Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Reexamination Certificate
1999-09-20
2001-01-09
Ramirez, Nestor (Department: 2834)
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
C310S051000
Reexamination Certificate
active
06172471
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bearing arrangement for a vibrating component having a bearing supported on a carrier for the vibrating component and having a damper which interacts with the carrier and has a inertial mass that can be moved relative to the carrier by a damper drive. The damper drive is with a drive circuit which includes at least one first sensing element for the vibrating component and a downstream signal generator which generates two harmonic, out-of-phase first signals whose frequencies correspond to each other and to the vibration of the machine part, as well as a second signal characterizing this frequency. The second signal is supplied to characteristic curve elements whose output signals are multiplied by the first signals of the signal generator, to generate third signals. The third signals obtained in this manner are added up in pairs, with the signals obtained in this manner each being multiplied by a fourth signal, which is generated by a second sensing element and characterizes the relative movements of the carrier. The resulting fifth signals obtained in this manner are each supplied to a transfer element. Sixth signals obtained in this manner each are multiplied by the first signals of the signal generator to result in seventh signals. The seventh signals obtained in this manner are added to an eighth signal that is used to operate the damper drive.
2. Description of the Related Art
A bearing arrangement for a vibrating component is known from German Patent 43 40 034 C1. In that patent, the active damper assigned to the bearing arrangement makes it possible to compensate for vibrations that occur over a broad range of frequencies. This can be used, for example, to isolate the vibration of a vehicle engine in relation to a vehicle body.
However, the disadvantage of the bearing arrangement known from German Patent 43 40 034 C1 is that the natural frequency of the damper must be less than or equal to the lowest frequency of the vibration to be compensated. In addition, the known bearing arrangement is unable to effectively compensate for vibrations if the frequency of the vibration to be compensated changes quickly.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a bearing arrangement with an expanded operating range which makes it possible to improve the compensation of vibrations, in particular when the frequencies of the vibrations to be compensated change quickly.
In the case of a bearing arrangement of the present invention, this object is achieved by providing a frequency response compensation which either fully or partially compensates for amplitude and/or phase changes in the force introduced by the inertial mass into the carrier, in particular due to changes in the frequency of the vibration to be compensated.
An embodiment of the present invention provides very effective compensation of disturbances even if the frequencies of the vibrations to be compensated change very fast. For example, it is possible to achieve very effective compensation of disturbances in internal combustion engines with high speed variations in speed ranges within which very steep gradients occur in the absolute value and phase of the actuating transfer function. It is also possible to expand the operating range of the active vibration damper if its entire frequency range, including the resonance range of the damper, can be used. Compared to known systems, this considerably reduces power consumption, since the active vibration damper works very efficiently in the resonant frequency range. In addition, it effectively compensates for vibrations in machine parts with pronounced resonances.
According to one advantageous embodiment of the present invention, the transfer elements have controllers designed as PI controllers. PI controllers are controllers which have both a proportional component and an integral component.
Frequency compensation can be carried out especially advantageously by providing the transfer elements with a frequency response compensation circuit.
It is possible to achieve especially effective frequency response compensation by evaluating the second signal for the frequency response compensation.
According to a refinement of the object of the present invention, the second signal is supplied to a time-delay element which generates a ninth signal; and the second signal and the ninth signal are supplied to characteristic curve elements which generate tenth and eleventh signals; and the tenth and eleventh signals are supplied to the transfer elements.
According to an improvement of the drive circuit, the tenth and eleventh signals influence the instantaneous performance of the transfer elements.
It has been proven to be advantageous if the time-delay element has a delay time between 0.1 msec. to 1 sec.
Designing the time-delay element as a shift register of a digital data processing system makes it especially easy to implement the drive circuit of the bearing arrangement according to the present invention.
It is also advantageous if the eighth signal is amplified by a power amplifier.
According to another especially advantageous embodiment of the present invention, the damper drive is composed of a coil which acts upon the inertial mass designed as a magnet.
REFERENCES:
patent: 4999534 (1991-03-01), Andrianos
patent: 5049768 (1991-09-01), Andersson
patent: 5883447 (1999-03-01), Clausin
Firma Carl Freudenberg
Jones Judson H.
Kenyon & Kenyon
Ramirez Nestor
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