Small-scale hydraulic actuation systems are especially suitable for narrow space and harsh environment arrangement. Due to its flexibility, thin and long hose is used to connect components, uncertainty of the system model resulted from the hose expansion has severe impacts on control properties of the nonlinear system. In order to solve the uncertainty problem, this paper proposes a measurement method of hose bulk elastic modulus and a hose modeling method based on Generalized Regression Neural Network (GRNN). By constructing a dedicate test device, the pressure and volume changes of the hose are measured, and the raw data needed for the hose modeling is obtained. The simulations show that the hose model based on GRNN has good effects on predicting the volume dynamic change process, and could be applied to the modeling and simulation of hydraulic system with flexible hose satisfactorily.

Uncertainty of a flowmeter normally changes after long-term service, which brings about a difference both in steady-state and dynamic measurement result by the meter. In this paper, a piezoelectrically-actuated single nozzle flapper valve generates a short-rise time flow change as an excitation for dynamic flowmeter calibration. A commercially available piezoelectric stack is adopted for its fast response. The dynamic performance of the flowmeter is obtained by comparing the time between the pressure difference across the reference restrictor and the indicated flow rate. In order to widen the excitation flow and improve the linearity with the voltage applied, design of the return restrictor is studied. Due to ferromagnetic hysteresis, nonlinear compensation to the piezoelectric stack is implemented based on modeling the hysteresis effect. Simulation and experiments show that proper flow area of the return restrictor allows wider excitation flow rate range. The compensation on the stack can effectively improve the linearity of the excitation flow rate and the input required.

A compact and flexible hydraulic double-cylinder actuation scheme is proposed for use in applications, especially where power density is extremely demanding. In view of flexible amounting requirements, long and thin hoses were utilized to connect two cylinders. Affecting the actuation preciseness, volume variation of the hoses caused by pressurized oil and bubbles was the main problem the system encountered. In this study, an active disturbance rejection control (ADRC) strategy was adopted for the improvement of displacement control performance under uncertain external load. After the experimental verification of the necessity of a hose model for the system, a centralized-parameter hose model was constructed where the coefficients are determined on the basis of the experimental data. Additionally, the system and the controller proposed were mathematically modeled. Simulation results shows that the system using ADRC exhibited higher displacement accuracy and better dynamic performance than that using PID (Proportion-Integral-Derivative) or fuzzy PID. ADRC has a stronger disturbance rejection ability. ADRC is an effective solution to nonlinear control of systems with uncertain parameters or various loads.

Response duration is a key index for evaluating the dynamic performance of a flowmeter. Usually, the duration length can be identified according to the time difference between the start of the change of flow rate into the measured meter and the end of the change of the indicated value. The flow into the meter for dynamic measurement or calibration is also called excitation flow, a change in the short-rise time flow, generated by a dedicated system. Because harsh flow rate variation by the excitation system is particularly difficult to control with high accuracy, changes in the short-rise time flow present immense challenges. The purpose of this article is to study the compensations of strong nonlinear characteristics of the proposed dynamic measurement system. The system includes a piezoelectrically actuated double-nozzle flapper valve and four specific liquid restrictors. The system model is established, which considers the hysteresis behavior of the actuator and the elasticity of the flapper. Simulations under typical conditions are implemented to examine how the hysteresis compensation affects the flow rate response of the system. Experimental data conform to the simulation. Results show that the linearity of the flow rate variation generated by the excitation system considerably improves with compensation on the actuator. The system can respond at approximately 1000 Hz with only 0.5% hysteresis of the actuator. With the hysteresis compensation to the actuator, the flow rate is approximately linear. The flow rate variation is controllable and measurable with the same voltages applied. Higher flow rate variation leads to a shorter response to per unit variation.

After long-term service, flowmeter characteristics such as uncertainty or dynamic response will change due to normal wore structure. A dedicate system is presented in this article. It consists of a piezoelectric stack, a double-nozzle flapper valve, a reference restrictor with pressure difference transducer and a return restrictor. In order to well understand how experimental condition affects dynamic measurement characteristics of a flowmeter, two gear flowmeters and one turbine flowmeter are taken as study objects, on which simulation and experiment are implemented. Supply pressure of the system and excitation voltage applied to the piezoelectric stack are selected as two typical experimental conditions. Relations between these two parameters and dynamic performance of flowmeters are analyzed. The experimental results agree well with the simulation. The experimental results indicate that higher supply pressure and excitation voltage lead to wider range flow rate, which tends to extend the response duration of the indicated value. The proposed index, response duration per unit flow rate variation, can effectively describe the response speed of a flowmeter under different conditions.

