平台

The non-continuously moving state lies on the vehicle's structural characteristic. This air-cushion vehicle has two platforms, which are connected by two hydraulic cylinders. When it moves, one platform is fixed on ground as the base platform, and takes the other one as moving platform, then the vehicle can go forward by alternate movement of these two platforms. So the push-pull air-cushion vehicle is a self-propelled vehicle.

它的非连续运动形态取决于其结构特点，该气垫车由两个对称的子平台组成，中间通过液压油缸相铰接，运动时总是固定其中一个平台作为基础平台，而将另一个平台作为运动平台，基础平台通过液压缸推出或拉进运动平台交替动作，实现运动，因此推拉式气垫车是一种自走式气垫车。

Secondly identifies the relation of G / S model and space data services platform , space data services platform is the core of G / S model, the current space data service platform is in the initial stage of development, and the "Digital Earth platform" as a kind of space data service platform is the key issue which is studied , and with other space data services platform, it has many characteristics and advantages.

其次肯定了G/S模式与空间数据服务平台的关系，空间数据服务平台是G/S模式的核心，当前的空间数据服务平台正处于发铺的初级阶段，而"数字地球平台"是本课题重点研讨的一种空间数据服务平台，和其他空间数据服务平台比拟具有良多特色和长处。

From the view of design, there are mainly three solutions to depress this vibration: the first way is to enhance the collectivity stiffness of platform, it will make the structures heaver, that is to say, it can't meet the economic demand;the second way is to implement active control, however, it is difficult to be carry into execution and unable to decrease the expensive cost.

降低平台的冰致振动响应大致有三个途径：一是提高平台结构的总体刚度，这样做显然会使平台加重而不满足经济性要求；二是对平台结构的冰致振动进行主动控制，但是此种方案在恶劣的海洋环境中很难实施并且不会降低海洋平台的总体成本；三是对平台结构进行减振和隔振控制，相对来说，此种方案是行之有效并且经济实用的。

To develop new markets, achieve mutual benefit, we will be the spirit of customer first, abide by the contract, the price of suitable purpose and dedication to the vast numbers of users of our factory's flagship product is a test platform for the cast iron, cast iron crossed the platform, cast iron welding platform, cast iron assembly platform, power mechanical vibration test stand (also known as the trough or iron beams, and rail), cast iron box, testing rod, V-iron, granite platform as well as other rock measuring, flat iron, Mg-Al measuring series, square, flat feet, Mg, Al-light flat-foot, square angle square, square boxes, gear Beat Miriam, a 90-degreeì¨, migraine pendulum tester, crossed flat-panel, flat-panel assembly, welding plate, testing platform, surveying platform, Sizing Block machine Sizing Block, to track regulatory Sine, trough iron, power mechanical vibration test stand, combination of platform, portfolio assembled T-groove plate, instrument plate coordinate.

为开拓市场，实现互惠互利，我们将本着用户至上，信守合同，价格合适的宗旨，竭诚为广大用户服务我厂的主打产品是铸铁检验平台、铸铁划线平台、铸铁铆焊平台、铸铁装配平台、动力机械震动试验台、铸铁方箱、检验棒、 V 型铁、花岗石平台以及其他岩石量具，铸铁平板，镁铝量具系列，直角尺、平尺、镁铝轻型平尺、方形角尺、方箱、齿轮跳动仪、90度检定仪、偏摆检查仪、划线平板、装配平板、铆焊平板、检验平台、测量平台、垫铁、机床垫铁、地轨、正弦规、槽铁、动力机械震动试验台、组合平台、组合拼装T型槽平板、三座标仪平板。

Around the topic, the weak points of the traditional platform is analyzed first, such as complex arithmetic, long calculating time, high needs of hardware and so on. A real time control method based on virtual simulation is suggested to separate the complex positive/negative calculation of space kinematic and real time motion control. And a"3-2-1"type 6DOF platform is designed with the reference of the MAST (Multi-Axis Shaking Table) of MTS. The kinematic and dynamic calculation of the platform is finished. According to the calculating result, the control system of the"3-2-1"type 6DOF platform including 6 linear servo electric cylinders is designed and constructed. And the professional software Pro/E is used to do the 3D model and 6DOF motion simulation of the platform. The motion curves of the pistons of the 6 cylinders are exported with the simulation. At last the control software is programmed with Microsoft Visual Basic 6.0 and realizes the functions with the commands of GE series motion controllers. When loading the motion curves exported with the simulation, every cylinder can follow the curve very well and the platform realizes the hoped 6DOF motion.

