We describe a mechanical model based on the beam theory for the development of a beam-like sensor switch with switching hysteresis for humidity sensing. The hydrogel swelling provides the mechanical energy to deflect the partly hydrogel-covered bending beam via the bimorph effect. From the model, we calculate the deflection of a beam-like sensor switch with and without a switching hysteresis. A beam-like sensor switch was manufactured, and the switching hysteresis was successfully demonstrated.

Vibrations in the manufacturing process are usually undesirable. However, vibrations in the ultrasonic range can be used to enhance process variables such as forces, wear or the machined surface. Thus far, it has not been possible to detect vibrations close to the process. This prevents a stable setting of vibration parameters. By measuring strains in the tool, conclusions about the shape and magnitude of vibrations could be drawn, enabling process-oriented measurements during turning.

In the context of the Industry 4.0 initiative, Cyber-Physical Production Systems (CPPS) or Cyber Manufacturing Systems (CMS) can be characterized as advanced networked mechatronic production systems gaining their added value by interaction with the ambient Industrial Internet of Things (IIoT). In this context IO-Link is one of the actual communication standards. This article presents IO-Link Wireless as the wireless extension to IO-Link.

We present a new technique which can be used in devices measuring the viscosity of a liquid. To this end, a steel ball is submerged in the liquid and levitated by magnetic forces. The ball's position is measured and controlled to keep the ball in a stable levitated position. The ball is then actuated to perform a circular motion through the liquid. This motion is measured and can be used to draw conclusions about the liquid's viscosity.

We present a non-destructive method to determine the material properties, for example elastic constants, of metal and polymer plates using laser-generated ultrasound. The ultrasonic signals are detected using an ultrasonic transducer that shows high sensitivity over a wide rage of frequencies. A method of signal processing to determine material properties is described and can be expanded upon to characterize more complex samples, such as fibre reinforced composites.