scholarly journals A Thickness-Mode High-Frequency Underwater Acoustic Transducer with a Low Sidelobe Level

Actuators ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 226
Author(s):  
Hui Zhao ◽  
Haisen Li ◽  
Yan Wang ◽  
Zhenjun Liu ◽  
Jiacong Bian ◽  
...  
Keyword(s):  
High Frequency ◽  
Vibration Mode ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Voltage Response ◽  
Sidelobe Level ◽  
Element Simulation ◽  
Low Sidelobe ◽  
Acoustic Transducer ◽  
High Frequency Transducer

Thickness vibration mode is commonly used for high-frequency transducers. For disc piezoelectric ceramics, there is no ideally pure thickness vibration mode because the coupling between the radial and thickness modes always exists. Furthermore, it also deteriorates the transmission voltage response and directivity of the high-frequency transducer. In this paper, based on the theoretical calculation and finite element simulation method, a new method was proposed, and the related experiment was carried out to convince this idea. Both the simulation analysis and experimental results show that drilling a hole at the center of piezoelectric vibration is a simple but effective method to obtain a pure thickness vibration mode of the disc piezoelectric ceramic, and then improve the transmitting ability and directivity of the high-frequency piezoelectric transducer. The sidelobe level is as low as −21.3 dB.

A Research of Shaft Modal Simulation Method Based on the Preloaded Angular Contact Ball Bearing

2013 ◽  
Vol 389 ◽  
pp. 364-370
Author(s):  
Bei Li ◽  
Jian Bin Zhang ◽  
Lu Sha Jiang
Keyword(s):  
Simulation Analysis ◽  
Simulation Method ◽  
Numerical Control ◽  
Angular Contact Ball Bearing ◽  
Tightening Force ◽  
Shaft System ◽  
Element Simulation ◽  
Rolling Element ◽  
Bearing Stiffness ◽  
Main Spindle

In order to analysis modal characteristic of bearing with pre-tightening force on main spindle of numerical control lathe, this paper proposes a model of spindle modality analysis. This model is used to simulate the preloaded bearing shaft system modal, and the simulation results are verified by modal experiment. This paper takes 7005c as the research object to establish the equivalent-spring model based on the Hertz theory considering the pre-tightening force, whose focus is dealing with the contact between bearings rolling element and raceway. Then the model will be used to get the bearing stiffness for finite element simulation analysis. The shafting modal with preloaded bearing test platform is structured to get the shaft system modal parameters, which is compared with and verified the simulation analysis.

scholarly journals Research and Fabrication of High-Frequency Broadband and Omnidirectional Transmitting Transducer

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2347 ◽  
Author(s):  
Shaohua Hao ◽  
Hongwei Wang ◽  
Chao Zhong ◽  
Likun Wang ◽  
Hao Zhang
Keyword(s):  
Composite Material ◽  
High Frequency ◽  
Wide Band ◽  
Simulation Software ◽  
Piezoelectric Composite ◽  
Voltage Response ◽  
Forming Process ◽  
Composite Ring ◽  
Matching Layer ◽  
Acoustic Transducer

A wide-band cylindrical transducer was developed by using the wide band of the composite material and the matched matching layer for multimode coupling. Firstly, the structure size of the transducer’s sensitive component was designed by using ANSYS simulation software. Secondly, the piezoelectric composite ring-shaped sensitive component was fabricated by the piezoelectric composite curved-surface forming process, and the matching layer was coated on the periphery of the ring-shaped piezoelectric composite material. Finally, it was encapsulated and the electrodes were drawn out to make a high-frequency broadband horizontal omnidirectional water acoustic transducer prototype. After testing, the working frequency range of the transducer was 230–380 kHz, and the maximum transmission voltage response was 168 dB in the water.

