Mechanisms of Third-order Harmonic in TC-SAW Resonators Using a Nonlinear FEM Model

2021 ◽  
Author(s):  
Peng Guan ◽  
Ruchuan Shi ◽  
Yang Yang ◽  
Peng Qin ◽  
Tao Han
Keyword(s):  
Nonlinear Fem ◽  
Third Order ◽  
Fem Model ◽  
Saw Resonators

scholarly journals Moment Resistance of I-Section End-Plate Roof Girder Splices; A Case Study

2016 ◽  
Vol 62 (4) ◽  
pp. 187-200
Author(s):  
K. Żółtowski ◽  
P. Kalitowski
Keyword(s):  
Carrying Capacity ◽  
Nonlinear Fem ◽  
Fem Model ◽  
End Plate ◽  
Standard Code ◽  
Plate Connections ◽  
Code Procedure

AbstractThis article deals with the problem of determining the resistance of end-plate connections. A nonlinear FEM model of the joint was constructed in order to predict its carrying capacity. A standard code procedure was done as well. The analyses have been done to assess atypical end-plate joints designed and constructed as a part of roof structures.

Nonlinear Dynamic Response Analysis of Aircraft Landing Gear with Finite Element Modeling

2016 ◽  
Vol 826 ◽  
pp. 23-27
Author(s):  
Wei Guo Wu ◽  
Zhen Tao Wang ◽  
Teng Jia
Keyword(s):  
Dynamic Response ◽  
Nonlinear Response ◽  
Shock Absorber ◽  
Landing Gear ◽  
Response Analysis ◽  
Nonlinear Fem ◽  
Fem Model ◽  
Nonlinear Dynamic Response ◽  
Aircraft Landing ◽  
Aircraft Landing Gear

The precise model and the analysis of nonlinear response are important for the landing gear research. In this paper, the FEM model of landing gear was established. The shock absorber is modeled with the nonlinear spring and damper. Random displacements were applied for simulating runway unevenness at aircraft taxiing. Through the simulation, the nonlinear FEM dynamic response of landing gear was acquired. The results show that: the stress of landing gear is large in the landing progress, especially for the random displacements; the weakness of landing gear is the axle sleeve. So the material and technology of the axle sleeve are important in the design of landing gear.

Numerical Analysis of Tension Force Subjected by Flexible Mattress

2015 ◽  
Vol 740 ◽  
pp. 116-119
Author(s):  
Zhen Yu Li ◽  
Ping Yang ◽  
Zhi Hua Sun ◽  
Lin Suan Liu
Keyword(s):  
Numerical Analysis ◽  
Large Strain ◽  
Fem Analysis ◽  
Tension Force ◽  
Stress And Strain ◽  
Nonlinear Fem ◽  
Fem Model ◽  
In Situ Test ◽  
Distribution Of Stress

The nonlinear FEM analysis is performed to the problem of large strain nonlinear application for flexible mattress. The element with cloth type option is used to establish the FEM model for the analysis of flexible mattress. The simulation can produce correct profile of deformation, accurate distribution of stress and strain, meanwhile taking account of geometric nonlinear from large strain. The results of the paper are compared with those from the theory and in-situ test. Some valuable conclusions are made from the results analysis.

Steel Arch Stabilized by a Textile Membrane

2016 ◽  
Vol 821 ◽  
pp. 733-740
Author(s):  
Ondřej Svoboda ◽  
Josef Machacek
Keyword(s):  
Membrane Structure ◽  
Complex Analysis ◽  
Complex Structure ◽  
Computational Design ◽  
Nonlinear Behaviour ◽  
Nonlinear Fem ◽  
Fem Model ◽  
Complex Membrane ◽  
Out Of Plane ◽  
Structural Configurations

A slender steel arch supporting textile membranes in a complex membrane structure with respect to in-plane and out-of plane stability is investigated. In the last decades the textile membranes are widely used to cover both common and exclusive structures due to progress of new membrane materials with eminent properties. In comparison with use of a traditional roof decking these structures are much more economical and attractive. However, the complex analysis and computational design methods are demanding and still not codified. The real physical model of a membrane structure supported by two inner steel arches and covering a concert stage was constructed and tested in laboratory of CTU in Prague. The membrane used was the Précontraint 702S Ferrari1 prestressed textile membrane with PVC coating. The arches were hot-formed in a workshop from Grade S355J0 steel. The paper presents experimental results for: i) isolated inner arch, ii) complex structure of the membrane with supporting arches, both under symmetrical and asymmetrical loading. Furthermore the numerical nonlinear FEM model created in SOFiSTiK software package and its validation for the above structural configurations and loading is presented. Subsequent parametrical studies cover various levels of the membrane prestressing to show its significance for nonlinear behaviour and stability of the inner arch. Finally some recommendations concerning numerical modelling are presented.

