Tài liệu Kỹ Thuật - Công Nghệ

Shear strengthening of reinforced concrete beams using epoxy bonded steel plates, cfrp sheets and externally anchored stirrups
Nghiên cứu này trình bày hiệu quả của các phương pháp gia tăng độ cứng chống trượt khác nhau sử dụng thép tấm dán bằng epoxy, các dải thép và các tấm nhựa gia cường bằng sợi carbon (CFRP) và neo bằng các nẹp ngoài để tạo ra độ bền chống trượt cho dầm bê tông cốt thép. Trong công trình này đã tiến hành chương trình thí nghiệm cho hai loạt mẫu với...
8 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 510 | Lượt tải: 0
An efficient numerical procedure for calculating periodic vibrations of elastic mechanisms
In this study, the problem on the calculation of steady-state periodic vibrations of elastic transmission mechanisms is addressed. The differential equations of motion of the mechanism is established and linearized to obtain a system of linear differential equations having time-varying coefficients, known as a parametric vibration system. A num...
11 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 567 | Lượt tải: 0
Turbulent burning velocity in combustion chamber of si engine fueled with compressed biogas
The results of this study allow us to draw the following conclusions: 1. The turbulent burning velocity coefficient of biogas-air mixture in the combustion chamber of a Honda Wave motorcycle engine fueled with compressed biogas containing 85% CH4 is approximately 1.3. 2. The indicated cycle work of a 110cc Honda Wave motorcycle engine reduces 28%...
12 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 434 | Lượt tải: 0
Inverse kinematics of a serial-Parallel robot used in hot forging process
The kinematical model of the serial-parallel robot is formulated. The kinematics equation of the considering robot must satisfy the constraint equation because of the motion constrained of the parallel links. This is different from the typical serial robot. The end-effector moves always parallel with the ground surface that could simplify the c...
8 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 598 | Lượt tải: 0
Improved estimates for the effective elastic bulk modulus of random tetragonal crystal aggregates
In this paper we have derived explicit expressions of the general shape-unspecified upper and lower bounds on the effective elastic bulk modulus of random tetragonal crystal aggregates with numerical illustrations. The estimates are expected to predict the scatter range of the macroscopic elastic property of practical polycrystalline materials. On...
12 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 454 | Lượt tải: 0
Frequency response of a beam-Like structure to moving harmonic forces
The moving load problem for a long time has attracted attention of researchers and engineers in the field of structural engineering and it is so far an actual topic in dynamics of structures. The fundamentals of the problem were formulated in [1–5] and intensively studied in the widespread literature, for example, the references [6–11]. In the m...
16 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 490 | Lượt tải: 0
An analytic homogenization model in traction and bending for orthotropic composite plates with the type of double corrugated cardboard
In this article, we have proposed an analytic homogenization model for the traction and flexion problem of double corrugated core cardboards. The comparison of the results obtained by the analytic formulas, by the Abaqus 3D simulations and by the AbaqusUgens 2D simulations has proved the validation of the present traction and flexion homogenizati...
9 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 546 | Lượt tải: 0
Tính toán động lực học công trình biển cố định hệ thanh không gian chịu tác động của tải trọng sóng và gió với mô hình lý thuyết sóng stoke bậc 2
This paper presents finite element algorithms and dynamic analysis of the jacket type offshore structure under water wave and wind impact by using stoke’s second order wave theory. The result of the paper is the scientific basis for the calculation, design and selection of the appropriate parameters, the study contributes to the optimization of ...
9 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 558 | Lượt tải: 0
Engineering optimization by constrained differential evolution with nearest neighbor comparison
This paper presented the combination of the nearest neighbor comparison, previously used within unconstrained optimization, and the # constrained method for handling constraints and proposed the #DE-NNC for constrained engineering design problem. The performance of #DE-NNC was evaluated by five widely used engineering benchmark design problems. It...
13 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 449 | Lượt tải: 0
Vibration analysis of beams subjected to random excitation by the dual criterion of equivalent linearization
The method of equivalent linearization is one of effective tools in solving random vibration problems of mechanical systems. In this study, the modal responses of a simply supported beam subjected to a space-wise and time-wise white noise loading are carried out by the dual criterion of equivalent linearization. Our calculations are restricted i...
14 trang | Chia sẻ: huongthu9 | Ngày: 11/08/2021 | Lượt xem: 422 | Lượt tải: 0