Papers by Keyword: Feedback

Abstract: This paper proposes to use Routh-Hurwitz stability criterion for analysis and design of the operational amplifier stability; this can lead to explicit stability condition derivation for operational amplifier circuit parameters, and this is very effective to understand which parameter values should be increased or decreased for the operational amplifier stability. The proposed method has been verified by three amplifiers with theoretical analysis and SPICE simulations for three operational amplifier examples.

Abstract: This paper aims to introduce an innovative integrated online feedback tool to gather user-generated information from the online visitors of a company’s website. In this particular example, are presented the benefits of adopting such a tool in the case of an IT company. As growth can be obtained only through customer satisfaction, this tool would enable the Company’s decision-makers to have real-time access to information on their clients’ feedback. With the help of the online reviews, a new kind of marketing and communication emerged, that helps filling the gap between the old traditional review to a viral form of feedback that can increase exponentially the value of a business. Online reviews are one of the biggest aspects for any business that wants to take control and keep a good online reputation. Reviewing has entirely changed the face of the online marketing since the Internet caused a revolution in selling. Reviewing allows businesses to be active and positive regarding the participation of the consumers, and gives them a solid foundation for creating a relationship between the consumer and the business

Abstract: To suppress the abrupt and unexpected turning velocity fluctuation of the industrial robot under the condition of trajectory tracking, a flexible robotic joint experimental setup with the harmonic drive was established. The measured friction with Stribeck effect and velocity were modeled by a simple polynomial fit method. Two friction compensation control strategies of feedforward and feedback were designed. The friction compensation experiments were carried out on the dSPACE system, the good restraint effect of fluctuation on the turning velocity was verified and the control accuracy of feedback compensation control strategy proved better.

Abstract: For existing disadvantage in gear measuring instruments, such as single measure, complex operation, expensive, and so on, in the paper primary and secondary coordinate system are established based on the theoretic of positioning coordinates and gear, then the introduction of feedback measuring device can be integrated in the design of a manufacturing new gear during the measurement center.

Abstract: This paper presents the design and construction of a haptic device. This device aims to generate a tactile feedback to the user. The feedback is generated when the user has contact with virtual limits (through a graphical interfaces or electronic cards). These limits could be due to speeding or recklessness from the pilot under conditions of low visibility or turbulence. The paper begin with the design of the lever-shaped cam which has two Degree of Freedom (DOF). It proceeds with the kinematic analysis to obtain the work area. As of workspace is possible to determine the contact point with the geometry of the virtual object. In this event the user will have a tactile feedback, a force or vibration. This force must be minimal, to prevent injury to the user.

Abstract: As one of the most important parameters of Direct Current (DC) power supply, Load regulation determines the performance of whole system. In this paper, the internal structure as well as performance parameters of LM2577 boosting converter were deeply investigated and based on this investigation we proposed two new methods of improving its Load Regulation. One method (method 1) is to replace the resistor connected to the feedback pin of LM2577 with a programmable potentiometer and sample the variation of output voltage using an AD converter. The potentiometer is adjusted under the control of feedback algorithm to keep the output voltage stable, thus the load regulation enhanced. In the other method (method 2), the feedback pin of LM2577 is connected to an adder to stabilize the output voltage of DC power supply and increase the load regulation. A voltage divider made up of resistors divides the output voltage and provide the divided voltage to one input of the adder. The other adder input comes from DA converter controlled by microcontroller. To reduce the adjust time and increase the efficiency, PID algorithm is applied in the software part of the system. We use 12-bit AD (ADS1115), 12-bit DA (TLV 5638) and 10-bit programmable potentiometer (AD5293) to test the methods above under the condition of 5V input voltage and 600mA load current. When output is set to 7V, the load regulation is improved from 1.043%, the rate from application circuit in LM2577’s Datasheet, to 0.700% and 0.042% by applying the first and second method, respectively. When output voltage equals 12V, the improvement is from 0.658% to 0.008% and 0.008%. Meanwhile, the method 2 suppresses output voltage ripple to be less than 10mV.

Abstract: There are some problems existing in open loop system with stepping motor as driving motor, such as lower servo precision, without compensation for step losing of stepping motor and so on. This paper presented a new approach called quasi-close loop control. With the help of the method, the control accuracy will be similar to that of close loop system and can be obtained, and the system will have the same stability as that of open loop system. With MCS-51 single-chip microcomputer as control unit and grating scales for measuring displacement, a quasi-close loop control system was built on NC lathe. The practice shows that the quasi-close loop control system has advantages such as high control accuracy, good stability and high cost performance. It is suited to economical NC machine tools and has wide application prospects.

Abstract: This paper presents a coordinating steering control method in an Electric Vehicle with Four-in-Wheel-Motors Drive and Four-Wheel Independent Steering. This control method applied a PID compensation to solve the absonant steering problem. This research builds a mathematic model for the control system and uses the Matlab simulation to verify the feasibility and control effect. Then it is applied in a real car environment for further experiment in which the paper studies the control effect with varied control parameters. According to the analysis of the experiment, a practical solution for steering System is proposed with excellent control effect.

Abstract: Detecting and merging approximately duplicate records is not an emerging issue in the field of data cleansing, the majority of duplicated records detecting method is based on the "sort-merge" thinking. Although clustering methods have been applied to data cleaning, a large number of non-duplicated records exist in clusters after analysis as a result of the increasing records. Response to this shortcoming, this paper presents a data cleansing method based on Clustering Feedback Pattern. Comparison results of clustering are fed back to the cluster process so that recall and precision improve.

Abstract: In order to fix the defects of the inaccurate control parameters in concrete intelligent mixing, this paper proposes a concrete mixing parameter control method based on fuzzy neural network PID control algorithm. The control method mainly includes two parts-control parameter calculation and mixing data feedback. According to the control parameter calculation, the proposed method is capable of calculating the control parameters required to control the concrete mixing. The industrial concrete mixing condition can be feedback to the control end via data feedback method. The control parameters can be adjusted according to the feedback data to accurately control the concrete mixing. The experimental results illustrate the proposed algorithm can effectively increase the control accuracy with satisfactory performance.