PI control based on fuzzy set-point weighting tracking for hydraulic crane boom system

A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system （HCBS）. Two valve-controlled PI controllers, which include a proportional feedforward controller based on fuzzy set-point weighting following and a limited semi-integrator（LSI）, are designed respectively. LSI is used to limit output signal and to prevent wind up at the low frequency of the spectrum. By using a range camera and an electronic feedback control, the tip damping on the HCBS can be adjusted artificially. A collaborative control simulation technique of HOPSAN and MATLAB/SIMULINK is applied to the controller design. Simulation results show that the proposed PI control system has less overshoot as well as faster response. The tip damping on the HCBS during operation is improved.

Design and Simulation of a Passive Vertical Suspension System for Spray Boom Structure

The most usual way of using chemical method to protect crop against weed, insects, and fungi is spraying the mixture of chemicals and water onto crop through the nozzles. Sprayers usually moved on the field by tractor, and tractor induced unwanted vibration to sprayer because of uneven soil or terrain. This oscillation leads to over-doses and under-doses of chemical sprayed on the field. For this reason, many commercial and some theoretical suspension were made to reduce undesirable vibration. Therefore, in this study a finite element based model was established to represent the dynamic behavior of spray boom structure with 8m width. The first tenth natural frequencies were obtained between 9.25 Hz to 1,182.5 Hz. Also, a passive vertical suspension was designed to remove unwanted vibration with 0.5 vibration transmissibility. Finally, the suspension system was simulated to be as certain of its efficiency. The results of simulation have good agreement to the proposed aim.

Boom Box 3爆炸机独立激发新模式应用开发与测试

随着国内外节点仪的应用,采用全节点仪采集的项目越来越多,有线地震仪的井炮激发方式已经不能完全适用于全节点采集系统,因此,针对全节点采集项目,以“去有线采集系统和无线电台通讯网络”为核心思路,开发出基于Boom Box 3爆炸机的独立激发新模式。本文通过对独立激发新模式的研发思路、放炮操作流程、炮后信息下载以及测试等各方面进行了详细介绍,最后,对基于Boom Box 3爆炸机独立激发新模式的优点进行了分析。

Boom Box3爆炸机独立激发模式简介及应用

Boom Box3爆炸机独立激发模式是一种全新理念的井炮高效采集模式,它基于GPS进行授时定位,基于WiFi-HTML技术进行参数设置和炮后信息处理,基于“时间槽”隔离技术进行自主激发,在复杂地形施工条件下,能够有效提高地震采集效率。本文介绍了Boom Box3爆炸机,对Boom Box3独立激发模式的原理、特点进行了分析,通过Boom Box3独立激发模式测试、应用实例及效果分析,认为该技术有助于提高南方山地和黄土塬地区全节点采集项目的施工效率,降低施工成本。

Boom Clay蠕变特性研究

Boom Clay为比利时第三纪细密黏土沉积物,其力学性质十分复杂,尤其是其显著的蠕变特性更需进行广泛的试验和深入的理论研究。通过室内固结和三轴蠕变试验,研究不同应力水平下的蠕变特性;建立以不可恢复应变为变量的不显含时间的分离型屈服面蠕变本构模型,避免了传统显含时间项的蠕变模型在土体经历加、卸载过程等复杂工况的实际计算中,具体蠕变时间确定的难题。将所建新型蠕变模型在ABAQUS软件中实现二次开发,并通过不同蠕变参数下的基本性能检验和蠕变试验的模拟,验证了所建模型的正确性和所编程序的可靠性。

