Systems and methods are provided for detecting theft of an enclosure of an autonomous vehicle. Pressure exerted by the enclosure to a fixture as measured by one or more piezoelectric sensors can be monitored. A change in the pressure exerted by the enclosure as measured by the one or more piezoelectric sensors can be detected. An alert can be generated based on the change in the pressure.

Systems and methods are provided for detecting theft of an enclosure of an autonomous vehicle. Pressure exerted by the enclosure to a fixture as measured by one or more piezoelectric sensors can be monitored. A change in the pressure exerted by the enclosure as measured by the one or more piezoelectric sensors can be detected. An alert can be generated based on the change in the pressure.

A pressure sensing device may include a body configured to distribute a load applied between first and second parts positioned one against the other, and a pressure sensor carried by the body. The pressure sensor may include a support body, and an IC die mounted with the support body and defining a cavity. The IC die may include pressure sensing circuitry responsive to bending associated with the cavity, and an IC interface coupled to the pressure sensing circuitry.

Mechanical integrity sensors are provided to detect occurrence of an out-of-tolerance force on a component, such as a circuit board. The mechanical integrity sensor includes a light-blocking container and a light collector disposed within the light-blocking container. The light-blocking container includes a breakable panel. The breakable panel fractures with a force on the breakable panel indicative of the out-of-tolerance force on the component. Fracturing of the breakable panel allows light into the light-blocking container, and the light is collected by the light collector as indicative of the occurrence of the out-of-tolerance force on the component.

A sensor (1) for measuring a tightening force applied on a screw-assembly member (2). The measurement sensor includes a ring and an electronic device comprising a longitudinal support strip having two opposite ends. The support strip is installed on a flat surface of the ring. The electronic device (26) includes a first circuit capable of generating a signal representative of a tightening force applied in a tightening direction on one of the two opposing faces; a second circuit capable of generating a signal representative of the distance of the applied force from the center of the ring in a first direction perpendicular to the tightening direction; and a third circuit capable of generating another signal representative of the distance of the applied force from the center of the ring in a second direction perpendicular to the tightening direction.

The invention relates to a solution for how to measure the strain in a washer mounted in a bolt assembly comprising a bolt, nut and washer. The invention concerns a strain measuring washer assembly comprising a plate shaped washer body, sound emitting means and sound detecting means, and a method for using such.

A system for monitoring fastener tension includes a fastener clamping a first member to a second member. A load monitoring sensor is interposed between a nut and the second member, and outputs an electrical signal upon changes in fastener tension. A signal collection hub is connected to the load monitoring sensor so that the electrical signal is transmitted from the load monitoring sensor to the signal collection hub. The signal collection hub collects and converts electrical signals into a data package. A processor transforms the data package into a digital representation of mechanical data. The mechanical data is compared to a predetermined mechanical limit value by the processor. If a value of the mechanical data is equal to or less than the predetermined mechanical limit value then an indication is generated to indicate that the fastener should be serviced.

A pressure sensing device may include a body configured to distribute a load applied between first and second parts positioned one against the other, and a pressure sensor carried by the body. The pressure sensor may include a support body, and an IC die mounted with the support body and defining a cavity. The IC die may include pressure sensing circuitry responsive to bending associated with the cavity, and an IC interface coupled to the pressure sensing circuitry.

An error of an axial force detection is reduced by tensioning a bolt with a tensioning device engaged with a part of the bolt, different from a shaft portion of the bolt. A tensioning device is configured to apply upward tension to a bolt fastened to a fastened member H, and fitted with a washer. A first male thread portion is formed on an outer circumferential surface of the washer. The tensioning device includes a connection member having a first female thread portion to be engaged with the first male thread portion, a tensioning mechanism for tensioning the connection member in a state where the first male thread portion is engaged with the first female thread portion, and a tension bearer which is disposed around an outer circumference of the connection member, and bears a reaction force applied from the fastened member H in tensioning performed by the tensioning mechanism.

A method, apparatus, and system to quantify tension forces of the anchor bolts for, e.g., SLTS support structures. A sensing assembly comprising one or more washers is installed along an anchor bolt. The sensing assembly comprises two spaced-apart surfaces between which a capacitance can be measured if electrical potential is created between the surfaces. The capacitance between the surfaces can be calibrated to bolt tension based on the relative distance between the surfaces. An RFRD circuit is connected to the two surfaces. An RF interrogation signal can supply the electrical potential and allow a reading of the responsive capacitance between surfaces to convert the capacitance reading into a bolt tension. Additionally, the introduction of the battery-free RFRD allows data to be acquired wirelessly from a distance, enabling an entirely new method of inspection. With minimum additional hardware cost, it provides a cost-effective way to replace traditional bolt installation and inspection methods.