scholarly journals Assessment of Miniature Piezoelectric Travelling-Wave Beam and Plate Robots

2021 ◽  
Vol 8 (3) ◽  
pp. 199-216
Author(s):  
Adel Razek
Keyword(s):  
Traveling Wave ◽  
Autonomous Robots ◽  
Wave Beam ◽  
Piezoelectric Actuators ◽  
Travelling Wave ◽  
Thin Structures ◽  
Specific Medium ◽  
Piezoelectric Beam ◽  
Different Types ◽  
Amplifying Effect

Different up-to-date utilizations have found several benefits in condensing the size of autonomous robots. Miniature traveling wave piezoelectric robots have proven to be appropriate for many of these applications. The principles of locomotion embraced in these robots are mainly inspired by natural biological locomotion and could be categorized by their movement through a specific medium. In this article, after having highlighted the amplifying effect of piezoelectric actuators generating the locomotion necessary for robotic requests, we will review the different types of such locomotion. Next, we will discuss the traveling wave piezoelectric resonant robots. Succeeding, we will look at the operation and usages of piezoelectric beam and plate robots. Finally, we will discuss the modeling aspects implicated in these robots and more generally, the modeling of piezoelectric patches stuck on thin structures. Keywords: piezoelectric, miniature, travelling-wave, locomotion, beam and plate robots

scholarly journals Development of Traveling Wave Actuators Using Waveguides of Different Geometrical Forms

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ramutis Bansevicius ◽  
Dalius Mazeika ◽  
Vytautas Jurenas ◽  
Genadijus Kulvietis ◽  
Vytautas Bakanauskas
Keyword(s):  
Experimental Study ◽  
Numerical Modelling ◽  
Contact Surface ◽  
Experimental Analysis ◽  
Traveling Wave ◽  
Piezoelectric Actuators ◽  
Operating Principle ◽  
Contact Points ◽  
Cone Type ◽  
Different Types

The paper covers the research and development of piezoelectric traveling wave actuators using different types of the waveguides. The introduced piezoelectric actuators can be characterized by specific areas of application, different resolution, and torque. All presented actuators are ultrasonic resonant devices and they were developed to increase amplitudes of the traveling wave oscillations of the contact surface. Three different waveguides are introduced, that is, symmetrical, asymmetrical, and cone type waveguide. A piezoelectric ring with the sectioned electrodes is used to excite traveling wave oscillations for all actuators. Operating principle, electrode pattern, and excitation regimes of piezoelectric actuators are described. A numerical modelling of the actuators was performed to validate the operating principle and to calculate trajectories of the contact points motion. Prototype actuators were made and experimental study was performed. The results of numerical and experimental analysis are discussed.

scholarly journals Identification of N-glycans with GalNAc-containing antennae from recombinant HIV trimers by ion mobility and negative ion fragmentation

2021 ◽  
Author(s):  
David J. Harvey ◽  
Anna-Janina Behrens ◽  
Max Crispin ◽  
Weston B. Struwe
Keyword(s):  
Cross Sections ◽  
Ion Mobility ◽  
Travelling Wave ◽  
Negative Ion ◽  
Ion Fragmentation ◽  
Structural Identity ◽  
Immunodeficiency Virus ◽  
Different Types ◽  
Complex Glycans ◽  
Ion Collision

AbstractNegative ion collision-induced dissociation (CID) of underivatized N-glycans has proved to be a simple, yet powerful method for their structural determination. Recently, we have identified a series of such structures with GalNAc rather than the more common galactose capping the antennae of hybrid and complex glycans. As part of a series of publications describing the negative ion fragmentation of different types of N-glycan, this paper describes their CID spectra and estimated nitrogen cross sections recorded by travelling wave ion mobility mass spectrometry (TWIMS). Most of the glycans were derived from the recombinant glycoproteins gp120 and gp41 from the human immunodeficiency virus (HIV), recombinantly derived from human embryonic kidney (HEK 293T) cells. Twenty-six GalNAc-capped hybrid and complex N-glycans were identified by a combination of TWIMS, negative ion CID, and exoglycosidase digestions. They were present as the neutral glycans and their sulfated and α2→3-linked sialylated analogues. Overall, negative ion fragmentation of glycans generates fingerprints that reveal their structural identity.

