Optimal design of piezoelectric cantilever velocity sensor based on PVDF

2021 ◽  
pp. 1-12
Author(s):  
Liping Wang ◽  
Renwen Chen ◽  
Yuxiang Zhang ◽  
Chuan Liu
Keyword(s):  
Bernstein Polynomial ◽  
Simulation Optimization ◽  
Polynomial Equation ◽  
Method Of Moving Asymptotes ◽  
Speed Sensor ◽  
Speed Measurement ◽  
Sensor Sensitivity ◽  
Piezoelectric Cantilever ◽  
Low Sensitivity ◽  
Moving Asymptotes

The response charge of piezoelectric speed sensors using a conventional rectangular cantilever is low, which also causes a low sensitivity in speed measurement. To improve the sensor sensitivity, a piezoelectric speed sensor based on a streamlined piezoelectric cantilever is employed in this paper. Furthermore, a theoretical optimization model of the sensor based on Bernstein polynomial equation is established, and a simulation optimization flow work is also proposed. With method of moving asymptotes (MMA) algorithm, more charge output can be obtained than before. The simulation results show that the optimized sensor can output a voltage of 416 mV and obtain a sensitivity of 52 mV/m⋅s−1 when the input speed is 8 m/s. As compared with the values of 300 mV and 37.5 mV/m⋅s−1 in the un-optimized case, the improvement in the sensor sensitivity is up to 38%, which confirms the effectiveness of the proposed method.

Topology Synthesis of Large-Displacement Compliant Mechanisms

1999 ◽  
Author(s):  
Claus B. W. Pedersen ◽  
Thomas Buhl ◽  
Ole Sigmund
Keyword(s):  
Sensitivity Analysis ◽  
Optimization Problem ◽  
Adjoint Method ◽  
Compliant Mechanisms ◽  
Large Displacement ◽  
Element Formulation ◽  
Method Of Moving Asymptotes ◽  
Synthesis Tool ◽  
Lagrangian Finite Element ◽  
Moving Asymptotes

Abstract This paper describes the use of topology optimization as a synthesis tool for the design of large-displacement compliant mechanisms. An objective function for the synthesis of large-displacement mechanisms is proposed together with a formulation for synthesis of path-generating compliant mechanisms. The responses of the compliant mechanisms are modelled using a Total Lagrangian finite element formulation, the sensitivity analysis is performed using the adjoint method and the optimization problem is solved using the Method of Moving Asymptotes. Procedures to circumvent some numerical problems are discussed.

A spectral updating for the method of moving asymptotes

2010 ◽  
Vol 25 (6) ◽  
pp. 883-893 ◽  
Author(s):  
Márcia A. Gomes-Ruggiero ◽  
Mael Sachine ◽  
Sandra A. Santos
Keyword(s):  
Method Of Moving Asymptotes ◽  
Moving Asymptotes

scholarly journals SENSORLESS SPEED CONTROL OF THE DIRECT CURRENT MOTORS

2021 ◽  
Vol 2021 (58) ◽  
pp. 23-29
Author(s):  
S. Peresada ◽  
◽  
Y. Nikonenko ◽  
V. Pyzhov ◽  
D. Rodkin ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Dynamic Performance ◽  
Speed Control ◽  
Angular Speed ◽  
Observer Design ◽  
Loop Current ◽  
Speed Sensor ◽  
Speed Regulation ◽  
Speed Measurement ◽  
Measurement Design

In this paper, a new speed control algorithm for a permanent magnet DC motor which does not require implementation of the angular speed sensor is presented. Three steps are performed to develop the control system: design of speed tracking control algorithm assuming the speed measurement; design of speed observer; design of sensorless speed control algorithm based on the principle of separation. Information about speed is taken from the speed observer using the motor current value. The stability of the composite system dynamics consisting of three subsystems (the speed regulation loop, current regulation loop, and speed observer) is analyzed. The feedback gains tuning procedure for decoupling of three subsystems is given. The simulation results show that the dynamic performance of the designed system is similar to the performance of the system with angular speed measurement. The resulting closed-loop system has structural robustness properties with respect to parametric and coordinate disturbances. References 12, figures 2.

Topology Optimization of 3-D Nonlinear Magnetic Field Problem Using the Method of Moving Asymptotes

2016 ◽  
Vol 2016.12 (0) ◽  
pp. 2206
Author(s):  
Yoshifumi Okamoto ◽  
Hiroshi Masuda ◽  
Yutaro Kanda ◽  
Reona Hoshino ◽  
Shinji Wakao
Keyword(s):  
Magnetic Field ◽  
Topology Optimization ◽  
Field Problem ◽  
Method Of Moving Asymptotes ◽  
Moving Asymptotes

Full Load Performance Optimization Based on Turbocharger Speed Evaluation via Acoustic Sensing

2014 ◽  
Author(s):  
Nicolò Cavina ◽  
Matteo De Cesare ◽  
Vittorio Ravaglioli ◽  
Fabrizio Ponti ◽  
Federico Covassin
Keyword(s):  
Performance Optimization ◽  
High Performance ◽  
Low Cost ◽  
Control Architecture ◽  
Passenger Cars ◽  
Turbocharged Diesel Engine ◽  
Passenger Car ◽  
Full Load ◽  
Speed Sensor ◽  
Speed Measurement

Turbocharger performance optimization on passenger car engines is particularly challenging, especially in case of severe engine downsizing and downspeeding. On high performance engines (e.g., heavy duty truck applications) turbocharger speed measurement is usually performed with the aim of maximizing engine power and torque, limiting turbocharger over-speed, which is harmful for its durability and reliability. This solution is too expensive for passenger cars, and the turbocharger speed sensor is typically not available. In this work, an innovative and low cost sensing chain for the rotational speed evaluation of the turbocharger is applied. With this information, obtained via an acoustic sensor, a new turbocharger control architecture has been developed to optimize turbocharger performance, in order to improve engine output torque under full load conditions. After a brief description of the new sensing chain and of the electronic components developed to manage this kind of information, the paper shows the new control architecture that takes advantage of the turbocharger speed information. Moreover, experimental results on a small turbocharged Diesel engine for passenger car applications are presented, demonstrating the achieved benefits.

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