scholarly journals A Pinning Actor-Critic Structure-Based Algorithm for Sizing Complex-Shaped Depth Profiles in MFL Inspection with High Degree of Freedom

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhenning Wu ◽  
Yiming Deng ◽  
Lixing Wang
Keyword(s):  
Depth Profile ◽  
Degrees Of Freedom ◽  
Nonlinear Fem ◽  
Fem Model ◽  
Reconstruction Process ◽  
Depth Profiles ◽  
Ill Posed ◽  
High Degree ◽  
Pinning Strategy ◽  
Flux Leakage

One of the most efficient nondestructive methods for pipeline in-line inspection is magnetic flux leakage (MFL) inspection. Estimating the size of the defect from MFL signal is one of the key problems of MFL inspection. As the inspection signal is usually contaminated by noise, sizing the defect is an ill-posed inverse problem, especially when sizing the depth as a complex shape. An actor-critic structure-based algorithm is proposed in this paper for sizing complex depth profiles. By learning with more information from the depth profile without knowing the corresponding MFL signal, the algorithm proposed saves computational costs and is robust. A pinning strategy is embedded in the reconstruction process, which highly reduces the dimension of action space. The pinning actor-critic structure (PACS) helps to make the reward for critic network more efficient when reconstructing the depth profiles with high degrees of freedom. A nonlinear FEM model is used to test the effectiveness of algorithm proposed under 20 dB noise. The results show that the algorithm reconstructs the depth profile of defects with good accuracy and is robust against noise.

Probe size and 5th-order aberration

1987 ◽  
Vol 45 ◽  
pp. 134-135 ◽  
Author(s):  
Zhifeng Shao
Keyword(s):  
Electron Probe ◽  
Spherical Aberration ◽  
Wave Length ◽  
Cylindrical Symmetry ◽  
Electron Wave ◽  
Third Order ◽  
The Third ◽  
Probe Radius ◽  
Small Probe ◽  
Probe Size

A small electron probe has many applications in many fields and in the case of the STEM, the probe size essentially determines the ultimate resolution. However, there are many difficulties in obtaining a very small probe.Spherical aberration is one of them and all existing probe forming systems have non-zero spherical aberration. The ultimate probe radius is given byδ = 0.43Csl/4ƛ3/4where ƛ is the electron wave length and it is apparent that δ decreases only slowly with decreasing Cs. Scherzer pointed out that the third order aberration coefficient always has the same sign regardless of the field distribution, provided only that the fields have cylindrical symmetry, are independent of time and no space charge is present. To overcome this problem, he proposed a corrector consisting of octupoles and quadrupoles.

Children’s Recall of Approximations to English

1973 ◽  
Vol 16 (2) ◽  
pp. 201-212 ◽  
Author(s):  
Elizabeth Carrow ◽  
Michael Mauldin
Keyword(s):  
Language Development ◽  
Fourth Order ◽  
Third Order ◽  
Memory Processes ◽  
The Third ◽  
General Index ◽  
General Linguistic

As a general index of language development, the recall of first through fourth order approximations to English was examined in four, five, six, and seven year olds and adults. Data suggested that recall improved with age, and increases in approximation to English were accompanied by increases in recall for six and seven year olds and adults. Recall improved for four and five year olds through the third order but declined at the fourth. The latter finding was attributed to deficits in semantic structures and memory processes in four and five year olds. The former finding was interpreted as an index of the development of general linguistic processes.

The influence of third-order interactions on the density profile of associating hard spheres

1997 ◽  
Vol 91 (4) ◽  
pp. 761-767 ◽  
Author(s):  
D. HENDERSON ◽  
S. SOKOŁOWSKI ◽  
R. ZAGORSKI ◽  
A. TROKHYMCHUK
Keyword(s):  
Density Profile ◽  
Hard Spheres ◽  
Third Order
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