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< Page ,Total 43 >
A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds EI SCIE
期刊论文 | 2019 , 132 , 1-10 | International Journal of Heat and Mass Transfer
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Abstract :

The effective thermal conductivity (ETC) of metal powder is a basic physical property that has an important role in industrial design for metallurgical, energy, chemical, and other types of application. To obtain this information, a numerical model based on the coupled discrete element-finite difference (DE-FD) method is proposed to precisely and efficiently predict the ETC of metal powders. A random packaged aluminum powder unit influenced by the effects of gravity is piled up concerning the particle size distribution of the real powder. Moreover, a sandwich structure model is proposed to simulate the thermal dynamic behavior during directional heat transfer. Based on the amount of heat passing through the system, the effective thermal conductivity was precisely calculated in an indirect way and the results of the simulation were consistent with corresponding experimental results. Relative error was within ±5%. Thus, the proposed numerical model may be useful in predicting the ETC of the different powder beds filed using various types of interstitial gas media within a wide range of temperatures. © 2018 Elsevier Ltd

Keyword :

Aluminum powders Coupling modeling Effective thermal conductivity Powder bed Relative errors Thermal dynamics

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GB/T 7714 Zhang, Hang , Zhao, Yizhen , Wang, Fu et al. A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds [J]. | International Journal of Heat and Mass Transfer , 2019 , 132 : 1-10 .
MLA Zhang, Hang et al. "A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds" . | International Journal of Heat and Mass Transfer 132 (2019) : 1-10 .
APA Zhang, Hang , Zhao, Yizhen , Wang, Fu , Li, Dichen . A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds . | International Journal of Heat and Mass Transfer , 2019 , 132 , 1-10 .
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A Manganin Thin Film Ultra-High Pressure Sensor for Microscale Detonation Pressure Measurement EI SCIE PubMed Scopus
期刊论文 | 2018 , 18 (3) | SENSORS
SCOPUS Cited Count: 1
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Abstract :

With the development of energetic materials (EMs) and microelectromechanical systems (MEMS) initiating explosive devices, the measurement of detonation pressure generated by EMs in the microscale has become a pressing need. This paper develops a manganin thin film ultra-high pressure sensor based on MEMS technology for measuring the output pressure from micro-detonator. A reliable coefficient is proposed for designing the sensor's sensitive element better. The sensor employs sandwich structure: the substrate uses a 0.5 mm thick alumina ceramic, the manganin sensitive element with a size of 0.2 mm x 0.1 mm x 2 mu m and copper electrodes of 2 mu m thick are sputtered sequentially on the substrate, and a 25 mu m thick insulating layer of polyimide is wrapped on the sensitive element. The static test shows that the piezoresistive coefficient of manganin thin film is 0.0125 GPa(-1). The dynamic experiment indicates that the detonation pressure of micro-detonator is 12.66 GPa, and the response time of the sensor is 37 ns. In a word, the sensor developed in this study is suitable for measuring ultra-high pressure in microscale and has a shorter response time than that of foil-like manganin gauges. Simultaneously, this study could be beneficial to research on ultra-high-pressure sensors with smaller size.

Keyword :

detonation pressure manganin thin film MEMS technology microscale measurement ultra-high pressure sensor

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GB/T 7714 Zhang, Guodong , Zhao, Yulong , Zhao, Yun et al. A Manganin Thin Film Ultra-High Pressure Sensor for Microscale Detonation Pressure Measurement [J]. | SENSORS , 2018 , 18 (3) .
MLA Zhang, Guodong et al. "A Manganin Thin Film Ultra-High Pressure Sensor for Microscale Detonation Pressure Measurement" . | SENSORS 18 . 3 (2018) .
APA Zhang, Guodong , Zhao, Yulong , Zhao, Yun , Wang, Xinchen , Wei, Xueyong , Ren, Wei et al. A Manganin Thin Film Ultra-High Pressure Sensor for Microscale Detonation Pressure Measurement . | SENSORS , 2018 , 18 (3) .
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A MEMS SOI-based piezoresistive fluid flow sensor EI SCIE PubMed Scopus
期刊论文 | 2018 , 89 (2) | REVIEW OF SCIENTIFIC INSTRUMENTS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In this paper, a SOI (silicon-on-insulator)-based piezoresistive fluid flow sensor is presented; the presented flow sensor mainly consists of a nylon sensing head, stainless steel cantilever beam, SOI sensor chip, printed circuit board, half-cylinder gasket, and stainless steel shell. The working principle of the sensor and some detailed contrastive analysis about the sensor structure were introduced since the nylon sensing head and stainless steel cantilever beam have distinct influence on the sensor performance; the structure of nylon sensing head and stainless steel cantilever beam is also discussed. The SOI sensor chip was fabricated using micro-electromechanical systems technologies, such as reactive ion etching and low pressure chemical vapor deposition. The designed fluid sensor was packaged and tested; a calibration installation system was purposely designed for the sensor experiment. The testing results indicated that the output voltage of the sensor is proportional to the square of the fluid flow velocity, which is coincident with the theoretical derivation. The tested sensitivity of the sensor is 3.91 x 10(-4) V ms(2)/kg. Published by AIP Publishing.

