Development of the Sound Metric for the Impact Sound of a Car Using Wavelet Transform

2009 ◽  
Author(s):  
Eun Woo Na ◽  
Ho-Wuk Kim ◽  
Sang Kwon Lee
Keyword(s):  
Wavelet Transform ◽  
Sound Level ◽  
Quality Characteristic ◽  
Subjective Rating ◽  
Passenger Cars ◽  
Impact Noise ◽  
The Mean ◽  
Sound Metric ◽  
High Level ◽  
The Impact

Vehicles experience the impact due to harsh road conditions. Contact with a barrier on a road induces vehicles to vibrate, which brings about impact noise of high sound level. The attenuation of impact noise is an important issue since car passengers may complain about the impact noise. However, Perfect removal of impact noise is not possible as most of impact noise is caused by external conditions. It is thus necessary to make vehicles to possess more desirable sound quality characteristic of impact sound. More research is needed on objective attributes of impact noise; it is not a simple matter since impact noise is transient in nature and has a high level of sound at an instantaneous moment. A new objective attribute of impact noise is designed by using wavelet transform. Wavelet transform is appropriate for the analysis of transient signals such as impact noise. The usefulness of new objective attribute, which is a sound metric, is examined by comparison with the mean subjective rating for real impact noise of passenger cars. The new sound metric has better correlation with the mean subjective rating than already existing sound metrics.

scholarly journals An intervention of physical activity promotion in an university hospital. A prospective cohort study

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
J Ladner ◽  
S D Mihailescu ◽  
D Cerasuolo
Keyword(s):  
Physical Activity ◽  
Health Workers ◽  
Public Health Intervention ◽  
Physical Activity Promotion ◽  
University Hospital ◽  
Activity Promotion ◽  
The Mean ◽  
High Level ◽  
The Impact

Abstract Background Rouen University Hospital implements a policy of health promotion hospital since 2016. The objective of this study was to evaluate prospectively the impact of physical activity promotion in hospital health workers (HW), using pedometers over a period of six months. Methods Physical activity was measured by electronic pedometers distributed to HW, with the aim to improve their physical activity and to measure it during six months. Online questionnaires collected at different points of follow-up, from inclusion to sixth month (a total of seven points of follow-up). Socio-demographic and characteristics on type of health work were collected as well as the number of steps and the behavior regarding their routine physical activity. Results A total of 680 HW were included in the cohort. The sex ratio M:W was 0.16. The mean age was 41.6 years (SD = 10.7). 44.0% were non-medical caregivers, 32.1% were in administrative section, 14.3% were technical workers and 9.7% were physicians or pharmacists; 53.7% of HW reported doing sport regularly. At inclusion the mean number of daily steps was 8662. The mean progression for all professional profiles between first week and sixth month was of 1082 steps daily, with difference according to position: 1319 in physicians, 1234 in non-medical caregivers, 1106 in administrative workers and 314 in technical workers. In linear regression model, the mean number of progression of daily steps was 964 in physicians, 752 in non-medical caregivers. Conclusions The study shows a significant increase in the number of daily steps measured objectively using an incentive tool, as pedometer during six months of intervention. Further researches are needed to determine if these changes are sustainable over a long period of time Key messages Despite high level of daily steps at baseline, the longitudinal study shows an increase of daily steps over a 6-month period. Such public health intervention is a relevant method to engage people in self-monitoring their physical activity.

scholarly journals RESEARCH ON EMERGING AND DESCENDING AIRCRAFT NOISE / KYLANČIŲ IR BESILEIDŽIANČIŲ ORLAIVIŲ KELIAMO TRIUKŠMO TYRIMAI

2013 ◽  
Vol 5 (4) ◽  
pp. 337-342
Author(s):  
Monika Bartkevičiūtė ◽  
Raimondas Grubliauskas
Keyword(s):  
Negative Impact ◽  
Traffic Noise ◽  
Aircraft Engine ◽  
Sound Level ◽  
Aircraft Noise ◽  
Large Radius ◽  
Sound Levels ◽  
Conducting Research ◽  
High Level ◽  
The Impact

