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Mechanical resonator having a variable resonance frequency

A mechanical resonator has an electronically adjustable resonance frequency and is especially adapted to be used as a tunable vibration absorber. The mechanical resonator includes an inertial mass mounted on a free end of a spring, which is secured at its other end to the structure that is to be vibrationally damped. In order to vary the resonant frequency of the resonator, an electromechanical converter such as a piezoelectric element is connected to the spring and/or the inertial mass, and a displacement and/or acceleration sensor provides a sensor signal that is dependent on the respective displacement and/or acceleration of the spring and/or the inertial mass. An electronic control circuit generates an actuating signal based on the sensor signal. The actuating signal is applied to the electro-mechanical converter, which responsively exerts an adjusting force onto the spring and/or the inertial mass. The control circuit may include one or more variable amplifiers, inverters, and phase shifters, to control the actuating signal such that the adjusting force exerted by the electromechanical converter either counteracts or reinforces the bending force exerted by the inertial mass on the spring. In this manner, the effective total spring constant of the resonator can be increased or decreased relative to the inherent spring constant of the spring, whereby the resonant frequency is adjusted.
Owner:AIRBUS HELICOPTERS DEUT GMBH

Travel Pillow

The present invention discloses a C-shaped or an O-shaped travel pillow intended to be worn fastened around the user's neck haying a thinner base collar that is cushioned but stiff and completely closeable and overlapping around the person's neck, attached to a shorter softer raised and further cushion or pillow fixed to the top side of the base collar that can be adjusted to accommodate the person's coin as needed. The top of the peripheral walls of the base are attached to a raised cushion or pillow that is fuller and softer than the base. The base or collar is also cushioned but considerably stiffer and with longer ends than the top pillow, allowing the base collar of the invention to be fitted around the person's neck and closed completely underneath the person's chin to hold the person's neck immobile. Furthermore, the pillow top raised cushion is thicker than the sides, providing even more cushioning, support and stability for the person's head by easily adapting, to the shape of the headrest, seat or chair or the movement thereof.
Owner:GANG LISA KYUNG RIM +1
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