围绕选题，本论文首先分析了传统的运动平台控制方法所存在的算法复杂、解算耗时长、硬件需求高的缺点，提出了一种基于虚拟仿真的实时控制方法，该方法将复杂的空间运动学正、反解与实时运动控制相分离；之后，参考MTS公司的MAST多轴振动平台，设计了新型的"3-2-1"型六自由度平台，并进行了运动学及动力学计算，根据相关计算结果，设计与搭建了包括驱动6个直线伺服电动缸在内的"3-2-1"型六自由度平台控制系统；接着，使用Pro/E对"3-2-1"型六自由度平台进行了三维建模和六自由度运动学仿真，并由仿真直接获得了6个直线伺服电动缸的活塞杆的相应运动曲线；最后使用Microsoft Visual Basic 6.0编写了控制软件界面，通过调用GE系列运动控制卡的各种命令函数实现了控制系统的相关功能，而当加载仿真得到的各缸运动曲线后，每缸均能很好地跟踪输入曲线，使平台实现了期望的多自由度运动。

This new platform, considering the relationship among teaching, learning and managing, solving the conflict of resources share and intelligence prosperity, adopting latest theory on learning and mature technology, has more advantages than the existing platform. Firstly, it integrates the advantages of Internet and Satellite communication system and achieves the seamless connection. Secondly, it adopts the coding technology of streaming media with MEPG-4, which makes it possible that the on-line instruction, the schedular broadcast instruction and the distributed course ware on demand can be broadcast on the two networks. Thirdly, it considers the problems of security, user certification and the protection of intelligence property. Fourthly, it is possible to link education resources from all united university, and is able to share resources for lifelong learning individuals or group.

此次清华大学远程教育播出平台的改造，本着现有平台与未来需求相结合；最新的学习理论与成熟的信息技术相结合；资源传输与对学生的学习支持相结合；教育资源开放与知识产权保护相结合的设计理念，综合考虑了远程教育环境中教、学、管三方面的需求和关系，因而具有多方面的优势：新平台整合了互联网和卫星网各自的优势，在技术上实现了天网与地网的无缝连接；新平台对传输的教育节目采用 MPEG-4编码方式进行流媒体播出，在传输上实现了基于两种网络的实时课堂直播、录播和基于互联网的分布式课件点播的多种需求；新平台集资源加密、用户认证和授权等功能于一体，可有效地保护远程教育中的知识产权；新平台将各联盟学校的教育资源进行整合后重新提供给学习的个体或团体，较好地实现了资源共享。

The key point of the structure of the utility model is that: the other side of the reducer that is arranged on the platform is provided with a hoisting device; the roller shaft end of the electronic controlled windlass is provided with a hub, a damper brake is arranged outside the hub; the input castellated shaft of the reducer that is arranged on the electronic windlass is provided with duplicate gears that have different amount of teeth.

本实用新型包括标准节，两侧标准节的中间为平台，电控卷扬机的卷绳通过平台上的滑轮同吊盘相连；平台上的减速器的一侧设置有可提升平台的具有卷绳的滚筒，平台上设置有具有滑轮的支架，其结构要点平台上的减速器的另一侧设置有提升装置；电控卷扬机的滚筒轴端设置有轮毂，轮毂外设置有制动闸；电控卷扬机的减速器的输入花键轴上设置具有不同齿数的双连齿轮，双连齿轮之间的凹槽内的拨杆同减速器外的摇把相连。

Key products include: cast iron plate, cast iron platform, the test platform, crossed platform, Maohan platform, fitter platform, table, Ping-foot, to me, V-type, V-iron, right-angle-foot, V-iron, foot bridge , Curved panels, machine damping Sizing Block, adjusted Sizing Block, partial-place, Jack, special wrench, gear Gear beat Tester; platform granite, marble slab, Ping-foot, V-iron, to me, Jiaochi, V-shaped blocks, such as platform support.

