scholarly journals Design and Analysis of Two Piezoelectric Cymbal Transducers with Metal Ring and Add Mass

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 137 ◽  
Author(s):  
Wenjie Wang ◽  
Weihao Shi ◽  
Peter Thomas ◽  
Mingsui Yang
Keyword(s):  
Simulation Analysis ◽  
Low Frequency ◽  
High Strength ◽  
Structural Parameter ◽  
Metal Ring ◽  
Cavity Structure ◽  
Good Consistency ◽  
Frequency Transducer ◽  
Detailed Simulation ◽  
Transducer Design

Based on traditional sandwich structure, two piezoelectric transducers were designed to meet the strict underwater application backgrounds such as high pressure, corrosion resistance, and high strength. Both transducers integrated most of previous researches while one transducer has a multilayer cavity structure which is different from the other structure and previous transducer structures. After a detailed simulation analysis of every structural parameter, key parameters were pointed out to have an obvious influence on its performance. Then, two models were constructed and compared with chosen sets of geometry parameters and manufacturing process, which can also provide a reference for low-frequency transducer design. The simulation results and experimental results of our transducers show a good consistency which indicates the cavity structure can reduce the resonance frequency.

Calculation and Analysis of Acoustic Performance of Diesel Engine 3-in-1 after Treatment Device

2013 ◽  
Vol 726-731 ◽  
pp. 3119-3122
Author(s):  
Zhen Dong Zou ◽  
Yan Ni ◽  
Zhe Jiang
Keyword(s):  
Diesel Engine ◽  
Insertion Loss ◽  
Transmission Loss ◽  
Perforated Plate ◽  
Low Frequency ◽  
Good Effect ◽  
Structural Parameter ◽  
Acoustic Performance ◽  
Cavity Structure ◽  
Perforated Pipe

Taking the 3-in-1 after treatment device of a diesel engine produced by FAW Jiefang Automotive CO., Ltd as an example, the acoustic finite element method of software Virtual.Lab is used to analysis the transmission loss and insertion loss, then analysis the acoustic performance of its substructure. The results show that the heat exchange tube has little effect on acoustic performance of the entire device; The silencer module of multi-cavity structure can significantly improve the performance in low-frequency. Perforated plate and perforated pipe have effect on improving medium-high frequency, and changes of structural parameter affect its acoustic characteristics; The comparison between direct simulation results of insertion loss and the experimental results has a good effect.

scholarly journals A Novel Method for Estimating and Balancing the Second Harmonic Error of Cylindrical Fused Silica Resonators

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 380
Author(s):  
Yunfeng Tao ◽  
Yao Pan ◽  
Jianping Liu ◽  
Yonglei Jia ◽  
Kaiyong Yang ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Second Harmonic ◽  
Low Frequency ◽  
Fused Silica ◽  
Cylindrical Resonator ◽  
Bias Drift ◽  
Good Consistency ◽  
Manufacturing Errors ◽  
Frequency Split ◽  
Novel Method

The cylindrical resonator gyroscope (CRG) is a type of Coriolis vibratory gyroscope which measures the angular velocity or angle through the precession of the elastic wave of the cylindrical resonator. The cylindrical fused silica resonator is an essential component of the CRG, the symmetry of which determines the bias drift and vibration stability of the gyroscope. The manufacturing errors breaking the symmetry of the resonator are usually described by Fourier series, and most studies are only focusing on analyzing and reducing the fourth harmonic error, the main error source of bias drift. The second harmonic error also is one of the obstacles for CRG towards high precision. Therefore, this paper provides a chemical method to evaluate and balance the second harmonic error of cylindrical fused silica resonators. The relation between the frequency split of the n = 1 mode and the second harmonic error of the resonator is obtained. Simulations are performed to analyze the effects of the first three harmonic errors on the frequency splits. The relation between the location of the low-frequency axis of n = 1 mode and the heavy axis of the second harmonic error is also analyzed by simulation. Chemical balancing experiments on two fused silica resonators demonstrate the feasibility of this balancing procedure, and show good consistency with theoretical and simulation analysis. The second harmonic error of the two resonators is reduced by 86.6% and 79.8%, respectively.

