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Active Control of Ocean Vehicle Multidimension Vibration and Motion

Chen Xiuxiang,Ma Lüzhong,Wu Weiguang,Zhu Wei

Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 52-56

Abstract:

Active control multi-dimension vibration device based on parallel mechanismsand electromagnetic actuator is used to realize the multidimensional low-frequency vibration damping With the vibration control device, structural design, system control model analysis and control The results of prototyping testing indicate that with the active control multi-dimension vibrationdamping the multi-dimensional low-frequency vibration active controled of shipping under sail can be

Keywords： electromagnetic actuator active control multi-dimension vibration parallel mechanisms

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Fuzzy Extension Economy Control with the Restriction of Multi-dimension Jieke

Li Hua,Liu Feng,He Zhongxiong

Strategic Study of CAE 2001, Volume 3, Issue 8, Pages 51-57

Abstract:

This paper discussed the intelligence control of the complex large scale systems , especially of the economy system. The entity participated in competition is regarded as a point in the fuzzy extension economy space, and all kinds of restriction conditions as a N-dimensions' jieke. Then the definition of the jieke's restriction degree is given. When the entity participates in competition, it must get the information first, and wipe off the information yawp. In order to find the best jieke and jie-gate, the extension force can be used.

Keywords： complex large scale system FEES jieke impact jie-gate extension

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PD pattern recognition based on multi-fractal dimension in GIS

ZHANG Xiaoxing, YAO Yao, TANG Ju, ZHOU Qian, XU Zhongrong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3, Pages 270-275 doi: 10.1007/s11465-008-0042-1

Abstract: The multi-fractal dimension is founded on the box-counting dimension and multi-fractal theories.The GIS gray intensity images distillation methods, based on multi-fractal characteristics, is put forwardThe box-counting dimension, multi-fractal dimension, and discharge centrobaric characteristics of the

Keywords： substation high-speed discharge centrobaric network ultra-high frequency

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Application of coupled multi-body dynamics–discrete element method for optimization of particle damperfor cable vibration attenuation

Danhui DAN, Qianqing WANG, Jiongxin GONG

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1, Pages 244-252 doi: 10.1007/s11709-021-0696-x

Abstract: With the application of the particle damping technology to cable vibration attenuation, the rootlessIn this paper, a coupled multi-body dynamics–discrete element method is proposed to simulate the dampingThe analyses are done by combining the discrete element method in EDEM and multi-body dynamics in ADAMS

Keywords： granular material vibration control discrete element method particle damper cable vibration

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Robust topology optimization of multi-material lattice structures under material and load uncertainties

Yu-Chin CHAN, Kohei SHINTANI, Wei CHEN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2, Pages 141-152 doi: 10.1007/s11465-019-0531-4

Abstract: Enabled by advancements in multi-material additive manufacturing, lightweight lattice structures consistingThis work proposes a density-based robust topology optimization method for meso- or macro-scale multi-materialgeneralized material interpolation scheme for an arbitrary number of materials, and employs univariate dimensionThe accuracy of univariate dimension reduction is validated by comparing the results to the Monte Carlo

Keywords： robust topology optimization lattice structures multi-material material uncertainty load uncertainty univariate dimension reduction

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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Frontiers of Structural and Civil Engineering Pages 981-993 doi: 10.1007/s11709-023-0979-5

Abstract: This study modeled the moving-vehicle-induced forcing excitation on a single-span prismatic bridge as a multiple frequency-multiplication harmonic load on the modal coordinates of a linear elastic simple Euler–Bernoulli beam, and investigated the forced modal oscillation and resonance behavior of this type of dynamic system. The forced modal responses consist of multiple frequency-multiplication steady-state harmonics and one damped mono-frequency complementary harmonic. The analysis revealed that a moving load induces high-harmonic forced resonance amplification when the moving speed is low. To verify the occurrence of high-harmonic forced resonance, numerical tests were conducted on single-span simple beams based on structural modeling using the finite element method (FEM) and a moving sprung-mass oscillator vehicle model. The forced resonance amplification characteristics of the fundamental mode for beam response estimation are presented with consideration to different end restraint conditions. The results reveal that the high-harmonic forced resonance may be significant for the investigated beams subjected to vehicle loads moving at specific low speeds. For the investigated single-span simple beams, the moving vehicle carriage heaving oscillation modulates the beam modal frequency, but does not induce notable variation of the modal oscillation harmonic structure for the cases that vehicle of small mass moves in low speed.

Keywords： forced vibration linear Euler beam moving load harmonic structure frequency modulation end restraints

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Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2, Pages 109-117 doi: 10.1007/s11465-013-0252-z

Abstract: Multi-frequency control in frequency domain was achieved by simulation through the NN-based control systemsThese works lay a solid foundation for the active vibration control of mechanical structures.

