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Search Petrowiki: Forcing function
...Glossary:Forcing function A ...forcing function is an external force that is acting on a vibrating system. This has the effect of modifying the vib...sometimes significantly. For example, in a rotating-drillstring system, the drill bit will impart a forcing vibration to the lower end of the string...
A forcing function is an external force that is acting on a vibrating system. This has the effect of modifying the vibrations that are experienced in the system, sometimes significantly. For example, in a rotating-drillstring system, the drill bit will impart a forcing vibration to the lower end of the string.
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...A forcing function is an external force that is acting on a vibrating system. This has the effect of modifying the vib...sometimes significantly. For example, in a rotating-drillstring system, the drill bit will impart a forcing vibration to the lower end of the string...
A forcing function is an external force that is acting on a vibrating system. This has the effect of modifying the vibrations that are experienced in the system, sometimes significantly. For example, in a rotating-drillstring system, the drill bit will impart a forcing vibration to the lower end of the string.
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...d critically damped CLO system. Forced vibration without damping The next sets of systems have a forcing function driving the vibration. The first of these is a CLO without damping (c 0), as shown in Fig. 3. The...tate term. The homogenous term is the same as in a free-vibration case and is solved by setting the forcing function to zero (that is, the free-vibration case,Eq. 9). If the same initial and boundary conditions are a...ogenous case is the same as before: ...(24) The second term is the effect of the forcing function on the system. This is solved by assuming a particular solution and deriving it back: ...
The most basic vibration analysis is a system with a single degree of freedom (SDOF), such as the classical linear oscillator (CLO), as shown inFigure 1. It consists of a point mass, spring, and damper. This example will be used to calculate the effects of vibration under free and forced vibration, with and without damping. Where needed, refer to thisrefresher on differential calculus. The first analysis is free vibration without damping.
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...Resonance occurs when the frequency of the forcing function is equal to one of the natural frequencies of the system...
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...Glossary:Resonance Resonance occurs when the frequency of the forcing function is equal to one of the natural frequencies of the system...
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...Self-excited vibrations occur when the forcing function is a ...function of the displacement, velocity, or acceleration of the system mass. If the energy gained from the se...
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...Glossary:Self-excited vibrations Self-excited vibrations occur when the forcing function is a ...function of the displacement, velocity, or acceleration of the system mass. If the energy gained from the se...
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...t is the rate of change of the distance with respect to time. A limit is defined as the value of a function at a given point as that point is approached from either higher or lower values (often referred to ...he limit (Y) of Eq. 1.1 at 3 seconds is: ...(1.4) Y is known as the limit of the function. In this simple case, Y is the same regardless of whether t approaches 3 from the left or the right... This is not true in all cases, however (e.g., with a discontinuous function). In these cases, the limit can be determined analytically. One can also determine the limit using ...
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...m for deterministic vibrations. Fig. 1.4 โ Vibration system classification. Fig. 1.5 โ Excitation function classification. Fig. 1.6 โ Types of elastic waves. Wave velocity depends primarily on density and...ig. 1.16 โ 2DOF free and damped CLO system. Example 1.8 โ 2DOF free and damped CLO system. Adding forcing complicates the equations considerably yet again. The procedure is the same, however, and it is a m...al frequency of a system is the frequency at which the system vibrates when free of any friction or forcing functions. A damped natural frequency is a natural frequency with friction. Damping is the dissipat...
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... breaker * Glossary:Foam cement * Glossary:FOC * Glossary:Fold * Glossary:Foot wall * Glossary:Forcing function * Glossary:Formaldehyde * Glossary:Formate * Glossary:Formation * Glossary:Formation breakdown ...
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