https://dspace.ctu.edu.vn/jspui/handle/123456789/13 Trung ương Hội KHKT Cơ Khí VN & Hiệp hội Doanh nghiệp Cơ khí VN Wed, 13 May 2026 09:01:14 GMT 2026-05-13T09:01:14Z http://localhost:8080/jspui/retrieve/cdf9dbc8-2d7e-46a2-a464-e2009939d889/01 (29).jpg https://dspace.ctu.edu.vn/jspui/handle/123456789/13 https://dspace.ctu.edu.vn/jspui/handle/123456789/127348 Title: Nghiên cứu ảnh hưởng của góc nghiêng cánh đến sự thay đổi các thông số thủy động của chong chóng tàu thủy bằng phương pháp CFD = Investigation of the influence of rake angle on the hydrodynamic parameters of marine propellers by CFD method Authors: Nguyễn, Văn Quyết; Lê, Thị Mai Abstract: Nghiên cứu sử dụng mô hình CFD k-ω SST để phân tích ảnh hưởng của góc nghiêng cánh (θ) đến hiệu suất chong chóng B-Series. Kết quả cho thấy góc nghiêng tăng làm tăng đáng kể lực đẩy (Kᴛ) và mô-men xoắn (KQ) ở tải trọng cao, nhưng tác động đến hiệu suất (ηₒ) là không đáng kể. Nghiên cứu cung cấp cơ sở dữ liệu định lượng hỗ trợ kỹ sư thiết kế tối ưu lực đẩy, cải thiện hiệu suất chong chóng. Thu, 01 Jan 2026 00:00:00 GMT https://dspace.ctu.edu.vn/jspui/handle/123456789/127348 2026-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/127158 Title: Optimization of total cost of ownership (TCO) of electric vehicles in congested urban environments: A case study in Hanoi, Vietnam = Tối ưu hóa tổng chi phí sở hữu (TCO) của xe điện trong môi trường đô thị tắc nghẽn: Một nghiên cứu trường hợp tại Hà Nội, Việt Nam Authors: Le, Thuong Hien; Nguyen, Thi Tuyen Abstract: This paper presents a comprehensive analysis and optimization of the total cost of ownership (TCO) for electric vehicles (EVs) versus internal combustion engine (ICE) vehicles within Hanoi's unique congested urban environment. A mathematical model incorporating battery degradation under high temperatures, energy consumption variability in stop-and-go traffic, and local incentive policies is developed. Our findings, based on a comparative case study involving popular EV and ICE models, reveal that while initial acquisition costs for EVs remain higher, strategic charging, governmental subsidies, and the inherent inefficiencies of ICE vehicles in heavy congestion contribute to a significantly lower TCO for EVs over a 7-year ownership period. This study provides critical insights for policymakers and consumers in similar developing urban contexts. Wed, 01 Jan 2025 00:00:00 GMT https://dspace.ctu.edu.vn/jspui/handle/123456789/127158 2025-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/127157 Title: Optimizing realtime performance for embedded system in 3 axis dyanometer: A comparision between techniques = Tối ưu hóa hiệu năng thời gian thực cho hệ thống nhúng trong thiết bị đo lực ba thành phần: So sánh giữa các kỹ thuật Authors: Bui, Long Vinh; Nguyen, Ngoc Toan; Dao, Minh Tuan; Do, Hoang Nam; Phan, Quoc Hien; Phan, Dang Hoang Abstract: The highly accurate, high-speed acquisition of cutting force data is a fundamental prerequisite for the real-time monitoring and optimization of machining processes. To date, the predominant focus of research has been on the mechanical design and calibration accuracy of dynamometers, with comparatively limited attention devoted to the optimization of embedded data acquisition architectures. This study addresses this gap by presenting a systematic performance comparison of four distinct data acquisition strategies implemented on a three-axis real-time force measurement system in turning process. The architectures: (i) Polling, (ii) Polling with Interrupts, (iii) a Real-Time Operating System (RTOS) with Interrupts, and (iv) an RTOS with Direct Memory Access (DMA) utilizing a double buffering mechanism were evaluated on an STM32 microcontroller platform integrated with a 24-bit ADC operating at 32 kSPS. Performance was quantitatively assessed based on CPU utilization and sampling rate stability. The empirical results demonstrate that while conventional Polling and Interrupt-driven methods achieve the target sampling rate, they do so at the cost of nearly 100% CPU utilization. The RTOS-Interrupt architecture offered a substantial improvement, reducing the CPU load to approximately 97.51%. Most significantly, the RTOS-DMA configuration demonstrated superior efficacy, achieving an average CPU load time of 87.23% while maintaining high sampling rate stability (33,145.09±36.64 samples/s). These findings validate that the RTOS-DMA architecture provides an optimal balance between high data throughput and computational efficiency. This approach effectively decouples data acquisition from the CPU, thereby enabling parallel execution of critical tasks such as signal processing and communication, establishing it as the most suitable architecture for robust, multi-tasking smart machining monitoring systems. Wed, 01 Jan 2025 00:00:00 GMT https://dspace.ctu.edu.vn/jspui/handle/123456789/127157 2025-01-01T00:00:00Z https://dspace.ctu.edu.vn/jspui/handle/123456789/127156 Title: Development of a cranial molding helmet for infants with flat head syndrome HFS2025 = Phát triển mũ chỉnh hình hộp sọ cho trẻ sơ sinh bị bẹp đầu HFS2025 Authors: Nguyen, Thanh Huy; Tran, Nguyen Duy Phuong; Vu, Viet Hung; Truong, Quoc Thanh; Nguyen, Van Thanh; Nguyen, Cao Minh Khoa Abstract: The paper presents a development for cranial molding helmets tailored to infants with flat head syndrome. The helmet is built using 3D scanning of the infant's head, featuring optimized circular ventilation holes through ANSYS thermal simulation. The prototype molding shell is fabricated through 3D printing technology. By specifically analyzing stress symptoms through heart rate and blood oxygen saturation data, this paper proposes using sounds to reduce infant stress. Wed, 01 Jan 2025 00:00:00 GMT https://dspace.ctu.edu.vn/jspui/handle/123456789/127156 2025-01-01T00:00:00Z