The Characteristics of Fuel Motion Which Affect Airplane Dynamics

1952 ◽  
Vol 19 (3) ◽  
pp. 381-388 ◽  
Author(s):  
E. W. Graham ◽  
A. M. Rodriguez
Keyword(s):  
Dynamic System ◽  
Mechanical Systems ◽  
Aircraft Dynamics ◽  
Rectangular Tank

Abstract Problems in aircraft dynamics such as stability and response of the rigid airplane may be affected by fuel motion in the tanks. Such problems also might arise in connection with missiles. In this paper the response of the fuel to simple harmonic motions of a rectangular tank in translation, pitching, and yawing is studied. Using the force and moment expressions, simple mechanical systems equivalent to the fuel are constructed. These systems respond to motions of the tank walls in the same fashion as the fuel, producing identical forces and moments. The use of such mechanical analogies should simplify in many cases the analysis of the complete dynamic system.

scholarly journals Smart Mechanical Systems for Manufacturing in the Era of Industry 4.0: Condition-Based Predictive Maintenance and Dynamic System Modification for Small and Medium-Sized Enterprises

2021 ◽  
Vol 20 (2) ◽  
Author(s):  
Giovanni Carabin ◽  
Erich Wehrle ◽  
Renato Vidoni
Keyword(s):  
Dynamic System ◽  
Industry 4.0 ◽  
Industrial Revolution ◽  
Mechanical Systems ◽  
Predictive Maintenance ◽  
Condition Based Maintenance ◽  
Specific Target ◽  
New Class ◽  
Fourth Industrial Revolution ◽  
Potential Benefits

We are in the era of the fourth industrial revolution. Which highlights adaptability, monitoring, digitisation and efficiency in manufacturing as a result of the design of new smart mechanical systems. A central role in Industry 4.0 is played by maintenance and, within this framework, we define and review condition-based predictive maintenance. Thereafter, we propose a new class of smart mechanical systems that self-optimise utilising both condition-based maintenance and dynamic system modification. Akin to smart structures, smart mechanical systems will recognise and predict faults or malfunctions and, subsequently, self-optimise to restore desirable system behaviour. Potential benefits include increased reliability and efficiency while reducing cost without the requirement of highly skilled technicians. Thus, small and medium-sized enterprises are a specific target of such technology due to their increasing level of automatisation within Industry 4.0.

Dynamic Smoothing Effect in Non-Linear Dynamic System under Polyharmonic External Excitation

2019 ◽  
Vol 968 ◽  
pp. 421-426
Author(s):  
Viktorija Volkova
Keyword(s):  
Dynamic System ◽  
Mechanical Systems ◽  
Linear Dynamic System ◽  
Smoothing Effect ◽  
External Excitation ◽  
Rigid System ◽  
The Real ◽  
Linear Dynamic ◽  
Nonlinear Elastic ◽  
Elastic Characteristics

The effect of the polyharmonic external excitation causes the emergence or onset of novel properties in the system. The article devoted into the oscillations induced in a rigid system by the polyharmonic external excitation. The analysis of the results obtained in this research confirms that the systems with the nonlinear elastic characteristics are rather sensitive to the changes introduced into the external excitation according to the law. Therefore, some assumptions, for instance, those concerning the monoharmonic nature of changes in the external excitation, which are commonly used in studying the real mechanical systems, are not always correct.

A Method for Modifying Dynamic Properties of Undamped Mechanical Systems

1989 ◽  
Vol 111 (3) ◽  
pp. 403-408 ◽  
Author(s):  
Y. G. Tsuei ◽  
Eric K. L. Yee
Keyword(s):  
Dynamic System ◽  
Parametric Study ◽  
Dynamic Properties ◽  
Mechanical Systems ◽  
Force Response ◽  
Eigen Frequencies ◽  
Original Dynamic ◽  
Eigen Frequency

A method for the parametric study of the eigen frequencies and eigen vectors of a dynamic system is presented. The technique is based on the force response of the original dynamic system and gives a global picture for the behavior of the system with respect to the mass and stiffness parameters. It provides the sensitivity and feasibility of shifting the eigen frequency to a designed value; thus, it can be applied to the modal modification of a dynamic system. Because no iteration is required, the method is efficient.

scholarly journals Generalized Whittaker's equations for holonomic mechanical systems

1978 ◽  
Vol 1 (2) ◽  
pp. 245-253
Author(s):  
Munawar Hussain
Keyword(s):  
Hamiltonian System ◽  
Dynamic System ◽  
Differential Form ◽  
Equations Of Motion ◽  
General Theorem ◽  
Mechanical Systems ◽  
Classical Theorem ◽  
Energy Equations

In this paper the classical theorem “a conservative holonomic dynamic system is invariantly connected with a certain differential form” is generalized to group variables. This general theorem is then used to reduce the order of a Hamiltonian system by the use of the integral of energy. Equations of motion of the reduced system so obtained are derived which are the so-called generalized Whittaker's equations. Finally an example is given as an application of the theory.

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