Noise Meter Research Articles

Monitoring Experiment of Melon Greenhouse’s Environment in Tropical Climate

Greenhouses in tropical climates are designed to control passively the environment, protecting plants from pest and extreme climate condition, which is increasingly important due to climate change. This research aims to monitor a melon greenhouse's environment in a tropical climate to understand light intensity, pollutants, and climate conditions. Indoor and outdoor conditions of melon greenhouse were real-time monitored by Vantage VUE model, DAVIS weather station, PM2.5 meter and noise meter. The findings examined that peak light intensities were recorded at 135,600 lux outdoors and 32,050 lux indoors at noon, with an average light transmittance of 38%. Additionally, PM2.5 levels remained stable around 26-30 µg/m³, and sound levels decreased from 60 dB in the morning to 45 dB. These pollution levels did not disturb farmer and indoor melon in winter season. However, other seasoning period needs to be monitored for long term adaptation of application and climate change mitigation. These research findings will support greenhouse design for human comfort and plant growth, considering and optimizing temperature and humidity conditions. IoTs mechanisms and devices were proposed high costly potential for monitoring sensor, networking process, comparative and reliable data collection for further next step of greenhouse integration. Lastly, upcycled transparent roof from LDPE were suggested to be continually used with minor development or plug-in devices for increasing light shade during the mid-daytime.

Investigation of Noise Induced Hearing Loss Among Power Loom Industry Workers in Tamil Nadu, India.

Noise-induced hearing loss remains a prevalent occupational concern across various industries. This study aimed to address several key objectives regarding noise exposure and hearing impairment among power loom workers in Tamil Nadu, India. The major objectives were to assess the levels of noise exposure in the power loom industry and to determine the prevalence of hearing loss among the workers. The minor objectives included identifying the specific factors associated with hearing loss and proposing measures to mitigate noise exposure. A cross-sectional study was carried out at a Power Loom Industry in the Erode District of Tamil Nadu between September and November 2023. A total of 123 workers from weaving sections were randomly selected to participate in face-to-face interviews using a structured questionnaire. Noise exposure levels were measured using a noise meter, while hearing loss was assessed using a pure tone audiometer. Logistic regression analysis was conducted to identify factors associated with hearing loss. Among the workers, 88.5% were exposed to noise levels of ≥ 95dB (A), and the prevalence of hearing loss was 71.6%. Factors positively associated with hearing loss included age between 31-50years and over 50years, lack of literacy, experiencing hearing difficulties or earaches, hypertension, and more than 15years of service in the power loom industry. To mitigate noise exposure levels, there is a need for enhanced occupational hazard education and stricter enforcement of safety regulations. Regular audiometry tests should be implemented to monitor hearing threshold shifts. Employers should establish and enforce hearing conservation programs in workplaces where noise exposure exceeds or reaches 95dB (A).

Comparison of amount of noise and elimination strategies for noise in neonatal intensive care units of government and private hospitals in the Jodhpur district of India.

With technological advancement, neonatal intensive care units (NICUs) have become noisier than ever. Studies have shown the detrimental effects of increasing noise in NICU on growing pre-term and sick neonates. The present study aimed primarily to compare the amount of noise in NICUs of private and government hospitals. The secondary aim was to compare the strategies adopted by these hospitals to control the detrimental effects of noise on newborns. A detailed noise survey was conducted in the NICUs of two private and two government hospitals in the Jodhpur district, India. The noise survey was performed for a duration of 48 h using "Sound Ear 3-300" noise meters. The analyses were measured in Leq (equivalent continuous sound level) A-weighted decibels (dBA). The extracted data analysis revealed that the noise measured was in the range of 61.62-82.32 dBA in four NICUs of the district. The results also revealed a statistically significant difference between the NICU noise of private and government hospitals. The levels of alarming sounds differed between the hospitals with a general trend of lesser alarming sounds in private hospitals. The major differences in strategies adopted were that both private hospitals had a protocol to purposely reduce levels of alarming sounds when heard, and purposely limited the number of staff present in certain areas of the NICU, which were correlated with reduced sound compared to the government hospitals. Strategies like these require no additional cost to make drastic changes in the average noise measured.

