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Precision Balance Method for cupped Wave Gyro Based on cup-bottom Trimming

chinese Journal of Mechanical Engineering 2012年第1期25卷 63-70页

作者： TAo Yi XI Xiang XIAo Dingbang TAn Yingqi cUI Hongjuan WU Xuezhong college of Mecha tronics Engineering and Automation National University of Defense TechnologyChangsha 410073China wuhan ordnance n.c.o.academy Wuhan 430075China Department of Mechatronics Engineering Zhuhai CollegeJilin UniversityZhuhai 519041China

The mechanical balance process is the key process to eliminate the quadrature error and improve the performance of the cupped wave gyro. The conventional mechanical balance method for cupped wave gyro based on cup-wall trimming requires high control accuracy of trimming quantity, which increases the production cost and decreases the fabrication efficiency in large extent. However, it is hard to reach the high balance accuracy with the natural frequency split of mHz grade by using the conventional method. In this paper, the lumped mass dynamic model of the cupped wave gyro is built by discretization method, and the effects of different position trimming on the natural frequency are analyzed. It is pointed out that trimming off a tiny quantity of material from cup-wall causes large variation of the natural frequency is the main reason for the low accuracy of the conventional mechanical balance method. Then, a precision balance method for cupped wave gyro based on cup-bottom trimming is presented and the entire procedures of this method are given. The static balance process and dynamic balance process of the precision balance method are simulated by the finite element software. The simulation result shows that the precision balance method based on cup-bottom trimming brings less additional natural frequency split in the static balance process, minimizes the natural frequency split to mHz grade and rectify the angle of mode offset to 0.1° grade in the dynamic balance process, furthermore, the method decreases the requirement for control accuracy of trimming quantity evidently. The research work provides references for structure optimization design and balance process plan of the cupped wave gyro.

关键词： cupped wave gyro precision balance trimming modal analysis natural frequency split

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Mathematical Modeling and Structure optimization of cupped Wave Gyro

Mathematical Modeling and Structure Optimization of Cupped W...

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2012 2nd lnternational conference on Materials Engineering for Advanced Technologies (IcMEAT 2012)

作者： Yi Tao Zhiyong cheng Zhisheng Jing Zelong Zhou chaofa Yu Rongyue Xie wuhan ordnance n.c.o.academy

cupped wave gyro's mathematical modeling is derived via Hamilton principle,and the displacement equations and the nature frequency of gyro is determined by Galerkin *** on the modeling analysis and finite element method,the parameters of structure are *** paper provides a reference in the design and fabrication of cupped wave gyro.

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The Reflexive Solutions of the Matrix Equations (AX,XB^H )= (c,D^H )

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Journal of Donghua University(English Edition) 2012年第4期29卷 311-315页

作者：张敏林卫国刘丁酉 Basic courses Department Wuhan Ordnance N.C.O Academy of PLAWuhan 430075 China college of Engineering Huazhong Agricultural University School of Mathematics and Statistics Wuhan University

The matrix equations (AX, XBH)=(c, DH) have been widely used in structural design, parameter identification, linear optimal control, and so on. But few researches studied the reflexive solutions. A new approach for the reflexive solutions to the matrix equations was proposed. By applying the canonical correlation decomposition (ccD) of matrix pairs, the necessary and sufficient conditions for the existence and the general expression for the reflexive solutions of the matrix equations (AX, XBH)=(c, DH) were established. In addition, by using the methods of space decomposition, the expression of the optimal approximation solution to a given matrix was derived.

关键词： reflexive matrix matrix equations optimal approximation canonical correlation decomposition(ccD)

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Design and characterization of a novel Z-axis Quartz cross-fork Micromachined Gyroscope

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chinese Journal of Mechanical Engineering 2011年第1期24卷 50-57页

作者： XIE Liqiang WU Xuezhong LI Shengyi WAnG Haoxu TAo Yi DonG Peitao college of Mechatronics Engineering andAutomation National University of Defense Technology Changsha 410073 China Engineering Institute of Engineering corps PLA University of Science and Technology Nanjing 210007 China wuhan ordnance n. c. o. academy Wuhan 430075 China