Along with an increase in the aircraft engine power and growth in air traffic, noise level at airports and their surrounding environs significantly increases. Aircraft noise is high level noise spreading within large radius and intensively irritating the human body. Air transport is one of the main sources of noise having a particularly strong negative impact on the environment. The article deals with activities and noises taking place in the largest nationwide Vilnius International Airport.The level of noise and its dispersion was evaluated conducting research on the noise generated by emerging and descending aircrafts in National Vilnius Airport. Investigation was carried out at 2 measuring points located in a residential area. There are different types of aircrafts causing different sound levels. It has been estimated the largest exceedances that occur when an aircraft is approaching. In this case, the noisiest types of aircrafts are B733, B738 and AT72. The sound level varies from 70 to 85 dBA. The quietest aircrafts are RJ1H and F70. When taking off, the equivalent of the maximum sound level value of these aircrafts does not exceed the authorized limits. The paper describes the causes of noise in aircrafts, the sources of origin and the impact of noise on humans and the environment. Article in Lithuanian. Santrauka Padidėjus orlaivių variklių galiai ir daugėjant skrydžių, labai padidėjo oro uostuose ir šalia jų esančiose apylinkėse skleidžiamo triukšmo lygis. Lėktuvo keliamas triukšmas išsiskiria aukštu garso slėgio lygiu bei dideliu spinduliu sklindančiu garsu ir yra labiausiai dirginantis žmogaus organizmą. Orlaivių transportas – vienas pagrindinių triukšmo šaltinių, darantis ypač didelę neigiamą įtaką aplinkai. Nagrinėjamas Tarptautiniame Vilniaus oro uoste kylančių ir tupiančių orlaivių keliamas triukšmas. Triukšmo tyrimai atlikti gyvenamojoje aplinkoje greta oro uosto parinktose matavimo vietose. Pateikiami įvairių orlaivių tipų sukeliamo garso stiprumo – garso slėgio lygiai. Didžiausias leistinųjų verčių viršijimas nustatomas orlaiviams leidžiantis. Triukšmingiausi B733, B738 ir AT72 tipo orlaiviai – garso slėgio lygis 70–85 dBA. Vieni tyliausių orlaivių – RJ1H ir F70. Jiems kylant ekvivalentinės ir maksimalios garso slėgio lygio reikšmės neviršija leidžiamųjų. Aprašomos orlaivių keliamo triukšmo priežastys, kilimo šaltiniai. Nagrinėjamas triukšmo poveikis žmogui ir aplinkai.

scholarly journals Vulnerability analysis toward river flooding in the Comal Watershed, Indonesia

2021 ◽  
Vol 325 ◽  
pp. 01022
Author(s):  
Yunus Aris Wibowo ◽  
Muh Aris Marfai ◽  
Muhammad Pramono Hadi ◽  
Lintang Ronggowulan ◽  
Puspita Indra Wardhani
Keyword(s):  
Social Economic ◽  
Vulnerability Analysis ◽  
Large Area ◽  
Watershed Area ◽  
River Flooding ◽  
The Mean ◽  
High Level ◽  
National Disaster ◽  
Spot 5 ◽  
The Impact

River flooding is a disaster that almost every year hits the downstream Comal watershed. This incident resulted in material, psychological, and even casualties. Therefore, a vulnerability analysis is needed to reduce the impact of flooding. This study aims to analyze the vulnerability to river flooding in the downstream Comal Watershed area, Indonesia. Vulnerability variables used are social, economic, physical, and ecological (environmental) vulnerability following the Indonesian National Disaster Management Agency (BNPB) Regulation 2012. Data were obtained from government agencies and interpretation of SPOT 5 satellite imagery. Data analysis were carried out using scoring and weighting. Moreover, the data classification were using the mean and standard deviation equations. The analysis showed that the vulnerability to river flooding in the Comal watershed area was dominated by a moderate vulnerable class of 10,832.15 hectares (49.69%) and distributed in 26 villages. Furthermore, the high level of vulnerability also covered a large area by 8,773.11 hectares (40.24%), and distributed across 29 villages. Therefore, proper river flooding mitigation planning with the characteristics of the area is needed.

Impact of SARS-CoV-2 pandemic on bariatric patients in Podlaskie Voivodeship in Poland

2021 ◽  
Vol 93 (6) ◽  
pp. 1-5
Author(s):  
Agnieszka Popławska ◽  
Joanna Jamiołkowska ◽  
Paulina Woźniewska ◽  
Krzysztof Drygalski ◽  
Urszula Kościuczuk ◽  
...  
Keyword(s):  
Mean Value ◽  
Demographic Characteristics ◽  
Bariatric Procedure ◽  
First Case ◽  
Risk Of Mortality ◽  
Significant Difference ◽  
Bariatric Patients ◽  
The Mean ◽  
High Level ◽  
The Impact

Background: The first case of COVID-19 (Coronavirus Disease 2019) in Poland was reported on March 4th, 2020 and resulted in cancellation of bariatric procedures during the lockdown in Poland. The lockdown caused difficult access to all means of medical care. The study was conducted show the impact of SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus) pandemic on bariatric patients’ status in one of Polish regions. Methods: The survey was designed and distributed to bariatric patients. The questionnaire was divided into two parts: demographic characteristics of participants and part concerned the impact of the pandemic on bariatric patients. Results: 116 bariatric patients participated in the survey. 109 of them (94%) reported at least one accompanying disease. The mean value of the willingness to perform the bariatric procedure among women it was 8.8 (±2.2 SD) and men 8.5 (±2.3 SD). The mean value of the impact of SARS-CoV-2 pandemic on the willingness to perform the bariatric in the group of women was 3.0 (±3.0 SD) and in the group of men - 3.2 (±3.0 SD). Statistical analysis shows that there is no statistically significant difference between those date. Conclusions: Despite the pandemic and higher risk of mortality and complications after COVID-19 infection, bariatric patients declare the high level of willingness to perform the bariatric procedure and the impact of SARS-CoV-2 pandemic does not play an important role in a process of deciding to undergo the bariatric procedure. Delay of surgery can significantly increase the disease load in these patients, so cancelling or postponing treatment is not advisable.