In this paper, we propose a coupling technique of modified boundary element method (MBEM) and method of fundamental solutions (MFS) for solving the forward scattering problem of Love waves. First, the boundaries and interfaces of the intact structure is discretized for BEM formulation. To suppress spurious reflections brought about by model truncation, the far-field behaviors of guided waves are incorporated into the basic BEM equations as the modification items. Secondly, the scattered wave field, due to surface or internal cavities, is modeled as radiated from a series of "virtual point sources", which are placed within the actual flaw regions. The strengths of these sources are determined by free-traction conditions of total wave field on the cavity surface, which forms an MFS configuration. The MBEM and MFS parts are combined to form a total matrix, and the near-field displacements, far-field scattering coefficients for propagating modes, as well as the source strengths are solved simultaneously.

Equipment Manufacturing Industry is the foundation for national economic development,so it is of great significance to take concrete measures to promote the equipment manufacturing industry's innovation and development.In recent years,with " Industry 4.0","Made in China 2025" and "Internet Plus" strategies being gradually deepened,the industry innovation system characterized by intelligent production and service network becomes more and more perfect.Chinese equipment manufacturing industry will certainly blend in the global integration of industrial network system and realize the transformation and upgrading.Otherwise it will face the risk of survival of the fittest in the competition.In this background,the study shows that a new type of industry innovation platform is an important tool to the development of industrial innovation,whose functions include not only management and information services,but also personalization,module integration and the supply strategy of the entire value chain.Using structure analysis method and function/value analytic method,the study indicates that with the availability of intelligent production and service network,the platform is basically composed of the decision-making system,information awareness and transmission system,intelligent production and service organization system and the innovation supporting system.Further studies find that the platform is transforming from "being embedded" in the industrial organization system to "blending" in the intelligent production and service network system,which has various existence forms.

研究发现,资本、人才、信息化要素对技术成果转化均有正向驱动作用,而专利要素的驱动作用并不明显;而在考虑信息化调节条件下,资本、人才与专利要素对技术成果转化的驱动作用均呈显著正向性,其中,资本与专利要素的驱动作用相比之前有进一步提升.

在中国智造2025和工业4.0目标指引下,江苏应提升智能制造水平,以信息化为载体驱动高技术成果转化.信息化建设是提升资源要素利用效率的重要手段,对驱动江苏技术创新及成果转化工作不可或缺.围绕这一结论,对江苏十三五期间信息化建设与智能制造战略提出相关建议.

This paper aimes at structure and function of “Intelligent production and service network system industry innova-tion platform”. It describes the structure of the platform by the“Organization chart”and describes the operating mechanism of platform function by the“Control flow chart”. And then, it analyzes how to promote the high-end of the traditional indus-tries. Result finds that, if the platform system and the mechanism are perfect, it would regulate the mode of economic growth, reasonable allocation and scientific pricing production factors, make up for the defects of our country’s economic system, subversion of the traditional thinking mode of production cooperation, balance the relationship between investment and consumption.

该文研究了智能生产和服务网络条件下产业创新平台的内涵和框架,并分析了平台的网络集成、价值集成和全程价值链供给等全新功能;在此基础上,提出了解决平台领导权、促进产业升级以及提高资源和创新效率的平台运行机制,为平台的建设和良性运行提供了借鉴.

大众创业、万众创新既是经济发展的动力,也是解决大学生就业的一种途径.本文分析了"统计学"在大学生创业前、创业中的作用,从市场调研、市场预测、产品质量管理、财务分析、人力资源管理、企业发展战略等方面展开研究.文章的最后指出:教师在授课过程中应采用多种教学方式或手段;学生在学习"统计学"时要注重理论与实践的结合.