The existing researches on quartz gyroscope mainly focus on the structure design of the tuning fork, which aim at obtaining a better vibration characterization. However, the fabrication of complicated structure is a challenge for present processes, and the imperfect fabrication process seriously affects the performances of the sensors. In this paper, a novel quartz cross-fork structure micromachined gyroscope is proposed. The sensor has a simple structure in x-y plane of quartz crystal. Unlike other quartz gyroscopes, the proposed gyroscope is based on shear stress detection to sense coriolis’ force rather than normal stress detection. This feature can simplify the sensing electrode patterns and miniaturize the structure easily. Then the mechanical analysis of the structure is discussed. In order to obtain high sensitivities and uniform characteristics between different structures, the sensing beam is designed to be tapered, and the taper should be appreciably greater than 1°. This scheme is validated by finite element analysis software. The dynamic characteristic of the structure is analyzed by lumped parameter model. The dynamic stress in the beam and the detection sensitivity are deduced to optimize the structure parameter of gyroscope. Finally, the gyroscope is fabricated by quartz anisotropic wet etching. The prototype is characterized as follows. The drive mode frequency is 13.38 kHz, and the quality factor is about 900 in air. The scale factor is 1.45 mV/（（°） s –1 ） and the nonlinearity is 3.6% in the dynamic range of ±200°/s. Process and test results show that the proposed quartz gyroscope can achieve a high performance at atmosphere pressure. The research can simplify the fabrication of the quartz gyroscope, and is taken as a novel method for the design of quartz gyroscope.

关键词： quartz gyroscope cross-fork dynamic analysis coriolis’ force

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Simulation and experimental research on line throwing rocket with flight

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Defence Technology（防务技术） 2014年第2期10卷 149-153页

作者： Wen-bin GU Ming LU Jian-qing LIU Qin-xing DonG Zhen-xiong WAnG Jiang-hai cHEn college of Field Engineering PLA University of Science and Technology wuhan ordnance n.c.o School

The finite segment method is used to model the line throwing rocket system.A dynamic model of line throwing rocket with flight motion based on Kane's method is presented by the kinematics description of the system and the consideration of the forces acting on the *** experiment designed according to the parameters of the dynamic model is *** simulation and experiment results,such as range,velocity and flight time,are compared and *** simulation results are basically agreed with the test data,which shows that the flight motion of the line throwing rocket can be predicted by the dynamic model.A theoretical model and guide for the further research on the disturbance of rope and the guidance,flight control of line throwing rocket are provided by the dynamic modeling.

关键词：火箭系统飞行运动实验仿真动态模型有限段方法参数设计飞行时间

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Effect of Auxiliary Gas Flow Parameters on Microstructure and Properties of Ta coatings Prepared by Three-cathode Atmosphere Plasma Spraying

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Journal of Beijing Institute of Technology 2022年第3期31卷 302-316页

作者： Jing cui Haiyang Xia Lang cui Guang Liu college of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China china civil Aviation Ground Special Equipment Research Base Tianjin 300300China ningbo Branch of chinese academy of ordnance Science Ningbo 315103ZhejiangChina

Based on the three-cathode plasma spraying system,tantalum(Ta)coatings were pre-pared on the substrate of cucrZr *** effects of different auxiliary gas(helium)flow rates on the microstructure,phase composition,mechanical and wear resistance properties of Ta coatings were *** results showed that the oxidation degree of the coatings decreases first and then increases with the increase of the auxiliary gas *** the auxiliary gas flow rate is 70 L·min-1,the oxidation degree of the coating is the lowest,minimum value of the porosity is 0.21%,and the bonding strength reaches the maximum,59.3 *** this time,the coating wear rate is 0.0012 mm^(3)·n^(-1)·m^(-1)with the best wear *** indicates that the auxiliary gas flow has an important influence on the quality and surface mechanical properties of tantalum coating.

关键词： plasma spraying tantalum(Ta)coating auxiliary gas flow rate bonding strength tri-bological property

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The atomic interface effect of single atom catalysts for electrochemical hydrogen peroxide production

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nano Research 2023年第8期16卷 10724-10741页

作者： Kaiyuan Liu Pengwan chen Zhiyi Sun Wenxing chen Qiang Zhou Xin Gao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Advanced Technology Research Institute Beijing Institute of TechnologyJinan 250307China Energy&catalysis center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China china academy of ordnance Science Beijing 100089China