Design of coaxial and waveguide couplers for helix TWT

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mukesh Kumar Alaria ◽  
Sanjay Kumar Ghosh
Keyword(s):  
Traveling Wave ◽  
Return Loss ◽  
Characteristic Impedance ◽  
Three Dimensional ◽  
Waveguide Coupler ◽  
Quarter Wavelength ◽  
Different Types ◽  
Waveguide Type ◽  
Transformer Design ◽  
Traveling Wave Tubes

Abstract In this paper, two types of coaxial coupler and waveguide coupler for different frequency helix traveling wave tubes (TWTs) are designed, fabricated and cold tested. The coaxial coupler includes of window ceramic and RF transformer section. At present multi-section impedance transformer design approach is used for wideband helix TWTs. In any helix TWT, impedance of the source is transformed to the characteristic impedance of helix. This is done by the quarter-wavelength (λ/4) impedance transformation approach. The simulated results of different types of couplers are carried out by HFSS and CST microwave studio software and compare with experimental results. Three-dimensional electromagnetic field simulators allowing the any geometry with port excitations it is possible to model the complex coaxial and waveguide type couplers with helix SWS assembly and predict its desired return loss performances.

Separation and Manipulation of Particles Using Traveling Wave Dielectrophoretic Force

2009 ◽  
Vol 74 ◽  
pp. 219-222
Author(s):  
Thitima Maturos ◽  
Kata Jaruwongrangsee ◽  
Assawapong Sappat ◽  
Tanom Lomas ◽  
Anurat Wisitsoraat ◽  
...  
Keyword(s):  
Red Blood Cells ◽  
Applied Voltage ◽  
Traveling Wave ◽  
Blood Cells ◽  
Electrode Array ◽  
Travelling Wave ◽  
Cell Manipulation ◽  
Mixed Solution ◽  
Traveling Wave Dielectrophoresis ◽  
Parallel Electrode

In this work, we present a device for cell manipulation and separation by using travelling wave dielectophoretic force. The device consists of a 16 parallel electrode array and microchamber. The dielectrophoretic PDMS chamber was fabricated by using standard microfabrication techniques. The Cr/Au parallel electrode array of 100 µm wide and 300 nm thick was patterned on a glass slide by sputtering through microshadow mask. The polystyrene microspheres suspension in de-ionized water and red blood cells in D-mannitol solution were used as tested cells. Cells respond to the electric field in various mechanisms depending on the applied voltage and frequency of the AC signals. For 4.5 µm polystyrene, the traveling wave dielectrophoresis happened when the applied voltage was 10 V, and the frequency of the applied signals was in the range of 50 kHz-700 kHz. For 10 µm polystyrene the twDEP occurred when the applied voltage was 7 V, and frequency was in the range 30 kHz-1MHz. While the red blood cells experienced the twDEP when the applied voltage was 3 V and frequency was in the range 50 kHz-2MHz. The mixed solution containing equal amount of 4.5 and 10 µm microspheres were used for separation test. The big microspheres were moved under twDEP force when the applied voltage was 7 V, and the frequency was in the range of 25 kHz-1MHz while the small microspheres were attached to the electrodes. Therefore, the twDEP device can manipulate and separate the microspheres with different sizes, and it can be further applied for cells selection.

