Suppression of Train Wheel Squeal Noise by Shunted Piezoelectric Elements

2017 ◽  
Vol 17 (02) ◽  
pp. 1750027 ◽  
Author(s):  
Seyed Rahim Marjani ◽  
Davood Younesian
Keyword(s):  
Lateral Displacement ◽  
Contact Point ◽  
Piezoelectric Element ◽  
Control Performance ◽  
Frequency Range ◽  
Complete Model ◽  
Noise Mitigation ◽  
Piezoelectric Elements ◽  
Squeal Noise ◽  
Limiting Value

Application of the piezoelectric patch to mitigate the train wheel squeal is presented in this paper. A complete model for the wheel, rail and foundation is employed in the frequency domain. The wheel squeal model with the shunted piezoelectric element is presented and the consequent added damping is calculated for the critical frequencies. Two different shunt circuits including the resistor ([Formula: see text] and resistor–inductor (RL) are applied and the consequent performances in the noise mitigation are evaluated for different frequencies. The effect of contact point lateral displacement on occurrence of the wheel squeal is investigated. In the parametric study, the effects of shunting circuit and its parameters, size, position and number of piezoelectric elements on the control performance are evaluated. It is found that the resistance shunt circuit has optimal performance when the added damping over a broadband frequency range is implemented. In addition, both the added damping and added damping per piezoelectric volume become saturated by increasing the number of piezoelectric patches further over a specific limiting value.

A Novel Method to Search for the Wheel–Rail Contact Point

2019 ◽  
Vol 19 (11) ◽  
pp. 1950142 ◽  
Author(s):  
Hanyun Liu ◽  
Zhiwu Yu ◽  
Wei Guo ◽  
Lizhong Jiang ◽  
Chongjie Kang
Keyword(s):  
Minimum Distance ◽  
Lateral Displacement ◽  
Contact Point ◽  
Normal Contact ◽  
Novel Method ◽  
Maximum Penetration ◽  
Vertical Contact ◽  
Judgment Condition ◽  
Searching Method ◽  
Root Contact

This paper proposed the normal contact searching method (NCSM), a novel method to search for the wheel–rail contact point, which utilizes the normal maximum penetration distance between wheel and rail as the judgment condition. The contact point found by the NCSM can better represent the center of the wheel–rail contact patch which is considered more reasonable than the commonly used vertical contact searching method (VCSM), the latter adopts the vertical minimum distance to determine the wheel–rail contact point. The differences between these two methods are analyzed and compared for the same contact point situation and with same motion parameters. The results show that, for the Chinese LMA wheelset and CHN60 rail profiles, these two methods have slight differences for the same contact point situation. For a wheelset with a lateral displacement less than 7.0[Formula: see text]mm and with no yawing, the NCSM’s contact point is very close to VCSM’s, so both methods are suitable for the dynamic calculation. For a wheelset with a lateral displacement greater than 7.0[Formula: see text]mm or with yawing, an unreasonable jump occurs at the wheel–rail contact point and wheelset angle root contact by applying VCSM, while the NCSM has only small discrete jump on the wheelset tread contact. In this case, the NCSM instead of VCSM should be used in the dynamic analysis.

scholarly journals Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 614
Author(s):  
Hsiao Mun Lee ◽  
Andi Haris ◽  
Kian Meng Lim ◽  
Jinlong Xie ◽  
Heow Pueh Lee
Keyword(s):  
White Noise ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Experimental Results ◽  
Frequency Range ◽  
Noise Mitigation ◽  
Noise Sources ◽  
Acoustic Performance ◽  
Common Noise ◽  
The Common

In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. The entire studies were conducted in a reverberation room. The effectiveness of jagged flap on mitigating diffracted sound was also studied. Three types of noises were examined in the current study—white noise, traffic noise and construction noises. The experimental results showed that the plenum window with perforated thin box could reduce 8.4 dBA, 8.7 dBA and 6.9 dBA of white, traffic and construction noises, respectively. The jagged flaps did not have significant effect on the plenum window’s noise mitigation performance. When frequencies were ranging from 800 Hz to 1250 Hz, when compared with the case of without perforated thin box, it was found that the perforated thin box had good acoustic performance where it was able to reduce additional 1.6 dBA, 1.6 dBA and 1.2 dBA of white, construction and traffic noises, respectively.

