ACO-Based Holes Machining Path Optimization Using Helical Milling Operation

2013 ◽  
Vol 834-836 ◽  
pp. 1386-1390
Author(s):  
Zhong Qun Li ◽  
Xin Wang ◽  
Ya Feng Dong
Keyword(s):  
Path Optimization ◽  
Helical Milling ◽  
Aircraft Industry ◽  
Metal Compounds ◽  
Milling Operation ◽  
High Efficient ◽  
Optimization Simulation ◽  
Hole Making ◽  
New Type ◽  
Simulation Results

As a new-type, high efficient hole-making technology, helical milling is widely used in making holes on composites and composite-metal compounds materials in the aircraft industry. In this paper, the problem of machining path optimization using helical milling is converted to a TSP (Traveling Salesman Problem), a mathematical model is established and solved using ACO (Ant Colony Optimization). Simulation results show that with the application of ACO, the traveling efficiency of helical milling has been increased by 41.1%.

Surface Roughness Model for Helical Milling of Die-Steel Based on Response Surface Methodology

2010 ◽  
Vol 431-432 ◽  
pp. 346-350 ◽  
Author(s):  
Xu Da Qin ◽  
Song Hua ◽  
Xiao Lai Ji ◽  
Shi Mao Chen ◽  
Wang Yang Ni
Keyword(s):  
Surface Roughness ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Axial Direction ◽  
Helical Milling ◽  
Design Parameters ◽  
Die Steel ◽  
Roughness Model ◽  
Milling Operation ◽  
Hole Making

Holes making process is widely applied in die steel machining, Helical milling a hole, also called orbital drill, is hole making process by milling in which the center of end mill orbits around the center of the hole while spinning on its axis and moving in the axial direction. The paper presents the secondary regression prediction model of the holes surface roughness for helical milling of die-steel. To minimize the number of experiments for the design parameters, response surface methodology (RSM) with orthogonal rotatable central composite design is used. By means of variance analyses and additional cutting experiments, the adequacy of this model is confirmed. The model will be helpful in selecting cutting conditions to meet surface finish requirements in helical milling operation.

Experimental Study of Helical Milling on CFRP (Carbon Fibre Reinforced Polymer) for the Hole Making Process

2012 ◽  
Vol 576 ◽  
pp. 68-71 ◽  
Author(s):  
Erween Abdul Rahim ◽  
Zazuli Mohid ◽  
M.F.M. Jamil ◽  
K.C. Mat ◽  
R. Koyasu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Milling Process ◽  
Tool Design ◽  
Fiber Reinforced Polymer ◽  
Helical Milling ◽  
Reinforced Polymer ◽  
Milling Operation ◽  
Carbon Fibre Reinforced Polymer ◽  
Hole Making ◽  
Fibre Reinforced Polymer

Generate borehole by helical milling process may be used effectively since accurate location of the hole may be secured by means of the feed screw graduations. Fiber delamination which is the main defect occurred during hole making process on carbon fiber reinforced polymer (CFRP) were investigate throughout an experimental study. Effects of thrust force (Fz), delamination factor (Fd) and surface roughness are evaluated. Objective of the experiment are to find best cutting parameter and tool design suitable to performed helical milling operation on CFRP. Two types of end mill with 4 flutes were used and results are evaluated. It was found that tool design 2-1 has higher performance on CFRP.

Design Optimization of Autoswitch Hydrogen Absorption and Desorption Device Using Metal Hydrides

2017 ◽  
Vol 15 (6) ◽  
Author(s):  
Ceng He ◽  
Yuqi Wang ◽  
Jing Song ◽  
Shanshan Li ◽  
Fusheng Yang ◽  
...  
Keyword(s):  
Metal Hydride ◽  
Cycle Time ◽  
Single Cycle ◽  
Desorption Process ◽  
Operation Conditions ◽  
Time Simulation ◽  
Structure Improvement ◽  
New Type ◽  
Simulation Results ◽  
Desorption Cycle

Abstract Metal hydride is an influential and promising material for hydrogen utilization. Researchers have carried out a large number of studies on hydrogen storage apparatus, and developed a few new devices for its promotion. Unfortunately, for most metal hydride reactors, the hydrogenation and dehydrogenation are two independent processes owing to the different required conditions, which could cause many inconveniences and safety problems to the H2 absorption & desorption cycle with high frequency and intensity. Hence we proposed a new type of autoswitch H2 absorption & desorption device based on the structure improvement, which consists of rotation disc, fixed disc and the reactor. The numerical simulation for H2 absorption/desorption using LaNi5 was accomplished, and the optimizations on both structure and operation conditions were achieved within a certain period of cycle time. Simulation results show when the single cycle time is set to 1600 s, the absorption temperature has to be lower than 45 °C (3 MPa) and pressure higher than 1.28 MPa (20 °C), and the desorption temperature should be higher than 41 °C (0.1 MPa) and pressure lower than 0.48 MPa (80 °C) under the same cycle time. Meanwhile, the effects of reaction finish time, operating temperature and H2 pressure during absorption/desorption process was investigated and simulation data were also fitted to develop the structural optimization. Under the hydrogenation/dehydrogenation conditions of 3 MPa (20 °C)/0.1 MPa (80 °C), the simulation results indicate the optimal initial reacted fraction and total cycle time are 0.07 and 1287 s, respectively. Moreover, both structures of autoswitch device with 4 and 6 openings have been optimized to satisfy the requirement of each stage. The autoswitch H2 absorption & desorption device can realize the automatic switch between hydrogenation and dehydrogenation orderly and controllably, which would provide convenience for the occasions with this demand and show its remarkable value during popularization and application.

