Soong
Keyword(s):  
Energy Balance ◽  
Complex Systems ◽  
Dynamic Analysis ◽  
Coupled Oscillators ◽  
Power Flow ◽  
Structural Systems ◽  
Numerical Examples ◽  
Definition Of ◽  
Limiting Case ◽  
Consistent Formulation

The concept of power flow, which has been found to be a powerful tool in the dynamic analysis of complex systems with conservative connecting elements, is extended to the case of nonconservatively coupled mechanical or structural systems. In order to avoid any ambiguity in the definition of power flow in this situation, the nonconservatively coupled oscillators are considered as a limiting case of oscillators with conservative connections. Through the introduction of dissipative power and penetrating power flow, this approach is shown to produce a physical consistent formulation. Some important and distinguishing properties of this formulation are demonstrated and discussed through numerical examples.

Edges of Regression and Limit Normal Point of Conjugate Surfaces1

1998 ◽  
Vol 122 (4) ◽  
pp. 419-425 ◽  
Author(s):  
Ningxin Chen
Keyword(s):  
Differential Geometry ◽  
Contact Boundary ◽  
Boundary Line ◽  
Tangent Point ◽  
Common Tangent ◽  
Numerical Examples ◽  
Envelope Surface ◽  
The Common ◽  
Conjugate Surfaces ◽  
Definition Of

The presented paper utilizes the basic theory of the envelope surface in differential geometry to investigate the undercutting line, the contact boundary line and the limit normal point of conjugate surfaces in gearing. It is proved that (1) the edges of regression of the envelope surfaces are the undercutting line and the contact boundary line in theory of gearing respectively, and (2) the limit normal point is the common tangent point of the two edges of regression of the conjugate surfaces. New equations for the undercutting line, the contact boundary line and the limit normal point of the conjugate surfaces are developed based on the definition of the edges of regression. Numerical examples are taken for illustration of the above-mentioned concepts and equations. [S1050-0472(00)00104-5]

scholarly journals Dynamic Analysis for VSG-Based Power Flow Control Applied to DG Systems

2021 ◽  
Author(s):  
THIAGO FIGUEIREDO DO NASCIMENTO ◽  
ANDRES ORTIZ SALAZAR
Keyword(s):  
Power Systems ◽  
Dynamic Analysis ◽  
Power Flow ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Dynamic Performance ◽  
Synchronous Generator ◽  
Power Flow Control ◽  
Grid Impedance ◽  
Impedance Parameters

The integration of distributed generation (DG) systems based on renewable energy sources (RES) by using power converters is an emerging technology in modern power systems. Among the control strategies applied to this new configuration, the virtual synchronous generator (VSG) approach has proven to be an attractive solution due providing suitable dynamic performance. Thus, this paper presents a dynamic analysis of gridtied converters controlled by using VSG concept. This analysis is based on a dynamic model that describes the DG power flow transient characteristics. Based on this model, the grid impedance parameters variation effects on the VSG controllers dynamic performance are discussed. Simulation results are presented to evaluate the effectiveness of the theoretical analysis performed.

scholarly journals HISTORICAL REVIEW OF DESIGN DEVELOPMENT OF MOTOR CAR GEARBOXES

2017 ◽  
Vol 2017 (1) ◽  
pp. 125-132
Author(s):  
Владимир Кучкаров ◽  
Vladimir Kuchkarov ◽  
Дмитрий Демидов ◽  
Dmitriy Demidov
Keyword(s):  
Power Flow ◽  
Main Part ◽  
Fuel Efficiency ◽  
Historical Review ◽  
Main Task ◽  
Design Development ◽  
High Fuel Efficiency ◽  
Definition Of ◽  
Absence Of Power

The paper reports the review in the development of motor car gearbox design. The main task consists in the detection of the reasons for changes in gearbox design for the definition of the field for gearbox substantiated application in motor car design. In the main part the advantages and shortcomings of manual, automated, infinitely variable and automatic gearboxes are under consideration. There are shown and analyzed functional diagrams of gearbox designs considered. In the conclusion it is pointed out that the most promising design of a gearbox is a robot gearbox with two clutches allowing the assurance of the absence of power flow break; the smoothness of gear shifts and smoothness of motion; comfort of control; high fuel efficiency; high tractiondynamic characteristics.

