An efficient electro‐thermo‐mechanical model for the analysis of V‐shaped thermal actuator connected with driven structures

2020 ◽  
Author(s):  
Lin‐Feng Zhao ◽  
Zai‐Fa Zhou ◽  
Mu‐Zi Meng ◽  
Meng‐Jie Li ◽  
Qing‐An Huang
Keyword(s):  
Mechanical Model ◽  
Thermal Actuator

MEMS Rotational Actuator for High Force and Large Displacement

2008 ◽  
Vol 54 ◽  
pp. 372-377
Author(s):  
Luke J. Currano ◽  
Danny Gee ◽  
Wayne A. Churaman ◽  
Madan Dubey ◽  
Paul Amirtharaj ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Test Data ◽  
Material Properties ◽  
Mechanical Model ◽  
Large Displacement ◽  
Thermal Actuator ◽  
Large Displacements ◽  
Model Predictions ◽  
Rotational Actuator ◽  
Good Agreement

A MEMS thermal actuator that provides rotational or near-linear translational displacements is investigated. This actuator provides a solution to applications that require highforces and large displacements. Output moments up to 7x10-7 N-m and free rotations of up to 3 degrees were measured. These correspond to forces of up to 1.44mN at a displacement of 23.7μm, yielding a work of 3.41x10-8 N-m. An electrothermal-mechanical model that considers temperature dependence of material properties is presented, and the model predictions show good agreement with actuator test data.

TECHNOLOGICAL CONTROL OF THE CONTACT PRESSURE ON THE CYLINDRICAL SUBSTRATE FROM THE SIDE OF THE COATING ADDITIVELY FORMED ON ITS EXTERNAL SURFACE

2020 ◽  
Author(s):  
Dmitriy Parshin
Keyword(s):  
Stress State ◽  
Contact Pressure ◽  
Mechanical Model ◽  
External Surface ◽  
Layer By Layer ◽  
Layer Formation ◽  
Technological Control ◽  
Manufactured Products ◽  
Arbitrary Thickness

The article gives an example of controlling the stress state parameters of additively manufactured products. The study was carried out on the basis of a developed non-classical mechanical model of the process of layer-by-layer formation of a coating of arbitrary thickness on a cylindrical substrate. The model is based on modern concepts of the mechanics of continuously growing bodies and allows one to obtain fairly simple analytical dependencies. On the basis of the latter, the problem of technological control of the evolution of contact pressure at the substrate – coating interface is solved in the article. A number of practically significant conclusions have been made.

An instructive chemo-mechanical model for bonded geomaterials

2005 ◽  
Vol 9 (5-6) ◽  
pp. 671-688
Author(s):  
Roberto Nova ◽  
Marco Parma
Keyword(s):  
Mechanical Model

FINE-TUNING OF MODELLING STRATEGY TO SIMULATE THERMO-MECHANICAL BEHAVIOUR OF DOUBLE FRICTION PENDULUM SEISMIC ISOLATORS UST ESTIMATOR

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 165-172
Author(s):  
Vincenzo Bianco ◽  
Giorgio Monti ◽  
Nicola Pio Belfiore
Keyword(s):  
Multibody Dynamics ◽  
Mechanical Behaviour ◽  
Mechanical Model ◽  
Dynamic Behaviour ◽  
Experimental Testing ◽  
Fine Tuning ◽  
Proposed Model ◽  
Modelling Techniques ◽  
Friction Pendulum

The use of friction pendulum devices has recently attracted the attention of both academic and professional engineers for the protection of structures in seismic areas. Although the effectiveness of these has been shown by the experimental testing carried out worldwide, many aspects still need to be investigated for further improvement and optimisation. A thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented in this paper. The proposed model is based on the observation that sliding may not take place as ideally as is indicated in the literature. On the contrary, the fulfilment of geometrical compatibility between the constitutive bodies (during an earthquake) suggests a very peculiar dynamic behaviour composed of a continuous alternation of sticking and slipping phases. The thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented. The process of fine-tuning of the selected modelling strategy (available to date) is also described.

Causality Then and Now

1993 ◽  
Vol 10 (2) ◽  
pp. 165-177
Author(s):  
Karen Harding
Keyword(s):  
Quantum Theory ◽  
Common Sense ◽  
Mechanical Model ◽  
Physical World ◽  
Scientific Data ◽  
The World ◽  
The Common ◽  
The Universe ◽  
The Way

Ate appearances deceiving? Do objects behave the way they do becauseGod wills it? Ate objects impetmanent and do they only exist becausethey ate continuously created by God? According to a1 Ghazlli, theanswers to all of these questions ate yes. Objects that appear to bepermanent are not. Those relationships commonly tefemed to as causalare a result of God’s habits rather than because one event inevitably leadsto another. God creates everything in the universe continuously; if Heceased to create it, it would no longer exist.These ideas seem oddly naive and unscientific to people living in thetwentieth century. They seem at odds with the common conception of thephysical world. Common sense says that the universe is made of tealobjects that persist in time. Furthermore, the behavior of these objects isreasonable, logical, and predictable. The belief that the univetse is understandablevia logic and reason harkens back to Newton’s mechanical viewof the universe and has provided one of the basic underpinnings ofscience for centuries. Although most people believe that the world is accutatelydescribed by this sort of mechanical model, the appropriatenessof such a model has been called into question by recent scientificadvances, and in particular, by quantum theory. This theory implies thatthe physical world is actually very different from what a mechanicalmodel would predit.Quantum theory seeks to explain the nature of physical entities andthe way that they interact. It atose in the early part of the twentieth centuryin response to new scientific data that could not be incorporated successfullyinto the ptevailing mechanical view of the universe. Due largely ...

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