Study on Impact Properties of New Hydro-Pneumatic Buffer for a Metro Vehicle

2014 ◽  
Vol 978 ◽  
pp. 94-100
Author(s):  
Yi Ping Li
Keyword(s):  
Buffer Capacity ◽  
Characteristic Curve ◽  
Simulation Method ◽  
Static Characteristic ◽  
Railway Vehicle ◽  
Longitudinal Impact ◽  
Dynamics Model ◽  
New Type ◽  
Simulation Results ◽  
Buffer Structure

Analyzed and studied the hydro-pneumatic buffer structure of railway vehicle, designed a new type of hydro-pneumatic buffer and established the detailed dynamics model. Calculated the static characteristic curve of hydro-pneumatic buffer with different compression rate and dynamic characteristic curve with different impact speed through the numerical simulation method. The simulation results shows that the biggest impedance force is 1836.3KN and buffer capacity reach 221.89KJ when impact velocity of the new hydro-pneumatic buffer is 5m/s.New hydro-pneumatic buffer can improve the speed of manipulating vehicle, reduce the longitudinal impact and vibration in the train and adapt to the needs of the trains.

Design for New Actuator Based on Electroactive Polymer

2013 ◽  
Vol 579-580 ◽  
pp. 804-807
Author(s):  
Zhong Yao Wu ◽  
Tian Feng Zhao ◽  
Jian Bo Cao ◽  
Shi Ju E ◽  
Chun Xiao Chen
Keyword(s):  
Polymer Material ◽  
Dielectric Elastomer ◽  
Optimal Performance ◽  
Electroactive Polymer ◽  
Good Prospect ◽  
Broad Application ◽  
Design Scheme ◽  
New Type ◽  
Simulation Results ◽  
Application Prospects

Dielectric elastomer is a kind of electroactive polymer material with optimal performance. As actuator material, dielectric elastomer has shown a good prospect. Based on studying the principle of electroactive polymer, a new type of cylindrical actuator was designed. Its 3-D figure and 2-D dimension drawing was finished by UG software. The animation simulation of the actuator was studied. The simulation results verified the feasibility of design scheme. Electroactive polymer will have broad application prospects in the field of actuator.

A New Type of High Efficient LGM Vertical Mill

2009 ◽  
Author(s):  
Qian Wang ◽  
Ruiqing Jia ◽  
Xu Zhong ◽  
Hongwei Shi ◽  
Ailin Zhang
Keyword(s):  
High Efficient ◽  
New Type

Self-Collimation in Square Lattice Two Dimensional Photonic Crystals with Ring-Shaped Holes

2011 ◽  
Vol 110-116 ◽  
pp. 1024-1029
Author(s):  
Quan Xu ◽  
Kang Xie ◽  
Hua Jun Yang
Keyword(s):  
Photonic Crystals ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Square Lattice ◽  
Surface Modes ◽  
Input Surface ◽  
High Efficient ◽  
Integrated Optical ◽  
New Type ◽  
Efficient Coupling

We demonstrate self-collimation phenomena based on a new type of photonic crystals made of square lattice with ring shaped holes. The plane wave expansion (PWE) method is used to get the three dimensional band diagram and equi-frequency of the second band which displays the self-collimation phenomena for the structure we proposed in this paper. The collimation angle is mainly depending on the maximum flatness half width (MFHW) of the equi-frequency. The FDTD method is employed to demonstrate the electric field amplitude distributions for the collimation phenomena. Partly, in order to achieve high efficient coupling of the input and output port, we modify both surface structures to modulate the wave-front to obtain desired effect. The parameter of the input surface is modified which will prevent the production of surface modes which takes away the EM power and enhance the transmittance. For a square lattice with the modified parameters at each side of the input surface, the surface modes are suppressed to couple with the continuum of the dielectric waveguide modes. More importantly, they might have potential application in integrated optical circuits.

Stiffness Performance Simulation and Testing of a New Type Integrated Suspension Strut

2012 ◽  
Vol 472-475 ◽  
pp. 2760-2765
Author(s):  
Hao Bin Jiang ◽  
Ying Jun Du ◽  
Shen Chen Ye
Keyword(s):  
Mathematical Model ◽  
Fluid Mechanics ◽  
Vertical Vibration ◽  
Bench Test ◽  
Test Results ◽  
Performance Simulation ◽  
Body Roll ◽  
New Type ◽  
Simulation Results ◽  
Stiffness Characteristics

The design scheme of a new type strut was put forward, whose stiffness characteristics can undertake linkage control. The structure and basic principle of this new suspension component were introduced. According to fluid mechanics and thermodynamics, a mathematical model for the stroke dependent stiffness characteristics of the strut was established, and the stiffness characteristics were analyzed by using software SIMULINK. Then the stiffness performance bench test of the strut specimen was carried out for verification. Results show that the test results agree well with the simulation results. It is verified that the established mathematical model is correct and the stiffness of this strut shows nonlinear changes vary with the displacement of piston. When the suspension is largely impacted, the stiffness of this strut increases quickly which could restrain the wheel bouncing, body roll and vertical vibration.

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