主要产品包括：铸铁平板、铸铁平台、检验平台、划线平台、铆焊平台、钳工平台、工作台、平尺、方箱、V型架、V 型铁、直角尺、V型铁、桥尺、弯板、机床减震垫铁、调整垫铁、偏摆仪、千斤顶、特种扳手、齿轮齿圈跳动检查仪；花岗石平台、大理石平板、平尺、V型铁、方箱、角尺、V型块、平台支架等。

Business: metal processing machinery manufacturing, mold | fixture | Instruments accessories processing | repair and sales of major products: flat-panel inquiry scraping, grinding plate, testing platform, crossed platform, the assembly platform , Maohan platform, surveying platforms, the basic platform, testing platform, welding platform, San Zuobiao platform, combined platform, T-slot splicing platform, parallel-foot, the bridge-foot, rectangular-foot, point-foot , Cubic feet, to me, V-Rail, the partial-place check, the new partial-place, micrometer, school-axis, flatness Qiaoban adjustable, adjustable level of regulation, crossed disk, magnetic to me, magnetic V-type planes, V-shaped pieces of steel planes, machine damping Sizing Block, adjustable Sizing Block, ladder Sizing Block, Pad, chrome-plated jack, the southbound span Jack, Park-testing wand, Park-Jiaochi, table with chrome Park Jiao Chi-chu, Her taper gauge, Her taper shank test rods, 7:24 taper shank test rods, proof-reading Cypriot ring for smooth, sinusoidal regulation, the board cards, aluminum model of the arc, the arc of mold Model-foot aluminum, magnesium-alloy-foot primers, Dummy Bar, granite slab, granite-foot, granite cubic feet, granite, me, V-shaped granite blocks, wrenches Plum, knock - Wrenches, stay wrenches, single wrenches, bending handle wrench, straight handle wrench, convex-wrench, pry bar wrenches, sockets and heavy anti-explosive tool product line.

经营范围：金属加工机械的制造，模具|夹具|仪器仪表配件的加工|修理及销售主要产品有：刮研平板，研磨平板，检验平台，划线平台，装配平台，铆焊平台，测量平台，基础平台，试验平台，焊接平台，三座标平台，组合平台，T型槽拼接平台，平行平尺，桥型平尺，直角平尺，角度平尺，方尺，方箱，V型铁，偏摆检查仪，新型偏摆仪，测微仪，校轴器，平直度可调桥板，可调高低规，划线盘，磁力方箱，磁力V型架，钢件V型架，机床减震垫铁，可调垫铁，阶梯垫铁，垫块，镀铬千斤顶，涮漆千斤顶，园柱检验棒，园柱角尺，带表镀铬园柱角尺，莫氏锥度量规，莫氏锥柄检验棒，7：24锥柄检验棒，校对光滑专用塞环规，正弦规，卡板，铝合金对弧样板，结晶器对弧样板，铝合金平尺，镁铝合金平尺引，引锭杆，花岗石平板，花岗石平尺，花岗石方尺，花岗石方箱，花岗石V型块，梅花扳手，敲击扳手，呆扳手，单头扳手，弯柄扳手，直柄扳手，凸型扳手，撬棒扳手，重型套筒及防爆工具系列产品。

This invention discloses an IC phone communication method based on the FSK mode including: loading and transmitting ciphered sequences, ciphered card information, called number information and other interaction information between an IC terminal and a process platform in the mode of FSK information, in which, the platform authenticates the authority and charges, if the deduction at the IC terminal is correct, then it sends signals of anti-stealing making phone calls periodically to the platform, which differentiates the correctness of the signals, if they are wrong, it releases the call, when the communication is finished and the calling rings off first, the platform receives the identification signals of the ring-off of the calling to cut off the call of the called side and release the voice channel between the platform and the called side, then processes balance information and releases the call finally.

本发明公开了一种基于频移键控方式的IC卡电话通信方法，其主要方案是IC卡终端与处理平台之间通过FSK信息方式承载和传输加密序列、加密卡信息、被叫号码信息及其它交互的信息，由处理平台进行鉴权和计费；如果IC卡终端扣费正确则周期性向处理平台发送防盗打信号，处理平台鉴别防盗打信号的正确性，如果错误则释放呼叫；当通信结束后主叫先挂机时，处理平台收到主叫挂机标识信号后首先切断被叫侧的呼叫，释放处理平台与被叫侧之间的话路，然后再进行余额信息的处理和最后释放呼叫。使用本发明提出的方法，使得IC卡终端与处理平台之间的信息交互流程更加简单、清晰，提高了信息交互效率，并能及时释放话路，节约中继资源。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。