Contact and Impact

2018 ◽  
pp. 261-284
Author(s):  
Parviz E. Nikravesh
Keyword(s):  
Contact And Impact

scholarly journals P-498 Evaluation of electrode-tissue contact and impact of cavitary cooling during temperature-controlled radiofrequency catheter ablation in vitro

EP Europace ◽  
2003 ◽  
Vol 4 (Supplement_2) ◽  
pp. B183-B183
Author(s):  
N. Stagegaard ◽  
H. Hogh Petersen ◽  
L. Ramlose ◽  
X. Chen ◽  
J Hastrup Svendsen
Keyword(s):  
Catheter Ablation ◽  
Radiofrequency Catheter Ablation ◽  
Temperature Controlled ◽  
Contact And Impact

Drill Rod Lateral Vibration Mechanics during Mining Horizontal Drilling for Gas Drainage

2014 ◽  
Vol 1027 ◽  
pp. 302-305
Author(s):  
Xiao Ming Han ◽  
Dong Sheng Li ◽  
Long Lie Zhang ◽  
Xing Yu Han
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Element Model ◽  
Lateral Vibration ◽  
Gas Drainage ◽  
Horizontal Drilling ◽  
Sine Curve ◽  
Hole Wall ◽  
Contact And Impact ◽  
The Finite Element Model

Through the condition analysis of the drill rod during the mining horizontal drilling for gas drainage, the finite element model of the drill rod lateral vibration is established. The drill rod lateral vibration is related to the diameter and length of the drill rod. With the increase of the diameter of the drill rod, the natural frequency of the lateral vibration of the drill rod increases constantly. The increasing amplitude of the natural frequency at the larger diameter of the drill rod is larger than that at the smaller diameter. When the drill rod is longer, the natural frequency of the lateral vibration of the drill rod is lower. From the modal images of the drill rod, the lateral vibration of the drill rod is similar to the sine curve. During the horizontal drilling in coal seam, the drill rod contact and impact with the hole wall which will bring about the fatigue fault of the drill rod and the collapse of the hole wall.

Dynamic Simulation of the Meshed Gears Based on ADAMS

2014 ◽  
Vol 800-801 ◽  
pp. 708-711
Author(s):  
Bo Zhu ◽  
Xi Chen ◽  
Liang Zhou
Keyword(s):  
Dynamic Simulation ◽  
Simulation Method ◽  
Mechanical Analysis ◽  
Force Curve ◽  
Effective Dynamic ◽  
Impact Parameters ◽  
Definition Of ◽  
Contact And Impact ◽  
Design And Manufacture ◽  
The Impact

Gears are widely used in engineering machinery. Mechanical analysis of the gears matters more much than motion analysis when they are used in heavy machinery or equipment. Dynamic simulation of the meshed gears is based on the theory of contact and impact concerning with the definition of the impact parameters and the model in ADAMS, so the dynamic simulation process is often complicated. In this paper, an effective dynamic simulation method of meshed gears was proposed by analyzing the physical significance of the impact parameters and the calculation method of the impact, and the force curve of the meshed gears was simulated. This result can provide basis for the design and manufacture of the gear.

scholarly journals ANALYSIS OF RIGID AND FLEXIBLE DYNAMICS OF A SPACE-SLIDER-CRANK MECHANISM BASED ON FINITE ELEMENT METHOD

2021 ◽  
Vol 50 (02) ◽  
Author(s):  
NGOC THAI HUYNH ◽  
CONG RO HOANG ◽  
TRUNG KIEN TRAN ◽  
VAN HOAI LE
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Force ◽  
Maximum Principal Stress ◽  
Contact Forces ◽  
Element Analysis ◽  
Ball Impact ◽  
Contact And Impact ◽  
Crank Mechanism ◽  
Element Method

The investigation analyzes effects of clearance size in revolute and spherical joints with clearance on rigid-flexible dynamic of a space slider crank mechanism by finite element method. The model of the mechanism was designed by Solidworks and then velocity, acceleration, displacement, stress and contact force were determined by finite element analysis of rigid-transient dynamic in ANSYS. The results simulation indicated that the clearance size in revolute and spherical with clearance has sightly effected on the velocity of the slider, but has significantly effected on acceleration, contact force as journal and ball impact into bearing and socket with high peaks of acceleration and contact force as presented in the graph of acceleration and contact forces. The graph outlined that journal and ball motion with three types: free light, contact and impact motion. Clearance size created deviation for the displacement of the slider from 4.29 mm to 9.87 mm and maximum principal stress increases from 8.4 MPa to 10 MPa when clearance size increases from 0 mm to 0.3 mm.

Interethnic Contact and Impact on Attitudes

2018 ◽  
Author(s):  
Beyza Buyuker ◽  
Amanda Jadidi-D'Urso ◽  
Alexandra Filindra
Keyword(s):  
Interethnic Contact ◽  
Contact And Impact

Steps Towards Non-Smooth Multibody Dynamics

2021 ◽  
Author(s):  
Friedrich Pfeiffer
Keyword(s):  
System Theory ◽  
Multibody Dynamics ◽  
Multibody System ◽  
Local Development ◽  
Impact Behavior ◽  
Unilateral Constraints ◽  
The Past ◽  
Bilateral Constraints ◽  
Large Systems ◽  
Contact And Impact

Abstract Before the background of many thoughts about contact and impact behavior with and without friction in the past centuries a comprehensive theory appeared not before the second half of the last century, mainly connected with the names of Moreau in Montpellier and Panagiotopoulos in Thessaloniki. My former Institute has been part of this evolution focusing on non-smooth multibody dynamics and on large systems. The local development from simple impact to complex contact systems including all possible contact details will be subject of the paper, considering also the necessary mathematical evolution from classical multibody system theory with bilateral constraints and single-valued forces to non-smooth multibody system theory with unilateral constraints and set-valued forces. Paper will be illustrated by practical examples.

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