scholarly journals EVALUATION METHOD OF CONTACT TEMPERATURE CHANGE OF PALM CONTACTING WITH MATERIAL : Evaluation method of contact thermal sensation of material from cold to hot (Part 1)

2002 ◽  
Vol 67 (558) ◽  
pp. 45-52
Author(s):  
Satoshi KAWASAKI ◽  
Isamu MATSUI ◽  
Noboru YUASA ◽  
Satoshi TANABE
Keyword(s):  
Temperature Change ◽  
Evaluation Method ◽  
Thermal Sensation ◽  
Contact Temperature ◽  
Material Evaluation

Presentation of Rapid Temperature Change Using Spatially Divided Hot and Cold Stimuli

2013 ◽  
Vol 25 (3) ◽  
pp. 497-505 ◽  
Author(s):  
Katsunari Sato ◽  
◽  
Takashi Maeno
Keyword(s):  
Temperature Change ◽  
Thermal Sensation ◽  
Spatial Summation ◽  
Single Stimulus ◽  
Experimental Results ◽  
Thermal Perception ◽  
Rapid Temperature ◽  
Temperature Sense ◽  
Thermal Stimuli

We propose a thermal display that presents a rapid temperature change using spatially divided hot and cold stimuli. The display exploits two characteristics of human thermal perception: spatial summation and the adapting temperature. Experimental results confirmed that users perceived separate individual thermal stimuli as a single stimulus because of spatial summation. Our thermal display successfully made the skin simultaneously more sensitive to both hot and cold stimuli by using spatially divided hot and cold stimuli, each of which separately adjusts the adapting temperature so that it enables users to perceive thermal sensation rapidly. The thermal display that we fabricated enabled users to perceive a different temperature sense by changing the temperature of hot and cold stimuli.

Development of a temperature control procedure for a room air-conditioner using the concept of just noticeable difference (JND) on thermal sensation

1996 ◽  
Vol 40 (9) ◽  
pp. 473-477
Author(s):  
Chang K. Cho ◽  
Hak Min Lee ◽  
Myung Hwan Yun ◽  
Myun W. Lee
Keyword(s):  
Temperature Change ◽  
Temperature Control ◽  
Design Variable ◽  
Thermal Sensation ◽  
Just Noticeable Difference ◽  
Control Procedure ◽  
Air Conditioner ◽  
Ergonomic Design ◽  
Cooling Control ◽  
Cooling Procedure

Temperature control for an air-conditioner is an ergonomic design variable. Ergonomic studies on the thermal sensations in room environment are relatively few while many studies are available for the thermal sensations in extremely warm/cold conditions. The objective of this study was to find out factors which affect the cutaneous thermal sensations and so to propose new cooling control procedure using the JND(just noticeable difference) values of cutaneous thermal sensation for the design of an air-conditioner. The JNDs of cutaneous thermal sensation corresponding to the skin, room temperatures and temperature change rates were obtained. Based on the result of the study, a new cooling procedure using the concept of JND on thermal sensation was developed and applied to a new air-conditioner model.

scholarly journals Thermal Tactile Presentation Based on Prediction of Contact Temperature

2006 ◽  
Vol 18 (3) ◽  
pp. 226-234 ◽  
Author(s):  
Akio Yamamoto ◽  
◽  
Hiroaki Yamamoto ◽  
Benjamin Cros ◽  
Hironori Hashimoto ◽  
...  
Keyword(s):  
Control Method ◽  
Thermal Sensation ◽  
Tactile Display ◽  
Contact Temperature ◽  
Temperature Decrease ◽  
Material Recognition ◽  
Object Based ◽  
Real Objects ◽  
Rapid Temperature ◽  
The Moment

The thermal sensation corresponding to the touching of an object is one of the most important factors in material recognition. In virtual reality or tele-operation systems, thermal display functions should be embedded in order to obtain satisfactory realism. Since our skin sensors are sensitive to rapid changes in temperature, thermal sensations are thought to arise mainly from the rapid temperature decrease that occurs at the moment of contact between our fingers and an object. Based on this consideration, the present paper proposes a new control method for thermal tactile display to simulate the temperature decrease at the moment of contact. The proposed method controls a thermal tactile display based on the prediction of contact temperature, so that the correct temperature decrease can be produced at the fingertip surface. In addition, we herein report an additional method by which to optimize the thermal rendering for individual subjects. In the optimization, the thermal property of each subject is estimated immediately prior to thermal presentation. The experimental results reveal that the tendency of material discrimination for the thermal tactile display is similar to that for real objects, indicating the validity of the proposed method.

Fracture Evaluation of Low-Density Porous Materials by Reaction Force Analysis in Ball Indentation Test

2017 ◽  
Author(s):  
Takayuki Ishino ◽  
Atsushi Sakuma
Keyword(s):  
Evaluation Method ◽  
Reaction Force ◽  
Indentation Test ◽  
Evaluation Procedure ◽  
Simple Formulation ◽  
Plateau Stress ◽  
Indentation Force ◽  
Material Evaluation ◽  
Indentation Tests ◽  
Ball Indentation Test

An indentation test can easily measure the deformation characteristics of a material, because it does not require a test specimen to be cut from the material being examined. The applicability of this test is usually restricted to evaluating the fundamental characteristics of deformation, such as elasticity and plasticity; however, it is also useful if the test can be applied for the fracture evaluation of materials. Therefore, in this study, the fracture behavior of materials is discussed by performing indentation tests. The evaluation procedure depends on the variation in the indentation force owing to the differences in the deformation behavior. The observed variation is analyzed via the fractography of the material. A simple formulation is derived from the results for the development of a material evaluation method. Finally, the importance of the choice of the indenter diameter is explained in terms of the accuracy of the plateau stress of the porous material.

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