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Design approach for single piston hydraulic free piston diesel engines

Wei WU, Shihua YUAN, Jibin HU, Chongbo JING,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4,   Pages 371-378 doi: 10.1007/s11465-009-0069-y

Abstract: The operating characteristics of a single piston hydraulic free piston diesel engine differ significantly

Keywords： free piston engine (FPE)     diesel engine     hydraulic equipment     simulation     experiment    

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An experimental study of a single-piston free piston linear generator

Jin XIAO, Yingdong CHENG, Jinlong WANG, Chengwei ZHU, Zhen HUANG

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 916-930 doi: 10.1007/s11708-022-0838-4

Abstract: Free piston linear generator (FPLG) is a promising range extender for the electrical vehicle with unparallelHowever, due to the lack of the mechanic crankshaft, the related piston motion control is a challengeAimed at resolving the problems as misfire, a single-piston FPLG prototype has been designed and manufactured

Keywords： free piston linear generator (FPLG)     charged scavenging     engine control     misfire     stable operation    

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Integrated slipper retainer mechanism to eliminate slipper wear in high-speed axial piston pumps

Frontiers of Mechanical Engineering doi: 10.1007/s11465-021-0657-z

Abstract: The power density of axial piston pumps can greatly benefit from increasing the speed level.However, traditional slippers in axial piston pumps are exposed to continuous sliding on the swash plateTherefore, this paper presents a new integrated slipper retainer mechanism for high-speed axial piston

Keywords： axial piston pump     high speed     slipper wear     slipper design     retainer     lubrication model    

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Design and modeling of a free-piston engine generator

Frontiers in Energy   Pages 811-821 doi: 10.1007/s11708-022-0848-2

Abstract: Free-piston engine generators (FPEGs) can be applied as decarbonized range extenders for electric vehicles

Keywords： free-piston engine generator     linear permanent magnet synchronous machine     system design     numerical model    

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Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-021-0671-1

Abstract: The axial piston pumps in aerospace applications are often characterized by high-speed rotation to achieveThe churning losses deserve much attention at the design stage of high-speed axial piston pumps, butanalytical model provides practical guidelines for reducing the churning losses in high-speed axial piston

Keywords： axial piston pump     rotating parts     high rotational speed     churning losses     drag torque    

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Fault diagnosis of axial piston pumps with multi-sensor data and convolutional neural network

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0692-4

Abstract: Axial piston pumps have wide applications in hydraulic systems for power transmission.Vibration and discharge pressure signals are two common signals used for the fault diagnosis of axial pistonThis paper presents an end-to-end multi-sensor data fusion method for the fault diagnosis of axial pistonExperiments were performed on an axial piston pump to confirm the effectiveness of the proposed methodshow that the proposed multi-sensor data fusion method greatly improves the fault diagnosis of axial piston

Keywords： axial piston pump     fault diagnosis     convolutional neural network     multi-sensor data fusion    

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Fast scaling approach based on cavitation conditions to estimate the speed limitation for axial piston

Qun CHAO, Jianfeng TAO, Junbo LEI, Xiaoliang WEI, Chengliang LIU, Yuanhang WANG, Linghui MENG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1,   Pages 176-185 doi: 10.1007/s11465-020-0616-0

Abstract: The power density of axial piston pumps can benefit greatly from increased rotational speeds.However, the maximum rotational speed of axial piston machines is limited by the cavitation phenomenonfrom an analytical cavitation model to estimate the speed limitations for the same series of axial pistonThe cavitation model is experimentally verified using a high-speed axial piston pump, and the scalingThis constant can represent the comprehensive capacity of axial piston pumps free from cavitation.

