Investigations on the linear vibration characteristics of bistable unsymmetrical laminates

2022 ◽  
Author(s):  
P. M. Anilkumar ◽  
B. N. Rao ◽  
A. Haldar ◽  
Sven Scheffler ◽  
Marlene Wolniak ◽  
...  
Keyword(s):  
Vibration Characteristics ◽  
Linear Vibration

Mathematical Modeling and Analysis of Vibration Characteristics of Smart-Phone

2013 ◽  
Vol 284-287 ◽  
pp. 800-805
Author(s):  
Suk Min Yoon ◽  
Jae Hee Kim ◽  
Jin Ho Kim
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Analysis ◽  
Smart Phone ◽  
Vibration Characteristics ◽  
Linear Actuator ◽  
Vibration Characteristic ◽  
Linear Vibration ◽  
Modeling And Analysis ◽  
Key Technologies

Slimming of a smart phone is one of the key technologies in the current smart-phone industry. Because the vibration actuator is the thickest part of a smart phone, a slim linear vibration actuator has been developed. For the analysis of the vibration characteristic of a smart phone, experiment has been used one of the most popular techniques, but it consumes a lot of cost and time. Accordingly, as an alternative to experiments, mathematical modeling and analysis can be applied. In this paper, a mathematical modeling is created for analysis of the vibration characteristics of a smart-phone applied with a horizontally vibrating linear actuator. In addition, the result of the mathematical analysis is compared with that of the experiment for verification.

LINEAR VIBRATION CHARACTERISTICS OF CABLE–BUOY SYSTEMS

2002 ◽  
Vol 252 (3) ◽  
pp. 443-456 ◽  
Author(s):  
W.-J. KIM ◽  
N.C. PERKINS
Keyword(s):  
Vibration Characteristics ◽  
Linear Vibration

scholarly journals Nonlinear Vibration Characteristics of a Flexible Blade with Friction Damping due to Tip-Rub

2011 ◽  
Vol 18 (1-2) ◽  
pp. 105-114 ◽  
Author(s):  
Dengqing Cao ◽  
Xiaochun Gong ◽  
Dong Wei ◽  
Shiming Chu ◽  
Ligang Wang
Keyword(s):  
Nonlinear Vibration ◽  
Piecewise Linear ◽  
Equation Of Motion ◽  
Vibration Characteristics ◽  
Vibration Characteristic ◽  
Linear Vibration ◽  
Friction Damping ◽  
The Galerkin Method ◽  
Three Degree Of Freedom ◽  
Frequency Curves

An approximate approach is proposed in this paper for analyzing the two-dimensional friction contact problem so as to compute the dynamic response of a structure constrained by friction interfaces due to tip-rub. The dynamical equation of motion for a rotational cantilever blade in a centrifugal force field is established. Flow-induced distributed periodic forces and the internal material damping in the blade are accounted for in the governing equation of motion. The Galerkin method is employed to obtain a three-degree-of-freedom oscillator with friction damping due to tip-rub. The combined motion of impact and friction due to tip-rub produced a piecewise linear vibration which is actually nonlinear. Thus, a complete vibration cycle is divided into successive intervals. The system possesses linear vibration characteristic during each of these intervals, which can be determined using analytical solution forms. Numerical simulation shows that the parameters such as gap of the tip and the rotational speed of the blades have significant effects on the dynamical responses of the system. Finally, the nonlinear vibration characteristics of the blade are investigated in terms of the Poincare graph, and the frequency spectrum of the responses and the amplitude-frequency curves.

Research on Vibration Characteristics of the Pedestal and Equipment Systems with Variable Parameter

2012 ◽  
Vol 479-481 ◽  
pp. 1273-1276
Author(s):  
Hai Long Chen ◽  
Zhong Hui Qiu ◽  
Fu Zhen Pang ◽  
Lv Zheng
Keyword(s):  
Differential Equation ◽  
Forced Vibration ◽  
Piecewise Linear ◽  
Variable Parameter ◽  
Vibration Characteristics ◽  
Exciting Force ◽  
Vibration Response ◽  
Single Frequency ◽  
Linear Vibration ◽  
Vibration Problem

According to the relation between exciting force and the pretightening force, the parameter of pedestal and equipment systems can be variable or invariable. The differential equation for forced vibration problem of the system has been established. The condition whether piecewise linear vibration will happen has been found. The result shows that the system will appear multi-frequency vibration response on the condition of single-frequency turbulence force. The results in this paper can be applied to the installation of the equipment.

Characterisation of the Humming-Type Noise and Vibration of the Automotive HVAC System

2019 ◽  
Vol 16 (2) ◽  
pp. 6634-6648
Author(s):  
A. Z. A. Mazlan ◽  
M. H. A. Satar ◽  
M. H. Hamdan ◽  
M. S. Md. Isa ◽  
S. Man ◽  
...  
Keyword(s):  
Vibration Characteristics ◽  
Operating Conditions ◽  
Hvac System ◽  
Frequency Range ◽  
Noise And Vibration ◽  
Power Steering ◽  
Pump Compressor

The automotive heating and ventilating air condition (HVAC) system, when vibrating, can generate various types of noises such as humming, hissing, clicking and air-rushes. These noises can be characterised to determine their root causes. In this study, the humming-type noise is taken into consideration whereby the noise and vibration characteristics are measured from various HVAC components such as power steering pump, compressor and air conditional pipe. Four types of measurement sensors were used in this study - tachometer for rpm tracking; accelerometer for the vibration microphone for the noise; and sound camera for the visualization measurement. Two types of operating conditions were taken into consideration - they were “idle” (850 rpm) and “running” (850-1400 rpm) conditions. A constant blower speed was applied for both conditions. The result shows that the humming noises can be determined at the frequency range of 300-350 Hz and 150-250 Hz for both idle and running conditions, respectively. The vibration of the power steering pump shows the worst acceleration of 1.8 m/s2 at the frequency range of 150-250 Hz, compared to the compressor and air conditional pipe. This result was validated with the 3D colour order and sound camera analyses, in which the humming noise colour mapping shows dominance in this frequency range.  

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