Simulation Analysis of Matrix Cone Angle in Ironing Stretch Technology of Two-Piece Can

2013 ◽  
Vol 455 ◽  
pp. 511-516
Author(s):  
Hong Bo Li ◽  
Yuan Wei Yuan ◽  
Jie Zhang ◽  
Xiao Jun Chai ◽  
Bing Sheng Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Simulation Analysis ◽  
Cone Angle ◽  
Simulation Method ◽  
Element Simulation ◽  
Reasonable Range ◽  
Abaqus Software

Matrix cone angle is an important parameter in the ironing stretch process of two-piece can body. On the base of analyzing the ironing stretch technology, finite element simulation method with ABAQUS software was applied to simulate ironing stretch process of can body, the influence of matrix cone angle on ironing stretch technology was analyzed quantitatively, and then the reasonable range of matrix cone angle was recommended. The result indicated that the best range of matrix cone angle is 6°~9°, which can provide reference for the mould optimization and technology formulation.

scholarly journals Research on Simulation Analysis Method of Microbial Cemented Sand Based on Discrete Element Method

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yang Tang ◽  
Guobin Xu ◽  
Jijian Lian ◽  
Yue Yan ◽  
Dengfeng Fu ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Moment Tensor ◽  
Simulation Method ◽  
Discrete Element ◽  
Particle Flow Code ◽  
Discrete Element Simulation ◽  
Cemented Sand ◽  
Physical Experiments ◽  
Element Simulation ◽  
Probability Of Fracture

A simulation method for microbial cemented sand (MCS) based on the Two-Dimensional Particle Flow Code (PFC 2D) has been developed in this study. It consists of an identification of mesoscopic contact model for structural mesoscopic particles, development of morphological algorithm for irregular crystal particles, and classification and setting of mesoscopic parameters for compositional materials and particle size distribution simulation. Additionally, an acoustic emission algorithm based on moment tensor theory was developed for discrete element simulation analysis on fracture characteristic of cemented sand under the action of the force. The simulation method proposed in this article/paper may reflect the physical and mechanical characteristics of real microbial cemented sand based on physical experiments. Quantification of the fracture process of microbial cemented sand is possible by introducing a moment magnitude (MW) in discrete element simulation analysis. The material may have greater probability of fracture between the MW ranges of −6.8 and −6.6. The relationship between probability of fracture at different MWs and the MW follows the Gaussian curve. The research results are a new trial for fracture analysis on microbial cemented sand.

scholarly journals High frequency AC electric glow discharge visualization technology and application in big diameter hypersonic low-density wind tunnel

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Wanqiu Jiang ◽  
Huacheng Qiu ◽  
Yanguang Yang ◽  
Yilei Shi ◽  
Jie Wang ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Glow Discharge ◽  
Flow Field ◽  
High Frequency ◽  
Simulation Analysis ◽  
Low Density ◽  
Rarefied Flow ◽  
Element Simulation ◽  
Visualization Technology ◽  
High Frequency Ac

AbstractIn order to visualize the rarefied flow field in a Φ1m hypersonic low-density wind tunnel, an electric glow discharge technique based on high frequency excited power has been developed. Firstly, finite element simulation analysis has been carried out, and it is concluded that the breakdown voltage can be reduced by using high frequency power supply; then an electric glow discharge apparatus has been fabricated, and the discharge images were compared with simulations; besides, a clear flow field around HB-1 standard model has been observed using this technology; finally, the influence of glow discharge on the flow field, as well as the differences between direct current and high frequency electric glow discharges is discussed at the end of this paper.

