SUMMARY OF APPLIANCE dB(A) NOISE LEVELS
Noise spectra of eighteen commonly-used household appliances are given, up to ten models of each type being studied. Measurements were taken in acoustically-simulated average domestic rooms and in situ.The present paper is confined to a study of appliance noise levels over which the user can exercise little or no direct control. This excludes telev...
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OBJECTIVES: We analyzed tornado-related injuries seen at hospitals and risk factors for tornado injury, and screened for post-traumatic stress following a statewide tornado-emergency in Alabama in April 2011. METHODS: We conducted a chart abstraction of 1,398 patients at 39 hospitals, mapped injured cases, and conducted a case-control telephone sur...
... To test the LDV, we placed nine plastic bottles as vibrating objects at 1 m intervals in all directions and detected the best object, i.e. with the highest confidence score, using the proposed approach in Section 3.2. In this experiment, we prepared the following two noise types: (i) the sound of flowing water in a sink with a sound pressure level of about 70 dBA, which corresponds to usual housework , such as washing hands and dishes, and (ii) the noise generated by home appliances around the robot. Specifically, the latter includes white noise and fan noise with three sound pressure levels of 65, 75, and 85 dBA. ...
Domestic robots are often required to understand spoken commands in noisy environments, including service appliances' operating sounds. Most conventional domestic robots use electret condenser microphones (ECMs) to record the sound. However, the ECMs are known to be sensitive to the noise in the direction of sound arrival. The laser Doppler vibrometer (LDV), which has been widely used in the research field of measurement, has the potential to work as a new speech-input device to solve this problem. The aim of this paper is to investigate the effectiveness of using the LDV as an optical laser microphone for human-robot interaction in extremely noisy service environments. Our robot irradiates an object near a speaker with a laser and measures the vibration of the object to record the sound. We conducted three experiments to assess the performance of speech recognition using the optical laser microphone in various settings and showed stable performance in extremely noisy conditions compared with a conventional ECM.
... The noise caused by electrical home appliances has been considered a serious problem . Ref.  examined the noise originating from home appliances. They found that kitchen appliances are generally noisier than other appliances, with noise levels in the range 40-90 dB, approximately. ...
Real-time collection of household electricity consumption data has been facilitated by an advanced metering infrastructure. In recent studies, collected data have been processed to provide information on household appliance usage. The noise caused by electrical appliances from neighboring households constitutes a major issue, which is related to discomfort and even mental diseases. The assessment of noise discomfort using electricity consumption data has not been dealt with in the literature up to this day. In this study, a method that utilizes electricity consumption data for the assessment of noise discomfort levels caused by electrical appliances between neighboring households is proposed. This method is based on the differences in the usage time of electrical appliances in a collective residential building. The proposed method includes the following four steps: data collection and preprocessing, residential units clustering, noise discomfort modeling, and evaluation of noise discomfort. This method is demonstrated through a case study of a campus apartment building. Variations in the noise discomfort assessment model and measures for alleviating noise discomfort are also discussed. The proposed method can guide the application of electricity consumption data to the assessment and alleviation of noise discomfort from home appliances at an apartment building.
... The control of low frequency audible air-borne noise produced by, for example, aircraft  or home appliances  is an important engineering task. ...
The metamaterial under investigation here consists of a periodic arrangement of unit plates in a grid-like frame such that there is a contrast in the local areal mass between cell interior and cell wall. In the low frequency range and under normal incidence this metamaterial panel exhibits a sound transmission loss significantly larger than the transmission loss of an unstructured panel with the same homogeneous mass per unit area. However, when the incident sound field is diffuse, the relative advantage of the metamaterial barrier is reduced or eliminated. A sequence of experiments is documented to demonstrate that the relative advantage of the metamaterial barrier can be realized even in a diffuse sound field by creating a hybrid barrier system which embeds the metamaterial layer between a normalizing waveguide layer on the incident side and an absorbing layer on the transmitted side. The sound normalizing waveguide layer is a lattice structure, and the absorbing layer is high performance glass fiber mat. By using measurements of the transmission loss of a 1.2 m square panel system the role of each of these components is demonstrated.