Keywords： axial piston pump     cavitation     speed limitation     scaling law    

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A space power system of free piston Stirling generator based on potassium heat pipe

Mingqiang LIN, Jian MOU, Chunyun CHI, Guotong HONG, Panhe GE, Gu HU

Frontiers in Energy 2020, Volume 14, Issue 1,   Pages 1-10 doi: 10.1007/s11708-019-0655-6

Abstract: The power system of a free piston Stirling generator (FPSG) based on potassium heat pipes has been developed

Keywords： free piston Stirling generator (FPSG)     potassium heat pipe     power system     energy conversion    

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Performance of rolling piston type rotary compressor using fullerenes (C70) and NiFe

Ruixiang WANG,Yihao ZHANG,Yi LIAO

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 644-648 doi: 10.1007/s11708-017-0453-y

Abstract: A novel way for a compressor to improve its coefficient of performance was proposed in this paper. Fullerenes (C70) and NiFe O nanocomposites were modified by span 80 and dispersed in refrigeration oil by solid grinding (SG). Besides, the tribological properties of the nanocomposites were investigated using a four ball friction tester. The results show that when the mass concentration of fullerenes nanocomposite is higher than 60 ppm and the concentration of nano-oil is 2 g/L, the friction coefficient decreases from 0.13 to 0.06 which means the wear is reduced. The coefficient of performance of the compressor under the air conditioning test condition can be raised by 1.23%.

Keywords： rotary compressor     friction coefficient     nanocomposite materials     coefficient of performance     fullerenes (C70)    

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Modeling of a Piston Driven, Pressure Swing Reactor

Hu Ming,Zhou Xinggui,Gu Zheng,Yuan Weikang

Strategic Study of CAE 2001, Volume 3, Issue 12,   Pages 52-57

Abstract:

A model for piston driven, rapid pressure swing reactor is developed.By using dynamic simulation software gPROMS, the influences of bed length, cycle length, piston moving

Keywords： piston driven pressure swing reactor     pressure swing     multifunctional reactor     dynamic simulation    

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Research and Applications of Piston Wind VelocityModel for Mine Hoisting System

Wang Conglu,Wu Chao,Wang Weijun,Wu Aiyou

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 182-186

Abstract: Piston wind velocity engendered by hoisting system is one of the primary factors.equation and continuity equation of non-steady flow, the paper presents the calculation formula of pistonAccording to the formula, piston wind velocity can be quantitatively calculate, which will be used as

Keywords： non-invariableness flow     Bernoulli equation     hoisting system     piston wind velocity     mineventilation stability    

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The analysis of the motions of the double eccentric cams used in a process intensification equipment

Zhu Ruilin,Zhu Guolin

Strategic Study of CAE 2012, Volume 14, Issue 10,   Pages 90-96

Abstract: moves in simple harmonic motion (sine/cosine motion), under certain conditions, the components (such as piston

Keywords： cam     piston     simple harmonic motion    

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Multi-objective optimization of surface texture for the slipperswash plate interface in EHA pumps

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0704-4

Abstract: Well-designed surface textures can improve the tribological properties and the efficiency of the electro-hydrostatic actuator (EHA) pump under high-speed and high-pressure conditions. This study proposes a multi-objective optimization model to obtain the arbitrarily surface textures design of the slipper/swash plate interface for improving the mechanical and volumetric efficiency of the EHA pump. The model is composed of the lubrication film model, the component dynamic model considering the spinning motion, and the multi-objective optimization model. In this way, the arbitrary-shaped surface texture with the best comprehensive effect in the EHA pump is achieved and its positive effects in the EHA pump prototype are verified. Experimental results show a reduction in wear and an improvement in mechanical and volumetric efficiency by 1.4% and 0.8%, respectively, with the textured swash plate compared with the untextured one.

