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Research on Measurement Method of Muffler Performance under High Temperature and High-Speed Airflow Conditions

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Journal of Beijing Institute of Technology 2020年第2期29卷 241-250页

作者： Liping Xie Chihua Lu Zhien Liu Yawei Zhu Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Ignoring the influence of flow velocity and flow temperature on muffling performance,performance tests were conducted without airflow in the development phase of the muffler which accounts to the difficulty of obtaining a perfect match between the actual noise reduction effect and the design *** on the two-load test theory,a set of high-temperature and high-speed airflow simulation measurement devices for the muffler has been *** order to avoid the impact of high-temperature and high-speed airflow on the sensor,a high temperature resistant sensor holder has been designed for the test *** sound pressure has been measured in the pipe by using the lead-out *** addition,a variable impedance load is placed at the end of the test tube to realize the switch between two different impedance loads by the wave handle of the variable impedance load.A sound source correction method is proposed to decrease the random fluctuation of the spectral characteristics of the output noise signal,which is caused by the acoustic impedance variation at the connection between the transition pipeline and the combined sound source ***,an acoustic software has been used to calculate the transmission loss of the muffler in the presence of high temperature *** comparing the experimental measurements and the simulation results,the small difference shows that:the bench not only can effectively simulate high-temperature and flow velocity environment of the engine but also accurately test the transmission loss of the muffler.

关键词： muffler lead-out measurement variable load source correction transmission loss

Research on gas leakage through suction valves of reciprocating compressor under varying load conditions

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High Technology Letters 2021年第3期27卷 262-271页

作者： Zhang Jinjie Wang Yao Zhang Chun Jiang Zhinong Sun Xu Beijing Key Laboratory of Health Monitoring Control and Fault Self-Recovery for High-End Machinery Beijing University of Chemical TechnologyBeijing 100029P.R.China Compressor Health and Intelligent Monitoring Center of National Key Laboratory of Compressor Technology Beijing University of Chemical TechnologyBeijing 100029P.R.China

A research concerning the coupling conditions of gas leakage through suction valves and capacity regulation is performed in an industrial reciprocating *** internal flow and thermodynamic characteristic are discussed in *** results show that the capacity of compressor can be regulated steplessly by controlling suction valve closure *** then the quantitative relationship between the capacity load and the closing angle of suction valve is *** capacity load and valve leakage rate show obvious different features in P-V diagrams,which makes it easier to define appropriate features for detecting cracked or broken reciprocating compressor valves under varying load conditions.A set of curves of compression work and discharge gas mass are obtained and a method for rating thermal performance of a compressor is presented using these curves.

关键词： reciprocating compressor computational fluid dynamics(CFD) variable load suction valve leakage thermal performance

An analytical model for predicting battery lifetime

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Journal of Measurement Science and Instrumentation 2013年第1期4卷 19-22页

作者： Guang Yang Sangho Kim Seongsoo Lee SoC Laboratory Soongsil UniversitySeoul 156-743Korea

We used an analytical high-level battery model to estimate the battery lifetime for a given *** experimental results show that this model to predict battery lifetime under variable loads is more appropriate than that ... 详细信息

关键词： battery modeling battery lifetime prediction constant load variable load

Design and application of a multi - function combined hydraulic oil cylinder

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International Journal of Technology Management 2016年第9期 56-57页

作者： Liangyuan Shen Teaching and research department High-tech institute Fan Gong-ting south street T on the 12^th Qing Zhou China

Hydraulic equipment in engineering, in different working stages, different speed, load, variable load and variable speed is one of the most frequently encountered problems, to solve this problem is usually used to continuously adjustable pressure, adjustable flow control to achieve. In this paper, the structure design of a combination of oil tanks, combined with oil circuit examples in the case of no need to adjust the pressure, adjust the flow rate, to achieve the high speed, light load of the typical operating requirements and hydraulic servo feedback.

关键词： variable load variable speed structure design application

Lateral Overturning Dynamic Simulation and Analysis of Single Column Pier Girder Bridge

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Lateral Overturning Dynamic Simulation and Analysis of Singl...