scholarly journals Quality of life in patients rehabilitated with implant-supported prostheses

2017 ◽  
Vol 16 ◽  
pp. 1-9
Author(s):  
Anderson Nicolly Fernandes-Costa ◽  
Micaella Pollyana Silva do Nascimento Costa ◽  
Tâmara Cabral Rodrigues ◽  
Karyna de Melo Menezes ◽  
Patrícia dos Santos Calderon ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Functional Limitations ◽  
Physical Pain ◽  
Significance Level ◽  
The Mean ◽  
Predominantly Female ◽  
High Level ◽  
The Impact ◽  
Single Crowns

Purpose: To evaluate the impact of rehabilitation with implant-supported prostheses on the quality of life (QoL) of patients. Methods: The OHIP-14 questionnaire was applied to 114 patients and information regarding gender, age, type of prosthesis and time of use were obtained. To analyze whether there were any statistically significant differences between the mean scores of the seven parameters of the OHIP-14, the Mann-Whitney and Kruskal-Wallis test were used. All data were evaluated using a significance level of 5%. Results: Patients were predominantly female (78.9%) and single crowns users (41.2%). Patients reported a good QoL (3.07). Psychological discomfort and physical pain were the worst dimensions evaluated by the subjects. Results differed significantly (p<0.05) only for functional limitations and psychological discomfort in the different genders. Conclusions: Patients presented a high level of quality of life, regardless of age, duration of use and the type of prosthesis used. However, women presented more psychological distress and functional limitations than men.

scholarly journals AB0673 THE ROUTINE HEALTH CARE OF PATIENTS WITH RHEUMATIC DISEASES DURING THE PANDEMIC OF COVID-19

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 1368.2-1368
Author(s):  
S. Mariem ◽  
M. Yasmine ◽  
S. Miladi ◽  
A. Fazaa ◽  
L. Souebni ◽  
...  
Keyword(s):  
Health Care ◽  
Rheumatic Diseases ◽  
Treatment Modalities ◽  
Protective Measures ◽  
Impact Of Event Scale ◽  
Event Scale ◽  
The Mean ◽  
Hospital Visits ◽  
High Level ◽  
The Impact

Background:The coronavirus pandemic poses a great threat to patients with rheumatic diseases (RD). Because of the state of immunodepression, they are perceived as vulnerable and at high risk of contracting the virus. This may lead to a delay in the health care routine.Objectives:The aim of our study was to assess the routine of patients with rheumatic diseases in the era of covid-19.Methods:We conducted a prospective study after the outbreak of Covid-19 including patients with RD: rheumatoid arthritis (RA) and Spondylarthritis (SpA). All of them were invited to answer a questionnaire about adherence to protective measures, health services, hospital visits, treatment modalities, as well as the level of satisfaction with the medical support or information received for COVID-19. We also evaluated the post-traumatic state (PTS) with the Impact of Event Scale-Revised (IES-R). A cut-off point fixed at 33 provided the best diagnostic accuracy for PTS. The level of significance was fixed at 0.05.Results:The study included 60 patients with a female predominance (sex ratio=1.7). The mean age was 51.3 ± 13.1 years [18-75] and the mean disease duration was 11.9 ±5.6 [1-23] years. Forty-two patients had RA and 18 patients had SpA. The majority of respondents were women (63.3%), married (81.7%), with a household size of 3–5 people (67.9%). The mean DASS depression and anxiety subscale was 9.5 ±7.6 [2-32] and 12.6 ± 8.2 [1-35] respectively. PTS was found in 25% of cases. Twenty-two patients stopped working in the second outbreak. The adherence to protective measures was as follows: compliance with lock-down (92.5%), adherence to stay home warnings (82%), wearing masks (96.3%), social distancing (68%), and washing hands immediately after sneezing (59.3%). Information was mainly sourced from both social media and the Internet in 78.2% of cases. Most of the patients were satisfied with the information provided and only 5 demanded more information about vaccination protocol. Of the patients having direct contact with a person affected with Covid-19 (20%), seven patients experienced symptoms. Three patients were diagnosed with SARS-COV2 and three other patients were hospitalized because of flares. The majority of the respondents (98.2%) had confidence in their own doctors’ ability to recognize Covid-19. The majority of patients (91%) were afraid of getting sick and 83.1% feared stigma and discrimination after the infection. Fifty patients did attend their consultation appointment and 13.3% had a phone consultation. About a third of patients (26.7%) of patients experienced a delay in treatment. A positive correlation was found between marital status and the fear of other family members getting Covid-19 (p=0.029). Patients who did not consult experienced more PTS and severe anxiety than those who did not delay hospital visits (p=0.07, p=0.04 respectively).Conclusion:Our study showed that during the outbreak of Covid-19, patients with RD exhibited a high level of protection towards the virus. Despite these precautionary measures, a delay in hospital routine was observed.Disclosure of Interests:None declared