Keywords： electro-hydrostatic actuator     axial piston pump     slipper/swash plate interface     multi-objective optimization    

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Research on non-mechanical ventilation effect in Zhongnanshan road tunne

Zheng Xuan,Guo Jiaqi

Strategic Study of CAE 2010, Volume 12, Issue 3,   Pages 39-44

Abstract:

Zhongnanshan extra-long road tunnel in Qingling is large-scale and has a complex ventilation system. In order to guarantee the ventilation scheme properly and save the ventilation expenditure, the evaluation of non-mechanical ventilation effect is of importance. The research team monitored the natural wind initially, traffic flux and the wind induced by natural ventilation pressure and traffic wind force subsequently, and obtained lots of data. Through analysis of the monitoring data, we draw some conclusions: firstly, bigger speed of the natural wind occurs in the period from 10∶00 am to 14∶00 pm, and the greatest value reaches 2.576 m / s; secondly, the period of peak traffic flux in tunnel(east or west line) is mostly constant; at last, the period of bigger wind speed, which induced by natural ventilation pressure and traffic wind force, basically matches the period of peak traffic flux in the east line, while the two periods match badly in west line, meantime, the change of wind speed is relatively smooth in west line. The calculating value of the natural wind speed by method which takes account of some parameters such as wind orientation, frequency of wind orientation, the temperature of portal et al, approximates the monitoring value. The calculating value of the wind speed induced by natural ventilation pressure and traffic wind force is a little smaller than the monitoring, but approximate it.

Keywords： tunnel ventilation     field monitoring     non-mechanical ventilation     natural wind     traffic piston wind    

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Control of peak pressures of an HCCI engine under varying swirl and operating parameters

T. KARTHIKEYA SHARMA,G. AMBA PRASAD RAO,K. MADHU MURTHY

Frontiers in Energy 2016, Volume 10, Issue 3,   Pages 337-346 doi: 10.1007/s11708-016-0401-2

Abstract: A single cylinder 1.6 L reentrant piston bowl diesel engine is chosen.Numerical experiments are performed to study the effect of varying properties like speed of the engine, pistonThe combined effect of four operating parameters, i.e., the speed of the engine, piston bowl geometry, EGR, and equivalence ratio with swirl ratios suggest that lower intake temperatures, reentrant piston

Keywords： HCCI engine     ECFM-3Z     Swirl ratio     peak pressures     engine speed     piston bowl geometry    

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Title Author Date Type Operation

Design approach for single piston hydraulic free piston diesel engines

Wei WU, Shihua YUAN, Jibin HU, Chongbo JING,

Journal Article

An experimental study of a single-piston free piston linear generator

Jin XIAO, Yingdong CHENG, Jinlong WANG, Chengwei ZHU, Zhen HUANG

Journal Article

Integrated slipper retainer mechanism to eliminate slipper wear in high-speed axial piston pumps

Journal Article

Design and modeling of a free-piston engine generator

Journal Article

Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Journal Article

Fault diagnosis of axial piston pumps with multi-sensor data and convolutional neural network

Journal Article

Fast scaling approach based on cavitation conditions to estimate the speed limitation for axial piston

Qun CHAO, Jianfeng TAO, Junbo LEI, Xiaoliang WEI, Chengliang LIU, Yuanhang WANG, Linghui MENG

Journal Article

A space power system of free piston Stirling generator based on potassium heat pipe

Mingqiang LIN, Jian MOU, Chunyun CHI, Guotong HONG, Panhe GE, Gu HU

Journal Article

Performance of rolling piston type rotary compressor using fullerenes (C70) and NiFe

Ruixiang WANG,Yihao ZHANG,Yi LIAO

Journal Article

Modeling of a Piston Driven, Pressure Swing Reactor

Hu Ming,Zhou Xinggui,Gu Zheng,Yuan Weikang

Journal Article

Research and Applications of Piston Wind VelocityModel for Mine Hoisting System

Wang Conglu,Wu Chao,Wang Weijun,Wu Aiyou

Journal Article

The analysis of the motions of the double eccentric cams used in a process intensification equipment

Zhu Ruilin,Zhu Guolin

Journal Article

Multi-objective optimization of surface texture for the slipperswash plate interface in EHA pumps

Journal Article

Research on non-mechanical ventilation effect in Zhongnanshan road tunne

Zheng Xuan,Guo Jiaqi

Journal Article

Control of peak pressures of an HCCI engine under varying swirl and operating parameters

T. KARTHIKEYA SHARMA,G. AMBA PRASAD RAO,K. MADHU MURTHY

Journal Article