19 Result(s)
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Article
Image encryption based on a fractional-order hyperchaotic system and fast row-column-level joint permutation and diffusion
Integer-order hyperchaotic image encryption has demonstrated significant potential in ensuring image security. Recent research suggests fractional-order hyperchaotic systems typically exhibit superior chaotic ...
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Article
Nonlinear Dynamics of an All-Movable Rudder System with Freeplay Nonlinearity
The freeplay nonlinearity will reduce the supporting stiffness of the rudder system, affect the accuracy of the position control and reduce its response speed. These set obstacles to modal parameters identific...
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Article
A new type of low-stress flexible hinge displacement amplifying mechanism
A new type of low-stress flexible hinge displacement is designed to effectively improve the load capacity of flexible hinge position transfer large mechanisms and voltage ceramic output displacement. The princ...
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Article
Intelligent layout optimization of reconfigurable flexible fixture for assembling multiple aircraft panels
The traditional assembly of aircraft panels mainly adopts special welding fixtures, which cannot meet the needs of timely production and delivery of diversified products. To address this problem, this paper de...
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Article
Open AccessA review on cutting tool technology in machining of Ni-based superalloys
In this paper, a state-of-the-art review on cutting tool technology in machining of Ni-based superalloys is presented to better understand the current status and to identify future directions of research and d...
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Article
Anti-corrosion wood automatic sorting robot system based on near-infrared imaging technology
To implement the discovery of discarded anti-corrosion wood, an automatic sorting robot system was built. Three kinds of commonly used wood were selected as the research object, which uses hyperspectral imagin...
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Article
Six-dimensional B-spline fitting method for five-axis tool paths
Piecewise linear segments (presented by a sequence of G01 G-Codes) are the widely adopted tool path format for five-axis computer numerical control (CNC) machining. Nevertheless, the G01 tool path has only G0 con...
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Article
Intelligent configuring for agile joint jig based on smart composite jig model
Agile joint jig (AJJ) is a novel and promising reconfigurable assembly jig, which is put forward to deal with the disadvantages of traditional dedicated assembly jig in aerospace industry. For AJJ design, it i...
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Article
Three-axis CNC machining feedrate scheduling based on the feedrate restricted interval identification with sliding arc tube
In the computer numerical control (CNC) machining for free form surfaces, the time-optimized and smooth feedrate profile plays an essential role in the high-speed and high-precision machining. For the traditio...
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Article
An automated reconfigurable flexible fixture for aerospace pipeline assembly before welding
In order to improve assembly quality and efficiency, reduce reliance on operators’ experience and skills, and satisfy diversified assembly requirements, an automated reconfigurable and flexible assembly fixtur...
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Article
Spiral tool path generation based on symbolic computation for machining of non-axisymmetric curved surface
Bent mandrel, which consists of non-axisymmetric curved surface (NACS), has been widely used as precise mold in automobile industry, ship** industry, and aviation industry. To improve the versatility and eff...
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Article
Finite element analysis of multi-wire saw silicon rods with consolidated abrasive diamonds
A cutting model is presented in the paper for multi-wire saw silicon rods with consolidated abrasive diamonds. The stress of single diamond particles is analyzed. Besides, the calculation formula of normal and...
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Article
Formation mechanism of adhering powder and improvement of the surface quality during laser solid forming
Laser solid forming (LSF) is a promising manufacturing technology. During the LSF process, the adhering powder has a significant impact on the surface quality of the laser solid forming part. In this study, th...
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Article
Parameter tuning method for dither compensation of a pneumatic proportional valve with friction
In the practical application of pneumatic control devices, the nonlinearity of a pneumatic control valve become the main factor affecting the control effect, which comes mainly from the dynamic friction force....
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Article
Development of powder flow model of laser solid forming by analysis method
Laser solid forming (LSF) is a promising additive manufacturing technology. Powder flow plays an important role during the LSF process. In this study, based on the flux balance and the introduction of specific...
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Article
Time-optimal interpolation for five-axis CNC machining along parametric tool path based on linear programming
In this paper, the time-optimal velocity planning problem for five-axis computer numerical control machining along a given parametric tool path under chord error, acceleration, and jerk constraints is studied....
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Article
Interpolation of parametric CNC machining path under confined jounce
Aiming at reducing the computer numerically controlled (CNC) machining vibration and increasing machining quality, an interpolation method for parametric tool paths with confined jounce, jerk, acceleration, an...
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Article
A nonlinear dynamic macro-element for demand assessment of bridge substructures subjected to ship collision
For the dynamic demand assessment of bridge structures under ship impact loading, it may be prudent to adopt analytical models which permit rapid analysis with reasonable accuracy. Herein, a nonlinear dynamic ...
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Article
Calculation method of ship collision force on bridge using artificial neural network
Ship collision on bridge is a dynamic process featured by high nonlinearity and instantaneity. Calculating ship-bridge collision force typically involves either the use of design-specification-stipulated equiv...