Analysis of Noise pollution level in Enugu campus, of the University of Nigeria

Noise is sound of any kind that is undesirable and unwanted as part of the environment under consideration. It is one of the types of pollution that have great impact on our health and wellbeing. The occurrence of noise in our environment is increasing daily because of growing population and industrialization. Noise pollution have great consequences on our social and economic lives especially in teaching and learning environment, which is presumed to be in silent zone. It is worth investigating whether environment in which teaching and learning take place is in quiet condition? The aim of the study was to analyze the level of noise pollution at different locations in the University of Nigeria, Enugu Campus. The Nigeria Standard noise level for higher education institutions and hospitals should be 60 dB for day and 50 dBA for night. The Noise levels dBA was measured with the help of noise meter at 14 points and at a height of 1 m above the ground level within the campus at three different times (6–8 am, 12–2 pm and 4–6 pm). The total Leq noise level in the University of Nigeria, Enugu Campus is 70.94 dBA which is above the level recommended for educational institutions. The period of intensity of noise was recorded during afternoon, morning and evening respectively. This rate of noise level during the day is high and unsuitable for teaching-learning process. Therefore, university management should take proactive measures to regulate noise pollution within the campus and indeed, other university campuses in Nigeria.

Real-time Noise Risk Assessment as Preventive Action to Occupational Disease in A Pharmaceutical Industry

Noise is a form of dangerous exposure that occurs around humans because of sound sources from industrial machines, work equipment, alarms, transportation equipment, etc. Continuous exposure to noise with noise levels higher than 85 dBA can lead to psychological and psychological health problems. The aim of this research is to identify the intensity of noise in the pharmaceutical industry and to map the noise to humans. Noise evaluation began by conducting a survey of conditions on the production floor by arranging a production floor layout accompanied by the location of machines and other work facilities. The next step was to determine the size and number of networks that would help in identifying interference measurement points. It took around 100 points to identify interference and then measurements were carried out using a noise meter with 6 repetitions per point. The equivalent continuous sound pressure level (Leq) was calculated first before being used as input to the Surfer software to obtain interference on the production floor. The research results showed that there were 100 points spread across 12 workstations in this drug manufacturing industry. The results showed that there were 19 points that received interference ≥ 85 dBA. The areas with the biggest disturbances were the EPM machine area, spooling machine, and slitting room.

DEVELOPMENT OF GENERAL REQUIREMENTS FOR TRACKED AND WHEELED EQUIPMENT NOISE DETERMINATION DEVICE

In the work, an analysis of the existing requirements for the noise of wheeled and tracked machinery, an analysis of existing methods of noise assessment, an analysis of existing requirements for noise detection devices, and also the general requirements for a device for determining the noise of tracked and wheeled vehicles, used during tests by developers (manufacturers) of defense goods in Ukraine. The purpose of the article is to improve the laboratory-testing base of the Armed Forces of Ukraine (hereinafter referred to as the Armed Forces of Ukraine) by equipping it with modern test equipment, which will allow obtaining quantitative values of characteristics (parameters) that are subject to evaluation during tests of weapons and military equipment (hereinafter referred to as OMT) and their components The method of conducting research is the theory of system analysis, synthesis of organizational and technical systems, comparison, generalization. The characteristics of the specified device and configuration options are considered. The main parameters for assessing the noise level of automotive and armored vehicles, which are subject to registration (measurement), have been determined. Methods of noise level assessment are considered. The results of the work can be used when choosing a noise meter to solve the tasks of testing, to determine the acoustic visibility of OVT and to meet the requirements of environmental protection.
 The practical significance of the obtained results lies in the provision of tests, in particular, of military equipment on tracked or wheeled chassis.