About concept of complex systems, their basic attributes, properties and characteristics

2021 ◽  
Vol 6 ◽  
Author(s):  
J.B. Mikhailov ◽  
Keyword(s):  
Complex Systems ◽  
Definition Of

Definition of concept «complex systems», their basic attributes, properties and characteristics (parameters of quality) is brought.

Security Solutions for Intelligent and Complex Systems

2020 ◽  
pp. 1232-1271
Author(s):  
Stuart Armstrong ◽  
Roman V. Yampolskiy
Keyword(s):  
Complex Systems ◽  
Research And Development ◽  
Social Engineering ◽  
Great Power ◽  
Future Research ◽  
Negative Effects ◽  
Safety Issues ◽  
The World ◽  
Particular Solution ◽  
Definition Of

Superintelligent systems are likely to present serious safety issues, since such entities would have great power to control the future according to their possibly misaligned goals or motivation systems. Oracle AIs (OAI) are confined AIs that can only answer questions and do not act in the world, represent one particular solution to this problem. However even Oracles are not particularly safe: humans are still vulnerable to traps, social engineering, or simply becoming dependent on the OAI. But OAIs are still strictly safer than general AIs, and there are many extra layers of precautions we can add on top of these. This paper begins with the definition of the OAI Confinement Problem. After analysis of existing solutions and their shortcomings, a protocol is proposed aimed at making a more secure confinement environment which might delay negative effects from a potentially unfriendly superintelligence while allowing for future research and development of superintelligent systems.

AF 447 as a Paradigmatic Accident

2021 ◽  
pp. 1-27
Author(s):  
Antonio Chialastri
Keyword(s):  
Complex Systems ◽  
Human Factors ◽  
Cognitive Demands ◽  
Human Machine Interaction ◽  
History Of ◽  
Definition Of ◽  
Machine Interaction

In this chapter, the author presents a human factors problem for automation: why, when, and how automation has been introduced in the aviation domain; what problems arise from different ways of operating; and the possible countermeasures to limit faulty interaction between humans and machines. This chapter is divided into parts: definition of automation, its advantages in ensuring safety in complex systems such as aviation; reasons for the introduction of on-board automation, with a quick glance at the history of accidents in aviation and the related safety paradigms; ergonomics: displays, tools, human-machine interaction emphasizing the cognitive demands in high tempo and complex flight situations; illustration of the AF 447 case, a crash happened in 2009, which causes are linked to faulty human-machine interaction.

scholarly journals A Novel Power Losses Reduction Method Based on a Particle Swarm Optimization Algorithm Using STATCOM

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2851 ◽  
Author(s):  
Valeriya Tuzikova ◽  
Josef Tlusty ◽  
Zdenek Muller
Keyword(s):  
Particle Swarm Optimization ◽  
Power Flow ◽  
Particle Swarm ◽  
Electric Power Industry ◽  
Main Function ◽  
Power Losses ◽  
Swarm Optimization ◽  
Flexible Ac Transmission ◽  
Definition Of ◽  
Ac Transmission

In the modern electric power industry, Flexible AC Transmission Systems (FACTS) have a special place. In connection with the increased interest in the development of “smart energy”, the use of such devices is becoming especially urgent. Their main function is the ability to manage modes in real time: maintain the necessary level of voltage in the grids, control the power flow, increase the capacity of power lines and increase the static and dynamic stability of the power grid. The problem of system reliability and stability is related to the task of definitions and optimizations and planning indicators, design and exploitation. The main aim of this article is the definition of the best placement of the STATCOM compensator in case to provide stability and reliability of the grid with the minimization of the power losses, using Particle Swarm Optimization algorithms. All calculations were performed in MATLAB.

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