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Research on Measurement Method of Aerodynamic Noise of Reactive Muffler

Wuhan University of Technology-Liping Xie, Zhien Liu, Zhu Yawei, Kai Liu, Chenhui Ye
  • Technical Paper
  • 2020-01-0423
To be published on 2020-04-14 by SAE International in United States
The aerodynamic noise of the reactive muffler is generated inside the muffler and mixed with the noise of the muffler body, which is difficult to be measured in the exhaust system. Based on two-microphone transfer function method and transmission loss of mufflers in the absence of airflow, this paper proposes a method for measuring the aerodynamic noise of the muffler. On the built-in muffler aerodynamic noise test bench, a special sampling tube was designed to measure the aerodynamic noise of the muffler at different flow velocity. For the sound absorption end with large reflection coefficient, the test and simulation data have large error at low frequency, and a correction formula that can eliminate the reflection of sound waves at the end of the test pipeline and form multiple reflections in the upstream and downstream is derived. The test results of the muffler on the test bench show: The aerodynamic noise data obtained by the sampling pipe is basically consistent with the simulation results by means of leading out measurement, which realizes the measurement of high…
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Optimal Design of Cellular Material Systems for Crashworthiness

Honda R & D Americas Inc.-Duane Detwiler
Indiana University Purdue University-ZongYing Xu, Andres Tovar
Published 2016-04-05 by SAE International in United States
This work proposes a new method to design crashworthiness structures that made of functionally graded cellular (porous) material. The proposed method consists of three stages: The first stage is to generate a conceptual design using a topology optimization algorithm so that a variable density is distributed within the structure minimizing its compliance. The second stage is to cluster the variable density using a machine-learning algorithm to reduce the dimension of the design space. The third stage is to maximize structural crashworthiness indicators (e.g., internal energy absorption) and minimize mass using a metamodel-based multi-objective genetic algorithm. The final structure is synthesized by optimally selecting cellular material phases from a predefined material library. In this work, the Hashin-Shtrikman bounds are derived for the two-phase cellular material, and the structure performances are compared to the optimized structures derived by our proposed framework. In comparison to traditional structures that made of a single cellular phase, the results demonstrate the improved performance when multiple cellular phases are used.
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Thin-Walled Compliant Mechanism Component Design Assisted by Machine Learning and Multiple Surrogates

Honda R & D Americas Inc-Emily Nutwell, Duane Detwiler
Indiana Univ Purdue Univ-Andres Tovar
Published 2015-04-14 by SAE International in United States
This work introduces a new design algorithm to optimize progressively folding thin-walled structures and in order to improve automotive crashworthiness. The proposed design algorithm is composed of three stages: conceptual thickness distribution, design parameterization, and multi-objective design optimization. The conceptual thickness distribution stage generates an innovative design using a novel one-iteration compliant mechanism approach that triggers progressive folding even on irregular structures under oblique impact. The design parameterization stage optimally segments the conceptual design into a reduced number of clusters using a machine learning K-means algorithm. Finally, the multi-objective design optimization stage finds non-dominated designs of maximum specific energy absorption and minimum peak crushing force. The proposed optimization problem is addressed by a multi-objective genetic algorithm on sequentially updated surrogate models, which are optimally selected from a set of 24 surrogates. The effectiveness of the design algorithm is demonstrated on an S-rail thin-walled structure. The best compromised Pareto design increases specific energy absorption and decreases peak crushing force in the order of 8% and 12%, respectively.
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Pitch Line Design for Noncircular Chain Drive

Faculty of Science and Technology, Kinki University-Eiichi Bamba
Xian University of Technology-Kai Liu
Published 2001-03-05 by SAE International in United States
In the design of noncircular chain drive, the key problem is to design pitch line of noncircular chain wheel. This paper deals with the design principle for pitch line of noncircular chain drive according to the principle of envelope as well as the calculation method of pitch line with the detailed calculation equation given eventually on the basis of taking the noncircular chain drive as a function generator.
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Dynamic Analysis of an Overrunning Clutch for the Pulse-Continuously-Variable-Speed Transmission

Kinki University-Eiichi Bamba
Xi'an University of Technology-Kai Liu, Haiyan Zhang
Published 1998-02-23 by SAE International in United States
A roller type overrunning clutch is often used for the pulse-continuously-variable-speed transmission (pulse-CVT). This paper investigates the time-dependent characteristics of this clutch. The operation of the overrunning clutch for the pulse-CVT includes a working process, an acceleration process, and a locking process. The characteristics of the dynamic load in these processes were analyzed and closed-form equations were obtained for the load as a function of time. For the first time, a theoretical solution for the slip angle, which was usually determined by experimental measurements, was formulated based on an impact analysis.
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