Noise survey of neonatal intensive care unit at a government tertiary-care centre.

With technological advancement, Neonatal Intensive Care Units (NICU) have become noisier than ever. Studies have shown the detrimental effects of increasing noise in NICU on growing pre-term and sick neonates. The present study aimed to survey the amount of noise in one of the NICU blocks of a government tertiary care centre and explore ways to control it when dealing with these sick babies. A detailed noise survey was carried out, for February 2023, in one of the two blocks of NICU in a government tertiary-care centre. The noise measurements were performed using two "Sound Ear 3" noise meters. The analyses were done in Leq (equivalent continuous sound levels) A-weighted decibels (dBA). The extracted data analysis revealed that the NICU block was exposed to a mean Leq of 67.78 dBA noise with a maximum of 89.0 dBA. There was a significant difference between the values noted in devices at different locations and across different periods. There were certain instances (57 and 42 for two devices) when there were sudden spikes in the noise levels beyond 80 dBA. It was also seen that noise was more than 65 dBA most of the time (72% and 66% for the two devices). The noise survey carried out over one month revealed a considerable amount of noise in the NICU of a government tertiary-care centre. The study also explored ways such as environmental modification, human behavior modification, awareness programs, and neonatal-centered modifications to reduce the noise and lower its detrimental effects on the growth of neonates.

A Study on Assessment of Noise Levels in Various Construction Activities

Construction industry is one of the occupational hazardous workplaces. Most of the construction activities are involved with various risks, prone to occupational hazards. Noise is a physical hazard, resulting from simple headache to permanent hearing loss. Noise is not only confined to work involved but also involves surrounding activities like traffic, commercial activities of the construction sites. Each construction activity is associated with various tools, machinery, producing moderate to severe noise. Workers are exposed to repeated noise levels during worktime. The present study is to identify the machinery and tools producing high noise levels, calculating the average noise exposure levels, the dose levels pertaining to time weighted average levels during high work time. The survey, interview, observation based method adopted in collection and analysing the data .A collective number of noise levels were measured using Noise meter during the study . Ms excel sheet was used to analyse the dose levels and Time weighted average (TWA) . Construction activities exceeding the OSHA standards 85 dB, identified as noise hazard. Analysis concluded that concrete pouring activity produces a noise of 90 dB, exceeded the OSHA limit and carpentry activity just exceeds the limit. Based on survey 44.4% of the construction workers are responded as construction noise is not tolerable and 61.1% are not showing interest towards wearing of PPE.

Proliferation of noise pollution: Implication on health and community perception in coastal slums

Noise pollution's impact on human health and community perceptions is explored in this study. This study employed a mixed method approach, including survey, documentary, in-depth interviews, and noise meter measurements. Noise readings were measured at 15-minute intervals for each site using a precision-grade sound level meter. Descriptive and inferential statistics (SPSS version 20.0) and a geospatial information system-based Kriging technique (ArcGIS) were used for data analysis. The average mean value of noise levels (67.5 ± 3.0, 67.2 ± 2.2 75.0 ± 4.3, 66.7 ± 0.0 and 66.2 ± 2.2 dBA) from five locations exceeded WHO and NESREA standards of 65 and 55 during the day permissible limits in wet season; while during dry season (67.2 ± 5.8, 71.6 ± 0.7, 70.6 ± 0.0, 71.9 ± 0.0, 68.8 ± 0.0, 75.1 ± 0.0, 74.2 ± 0.2 and 79.4 ± 0.0 dBA) from eight locations surpass the recommended limits. Socio-demographic profiles showed that females were more impacted by noise pollution than males, and people between the age group of 40–59 years also expressed concern about noise pollution's impact. Additionally, 52.5, 42.5, and 40 % of the married respondents across the study area revealed high levels of proneness to noise pollution. Primary and secondary educational levels, as well as employment status (civil servant or unemployed), were identified as good predictors of noise-related health problems. Sources of noise pollution, as reported by the slum dwellers, include generator sets (37.5 %), religious worship centers (42.5 %), grinding machines and public address systems (60 %), moving vehicles (62.5 %), marketplaces (67.5 %), and motor parks (75 %).Contributory factors attributed to reported noise pollution levels are an increase in community population, duration of stay, and periods of extreme noise pollution. Perceived auditory and non-auditory health effects of noise exposure include hearing loss, hypertension, poor sleep quality, disturbances in mental health, nervousness, and myocardial infarction.Correlations were found between the reporting of noise impact and factors relating to the quality of life. Hence, 65% of those seeking better job opportunities and 75% of those seeking more affordable and cheaper living costs reported noise impact. Noise pollution performance measures, as reported, had connections between the respondents' attitude and knowledge. However, 67.5% indicated negative effects of noise pollution, 70% indicated reduction through creating awareness, and 72.5% reported reduction through government intervention. Therefore, this study emphasizes the importance of aggressive public education regarding the dangers of noise pollution to human health, as well as the strict implementation and enforcement of noise pollution laws.

