How does the Energy-Injecting Virtual Mass Resonant Column accurately measure material properties through virtual mass resonance?
Publish Time: 2024-10-15
The Energy-Injecting Virtual Mass Resonant Column is an advanced test device that accurately measures material properties through the principle of virtual mass resonance.1. Basic PrinciplesIn a resonant column system, when a torque proportional to the angular acceleration of the attached mass block is applied to the column, the applied torque is equivalent to the moment of inertia of an additional virtual mass according to the D'Alembert principle. Therefore, the resonant frequency of the system can be controlled by the applied torque, and the stiffness of the soil column can be solved by the system parameters, virtual mass and resonant frequency. The same principle applies to damping control. If the energy injected into the system by the applied torque is equal to the energy dissipated when the system vibrates, the system will continue to vibrate stably with equal amplitude.2. Process of Accurately Measuring Material PropertiesSystem Construction:The Energy-Injecting Virtual Mass Resonant Column system usually includes a Hardin-type resonant column with a fixed bottom end and a free top end, as well as a device for applying torque and measuring response.During the test, the soil sample is placed in the resonant column and connected to the system through the additional mass block and torque device.Parameter setting:Before starting the test, it is necessary to set the system parameters, such as the moment of inertia of the additional mass block, the magnitude and direction of the torque, etc.The setting of these parameters will affect the resonant frequency and damping characteristics of the system, thereby achieving accurate measurement of material properties.Torque application and resonance:When torque is applied to the system, it will produce a virtual mass effect proportional to the angular acceleration of the additional mass block.This effect will change the resonant frequency and damping characteristics of the system, allowing the system to resonate at a specific frequency.Data measurement and analysis:During the resonance process, the system will record the vibration response of the soil sample, such as amplitude, frequency and phase.By analyzing these response data, the dynamic characteristic parameters of the soil sample, such as shear modulus and damping ratio, can be calculated.3. Advantages and ApplicationsAdvantages:Energy-Injecting Virtual Mass Resonant Column can overcome some defects of traditional measuring instruments, such as the disturbance of soil samples by pre-vibration during frequency sweeping and the inability to continuously measure the dynamic characteristics under various shear strains.It can accurately measure the dynamic characteristics of soil under small strains and provide detailed information about material properties.Applications:This technology has broad application prospects in civil engineering, geological engineering, materials science and other fields.It can be used to evaluate the stability and bearing capacity of soil, predict the impact of natural disasters such as earthquakes on soil, and optimize engineering design and construction plans.In summary, Energy-Injecting Virtual Mass Resonant Column can accurately measure the dynamic characteristic parameters of materials through the principle of virtual mass resonance, providing strong support for engineering design and scientific research.