Analysis of Impact Noise of Nail Ejection in Wire Nail Machines

1999 ◽  
Author(s):  
Jack Ding ◽  
Ahmed Al-Jumaily ◽  
Doug Wilson
Keyword(s):  
Sound Pressure ◽  
High Frequencies ◽  
Impact Noise ◽  
Press Forming ◽  
Large Force ◽  
Ejection Force ◽  
Sound Pressure Levels ◽  
High Level ◽  
The Impact ◽  
Punch Press

Abstract A wire nail production machine can be classified as one of the punch press machines. By nature, the production of wire nails involves the development of a series of force impulses which in turn generate various sound pressure levels with different frequencies. Typically, the machine operations generating impact noise include pressing, cutting, ejecting, wire gripping and feeding. The punch pressing is the movement of punch header to press forming the nail head. It produces a large force impulse which in turn generates a high level of impact noise and consequently high levels of ancillary impact noise such as the impact noise by the backlashes. It has been found that this type of impact noise is not necessarily the most annoying one. The impact noise generated by nail ejection, however, has been identified as one of the annoying noise components. The ejector used in a nail machine for executing the movement of nail ejection produces ringing noise at high frequencies when it is struck by the punch header in each cycle of the machine operations. This paper presents the analyses of and experiments on the ejection force impulse and the characteristics of the impact noise generated by nail ejection.

Effect of Acoustic Pads' Different Dynamic Stiffness on the Reduction of Impact Sound Level

2014 ◽  
Vol 899 ◽  
pp. 491-494 ◽  
Author(s):  
Lenka Autratová ◽  
Petr Hlavsa
Keyword(s):  
Optimal Design ◽  
Transmission Loss ◽  
Dynamic Stiffness ◽  
Sound Level ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Acoustic Insulation ◽  
Impact Noise ◽  
Floor Structure ◽  
The Impact

Impact sound transmission loss is the ability of structure to absorb impact noise, which is formed by mechanical impulses (steps, falls). The impact noise is then spread to the elements connected to the floor structure, such as the ceiling and surrounding wall. Dynamic stiffness is one of the important parameters that affect the sound insulation of ceiling structures with floating floors. The article deals with the optimal design of acoustic insulation to the floor composition, combining different materials of various thicknesses with various characteristic properties.

scholarly journals SUGGESTIONS ON CORRECTION OF PROCEDURES REGULATING FULFILLMENT OF NOISE METERING AND VIBRATION METERING TESTS OF PASSENGER CARS

2020 ◽  
Vol 2020 (7) ◽  
pp. 39-47
Author(s):  
Vladimir Liferenko
Keyword(s):  
Health State ◽  
Passenger Cars ◽  
Time Saving ◽  
Labor Conditions ◽  
Vibration Impact ◽  
Motion Speed ◽  
Speed Up ◽  
Definition Of ◽  
High Level ◽  
The Impact

The work purpose is the development of suggestions on the improvement of labor conditions for passenger car conductors. In the paper there is shown information on conductor health, diseases connected with the vibration high level impact. On the basis of the experience of CC SA “TIV” for the solution of the problem specified there are introduced suggestions on changes of the standard base regulating the fulfillment of noise metering and vibration metering test. The expediency of the changes offered is also substantiated with the potential of modern instrument-ware. The absence of the necessity for the definition of vibration indices at a motion speed up to 80 km/h is shown. A possibility to obtain objective data on vibration processes in a car during measures with the 20 km/h intervals is called into question. A regularity connecting the frequencies of dominating vibration with the speed of a car motion is determined. There are given specific recommendations on the adjustment of procedures to obtain reliable information on noise and vibration perceived by passengers and service personnel. It is emphasized that maximum noise levels arise at maximum vibration levels therefore there is drawn a conclusion on the expediency of the synchronization of these tests. On the basis of the material presented in the work the following conclusions are drawn: in the resent years are not observed improvements in conductor morbidity rates connected with the impact of vibration higher levels; on the consequences of vibration impact upon passengers it is possible to judge by a health state of conductors; the introduction of the changes offered will result also in time saving and cost decrease of test fulfillment.

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