Study on Theoretical Design and Simulation of a Tuned Frequency Muffler

2011 ◽  
Vol 354-355 ◽  
pp. 535-540
Author(s):  
Jian Hua Xiang ◽  
Ri Dong Liao
Keyword(s):  
Finite Element Analysis ◽  
Working Conditions ◽  
Transmission Loss ◽  
Acoustic Attenuation ◽  
Element Analysis ◽  
Theoretical Design ◽  
The Finite Element Analysis ◽  
Selection For ◽  
Application Fields ◽  
Perforated Tube

The criterions of parameter selection for a tuned frequency muffler are proposed. The experimental results show that the radius of a cylindrical perforated tube dissipative muffler meets the criterions. Based on the conclusion, through installing the rotatable circumferential separate plates, an actuator of the tuned frequency muffler is designed to realize automatic adjustment of the radius, which is available for two kinds of working conditions of acoustic attenuation and can both attain the optimal acoustic attenuation performance. Utilizing the finite element analysis and the experiment test, variation rules of transmission loss versus the muffler’s radius is further investigated. The results show that the variable-radius method used in the tuned frequency muffler can shift the frequency band of acoustic attenuation and optimize the acoustic attenuation performance, which expands the application fields of mufflers and has a great engineering value.

scholarly journals Muffler structure improvement based on acoustic finite element analysis

2019 ◽  
Vol 38 (2) ◽  
pp. 415-426 ◽  
Author(s):  
Jun Fu ◽  
Minghui Xu ◽  
Zengfeng Zhang ◽  
Wenjie Kang ◽  
Yong He
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Transmission Loss ◽  
Low Frequency ◽  
Analysis Method ◽  
Acoustic Attenuation ◽  
Element Analysis ◽  
Acoustic Performance ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis

Aiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite element analysis method and acoustic theory were adopted to numerically investigate the acoustic attenuation performance under the boundary condition of acoustic adiabatic propagation and muffler wall. It suggested that the noise cancellation effect of muffler was poor at the middle and low frequency in range of 0–3000 Hz, and the transfer loss of muffler was basically 0 dB pass frequency at 1100 Hz. According to previous single-factor study experience, the structural factors, such as the expansion ratio, insertion length of outlet perforated pipe, the distance between the diaphragm and the front part of muffler, have influences on the acoustic performance of muffler at low frequency. Thus, they were taken as the starting point to study the influence of multiple interaction factors on the muffling performance by using orthogonal design method combined with the finite element analysis method. The influence degree of different structure parameters on the acoustic performance of muffler and the optimized structure parameters were obtained. Through the analysis on the acoustic characteristic of the optimized muffler, it indicated that the transmission loss of the improved muffler had significant increase in other frequency range except the range of 650–800 Hz and 2500–2700 Hz, especially at frequency of 1100 Hz compared with the original muffler. In the range of 0–3000 Hz, the mean of transmission loss of the improved muffler was about 9.8 dB larger than that of original muffler, which indicated that better noise cancellation effect was achieved. The improved muffler also provided a certain reference for the structural improvement of similar muffler.

The Structure and Properties Research for Sealing Capsule

2014 ◽  
Vol 1065-1069 ◽  
pp. 1296-1299
Author(s):  
Yong Huan Luo ◽  
Zheng Lin Feng ◽  
Jun Liu ◽  
Hong Feng Guo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hong Kong ◽  
Working Conditions ◽  
Basic Structure ◽  
Structure And Properties ◽  
Correlation Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Pile Cap

This paper, A research for the sealing capsule which used in the construction of the underwater cap of Hong Kong-Zhuhai-Macao Bridge. Through the introduction of precast pile cap construction, combined with the sealing of the capsule works, and the basic structure of the sealing of the capsule with installation design. We establish correlation model, combined with the actual working conditions, the application of the finite element analysis of the sealing capsules water sealing characteristics simulation. It shows that the sealing capsule can well meet the actual needs of the Hong Kong-Zhuhai-Macao Bridge underwater cap construction.

scholarly journals Material selection and design analysis of multi-purpose disposable safety syringe

2018 ◽  
Vol 7 (4.13) ◽  
pp. 214-220
Author(s):  
Mohd Nasri Ishak ◽  
Abd Rahim Abu Talib ◽  
Mohammad Yazdi Harmin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Selection ◽  
Selection Process ◽  
Design Analysis ◽  
Element Analysis ◽  
Safety Feature ◽  
The Finite Element Analysis ◽  
Current Design ◽  
Selection For

Current design of safety syringes requires two handed operation and additional processes which is not similar to the normal syringes. Due to this concern, a new design of safety syringe is introduced in order to produce a safety syringe which allows a single-handed operation and similar to the operation of a normal syringes. This paper presents the material selection process and design analysis of a newly devel-oped multi-purpose disposable safety syringe. Based on the design analysis, the force which needed to dismantle the nozzle is found to be 20 N and this value is practical for the end users. The finite element analysis had also shown that the design concept is safe and has safety feature for the user to use. In addition, copolymer is proven as the best material selection for safety syringe production.