Brief report: noise reduction in preschool from a self-regulated learning perspective-implementation of a game-based voice regulation training program.

An 8-week voice regulation training program (VRTP) incorporating everyday activities was implemented in an experimental preschool classroom (EG; n = 34), which was compared with a control preschool classroom (CG; n = 31). The VRTP includes songs, games, and conversations aiming to raise children's awareness of noise levels and teach voice modulation skills. Grounded in the theoretical framework of self-regulated learning, the study's objectives were to evaluate the impact of the VRTP on noise levels, children's self-regulation, and pre-literacy skills. Noise levels were assessed weekly using an electronic noise meter before and during the program. The EG preschoolers demonstrated modest but significant improvements over their pre-VRTP levels of voice modulation, behavioral and emotional self-regulated learning, and pre-literacy skills, in contrast with the CG children. The findings provide evidence that young children's self-regulation may be enhanced in preschool, challenging the field of developmental-educational psychology to consider self-regulated learning during early childhood.

Performance Evaluation of Data Utility for a Differential Privacy Scheme Supporting Fault Tolerance

The evolution of smart grids improves the sustainability, controllability, stability, and efficiency of traditional power grids. There is a challenging issue in smart grids with protecting users’ privacy while collecting and controlling individual fine-grained data. To ensure data integrity and address the privacy issue, differential privacy protection is an efficient method to resist differential attacks on aggregated data. However, due to differential noise and faulty smart meters, the problem of differential noise deviation has a great impact on the utility of aggregated data. In this paper, we further supplement the previous work by improving the prediction method, forming a relatively complete DP protection scheme (DPP-UFT) with fault tolerance, and providing a detailed performance evaluation process. The experimental results show that the proposed method of adding differential noise based on the estimated failure rate is related to the estimated failure rate and the noise factor. Compared with several other related literature, it has achieved a higher data utilization effect.

Cavitation Observation and Noise Characteristics in Rectangular Throttling Groove Spool

