Precise Impact Drive Mechanism Based on Asymmetrically Clamped Piezoelectric Actuator

2010 ◽  
Vol 37-38 ◽  
pp. 870-874 ◽  
Author(s):  
Shun Ming Hua ◽  
Guang Ming Cheng ◽  
Zhi Yu Zhang ◽  
Ping Zeng
Keyword(s):  
Piezoelectric Actuator ◽  
Dynamic Characteristics ◽  
Impact Force ◽  
Maximum Velocity ◽  
Loading Capacity ◽  
Electric Voltage ◽  
Drive Mechanism ◽  
Maximum Loading

A new precise linear impact drive mechanism (IDM) was proposed. Differing from the traditional ones, the new IDM can run silently driven by sinusoidal electric voltage. But the actuating force was also inertial impact force generated by a set of asymmetrically clamped cantilever bimorphs. The dynamic characteristics had been experimentally studied on prototype of the IDM. The main results under 50 volt are listed below. The resolution is 27 nm, the maximum velocity 17 mm/s at 35 Hz. And, the maximum loading capacity is not less than 100 g when applied 100 V at 35 Hz.

An inertial piezoelectric actuator with small structure but large loading capacity

2021 ◽  
Vol 92 (8) ◽  
pp. 085004
Author(s):  
Yinghua Cao ◽  
Zhi Xu ◽  
Linjing You ◽  
Yaxuan Wu ◽  
Hu Huang
Keyword(s):  
Piezoelectric Actuator ◽  
Loading Capacity ◽  
Small Structure

An Action Reversible Mechanism with Piezoelectric Actuator

2011 ◽  
Vol 105-107 ◽  
pp. 1727-1730
Author(s):  
Yu Juan Tang ◽  
Jiong Wang
Keyword(s):  
Piezoelectric Actuator ◽  
Electromagnetic Interference ◽  
Small Volume ◽  
Safety System ◽  
Stepping Motor ◽  
Compact Structure ◽  
Drive Mechanism ◽  
Independent Components ◽  
Safe State

At present, the explosion isolator of the fuze safety system using stepping motor or based on the slider continuation move realized safe state restorability, but the former is restricted by the volume of stepping motor, however, the stepping motor is vulnerable to electromagnetic interference; the latter structure is complex, with several independent components, not compact and irreversible. In view of this, an action reversible mechanism based on piezoelectric actuator is proposed, realizing the fuze safety system reversibility. The principle of the piezoelectric actuator is described and the drive mechanism is designed. The feasibility is analysed. The study shows that the mechanism has the certain practical value for compact structure, small volume and reliable actuation.

Waveform optimization of a two-axis smooth impact drive mechanism actuator

2020 ◽  
pp. 1045389X2095126 ◽  
Author(s):  
Jianxiang Wang ◽  
Yuxi Chen ◽  
Yuxin Peng ◽  
Xian Song ◽  
Yangkun Zhang ◽  
...  
Keyword(s):  
Short Term Memory ◽  
Maximum Velocity ◽  
Input Voltage ◽  
Data Driven ◽  
Voltage Waveform ◽  
Drive Mechanism ◽  
Waveform Optimization ◽  
Piezoelectric Elements ◽  
Long Short Term Memory ◽  
Optimum Input

This paper presents a data-driven method for waveform optimization of a two-axis smooth impact drive mechanism (SIDM) actuator. The actuator was constructed by two piezoelectric elements (PZTs) perpendicularly fixed to an L-shaped base for two-axis positioning. An XY stage was designed and constructed by assembling the two-axis SIDM actuator. The XY stage could position long motion ranges of several millimeters with nanometer-level resolution, and the size was confined to be 20 mm (X) × 20 mm (Y) × 4.5 mm (H). The data-driven method based on the long short-term memory (LSTM) neural networks was used to predict the optimum input voltage waveform of the actuator. With the optimized input voltage waveform, it was verified that the maximum velocity of the stage could be improved about two times.

DYNAMIC CHARACTERISTICS MEASUREMENTS OF A FORCE TRANSDUCER AGAINST SMALL AND SHORT-DURATION IMPACT FORCES

2014 ◽  
Vol 21 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Mitra Djamal ◽  
Kazuhide Watanabe ◽  
Kyohei Irisa ◽  
Irfa Aji Prayogi ◽  
Akihiro Takita ◽  
...  
Keyword(s):  
Short Duration ◽  
Dynamic Characteristics ◽  
Impact Force ◽  
Inertial Force ◽  
Small Mass ◽  
Force Transducer ◽  
Force Transducers ◽  
Impact Forces ◽  
Maximum Impact Force ◽  
The Impact

Abstract A method for evaluating the dynamic characteristics of force transducers against small and short-duration impact forces is developed. In this method, a small mass collides with a force transducer and the impact force is measured with high accuracy as the inertial force of the mass. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the mass, which is the moving part of the bearing. Small and short-duration impact forces with a maximum impact force of approximately 5 N and minimum half-value width of approximately 1 ms are applied to a force transducer and the impulse responses are evaluated.

