MRKT - Real-World Write-ups Article Example | Topics and Well Written Essays - 250 words

MRKT - Real-World Write-ups - Article Example 2). The trend in fashion was exemplified by Liberty, a UK based retailer of clothes, in terms of organizing groups of clientele who endeavor to learn on crafts such as knitting and sewing, among others. The same strategy was reported to be applied by Nike, as the company organized sports activities in various community groups that share the same interests. In doing so, the strategy of highlighting shopping as a social activity is reinforced. The value of conversation and effective communication to clients was enhanced by Pizza Express through hiring â€Å"actor Karl James to teach its staff how to better interact with diners† (ibid, par. 17). In addition, retail shops realized the need to retain front line personnel whose role includes persuasion in the sales process. Finally, as stated, â€Å"pop-ups, temporary shops often in unusual spaces, whose lifespan can range from just a couple of hours to a few weeks, are helping to bring some spontaneity and excitement to retailingà ¢â‚¬  (ibid, par. 26).

Electrical Rotary Actuators Essay Example | Topics and Well Written Essays - 2000 words

Electrical Rotary Actuators - Essay Example Actuators are devices used for driving various types of objects to obtain a desired amount of displacement. This displacement may be of a linear or rotary nature. The driving force of an actuator may be generated by either an electrical, hydraulic or pneumatic input. The rotary actuators discussed here, are concerned with applications where a rotary displacement with a desired angle of rotation is required, and use electrical energy to generate the driving force. Construction: The basic components of an electric rotary actuator are a motor and a reduction gearbox mechanism. Electric rotary actuators drive components rotationally via electromagnetic power from a motor. The reduction gear translates the speed and torque of the motor to the required scale. Suitable damping and spring return mechanisms are also built in. The rotational element can either be a shaft or a table. Circular shafts often include keyways, while tables provide a bolting pattern to mount other components. They usually provide control and indexing capabilities to allow multiple position stops along strokes. Other auxiliary components include return springs, seals, limit switches for both ends of rotation span, etc. A simple rotary actuator model using a DC motor is considered for the study and analysis of the device. The DC motor directly provides a rotary motion. For practical application, this rotary displacement is transmitted into suitable transitional motion by attaching an output coupling mechanism, consisting of wheels or drums and cables. The figure 1 shows the electrical circuit of the armature, and the free body diagram of the rotor of the DC motor.Electrical circuit of Armature Free body diagram of rotor Figure 1. In the electrical circuit of the armature, the resistance of the armature coil is represented by R in ohms, and the inductance is presented by L in henrys. The input source is shown as a voltage V. The back EMF produced, is shown as a voltage source, which opposes the input source. For the rotor free body diagram, the torque developed is T and rotation angle is . The effect of the moment of inertia of the rotor and damping method employed is also taken into the account. The damping is provided to avoid large overshoots of the rotational displacement. For the purpose of sample study, the following values of other parameters are initially assumed as: 1. Moment of Inertia of the rotor, ( J ) = 3.2284E-6 kg m^2 / s^2. 2. Damping ratio of the mechanical system, ( b ) = 3.5077E-6 Nms 3.