Producing hydrogen peroxide(H_(2)o_(2))through an electrochemical oxygen reduction reaction(oRR)is a safe,green strategy and a promising alternative to traditional energy-intensive anthraquinone *** and renewable power could be utilized for onsite and decentralized H_(2)o_(2)production,demonstrating significant application ***,single atom catalysts(SAcs)have demonstrated significant advantages in the catalytic production of H_(2)o_(2)in 2e−***,the selectivity of SAcs in oRR once puzzled *** article reviews the research on the development and achievements of H_(2)o_(2)production by SAcs catalysis in recent ***,the structure-performance relationship is a guide to designing new *** advanced characterization techniques and theoretical calculation methods,researchers have a clearer and more thorough understanding of the impact of the atomic interface of SAcs on oRR catalytic *** coordination moiety formed between the active metal center atom and the support seriously determines the selectivity of SAcs,mainly manifested in the adsorption of*ooH ***,the atomic interface of metal atoms together with o/n co-coordination exhibit high selectivity and mass activity,and heteroatoms or functional groups on carbon supports present synergistic effects to promote the production of H_(2)o_(2)in 2e−*** and accurate regulation of the atomic interface of SAcs directly affects the 2e−oRR performance of the ***,it is important to deeply understand the atomic interface of SAcs and contribute to the development of novel catalysts.

关键词： single atom catalysts(SAcs) atomic interface effect hydrogen peroxide(H_(2)o_(2))production electrochemical catalysis

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Rational design of phosphorus-doped cobalt sulfides electrocatalysts for hydrogen evolution

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nano Research 2019年第12期12卷 2960-2965页

作者： Guoxing Qu Tianli Wu Yanan Yu Zekang Wang Yang Zhou Zhendong Tang Qin Yue Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Henan Key Laboratory of Photovoltaic Materials Henan UniversityKatfeng 475004China ordnance nco academy Army Engineering University ofPLAWuhan 430075China

Moderate anionic doping is an effective approach to improve the performance of electrocatalysts toward hydrogen evolution reaction(HER)since it can adjust the electronic structure,activesite,and *** reported studies mainly focus on designing P doped c0S2,while otherphases of cobalt sulfide,such as co1-xS and co9S8 doped with P are rarely investigated for HER ***,various cobalt sulfides(including coSg/co1-xS,co1-xS,and co9S8)doped with P are anchored on carbon cloth through a facile hydrothermal *** tested electrocatalysts,P doped co1-xS exhibits excellent electrocatalytic performance with an overpotential of 110 and 165 mV(***)for currentdensities of 10 and 100 mA·cm^-2,*** functional theory calculations reveal that P doped co1-xS possesses a smaller bandgapand more optimal hydrogen adsorption sites than pristine *** work initially investigates various cobalt sulfides doped with P and furthergets in sight into the activity improvement mechanism of P dopi ng,which could guide the desig n of earth-abunda nt HER electrocatalysts for the"hydrogen economy".

关键词： hydrogen evolution reaction electrocatalysts water splitting P doping cobalt sulfide

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Analysis of Professional Skill and the Teaching of Effective Interface ordnance n.c.o.

Analysis of Professional Skill and the Teaching of Effective...

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2011 2nd International conference on Education and Educational Technology (EET 2011)

作者： Zhu Tian-yu Jiang Zhong-bao Liu Yun Duan Shao-li wuhan Mechanical Technology college wuhan Technical college of communication

ISBN: (纸本)9783642247712

August 2010, the PLA units associated together human resources and social security men made a "People's Liberation Army soldiers on active service professional skill requirements", marks the professional skill army soldiers entered a new stage of development. Soldiers for the full implementation of professional skill, this combination of armaments to protect the professional soldiers of the actual situation of professional skill, Analysis of the professional skill and armaments to protect the professional noncommissioned officer education and teaching of articulation.

关键词： Professional skill,n.c.o.

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Effect of Atmosphere on Synthesizing Hollow ceramic Microspheres by Self-reactive Flame Quenching Technology

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稀有金属材料与工程 2011年第S3期40卷 43-46页

作者： Lou Hongfei, Wang Jianjiang, Ye Minghui, Hu Wenbin ordnance Engineering college, Advanced Material Institute, Shijiazhuang 050003, china ordnance Engn coll Adv Mat Inst Shijiazhuang 050003 Peoples R China

In order to obtain high comprehensive performance hollow ceramic microspheres (HcMs), used Al-cr2o3 as the main reaction system, HcMs were prepared by Self-reactive flame quenching technology in Ar2 and n2 atmosphere respectively. Effects of the two different atmospheres on synthesizing HcMs were studied. Results show that in Ar2 atmosphere, because of incomplete reaction of agglomerate powders, porous particles with hollow structure and smooth-faced HcMs constitute the products. However in n2 atmosphere, because agglomerate powders react completely, all of them become smooth-faced HcMs. Results above show that experiment atmosphere is a important parameter to synthesize HcMs and to a great extent influences reaction process of agglomerate powders in the flame field.

关键词： hollow ceramic microspheres atmosphere self-reactive flame quenching technology

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