Floor Impact Noise Characteristics Depending on the Experimental Conditions Using Impact Ball

Lee, Won-Hak; Haan, Chan-Hoon

doi:10.7776/ask.2011.30.2.092

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The drop height of the standard-weight impact force characteristic 2 mentioned in ISO 16283-2 and KS F 2810-2 is 1 m [44,45]. In this case, the impact force is about 1800 N, and the impact force generated by the children's behavior is about 1100 N, which is similar to a rubber ball drop height of 0.4 m [46,47]. The experimental floor mat specimen was placed at the center of the living room of the sound source room.…”

Section: Impact Sound Sources and Measurement Methodsmentioning

confidence: 99%

Impact Sound Reduction Performances of Additional Floor Mats for the Retrofitting of an Existing Apartment Building in Accordance with Test-Bed Conditions

Kim,

Moon,

Yeon

2024

Applied Sciences

View full text Add to dashboard Cite

Floor mats are commonly used to improve the impact sound performance of existing homes, but actual impact sound reductions do not consistently appear, as they depend on the test-bed conditions used to determine impact sound performance. Therefore, this study evaluated the effects of the environmental conditions of the test bed on the impact sound reduction performances of different floor mats. The Korean industrial standard KS F 2865 specifies the measurement method in the test room and sets the thickness range of the available target floor structure to bare slabs with thicknesses ranging from 120 mm to 210 mm. The evaluation method is ∆L, which is the difference in standardized impact sound levels before and after the installation of the floor finishing material. In this study, a total of eight types of floor mats were tested in four different test beds according to KS F 2865. The impact sources used were tapping, bang machines, and a rubber ball, and we used these sources to consider both light-weight and heavy-weight impact sounds. The results were derived as the impact sound reduction performance for each frequency band and a single-number quantity. The results showed that light impact sound had a similar minimum reduction characteristic of at least 38 dB, regardless of the floor structure on which the mat was installed. However, the heavy-weight impact sound showed different tendencies depending on the floor mat and the characteristics of the floor structure of the test bed when a bang machine and a rubber ball were used. In particular, the reduction achieved by the bang machine showed less than half the tendency of the reduction by the rubber ball, and the tendency of the heavy-weight impact sound was shown to be reducible depending on how the floor mat was maintained, but the reductions differed depending on the test bed. The reductions were larger in the box-type test room than in the real-life-type test room, and among the box-type test rooms, the one with a thicker bare slab showed a relatively larger reduction. In addition, the reliability of the measurement results was evaluated through a correlation analysis between the single-number quantities depending on the thicknesses of the bare slabs of the test beds.

show abstract

Section: Impact Sound Sources and Measurement Methodsmentioning

confidence: 99%

Impact Sound Reduction Performances of Additional Floor Mats for the Retrofitting of an Existing Apartment Building in Accordance with Test-Bed Conditions

Kim,

Moon,

Yeon

2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…A rubber ball, also known as an impact ball [1], is a hollow sphere made of rubber with a diameter of 180 mm and a thickness of 30 mm. It is primarily used for architectural acoustic measurement activities, simulating human activities and serving as a standard impact source for noise.…”

Section: Introductionmentioning

confidence: 99%

The calibration device research for assessing the impact exposure level of rubber balls in architectural acoustics

Li,

Yan,

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In order to accurately measure the impact exposure level of rubber balls used in architectural acoustics, a calibration device is designed based on a force sensor, signal analyzer, programmable stepper motor and Infinite Impulse Response (IIR) filter. A weighing sensor with a range of 200 kg is selected to match the range of impact forces of rubber balls. The sensor is installed on a specially designed metal base plate of a rubber ball measuring fixture and connected to the signal analyzer. The rubber ball is dropped from a predetermined height in a free-fall manner to impact the sensor, generating an impact waveform. The force exposure level is then calculated by using software algorithms built into the device. The accuracy and reliability of the calibration device are evaluated by conducting repeated measurements on rubber balls and comparing the results with a known standard force exposure level curve. The experimental results demonstrate that the calibration device can consistently and stably measure the force exposure level of rubber balls, showing consistency with the known standard values. However, due to limitations such as a limited variety of measured objects and insufficient measurement repetitions, further research will be conducted to increase the number of tested rubber balls and enhance the device’s capabilities. This will provide technical support for the further development and application of the device.

show abstract

The Improvement in the Floor Impact Noise with Changes in the Glass Transition Temperature of an SBR Latex Mortar

Haan,

Lee,

Park

2024

Applied Sciences

View full text Add to dashboard Cite

It is most effective to reduce floor impact noise as close to the sound source as possible. In apartments, there are multiple layers in the floor system, from floor finishing to the structural concrete slab. Apart from the floor finishing, mortar lies at the top layer of the floor system, followed by autoclaved lightweight concrete, insulation, and the concrete slab. The present study aims to identify the reduction characteristics of light and heavy floor impact noises by changing the glass transition temperature of an SBR (styrene–butadiene rubber) latex mortar. To achieve this, structural tests were undertaken to find the appropriate mix proportions of SBR latex in the mortar, meeting the glass transition temperature based on the physical test results regarding the latex mortar. As seen in the study method and process, because this study aimed to both increase and decrease the strength compared to general mortar, a 7% mixture ratio of Tg 4 °C SBR latex was decided upon for the strength increase, while a 5% mixture ratio of Tg −16 °C SBR latex was chosen for the strength reduction. A mock-up specimen was created using the SBR latex-modified mortar according to the identified mix proportions, and the characteristics of light- and heavy-weight floor impact noises of the SBR latex-modified mortar were then examined. Comprehensive analysis of the reduction performance of the floor impact noise revealed that the Tg −16 °C SBR latex-mixed mortar showed a reduction effect of about 2–5 dB for light-weight impact noise and about 7–10 dB for heavy-weight impact noise.

show abstract

Floor Impact Noise Characteristics Depending on the Experimental Conditions Using Impact Ball

Cited by 5 publications

References 0 publications

Impact Sound Reduction Performances of Additional Floor Mats for the Retrofitting of an Existing Apartment Building in Accordance with Test-Bed Conditions

Impact Sound Reduction Performances of Additional Floor Mats for the Retrofitting of an Existing Apartment Building in Accordance with Test-Bed Conditions

The calibration device research for assessing the impact exposure level of rubber balls in architectural acoustics

The Improvement in the Floor Impact Noise with Changes in the Glass Transition Temperature of an SBR Latex Mortar

Contact Info

Product

Resources

About