Summary The uncertain spatial variation of material properties can remarkably affect the band gap characteristics phononic crystals (PnCs). It is necessary to consider this issue when designing and manufacturing PnC materials/structures. This paper investigates a robust topology optimization method for microstructures PnCs by considering random‐field properties. Herein, distribution first represented random field then discretized into uncorrelated stochastic variables with expansion optimal...

Software defect prediction is a technology that uses known software information to predict defects in the target software. Generally, models are built using features such as metrics, semantic information, and networks. However, due complex structure small number of samples, without effective feature representation extraction methods, it impossible fully utilize features, which can easily lead misjudgments reduced performance. In addition, single cannot characterize structure. Therefore, this...

The kinematic parameters of camera robot are described by Unified Robot Description Format (URDF). Compared to Denavit-Hartenberg (DH) method, URDF is more flexible. But DH method has an advantage in inverse solution control at position level. Sometimes only file can be obtained due the engineering project requirements, such as modularity and security. It easy convert URDF. There a lack research for conversion. In this paper, three conversion principles were proposed. relationship base...

In this paper, a two-stage optimization strategy for designing defective unit cells of phononic crystal (PnC) to explore the localization and waveguide states target frequencies is proposed. model, PnC microstructures are parametrically described by series hyperelliptic curves, optimal designs can be obtained systematically changing designable parameters hyperellipse. The contains two individual processes. We obtain configurations perfect cell different orders band gap maximization....

Camera robot is an important tool for realizing and reproducing complex camera motion path in modern special film effects. This paper proposed inverse kinematics optimization algorithm PRRPR-S redundant degrees of freedom (DoF) robot. analyzed the characteristics, Genetic Mix (GM) method, from idea movement boundary composed part axis. Then Simplify (SM) method which can stably converge to global optimal solution a shorter time.

Inverse kinematic solutions for a dual redundant camera robot in position are examined order to alleviate operation difficulty and reduce time. The inverse algorithm is based on basic genetic algorithm, the which used solve problem of mainly optimized joint space. On this basis, improvement strategies studied. In paper, with constrained 2 degrees freedom (DOF) proposed through setting parameter variables, more flexible structure optimization objective function efficient than algorithm....

By acquiring the posture information of rigid body with markers, camera motion on robot end-effector can be controlled remotely. The essential step alignment in teleoperation is to calibrate transformation matrix world coordinate system optical capture and base system. It was necessary change position attitude studio frequently. At same time, complex strong personnel mobility, thus tracking needed re-established These two points asked pose calibration scheme convenient universal. In this...

Abstract An Integrated structural and material topology optimization method considering optimal orientation is presented based the on bi-direction evolutionary (BESO) method. It assumed that macrostructure composed of uniform cellular but with different orientation. The homogenization used to calculate effective properties which builds a connection between structure. continuous design variables discrete are treated hierarchically in an iteration. principal stress adopted embedded determine...

Through the realization of complex trajectory motions and multi-layer material shooting, camera robot can be an important tool for film television shooting. At present, planning needs to plotted in advance by professions, it has not been easy adjust on site. In addition, actual shooting scene, it's required running speed meet performance rhythm actors. This paper presents a control schema using real-time tracking unknown trajectories, stepless regulation existing trajectories. It mainly...

By reviewing the development of camera robot system, this paper extracts function and applicative characteristics first two generation systems. According to actual requirements film shooting evolution path by nature, proposes conceptual form fully automatic third-generation system suitable for photographer control. To explain major differences between earlier clearly, uses comparison methods in narration procedure. With consideration application, status, on-site engineering technology...