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Digital and Mixed Analogue/Digital Simulations
Published in Bashir Al-Hashimi, The Art of Simulation Using PSpice: Analog and Digital, 2019
PSpice supports edge-triggered flip-flops and latches. There are two types of edge-triggered flip-flops: the J-K, which is negative edge triggered, and the D-type, which is positive edge triggered (see Table 9.1). There are two types of latches: the S-R and the D-type. Only the edge-triggered D-type flip-flop will be considered here. The basic form of the D-type flip-flop digital primitive device description statement is U<name> DFF <no. of flip-flopsx$D_DPWR> <$D_DGND> + <presetbar node> <clearbar node> <clock node> + <D node 1 >…<D node n> + <Q output 2>..<Q output n> + <Qbar output l>..<Qbar output n> + Ktiming model name> <I/0 model name>
Clarify the Tradeoff behind a Problem
Published in Rantanen Kalevi, Conley David W., Domb Ellen R., Simplified TRIZ, 2017
Rantanen Kalevi, Conley David W., Domb Ellen R.
Latches of this kind work well on garden gates. However, when the same mechanism is used on a big ship, a problem appears. The vessel is constantly moving. Parts of the latch wear and may even fracture. In 1994, the ferry Estonia sank in the Baltic Sea and 852 persons lost their lives. The investigating commission found that the reason for the disaster was failure of a locking mechanism. As a result, a so-called visor was lost, water accumulated on the car deck, and the vessel capsized. (A “visor” on a ship is a type of gate that resembles the visor in a motorcyclist’s helmet.)
Concept Descriptions for the VTR Rabbit System and Driver Fuel Test Assemblies
Published in Nuclear Science and Engineering, 2023
Sean M. McDeavitt, David Wootan, Mark Kimber, Karen Vierow Kirkland, Luis H. Ortega, Delia Perez-Nunez, Pavel Tsvetkov, Jason Hearne, Abdullah Weiss, Saleem Drera, Nicolas E. Woolstenhulme
The upper shield block has a central hole to enable extraction of the insert through a normal upper handling socket. An innovative collet-lifting latching mechanism ensures that the insert remains latched during operation. A fully captured spring-plunger pushes lever arms out to latch the insert into grooves in the upper shield block. All moving parts are captured by robust features that are intrinsic or welded. Selection of proper materials and the relatively low fluence in this upper area will enable the spring to retain adequate properties. The latches are designed so that upward-acting flow forces tend to engage the latches more firmly. Design clearances are large enough to help mitigate self-welding phenomena and facilitate insert extraction following irradiation. Some amount of “sticking” is likely to occur at the interface between the latches and the upper shield block but is not viewed as detrimental as long as it can be freed during the extraction evolution. See Fig. 14 for renderings of the current design concept.
Utilization of acoustic signals with generative Gaussian and autoencoder modeling for condition-based maintenance of injection moulds
Published in International Journal of Computer Integrated Manufacturing, 2022
G. Ø Rønsch, I. López-Espejo, D. Michelsanti, Y. Xie, P. Popovski, Z.-H. Tan
The latch lock on a mould (see illustration in Figure 5) is exposed to a large force when the mould is opened and closed. There is therefore a risk that the latch-lock head becomes loose and breaks off over time. To simulate this in a controlled way, the following procedure was carried out for the three worn-out moulds used: A baseline of approximately 50 moulding cycles was recorded (denoted as “faultless”).The socket screw holding the head of the latch lock was loosened 0.01 mm.Fifty moulding cycles were recorded, and the resulting gap of the latch-lock head was measured.Step 3 was repeated until it was evaluated that further cycles would break off the latch-lock head (gap of 1.5 to 2.0 mm). The last (approximately) 50 cycles were denoted as “faulty”.
Enhancement of mechanical and tribological properties of SiC- and CB-reinforced aluminium 7075 hybrid composites through friction stir processing
Published in Advanced Composite Materials, 2019
Pratip Roy, Subhash Singh, Kaushik Pal
There is an expanding enthusiasm for the uses of the ultrafine-grained auxiliary castings of aluminium alloys in the aviation and automobile sectors. The substitution of mechanically affixed amassed components by huge, unpredictable, single piece casting enhances fatigue life of that component and also diminishes the structural weight, because of the end of fastener and latch openings. Grain refinement plays significant role for improving the fatigue life and mechanical properties of aluminium alloys [8]. Initially, the microstructure of as-cast aluminium alloys reinforced with SiC and CB analysed as shown in the Figure 3 . Affirmed dendritic solidification is seen in AA7075/SiC/CB composite when contrasted with as cast AA7075 and AA7075/SiC composites. Further, it is observed from the microstructural investigation of all the composites concentrated in this study, grain size lessened dynamically from as-cast composites to SiC reinforced and SiC/CB reinforced composites as depicted in Figure 3 (d) and (f). The grain size decreased progressively with the addition of ceramic phases in AA7075. In this manner, the solute concentration effect as grain refinement is obvious. De-agglomeration and proper distribution of SiC and CB particles in AA7075 matrix are expected to result in enhanced mechanical properties and increased density of the castings, resulting for fine microstructure.