Chatter control and stability analysis in cantilever boring bar using FEA methods

2020 ◽  
Vol 33 ◽  
pp. 2577-2580
Author(s):  
Singaravelu Chockalingam ◽  
S. Ramabalan ◽  
K. Govindan
Keyword(s):  
Stability Analysis ◽  
Boring Bar ◽  
Chatter Control

System Identification for Boring Bar Chatter Control

1993 ◽  
Author(s):  
Jonathan A. Embry ◽  
Suzanne Weaver Smith ◽  
Bruce L. Walcott
Keyword(s):  
Aerospace Industry ◽  
Low Frequency ◽  
Structure Identification ◽  
Space Structures ◽  
Modal Interactions ◽  
Element Analysis ◽  
Flexible Space Structures ◽  
Boring Bar ◽  
Low Frequency Vibration ◽  
Chatter Control

Abstract The boring bar is used to provide smooth, accurate cuts in materials. However, when the length to diameter (L/D) ratio of the boring bar becomes large, low-frequency vibration, or chatter, results. Initial attempts to control this unwanted vibration with an active absorber have been successful, but in some configurations problems remain. In this paper, algorithms for flexible structure identification widely used in the aerospace industry are applied to a number of boring bar setups to identify the vibration characteristics of each system. Emphasis is placed on one class of methods which includes the Eigensystem Realization Algorithm (ERA), developed for identification of flexible space structures. The resulting identified characteristics are compared and contrasted. Results are also compared to finite element analysis predictions. From the current identification results, implications for chatter control are discussed, including the possibility of nonlinear modal interactions.

scholarly journals Boring Bar Chatter Control using Feedback Filtered-x Normalized Least Mean Square Algorithm

2019 ◽  
Vol 52 (10) ◽  
pp. 358-363 ◽  
Author(s):  
Mohsen Fallah ◽  
Behnam Moetakef-Imani ◽  
Ali Hosseini ◽  
Mostafa Ebrahimi
Keyword(s):  
Mean Square ◽  
Least Mean Square ◽  
Boring Bar ◽  
Normalized Least Mean Square ◽  
Chatter Control ◽  
Least Mean Square Algorithm

Development of a Hydraulic Chambered, Actively Controlled Boring Bar

1979 ◽  
Vol 101 (3) ◽  
pp. 362-368 ◽  
Author(s):  
D. J. Glaser ◽  
C. L. Nachtigal
Keyword(s):  
Active Control ◽  
Small Amplitude ◽  
Research Work ◽  
Practical Method ◽  
Optimal Combination ◽  
Design Development ◽  
Boring Bar ◽  
Dynamic Cutting Force ◽  
Chatter Control ◽  
Actuation Scheme

A major problem in the active control of the boring process is developing a practical method of providing small-amplitude tool-tip positioning. The main thrust of the underlying research work is the design, development and evaluation of a new actuation concept for active control of the boring operation. The actuation concept was implemented using a special boring bar with two internal longitudinal hydraulic chambers. A pressure difference between these two chambers provides the driving force to create the desired tool-tip motion. Using a measure of the dynamic cutting force, the controlled boring bar system was successful in making improvements over the uncontrolled boring bar’s cutting performance in terms of regenerative chatter control. The cutting tests used in this thesis were plunge cuts in mild steel. The controlled level of improvement was smaller than was anticipated. The problem was considered not a fault of the actuation scheme, but a result of a non-optimal combination of the servovalve, measurement system and controller. Further work in these areas should yield considerably improved results using the new actuation concept.

The Effect of Flexible-Tool Rotation on Regenerative Instability in Machining

2003 ◽  
Vol 125 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Chen-Jung Li ◽  
A. Galip Ulsoy ◽  
William J. Endres
Keyword(s):  
Stability Analysis ◽  
Approximate Solutions ◽  
Coordinate Frame ◽  
Machining Processes ◽  
Flexible Tool ◽  
Boring Bar ◽  
Machining Force ◽  
The Stability ◽  
Stability Limits ◽  
Tool Rotation

For rotating-tool machining, such as milling, line boring, and cylinder boring, the tool rotation causes the machining force on each tooth to rotate repetitively relative to the inertial coordinate frame. This is quite different than stationary-tool machining, such as turning or boring with a stationary boring bar, in which the force directions are fixed relative to the inertial frame. Although the subject of stability analysis for rotating tools has been studied extensively in milling, the process is intermittent and hence time varying, which leads to analysis methods that are either analytically approximate or employ time-domain simulation. In this paper nonintermittent machining processes that employ a rotating tool are modeled and analyzed in the rotational coordinates both to simplify the stability analysis and to permit an exact solution. Using rotating-bar boring to illustrate, the analytical results show that the stability limits for boring with a rotating boring bar are quite different from those for boring with a stationary boring bar, and the experimental validation is also provided. Furthermore, the results show a discrepancy to exist between the predicted stability limits for the exact and approximate solutions, especially at low spindle speeds. In both cases an explanation is provided based on the analysis presented.

scholarly journals Chatter and Stability Analysis of the Slender Composite Boring Bar with Constrained Damping Layer

2020 ◽  
Vol 10 (13) ◽  
pp. 4537
Author(s):  
Jinfeng Zhang ◽  
Hao Wang ◽  
Yongsheng Ren ◽  
Chao Feng ◽  
Chunjin Zhang
Keyword(s):  
Stability Analysis ◽  
Dynamic Stiffness ◽  
Beam Theory ◽  
Base Layer ◽  
Boring Bar ◽  
Rotating Speed ◽  
Stability Lobe ◽  
Analysis Theory ◽  
Constrained Damping ◽  
Euler Bernoulli Beam

This study investigates the chattering stability of the composite boring bar with a constrained damping layer during the deep-hole boring process in depth. Based on the Euler-Bernoulli beam theory, the regenerative chattering linear kinetic model of the composite boring bar with a constrained damping layer was established, and the computational formulas of the rotating speed of the spindle and the corresponding limit cutting depth were derived. By analyzing the chattering stability, the cutting stability lobe curves of the composite boring bar with a constrained damping layer were plotted so as to reveal the effects of the materials of both base layer and constrained layer, the ply angle, the damping composite structure (free or constrained damping structure) and the thickness of various layers on the chattering stability of the boring bar. Through the analysis of dynamic stiffness, the chatter stability analysis theory of a composite boring bar with a constrained damping layer is verified.

Research of Active Chatter Control for the Piezoelectric Intelligent Boring Bar with Distribution Quality

2014 ◽  
Vol 1030-1032 ◽  
pp. 1517-1520
Author(s):  
Xing Ke Cui ◽  
Rui Huo ◽  
Shu Ying Li ◽  
Cui Ping Liu ◽  
Dao Kun Zhang
Keyword(s):  
State Space ◽  
Dynamic Model ◽  
Stability Diagram ◽  
System Stability ◽  
Mass System ◽  
Boring Bar ◽  
Flutter Suppression ◽  
Chatter Control ◽  
The Stability ◽  
Space Equation

Seen as a cantilever beam with distributed mass system, the boring bar model and its state -space equation is built. On the basis of the dynamic model, a stability diagram of the boring system of the type of regenerative chatter is obtained. According to the stability diagram of the system, we get main analysis and comparison of the system stability near the fundamental frequency. In this paper, piezoelectric smart flutter suppression is carried out on a boring system with distributed mass, which improved the stability of the boring system

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