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GB/T 7714 Tian, B. , Li, H. F. , Yang, H. et al. A MEMS SOI-based piezoresistive fluid flow sensor [J]. | REVIEW OF SCIENTIFIC INSTRUMENTS , 2018 , 89 (2) .
MLA Tian, B. et al. "A MEMS SOI-based piezoresistive fluid flow sensor" . | REVIEW OF SCIENTIFIC INSTRUMENTS 89 . 2 (2018) .
APA Tian, B. , Li, H. F. , Yang, H. , Song, D. L. , Bai, X. W. , Zhao, Y. L. . A MEMS SOI-based piezoresistive fluid flow sensor . | REVIEW OF SCIENTIFIC INSTRUMENTS , 2018 , 89 (2) .
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DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING EI CPCI-S Scopus
会议论文 | 2018 | ASME International Mechanical Engineering Congress and Exposition
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Abstract :

Strong shear force developed in the fluid film as the water lubricated hybrid bearing operates at high speeds. Thus the phenomena of shaft expanding outward and bearing contracting inward happened due to the increasing temperature of the fluid film caused by the friction heat. So the bearing clearance decreases on account of the thermal deformation of the shaft and the bearing. Seriously, there will be a risk of seizure accident when the speed gets higher. Friction heat may be weakened by adopting low viscosity lubricant and thermal deformation may be reduced by adopting low expansion coefficient materials. Such as the ceramic's expansion coefficient is 3-5 times smaller than that of typical journal bearing material like tin bronze. Thus, a ceramic journal bearing was developed in this paper to weaken the thermal influence on the bearing clearance. For improving the temperature rise of the journal bearing, a water-lubricated ceramic hydrodynamic hydrostatic hybrid bearing test rig was designed firstly. Considering expansion coefficient and thermal conductivity effects, the simulation method was used to study the variation of bearing clearance with the speed and the original bearing clearance. Then, the water-lubricated ceramic hydrodynamic hydrostatic hybrid bearing test rig was developed to verify the temperature characteristics at different speeds. Results indicate that the relative error of the tested temperature results and simulation results was below 10% at different speeds. Lastly, the evolution of bearing clearance with speed and the original bearing clearance was studied through FEM. The advantages of ceramic material were more obvious with the increase of the rotation speed when exceeds 8000rpm.

Keyword :

journal bearing temperature rise ceramic bearing water-lubricated

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GB/T 7714 Zha, Jun , Wang, Jianlei , Liu, Kejia et al. DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING [C] . 2018 .
MLA Zha, Jun et al. "DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING" . (2018) .
APA Zha, Jun , Wang, Jianlei , Liu, Kejia , Chen, Yaolong . DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING . (2018) .
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A MEMS resonant accelerometer for low-frequency vibration detection EI SCIE Scopus
期刊论文 | 2018 , 283 , 151-158 | Sensors and Actuators, A: Physical
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Abstract :

According to their inherent characteristics, MEMS resonant accelerometers are suitable for low-frequency, low-g acceleration measurement. In this paper, we report a MEMS accelerometer based on double-ended-tuning fork resonators. The scale factor of our sensor is 1153.3 Hz/g and the bias stability of the oscillator is 58 ppb (parts per billion) for an averaging time of 1 s. The static test showed that the resolution of our sensor was 13.8 μg. The dynamic performance was demonstrated by single-frequency and hybrid-frequency vibration tests, and the results showed that our device is suitable for detecting low-frequency vibration (0.5–5 Hz). The cross-axis sensitivity is 1.33%. Compared with a standard charge accelerometer, our device showed its superiority in mixed acceleration measurement, which makes it a potentially attractive option for geophone or seismometer applications. © 2018 Elsevier B.V.

