scholarly journals Design of an Acoustic Bender Transducer for Active Sonobuoys

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1691 ◽  
Author(s):  
Pyo ◽  
Shim ◽  
Roh
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Performance ◽  
Structural Parameters ◽  
Underwater Vehicles ◽  
Acoustic Properties ◽  
Voltage Response ◽  
Sound Waves ◽  
The Finite Element Method ◽  
High Detection

Recent underwater vehicles can operate with a much lower level of noise, which increases the need for an active sonobuoy with a high detection performance. These active sonobuoys mainly use bender transducers as a projector that emits sound waves. In this study, we designed a high-performance bender transducer and verified the validity of the design through experiments. For this purpose, first we analyzed the variation of the peak transmitting voltage response (TVR) level and peak TVR frequency of the bender transducer, in relation to its structural parameters. The performance of the bender transducer was analyzed using the finite element method. Then we derived the optimal structure of the bender transducer to achieve the highest TVR. Based on the design, a prototype of the bender transducer was fabricated and its acoustic properties were measured to confirm the validity of the design.

The Structural Analysis and Rapid Optimization for High-Speed Spindle Box

2011 ◽  
Vol 199-200 ◽  
pp. 1269-1272
Author(s):  
Huai Xing Wen ◽  
Lu Jun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Optimal Design ◽  
Design Process ◽  
High Speed ◽  
Structural Parameters ◽  
The Finite Element Method ◽  
Target Setting ◽  
Fuzzy Constraints

Through the optimization of the design process, the application of the finite element method and the structural parameters design have avoided blindness of product design, reduced unnecessary waste, waste of material and time for example. The fuzzy constraints has been determined by the sensitivity calculation , and the use numerical method and procedures of chart to analyze and compare, the target setting in the specified range has been searched for the structure. Thus the optimal design got achieved.

Belt Construction Optimization for Tire Weight Reduction Using the Finite Element Method

1993 ◽  
Vol 21 (2) ◽  
pp. 120-134 ◽  
Author(s):  
M. Weiss ◽  
S. Tsujimoto ◽  
H. Yoshinaga
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Weight Reduction ◽  
High Speed ◽  
High Performance ◽  
Ride Comfort ◽  
Rolling Resistance ◽  
The Finite Element Method ◽  
Belt Width ◽  
Element Method

Abstract The influence of five belt constructions on high speed endurance, ride comfort, and rolling resistance was investigated for a high performance 225/50R16 92V radial passenger car tire, using the finite element method. The belt constructions were combinations of belt edge shapes (cut, folded) and reinforcement materials (steel, aramid). The goal was to find optimized belt constructions for tire weight reduction, considering important tire properties like high speed endurance, ride comfort, and rolling resistance. A full aramid belt construction with a folded belt around a cut belt was chosen for design parameter variation calculations to reduce rolling resistance. This leads to a tire with smaller belt width, increased folding width, additional center cap ply, and reduced non-skid base and depth. The effect of inflation pressure and speed on rolling resistance was evaluated for this construction.

scholarly journals A study of vectorization for matrix-free finite element methods

2020 ◽  
Vol 34 (6) ◽  
pp. 629-644
Author(s):  
Tianjiao Sun ◽  
Lawrence Mitchell ◽  
Kaushik Kulkarni ◽  
Andreas Klöckner ◽  
David A Ham ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Performance ◽  
Practical Significance ◽  
Peak Performance ◽  
The Finite Element Method ◽  
Wide Range ◽  
Local Assembly ◽  
Matrix Free ◽  
Element Method

Vectorization is increasingly important to achieve high performance on modern hardware with SIMD instructions. Assembly of matrices and vectors in the finite element method, which is characterized by iterating a local assembly kernel over unstructured meshes, poses difficulties to effective vectorization. Maintaining a user-friendly high-level interface with a suitable degree of abstraction while generating efficient, vectorized code for the finite element method is a challenge for numerical software systems and libraries. In this work, we study cross-element vectorization in the finite element framework Firedrake via code transformation and demonstrate the efficacy of such an approach by evaluating a wide range of matrix-free operators spanning different polynomial degrees and discretizations on two recent CPUs using three mainstream compilers. Our experiments show that our approaches for cross-element vectorization achieve 30% of theoretical peak performance for many examples of practical significance, and exceed 50% for cases with high arithmetic intensities, with consistent speed-up over (intra-element) vectorization restricted to the local assembly kernels.

The Analysis of Vibration for Ballastless Track-Bridge Base on a Hybrid FE-SEA Method

2013 ◽  
Vol 405-408 ◽  
pp. 3213-3217
Author(s):  
Wen Jun Luo ◽  
Xiao Yan Lei ◽  
Song Liang Lian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Analysis ◽  
High Performance ◽  
Beam Model ◽  
The Finite Element Method ◽  
Frequency Method ◽  
Ballastless Track ◽  
Track Bridge ◽  
Element Method

In this study, the methods for combining statistical energy analysis (SEA) and the finite element method (FEM) for the vibration analysis of structures are studied. Using the two methods simultaneously isnt entirely extend a primarily low frequency method, the finite element method, and high frequency method, SEA, to the mid frequency region are addressed. This approach is intended to extend the frequency range for a FEM based vibration analysis . A new finite element elementl for elevated slab ballastless track is proposed in which the new model can be used for modeling the track structural constituents of elevated slab ballastless track. Using finite element method and Hamilton theory, the coupled equation of vehicle-track-bridge can be established. In calculating example, both the rail displacement induced by single four-layer beam model. Specifically, it showed that the method yields very good result and high performance in the numerical example of previous research.

