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Torsional Vibration Testing of a Non
Torsional Vibration Testing of a Non

... check the performance of the proposed method, the torsional natural frequencies and mode shapes on a hollow aluminum shaft were extracted. The results obtained by the proposed transducer agreed favorably with theoretical results. ...
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RC Filter Networks

... voltage is considered to be that across the capacitor. The circuit was set up as in figure 7, with the appropriate values for R and for C being used. The half power-point and the phase shift at this frequency were measured, and this was compared with the theory. ...
Lab 10: Frequency Response of Filter Circuits
Lab 10: Frequency Response of Filter Circuits

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LM565 - Engineering Electronics Shop
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... A common method is to measure the impedance spectrum of the piezoelectric element. Because of the electro-mechanical coupling, mechanical resonances are visible on the spectrum and can be modeled. However, this method has two major drawbacks. First, it is only applicable for small signals and dynami ...


... overall and for a given frequency at a given time. The result is that the perceived frequency balance of a recording or reproduction of sound will vary with the listening level. There will only be one “correct” listening level, the level of the original performance. This is most notable at low liste ...
L. Huang, W. Rieutort-Louis, A. Gualdino, L. Teagno, Y. Hu, J. Mouro, J. Sanz-Robinson, J.C. Sturm, S. Wagner, V. Chu, J. Conde, and N. Verma, "An ASIC for Readout of Post-processed Thin-film MEMS Resonators by Employing Capacitive Interfacing and Active Parasitic Cancellation", VLSI Symp. on Circuits (VLSI) (JUN2014).
L. Huang, W. Rieutort-Louis, A. Gualdino, L. Teagno, Y. Hu, J. Mouro, J. Sanz-Robinson, J.C. Sturm, S. Wagner, V. Chu, J. Conde, and N. Verma, "An ASIC for Readout of Post-processed Thin-film MEMS Resonators by Employing Capacitive Interfacing and Active Parasitic Cancellation", VLSI Symp. on Circuits (VLSI) (JUN2014).

... drown out the resonant behavior. This paper proposes a noncontact MEMS interfacing and readout system in standard CMOS which enables robust integration while substantially rejecting the effects of parasitic feed-through capacitance. ...
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... The FMS6303 outputs are DC offset from the input by 150mV; therefore, VOUT = 2•VIN DC+150mV. This offset is required to obtain optimal performance from the output driver and is held at the minimum value to decrease the standing DC current into the load. Since the FMS6303 has a 2x (6dB) gain, the out ...
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HSP43124 - Intersil
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... langasite exhibit piezoelectric properties. A lot of artificial ceramics as barium titanate, lead titanate, lead zirconate titanate (PZT), potassium niobate, lithium niobate, and lithium tantalite have similar properties. The most known technical application is the piezoelectric transducer. In the l ...
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... frequency from 647 KHz to 1MHz. For different quality factor from 0.2 to 5, while the bias current was 60A, bandpass filter response is demonstrated in Figure 8. In the direction of the simulation results, the heoretical and simulation results are in good agreement. ...
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... signal using a RF mixer. The RF mixer will produce sum and difference of frequencies of its input signals (i.e. information signal and local oscillator’s output signal). The local oscillator output frequency is tuned so that the sum or difference of its output frequency and information signal freque ...
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MFJ-784 Manual - R
MFJ-784 Manual - R

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Mechanical filter



A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal frequencies, but to block others. The filter acts on mechanical vibrations which are the analogue of the electrical signal. At the input and output of the filter, transducers convert the electrical signal into, and then back from, these mechanical vibrations.The components of a mechanical filter are all directly analogous to the various elements found in electrical circuits. The mechanical elements obey mathematical functions which are identical to their corresponding electrical elements. This makes it possible to apply electrical network analysis and filter design methods to mechanical filters. Electrical theory has developed a large library of mathematical forms that produce useful filter frequency responses and the mechanical filter designer is able to make direct use of these. It is only necessary to set the mechanical components to appropriate values to produce a filter with an identical response to the electrical counterpart.Steel and nickel–iron alloys are common materials for mechanical filter components; nickel is sometimes used for the input and output couplings. Resonators in the filter made from these materials need to be machined to precisely adjust their resonance frequency before final assembly.While the meaning of mechanical filter in this article is one that is used in an electromechanical role, it is possible to use a mechanical design to filter mechanical vibrations or sound waves (which are also essentially mechanical) directly. For example, filtering of audio frequency response in the design of loudspeaker cabinets can be achieved with mechanical components. In the electrical application, in addition to mechanical components which correspond to their electrical counterparts, transducers are needed to convert between the mechanical and electrical domains. A representative selection of the wide variety of component forms and topologies for mechanical filters are presented in this article.The theory of mechanical filters was first applied to improving the mechanical parts of phonographs in the 1920s. By the 1950s mechanical filters were being manufactured as self-contained components for applications in radio transmitters and high-end receivers. The high ""quality factor"", Q, that mechanical resonators can attain, far higher than that of an all-electrical LC circuit, made possible the construction of mechanical filters with excellent selectivity. Good selectivity, being important in radio receivers, made such filters highly attractive. Contemporary researchers are working on microelectromechanical filters, the mechanical devices corresponding to electronic integrated circuits.
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