Modern Mechanical Engineering

Journal Information
ISSN / EISSN : 21640165 / 21640181
Current Publisher: Scientific Research Publishing, Inc. (10.4236)
Total articles ≅ 156
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Latest articles in this journal

Aslain Brisco Ngnassi Djami, Wolfgang Nzié, Serge Doka Yamigno
Modern Mechanical Engineering, Volume 10, pp 1-16; doi:10.4236/mme.2020.101001

Abstract:
In order to help designers, consider disassembly in their design activities, a method for evaluation of product disassembly is proposed. Criteria characterizing the disassembility of a product are identified. Each criterion is assigned a coefficient, thus proposing an index of easy fixations (Iff) as a design indicator to evaluate the level of disassembly of a solution generated by the designer. This index is calculated as a weighted average of the indicators for evaluating the disassembility of the product. The proposed method uses information such as the list of subsets or parts, the component tree, the part geometry, the functional links between components and parts, the properties of the components. It has been tested on one product: the soy roaster.
Louis Okotaka Ebale, Guy Dieudonne Moukandi N’Kaya, Wilfrid Kombo, Feldha Kibongani
Modern Mechanical Engineering, Volume 10, pp 17-24; doi:10.4236/mme.2020.102002

Zheng Jingyuan
Modern Mechanical Engineering, Volume 10, pp 34-38; doi:10.4236/mme.2020.103004

Abstract:
In this paper, we established a time-dependent model that investigates the migration behavior of a millimeter-scale liquid droplet on a solid surface with temperature gradient. Both fluid mechanics and heat transfer are incorporated in the model. The Navier-Stokes equation is employed both inside and outside the droplet. Size variation is observed in the transient simulation. Results show that the velocity of the migration is about 1.7 mm/s under a temperature gradient of 30 K/mm. The model is consistent with results with previous literatures.
Haotian Yan
Modern Mechanical Engineering, Volume 10, pp 39-49; doi:10.4236/mme.2020.103005

Abstract:
In this paper, we use Port-Hamiltonian framework to stabilize the Lagrange points in the Sun-Earth three-dimensional Circular Restricted Three-Body Problem (CRTBP). Through rewriting the CRTBP into Port-Hamiltonian framework, we are allowed to design the feedback controller through energy-shaping and dissipation injection. The closed-loop Hamiltonian is a candidate of the Lyapunov function to establish nonlinear stability of the designed equilibrium, which enlarges the application region of feedback controller compared with that based on linearized dynamics. Results show that the Port-Hamiltonian approach allows us to successfully stabilize the Lagrange points, where the Linear Quadratic Regulator (LQR) may fail. The feedback system based on Port-Hamiltonian approach is also robust against white noise in the inputs.
Sun Chunhua, Shang Guangqing
Modern Mechanical Engineering, Volume 10, pp 25-33; doi:10.4236/mme.2020.103003

Abstract:
Different from reduction manufacturing and equal manufacturing, 3D printing is an additive manufacturing method, which transforms 3D model into 2D cross-section data to form entity layer by layer. This makes its processing not limited by complexity of the design model and number of the manufacturing products. It is very suitable for the medical field with high customization requirements. In fact, application of 3D printing technology in the medical field is particularly noticeable. In this paper, application and development of 3D printing technology are reviewed in medical model, rehabilitation equipment, tissue engineering, medical hygiene materials, lab-on-chip. Its applications include medical education, surgical planning, prosthesis customization, tissue culture and biosensor manufacturing and so on. Its wide application is due to its digital model, which makes the whole manufacturing process easier to digitize, so it is more conductive to updating and customization of products via 3D printing.
Haoze Tang
Modern Mechanical Engineering, Volume 9, pp 20-29; doi:10.4236/mme.2019.91003

Abstract:
In this paper, we use a Circle Restricted Three-Body Problem (CRTBP) to simulate the motion of a satellite. Then we reformulate this problem with the controller into the description using Koopman eigenfunction. Although the original dynamical system is nonlinear, the Koopman eigenfunction behaves linearly. Choosing Jacobi integral as the Koopman eigenfunction and using the zero velocity curve as the reference for control, we are allowed to combine well-developed Linear Quadratic Regulator (LQR) controller to design a nonlinear controller. Using this approach, we design the low thrust orbit transfer strategy for the satellite flying from the earth to the moon or from the earth to the sun.
Wentao Yong
Modern Mechanical Engineering, Volume 9, pp 13-19; doi:10.4236/mme.2019.91002