A hydraulic cavitation platform was developed in order to examine the occurrence of cavitation in the rectangular throttling groove spool and its correlation with noise characteristics. The test valve is constructed using PMMA material, which possesses excellent transparency. This transparency enables direct visual examination of cavitation occurring at the throttle slot. Additionally, high-speed photography is employed to observe the flow characteristics of the valve port, facilitating the analysis of cavitation morphology changes. Furthermore, a noise meter is utilized to measure and record the noise level and its corresponding spectrum. The flow field and flow phenomena at the rectangular throttling groove spool were studied using high-speed photography, noise spectrum analysis, and other methods. It is discovered that back pressure has the greatest influence on cavitation and flow separation, followed by the influence of intake pressure on cavitation morphology and noise. As the back pressure lowers, the cavitation morphology changes from flaky to cloudy, and the cavitation intensity, distribution area, and noise level increase. Background noise and cavitation noise have distinct frequency differences; cavitation noise in the rectangular throttling groove spool is high-frequency noise, with a frequency of more than 8 kHz, and the higher the frequency, the greater the difference in noise value. The magnitude of the alterations in noise intensity is minimal. The noise values exhibit slight variations of 2.3 dB, 4 dB, and 4.3 dB under varying back pressure circumstances of 3 MPa, 4 MPa, and 5 MPa inlet pressure, respectively. It is recommended to use the frequency of cavitation noise to detect the cavitation state and monitor the cavitation process. In the low-frequency region, the cavitation noise in the rectangular throttle groove valve core is not significantly different. Once the center frequency surpasses 3.15 kHz, a discernible distinction emerges, with the magnitude of the discrepancy in noise value increasing as the frequency rises. In other words, the cavitation cloud does not pulsate at one single frequency, but rather in a range of relatively high frequencies (more than 3.15 kHz).

THE ROLE OF MULTIMEDIA IN THE FORMATION OF PERFORMING SKILLS OF A BEGINNER FLUTIST

The article discusses multimedia applications that are the most appropriate for optimisation of the learning process in a flute classroom at the initial stage of training: Music Speed Changer, Master Flute Tuner, Metronome Beats, the Sound application, the noise meter application. The relevance of their usage is related to the specifics of the children of Generation Alpha, who currently make up the main contingent of students of children’s music and arts schools. According to the author of the article, the main task of introducing multimedia is to increase the effectiveness of classes in a systemic and systematic independent work aimed at the formation of a flutist’s performing skills, such as sound characteristics, phrasing, nuance, pitch intonation, sound milling, sound articulation, vibrato.

Noise pollution of container handling: External and abatement costs and environmental efficiency

While previous studies have pointed to their economic significance, terminal operations are frequently ignored in transport appraisal and policy analysis. This paper develops a generic model framework for estimating noise emissions from container terminal operations to derive key metrics for port policy analysis. A novel microeconomic production model that accommodates basic acoustics is proposed. Based thereon, abatement costs are derived using optimization and marginal external costs and efficiency scores are estimated using panel data frontier estimation. The virtues of the modeling approach are illustrated using noise meter readouts combined with port activity and meteorological data from the port of Oslo, Norway.

ЗАБЕЗПЕЧЕННЯ ПРАВА ГРОМАДЯН НА ЗАХИСТ ВІД ШКІДЛИВОГО ВПЛИВУ ШУМУ ТРАНСПОРТНИХ ЗАСОБІВ (СУЧАСНА РЕАЛЬНІСТЬ, БАЧЕННЯ НА ПЕРСПЕКТИВУ)

The goal. The purpose of the article is to determine the issue of protecting the population from theharmful and irritating effects of noise on the street and road networks of settlements and ensuring proper control over the observance of silence in public places and road safety. This article isobliged to highlight the issue of administrative and legal regulation of the use of technical meansby employees of the National Police of Ukraine, regarding the protection of citizens from theharmful effects of the noise of the vehicle exhaust gas emission system.Methods. The article uses the general scientific methodology of conducting legal research,including comparative legal, systemic structural, analysis and synthesis, deduction and induction,and other methods of scientific knowledge. Their use made it possible to determine and analyzethe current state of regulatory and legal regulation of the use of technical means of recordingoffenses by the police.Results. The article examines the problems of administrative and legal regulation of the useof technical devices for recording offenses by employees of the National Police of Ukraine.Considered, as an example, the possibility of using technical devices by employees of the NationalPolice of Ukraine to measure the permissible level of external noise (estimate the level of noise orsound by measuring the sound pressure) of vehicles with the help of a ‘noise meter’. The articlestates that the proper legal regulation of the use of technical devices by employees of the NationalPolice of Ukraine to measure and assess the noise level of the exhaust gas emission system ofvehicles is one of the determining conditions for the effectiveness of guaranteeing the right ofUkrainian citizens to protection against noise pollution. It is summarized that the experienceof implementing technical devices shows that the implementation of preventive measures issuccessful when the methods of persuasion are supported by legal norms that establish clearresponsibility for violations of established norms and standards.Conclusions. In order to ensure the legality of the use of technical devices, it is proposed tolegislatively update and provide for the grounds, order and conditions of their use by employeesof the National Police of Ukraine. It should be noted that this should be preceded by extensiveoutreach work among citizens of Ukraine, and primarily among drivers. Therefore, it is desirableto organize explanatory work with the participation of the first leaders of the patrol police ofUkraine in all mass media and social networks. And as a result, all this will encourage the creationof an atmosphere of understanding among drivers, regarding the necessity and legality of the useof devices for measuring the noise level by employees of the National Police of Ukraine.

