scholarly journals Closed-loop tracking of amplitude and frequency in a mode-localized resonant MEMS sensor

2017 ◽  
Author(s):  
Milind Pandit ◽  
Chun Zhao ◽  
Guillermo Sobreviela ◽  
Aref Mustafazade ◽  
Ashwin A Seshia
Keyword(s):  
Closed Loop ◽  
Mems Sensor

scholarly journals Closed-Loop Characterization of Noise and Stability in a Mode-Localized Resonant MEMS Sensor

2019 ◽  
Vol 66 (1) ◽  
pp. 170-180 ◽  
Author(s):  
Milind Pandit ◽  
Chun Zhao ◽  
Guillermo Sobreviela ◽  
Arif Mustafazade ◽  
Sijun Du ◽  
...  
Keyword(s):  
Closed Loop ◽  
Mems Sensor

scholarly journals Research on Decomposition of Offset in MEMS Capacitive Accelerometer

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1000
Author(s):  
Xianshan Dong ◽  
Yun Huang ◽  
Ping Lai ◽  
Qinwen Huang ◽  
Wei Su ◽  
...  
Keyword(s):  
Decomposition Method ◽  
Closed Loop ◽  
Capacitive Accelerometer ◽  
Mems Sensor

In a MEMS capacitive accelerometer, there is an offset due to mechanical and electrical factors, and the offset would deteriorate the performance of the accelerometer. Reducing the offset from mechanism would benefit the improvement in performance. Yet, the compositions of the offset are complex and mix together, so it is difficult to decompose the offset to provide guidance for the reduction. In this work, a decomposition method of offset in a MEMS capacitive accelerometer was proposed. The compositions of the offset were first analyzed quantitatively, and methods of measuring key parameters were developed. Based on our proposed decomposition method, the experiment of offset decomposition with a closed-loop MEMS capacitive accelerometer was carried out. The results showed that the offset successfully decomposed, and the major source was from the fabricated gap mismatch in the MEMS sensor. This work provides a new way for analyzing the offset in a MEMS capacitive accelerometer, and it is helpful for purposefully taking steps to reduce the offset and improve accelerometer performance.

MEMS Sensor Network Based Anti-Sway Control System for Articulated Hydraulic Crane

2013 ◽  
Author(s):  
Janne Honkakorpi ◽  
Juho Vihonen ◽  
Jouni Mattila
Keyword(s):  
Control System ◽  
Angular Velocity ◽  
Control Systems ◽  
Sensor Network ◽  
Closed Loop ◽  
Angular Rate ◽  
Suspended Load ◽  
Velocity Estimation ◽  
Mems Sensor ◽  
Load Swing

Hydraulic articulated multi-joint crane systems are widely used for the transportation of heavy loads. High productivity requires a short cargo transportation time which can lead to undesirable oscillations during crane load acceleration and deceleration. Typically it is the task of a crane operator to suppress the load swing, but with ever-increasing demand for faster operation the need for supporting control systems is evident. For overhead gantry cranes such assisting control systems can be considered as state of the art. However, for more complex articulated multi-link cranes only a few applicable control concepts have been proposed. Load swing angle and angular velocity measurement, or corresponding state observer based estimation, has been seen as a main problem in the realization of such assisting control systems. To tackle the problem, we present a novel suspended load anti-sway control system for heavy-duty articulated hydraulic cranes using solely low-cost linear MEMS accelerometers and angular rate gyroscopes embedded into easy-to-install sensor units. The proposed closed-loop anti-sway controller uses a network of embedded MEMS sensors for the crane motion state, suspended load inclination angle and angular velocity estimation. The control concept uses a semi-active approach where the desired load velocity is set by the crane operator via e.g. joystick input and the underlying load oscillation damping control system creates the desired crane tip velocity. Comparative results of anti-sway control are obtained using high resolution incremental encoder feedback for the articulated crane and suspended load motion states. Our experimental results verify effectiveness of the proposed anti-sway control system for articulated hydraulic cranes as well as applicability of the proposed MEMS sensor network for real-time closed-loop control of multi-body manipulators.

Intestinal Bacteriology of Closed Loop, Strangulated Obstruction in Dogs.

1961 ◽  
Vol 41 (3) ◽  
pp. 245-250 ◽  
Author(s):  
George H. Bornside ◽  
Isidore Cohn
Keyword(s):  
Closed Loop

The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

2012 ◽  
Vol 220 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Sandra Sülzenbrück
Keyword(s):  
Empirical Research ◽  
Visual Feedback ◽  
Closed Loop ◽  
Motor Planning ◽  
Visual Input ◽  
Closed Loop Control ◽  
Loop Control ◽  
Feedback Type ◽  
Effective Use ◽  
The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

Generalized full/partial closed loop transmit diversity algorithm for WCDMA

2003 ◽  
Vol 14 (5) ◽  
pp. 471-477
Author(s):  
Dejan M. Novakovic ◽  
Markku J. Juntti ◽  
Miroslav L. Dukic
Keyword(s):  
Closed Loop ◽  
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