Abstract:
With the invention of the aircraft, it has become much faster and larger than the original Wright Brothers aircraft. When the speed is high enough to cross the speed of sound, air conditions will be different than that in low speed due to the existence of shock wave. In this work, we introduce several numerical ways to analyze the performance of the airfoil when the speed is higher than the speed of sound. With these numerical methods, we analyzed the performance of diamond-shaped airfoil under different angles of attack and speed. With this data, engineers can choose a better airfoil to attain a lower drag coefficient as well as lift coefficient when designing a high-speed aircraft.
Mohammad Al-Smairan, Omar Al-Nhoud
Modern Mechanical Engineering, Volume 9, pp 30-48; doi:10.4236/mme.2019.91004

Abstract:
The utilization of wind energy for power generation purposes is becoming increasingly attractive and gaining a great share in the electrical power production market worldwide. This research was considered a feasibility study of wind energy farm in Bab Al-Hawa, Irbid. The average wind speed in the site is (6.5 m/s). Data have been collected, which includes the average monthly wind speed for 10 years, but by HOMER software to create the hourly wind speed of a representative year is created in order to build Weibull distribution and to calculate the energy generated output of the project. This project contains the construction of 33 wind turbines in 3.11 km square. Each turbine has a capacity of 900 kW rated power and the total rated capacity is 29.7 MW. The capacity factor was found equal to 37.1% which means the amount of utilization of the turbine capacity. The results show that the turbines work 87,286 h/yr, and the total energy generated is 96.548559 GWh/yr. from the 33 wind turbines installed. The initial cost of this project is equal to 80.5243 M$ and the Payback period is 7 years. We have taken into account the environmental impact such as CO2 emissions into consideration. CO2 reductions by using wind energy instead of coal-fired plant are equal to 67124.4 tons, and the CO2 emissions reduction using wind power instead of fuel oil power plant is 5343.4 tons. This research shows that wind farm at Bab Al-Hawa with a capacity of 29.7 MW, 33 wind turbines, 900 kW each has been feasible with a cost of energy 4 cents/kWh.
Zeng Ji, Yuan Bo, Feng Qi, Chen Yan
Modern Mechanical Engineering, Volume 9, pp 49-56; doi:10.4236/mme.2019.92005

Abstract:
The demand for natural gas in the world is increasing day by day. The efficient and flexible LNG becomes the preferred method for natural gas storage and transportation and has gradually entered people’s daily life. The enclosure system is the key core of LNG transport and storage vessels for storage of LNG at -163°C for isolation and thermal insulation. A new type of flat half-film prismatic LNG enclosure system has been developed for the shortcomings of the existing LNG cargo enclosure system. Through the breakthrough and mastery of key core technologies such as the overall layout and integration of the system, anti-leakage technology, liquid tank fixing technology, and large-scale friction stir welding (P-FSW) flat-line pipeline development technology, we’ll strive to fill the gap in the intelligent construction technology of large aluminum alloy tanks in China. The tank was subjected to water vapor test and numerical simulation. The results show that the structural strength of the FSP-LNG tank meets the strength check standard of IGC Code.
Brisco Ngnassi Djami Aslain, Nzié Wolfgang, Doka Yamigno Serge, Aslain Brisco Ngnassi Djami, Wolfgang Nzié, Serge Doka Yamigno
Modern Mechanical Engineering, Volume 9, pp 65-80; doi:10.4236/mme.2019.94007

Abstract:
In order to help designers, consider disassembly in their design activities, a method for evaluation of product disassembly is proposed. Criteria characterizing the disassembility of a product are identified. Each criterion is assigned a coefficient, thus proposing an index of easy fixations (Iff) as a design indicator to evaluate the level of disassembly of a solution generated by the designer. This index is calculated as a weighted average of the indicators for evaluating the disassembility of the product. The proposed method uses information such as the list of subsets or parts, the component tree, the part geometry, the functional links between components and parts, the properties of the components. It has been tested on one product: the soy roaster.
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