Boom黏土热-力耦合弹塑性损伤模型研究

黏土的热-力耦合本构模型研究在许多工程领域,尤其是核废料地下处置方面有着十分重要的工程意义。根据Boom黏土的在不同温度下的三轴与固结试验的结果,综合考虑了温度对黏土的强度与弹性模量的影响,在Drucker-Prager(简称D-P)帽盖模型的基础上,引入了硬化方程和热损伤、力学损伤的演化方程,建立了适用于黏土的热-力耦合弹塑性损伤本构模型。将模型在ABAQUS中进行了二次开发,根据试验结果反演得到了Boom黏土的模型参数。利用所建立的本构模型,对比利时HADES试验室中的ATLAS III现场试验进行了数值仿真,计算结果表明,模型的计算结果与现场实测的结果能较好地吻合,证明了模型的合理性。

Studies on Distribution and Chemical Characteristics of Copper in Cells of Setcreasea purpurea Boom

[Objective] The aim of this study was to reveal the mechanism of Cu2+ hyper-accumulator in Setcreasea purpurea Boom from the angle of distribution characteristics and binding form of Cu2+ in tissue cells.[Method]The distribution characteristics of Cu2+ in subcells of Setcreasea purpurea Boom was studied by the technique of differential centrifugation,and the binding form of Cu2+ in roots and leaves of Setcreasea purpurea Boom was also investigated by the sequential chemical extraction method and the enzymolysis method.[Result]Cu2+ in roots mainly distributed in the cell wall which is accounting for one third of the Total Cu2+ in roots,while Cu2+ in leaves mainly distributed in the chloroplast which is accounting for a quarter to the Total Cu2+ in leaves.Under the high concentration of Cu2+ or the extended treatment duration,the translocation of Cu2+ in root cells into the cell wall increased but the translocation of Cu2+ in root cells into the plastid decreased,while the translocation of Cu2+ in leaf cells into the chloroplast increased but the translocation of Cu2+ in leaf cells into the cell wall decreased.Cu2+ in leaves was mainly combined with amino acid,small molecular polymeric pigments,protein and polysaccharide,while Cu2+ in roots was mainly combined with cell wall substances such as cellulose and membrane-bound protein.[Conclusion]The distribution characteristics and binding form of Cu2+ in cells is possibly one of the dominant mechanisms for Cu2+ hyper-accumulator in Setcreasea purpurea Boom.

Specific Protein Properties of Setcreasea pupurea Boom under Copper Stress

[Objective] This study was to investigate the expression of the specific protein in Setcreasea purpurea Boom under copper stress, with the aim to clarify the copper tolerance mechanism of S. purpurea. [Method] Methods of water culture, elec- trophoresis and chromatography were used to analyze the molecular weight of the specific protein in the copper hyperaccumulator S. purpurea, as well as its expression time and the minimum copper concentration for the expression. And the specific protein was isolated and purified. [Result] Under copper stress, the minimum concentra- tion of copper to induce the expression of the specific protein from S. purpurea was 50 umol/L, and the expression time of the protein was in the 4th week with the molecular weight of 89.4 kDa. [Conclusion] The results show that the copper tolerance of S. purpurea is closely related with the expression of the specific protein.

BOOMBOX编译码器常见故障的排除

BOOMBOX编译码器是新一代数字式地震遥爆系统。该系统功能较强，广泛应用于各种地震勘探仪器系统中。介绍了该系统在使用中遇到的常见故障，并给出了较为详细的维修方法。

Analysis of Gene Differential Expression of Setcreasea purpurea Boom under Copper Stress by cDNA-AFLP

[Objective] The aim was to explore biological function of related genes in Setcreasea purpurea Boom under copper stress and to study the mechanism of its copper-resistance from standpoint of molecular biology in order to solve the problem of copper pollution. [Method] Setcreasea purpurea Boom was taken as experimental material which enjoys enrichment ability to cupric ion. About 90 fragments of differential expression were obtained by cDNA-AFLP and silver staining technique, among which, 17 fragments were amplified. After purification and identification, sequences of 6 differential fragments were got and used for BLAST X contrast. [Result] Six differential expressed fragments may play roles when Setcreasea purpurea Boom was under copper stress. The homology achieved 49% between differential sequences of E5MG-3 and of Arabidopsis thaliana mRNA （accession numbers： AAM62956.1）, homology was 53% between sequences of E4MB-2 and Solanum tuberosum mRNA （accession numbers： A5A717.1）, and 65% between sequences of E6MG-1 and Colocasia esculenta （L.） Schott mRNA （accession numbers： AAO62313.1）. It can be concluded that differential expressed genes are related to cell signaling, antioxidation, metabolism and protein modification. [Conclusion] The study has laid foundation for further exploration of regulatory network about response of Setcreasea purpurea Boom to copper stress.

