scholarly journals A practical stochastic evaluation method based on the entropy criterion for a characteristic improvement of sound insulation walls.

1987 ◽  
Vol 8 (4) ◽  
pp. 145-150
Author(s):  
Mitsuo Ohta ◽  
Shin'ya Kuwahara
Keyword(s):  
Evaluation Method ◽  
Sound Insulation ◽  
Entropy Criterion

scholarly journals A Technical Assessment of Comfort Performance of Hanok Using Comparative Field Surveys between Experts and Users

2020 ◽  
Vol 12 (24) ◽  
pp. 10315
Author(s):  
Mi-Hyang Lee ◽  
Deuk-Youm Cheon ◽  
Seung-Hoon Han
Keyword(s):  
Psychological Factors ◽  
Evaluation System ◽  
Evaluation Method ◽  
Test Method ◽  
Sound Insulation ◽  
Environmental Sensors ◽  
Traditional Architecture ◽  
Merit Factor ◽  
Degree Of Satisfaction

The paper aims to evaluate the psychological factors of the comfort performance of the hanok. This is to guide restoration and improvement in consideration of the intangible variables that provide the quality of the hanok. Through this process, we ultimately intend to build an integrated residential performance evaluation system that includes factors related to the quality of residents’ lives, such as the comfort of their surrounding and indoor environment, as well as the functionality and convenience of the hanok, a representative type of Korean traditional architecture. The test method to evaluate the comfort performance of hanok is largely divided into the physical perception element, which is a quantitative indicator, and the psychological cognitive element, which is a qualitative indicator. Physical perceptive factors are composed of nine quantifiable factors that can be measured by numerical values, namely humidity control, condensation, insulation, thermal comfort, air permeability, solar radiation, solar lighting, sound insulation, and air cleanness. This is a perceptual concept of viewing a building as it is, and a quantitative evaluation method of measuring data in the field using environmental sensors and equipment. Psychological cognitive factors that are evaluated based on the experiences of users (residents) living in hanok, are classified into five categories, of scenery, beauty, deodorization, usability, and health. This study was conducted through a questionnaire between experts and users (residents), limited to the psychological factors among methods of evaluating the comfort performance of hanok. As a result, it can be seen that environmental factors are the main variables that influence the degree of satisfaction with the psychological perception factor. This might be a merit factor of general hanok, and weight could be given when creating an integrated standard in the future.

scholarly journals Evaluation Method for Façade Acoustic Insulation for a Corner Room: Discussion on the Results Obtained as a Function of the Source Position

2020 ◽  
Vol 10 (21) ◽  
pp. 7434
Author(s):  
Nicola Granzotto ◽  
Edoardo Alessio Piana
Keyword(s):  
Sound Source ◽  
Evaluation Method ◽  
International Standards ◽  
Sound Insulation ◽  
Source Position ◽  
Noise Levels ◽  
Acoustic Attenuation ◽  
Acoustic Insulation ◽  
Building Facades ◽  
The Individual

The appropriate acoustic insulation project of building façades is of importance for the design of highly comfortable living environments. In some countries, national regulations require maximum noise levels inside rooms, or minimum sound insulation limits, to be respected. The acoustic insulation design of a façade is usually performed according to the ISO 12354-3 standard, which presents a calculation method based on the geometry of the room, the shape of the façade, the areas and the acoustic performances of the individual elements. The prescribed limits must be experimentally verified according to methods derived from international standards. However, the current versions of such standards do not provide details on how to perform the measurements and the calculation of the sound insulation for corner rooms. An important remark is that, depending on the position of the sound source used for the measurements, different results of the standardized sound insulation are obtained. This article proposes a new method for calculating the façade insulation of corner rooms by introducing the acoustic attenuation due to the diffraction of the corner and the distance of the sound source from the façades, estimated through simulations and experimentally validated.

scholarly journals Research work of Prof. Tomita, including: 1. Examination of environmental vibration measurement using vibration control rubber on carpet. 2. Measures against floor impact sound by heavy-impact source using storage furniture with tatami. 3. Study on tatami mat considering safety when falling in case of falling collision and sound insulation performance. 4. Research on evaluation method and evaluation rank for vertical vibration

Impact ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 15-17
Author(s):  
Ryuta Tomita
Keyword(s):  
Evaluation Method ◽  
Research Work ◽  
Vertical Vibration ◽  
Vibration Measurement ◽  
Sound Insulation ◽  
Polystyrene Foam ◽  
Research On Evaluation ◽  
Environmental Vibration ◽  
Insulation Performance ◽  
Extruded Polystyrene Foam

A tatami is a type of mat used as a floor material in many rooms in Japan. They are also used in training rooms, such as in a dojo or martial arts, and are often covered with woven straw. Tatami mats were used as flooring materials for buildings in the Kamakura period (c. 1185) and have a long history. Tatami is often used in the Japanese-style room of today's homes. Generally, tatami mats are 55 mm thick; some mats are made of mostly straw and some made of insulation board and extruded polystyrene foam. The surface of both types of mats is covered with tatami facing. More recently, tatami mats made of insulation board and extruded polystyrene foam are used in homes. Despite their presence in Japanese buildings, there are several problems associated with tatami mats and other floor materials. One of the potential problems concerns the safety of individuals who fall on the mats, while another is the sound created by impact on the mats, such as when people walk or run across them. Research is underway to find effective ways of improving the sound insulation performance of floor materials at the same time as considering the safety of the inhabitants of the buildings with the mats in them. One team, which is investigating means of improving tatami mats and the materials used to build them, is based at the College of Science and Technology in Nihon University, Japan. Led by Professor Ryuta Tomita, the team is engaged with several projects revolving around overcoming heavy-weight floor impact sound insulation performance and safety of individuals who fall on tatami mats.

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