Measurement and Validation of the Young’s Modulus of Loudspeaker Spider

2014 ◽  
Vol 602-605 ◽  
pp. 1555-1558
Author(s):  
Kai Meng ◽  
Zi Long Zhao
Keyword(s):  
Young’S Modulus ◽  
Virtual Instrument ◽  
Vibration Mode ◽  
Young's Modulus ◽  
Simulation Method ◽  
Element Simulation ◽  
Inherent Frequency ◽  
Instrument Technology ◽  
Simulation Results ◽  
The Difference

This paper proposed a set of measurement system based on the method of stick vibration mode and LabVIEW virtual instrument technology, which is used for measuring the young's modulus of loudspeaker spider. The inherent frequency and young's modulus of a cotton spider are measured by this system. After the young’s modulus is obtained, modal analysis is conducted on the sample by using finite element simulation method. The measured results and the simulation results are compared. The difference between two results is 0.4% which verify the correctness of the system.

scholarly journals Design and Fabrication of a High-Frequency Single-Directional Planar Underwater Ultrasound Transducer

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4336 ◽  
Author(s):  
Qiguo Huang ◽  
Hongwei Wang ◽  
Shaohua Hao ◽  
Chao Zhong ◽  
Likun Wang
Keyword(s):  
High Frequency ◽  
Single Mode ◽  
Simulation Software ◽  
Ultrasound Transducer ◽  
Voltage Response ◽  
Material Models ◽  
Piezoelectric Composites ◽  
Element Simulation ◽  
Working Frequency ◽  
Simulation Results

This paper describes the fabrication of 1-3 piezoelectric composites by using PZT5-A pure piezoelectric ceramics and the preparation of a high-frequency single-directional planar underwater ultrasound transducer by using the developed composites. First, three material models of the same size were designed and simulated by ANSYS finite element simulation software. Next, based on the simulation results, the 1-3 piezoelectric composites were developed. Finally, a high-frequency single-directional planar underwater ultrasound transducer was fabricated by encapsulating and gluing the 1-3 piezoelectric composites. The performance of the transducer was tested, and results showed that the device was characterized by single-mode operation in the working frequency band, a high transmitting voltage response, and single directivity.

Design front rake angle of PDC bit based on SolidWorks simulation method

2016 ◽  
Vol 1 (3) ◽  
pp. 627 ◽  
Author(s):  
Xiaoming HAN ◽  
Chenxu LUO ◽  
Xingyu HAN
Keyword(s):  
Hard Rock ◽  
Simulation Analysis ◽  
Soft Rock ◽  
Polycrystalline Diamond ◽  
Simulation Method ◽  
Rake Angle ◽  
Element Simulation ◽  
Pdc Bit ◽  
Coal Rock ◽  
Polycrystalline Diamond Compact

<span lang="EN-US">In order to solve the bit front rake angle parameter selection problem of under different coal rock, it is proposed in polycrystalline diamond compact no core bit as the research object, and established a bit compact two-dimensional stress model of cutting teeth. The result shows that the front rake angle is the factor of cutting force and the drilling efficiency. Application of SolidWorks simulation carries out the finite element simulation analysis respectively to different front rake angle of bit model under the condition of soft rock and hard rock. Form the simulation it concludes that under the condition of soft rock and hard rock, the optimal front rake angle is 10° and 15° respectively. It is obtained that the strength of the bit is largest and the life is longest on the best front rake angle of bit.</span>

Stress Wave Propagation Discipline and Simulation Analysis in Non-Homogeneous Laminated Composites

2011 ◽  
Vol 211-212 ◽  
pp. 823-826
Author(s):  
Jia Yao ◽  
Wan Jiang Wu ◽  
Ya Qin Li ◽  
Ming Hui Han ◽  
Li Wei Jiang
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Simulation Analysis ◽  
Laminated Composites ◽  
Wave Theory ◽  
Simulation Method ◽  
Stress Wave Propagation ◽  
Destructive Testing ◽  
Element Simulation ◽  
Non Destructive

Application of stress wave testing methods can realize non-destructive testing of composites, but non-homogeneous characteristics of composites determine the complexity of stress wave propagation. Using the stress wave theory to explain the propagation principle, to describe the stress situation in the composites, which is meaningful to perfect the stress wave testing method. In this paper, stress wave propagation principle of non-homogeneous laminated composites has been revealed, mathematical descriptions of stress wave propagation are also given, and finite element simulation method has been used to verify the theory.

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