Application of a Negative Capacitance Circuit in Synchronized Switch Damping Techniques for Vibration Suppression

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Hongli Ji ◽  
Jinhao Qiu ◽  
Jun Cheng ◽  
Daniel Inman
Keyword(s):  
Composite Beam ◽  
Vibration Suppression ◽  
Piezoelectric Element ◽  
Single Mode ◽  
Resonant Circuit ◽  
Negative Capacitance ◽  
Control Performance ◽  
Damping Effect ◽  
Mode Control ◽  
Shunt Circuit

In the synchronized switching damping (SSD) techniques, the voltage on the piezoelectric element is switched synchronously with the vibration to be controlled using an inductive shunt circuit (SSDI). The inherent capacitance and the inductance in the shunt circuit comprise an electrically resonant circuit. In this study, a negative capacitance is used in the shunt circuit instead of an inductance in the traditional SSD technique. The voltage on the piezoelectric element can be effectively inverted although the equivalent circuit is capacitive and no resonance occurs. In order to investigate the principle of the new SSD method based on a negative capacitance (SSDNC), the variation of the voltage on the piezoelectric element and the current in the circuit are analyzed. Furthermore, the damping effect using the SSDNC is deduced, and the energy balance and stability of the new system are investigated analytically. The method is applied to the single-mode control and two-mode control of a composite beam, and its control performance was confirmed by the experimental results. For the first mode in single-mode control, the SSDNC is much more effective than SSDI. In other cases, the SSDNC is also more effective than the SSDI, although not significantly.

Truss Structure Health Monitoring Based on Electromechanical Impedance Method

2013 ◽  
Vol 330 ◽  
pp. 357-363
Author(s):  
Cun Fu He ◽  
Xiao Ming Cai ◽  
Shen Yang ◽  
Zeng Hua Liu ◽  
Bin Wu
Keyword(s):  
Neural Network ◽  
Health Monitoring ◽  
Truss Structure ◽  
Truss Structures ◽  
Impedance Method ◽  
Nonparametric Model ◽  
Impedance Spectra ◽  
Frequency Range ◽  
Electromechanical Impedance ◽  
Piezoelectric Elements

Truss structure is widely used in civil engineering applications for its advantages of easy transportation, convenient assembly and uniform loading. However, it is difficult to achieve real-time health monitoring because of connection diversity and complexity of truss structures. As a novel structural health monitoring technique, electro-mechanical impedance method could monitor the health state of one structure by measuring the spectra of impedance or admittance of the piezoelectric elements, which are bonded on the surface of this structure. This approach has the advantages of nonparametric model analysis, easy sensor installation and high local sensitivity, especially in sensitive frequency range. The damage information, which is tested and recorded by using electromechanical impedance method, could convert into intuitive results through neural network because of its good ability for nonlinear mapping. In this paper, a three-layer assembly truss structure was chosen as experimental object, piezoelectric elements were bonded on structure joints to measure structural impedance spectra, the change of these structural impedance spectra was tested and recorded under high frequency excitations when different truss bars were loosed, and then, one back-propagation (BP) neural network was built and trained by this damage information, which were treated as input samples. These results show that the sensitivity of impedance method is not the same to different frequency range and trained neural network could quickly identify loosen truss bars.

scholarly journals Use of piezoelement in ultrasound generation

2021 ◽  
Vol 289 ◽  
pp. 07027
Author(s):  
Shakhnoza Sultanova ◽  
Jasur Safarov ◽  
Azamat Usenov ◽  
Kamola Samatova
Keyword(s):  
Electronic Devices ◽  
Piezoelectric Element ◽  
Frequency Characteristics ◽  
Piezoelectric Transducers ◽  
Electrical Model ◽  
Advantages And Disadvantages ◽  
Piezoelectric Elements ◽  
Electromechanical Transducers