The Structural Properties Research of Piezoelectric Cantilever Beam Based on Vehicular Environment

2014 ◽  
Vol 525 ◽  
pp. 342-345
Author(s):  
Yan Zhao ◽  
Shan Shan Liu ◽  
Yu Feng Li
Keyword(s):  
Cantilever Beam ◽  
Simulation Analysis ◽  
Low Frequency ◽  
Electrical Energy ◽  
Body Vibration ◽  
Low Frequency Vibration ◽  
Generating Capacity ◽  
Nature Frequency ◽  
Beam Parameters ◽  
Vibration Simulation

The piezoelectric power generating device can convert the vibration energy into electrical energy in vehicular environment. So it can provide energy for electronic components. Firstly, the mathematical model of road-vehicles-piezoelectric device coupled vibration was established under the random road excitation. Then vibration simulation analysis of the established model was made. The acceleration and spectrum of the vehicles body and its connection with the suspension were researched under B-class. The car body vibration is low-frequency vibration. Further studies shows that expanding the speed range and changing the roads level almost have no effect on the natural frequency of vehicles body vibration. Secondly, in order to make the maximum generating capacity, the influences of cantilever beam parameters have on its nature frequency were researched. The research results provide basis for parameters design in cantilever beam.

Roof Cover Impact on Cooling Energy Use of Office Buildings

2014 ◽  
Author(s):  
Moncef Krarti
Keyword(s):  
Energy Use ◽  
Energy Savings ◽  
Simulation Analysis ◽  
Calculation Model ◽  
Office Building ◽  
Climate Zones ◽  
Building Energy Use ◽  
Detailed Simulation ◽  
Simplified Calculation ◽  
The Impact

This paper analyzes the impact of roof covers on office building energy use for representative US climate zones. In particular, the study presented in the paper investigates the potential annual cooling energy use savings that roof covers could provide using whole-building simulation analysis to evaluate the performance of a 2-story office building in five US locations. Three parameters of the roof covers including their size, height, and transmittance, are considered in the analysis. The simulation results indicate that while roof covers had similar affects on buildings in all climate zones, their impact in reducing cooling energy usage is different and is more pronounced in cooler climates. Specifically, roof covers could potentially achieve cooling energy savings of up to: 25% in Houston, 33% in Atlanta, 31% in Nashville, 38% in Chicago, and 41% in Madison. Based on the detailed simulation analysis results, a simplified calculation model is developed to help the estimation of cooling energy savings as a function of the roof cover size, height, and transmittance.

scholarly journals Fatigue characteristics of welded high strength steel in the low cycle region of loading

2019 ◽  
Vol 254 ◽  
pp. 07002
Author(s):  
Peter Kopas ◽  
Milan Sága ◽  
Marián Handrik ◽  
Milan Vaško ◽  
Lenka Jakubovičová
Keyword(s):  
Low Frequency ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Loading Frequency ◽  
Fuel Savings ◽  
Fatigue Characteristics ◽  
Structural Parts ◽  
The One ◽  
Metal Welding

Automotive industry is the one of the most rapidly developing sector of engineering. Using of new, progressive materials can make significant benefits because of growing durability and reducing weight of structural parts, which can lead to the materials and fuel savings. The authors of this paper discuss fatigue characteristics on arc metal welding process of high strength steels STRENX 700MC obtained in low cycle region (N approximate to 1.10(3) divided byN= 1.10(7) cycles) at low-frequency loading (frequency approximate to 35 Hz, T = 20 +/5 degrees C,R= -1). Authors compares results of their own experimental works and subsequently discus these result and their possible effect on the fatigue lifetime of these steels.