利用1995-2012年中国五个一级高技术产业面板数据,建立差分GMM模型、系统GMM模型,从动态视角分析了市场集中度、市场收益、市场外资化对创新成果转化的影响特征,研究发现:市场集中度对创新成果转化呈显著促进作用,若就此而言,市场集中度的适度提升可以容忍;市场收益提升可激励高技术产业创新成果转化,且市场集中度对市场收益促进创新成果转化有正向调节作用;外资所占市场份额的提升,对创新成果转化的影响呈倒“U”型特征,且市场集中度对外资势力因素促进创新成果转化有正向调节作用;在动态视角上,创新成果转化活动具有正向累积影响效应.相关结论和建议可为我国高技术产业创新成果转化实践提供借鉴意义.

统计学的双语教学有利于培养专业知识与外语能力兼备的人才。本文在对统计学的双语教学的必要性进行分析的基础上，对统计学双语教学中的教材、教学模式、软件使用的选择等问题进行了探索，最后指出统计学在双语教学中可能存在的问题及解决措施。

lightning protection is an important part of design of modern plane. In order to determine the aircraft lightning characteristics, with reference to the US Department of Defense Mil-Std-1757 and SAE ARP5416 Aircraft Lightning Test Method(2005 version) and other standards, the lightning simulation experiment with plane model are made in order to position the initial leader contact area and to determine the different levels of lightning zones. The area where is subject to flashover is analyzed and the possible conduct route between pairs of entry and exit points through the plane structure is identified. The aircraft lightning zones are determined qualitatively through the tests which could provide actual reference to the aircraft lightning protection and the structural optimization design.

新常态下,传统产业创新平台创新动力不足、成果转化效率低等问题日趋严重.针对这一问题,研究了智能生产与服务网络体系下产业创新平台新的构成形式、参与主体、职能分配.通过构建平台功能框架,界定各参与主体职能范围与合作路径,提出平台领导权分配思路.通过平台业务流程实现无形资产到有形成果转化的目标,并优化业务流程的智能与服务化控制,可为构建产业创新平台,促进经济发展提供借鉴.

Based on electromagnetic topology and statistical concepts, Power Balance (PWB) method is used to estimate the magnitude of electromagnetic energy in electrically large system under high-frequency interference. The comparison of results obtained from PWB method and full-wave analysis method shows that PWB method can indeed provide effective data that meets certain accuracy requirement. This article uses PWB method to evaluate mean quality factor and the shielding effectivenes of the the Boeing 747-8.Comparison with the full-wave analysis method proves that this method has advantage of convenient and fast and has wide range of usage scenario.

利用1995-2012年中国五个一级高技术产业的面板数据,建立固定效应模型、系统GMM模型,对资本、人才、外部技术、政府资助等投入要素影响中国高技术产业创新成果转化的特征进行了分析,研究发现:(1)不同时期的创新成果转化活动具有正向累积影响效应,即前期的创新转化成效对本期创新转化活动产生显著促进作用;(2)资本性投入对产业创新成果转化起显著抑制作用;(3)人才资源投入显著推动产业创新成果转化;(4)外部技术投入对产业创新成果转化的影响呈显著倒U型趋势特征;(5)政府财政性激励并未有效促进产业创新成果的转化,反而起到显著抑制作用.相关结论和建议可为中国高技术产业创新成果转化实践提供借鉴意义.

自1995年以来,我国高技术产业研发投入和产出有较大增长,但技术成果的产业化效率到底如何,针对此问题,构建了基于专利转化为新产品销售为产出变量的超越对数随机前沿模型,利用SFA方法对各环境因素对专利产业化效率的影响进行分析.结果显示:市场份额、外向化程度、企业及金融机构资金投入、产业集聚程度等因素对专利产业化效率有显著促进作用,而国有化程度、政府科技资助却起到反作用,此外,市场效益的影响并不显著.在各产业效率比较中,电子计算机及办公设备制造业、电子及通信设备制造业效率值较高,航空航天器制造业处于中下水平,而医药制造业、医疗设备及仪器仪表制造业效率值明显偏低.

军民融合产业创新平台的组成元素包括模块供应商、模块集成商、基础设施、外部资源、科研组织和服务组织等.平台的公共性和军事性决定其建设和运行须基于政府规制;模块化是其产品研发生产的基本组织模式;市场机制是其遵循的基本机制.在平台初创阶段,为鼓励产品供给方积极参与国防供给,须为其提供税收优惠或财政补贴,并予以信誉支持.随着平台逐步发展并走向成熟,需求方需求范围逐步扩大,信誉效应不断显现,使得供给方产品市场不断扩大,规模效益逐步实现.