Keyword :

Cross-axis sensitivity Double-ended-tuning-fork resonators Dynamic performance Dynamic tests Inherent characteristics Low-frequency Low-frequency vibration MEMS resonant accelerometers

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GB/T 7714 Wang, Shudong , Wei, Xueyong , Zhao, Yulong et al. A MEMS resonant accelerometer for low-frequency vibration detection [J]. | Sensors and Actuators, A: Physical , 2018 , 283 : 151-158 .
MLA Wang, Shudong et al. "A MEMS resonant accelerometer for low-frequency vibration detection" . | Sensors and Actuators, A: Physical 283 (2018) : 151-158 .
APA Wang, Shudong , Wei, Xueyong , Zhao, Yulong , Jiang, Zhuangde , Shen, Yajing . A MEMS resonant accelerometer for low-frequency vibration detection . | Sensors and Actuators, A: Physical , 2018 , 283 , 151-158 .
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Nonsingular terminal sliding mode control for the ESO-based stabilized platform EI Scopus PKU
期刊论文 | 2018 , 39 (5) , 161-169 | Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument
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Abstract:This paper presents a composite control strategy which employs the nonsingular terminal sliding mode (NTSM) control based on extended state observer (ESO). The influence of the multi-source disturbances on the control performance of the inertially stabilized platform (ISP) for aerial mete sensing applications is effectively suppressed. The stability and tracing accuracy of the ISP are also improved. The high-precision remote sensing images are achieved. Firstly, the NTSM control strategy is adopted to restrain the multi-source disturbances, in which the disturbances are taken as a total disturbance. By designing and optimizing the control interface and the control law of the NTSM, the influences of the disturbances on the control performance are effectively decreased. Then, the ESO is used to solve the chattering problem in the sliding mode. By transmitting the observed state and sum of interferences to the NTSM controller, the control law is further optimized and the chattering disturbance is suppressed in real time. Finally, simulation and experimental evaluations are carried out, respectively. The results show that the proposed method can effectively improve the disturbance suppression ability and stability accuracy of the ISP. © 2018, Science Press. All right reserved.

Keyword :

Chattering Disturbance Extended state observer Inertial stabilization platform Non-singular terminal sliding modes

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GB/T 7714 Zhou, Xiangyang , Li, Lingling , Zhao, Libo . Nonsingular terminal sliding mode control for the ESO-based stabilized platform [J]. | Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument , 2018 , 39 (5) : 161-169 .
MLA Zhou, Xiangyang et al. "Nonsingular terminal sliding mode control for the ESO-based stabilized platform" . | Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 39 . 5 (2018) : 161-169 .
APA Zhou, Xiangyang , Li, Lingling , Zhao, Libo . Nonsingular terminal sliding mode control for the ESO-based stabilized platform . | Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument , 2018 , 39 (5) , 161-169 .
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A GA-based parameters tuning method for an ADRC controller of ISP for aerial remote sensing applications. EI SCIE PubMed Scopus
期刊论文 | 2018 , 81 , 318-328 | ISA transactions
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Abstract :

This paper presents a parameters tuning method based on the genetic algorithm (GA) for an active disturbance rejection control (ADRC) of a three-axis inertially stabilized platform (ISP) with imaging sensors. To improve the stabilization accuracy and robustness of an aerial ISP under multi-source disturbances environment, an ADRC control scheme is first proposed. Then, to accurately identify and tune the parameters in the ADRC controller, a GA-based parameters tuning method is proposed. In this way, the performance of the ADRC is superior to the empirical method. To validate the proposed method, the simulations and experiments are carried out. The results show that the proposed ADRC with GA-based parameters tuning method has significant disturbance rejection ability which can improve the stabilization accuracy obviously. Compared with the ADRC with empirically tuning method, the stabilization error (RMS) under movable base is decreased up to 50.09%.

Keyword :

Active disturbance rejection control Disturbance rejection Genetic algorithm Inertially stabilized platform Parameters tuning

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GB/T 7714 Zhou Xiangyang , Gao Hao , Zhao Beilei et al. A GA-based parameters tuning method for an ADRC controller of ISP for aerial remote sensing applications. [J]. | ISA transactions , 2018 , 81 : 318-328 .
MLA Zhou Xiangyang et al. "A GA-based parameters tuning method for an ADRC controller of ISP for aerial remote sensing applications." . | ISA transactions 81 (2018) : 318-328 .
APA Zhou Xiangyang , Gao Hao , Zhao Beilei , Zhao Libo . A GA-based parameters tuning method for an ADRC controller of ISP for aerial remote sensing applications. . | ISA transactions , 2018 , 81 , 318-328 .
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A High-Precision Control Scheme Based on Active Disturbance Rejection Control for a Three-Axis Inertially Stabilized Platform for Aerial Remote Sensing Applications EI SCIE
期刊论文 | 2018 | JOURNAL OF SENSORS
WoS CC Cited Count: 1
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Abstract :

This paper presents a high-precision control scheme based on active disturbance rejection control (ADRC) to improve the stabilization accuracy of an inertially stabilized platform (ISP) for aerial remote sensing applications. The ADRC controller is designed to suppress the effects of the disturbance on the stabilization accuracy that consists of a tracking differentiator, a nonlinear state error feedback, and an extended state observer. By the ADRC controller, the effects of both the internal uncertain dynamics and the external multisource disturbances on the system output are compensated as a total disturbance in real time. The disturbance rejection ability of the ADRC is analyzed by simulations. To verify the method, the experiments are conducted. The results show that compared with the conventional PID controller, the ADRC has excellent capability in disturbance rejection, by which the effect of main friction disturbance on the control system can be weakened seriously and the stabilization accuracy of the ISP is improved significantly.

