The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Ultrasonic vibration assisted machining is known to reduce friction forces for various processes and materials. In this paper, the friction forces between an asymmetrical cutting blade and sheet stack for different cutting velocities are investigated. Materials used for the sheets are plain label paper and polyethylene terephthalate. The cutting blade operates at a resonant longitudinal mode, resulting...
Engineering instructors seek to gauge the effectiveness of their instruction. One gauge has been to use standardized tests, such as concept inventories and to quantify learning as the change in score over the semester. Here we question whether that approach is always the best practice for gauging the effect of instruction, and we propose an alternative of administering different tests at the start...
For getting high quality air holder part, its' shape and demand are analysised, then determining the technology route, each procedure's extension size and the relative force are calculated, then the assemble of dies could be obtained. Thus CAD/CAE technology could reduce dies' design time and cost.
This paper introduces a novel climbing robot with high maneuverability for inspection of ferromagnetic 3D human made structures. The robot takes advantage of novelties which allows an excellent maneuverability on the structure and can adapt to flat and non-flat structures. In this paper we present the conceptual and detailed design of the robot, the implementation and two tests: laboratory tests on...
An overview of current limitations and challenges with techniques, based either on acoustic or thermal perturbation, providing charge density profiles within insulations, is presented. Even though the resolution could be somewhat improved, technical limitations readily appear, related to the bandwidth of signals to be detected and to the sensitivity. Instead, our purpose here is to exploit near field...
Humans exhibit exceptional skills in using tools and manipulating objects of their environment by skillfully controlling exerted force and arm impedance. One of the basic components of this mechanism is the generation of internal models which associate kinematic variables with applied force. On the other hand, making robots capable of skillfully using tools and adapting their motor behavior to new...
In order to study how the Blank Holder Force (BHF), Die Radius and Drawbead (with or without) affect the stamping performance, this paper takes the automobile oil pan as the example, simulates the drawing procedure on Dynaform. And then analyzes the FLD (Forming Limit Diagram), Thickness or thinning figure and forming results. Finally, we get the optimal BHF and die radius.
Nanostructural superconducting MgB2-based materials contain a great quantity of O, which gives grounds to assign them to Mg-B-O compounds. The quantity of O in these materials is not an obstacle for attaining high critical current density (jc=106 A/cm2 in 1 T at 20 K), upper critical magnetic fields (Bc2(0 K)= 42 T, Bc2(22 K)= 15 T) and the fields of irreversibility (Bρ(0 K)= 32.5 T, Bρ(18.5 K)= 15...
Contact materials based on copper-chromium (CuCr) are widely used in vacuum interrupters for medium voltage applications. Copper-chromium materials with a chromium content between 25 and up to 50 wt.% are selected for the majority of vacuum interrupter applications. For short circuit current making and breaking operations in particular, the material used in the majority of transverse magnetic field...
Wear of cutting tool in the most of cases occurs on the tool flank and causes increasing of cutting force which results aggravation quality of processed surface and accuracy, destruction of tool. Knowledge of distribution of contact load on the wear chamfer of tool flank is used for analysis of stressed state, calculation of strength and rational use of cutting tools. Experimental and theoretical...
Ion implantation is a promising method of increasing the tool lifetime. The process of high-energy rays can significantly change the contact surface condition and the adhesive contact of chip with the tool. In this paper we consider the influence of ion implantation on the process of chip formation and the stressstrain state of the cutting tool. The object of study is coated carbide insert with TiN...
The gas dust removal process in filters is achieved in the formed filtered particles layer, which thickens and becomes denser. In the gas filtering process through the porous diaphragm the precipitated dust is located in agglomerated state. Layer packing with particles accumulation is connected with the aggregates reformation. A layer porosity and particles calculated diameter are variable quantities...
Atomistic coarse grained parameters were calculated from a non-equilibrium molecular dynamics simulation of the separation of an epoxy-copper interface. The methodology to determine the interaction energy and the equilibrium distance between the interfacial materials at a minimum energy is established. The traction-displacement relations of the separation under the influence of time taken for atomic...
This paper proposes a magnetic actuator of a new type that exhibits a very high thrusting force and is capable of a reversible motion in a complex pipe. The magnetic actuator of the reversible type due to opening and closing of a compound material by using elongation and contraction of four shape-memory-alloy (SMA) coils was fabricated. The magnetic actuator moves by difference in frictional force...
Transmission on-off valve is an important component in the aircraft fuel system. It is directly related to the fuel supply security during the flight. Erosive wear is the main form of transmission on-off valve failure. it is said that Mathematical modeling of the dynamic characteristics of hydro-mechanical shut-off valves in typical aircraft fuel system, and the failure to model caused by Erosive...
Magnetically controlled shape memory alloy (MSMA) can change its shape when it is exposed to a magnetic field, which provides a new way to produce linear motion and force. The MSMA material has another property yet: the MSMA material can change its magnetic property when it is subjected to mechanical force, which is known as inverse characteristics of MSMA. In this paper, a testing device which is...
This paper is based on achieving a tensile testing machine, whose control is to be carried out in a NI Software. A big plus is that it offers us the possibility of total customization according to our needs, and besides that realizing its control by yourself, you can obtain a much lower price than those on the market.
Technology integrated innovation is realized by integrating the useful features of two or more technologies to improve one technology or create a new product. The method for technology integrated innovation is discussed. Referring to gene recombination, the conception of technology basis recombination is put forward. A design process model for technology integrated innovation based on technology basis...
Through integrated analysis to the weapon materiel support elements of information flow, material flow, personnel flow and capital flow, this paper formed the civil-military integrated weapon materiel support system based on network and information. Civil-military integrated weapon materiel support operation mechanism is established through the aspects of management operation, support mobilization,...
According to the problems and difficulty of high-tech equipment M&S, the shortcomings of existing equipment maintenance & support (M&S) mode are analyzed in this paper. The new mode of high-tech equipment M&S is presented from innovating M&S mechanisms, improving maintenance means and the material supply & inventory system, optimizing the personnel training system and other...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.