or self alignment and self assembly

... transformer modeling, and loss mechanisms in high-frequency power magnetics (Chapter 12) An understanding of what determines the size of power inductors and transformers Power inductor and transformer ... waveforms A1.1 Some common waveforms A1.2 General piecewise waveform Appendix Magnetics design tables A2.1 Pot core data A2.2 EE core data A2.3 EC core data A2.4 ETD core data A2.5 PQ core data ... margin and closed-loop damping factor 9.4.3 Transient response vs damping factor 9.5 Regulator design 9.5.1 Lead (PD) compensator 9.5.2 Lag (PI) compensator 9.5.3 Combined (PID) compensator 9.5.4...

Ngày tải lên: 13/12/2013, 01:15

... This is based on existing design, for example, standard products or systems adopted for a new application Conveyor belts, control system of machines and mechanisms or haulage systems are some of ... innovation and development Reliability and safety Reliability is an important factor in any design A designed machine should work effectively and reliably The probability that an element or a machine ... machines receive mechanical energy and modify it so that a specific task is carried out, for example a hoist, a bicycle or a handwinch This modification or transformation of energy requires a number...

Ngày tải lên: 17/12/2013, 11:15

... compressive, bearing and shear stresses Flexture formula and their limitations Torsion formula and its limitations Design of members subjected to combined bending, torsion and axial loading Buckling ... the same for both the solid and hollow shafts, we may write from torsion formula τAl J Al = τSt JSt and τAl G Al = τSt G St where τ, J and G are shear stress, polar moment of inertia and modulus ... slide against section 1243 and this is repeated in subsequent layers This would cause interplanar shear forces F1 and F2 at the faces A1 and C2 and since the F = ∫ σ x dA force at any cross-section...

Ngày tải lên: 17/12/2013, 11:15

... shafts for torque transmission in varied applications It may be to connect two units such as a motor and a generator or it may be to form a long line shaft by connecting shafts of standard lengths ... sleeve coupling Normally sunk keys are used and in order to transmit the torque safely it is important to design the sleeve and the key properly The key design is usually based on shear and bearing ... proportions in terms of shaft diameter d for these couplings are: d0 = 1.5d, L = 3d and a = 0.75d The mean pin diameter dmean = 0.2 to 0.25 d For small couplings dmean is taken as 0.25d and for...

Ngày tải lên: 23/01/2014, 04:20

... equation is further modified by considering the shear correction factor, Ks and Wahl correction factor, Kw It is a normal practice to multiply τm by Ks and to multiply τa by Kw Kτ K τ 2τ = s m + w a ... co-ordinate of the point a is τe τe , For safe 2 design, the design data for the mean and average stresses, τa and τm respectively, should be below the line a-b If we choose a value of factor ... stress or the average stress We know that for varying stress, the material can withstand stress not exceeding endurance limit value Hence, for repeated torsion experiment, the mean stress and the...

Ngày tải lên: 23/01/2014, 04:20

... the mean stress and stress amplitude for all the loads, namely, axial, bending and torsion Thereafter, any of the design methods for variable load, that is, Soderberg, Goodman or Gerber criteria ... lateral deflection of the shaft and /or angle of twist of the shaft should be within some prescribed limit Therefore, design for stiffness is based on lateral stiffness and torsional rigidity Version ... static stress Therefore, the problem is treated as a design for static loads Here, σe or τe are equivalent to allowable σy τy stress, or Hereafter, conventional failure theories can be used to...

Ngày tải lên: 23/01/2014, 05:20

... Stresses developed in thin cylinders • Formulations for circumferential and longitudinal stresses in thin cylinders • Basic design principles • Joint design; Welded or Riveted 9.1.1 Stresses in thin ... we may write pπr2 = σz π (ro2-ri2) where ri and ro are internal and external radii of the vessel and since ri≈ ro = r ro – ri = t we have σz = (say) and t r σz θ p P dθ σθ σθ (a) (b) 9.1.1.2F- ... thickness for the cylinder body and 10mm thick plate for the hemispherical end cover The cover plate thickness may be taken as 0.625tc i.e 12.5 mm The hoop stress is now given by σθ = pr = 50MPa and...

Ngày tải lên: 23/01/2014, 05:20

Ngày tải lên: 27/06/2014, 05:20

... can be stored on a range of different media CDs and DVDs are relatively cheap ways of storing, sending and viewing digital information Memory sticks or pen drives are a highly portable and reusable ... scalability This format is used for corporate logos as they are easily portable and self- contained, which means they cannot be altered from within desktop publishing programs Format Advantages ... can be manipulated and formed during print finishing including folding, die-cutting and perforating to produce specific formats or decorative effects Hans van Bentem (above and right) This combination...

Ngày tải lên: 01/07/2014, 10:43

Ngày tải lên: 10/08/2014, 11:21

Ngày tải lên: 10/08/2014, 11:22

Ngày tải lên: 10/08/2014, 11:22

... Stator S Rotor bs N Rotor S Stator as N as bs Stator S Rotor Assymetrical Geometry N as as bs Stator Stator S Rotor bs N Rotor S Stator as N as bs Stator S Rotor bs N Rotor S Stator Figure 3.2.1 ... common property or characteristic Let A stands for actuators, B stands for sensors, and C stands for translational motion microstructure Then, the region ABC represents actuators and sensors which ... actuators have higher power, torque and force densities, superior efficiency and performance compared with translational actuators However, in many applications the translational actuators and...

Ngày tải lên: 17/10/2013, 11:15

... evolution, and organization; • adaptive decision making, • coordination and autonomy of multi-node NEMS and MEMS through tasks and functions generation, organization and decomposition, • performance ... into simpler subproblems and subtasks which are easy to understand, support, and implement using the state table of rules (for each rule, the actuator or sensor action and operation are determined ... architecture for large-scale multi-node NEMS and MEMS Different operating systems, interfaces, and platforms should be supported by advanced software, and there is a critical need for novel high-performance...

Ngày tải lên: 19/10/2013, 18:15

... two-phase induction motors, we model the stator and rotor circuitry dynamics As the control and state variables we use the voltages applied to the stator (as and bs) and rotor (ar and br) windings, ... dψ qdor u 'qdor = K r rr' K r 1i qdor + K r ψ qdor + K r K r (3.4.21) dt dt The matrices of the stator and rotor resistances rs and rr' are diagonal, − u qdos = K s rs K s 1i qdos + K s and hence, ... Reference Frame The abc stator and rotor variables must be transformed to the quadrature, direct, and zero quantities To transform the machine (abc) stator voltages, currents, and flux linkages to the...

Ngày tải lên: 19/10/2013, 18:15

... }n for expressing a given vector v is unique Let U and V be two vector spaces of dimensions m and n, respectively, and L a linear transformation of U into V, and define bases BU and BV for U and ... with VAL-II The Utah/MIT hand is mounted on the end-effector of the arm The system integrates force and position sensors with control commands for both the arm and the hand To demonstrate the effectiveness ... quantities such as distances and angles between lines Although we may resort to a coordinate frame and vector algebra to compute distances and angles and represent vectors in that frame, the final...

Ngày tải lên: 19/01/2014, 18:20