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GB/T 7714 Zhou, Xiangyang , Yang, Chao , Zhao, Beilei et al. A High-Precision Control Scheme Based on Active Disturbance Rejection Control for a Three-Axis Inertially Stabilized Platform for Aerial Remote Sensing Applications [J]. | JOURNAL OF SENSORS , 2018 .
MLA Zhou, Xiangyang et al. "A High-Precision Control Scheme Based on Active Disturbance Rejection Control for a Three-Axis Inertially Stabilized Platform for Aerial Remote Sensing Applications" . | JOURNAL OF SENSORS (2018) .
APA Zhou, Xiangyang , Yang, Chao , Zhao, Beilei , Zhao, Libo , Zhu, Zhuangsheng . A High-Precision Control Scheme Based on Active Disturbance Rejection Control for a Three-Axis Inertially Stabilized Platform for Aerial Remote Sensing Applications . | JOURNAL OF SENSORS , 2018 .
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Nd∶YAG晶体高精度切割加工试验研究 PKU
期刊论文 | 2017 , (6) , 152-156 | 制造技术与机床
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Abstract :

利用环形电镀金刚石线切割机对Nd∶YAG晶体进行了切割实验研究,分析了水平和旋转切割模式对晶体切割质量的影响,得出旋转切割更适合Nd∶YAG的圆晶片加工,不仅可以提高晶体的加工表面质量,还大幅度减小了切割时间.采用正交法对旋转切割进行试验设计,研究不同切割参数对Nd∶YAG晶体切割质量的影响规律.通过对试验结果进行分析,得出环形金刚石线切割Nd∶YAG晶体的最优工艺参数,切割后的晶片经过工艺处理后可直接进行后续的抛光加工.

Keyword :

金刚石线切割机 YAG晶体 表面质量 旋转切割

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GB/T 7714 冯嫄嫄 , 赵惠英 , 徐世栋 et al. Nd∶YAG晶体高精度切割加工试验研究 [J]. | 制造技术与机床 , 2017 , (6) : 152-156 .
MLA 冯嫄嫄 et al. "Nd∶YAG晶体高精度切割加工试验研究" . | 制造技术与机床 6 (2017) : 152-156 .
APA 冯嫄嫄 , 赵惠英 , 徐世栋 , 班新星 , 刘文涛 , 李彬 . Nd∶YAG晶体高精度切割加工试验研究 . | 制造技术与机床 , 2017 , (6) , 152-156 .
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环形金刚石线锯切割镍钴合金的试验研究
期刊论文 | 2017 , (6) , 33-37 | 中原工学院学报
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Abstract :

基于环形电镀金刚石线锯切割硬脆材料的工艺特点,对张紧力、锯丝速度等切削参数进行分析并确定合理的取值范围.通过环形电镀金刚石线锯切割镍钴合金正交试验,为环形电镀金刚石线锯的工艺参数选择提供了一定依据.在测量切割工件表面粗糙度的基础上,分析了锯丝速度、张紧力和进给速度等参数对切割工件表面粗糙度的影响.结果表明:张紧力对粗糙度影响最大,张紧力越大粗糙度越小,但张紧力增大到一定值后其影响变得很小;表面粗糙度随着锯丝速度的提高而下降,但锯丝速度过高会降低锯丝使用寿命;进给速度越小则表面粗糙度越小,但过低的进给速度会降低切割效率.

Keyword :

表面粗糙度 镍钴合金 线切割 金刚石线锯

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GB/T 7714 刘文涛 , 李彬 , 赵惠英 et al. 环形金刚石线锯切割镍钴合金的试验研究 [J]. | 中原工学院学报 , 2017 , (6) : 33-37 .
MLA 刘文涛 et al. "环形金刚石线锯切割镍钴合金的试验研究" . | 中原工学院学报 6 (2017) : 33-37 .
APA 刘文涛 , 李彬 , 赵惠英 , 冯嫄嫄 , 班新星 , 赵家宁 . 环形金刚石线锯切割镍钴合金的试验研究 . | 中原工学院学报 , 2017 , (6) , 33-37 .
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