The Equal Bending Strength Design of Space Curve Meshing Wheel

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Yang-zhi Chen ◽  
Shun-ke Liang ◽  
Jiang Ding
Keyword(s):  
Finite Element Analysis ◽  
Cross Section ◽  
Mechanical Model ◽  
Bending Strength ◽  
Power Transmission ◽  
Space Curve ◽  
Element Analysis ◽  
Small Power ◽  
Theoretical Design ◽  
The Finite Element Analysis

The space curve meshing wheel (SCMW) has been studied previously for small power transmission. To extend its application in conventional power transmission, the bending strength of the SCMW needs to be studied. In this paper, the tine's section of the SCMW is optimized, the mechanical model of the bending strength is deduced according to the equations for a couple of given contact curves of the SCMW, and the design formulas of the tines are newly deduced based on the equal bending strength principle. Finally, one design example of a SCMW with elliptical torus cross-section tines is provided. The result shows that the theoretical design attained from the presented formulas coincides with that from the finite element analysis. It dedicates that the SCMW possesses enough equal bending strength to be used to in conventional industrial gearing device design.

Structural Analysis and Improvement of Large-Scale Forklift's Wheel Rim

2013 ◽  
Vol 712-715 ◽  
pp. 1080-1083
Author(s):  
Hu Qi Wang ◽  
Hai Zhao He ◽  
Hai Yan Lu ◽  
Rong Xing Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Large Scale ◽  
Element Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Wheel Rim ◽  
Weak Part ◽  
The Finite Element Analysis

A large-scale forklift's wheel rim appeared cracking phenomenon in the course of use. This article summarized and analyzed force of the forklift's wheel rim according to the typical working conditions of forklift, and calculated the load of various working conditions. It provided the correct boundary conditions for the finite element analysis of the wheel rim [. After the analysis of wheel rim's three typical conditions, found the weak parts of the structure of the rim, and this part was consistent with the feedback part, so it proved correct of the finite element analysis model. Clever was used ribbed-plate and punching groove to strengthen the weak part of wheel rim and the finite element model was used to calculate and check the improved wheel rim again. The results showed that the improved wheel rim stress decreased quite, so the measure was correct.

Design of the Metal Gasket of Subsea Connector for Manifolds

2012 ◽  
Vol 184-185 ◽  
pp. 140-145
Author(s):  
Jin Long Wang ◽  
Meng Lan Duan ◽  
Yan Hui Dong ◽  
Hong Guo ◽  
Bo Li ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Simple Structure ◽  
Water Environment ◽  
Engineering Application ◽  
Seal Ring ◽  
Element Analysis ◽  
Inner Pressure ◽  
The Finite Element Analysis

The subsea connector for manifolds is working in bad conditions. The water environment is harsh. And the inner pressure of the jumper which is connected by the subsea connector is high. In this paper, a new design of metal gasket for the connector is proposed. The metal gasket develops a surface contact with the upper and lower hubs. Under the effect of internal pressure, the seal ring will expand outward to ensure good seal performance. The design has a simple structure, and is easy to manufacture and disassemble .This paper uses the finite element analysis to investigate the gasket’s performance in different working conditions, and provides reference for real tests and the engineering application.

Finite Element Analysis and Optimization of Spreading System of Rapid Prototyping Machine for Ceramic Parts Based on ANSYS

2011 ◽  
Vol 284-286 ◽  
pp. 1974-1980
Author(s):  
Dong Qiang Gao ◽  
Fei Zhang ◽  
Zhi Gang Guo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rapid Prototyping ◽  
Working Conditions ◽  
Structural Strength ◽  
Element Analysis ◽  
Structure Deformation ◽  
The Finite Element Analysis

3D modle of spreading platform of rapid prototyping machine for ceramic parts is established in PRO/E, and the modle is input to ANSYS, and the finite element analysis modle of the spreading platform is established by plane elemet; According to the structural strength of the experimental condition, considering the gravity of spreading platform to get the splatform’s stress annlysis and structure deformation in the different working conditions. And the dagenrous section is identitied to provide evidence for the further research, and aslo to provide a reference for other similar products.

Tread Depth Effects on Tire Rolling Resistance

2001 ◽  
Vol 29 (3) ◽  
pp. 134-154 ◽  
Author(s):  
J. R. Luchini ◽  
M. M. Motil ◽  
W. V. Mars
Keyword(s):  
Finite Element Analysis ◽  
Common Knowledge ◽  
Rolling Resistance ◽  
Test Method ◽  
Tire Model ◽  
Element Analysis ◽  
Truck Tires ◽  
The Finite Element Analysis ◽  
Equilibrium Test ◽  
Depth Effects

Abstract This paper discusses the measurement and modeling of tire rolling resistance for a group of radial medium truck tires. The tires were subjected to tread depth modifications by “buffing” the tread surface. The experimental work used the equilibrium test method of SAE J-1269. The finite element analysis (FEA) tire model for tire rolling resistance has been previously presented. The results of the testing showed changes in rolling resistance as a function of tread depth that were inconsistent between tires. Several observations were also inconsistent with published information and common knowledge. Several mechanisms were proposed to explain the results. Additional experiments and models were used to evaluate the mechanisms. Mechanisms that were examined included tire age, surface texture, and tire shape. An explanation based on buffed tread radius, and the resulting changes in footprint stresses, is proposed that explains the observed experimental changes in rolling resistance with tread depth.

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