Dynamic Response Analysis of Control Rod Drive Mechanism Under the Stepping Impact Force for Nuclear Power Plants

2012 ◽  
Author(s):  
Xiaoyao Shen ◽  
Yongcheng Xie
Keyword(s):  
Dynamic Response ◽  
Nuclear Power ◽  
Power Plants ◽  
Structural Integrity ◽  
Impact Force ◽  
Response Analysis ◽  
Control Rod ◽  
Drive Mechanism ◽  
Finite Element Software ◽  
The Impact

The control rod drive mechanism (CRDM) is an important safety-related component in the nuclear power plant (NPP). When CRDM steps upward or downward, the pressure-containing housing of CRDM is shocked axially by an impact force from the engagement of the magnetic pole and the armature. To ensure the structural integrity of the primary coolant loop and the functionality of CRDM, dynamic response of CRDM under the impact force should be studied. In this manuscript, the commercial finite element software ANSYS is chosen to analyze the nonlinear impact problem. A nonlinear model is setup in ANSYS, including main CRDM parts such as the control rod, poles and armatures, as well as nonlinear gaps. The transient analysis method is adopted to calculate CRDM dynamic response when it steps upward. The impact loads and displacements at typical CRDM locations are successfully obtained, which are essential for design and stress analysis of CRDM.

A piezoelectric direct-drive servo valve with a novel multi-body contacting spool-driving mechanism: Design, modelling and experiment

2013 ◽  
Vol 228 (1) ◽  
pp. 169-185 ◽  
Author(s):  
Guan Changbin ◽  
Jiao Zongxia
Keyword(s):  
Piezoelectric Actuator ◽  
Dynamic Characteristics ◽  
Driving Mechanism ◽  
Direct Drive ◽  
Nonlinear Dynamic Model ◽  
Servo Valve ◽  
In Series ◽  
Dynamic Simulation Model ◽  
Pulling Force ◽  
Multi Body

Stack-type piezoelectric actuators, which usually consist of several ceramic layers connected in series, are widely used in piezoelectric direct-drive servo valves (PDDSV). However, poor pulling force capacity of this kind of actuators affects the performances of the direct-drive servo valves. This article presents a new type of PDDSV, whose spool-driving mechanism is composed of a set of independent parts that are not fixed together but are in contact with each other. This multi-body contacting spool-driving mechanism provides bidirectional movement of the spool by a preloaded stack-type piezoelectric actuator and a driving disc spring. This prevents the stack-type piezoelectric actuator from bearing the pulling force due to the inertia and friction of the spool. Design of the proposed servo valve is illustrated in detail and its characteristics are also predicted. Based on a nonlinear dynamic model of the multi-body contacting spool-driving mechanism, a comprehensive dynamic simulation model of the proposed PDDSV is established. Static and dynamic characteristics of the proposed PDDSV have been studied experimentally and good agreements between experimental and simulation results are observed. The dynamic performances of the proposed PDDSV are compared with the existing piezoelectric servo valves, which demonstrate that the proposed PDDSV has satisfactory dynamic characteristics for high-frequency applications.

scholarly journals Do Strike Patterns or Shoe Conditions Have a Predominant Influence on Foot Loading?

2018 ◽  
Vol 64 (1) ◽  
pp. 13-23 ◽  
Author(s):  
Xiaole Sun ◽  
Yang Yang ◽  
Lin Wang ◽  
Xini Zhang ◽  
Weijie Fu
Keyword(s):  
Plantar Pressure ◽  
Loading Rate ◽  
Peak Pressure ◽  
Impact Force ◽  
Pressure System ◽  
Risk Of Injury ◽  
Maximum Loading ◽  
Peak Plantar Pressure ◽  
Foot Loading ◽  
The Impact

Abstract This study aimed to explore the effects of strike patterns and shoe conditions on foot loading during running. Twelve male runners were required to run under shoe (SR) and barefoot conditions (BR) with forefoot (FFS) and rearfoot strike patterns (RFS). Kistler force plates and the Medilogic insole plantar pressure system were used to collect kinetic data. SR with RFS significantly reduced the maximum loading rate, whereas SR with FFS significantly increased the maximum push-off force compared to BR. Plantar pressure variables were more influenced by the strike patterns (15 out of 18 variables) than shoe conditions (7 out of 18 variables). The peak pressure of midfoot and heel regions was significantly increased in RFS, but appeared in a later time compared to FFS. The influence of strike patterns on running, particularly on plantar pressure characteristics, was more significant than that of shoe conditions. Heel-toe running caused a significant impact force on the heel, whereas wearing cushioned shoes significantly reduced the maximum loading rate. FFS running can prevent the impact caused by RFS. However, peak plantar pressure was centered at the forefoot for a long period, thereby inducing a potential risk of injury in the metatarsus/phalanx.

Sign in / Sign up

Export Citation Format

Share Document