Monitoring of bolted joints - wireless, self-powered and retrofittable

Screw connections are often used in critical, safety-relevant places such as bridges, wind turbines, vehicles or machines, where they are permanently exposed to high loads. To ensure the safety of these connections, they require permanent monitoring of the preload force.

The »Smart Screw Connection« measures precisely and transmits wirelessly

The »Smart Screw Connection« enables wireless, self-powered monitoring of the preload force with the aid of a retrofittable sensor system for DIN screws: Using a special pressure and temperature thin film, known as the DiaForce® film, the tightening force as well as the temperature of the screw connection is regularly determined at the assembly location and transmitted to a cloud via a standardized interface.

Distribution of the preload force on the sensor disk
© Fraunhofer IIS
Distribution of the preload force on the sensor disk

The standardized mioty® radio technology is used to transmit the data, which is characterized by high energy efficiency and robustness over long distances.

The energy supply for the sensor and radio system is ensured by energy conversion from the immediate environment (energy harvesting). The »Smart Screw Connection« contains a thermogenerator that converts the smallest temperature gradients at the screw head into electrical energy and thus operates the sensor self-powered. Alternatively, the sensor and radio can also be powered by a solar cell or a small battery.

The »Smart Screw Connection« enables precise measurement of the preload force during assembly and operation. Deviations can thus be detected immediately via remote maintenance and downtime or maintenance times can be avoided - a complete control of critical screw connections.

Wireless

  • Low energy consumption
  • Range of several kilometers
  • High robustness in difficult environments

Self-powered

  • Self-powered operation through energy harvesting
  • Integrated energy storage for constant transmission of acquired sensor data

Retrofittable

  • Use of DIN screws
  • Can be retrofitted to existing screw and clamp connections

How does the »Smart Screw Connection« work?

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The »Smart Screw Connection« is a fully integrated IoT device with energy self-powered and wireless data transmission.

Find out more about the »Smart Screw Connection«, in which an integrated thin-film sensor system detects minimal changes in the preload force, transmits them wirelessly to a control unit and thus registers early detection of the loosening of a screw connection - wherever critical screw connections are used.  

The most important questions – answered briefly!

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Screw connections at critical points often require permanent monitoring of quality and reliability.

Project manager Dr. Peter Spies answers the most important questions about the »Smart Screw Connection«, e.g. which technologies are used, what the advantages of using it are and which applications are possible.

 

Application Areas

Bridges

Permanent monitoring

Wind power plants

Predictive maintenance

Railroad

Ensuring safety

Cranes

Efficient work

Aktuelles

 

Hannover fair 2022

Visit us at the Hannover Messe 2022 from May 30th to June 2nd in Hall 5, Stand A06.

 

WindEnergy Hamburg

Meet us at WindEnergy Hamburg 2022 from September 27th to 30th.

Your contact persons

Peter Spies

Contact Press / Media

Dr.-Ing. Peter Spies

Project Manager

Fraunhofer CCIT
Nordostpark 84
90411 Nuremberg, Germany

Phone +49 911 58061-3310

Philipp Schwerna

Contact Press / Media

Dr.-Ing. Philipp Schwerna

Business Development

Fraunhofer CCIT
Nordostpark 84
90411 Nuremberg, Germany

Phone +49 911 58061-6434

Moritz Protzner

Contact Press / Media

Moritz Protzner

Marketing

Fraunhofer CCIT
Nordostpark 84
90411 Nuremberg, Germany

Phone +49 911 58061-6423