In the present paper, the exact modeling and frequency analysis of the mass Sensor nanobeam are investigated based on a higher-order elasticity theory with taking into account the longitudinal discontinuity. The energy equations of the beam are expressed considering discontinuity, and finally, the Vibration equations and boundary conditions of the Non-uniform nanobeam are derived using Hamilton’s principle. By the implementation of an analytical solution, the number of shape functions equal to longitudinal discontinuities is assumed. Then, by expressing the compatibility and boundary conditions, the frequency equation of the discontinuous nanobeam is obtained and solved. Effects of different parameters such as sensed mass and size effects on the frequency behavior of the nanobeam are investigated at various Vibrational modes. The results show that accurate modeling of discontinuous nanobeam is important. Also, Changing the position of the sensed mass to the free end of the nanotube increases the sensing feature of the beam, and the size effect reduces it. The size effect reduces the frequency and increases the amplitude of the mode shape, especially at higher Vibrational modes. The results also show that the sensing feature of the mass Sensor nanobeam is more prominent at higher modes of Vibration, and therefore the use of mass Sensor nanobeam at higher Vibrational modes is recommended.

This paper proposes a Non-contact system to measure electrical current crossing a wire. To do so, the design and simulation of a piezoelectric cantilever beam with a tip mass are presented using mathematical modeling. The sandwich cantilever beam is composed of two piezoelectric layers and a mid-layer made up of steel. For mathematical modeling, the governing differential equation of the beam is extracted and solved by the Galerkin method. Then the output voltage is calculated for different values of external forces. The force applied to the tip mass from the magnetic fi eld of wire is used as the external excitation force of the beam. According to the response of the output voltage, the current crossing the wire is calculated. Validation of the model is demonstrated compared to other references. In the results section, frequency response behavior and the infl uence of the geometric parameters on output voltage are analyzed. Appropriate values of these parameters should be used in the design process of this Non-contact Sensor to have an observable applied force from the current-carrying wire.

Wheel/rail contact simulation is one of the most complicated problems in the modeling of railway vehicles. The wheel/rail interaction plays a unique role in rail vehicle dynamics. In this paper, the dynamic response of the wheel on irregular rail track is analyzed with analytical approach using the method of Multiple Scales (MMS). The Hertzian contact theory is used to obtain the relationship between normal contact force and the displacement of the mass center of the wheel. Analytical approach is expanded for performance of train’s wheel travelling on the rail. To validate the method presented in this paper, responses of the model using MMS method are compared with the results obtained from the Runge-Kutta numerical solution. Finally effects of the wheelset preload on response frequency have been studied.

Many robots were installed in the manufacturing industry in the last decade. This shows the importance and value of the robot system in production. But many robots are not collaborative with humans. Collision detection is a fundamental issue for the safety of a robotic cell. All existing collision detection Sensors are worked by opposing force (contact between robot and human) and it is injurious to humans due to the high collision force response of the robot at maximum speed. This research work demonstrates the use of the capacitive Sensor for collision detection and the experiment shows the collision avoiding by Non – contact manner. The Sensors are mounted on the links of the robot. If the robot comes closer to humans, the capacitive Sensor will detect the human presence and send the signal to the robot controller before the robot touches the human. The controller will turn off or hold the robot in position immediately based on the Sensor signal. So this technique will ensure human safety more and more when compared to the current robot system. This Sensor can be installed on a new robot and retrofitted to the old robot.

The personalized local mobile search aims at finding the right on the spot information that is most relevant to the user's requests. It is implemented as a mobile application where the user can access nearby places based on his/ her current location. In Today's technology driven world user profiles are the virtual representation of each user and they include a variety of user information such as personal, interest and preference data. These profiles are the outcome of the user profiling process and they are essential to service personalization. The user profile based personalization approach can be applied to enhance the power of mobile local search for local spots and contributes to a significant convenience in location-based mobile searching. The system takes the user information such as personal, health, entertainment and choice of preference and these parameters are passed to Google Maps API key for personalized query processing. As a result, the user will get prominent services rather than closing one.

vIn this paper, a simulation-based method is proposed for optimal placement of Vibration Sensors for the purpose of fault detection in a centrifugal pump. The centrifugal pump was modeled to investigate the effect of vane tip fault on fluid flow patterns numerically. Pressure pulsations were investigated at different locations at the inner surface of the pump before and after the presence of the fault to determine the best location for installing Vibration Sensors on the pump casing. Experiments were also conducted by mounting accelerometers at various locations on the pump casing. Simulation and experimental results were then compared and a direct correlation between changes in PSD amplitudes of pressure and acceleration signals was observed. The optimum location for placement of an accelerometer was determined to be near the volute tongue on the casing where the highest level of pressure pulsations in the simulation was also calculated in the presence of vane tip fault.