scholarly journals Comparison of the Economy and Controllability of Pressure Swing Distillation with Two Energy-Saving Modes for Separating a Binary Azeotrope Containing Lower Alcohols

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 730
Author(s):  
Lv ◽  
Li ◽  
Zhang ◽  
Huang
Keyword(s):  
Energy Saving ◽  
Simulation Analysis ◽  
Good Control ◽  
Total Annual Cost ◽  
Control Stage ◽  
Binary Azeotrope ◽  
Detailed Simulation ◽  
Pressure Swing ◽  
Pressure Swing Distillation ◽  
Selection Of

The pressure swing distillation (PSD) with two different energy-saving modes are put forward to separate a binary azeotrope containing lower alcohols: benzene/methanol. A comparison of the economy and controllability for the partial and fully heat integrated pressure swing distillation (HIPSD) is made by detailed simulation analysis. The optimal operating parameters of partial and fully HIPSD processes are obtained by minimizing total annual cost (TAC). These results show that the fully HIPSD mode saves 5.88% TAC compared with the partial HIPSD mode. Meanwhile, this paper proposes that the composition slope profile can help to select the temperature control stage (TCS), when the temperature profile in the column is rising rapidly near the bottom and the maximum of temperature slope value occurs in the bottom of the column. Several control structures are developed to check the rationality of the selection of the TCS and evaluate the industrial application. These results illustrate the composition/temperature cascade control structure for the PSD with two energy-saving modes can both get good control performances, and the purities of benzene and methanol can be brought close back to the initial value. However, the fully HIPSD mode can only handle much smaller composition disturbances (<10%) compared with the partial HIPSD mode. Therefore, the selection of energy-saving modes for the separation process should weigh economy against controllability.

Preliminary Study on the Influence of Wind Power on Low-Frequency Oscillation under Outward Transmitting Thermal Generated Power Bundled with Wind Power Typical Scene

2013 ◽  
Vol 391 ◽  
pp. 271-276
Author(s):  
Peng Li ◽  
Ning Bo Wang ◽  
De Zhi Chen ◽  
Xiao Rong Zhu ◽  
Yun Ting Song
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Wind Farm ◽  
Reactive Power ◽  
Simulation Analysis ◽  
Low Frequency ◽  
Simulation Software ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation

Increasing penetration level of wind power integration has a significant impact on low-frequency oscillations of power systems. Based on PSD-BPA simulation software, time domain simulation analysis and eigenvalue analysis are employed to investigate its effect on power system low-frequency oscillation characteristic in an outward transmitting thermal generated power bundled with wind power illustrative power system. System damping enhances markedly and the risk of low-frequency oscillation reduce when the generation of wind farm increase. In addition, dynamic reactive power compensations apply to wind farm, and the simulation result indicates that it can improve dynamic stability and enhance the system damping.

A Strain Distribution Based Classification of Ortho-Planar Springs: An Outlook to Piezoelectric Applications

2016 ◽  
Author(s):  
R. B. van Kempen ◽  
J. L. Herder ◽  
N. Tolou
Keyword(s):  
Strain Distribution ◽  
Low Frequency ◽  
Plane Motion ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Planar Shape ◽  
Bending Mode ◽  
Frequency Transducer ◽  
Out Of Plane

Ortho-planar springs are characterized by their planar shape and the dominant out of plane motion. These springs have benefits for integration in piezoelectric energy harvesting transducers, because of their compactness and monolithic planar manufacturing. The operating behavior in the first low frequency bending mode can be optimized by obtaining an appropriate strain distribution. A holistic design approach is proposed that contains both the focus on strain distribution as on the low frequency dynamic operation challenge. Therefore a classification based on the strain distribution has been made, which is derived from the perspective of loading, clamping and geometry of single flexures of ortho-planar springs. A comparison based on the type of strain (bending/torsion ratio), strain inversion,off-axis stiffness and the natural frequency-normalized area factor (NFNA) has been performed. The double clamped folded configuration shows the most potential for future optimal low frequency transducer designs.

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