Delay of Digital Filter Tuned for Mechanical Resonant Frequency Reduction in Multi-mass Mechanical Systems in Electrical Direct Drive

2015 ◽  
Author(s):  
Dominik Luczak
Keyword(s):  
Resonant Frequency ◽  
Digital Filter ◽  
Mechanical Systems ◽  
Direct Drive ◽  
Mechanical Resonant Frequency

scholarly journals See Atoms in Motion!

1996 ◽  
Vol 4 (1) ◽  
pp. 3-4
Author(s):  
Stephen W. Carmichael
Keyword(s):  
Resonant Frequency ◽  
Atomic Force Microscope ◽  
Ultrahigh Vacuum ◽  
Atomic Motion ◽  
Atomic Resolution ◽  
Atomic Force ◽  
Silicon Cantilever ◽  
Mechanical Resonant Frequency ◽  
Reconstructed Surface ◽  
Stiff Spring

It is impressive enough that individual atoms can be resolved with the atomic force microscope (AFM), but who would have thought that atomic motion would be detected so soon? Atomic resolution with the AFM was only recently achieved. As reported in this column, Franz Giessibl was able to demonstrate local resolution of adatoms of the Si(111) 7×7 reconstructed surface. Now, Yasuhiro Sugawara. Masahiro Ohta, Hitoshi Ueyama, and Seizo Morita of Hiroshima University have demonstrated atomic resolution of the surface of InP(110). Not only that, but images taken about one minute apart show that some of the atoms had moved! Sugawara et al, used a very compact AFM under ultrahigh vacuum (4 X 10-8 Pa) to accomplish this impressive feat. A stiff (spring constant of 34 N/m) silicon cantilever was used. This stiffness, along with a mechanical resonant frequency of 151 kHz, was used to keep the cantilever from jumping onto the sample and crushing the initially sharp tip.

TUNING THE RESONANT FREQUENCIES OF FLEXURE MODE FLEXOELECTRIC PIEZOELECTRIC COMPOSITES

2011 ◽  
Vol 01 (01) ◽  
pp. 53-56 ◽  
Author(s):  
BAOJIN CHU ◽  
WENYI ZHU ◽  
MINGJIN CHU ◽  
NAN LI ◽  
L. ERIC CROSS
Keyword(s):  
Resonant Frequency ◽  
Ferroelectric Ceramic ◽  
Piezoelectric Response ◽  
Additional Mass ◽  
Resonant Frequencies ◽  
Piezoelectric Composites ◽  
Mechanical Resonant Frequency

The newly developed flexure mode flexoelectric composites have extremely high direct piezoelectric response around mechanical resonant frequency. Methods of tuning the resonant frequencies of the composites were studied in this paper. The resonant frequencies can be adjusted by changing dimensions of ferroelectric ceramic bars in the composites or by adding an additional mass on the composites. Design of flexure mode composites with multiple resonant frequencies was also studied.

scholarly journals Dynamic Mechanical Simulation of Miniature Silicon Membrane during Air Blast for Pressure Measurement

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 727 ◽  
Author(s):  
Julien Veyrunes ◽  
Jérôme Riondet ◽  
André Ferrand ◽  
Maylis Lavayssière ◽  
Alexandre Lefrançois ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Mechanical Behavior ◽  
Pressure Measurement ◽  
Rise Time ◽  
Silicon Membrane ◽  
Air Blast ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Mechanical Resonant Frequency ◽  
Short Rise Time

The development of new ultra-fast sensors for pressure air blast monitoring requires taking into account the very short rise time of pressure occurring during explosion. Simulations show here that the dynamic mechanical behavior of membrane-based sensors depends significantly on this rise time when the fundamental mechanical resonant frequency of the membrane is higher than 10 MHz.

A Unified Theory of Structure, Synthesis and Analysis of Multibody Mechanical Systems with Geometrical, Flexible and Dynamic Connections. Part 1. Basic Structural Equations and Universal Structure Tables

2020 ◽  
pp. 24-43 ◽  
Author(s):  
V.I. Pozhbelko
Keyword(s):  
Mechanical Systems ◽  
Kinematic Chain ◽  
Variable Structure ◽  
Structural Equations ◽  
Contact Friction ◽  
Unified Theory ◽  
Direct Drive ◽  
Variable Structure Systems ◽  
Kinematic Chains ◽  
Structure Synthesis

Multibody mechanical systems (mechanisms and machine drives) are widely used in different fields of modern engineering due to their reliability and simple design. They can be found in robots, manipulators, technological and construction equipment, automatic lines, etc. This paper presents a unified theory of structure, synthesis and analysis of mechanisms and machines with geometrical (single and multiple kinematic pairs), flexible contact (friction or belt) and dynamic contactless (inertial, gravitational, etc.) connections. The theory can be used to construct planar and spatial single- and multi-loop kinematic chains of machines with a given number of closed loops and driving motors. Areas of possible existence of multibody mechanical systems with open, closed and mixed kinematic chain are determined. Based on these findings, various planar and spatial gear and linkage patentable mechanisms are developed that can be used in vibrational drives, variable structure systems requiring precise stoppage during the cycle, lever actuators of multi-axle locomotives, spatial mixers with several mixing tanks, tribometers for measuring the limiting pulling capacity of flexible belts of belt-and-pulley drives, and direct-drive devices for horizontal motion of a suspended load with a low set velocity.

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