Frequency Dependent Vibration Attenuation of a Suspended Handle Using Piezostack Actuator

2015 ◽  
Vol 761 ◽  
pp. 211-215
Author(s):  
Ahmad Zhafran Ahmad Mazlan ◽  
Zaidi Mohd Ripin

This paper investigates the effectiveness of piezostack actuator in attenuating the frequency dependent excited vibration of a suspended handle. A shaker is used to produce a base excitation to the suspended handle and a piezostack actuator is used to generate the vibration cancellation for the handle. The investigation covers vibration operating frequency from 50 to 500 Hz. This study also looked at the initial performance of piezostack actuator for the AVC system. A PID controller is design to generate the counter voltage for the piezostack actuator to attenuate the vibration of the handle. The results show that the highest vibration attenuation of the suspended handle occurred at operating frequency of 450 Hz with 90 % of vibration attenuation and the lowest at 50 Hz with 2.4 % of vibration attenuation.

2013 ◽  
Vol 631-632 ◽  
pp. 1106-1110
Author(s):  
Wei Zhao ◽  
Qiang Wang ◽  
Sheng Li Song

In the tyred machinery chassis dynamometer control system, a fuzzy PID controller was used to adjust the exciting current of a DC dynamometer in order to change the resistance load torque, so the requirement of roller load for simulating the run resistance from the road surface was satisfied. A fuzzy PID arithmetic was designed to control the resistance loads, the system performance was improved by simulation. The software of the detection line measure-control system was designed in VB, the technical parameters of the machinery chassis could the automatically detected.


2013 ◽  
Vol 427-429 ◽  
pp. 257-261
Author(s):  
Li Xia Sun ◽  
Jian Wei Yao ◽  
Fu Guo Hou ◽  
Xin Zhao

In order to investigate self-excited vibration mechanism of wheel-rail lateral contact system, a two DOF elasticity position wheelset lateral vibration model is established which considers the dry friction; the mechanism of the wheelset lateral self-excited vibration is investigated from the energy point of view. It shows that: the bifurcation diagram of this wheel-rail lateral contact system has a supercritical Hopf bifurcation. The energy of self-excited vibration derives from a part of traction energy; the creep rate in the wheel-rail system act as a feedback mechanism in the wheelset lateral self-excited vibration system. The stability of the wheelset self-excited vibration system depends mainly on the total energy removed from and imported into the system.


1989 ◽  
Vol 111 (2) ◽  
pp. 130-133 ◽  
Author(s):  
K. R. Asfar

A passive vibration control system for the quenching of undesirable self-excited vibrations in mechanical systems is presented. The system is a Lanchester damper, attached to the main self-excited system; a van der Pol oscillator. A first-order perturbation solution shows that complete quenching of self-excited vibration is possible. The result is verified by numerical integration of the governing differential equations. Furthermore, the damper is shown to be effective in suppressing forced self-excited vibrations.


2013 ◽  
Vol 765-767 ◽  
pp. 1903-1907
Author(s):  
Jie Wei ◽  
Guo Biao Shi ◽  
Yi Lin

This paper proposes using BP neural network PID to improve the yaw stability of the vehicle with active front steering system. A dynamic model of vehicle with active front steering is built firstly, and then the BP neural network PID controller is designed in detail. The controller generates the suitable steering angle so that the vehicle follows the target value of the yaw rate. The simulation at different conditions is carried out based on the fore established model. The simulation results show the BP neural network PID controller can improve the vehicles yaw stability effectively.


2012 ◽  
Vol 12 (02) ◽  
pp. 285-310 ◽  
Author(s):  
M. EFTEKHARI ◽  
M. MAHZOON ◽  
S. ZIAEI-RAD

In this paper, a comparative study is performed for a symmetrically laminated composite cantilever beam with and without a tip mass under harmonic base excitation. The base is subjected to both flapwise and chordwise excitations tuned to the primary resonances of the two directions and conditions of 2:1 autoparametric resonance. In the literature, the governing nonlinear equations of the same problem without tip mass have been derived using the extended Hamilton's principle. Extension is made in this study to include the effect of a tip mass on the response of the beam. The natural frequencies are obtained numerically using the diversity guided evolutionary algorithm (DGEA). Next, the multiple scales method is applied to determine the nonlinear response and stability of the system. A set of four first-order differential equations describing the modulation of the amplitudes and phases of interacting modes are derived for the perturbation analysis. For verification, the above equations are reduced to the special case of the cantilever beam without tip mass for comparison with existing results. Finally, the effect of the tip mass on the stability of the fixed points and on the amplitude of oscillation about the equilibrium points in both the frequency and force modulation responses is examined.


