Introduction

The invention relates to a measuring and wireless transmitting bolt in order to detect and send the data related to the dynamics and thermal stress of a mechanical device, such as a railway bogie. Moreover it allows the monitoring of the state of wear of the rolling stock and the execution of any maintenance operations, at reduced costs. It also provides a control logic for the device.

Technical features

It is proposed here the use of a miniaturized, wireless based and energy autonomous system, constituted by an instrumented bolt for axle-boxes. The system includes:

• A CPU Board Control Center;
• A rechargeable battery;
• MEMS-based inertial sensors;
• A temperature sensor;
• A miniaturized energy harvester;
• A wireless RF transmitter.

The screw is part of a monitoring system which includes two control units:

• One on carriage for local control;
• One on the tractor, equipped with alarm systems and / or display to report any anomalies to the driver.

The control logic for the data processing is based on programmable parameters and operates on a cycle of measurement, and not on continuous measures, based on the driving dynamics station.

Possible Applications

• Vehicle Diagnostic;
• Substitution of bolts/screws for closing the axle-boxes covering;
• Braking Systems;
• Suspensions;
• Measurement & Wireless transmission of data related to dynamic stress.

Advantages

• Reduced cost and time of maintenance and diagnostics;
• No need for re-approval of the vehicle according to the current regulations;
• Reliable and precise monitoring;
• Reduced energy consumption (through energy harvester technology);
• Instrumented Mechanical Components.