This paper presents the fabrication and the testing of piezoelectric unimorph actuators with embedded piezoelectric sensors which are meant to be used for the actuation of the Micromechanical Flying Insect (MFI). First the fabrication process of a piezoelectric bending actuator comprising a standard unimorph and a rigid extension is described together with the advantages of adding such an exten...

The purpose of the paper is to present an approach to detect, isolate and accommodate the sensor or actuator faults using bank of unknown input observers (UIO). Full order observers, reduced order observers, unknown input observers and Kalman Filter are widely used in state estimations [1]. After the estimation of states, fault detection and isolation can be provided by conducting residual anal...

This paper presents a study for identifying damage locations in an idealized steel bridge girder using the ambient vibration measurements. A sensitive damage feature is proposed in the context of statistical pattern recognition to address the damage detection problem. The study utilizes an experimental program that consists of a two-span continuous steel beam subjected to ambient vibrations. Th...

(1) Berkeley Sensor and Actuator Center – University of California at Berkeley – 497 Cory Hall – Berkeley, California, 94704 U.S.A. Tel +1 (510) 642 4876, Fax +1 (510) 643 6637, Email [email protected] (2) Berkeley Sensor and Actuator Center – University of California at Berkeley – 497 Cory Hall – Berkeley, California, 94704 U.S.A. Tel +1 (510) 642 9360, Fax +1 (510) 643 6637, Email liepman...

conomic pressures are dispersing machine intelligence away E from centralized computers toward distributed Fieldbus devices. Simultaneously, the control concept is being extended to include other operational factors such as quality assurance, process data management, just-in-time maintenance, and plant safety and availability. As credible sensing and actuation are essential prerequisites for ad...

Modular self-assembling on-orbit robots have the potential to reduce mission costs, increase reliability, and permit on-orbit repair and refueling. Modules with a variety of specialized capabilities would self-assemble from orbiting inventories. The assembled modules would then share resources such as power and sensors. As each free-flying module carries its own attitude control actuators, the ...

Acid or base concentrations can be determined by coulometric titration. A new alliridium oxide sensor-actuator device is presented, of which the titrant is generated by a reversible redox reaction occurring in the electroactive iridium oxide actuator electrode, and the equivalence point in the titration curve is detected by the pH-sensitive iridium oxide sensor. The advantage with respect to th...

The purpose of the paper is to present an approach to detect, isolate and accommodate the sensor or actuator faults using bank of observer and unknown input observers (UIO). Full order observers, reduced order observers, unknown input observers and Kalman Filter are widely used in state estimations [1]. After the estimation of states, fault detection and isolation can be provided by conducting ...

In this paper we present a self-organizing and self-stabilizing cluster and routing algorithm for actuator and sensor networks that is solely based on publish/subscribe primitives. The algorithm design captivates with its simplicity and is yet robust against node and link failures. The provided publish/subscribe middleware which incorporates the algorithm allows an elegant application design fo...

In this paper we present our view of sensor and actuator networks, how we position them relative to the network of the future and what support such networks would both bring to and require from the existing and future core network. We put a special emphasis on the support infrastructure, and describe our envisioned architecture for a future ubiquitous sensor and actuator framework