混凝土中的非平衡动态:诱导调节对非线性可达波干扰计参数的影响
Shilan Shaabani1, Pierric Mora1, Parisa Shokouhi2
1GERS-GeoEND, Univ Gustave Eiffel, Bouguenais, CS5004, F-44344, France.
The Journal of the Acoustical Society of America
|January 26, 2026
概括
非线性可达波干扰测量 (NCWI) 可以检测裂,但它的有效性取决于送协议. 较长的持续时间和一致的振幅序列对于使用这种技术进行准确的现场材料监测至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 非破坏性测试 不破坏性测试
- 超声波是一种超声波.
背景情况:
- 线性超声波测试难以检测紧密的裂和微裂.
- 非线性超声波技术,如非线性可达波干扰测量 (NCWI),提供了更好的灵敏度.
- NCWI利用高频可达波和低频高振幅送来检测裂纹相关的速度变化.
研究的目的:
- 调查送协议对NCWI实地材料监测结果的影响.
- 探索动态运行载荷作为NCWI的源的潜力.
- 了解依赖于时间的材料对抽反应的基本机制.
主要方法:
- 系统地调查NCWI中的时间和振幅序列.
- 在稳定的温度和湿度下,对完整和破裂的混凝土块进行了受控实验.
- 分析相对速度变化作为动参数的函数.
主要成果:
- 较长的持续时间与较大的相对速度变化相关,表明渐进的裂开放/滑动.
- 幅下降导致速度变化较小,表明材料恢复不完全.
- 与完整的相比,在受损的混凝土块中观察到相对较高的相对速度变化.
结论:
- 输送协议,包括持续时间和振幅历史,显著影响NCWI结果.
- 时间依赖的物质反应是NCWI解释的关键因素.
- 连贯和优化的送协议对于NCWI可靠的现场监测至关重要.
相关概念视频
Dynamic Equilibrium
62.4K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
62.4K
Pumped Concrete
371
Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
371
Wave Parameters
9.3K
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
9.3K
Conditions of Equilibrium
2.1K
Equilibrium refers to a state where a rigid body is not subjected to any translational or rotational motion. This state is achieved when the force and couple acting on a rigid body equal zero. When the system of external forces results in a net effect equivalent to zero, the rigid body is considered to be in equilibrium.
Internal forces are not considered for conditions of equilibrium because they occur in equal and opposite pairs within the body, effectively canceling each other. As a result,...
Internal forces are not considered for conditions of equilibrium because they occur in equal and opposite pairs within the body, effectively canceling each other. As a result,...
2.1K
Equilibrium Conditions for a Particle
2.2K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
2.2K
Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model
309
Drugs administered through various routes can lead to nonlinear elimination, resulting in complex pharmacokinetic behaviors crucial to understanding efficacious drug dosing.
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
309


