A Linear Piezomotor Integrated by a Monolithic Flexural Frame

1997 ◽  
Vol 119 (3) ◽  
pp. 414-416 ◽  
Author(s):  
Zhenqi Zhu ◽  
Bi Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tool ◽  
Design Process ◽  
Piezoelectric Actuators ◽  
Design Strategy ◽  
The Finite Element Method ◽  
Positioning Systems ◽  
High Stiffness ◽  
Mechanical Elements

A novel linear piezomotor is developed for machine tool applications. This paper presents the design strategy for this high stiffness linear piezomotor with nanometer resolution. The linear piezomotor consists of three piezoelectric actuators and one monolithic flexural frame. The design strategy is to reduce the total number of mechanical elements and interfaces and to integrate all the elements into the frame. The finite element method is used in the design process. The design strategy should also be applicable to other positioning systems where a high stiffness and high positioning resolution are required.

The Bulging of Bolted Guideways

1996 ◽  
Vol 118 (2) ◽  
pp. 280-285 ◽  
Author(s):  
Zhenqi Zhu ◽  
Bi Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tool ◽  
Design Process ◽  
Three Dimensional ◽  
Bolted Joints ◽  
Machine Design ◽  
Lower Portion ◽  
Loading Conditions ◽  
The Finite Element Method

As bolted joints affect the overall accuracy and stiffness of a machine tool, their behaviors have always been important to consider in a machine design process. The bulging phenomenon of a bolted guideway needs to be investigated under different loading conditions. A considerable amount of research has been reported on bolted joints; however, none is focused on the bulging of a bolted guideway. In this article, the bulging of three types of guideways is studied using the finite element method and the results are verified by the experiments using capacitance sensors. It turns out that the bulging occurs in such a way that the lower portion of a guideway expands while the top portion around the bolt sinks in the order of micrometers. The results would help the machine tool builders to reduce or eliminate the errors induced by the bulging effect from their products. The results are also useful to other applications of bolted joints where three-dimensional deformation occurs.

The Structural Analysis and Rapid Optimization for High-Speed Spindle Box

2011 ◽  
Vol 199-200 ◽  
pp. 1269-1272
Author(s):  
Huai Xing Wen ◽  
Lu Jun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Optimal Design ◽  
Design Process ◽  
High Speed ◽  
Structural Parameters ◽  
The Finite Element Method ◽  
Target Setting ◽  
Fuzzy Constraints

Through the optimization of the design process, the application of the finite element method and the structural parameters design have avoided blindness of product design, reduced unnecessary waste, waste of material and time for example. The fuzzy constraints has been determined by the sensitivity calculation , and the use numerical method and procedures of chart to analyze and compare, the target setting in the specified range has been searched for the structure. Thus the optimal design got achieved.

Development of a Compact Deformable Mirror Using Push-Pull Actuators

2014 ◽  
Vol 613 ◽  
pp. 200-203
Author(s):  
Hiroki Shimizu ◽  
Keitaro Tanaka ◽  
Yuuma Tamaru
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Piezoelectric Actuators ◽  
Practical Method ◽  
Simulation Method ◽  
Deformable Mirror ◽  
The Finite Element Method ◽  
Convex Shape ◽  
Long Term Stability

A small deformable mirror which realizes concave shape as well as convex shape has been developed. In addition, this deformable mirror was developed to realize long term stability. For this purpose, a new push-pull actuator using two multilayered piezoelectric actuators aligned inline was designed. In this process, a practical method for simulating the property of piezoelectric actuator in the finite element method was proposed. From the experimental results, it was confirmed that newly developed deformable mirror has the ability to make complex profiles. Furthermore, efficiency of proposed simulation method was also confirmed.

