We present a method for implementing “steadyhand control” on teleoperators where the master device is of the impedance type. Typical steady-hand systems are admittance controlled cooperative robots that can implement very high damping. Such systems are ideal for implementing guidance virtual fixtures, which are constraints in software that assist a user in moving a tool along preferred paths. O...

This paper presents the characterization of illuminated high-frequency active devices using a time domain physical simulation model. The model is based on Boltztnann’s Transport Equation (BTE), which accurately accounts for carrier transport in microwave and millimeter wave devices with sub-micrometer gate lengths. Illumination effects are accommodated in the model to represent camer density ch...

Input current distortion in the vicinity of input voltage zero crossing of Boost single-phase active power factor corrected rectifier in high line frequency is studied based on one cycle control method in this paper. The current loop model and input admittance model of active power correction based on one cycle control is particularly analyzed. The results point out that its equivalent power st...

Active network synthesis is important for circuit designer to find new circuits with desired performance. In this paper, a method of Tow-Thomas (TT) Bi-quad band-pass filter circuit generation methods is proposed using nullor representation of the operational amplifier (OPA), and a method for synthesizing active band-stop filters is presented, both of which start from voltage transfer function ...

The occurrence of food safety incidents such as “Sanlu Milk Powder” make the public have doubts about the effectiveness of food quality safety market admittance system. Therefore, studying and evaluating the effectiveness of food quality safety market admittance system has become a problem to solve urgently. The article combines the theory of management science with the practice of food quality...

In this paper, two admittance based control schemes for a power assisted lifting device are presented. This device can be used to hoist a heavy object interactively for reducing the operator's burden. The proposed system integrates an admittance controller with an inner control loop that regulates the velocity of the object. The admittance is the outer loop that establishes the desired relation...

The formulation of the wall admittance of a circular microstrip antenna by the spectral domain method is presented. The circular microstrip antenna is calculated using the cavity model. The electromagnetic fields within the antenna cavity are determined from the impedance boundary condition at the side aperture. The contribution from the region outside the antenna is taken into account by the w...

‘J’his paper addresses the problem of controlling a mani]mlator in compliant motion while in contact with an environment having an unknown stiffness. Admittance control is used as an czplzczt force control sc}]eme in which a force setpoint is specified and is tracked by the force compensator. Two adaptive PID and 1>1 force colnpcnsators arc propcrscd. The compensators ensure robust tracking of ...

OBJECTIVE Identify and establish risk factors associated with mortality secondary to upper gastrointestinal bleeding up to 30 days after the episode, at the Hospital Nacional Cayetano Heredia. MATERIAL AND METHODS A retrospective analytic observational case-control study was made with a case: control proportion of 1:3, analyzing 180 patient from which 135 were the controls and 45 the cases. I...

The potential instability issues caused by the dynamic interactions between parallel grid-forming inverters are examined. approach adopted for analysis is s-domain admittance-based eigenvalue and mode shape analysis. This admittance based on a five-node circuit diagram after conversion of each electric element inverter control unit into impedance models. Eigenvalue results show that unstable re...