Data Mining Practical Machine Learning Tools and Techniques

INTRODUCTION TO COMPOSITE MATERIALS Chapter Objectives Introduction Classi?cation Recycling Fiber-Reinforced Composites Mechanics Terminology Summary Key Terms Exercise Set References MACROMECHANICAL ANALYSIS OF A LAMINA Chapter Objectives Introduction Review of De?nitions Hooke's Law for Different Types of Materials Hooke's Law for a Two-Dimensional Unidirectional Lamina Hooke's Law for a Two-Dimensional Angle Lamina Engineering Constants of an Angle Lamina Invariant Form of Stiffness and Compliance Matrices for an Angle Lamina Strength Failure Theories of an Angle Lamina Hygrothermal Stresses and Strains in a Lamina Summary Key Terms Exercise Set References APPENDIX A: MATRIX ALGEBRA Key Terms APPENDIX B: TRANSFORMATION OF STRESSES AND STRAINS Transformation of Stress Transformation of Strains Key Terms MICROMECHANICAL ANALYSIS OF A LAMINA Chapter Objectives Introduction Volume and Mass Fractions, Density, and Void Content Evaluation of the Four Elastic Moduli Ultimate Strengths of a Unidirectional Lamina Coefficients of Thermal Expansion Coefficients of Moisture Expansion Summary Key Terms Exercise Set References MACROMECHANICAL ANALYSIS OF LAMINATES Chapter Objectives Introduction Laminate Code Stress-Strain Relations for a Laminate In-Plane and Flexural Modulus of a Laminate Hygrothermal Effects in a Laminate Summary Key Terms Exercise Set References FAILURE, ANALYSIS, AND DESIGN OF LAMINATES Chapter Objectives Introduction Special Cases of Laminates Failure Criterion for a Laminate Design of a Laminated Composite Other Mechanical Design Issues Summary Key Terms Exercise Set References BENDING OF BEAMS Chapter Objectives Introduction Symmetric Beams Nonsymmetric Beams Summary Key Terms Exercise Set References INDEX

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Mechanics of composite materials

3D meso-scale fracture modelling and validation of concrete based on in-situ X-ray Computed Tomography images using damage plasticity model

Generation of 3D representative volume elements for heterogeneous materials: a review

Independence-oriented VMD to identify fault feature for wheel set bearing fault diagnosis of high speed locomotive

The application of multiple control surfaces is a potential method in active aeroelastic control. The placement of a control surface has great impact on the aeroelastic control performance. How to determine the placement of a control surface is a very important task in active controller design. Based on the proper orthogonal decomposition method, an aeroservoelastic reduced order model suitable for placement optimization in transonic flow was developed. Then a two-step aeroelastic optimization method based on the genetic algorithm was proposed to search the optimal placements of control surfaces. The modified Goland+ wing configuration with four aerodynamic control surfaces was applied to demonstrate the proposed placement optimization method. The simulation results show that the optimized configuration improves the aeroelastic control performance obviously and suppresses the limit cycle oscillation successfully with good performance.

Reduced-order-model-based placement optimization of multiple control surfaces for active aeroelastic control

With the in-depth integration of traditional industries and information technology in Internet of things, wireless sensor networks are used more frequently to transmit the data generated from various application scenarios. Structural health monitoring is a scene that requires recurrent data transmission in Internet of things, and the wireless sensor networks in Internet of things not only have storage and communication capabilities, but also have computing capabilities. Therefore, the demand for intelligent and decentralized data exchange between them has increased significantly which brings challenges with respect to low data reliability, chaotic data circulation, provenance tracking, and data accountability investigating, threatening the data security of structural health monitoring in Internet of things utilization. In this article, we propose a controllable data transmission mechanism based on the consortium blockchain to content the requirements of the Internet of things scenario. We identify a version-based, fine-grained, and privacy-protected data structure and propose the corresponding smart contracts for our mechanism to ensure the trusted data transmission. To prove the feasibility of our mechanism, a prototype system is implemented based on the Hyperledger Fabric, an open-source consortium blockchain framework. Our experimental results show in practice the usability and scalability of the approach in this article.

A controllable privacy data transmission mechanism for Internet of things system based on blockchain

Analytical solutions for limit loads of simply supported conical shells under internal pressure with unified yield criterion

In this paper, the dynamic response and sound radiation of sandwich plate subjected to an acoustic excitation under thermal environment are analyzed. The thermal environment is a uniform temperature load. Thermal stress is considered as the membrane force in the plate, while the change of the material property due to the thermal load is ignored. The acoustic excitation applied on the sandwich plate is assumed to be a plane wave. Coupling of the structural vibration and acoustic medium is considered. The equivalent non-classical theory, which takes the effects of rotational inertia and shear deformation into account, is utilized to get the analytical solutions. The effects caused by thermal environment and acoustic excitation are discussed. It is found that the rise of thermal load decreases the natural frequencies and moves response peaks to the low-frequency range. The acoustic excitation doesn’t influence the natural characteristics of the sandwich plate, but the incident angle is relative to the number of evident peaks on the response curve. The comparisons of the analytical results and those computed by VA one show the accuracy of the theoretical method.

Analyses of dynamic response and sound radiation of sandwich plate subjected to acoustic excitation under thermal environment

This paper carries out the structural topology optimization to minimize the radiated acoustic power in a thermal environment for the first time. The stress induced by the thermal environment which can reduce the stiffness of the structure, thus changing its radiation property and optimal design. An approach to investigate this effect is presented through studying a baffled bi-material plate. The plate is excited by a harmonic load and subjected to a uniform temperature rise. The thermal stress is first evaluated and considered as pre-stress in the structural dynamic analysis. With the dynamic response, the acoustic power can be obtained using Rayleigh integral. Sensitivity analysis with respect to the design variables is calculated according to the material interpolation model. Some typical cases are studied; the thermal environment is below the critical buckling temperature and the driving frequency is lower than the plate’s second natural frequency. Numerical results show that the natural frequencies decrease with the increase of the temperature and the structure tends to resonance; thus the radiated sound power level becomes higher and the pattern of the optimal topology resembles that of the associated mode shape more closely. The sound power level of the optimal plate becomes lower than that of the initial plate, especially for the higher temperature cases. During the optimization process, the critical buckling temperature increases and the structure is always in pre-buckling.

Yueming Li

Papers

Reduced-order-model-based placement optimization of multiple control surfaces for active aeroelastic control

A controllable privacy data transmission mechanism for Internet of things system based on blockchain

Analytical solutions for limit loads of simply supported conical shells under internal pressure with unified yield criterion

Analyses of dynamic response and sound radiation of sandwich plate subjected to acoustic excitation under thermal environment

Topology Optimization of a Bi-Material Plate with Respect to Sound Radiation in a Thermal Environment