All but the simplest physical systems contains mechanical joints. The behavior of these joints is sometimes the dominant factor in over all system behavior. The potential for occurence of microslip and macroslip normally makes the behavior of joints non-linear. Accurate modeling of joints requires a non-linear ramework. As clamping pressures are typically random ad variable, the behavior of the joints becomes random. Joint geometries are random along with other unknowns of the joints.Two different methods for measuring the energy dissipation are explained. In the experimental method, the energy dissipation of a non-linear joint is calculated from the slope of the envelope of the time response of acceleration. The simulation work is carried out by considering a smooth hysteresis model with the help of Matlab programming. Finally, the parameters are extracted for a specific non-linear system by comparing analytical and experimental results.
Author: Sreenivasarao Manchu
Source: Blekinge Institute of Technology
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Contents
1 Notation
2 Introduction
2.1 Background
2.2 Aim & Purpose
2.3 Problem analysis
2.4 Limitations
2.5 Disposition
3 Mechanical Joints
3.1 Introduction
3.2 Mechanical Lap Joint – Functional Description
4 Damping
4.1 Introduction – General considerations of damping
4.2 Characterization of Damping
5 Methods for measuring Energy Dissipation
5.1 Measuring the energy loss by finding the area within the
Force/Relative Displacement Hysteresis Loop
5.1.1 Simulation of Linear System
5.1.2 Simulation of Non Linear System
5.2 Measuring the Energy Dissipation from the slope of the Envelope
6 Experiment & Analysis
6.1 Experimental Configuration
6.2 Analysis of Experimental Data
6.3 Calculation of energy dissipation
7 Mathematical model
7.1 Introduction
7.2 Theory
7.3 Simulation & Analysis
8 Results & Discussion
8.1 Experimental Results
8.2 Simulation Results
9 Conclusions
10 References