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[en] The Review Committee which studied the document entitled 'The NTF Interlock Box' requested more detailed information on the exact role of the red key labeled NTF Reset and Enable. This document is being written in response to that request. It should be considered an appendix to the earlier document and is best understood if one has already studied the earlier document including its Figures 1 and 2. As before, this is intended to give a basic understanding of how the system works. Detailed information of the type needed to build or repair a module is available on drawings to be specified later. The key plays two distinct roles. First, it is used to secure the NTF radiation areas. Second, it is used to turn on and control the ramp signals to the 58° and 32° magnet power supplies.
[en] This article presents, as a polemic exercise, a new approach to road construction in marshland areas of oil and gas producing regions of Western Siberia. The approach is based on the use of novel modular elements that can be assembled into an integral structure by means of topological interlocking. The use of modern superlight concrete in conjunction with the new design systems based on the modular principle opens up new avenues to solving problems of road construction in regions with unstable, boggy soils. (paper)
[en] Stiffness adjustment is essential to enhance the environment adaptability of many machines and soft robots. In this paper, a principle for stiffness variation based on fiber-reinforced structure matching (meshing) was proposed. By this proposed method, a flexible flat structure can change its stiffness more readily compared to existing approaches. The basic principle is that two soft laminates made of fibrous composites have complementary shapes that can interlock with each other in a controlled way; the resulting structure will be soft when the two laminates separate, but rigid when the two laminates interlock with each other. Therefore, the stiffness of a structure can be adjusted by altering between the separated and matched states. The principle was validated by a matching structure composed of two commercial toothed belts, which can change its stiffness up to 40 times just by a small vacuum pressure of 0.4 atm. (paper)
[en] Using acoustic resonators, we have investigated the mechanical stiffness of contacts between rough surfaces. In the first part, the underlying acoustic model is validated with experiments showing a transition from elastic to inertial loading. The second part is concerned with the increase in contact stiffness induced by transient exposure to a humid environment. A novel mode of surface deformation is proposed, which builds on a capillary instability. Under certain conditions, a slight decrease in the mean distance between the two surfaces may induce a rather strong increase in capillary attraction, while leaving the elastic forces of repulsion almost constant. The thus-created negative differential spring constant induces a collapse of the gap in-between neighboring load-bearing asperities. The initial decrease in distance may either be induced by local asperity creep or by distortions of the contacting surfaces on a larger scale, which improve the interlock of the asperities at a small cost of strain energy
[en] The China Spallation Neutron Source (CSNS) consists mainly of an H- linac as an injector and a proton rapid cycling synchrotron. Timing system is an important part of CSNS. The timing system prototype developments are based on the Event System 230 series. We use two debug platforms, one is the EPICS base 3.14.8. IOC that uses MVME5100, running vxworks5.5 version; the other is the EPICS base 3.13, using vxworks5.4 version. The prototype includes driver debugging, EVG/EVR-230 experimental new features such as CML output signals using high-frequency step size of the signal cycle delay, the use of interlocking modules, CML, and TTL's Output to achieve interconnection function, and data transmission functions
[en] RF Protection Interlock (RFPI) system has been developed for the protection of high power RF components in LEHIPA. The system consists of six VME64X based modules which processes output of different sensors. The system is designed based on a mezzanine card approach with a common base board and all the function specific boards are mounted on the mezzanine board. After detecting any fault, time required for RFPI system to switch off RF power in the cavities is less than 1μs.This paper describes the sensors used in RF protection Interlock System and the important features of the system. (author)
[en] The present study carries on the characterization of dry reinforcement structure for composite material. Yarn properties were analyzed to select the optimal level of twist. The influence of 3D-warp interlock structure’s bending type was also investigated. Structures, made with 1000Tex flax roving, were woven on a dobby loom. Physical characterization and mechanical testing (tensile test) were conducted on the four different binding structures (AL, AT, OL and OT) to provide relevant data and identify the influence of the binding warp yarns’ path inside 3D warp interlock structure. (paper)
[en] The COMPASS tokamak has started its operation recently at the Institute of Plasma Physics AS CR in Prague, Czech Republic. An important issue of the operation is the interlock system, which secures the safety of the personnel. The personnel protection is based on a restricted access into the experimental hall during the tokamak operation. An experimental hall access system, based on Honeywell WIN-PAKTM2005, allows to set the status of the experimental area and to control the movement of the personnel. A hardware interlock, based on a PLC MicroPEL M66, interprets the experimental hall status and controls the safety of the operation of key systems accordingly. The permit for operation is granted and the real status of the systems is reported by hard-wired potential-less contacts. The PLC provides a HW interface between Actuators (relays and switches) and it is connected on PESNET bus. Second site of personnel protection system is created on a PC where runs a .NET application on MS Windows XP. This PC is connected with PLC via PESNET bus (on RS485 layer) and it creates an operator interface. Details of the set-up are described in this contribution.
[en] High availability interlocks and controls are required for the ILC (International Linear Collider) L-Band high power RF stations. A new F3 (Fast Fault Finder) VME module has been developed to process both fast and slow interlocks using FPGA logic to detect the interlock trip excursions. This combination eliminates the need for separate PLC (Programmable Logic Controller) control of slow interlocks. Modules are chained together to accommodate as many inputs as needed. In the next phase of development the F3's will be ported to the new industry standard ATCA (Advanced Telecom Computing Architecture) crate (shelf) via a specially designed VME adapter module with IPMI (Intelligent Platform Management Interface). The goal is to demonstrate auto-failover and hot-swap for future partially redundant systems.