At present, ultrasonic (piezoelectric) transducers are the most promising electromechanical transducers for use in miniature electronic devices. However, the calculation of the piezoelectric element for an ultrasonic environment poses certain problems due to the large number of problems to be solved and its nonlinearity. The article describes the principles of operation of the piezoelectric element, analyzes their advantages and disadvantages, gives the characteristics of the piezoelectric elements, as well as proposes an algorithm for calculating the frequency characteristics of the piezoelectric element based on the electrical model of the piezoelectric element.

scholarly journals Modelling vibrations of axial piezoelectric generator with active base

2021 ◽  
Vol 2131 (2) ◽  
pp. 022018
Author(s):  
R K Haldkar ◽  
I A Parinov ◽  
A V Cherpakov ◽  
O V Shilyaeva
Keyword(s):  
Proof Mass ◽  
Mechanical Vibration ◽  
Electrical Energy ◽  
Cylindrical Shape ◽  
Frequency Range ◽  
Piezoelectric Generator ◽  
Piezoelectric Elements ◽  
Compressive Loads ◽  
Output Characteristics ◽  
Active Base

Abstract Modelling of an axial-type piezoelectric generator (PEG) is considered. PEG is an integral part of the system for converting mechanical vibration energy from the environment into electrical energy. The energy generator has an axial type of the configuration of elements, aimed on using bending and compressive loads simultaneously on piezoelectric elements. The base of the generator is made as an active pinching. A feature of PEG is that the generator has two types of piezoelectric elements: (1) elements located on the substrate in the form of a bimorph and (2) piezoelectric elements of a cylindrical shape, fixing the generator base, located on the same axis. PEG has a symmetrical structure about the center of proof mass. The results of modal and harmonic analysis of vibrations are given for vibration excitation of the PEG base in a certain frequency range. The analysis of the output characteristics is given.

A New Approach for Piezoelectric Switched Shunt Damping on Inductance

2015 ◽  
Author(s):  
Keisuke Kamiya
Keyword(s):  
High Performance ◽  
Vibration Suppression ◽  
Piezoelectric Element ◽  
Open Circuit ◽  
New Approach ◽  
Piezoelectric Elements ◽  
In Series ◽  
Shunt Damping ◽  
Piezoelectric Shunt ◽  
Shunt Circuit

A technique to suppress vibration using piezoelectric elements connected to a shunt circuit is called piezoelectric shunt damping. Many studies on this subject have been reported. Among them a technique called switched shunt damping exists. In switched shunt damping developed so far, a switch is placed in the shunt circuit in series to the piezoelectric element, and is used to switch the shunt circuit from an open circuit to a closed circuit. Depending on the elements used in the shunt circuit, various types of switched shunt damping exist. This paper presents a new approach for switched shunt damping on inductance. The presented shunt circuit is composed of a resistance, an inductance and a switch connected in parallel with the inductance. Thus, when the switch is open the shunt circuit becomes an LR circuit, and when the switch is closed it becomes a resistive circuit. Furthermore, switching is operated based on the charge on the piezoelectric element, so that no sensors to conduct the switching are needed. To check the performance of vibration suppression by the proposed method, numerical simulations and experiments are conducted. The results show that the presented switched shunt damping have high performance of vibration suppression.

scholarly journals Performance Analysis of Piezoelectric Actuators in Railway Wheel Squealing Noise Mitigation

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Seyed Rahim Marjani ◽  
Davood Younesian
Keyword(s):  
Sound Pressure ◽  
Near Field ◽  
Pressure Level ◽  
Contact Forces ◽  
Railway Track ◽  
Noise Mitigation ◽  
Method Performance ◽  
The Time Domain ◽  
Squeal Noise ◽  
Railway Wheels

Application of a shunted piezoelectric system in reduction of the squeal noise level in railway wheels is studied. A wheel squeal model including the railway track, wheel, and nonlinear interaction contact forces is taken into account in the time domain. Consequent vibration of the wheel is calculated at incident of sharp curve passing. The sound pressure level (SPL) of the noise is then calculated by an analytical method. Performance of different shunt circuits including the R (resistance) and RL (resistance inductance) is evaluated in different frequency ranges. A new methodology is proposed to achieve multimode damping. According to results, the SPL of wheel squeal noise can effectively get reduced by the proposed method, up to 5 dB at near-field and 10 dB at far-field.

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