Kết quả thực nghiệm và mô phỏng cho thấy: tại vị trí kẹp gần mối hàn nhất thì kết quả biến dạng là nhỏ nhất, tại vị trí kẹp 2 bên thì kết quả biến dạng là nhỏ nhất đối với mối hàn đấu mí, tại vị trí kẹp ở giữa và vị trí kẹp 2 bên thì vị trí kẹp 2 bên kết quả biến dạng nhỏ nhất.

 22 p hcmute 25/07/2019 443 3 Download

Trong nghiên cứu này, mối hàn giáp mí hai tấm hợp kim nhôm 5083 với chiều dày 3.0 mm được nghiên cứu chế tạo và thử nghiệm bằng kỹ thuật hàn ma sát trên máy NTU-FSW

 22 p hcmute 25/07/2019 487 2 Download

Việc thực hiện luận văn này bao gồm ba việc chính. Đầu tiên, các thông số của model CNN được huấn luyện bằng cách sử dụng dữ liệu thu thập được từ một xe mô hình tỉ lệ 1/10, gắn máy tính Raspberry Pi 3 Model B và một camera ở phía trước. Dữ liệu dùng để huấn luyện mạng là hình ảnh đường đi và góc lái đồng bộ với thời gian thu thập lúc...

 22 p hcmute 25/07/2019 589 11 Download

Electrical discharge machining (EDM) process is widely used to process hard mmaterials in the industry. The process of electrical discharge is changed and called PMEDM when alloy powder is added in the oil dielectric. In the current study, the effect of tungsten carbide alloy powder added in the dielectric on the surface roughness (Ra) and the micro hardness of surface (HV) status of the workpiece SKD61 after machining is investigated. Studies...

 9 p hcmute 07/06/2019 503 11 Download

The main focus of this paper are prosess parameters in powder mixed electrical discharge machining (PMEDM) have been optimized by Topsis method. Material removal rate (MRR), surface roughness (SR) and micro-hardness of machined surface (HV) in electrical discharge machining with powder mixed into fluid dielectric of die-steels were optimized simultaneously by Taguchi - Topsis method.

 10 p hcmute 07/06/2019 502 3 Download

This article presents preliminary investigations on the cutting ability of the singer layer metal-bonded cBN grinding wheel manufactured by electroplating method at Vietnamese laboratory. The cutting ability of the grinding wheel is evaluated by two factors: grinding ratio G and surface roughness of workpiece. These results are compared to those of the Japanese grinding wheels. The experimental results showed that the fabricated cBN grinding...

 8 p hcmute 07/06/2019 392 2 Download

This paper presented vibration analyses of a tapered composite thin-wall box beam with rectangular section. In the numerical results, the effects of taper angle on natural frequencies and the corresponding mode shapes, transient responses of the beam were considered. The algorithm and Matlab code using nine nodded rectangular isoparametric plate element with five degree of freedom per node developed to solve the problems.

 9 p hcmute 07/06/2019 471 2 Download

Aeroelasticity on airplance wing has a significant on the efficiency and the safety of a flight. Therefore, the study of aeroelasticity problems is a great attention in wing design process. To analyze this, three primary subjects of aeroelastic phenomena that the examination has to focus on, which are wingtip oscillation amplitude, flutter frequency and critical flutter velocity of the wing

 8 p hcmute 07/06/2019 352 2 Download

This paper aims to estimate the effect of turbulent inlet flow to vortices on Delta wing with four different turbulence intensity from 0,5% to 15% and the effect of taper ratio to aerodynamic charateristics of Delta wings with different taper ratio from 0 to 0.7.

 7 p hcmute 07/06/2019 478 3 Download

This research focus on analysing the feasibility of applying the optimization method to the propeller selection. The basic design process is modelled as a constrained optimal problem. The objective function ( propeller performance ) is optimized subjected to constraints imposed by cavitation, required propeller thrust and available engine power

 8 p hcmute 07/06/2019 273 2 Download

Many researches have shown that tool-path time accounted for an average of 70% of the total production time in sheet metal punching. In this paper, the authours present simple but efficient approach to determine the optimun sequence in CNC punching manufacturing. The simulated annealing and dynamic programming are used to solve this problem.

 10 p hcmute 07/06/2019 482 3 Download

Most of types of laser distance measuring instrument cost hundreds of thousand dollars such as Atos scanner or Depth Camera that gives depth maps of space very fast. However, the handling is too complicated for non-professional users and the utilization of 3D reconstruction is very limited. This paper introduces a workflow of 3D reconstruction using a new cheaper instrument, the Microsoft Kinect. The first experiences with Microsoft Kinect v2...

 9 p hcmute 07/06/2019 305 3 Download