Unprotected Loss of Flow Analysis of a Million Kilowatt Traveling Wave Reactor Core

2017 ◽  
Author(s):  
Wenjun Hu ◽  
Pengrui Qiao
Keyword(s):  
Fast Reactor ◽  
Traveling Wave ◽  
Nuclear Reactor ◽  
Flow Analysis ◽  
Reactor Core ◽  
Travelling Wave ◽  
Nuclear Nonproliferation ◽  
Utilization Rate ◽  
Technological Level ◽  
Long Lifetime

Traveling wave reactor (TWR) is an innovation concept nuclear reactor, through the once-through deep burning, the proliferation of fuel can be achieved and the utilization rate of Uranium can be increased. TWR has the characteristics of long lifetime, deep burn up and nuclear nonproliferation, because of its physical character, which makes it to be an attractive innovation concept fast reactor. The China institute of atomic energy (CIAE) has designed a million kilowatt TWR core based on a breeding and burn principle, which has considered the current technological level of sodium cooled fast reactor. In this paper, based on the TWR core design scheme, considered the design of fuel assembly, neutronics and thermal-hydraulic, analyzed the Unprotected loss of flow (ULOF) accident in the TWR core with the SAS4A code, through which research about the transient safety characteristics of a million kilowatt travelling wave reactor core has been done. Analysis shows that the peak temperature of fuel, cladding and coolant in the TWR core have a certain margin from the safety limits through the negative feedback of itself in the ULOF accident, the core of the million kilowatt TWR demonstrates a good safety performance.

An Improved Wide Area Travelling Wave Fault Location Algorithm

2012 ◽  
Vol 241-244 ◽  
pp. 373-378
Author(s):  
Yu Chen ◽  
Dong Liu ◽  
Bing Yin Xu
Keyword(s):  
Traveling Wave ◽  
Fault Location ◽  
Travelling Wave ◽  
Wide Area ◽  
The Real ◽  
Counter Example ◽  
Location Algorithm

In order to enhance the reliability of traveling wave fault location (TWFL) systems, an improved wide area traveling wave fault location (WA-TWFL) algorithms is presented in this paper. In the disturbance area that near to the fault position, we can first get the possible fault positions by using the outgoing path data from the substation that first records the initial traveling wave, then use the possible fault position to verify the reasonableness of data recorded. The fault position that has no counter-example in logical is the real fault position. EMTP simulation verifies the validity and applicability of this algorithm.

scholarly journals On Forced Response of a Rotating Integrally Bladed Disk: Predictions and Experiments

2010 ◽  
Author(s):  
Claude Gibert ◽  
Vsevolod Kharyton ◽  
Fabrice Thouverez ◽  
Pierrick Jean
Keyword(s):  
Dynamic Response ◽  
Piezoelectric Actuators ◽  
Travelling Wave ◽  
Forced Response ◽  
Phase Shifting ◽  
Electronic Circuits ◽  
Bladed Disk ◽  
High Pressure Compressor ◽  
Pressure Compressor ◽  
Finite Elements Model

An experimental setup is described which permits to rotate a bladed disk in vacuum and to measure its dynamic response to excitations provided by some embedded piezoelectric actuators. A particular spatial placement of actuators associated with phase-shifting electronic circuits is set for simulating travelling wave excitations with respect to the rotating frame. The system is demonstrated on an actual high-pressure compressor (HCP) integrally bladed disk. The dynamic response of the blisk is analyzed experimentally and results are correlated with those obtained from a simplified finite elements model taking into account Coriolis effect. The paper focuses on the influence of the latter which is most of the time neglected and its implication on the forced response levels is studied into two situations without or with mistuning.

scholarly journals Travelling wave solutions for a surface wave equation in fluid mechanics

2016 ◽  
Vol 20 (3) ◽  
pp. 893-898 ◽  
Author(s):  
Yi Tian ◽  
Zai-Zai Yan
Keyword(s):  
Wave Equation ◽  
Fluid Mechanics ◽  
Traveling Wave ◽  
Traveling Wave Solutions ◽  
Expansion Method ◽  
Travelling Wave ◽  
Linear Wave ◽  
Travelling Wave Solutions ◽  
Linear Wave Equation ◽  
Wave Solutions

This paper considers a non-linear wave equation arising in fluid mechanics. The exact traveling wave solutions of this equation are given by using G'/G-expansion method. This process can be reduced to solve a system of determining equations, which is large and difficult. To reduce this process, we used Wu elimination method. Example shows that this method is effective.

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