Even though active constrained layer damping system generally consists of three elements – active layer,
passive layer and host beam; depending on placement and type of sensor, several variations of ACLD
systems are developed over the years some of which are shown in Fig. 37.1 (a –f).
Figure 37.1: Active constrained layer damping
Three commonly used
sensors for such application are
- distributed piezoelectric sensor placed below the constrained damping
layer (Fig. 37.1a),
- strain gauge sensor placed below the active constraining layer (Fig. 37.1c) and
- accelerometer placed either on top of the constraining layer or on the host beam (Fig. 37.1b and d).
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The actuation capability of ACLD are often enhanced either by applying two ACLD layers on top and
bottom of the host beam (Fig. 37.1e) or by using edge elements to connect the active layer directly to the host beam (Fig. 37.1f). The use of edge elements provides a direct connection between the host beam and the active layer, increasing the controllability of the system.
Congratulations! You have finished Module 6.
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