Keywords： active vibration control (AVC) neural network (NN) low frequency noise frequency domain control multi-frequency

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Optimal slot dimension for skirt support structure of coke drums

Edward WANG, Zihui XIA

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 4, Pages 554-562 doi: 10.1007/s11465-018-0513-y

Abstract:

The skirt-to-shell junction weld on coke drums is susceptible to fatigue failure due to severe thermal cyclic stresses. One method to decrease junction stress is to add slots near the top of the skirt, thereby reducing the local stiffness close to the weld. The most common skirt slot design is thin relative to its circumferential spacing. A new slot design, which is significantly wider, is proposed. In this study, thermal-mechanical elastoplastic 3-D finite element models of coke drums are created to analyze the effect of different skirt designs on the stress/strain field near the shell-to-skirt junction weld, as well as any other critical stress locations in the overall skirt design. The results confirm that the inclusion of the conventional slot design effectively reduces stress in the junction weld. However, it has also been found that the critical stress location migrates from the shell-to-skirt junction weld to the slot ends. A method is used to estimate the fatigue life near the critical areas of each skirt slot design. It is found that wider skirt slots provide a significant improvement on fatigue life in the weld and slot area.

Keywords： coke drum stress analysis cyclic stress fatigue life skirt slots

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Hierarchical fractal structure of perfect single-layer graphene

T. Zhang, K. Ding

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4, Pages 371-382 doi: 10.1007/s11465-013-0279-1

Abstract: Two efficient methods for calculating the fractal dimension of this fresh member was also provided.The outer boundary curve had a fractal dimension equal to one, and a multi-fractal structure from a naturallyA fundamental example of a multi-fractal structure was also presented.

Keywords： hierarchical fractal structure fractal dimension the fifth space-filling curve multi-fractal structure

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Vibration analysis of multi-walled carbon nanotubes embedded in elastic medium

Pattabhi R. BUDARAPU,Sudhir Sastry YB,Brahmanandam JAVVAJI,D. Roy MAHAPATRA

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 2, Pages 151-159 doi: 10.1007/s11709-014-0247-9

Abstract: We propose a method to estimate the natural frequencies of the multi-walled carbon nanotubes (MWCNTs)

Keywords： natural frequencies multi-walled carbon nanotubes (MWCNTS) elastic medium

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Immunometabolism: a new dimension in immunotherapy resistance

Frontiers of Medicine 2023, Volume 17, Issue 4, Pages 585-616 doi: 10.1007/s11684-023-1012-z

Abstract: Herein, we elaborate potential mechanisms underlying immunotherapy resistance from a novel dimension

Keywords： immune cell immunometabolism metabolic reprogramming immunotherapy resistance tumor microenvironment immune checkpoint inhibitor

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Diagnosis method based on wavelet coefficient scale relativity correlation dimension for fault

GU Junjie, TIAN Jin, PENG Xuezhi

Frontiers in Energy 2008, Volume 2, Issue 2, Pages 164-168 doi: 10.1007/s11708-008-0031-4

Abstract: Correlation dimension as a tool to describe machinery condition is introduced.Vibration signals of the fan under different working conditions are analyzed using a threshold filteringThe correlation dimension is able to identify conditions of the fan with faults compared with the normal

Keywords： effective technology monitoring mechanical equipment relativity Correlation

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Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0730-2

Abstract: Ultrasonic vibration-assisted grinding (UVAG) is an advanced hybrid process for the precision machiningIts performance considerably influences the vibration amplitude and resonant frequency.In this work, a novel perforated ultrasonic vibration platform resonator was developed for UVAG.vibration characteristics.The performance of the vibration platform was evaluated by the vibration tests and UVAG experiments of

Keywords： ultrasonic vibration-assisted grinding perforated ultrasonic vibration platform vibration characteristics

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Structural dimension optimization and mechanical response analysis of fabricated honeycomb plastic pavement

Zixuan CHEN; Tao LIU; Xiao MA; Hanyu TANG; Jianyou HUANG; Jianzhong PEI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 7, Pages 896-908 doi: 10.1007/s11709-022-0856-7

Abstract: At present, most studies focus on the performance of plastic materials, however, the dimension optimizationSeveral dimension factors were taken into consideration including the side length, rib thickness, the, 12 cm top slab,18 cm side length and 6 cm rib thickness is recommended, additionally, an external dimension

Keywords： honeycomb structure plastic pavement dimension optimization mechanical response factor significance

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Understanding of a New Generation of Intelligent Manufacturing based on RAMI 4.0

Zhao Min

Strategic Study of CAE 2018, Volume 20, Issue 4, Pages 90-96 doi: 10.15302/J-SSCAE-2018.04.015

Abstract:

In order to gain a deeper understanding of the significance of the Chinese Academy of Engineering's "China Intelligent Manufacturing Development Strategy Research Report Based on the New Generation of Artificial Intelligence", the author adopts the method of deconstruction and reconstruction, to analyze the Reference Architecture Model of Industrial 4.0 (RAMI 4.0) of Germany, and compared with the general architecture of intelligent manufacturing proposed in the report of the Chinese Academy of Engineering, and similarities and differences of each other are found. It is believed that the general architecture of the intelligent manufacturing in China is superior in intelligence. This is the Chinese contribution to the development of intelligent manufacturing. At the same time, the analysis deepens the understanding of the both architectures.

Keywords： cyber-physics system (CPS) basic paradigm new-generation artificial intelligence architecture technical dimension organizational dimension value dimension