lumped parameter

lumped parameter

[′ləmpt pə′ram·əd·ər]
(electricity)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Caption: Figure 8: Lumped parameter and aspect ratio in natural species.
Lumped parameter method is widely used to develop the dynamic model of PGTs, in which the PGT is simplified as a topology structure by assuming each component as rigid and the connection through kinematical joints, springs, and dampers.
Meanwhile, three sets of simulation models (lumped parameter model, integrated simulation model, and CFD simulation model) are built to compare the performances of different models.
Also, the so-called lumped parameter models based on the analogy to electric circuits (see, e.g., [3-5]) are widely used to simulate cerebral flow autoregulation mechanisms.
Comparing with the lumped parameter systems, it is more difficult to control these systems, especially for non-linear distributed parameter systems.
A lumped parameter multibranch model with l7 arterial units was developed to simulate the pulse wave propagation of the cardiovascular system.
The lumped parameter circuit may be used to model a segment of the cardiovascular system [8, 9, 10].
Here, we give a sensitivity analysis of the axis vibration characteristic giving a full consideration of the time-varying position of moving table and the changeable workpiece mass in the lead-screw feed drive system on the basis of the finite element and lumped parameter methods.
The final form of governing equations requires expansion of some terms and depends on how lumped parameter assumptions are applied for fluid properties, void fraction, and wall temperature at the interface between the regions, e.g., [p.sub.1][h.sub.1]=[p.sub.f][h.sub.f](1-[gamma])+[p.sub.g][h.sub.g]([gamma]) and [h.sub.2] = [0.5(h.sub.g] + [h.sub.o]).
When sound spreads through structures like narrow tubes, annular slits or over sharp corners, noticeable thermal and viscous effects take place causing further departure from the lumped parameter model.
Although the human body is a unified and complex active dynamic system, lumped parameter models are often used to capture and evaluate human dynamic properties.