Longitudinal elastic stress impulse induced by impact through a spring-dashpot system: Optimization and inverse problems for the spring stiffness

“…Assume the hammer's collision with the drill is an interaction between a single mass block and a semi-infinite polished rod via a spring damping element without the additional effect of reflected waves on the percussive stress, as shown in Figure 5 [26]. According to Newton's second law and the equation for the transmission of a one-dimensional stress wave transmission, the collision between the hammer and the drill should satisfy the following equations and boundary conditions:…”

Section: Mechanical Model Of the Collision Between The Hammer And Thementioning

confidence: 99%

Analysis and Testing of Load Characteristics for Rotary-Percussive Drilling of Lunar Rock Simulant with a Lunar Regolith Coring Bit

Zhang

Jiang

Zhang

2017

Shock and Vibration

View full text Add to dashboard Cite

Based on an optimized lunar regolith coring bit (LRCB) configuration, the load characteristics of rotary-percussive drilling of lunar rock simulant in a laboratory environment are analyzed to determine the effects of the drilling parameters (the rotational velocity, the penetration rate, and the percussion frequency) on the drilling load. The process of rotary drilling into lunar rock using an LRCB is modeled as an interaction between an elemental blade and the rock. The rock’s fracture mechanism during different stages of the percussive mechanism is analyzed to create a load forecasting model for the cutting and percussive fracturing of rock using an elemental blade. Finally, a model of the load on the LRCB is obtained from the analytic equation for the bit’s cutting blade distribution; experimental verification of the rotary-impact load characteristics for lunar rock simulant with different parameters is performed. The results show that the penetrations per revolution (PPR) are the primary parameter influencing the drilling load. When the PPR are fixed, increasing the percussion frequency reduces the drilling load on the rock. Additionally, the variation pattern of the drilling load of the bit is in agreement with that predicted by the theoretical model. This provides a research basis for subsequent optimization of the drilling procedure and online recognition of the drilling process.

show abstract

“…The problem concerning the phenomena occurring in an elastic semi-space hit by a moving mass on the surface has been investigated, e.g., in articles [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…In the paper [22], an exact analytical solution of the problem was obtained for the impact of a rigid mass on a semi-infinite elastic rod by a Kelvin-Voigt linear element.…”

Section: Introductionmentioning

confidence: 99%

Research of Dynamic Processes in an Anvil During a Collision with a Sample

Pyryev

Penkul

Cybula

2023

Acta Mechanica Et Automatica

View full text Add to dashboard Cite

The paper concerns modelling the dynamics of the contact system of the tested sample with an elastic half-space (anvil) during their collision. The original elements in the paper include the proposed general approach to solving the problem of contact dynamics. The presented approach consists in determining the force of impact on the sample during the collision and the joint solution of the problem for the tested sample and the problem for an elastic semi-space under the conditions of the assumptions of Hertz’s theory. The resulting interaction forces allow the determination of displacements and stresses.

show abstract

Longitudinal elastic stress impulse induced by impact through a spring-dashpot system: Optimization and inverse problems for the spring stiffness

Cited by 6 publications

References 9 publications

Tuning the mechanical impedance of disordered networks for impact mitigation

Tuning the mechanical impedance of disordered networks for impact mitigation

Analysis and Testing of Load Characteristics for Rotary-Percussive Drilling of Lunar Rock Simulant with a Lunar Regolith Coring Bit

Research of Dynamic Processes in an Anvil During a Collision with a Sample

Contact Info

Product

Resources

About