Doctoral thesis Engineering mechanics

There were only limited researches on the properties of 3D periodic cellular materials, especially for 3D periodic cellular materials with Schwarz primitive structure which have potential to be used for energy absorption. The objective of this study is to investigate the energy absorption, compressive strength and deformation pattern of the 3D periodic cellular materials with Schwarz primitive structure, which possesses optimum bulk modulus. The study is planned to provide these important research issues of such 3D cellular materials for energy absorption applications.

77p runthenight04 02-02-2023 5 2   Download

The thesis "Strain Localization and Member Ductility" primarily intends to provide new insights into the mechanism of localized plastic strain, also known as necking, in different types of metallic materials, including mild steel Q235, high strength low alloy steel HSLA350, and aluminum alloy AL6061.

354p runordie3 06-07-2022 8 2   Download

Building models, setting up dynamic equations, vibration equations of vertical band saw blades, surveying dynamic equations, determining some optimal parameters of vertical band saws in automatic sawing lines, to improve productivity and product quality.

27p closefriend09 16-11-2021 24 4   Download

The motivation to study the topics presented in the thesis comes from the analysis of published literatures, and from the evaluation of the application potential of composite material structures and intelligent optimization methods, especially the reliability-based optimization methods.

136p gaocaolon12 18-06-2021 21 4   Download

The influence of some structural factors and utilisation conditions on traction-gripping capacity and stability is determinated to improve working effeficiency of the rubber-tired agrimotor system assembled with a twogang disc plow working on steep terrain.

27p gaocaolon12 18-06-2021 24 4   Download

The research objectives of the thesi: Manufacturing biochar (BC) and activated carbon from coffee husk; Fabrication of biochar/activated carbon composite materials from coffee husk and MnFe2O4 nanomaterials to treat Cr(VI) and Ni(II) ions in water. Clarifying adsorption mechanism and heavy metal ion adsorption model on VLHP from coffee husk.

26p extraenglish 24-05-2021 19 3   Download

Objective: This dissertation explores the influence of pectoral fin structures at different swimming modes on a robotic fish's locomotion behavior; Some objectives are addressed to achieve the mentioned aim as follows: Firstly, new designs based on bio-inspired pectoral fin types are constructed. Secondly, to describe fin deformation and body part movement, novel dynamically mathematical models are developed.

28p extraenglish 26-05-2021 26 5   Download

The object of this thesis is to propose some beam models for static, buckling and vibration analysis of functionally graded isotropic and sandwich beams embedded in hygro-thermo-mechanical environments.

216p capheviahe28 01-03-2021 25 3   Download

Luận án này hướng đến việc phát triển một phương pháp số mạnh để giải quyết các bài toán kỹ thuật, và phương pháp phân tích trực tiếp được sử dụng. Phương pháp này yêu cầu một thuật toán tối ưu hiệu quả và một công cụ rời rạc thích hợp. Mời các bạn cùng tham khảo.

174p capheviahe28 01-03-2021 13 4   Download

In this research, the isogeometric finite element method is used to discretise the displacement domain of strutures in the first step. The primal-dual algorithm based upon the von Mises yield criterion and a Newton-like iteration is used in the second step to solve optimization problem.

157p capheviahe28 01-03-2021 7 2   Download

Equivalent inclusion approach is then developed to account for possible diversions, such as non-idealistic geometric forms of the inhomogeneities, imperfect matrix-inclusion contacts, filler dispersions, and when the particular values of the fillers’ properties are unspecified, using available numerical or experimental reference conductivity data for particular composites.

28p capheviahe27 23-02-2021 25 4   Download

The main objective of the thesis is to provide general methods to control oscillation based on measurement of energy flow, namely: Find the optimal solution for passive control systems based on energy flows; propose the semi-active control algorithms to control the energy flow.

27p capheviahe27 23-02-2021 20 3   Download

The aims of this study are to develop and apply the method of using frequency response functions to diagnose cracks in elastic bar and beams structure. The contents of the study includes: building models of cracked elastic bar and 3 beams structure; studying the changes of oscillation parameters, mainly frequency response functions due to cracks.

27p larachdumlanat129 20-01-2021 23 6   Download

The dissertation aims to study to reduce torsional vibration for the shaft The machine is equipped with DVA (dynamic vibration absorber) oscillator, mass disk type - spring - viscous. To know more details of the content please refer to the thesis summary.

32p xacxuoc4321 11-07-2019 27 3   Download

This thesis aims to develop finite element models for studying vibration of FGM porous beams in thermal environment under moving loads. Both analytical method and finite element analysis are employed in the thesis. The analytical method is used to derive equations of motion for the beam, and the finite element method is then employed to solve the governing equations and to determine the dynamic characteristics of the beams.

28p xacxuoc4321 09-07-2019 37 7   Download

Objective of the thesis For the purpose of building a model of electrical generator for sea wave energy, the device operates efficient and in suitable to Vietnam's sea condition; determining the optimal damping coefficient of the generating motor, model parameters to received the maximum output power; design, fabrication of the electrical generator with the output voltages are 12 VDC, 220 VAC frequency 50 Hz and pure sine wave.

27p xacxuoc4321 08-07-2019 45 6   Download