Considering the force‐displacement–current curve and intrinsic nonlinear characteristics of electromagnetic force, time‐lag adjustable high‐static‐low‐dynamic‐stiffness vibration isolation system are analyzed. The dynamic equations with parameters established. Utilizing averaging method, an analysis system’s bifurcation behavior is conducted, yielding critical conditions under which undergoes Hopf bifurcation. amplitude–frequency relationship main resonance response derived through...

Silica aerogels have already been recognized as potential candidates in the fields of thermal insulation, sorption, and separation, but intrinsic brittleness cumbersome preparation process limit their broad applications. In this work, a simple self-catalyzed gelling strategy was applied to prepare organic–inorganic situ hybrid (OIHAs) derived from bis[3-(triethoxysilyl)propyl]amine (BTPA) methyltrimethoxysilane (MTES). The Si–CH3 groups MTES make it possible for OIHAs be prepared through...

Abstract A new adjustable high static–low dynamic stiffness vibration isolator is presented to improve the effective isolation frequency bandwidth. Firstly, finite element simulation of electromagnetic positive device and negative one carried out. Through static analysis, mathematical expressions force–displacement–current stiffness–displacement–current are derived. The requirements that system works at quasi-zero-stiffness condition near equilibrium position obtained. influences different...

Based on the physical numerical modeling of flow field muffler in this paper, author simulated by method with Fluent and analyzed effect which internal has performance muffler, may be a credible guidance structural design.

Several common used image mosaics algorithms are analyzed and compared new algorithm based on feature points matching is presented, in which stitch determined through finding corresponding of two images its position determined; Image accomplished fusing process overlapping area experiment carried out order to test the presented paper lastly. Experiment proves responsibility proposed this good result gained.

The Si3N4 foam ceramics with an outer shell (~500 ?m) have been prepared by utilizing reactive sintering and pre-embedded activated carbon powder. After at 1400 ?C for 6 h, the microstructure of exhibited staggered columnar crystals. And when nitridation temperature was increased to 1450 ?C, length crystal column in has increased, which resulted a higher aspect ratio. Moreover, time 10 transformed into equiaxed crystals, reduced ratio columns. However, inner porous region irregular...

Based on LOD algorithm of triangle collapse, a optimal collapse is proposed, in which Threshold imported according to mesh simplification extent control error, thus the new vertex determined based certain error and LODs 3-D model generated. And more, interpolating between different brought forward smooth transition levels detail accomplished.

Spherical virtual space modeling using fisheye image was accomplished based on mosaics and multi-viewpoint navigation analyzed. Test results demonstrated that browsing speed could be improved by re-projection technology effect also scaling technology. Finally immerse sense in environment enhanced good result gained.

?-Si3N4 nanowires with diameters of 100-180 nm (Si3N4-W1) and 420-510 (Si3N4-W2) were synthesized by a modified chemical vapour deposition (CVD) method their microstructure changes after high-temperature oxidation studied. The results showed that both Si3N4 not significantly oxidized when the temperature was lower than 900?C. However, Si3N4-W1 began to change at 1200?C, while Si3N4-W2 remained almost unchanged. Moreover, Si3N4- W1 treatment 1400?C, weight gain 26.4% 13.7%, respectively.

Based on LOD algorithm of triangle collapse, an optimal collapse is proposed and LODs 3-D model generated. And more, interpolating between different brought forward smooth transition levels detail accomplished.

In this paper, the overall designing idea on real terrain is firstly proposed, geometric modeling process introduced, BinSplit binary segmentation algorithm put forward based fractal theory and midpoint displacement idea. Then visualization of 3-D OpenGL accomplished; thus sense generated good result gained.

Based on the physical modeling of improved muffler in this paper, Methods for internal acoustic computation with SYSNOISE software based Indirect Boundary Element Method are introduced and rationality modal validated by results which may be a credible guidance improving design.

Stitch points is determined through finding corresponding feature of two images and its matching position determined; image mosaics accomplished fusing process in overlapping area. Experiment proves responsibility algorithm proposed this paper good result gained.

This paper proposed an algorithm of collision detection based on a hybrid model which was different from other model. In this model, box used according to occasion. And the intersection calculation between bounding boxes analyzed and finally optimization gained.

Hazard installation identification was the key and difficult point for ship power equipment safety management. According to characteristics of equipments, this article analyzed characteristic hazard installations, given range classification identification. Combining checklist routing inspection, method process hazards proposed equipment, which laid a foundation its risk assessment control.

High-efficiency and low-cost solar-driven interfacial evaporation is a promising approach for seawater desalination ships, islands, offshore platforms. Thus far, various nanostructured materials have been developed, chemical regulation, surface engineering, other modification strategies applied. As result, the rate of systems has significantly increased. However, still suffer from disadvantages such as high cost complex preparation processes. Furthermore, exhibit poor mechanical properties,...

The butterfly valve is a that regulates flow; however, there are many limitations to the development of valves can be used in 600°C environment. In this study, stability was evaluated through fluid-structure interaction analysis, thermal-structure and seismic analysis develop could high-temperature environments. structural stress body seat below normal pressure when backpressure applied valve. minimum safety factor approximately 1.4 relative material allowable strength components system, so...

In this study, it was important to create a virtual human that acted naturally in front of the user. order give natural movement, we used developed motion capture technology. We have technology various 3D models movement. article, present technique for creating body using mannequins provided by computer graphics software Studio Maxa. The main difficulty with problem is Maxa claims 28 feature points describe motion, but system assumes smaller number points. Therefore, paper proposes generate...