scholarly journals Finite Element Calculation with Experimental Verification for a Free-Flooded Transducer Based on Fluid Cavity Structure

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3128
Author(s):  
Zhengyao He ◽  
Geng Chen ◽  
Yun Wang ◽  
Kan Zhang ◽  
Wenqiang Tian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Voltage Response ◽  
Water Tank ◽  
The Finite Element Method ◽  
Cavity Structure ◽  
Radiation Directivity ◽  
Element Method

A free-flooded transducer that couples the vibration of a longitudinal vibration transducer and the fluid cavity of an aluminum ring was investigated. Given the transducer is based on a fluid cavity structure and has no air cavity, it can resist high hydrostatic pressure when working underwater, which is suitable for application in the deep sea. At first, the structure and working principle of the transducer were introduced. Then, the axisymmetric finite element model of the transducer was established; and the transmitting voltage response, admittance, and radiation directivity of the transducer were simulated using the finite element method. According to the size of the finite element model, a prototype of the transducer was designed and fabricated, and the electro-acoustic performance of the prototype was measured in an anechoic water tank. The experimental results were consistent with the simulation results and showed a good performance of the transducer. Finally, the improvement of the radiation directivity of the transducer by the optimal design of the free-flooded aluminum ring was obtained using the finite element method and verified by experiments.

scholarly journals Research on sound absorption performance and optimal design of acoustic materials containing cavity structure

2021 ◽  
Vol 336 ◽  
pp. 01001
Author(s):  
Hao Song ◽  
Zixian Cui ◽  
Jun Li ◽  
Buchao An
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sound Absorption ◽  
Internal Cavity ◽  
Sound Waves ◽  
The Finite Element Method ◽  
Cavity Structure ◽  
Calculation Results ◽  
Absorption Performance ◽  
Absorption Characteristics

Based on the finite element method, this paper first discusses the sound absorption characteristics of acoustic materials with a cavity structure backed by air, and then takes the internal cavity of the acoustic material and the acoustic material as the research object, considering the sound waves of different frequencies and different incident angles. The maximum sound absorption coefficient is used as the objective function to optimize the design of the cavity acoustic material. The calculation results show that the sound absorption performance of the optimized acoustic material has been significantly improved.

Dynamics Analysis of the Bar-Type Piezoelectric Motor Stator

2011 ◽  
Vol 117-119 ◽  
pp. 390-393
Author(s):  
Huai Yong Li ◽  
Li Zhong Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Basis ◽  
Optimization Design ◽  
Structural Parameters ◽  
Structure Optimization ◽  
Dynamics Analysis ◽  
Ceramic Plate ◽  
Piezoelectric Motor ◽  
The Finite Element Method

In this paper, the modal and the harmony response analyses of the stator of the bar-type piezoelectric motor are done by using the finite element method. The influences of the motor’s structural parameters and the voltage applied to ceramic plate on the characteristics of the stator are discussed. Some useful results are given. This provides theoretical basis for the structure optimization design of the motor.

scholarly journals Comparative Structural Analysis of Flexible Pavements Using Finite Element Method

2014 ◽  
Vol 15 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Ankit Gupta ◽  
Abhinav Kumar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Parameters ◽  
Flexible Pavements ◽  
Vertical Surface ◽  
Major Type ◽  
The Finite Element Method ◽  
Tensile Strains ◽  
Surface Deflections ◽  
Element Method

ABSTRACT The evaluation of bituminous concrete mixes for their tendency to rutting has been an important research field for many years. Rutting is a major type of distress encountered in bituminous pavements. The Finite Element Method (FEM) is a numerical analysis technique to obtain various structural parameters such as stress, strain and deflection of pavement layers. The objective of this paper is to study the sensitivity of these variables in reducing the vertical surface deflections, the critical tensile strains at the bottom of the bitumen layer and the critical compressive strains on the top of subgrade using the finite element method. This study has been carried out in order to compare the performance of flexible pavement using the finite element method and KENLAYER. Vertical surface deflections in flexible pavements have always been a major concern and are used as a criterion for pavement design. It is desirable to reduce the deflections as much as possible. This paper deals with ways to reduce deflections by varying the design configuration, such as increasing the Hot Mix Asphalt (HMA) modulus, the base modulus, sub base modulus and the subgrade modulus. Another objective of the present study is to investigate the effectiveness of two different methods in reducing vertical surface deflections (wo) and the critical tensile strains in the bitumen layer (εt) or the radial strains at the bottom layer of HMA. The finite element method was adopted to evaluate the effectiveness of the two methods and the sensitivity of various factors

scholarly journals THE DETERMINATION OF THE STRUCTURAL PARAMETERS OF MECHANICAL ENGINEERING PRODUCTS BY THE FINITE ELEMENT METHOD

2019 ◽  
Vol 4 (2) ◽  
pp. 149-155 ◽  
Author(s):  
Ирина Тетерина ◽  
Irina Teterina ◽  
Анна Авдеева ◽  
Anna Avdeeva ◽  
Анна Авдеева ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Engineering ◽  
Structural Parameters ◽  
The Finite Element Method ◽  
Element Method
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