增强现实BOOM系统设计

在增强现实系统中,头盔显示器的显示效果和重量之间一直存在矛盾。针对这个问题,结合在研的光学透视式头盔显示系统,设计了一个增强现实BOOM系统。针对设计的BOOM系统,进行了机械跟踪算法的推导,并进行了理论验证。该系统较好的解决了头盔显示器过重给使用者带来的不便,并且有较高注册精度和速度。

BOOM BOX译码器激发能力研究与改进

BOOMBOX译码器在黄土塬地区施工中，采用多井组合激发时，由于激发网络电阻增大，致使拒爆、丢炮和丢失验证时断信号（confirmation time break，CTB）的现象频发，严重制约了地震生产。针对该译码器的激发能力问题，分别从点火电压、充电时间、点火电流和CTB产生信号原理等方面进行了详尽的分析研究，并通过电路改进和现场试验，找到了提高其激发能力的一种较为便捷的方法。通过现场使用，取得了较好效果。

BOOM BOX中继器在地震勘探中的应用

介绍了新一代放炮系统——BOOM BOX的性能优势，其具备的中继功能有效地解决了408UL仪器在山区、沙漠等地形复杂地区实现无线放炮的问题。与408UL有线放炮系统相比，应用BOOM BOX的中继器进行无线放炮，更加灵活、方便，生产效率更高。讨论了BOOM BOX与408UL的联机问题，给出了应用中继技术进行无线放炮时BOOM BOX的参数设置方法，并对它的无线中继原理进行了深入的分析。这对于正确应用BOOM BOX系统的该项功能具有积极的意义。

BOOM BOX与GM338接口电路的改进

本文针对BOOM BOX系统在使用中存在的一些问题,对BOOM BOX与GM338电台接口电路进行了分析,找出了存在的问题,并对其接口进行了改进和优化。

BoomBoxAXIM软件在DELL掌上电脑中的安装及备份

Boom Box放炮系统的系统参数是通过DELL掌上电脑来修改的,一旦掌上电脑供电中断(掉电),存放其中的BoomBoxAXIM软件就会丢失,致使掌上电脑无法使用。本文详细介绍了BoomBoxAXIM软件在DELL掌上电脑中的安装、备份及掉电时的恢复方法。

Effects of temperature and thermally-induced microstructure change on hydraulic conductivity of Boom Clay

Boom Clay is one of the potential host rocks for deep geological disposal of high-level radioactive nuclear waste in Belgium. In order to investigate the mechanism of hydraulic conductivity variation under complex thermo-mechanical coupling conditions and to better understand the thermo-hydromechanical(THM) coupling behaviour of Boom Clay, a series of permeability tests using temperaturecontrolled triaxial cell has been carried out on the Boom Clay samples taken from Belgian underground research laboratory(URL) HADES. Due to its sedimentary nature, Boom Clay presents acrossanisotropy with respect to its sub-horizontal bedding plane. Direct measurements of the vertical(Kv)and horizontal(Kh)hydraulic conductivities show that the hydraulic conductivity at 80℃ is about 2.4 times larger than that at room temperature(23℃), and the hydraulic conductivity variation with temperature is basically reversible during heatingecooling cycle. The anisotropic property of Boom Clay is studied by scanning electron microscope(SEM) tests, which highlight the transversely isotropic characteristics of intact Boom Clay. It is shown that the sub-horizontal bedding feature accounts for the horizontal permeability higher than the vertical one. The measured increment in hydraulic conductivity with temperature is lower than the calculated one when merely considering the changes in water kinematic viscosity and density with temperature. The nuclear magnetic resonance(NMR) tests have also been carried out to investigate the impact of microstructure variation on the THM properties of clay. The results show that heating under unconstrained boundary condition will produce larger size of pores and weaken the microstructure. The discrepancy between the hydraulic conductivity experimentally measured and predicted(considering water viscosity and density changes with temperature) can be attributed to the microstructural weakening effect on the thermal volume change behaviour of Boom Clay. Based on the experimental results, a hydraulic conductivity evolution model is proposed and then implemented in ABAQUS. Three-dimensional(3D) numerical simulation of the admissible thermal loading for argillaceous storage(ATLAS) Ⅲ in situ heating test has been conducted subsequently, and the numerical results are in good agreement with field measurements.