... A survey from the 1970s reports on the noise spectra of typical home appliances. 5 It is reasonable to assume, however, that new noise sources in dwellings have appeared since, such as modern home audio systems or some new home appliances, while old ones have been technologically improved. As a result, the spectrum of typical noise in dwellings might have changed to a greater or lesser degree since the reference spectra were initially defined several decades ago. ...
A standard proposal for rating airborne sound insulation in buildings [ISO 16717-1 (2012)] defines the reference noise spectra. Since their shapes influence the calculated values of single-number descriptors, reference spectra should approximate well typical noise spectra in buildings. There is, however, very little data in the existing literature on a typical noise spectrum in dwellings. A spectral analysis of common noise sources in dwellings is presented in this paper, as a result of an extensive monitoring of various noisy household activities. Apart from music with strong bass content, the proposed "living" reference spectrum overestimates noise levels at low frequencies.
Minimal sound insulation between dwellings is defined on (1) maximum permissible noise level and (2) expected sound level in neighbor dwellings. This paper is concerned with analysis of sound levels generated in everyday human activities in dwellings. The analysis was based on signals recorded in dwellings during expected daily maximum of domestic activities. The recordings were made with a standard measuring microphone and portable digital recorder. In each room a microphone was positioned at a point outside the zone of direct sound. The results of wideband analysis in 15 minutes intervals are presented. The results can be used for evaluation of classification scheme in sound insulation between dwellings.
It has been shown previously that a panel comprising a cellular array can yield a normal incidence transmission loss in a specified low frequency range that is significantly larger than that of a homogeneous panel having the same mass per unit area. The cellular metamaterial considered consists of a periodic arrangement of unit plates held in a grid-like frame. However, when the incident sound field is diffuse, the relative advantage of the metamaterial barrier is reduced or eliminated. Here it will be shown through a sequence of experimental measurements that the relative advantage of the metamaterial barrier can be restored by creating a hybrid system consisting of a layer applied to the front surface of the material that causes sound to approach the barrier at normal incidence, and a layer on the rear surface of the material that compensates for the transmission loss minimum that normally follows the peak in a metamaterial barrier transmission loss. In the implementation considered here, the front layer consists of a lattice structure, and the rear layer consists of high performance glass fiber. The role of each of these components will be illustrated using measurements of transmission loss of a 1:2 m square panel system.
The concept of sound character is introduced as a physical attribute responsible for any systematic differences in annoyance due to different sounds at the same A-weighted equivalent sound level. It is thought that this sound character is more important at low sound levels than at high ones. A pilot experiment with refrigerator sounds indicated a clear effect of sound character. In particular, sharp onsets were shown to worsen the character of such sounds.
Results of a field survey of 98 subjects have been analysed and sound isolation measures have been compared to establish the influence of residential noise levels and non-acoustical factors on subjective judgements. A procedure is considered for estimating the properties of an ideal wall. Les résultats d'une étude in situ réalisée auprès de 98 ménages ont été analysés et des mesures d'isolation acoustique ont été comparées en vue de déterminer l'influence des niveaux de bruits et de facteurs non-acoustiques dans une habitation sur l'opinion subjective. Une méthode est envisagée pour évaluer les propriétés du mur idéal. RES
The noise levels produced by a variety of do-it-yourself power tools were measured in a real-life situation. Most of the devices tested produced noise of 100 dB(A) or greater at the user's ear. A questionnaire was issued to 100 males who used these devices. The vast majority used the devices infrequently and therefore are unlikely to be directly at risk of hearing damage. A group of users who may be more at risk from using power tools in the home are those who are, or have been exposed to occupational noise.