... Abstract Integration of shape memory alloys (SMA) into actuator systems is still challenging, since mechanically and electrically anchoring are needed to provide stroke and trigger the shape memory effect (SME) in a controlled manner. A direct connection of SMA wires with printed circuit boards...

... Abstract The concept of a new piezoelectric actuator design is the focus of an ongoing smart structures research at DLR. It envisages actuator geometries, that have their template in nature and are aimed at optimally transfering their mechanical power to the structure in which...

... effectiveness depends on the needle’s ability to travel on a curved path, avoid obstacles, and maintain high targeting accuracy. Conventional needles are passive and have limited steerability and trajectory correction capability. This has motivated researchers to develop actuation mechanisms to create active...

... Abstract Today, Nickel-Titanium (NiTi)-based shape memory alloy (SMA) wires are already used in a wide range of commercial actuator applications. The combination of their unique properties, such as their high energy density as well as their biocompatibility provides a broad range...

... Abstract For repeated actuation in shape memory alloy (SMA) actuators, a restoring force is needed to return to the initial starting position after activation. Therefore, SMA wires are often coupled with mechanical springs, which lengthen said wires again after activation through heating...

... Abstract This paper presents a novel shape memory alloy (SMA) valve actuator concept for active venting in injection molding applications. The developed system can be used to expel air which is trapped during the injection molding process. If such air bubbles are not properly removed from...

... Abstract Following significant effort over the past several years by AFRL and NASA, the X-56A flight vehicle has proven to be a useful platform for exploring controllers and distributed actuation on a flexible, swept flying-wing. The program sought to advance the state of the art...

... of an intelligent redundant spacecraft actuator were assembled. Evaluating the intrinsic effect of SMA-wires, it was possible to detect signs of fatigue in the material and realize preventive maintenance. Beside a description of the manufacturing steps of both generations, the test results are presented in detail...

... Abstract The possibilities of a technical application of the shape memory effect are comprehensive and widespread. Besides the usage of arbitrary geometries, e.g. in the medical sector, especially wires are of great interest for unlocking mechanisms or other kinds of actuators. One...

... actuation and results using continuous CNTs of a CNT-array. For the first test series specimens are cut off a paper manufactured of single-walled, μ-long CNTs working in series. The second test series uses specimens which are prepared of free standing multi-walled CNTs. Their CNT lengths reach macroscopic...

... in composite material is discussed and the simulations results coming from finite element analyses in frequency and time domains are presented. de-icing composite piezoelectric leading edge impedance actuator ULTRASONIC DE-ICING SYSTEM FOR LEADING EDGE IN COMPOSITE MATERIAL Leandro Maio1...

... 24 08 2009 In order to get an understanding of the general characteristics of Carbon Nanotube (CNT) based actuators, the system response of the actuator was analyzed. Special techniques were developed in order to generate a reproducible characteristic measure for the material: the R...