Boom Box爆炸机充电器原理与维修实例

美国Seismic Source公生产的Boom Box爆炸机是国内地震勘探市场的主流设备,其配套的铅酸电池充电器为国产小麻雀CD30Q06F或CD30Q06F充电器。该充电器没有附带电路图,给维修工作带来了不便。文章介绍了几个充电器维修实例,并介绍了充电器的单片机控制电路原理。

New Knowledge-based Genetic Algorithm for Excavator Boom Structural Optimization

Due to the insufficiency of utilizing knowledge to guide the complex optimal searching, existing genetic algorithms fail to effectively solve excavator boom structural optimization problem. To improve the optimization efficiency and quality, a new knowledge-based real-coded genetic algorithm is proposed. A dual evolution mechanism combining knowledge evolution with genetic algorithm is established to extract, handle and utilize the shallow and deep implicit constraint knowledge to guide the optimal searching of genetic algorithm circularly. Based on this dual evolution mechanism, knowledge evolution and population evolution can be connected by knowledge influence operators to improve the conflgurability of knowledge and genetic operators. Then, the new knowledge-based selection operator, crossover operator and mutation operator are proposed to integrate the optimal process knowledge and domain culture to guide the excavator boom structural optimization. Eight kinds of testing algorithms, which include different genetic operators, arc taken as examples to solve the structural optimization of a medium-sized excavator boom. By comparing the results of optimization, it is shown that the algorithm including all the new knowledge-based genetic operators can more remarkably improve the evolutionary rate and searching ability than other testing algorithms, which demonstrates the effectiveness of knowledge for guiding optimal searching. The proposed knowledge-based genetic algorithm by combining multi-level knowledge evolution with numerical optimization provides a new effective method for solving the complex engineering optimization problem.

Boom Box爆炸机常见故障分析

本文根据云南物探公司仪器维修部门对Boom Box爆炸机的维修经验,对生产中使用Boom Box爆炸机常见的故障进行了分析、总结,将所有故障归纳为三类:电源电路故障、高压及验证时断电路故障、井口信号输入电路故障。文章对Boom Box爆炸机的电路原理进行了详细分析,并据此绘出了相应的电路图,从而基于相关电路原理分析出了故障原因,详细描述了Boom Box爆炸机常见故障的检查过程和维修方法。

Numerical Modeling of Floating Oil Boom Motions in Wave-Current Coupling Conditions

Containment booms are commonly used in collecting and containing spilled oil on the sea surface and in protecting specific sea areas against oil slick spreading.In the present study,a numerical model is proposed based on the N-S equations in a mesh frame.The proposed model tracks the outline of the floating boom in motion by using the fractional area/volume obstacle representation technique.The boom motion is then simulated by the technique of general moving object.The simulated results of the rigid oil boom motions are validated against the experimental results.Then,the failure mechanism of the boom is investigated through numerical experiments.Based on the numerical results,the effects of boom parameters and dynamic factors on the oil containment performance are also assessed.