An induction pressing plate type real-time monitoring apparatus, including a fixing portion, an abutting portion, and an inductor. The fixing portion has a hole for fixing and connecting a fastener to an upper or lower platform of a forming device. The abutting portion is connected to the fixing portion, and the abutting portion in at least part of a pressure surface region is configured to press a tested piece to be induced. The inductor is disposed at the abutting portion, and has an induction unit for inducing actual information transmitted to the abutting portion by the direct contact of the tested piece and converting the actual information into measurable data, an output unit for outputting the data, and a power supply unit for providing power to the induction unit and the output unit.

An induction pressing plate type real-time monitoring apparatus, including a fixing portion, an abutting portion, and an inductor. The fixing portion has a hole for fixing and connecting a fastener to an upper or lower platform of a forming device. The abutting portion is connected to the fixing portion, and the abutting portion in at least part of a pressure surface region is configured to press a tested piece to be induced. The inductor is disposed at the abutting portion, and has an induction unit for inducing actual information transmitted to the abutting portion by the direct contact of the tested piece and converting the actual information into measurable data, an output unit for outputting the data, and a power supply unit for providing power to the induction unit and the output unit.

According to one embodiment, a vibration detecting device includes a housing, a vibration sensor in the housing, a circuit board in the housing, a flexible wiring component, a first face, and a second face. The vibration sensor is housed in the housing. An electric component that processes a detection signal of the vibration sensor is provided on the circuit board. The wiring component electrically connects the vibration sensor and the circuit board. The first face is provided on the housing and is configured to be attached to an object. The second face is provided inside the housing and is inclined with respect to the first face, the vibration sensor being attached thereto.

According to one embodiment, a vibration detecting device includes a housing, a vibration sensor in the housing, a circuit board in the housing, a flexible wiring component, a first face, and a second face. The vibration sensor is housed in the housing. An electric component that processes a detection signal of the vibration sensor is provided on the circuit board. The wiring component electrically connects the vibration sensor and the circuit board. The first face is provided on the housing and is configured to be attached to an object. The second face is provided inside the housing and is inclined with respect to the first face, the vibration sensor being attached thereto.

A vibration transducer module for detecting a vibratory signal, comprising a base, a spring connected to the base at a first location, a mass mechanically coupled to the spring at a second location remote from the first location, and a wall configured to position a first wall electrode and a second wall electrode a selected distance from the first location, the conductive element positioned and sized to contact the first wall electrode and the second wall electrode. The mass comprises a conductive element, and an energy harvester to provide a first voltage signal. The energy harvester may comprise a piezoelectric material or be construct as a SAW device. The module may be combined with a rectifier and an oscillator to form a vibration sensor.

A vibration transducer module for detecting a vibratory signal, comprising a base, a spring connected to the base at a first location, a mass mechanically coupled to the spring at a second location remote from the first location, and a wall configured to position a first wall electrode and a second wall electrode a selected distance from the first location, the conductive element positioned and sized to contact the first wall electrode and the second wall electrode. The mass comprises a conductive element, and an energy harvester to provide a first voltage signal. The energy harvester may comprise a piezoelectric material or be construct as a SAW device. The module may be combined with a rectifier and an oscillator to form a vibration sensor.

An electromagnetic type quasi-zero stiffness absolute displacement sensor that includes an intermediate shaft, upper end cover, first sliding bearing arranged on the upper end cover, upper housing fixedly connected to the upper end cover, electromagnetic coil fastened onto an inner wall of the upper housing, spiral spring, spring support connected to a lower end of the spiral spring, force sensor fastened onto a lower end surface of the spring support, lower end cover fastened onto lower end surface of the force sensor, and a lower housing connected to the lower end cover; the intermediate shaft sequentially passes through, from top down, the first sliding bearing, upper end cover, and electromagnetic coil, and is connected to an upper end of the spiral spring; and the upper housing is provided therein with a ring permanent magnet that is nested on the intermediate shaft and is not in contact with the electromagnetic coil.

An electromagnetic type quasi-zero stiffness absolute displacement sensor that includes an intermediate shaft, upper end cover, first sliding bearing arranged on the upper end cover, upper housing fixedly connected to the upper end cover, electromagnetic coil fastened onto an inner wall of the upper housing, spiral spring, spring support connected to a lower end of the spiral spring, force sensor fastened onto a lower end surface of the spring support, lower end cover fastened onto lower end surface of the force sensor, and a lower housing connected to the lower end cover; the intermediate shaft sequentially passes through, from top down, the first sliding bearing, upper end cover, and electromagnetic coil, and is connected to an upper end of the spiral spring; and the upper housing is provided therein with a ring permanent magnet that is nested on the intermediate shaft and is not in contact with the electromagnetic coil.

An acoustic vector sensor (AVS) includes one or more sensitive elements arranged in an orthogonal configuration to provide high-sensitivity directional performance. The one more sensitive elements may be seismometers arranged in a pendulum-type configuration. The AVS further includes a hydrophone.

A monitoring system for monitoring behaviour of a rotating shaft is provided. The system includes a phonic wheel which is mounted coaxially to the shaft for rotation therewith, the phonic wheel having a number N of teeth in a circumferential row. The system further includes a first sensor configured to detect the passage of the teeth of the phonic wheel by generating a first alternating measurement signal which includes (i) a primary oscillatory component having a frequency of fN, where f is the rotational frequency of the shaft, and (ii) a secondary oscillatory component of frequency f when the phonic wheel precesses such that each revolution of the shaft a clearance between the phonic wheel and the first sensor cyclically varies between a maximum value and a minimum value. The system further includes a processor unit configured to determine the durations of successive first speed samples, each first speed sample being a block of integer n successive cycles of the primary oscillatory component of the first alternating measurement signal. The secondary oscillatory component of the first alternating measurement signal, when present, produces a cyclical variation of frequency fin the durations of the successive first speed samples. The processor unit is further configured to detect any such cyclical variation of the first speed samples and to compare a detected cyclical variation of the first speed samples against a threshold variation to determine therefrom if the phonic wheel is precessing.