A5075879421- Acoustic Wave Phenomena Research
- Noise Effects and Management
- Cellular and Composite Structures
- Metamaterials and Metasurfaces Applications
- Geomechanics and Mining Engineering
- Aerodynamics and Acoustics in Jet Flows
- Hearing Loss and Rehabilitation
- Rock Mechanics and Modeling
- Railway Engineering and Dynamics
- Vibration Control and Rheological Fluids
- Mechanical Behavior of Composites
- Geophysics and Sensor Technology
- Structural Health Monitoring Techniques
- Structural Engineering and Vibration Analysis
- Geoscience and Mining Technology
- Geotechnical and Geomechanical Engineering
- Vibration and Dynamic Analysis
- Structural Behavior of Reinforced Concrete
- Structural Load-Bearing Analysis
- Natural Fiber Reinforced Composites
- Hydraulic and Pneumatic Systems
- Grouting, Rheology, and Soil Mechanics
- Advanced Antenna and Metasurface Technologies
- Fluid Dynamics Simulations and Interactions
- Recycled Aggregate Concrete Performance
Northwest A&F University
2025
Yanshan University
2010-2024
Henan Polytechnic University
2011-2024
State Key Laboratory of Metastable Materials Science and Technology
2022
State Administration of Work Safety
2022
Northeast Petroleum University
2011
To achieve multi-frequency vibration suppression and wave propagation modulation, eight branching ligament structures for wind models are proposed. Using lattice theory, dynamical model finite element release method, the verified to have bandgaps. By attaching a solid disc at center of model, bandgap coverage structure is improved frequency reduced. The modal analysis shows that branch ligaments border has effect on elastic waves. phase constant surface, velocity direction plots specific...
In this paper, novel two-dimensional single-phase three-ligament, four-ligament and six-ligament chiral structure models are proposed. The advantage is that it easy to manufacture with few components, has good sound insulation vibration damping performance, more practical. dispersion information of the calculated by combining Bloch's theorem finite element method. By varying geometric parameters new structural single-cell simulating transmission period check suppression capability optimized...
Metamaterials with low-frequency band gap have always been the focus of research. For this reason, many researchers proposed structural design schemes. In paper, an innovative star-shaped hybrid metamaterial structure is proposed. Based on Bloch's theorem and finite element method, a dynamic model established, characteristics are analyzed, generation mechanism discussed mode shape specific frequency. Then, propagation elastic wave in analyzed by using dispersion surface group velocity...
(1) Background: This study aimed to evaluate the effects of organic fertilizer dose on soil nutrients, wolfberry fruit nutrient compositions, and yields. (2) Methods: We conducted a two-year field trial in two typical fields with different fertility levels Qaidam area. Six treatments were applied each field, including CK, M2 M4, M6, M8, M10 (representing 0, 2, 4, 6, 8, 10 kg fertilizer/plant, respectively) high-fertility M3, M9, M12, M15 3, 9, 12, 15 low-fertility field. An ANOVA was used...
In this paper, a new kind of acoustic metamaterials, the reentrant and star-shaped hybrid honeycomb metamaterials (RSHHM) were proposed, in which elastic rubber coated mass inclusions added to create low-frequency band gaps. Formation mechanisms for gaps effects geometrical parameters number filled on RSHHM systematically studied by combining FE method Bloch's theorem. Meanwhile, transmissions finite-sized sandwich panels with core calculated verify vibration attenuation performances RSHHM....
In order to achieve low frequency vibration and noise reduction, researchers have found explored many types of metamaterial structures. Based on this, an innovative multiphase structure composed hard materials soft is proposed in this paper. According Bloch's theorem, the band gap characteristics are calculated using finite element method, formation mechanism analyzed. addition, effects stiffness density two studied detail. Then, phase velocity, group velocity wave propagation direction...
In order to achieve low-frequency vibration and noise reduction, this paper proposes an innovative structure based on the four-ligament chiral structure. The band gap characteristics principle of generation are numerically analyzed by using finite element method. By optimizing proposed structure, is obviously transferred low frequency. propagation elastic waves with a specific frequency passband in studied. Finally, calculated range compared simulation results, two correspond perfectly....
Labyrinthine acoustic metamaterials are good choices for realizing sound insulation, stealth, and lenses by virtue of their stable performance rich modes. We design a labyrinthine metamaterial with eight resonance units utilizing triangular self-similarity. First, the help eigenstate analysis, it is demonstrated that has monopolar multipolar Then, physical mechanisms generate transmission valleys isolation peaks analyzed applying equivalent medium theory vibrational velocity field. Finally,...
The composite sandwich panel of aluminum foam and epoxy resin uses interpenetration to form a surface layer, which makes the layer core material whole greatly improves integrity panel. In this paper, failure modes is studied by drop weight impact tests compared with traditional effects velocity, thickness hammerhead shape on dynamic property are analyzed. force–time curves, force–displacement curves energy–time were obtained, maximum force duration time each group compared. results show that...
In this paper, based on the local resonance mechanism, four thin elastic plate structures with low-frequency bandgap are proposed through structural design and optimization. The first onset frequency of optimized structure is lower than 100 Hz, which realizes vibration damping provides an effective method for subsequent research. It analyzed that caused by offset form, opening due to scatterer substrate, forms include rotational resonance. Group velocity phase images show variations have a...
The two circular structures with local resonance resonant hammers proposed in this paper have the comprehensive performance of small size, easy fabrication and low frequency vibration sound damping. In study, Bloch's theorem is used to calculate energy band curves analyze forms at edge gap. At same time, integrated analysis means phase constant surface, group velocity are innovatively explore real propagation path waves provide experience for topology optimization. position hammers, mirror...
Metamaterials have received extensive attention due to their special properties in the fields of wave attenuation and acoustic engineering. Many researchers designed metamaterials with different band gap frequency ranges. In this paper, a star shaped metamaterial structure triangular characteristics is proposed attenuate mid low elastic waves practical applications. The dispersion are numerically studied. results show that generates ultra-wide gaps range 6000 Hz, accounting for up 69.14%....
The present study develops a new type of epoxy resin–aluminum honeycomb composite sandwich panel. Failure modes and typical force–displacement curves are measured through quasi-static localized indentation tests. effects different parameters on the elastic ultimate load energy absorption analyzed. results indicate that newly developed panel has good integrality, stability, capacity. curve exhibits three types all them consist six phases, namely: phase, local damage strengthening global...
Accurate division of the water-conducting fracturing zone (WCFZ) in mining overburden serves as an important basis to evaluate stability coal under water bodies. Research on WCFZ is conducive controlling surface subsidence and realizing safe water. Traditionally, generally determined by field observation (liquid leakage method, borehole television, etc.) or empirical formula. Although these methods boast high accuracy, they are time-consuming laborious have some problems such weak pertinence...