Coevolutionary and genetic algorithm based building spatial and structural design

2015 ◽  
Vol 29 (4) ◽  
pp. 351-370 ◽  
Author(s):  
Hèrm Hofmeyer ◽  
Juan Manuel Davila Delgado
Keyword(s):  
Genetic Algorithm ◽  
Finite Element Method ◽  
Finite Element ◽  
Design Process ◽  
Process Simulation ◽  
Structural Design ◽  
The Finite Element Method ◽  
Design Modification ◽  
Spatial Design ◽  
Element Method

AbstractIn this article, two methods to develop and optimize accompanying building spatial and structural designs are compared. The first, a coevolutionary method, applies deterministic procedures, inspired by realistic design processes, to cyclically add a suitable structural design to the input of a spatial design, evaluate and improve the structural design via the finite element method and topology optimization, adjust the spatial design according to the improved structural design, and modify the spatial design such that the initial spatial requirements are fulfilled. The second method uses a genetic algorithm that works on a population of accompanying building spatial and structural designs, using the finite element method for evaluation. If specific performance indicators and spatial requirements are used (i.e., total strain energy, spatial volume, and number of spaces), both methods provide optimized building designs; however, the coevolutionary method yields even better designs in a faster and more direct manner, whereas the genetic algorithm based method provides more design variants. Both methods show that collaborative design, for example, via design modification in one domain (here spatial) to optimize the design in another domain (here structural) can be as effective as monodisciplinary optimization; however, it may need adjustments to avoid the designs becoming progressively unrealistic. Designers are informed of the merits and disadvantages of design process simulation and design instance exploration, whereas scientists learn from a first fully operational and automated method for design process simulation, which is verified with a genetic algorithm and subject to future improvements and extensions in the community.

scholarly journals Bidirectional Active Piezoelectric Actuator Based on Optimized Bridge-Type Amplifier

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1013
Author(s):  
Weiqing Huang ◽  
Junkai Lian ◽  
Mingyang Chen ◽  
Dawei An
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Piezoelectric Actuators ◽  
Displacement Curve ◽  
Structural Flexibility ◽  
The Finite Element Method ◽  
Return Stroke ◽  
Positioning Accuracy ◽  
Nonlinear Error ◽  
Bridge Type

Piezoelectric actuators based on bridge displacement amplifying mechanisms are widely used in precision driving and positioning fields. The classical bridge mechanism relies on structural flexibility to realize the return stroke, which leads to the low positioning accuracy of the actuator. In this paper, a series bridge mechanism is proposed to realize a bidirectional active drive; the return stroke is driven by a piezoelectric stack rather than by the flexibility of the structure. By analyzing the parameter sensitivity of the bridge mechanism, the series actuation of the bridge mechanism is optimized and the static and dynamic solutions are carried out by using the finite element method. Compared with the hysteresis loop of the piezoelectric stack, the displacement curve of the proposed actuator is symmetric, and the maximum nonlinear error is improved. The experimental results show that the maximum driving stroke of the actuator is 129.41 μm, and the maximum nonlinear error is 5.48%.

Influence of Heat in Multi-Tasking Machine Bed and its Analytical Technique

2018 ◽  
Vol 12 (2) ◽  
pp. 254-261 ◽  
Author(s):  
Kenichi Nakanishi ◽  
Manabu Sawada ◽  
Jiro Sakamoto ◽  
◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tool ◽  
Analytical Techniques ◽  
The Finite Element Method ◽  
Analytical Technique ◽  
Casting Technology ◽  
Internal Structures ◽  
Cast Product ◽  
Cast Products

When designing a large-sized cast product for a multi-spindled machine tool, such as a multi-turret type multi-tasking machine, we must first determine its thermal deformations by the finite element method (FEM) in order to ensure that the structure is designed with high thermal rigidity. Casting technology has progressed so much that we can now form more complicated internal structures and produce much thinner and lighter cast products. Moreover, since designing cast products has become much faster, higher-efficiency analytical techniques are also required. Such analytical techniques are operated by designers where analyses and design are executed interchangeably. In this study, we compared the experimental results to the analytical results in order to evaluate the employed analytical technique based on an actual analysis of a multi-tasking machine bed with a few different rib structures.

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