2014 ◽  
Vol 953-954 ◽  
pp. 353-356 ◽  
Author(s):  
Fan Yang ◽  
Tong Yang ◽  
Xiao Hong Yang

Aimed at the high inertia and non-linear characteristics of yaw system, a parameter self –tuning fuzzy PID controller is designed. The controller can adjust the PID parameters based on the wind direction variation, and make the turbines track the coming wind timely to obtain maximum power output. Simulation results show that the controller has good real-time performance and robustness compared with the traditional PID control. It can lower the fluctuation and overshoot, and improve the stability of the yaw system significantly.


2012 ◽  
Vol 220-223 ◽  
pp. 1752-1756
Author(s):  
Gui Rong Dong

According to the perturbation in lithography positioning control system, a novel gain scheduled PID controller using a root mean square (RMS) signal is proposed. Perturbation is also referred as the stage hunting, and the positioning control system will be very weak against small disturbances such as electrical noise or even structural vibration of the building in which the stage is installed. The gain scheduled PID controller is used to minimize the stage hunting and simultaneously maximize the immunity to disturbances. Simulations results verify the effectiveness of the gain scheduled PID controller for the positioning control in the lithography stage, as compared with the traditional PID controller.


2001 ◽  
Vol 5 (3) ◽  
pp. 195-196
Author(s):  
THE EDITORS

‘Linking practice with research’ is both our cover slogan and our objective. arq covers the broad spectrum of architectural endeavour – which comes together in design and buildings – and publishes contributions from both academics and practitioners. Take this issue.First, it covers and considers architectural research in many forms and ways. There's Rem Koolhaas' research on shopping; a pioneering application of a passive environmental system; a competition-winning scheme for new housing; an account of a completely unknown project by Le Corbusier; and an introduction to an alternative to air-conditioning in hot, dry climates. There's also a timely look back towards the beginnings of university-based architectural research in the 1960s; the first English translation of Freyssinet's remarkable essay on the sublime; and a review of Zaha Hadid's recent work and its theoretical base.Second, each of this broad spread of topics is design and practice-related. Most of the authors have academic affiliations but seven are also architects in practice and one is a practising engineer. Just two are architectural historians. Two of the articles – those on the design of the Jersey Archive and on passive downdraught evaporative cooling are interdisciplinary and based on considerations of sustainability. Our letters pages reveal a bias towards practice – but, although all our correspondents are practising architects or engineers, most have strong connections with academia.But this issue takes things a step further: it is the very first arq to carry an article directly based on an architect's drawings and design report – rather than on a piece especially written for publication. ‘From table to basin: St Mary's Island’ (pp. 229–247) is a lightly edited version of a competition-winning entry for a large ‘brownfield’ site in South-East England. For many years, there have been very few competitions of this kind. The Editors felt that Buschow Henley's scheme deserved more coverage than it had enjoyed in the professional press. Our referees agreed and made just one recommendation – that the architects should write a short introduction outlining their theoretical position.In our second issue, in the middle of a lively debate then being conducted in our pages (arq 1/1 and 2), Philip Tabor wrote a leader entitled ‘Design is research: is it?’ He asked whether ‘a design submission, entirely drawn and unaccompanied by text, would be awarded a research degree in architecture? Or, closer to home, would arq’s editor and referees, accept it for publication?’ The answer he concluded, was ‘Probably not.’ Six years on, ‘From table to basin’ represents a shift in editorial policy and a demonstration of the way in which designers can reflect upon their work as research in a way that journalists cannot.


2012 ◽  
Vol 566 ◽  
pp. 281-287
Author(s):  
Hui Jun Wang ◽  
You De Li

In order to deign an electric assistance power steering system (EPS), in this thesis, after analysis the dynamics of EPS system, a model of EPS System is established, and combined with the characteristic of EPS system, a PID controller with emendation function in series is designed. From the test result, this control strategy with the arithmetic, can be found, have made a good effect for lighten the handle force and heighten the return back at middle position.


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