Selected Indicators of Al-Najaf Road Network: Public Transportation Noise and Pollution

It is urgently necessary to improve the state of transportation and related infrastructure, especially given that the most important indicators of urban development gauge a city's progress. One of the most influential of these indicators is what is known as "smart transport, " which refers to transportation that utilizes modern communication and information technology technologies to address various challenges in various transportation sectors. The holy city of Najaf smart transportation strategy seeks to reduce dangerous levels of traffic-related noise and air pollution while enhancing various aspects of mobility and traffic flow indicators. This study aims to evaluate the performance of the existing traffic network and public transport in Najaf City and its interference with noise and air pollution at selected points for data gathering by using field measurements using cameras, noise meters, and pollution measurement devices. The study states that the public transport sector in Al-Najaf city is significantly poor as private cars are dominant by about 65% of traffic mix with values of pollution and noise above the standards. One of the most effective solutions to traffic problems is the implementation of intelligent transportation systems. Part of these strategies is establishing a tram network and raising road classes’ strategies by proposing some geometric design editing, U-turns reducing, and raised ramps additions.

ГИС оценки влияния дорожного транспорта на шумовое загрязнение городских территорий

The article deals with the creation of a geographic information system (GIS) for assessing the noise pollution of an urban area from road transport under various conditions. The factors that can influence traffic noise are studied. A measurement experiment was planned, and control points were selected and justified taking the following factors into account: traffic level, transport, traffic features, number of lanes, adjacent territory. A measurement experiment was carried out using a noise meter at selected points at different times on the territory of Vasilyevsky Island. All information about the points, including location, noise level readings and conditions, are systematized on the basis of GIS ArcGis Desktop. Two databases were compiled: the Monitor database contains general information and contains control points reflected on the map; the Analys database contains information about dependencies and factors. Based on the data obtained and their analysis, various factors were analyzed and thematic maps were constructed. These maps clearly show the impact of road transport on the pollution of urban areas under various conditions. The created geoinformation system makes it possible to identify the most dangerous areas in order to develop recommendations for preventing the negative effects of noise on the health and life of people and nature.

Workers Risk Levels of Noise in the Dairy Cow Milking Parlor

The study was carried out in the milking parlor of a dairy cattle farm consisting 500 animals from Holstein-Friesian breed in Bulgaria. The animals were housed in a freestall dairy barn and milked in double-8 milking parlor “herringbone” type. The level of noise was measured three times in every milking (at the beginning, in the middle and at the finishing of the milking) in the morning, midday and evening milking every month for one year. The noise level in the working environment was recorded by noise meter„ Lutron SL-4023SD. The highest noise levels were reported in summer and winter, with maximum values up to 78.3 dB. It was found that regardless of the season during the morning milking the lowest noise levels in the milking parlor were reported (from 70.37 to 70.46 dB). The average values for noise level for an 8-hour working day by seasons varied from 69.87 dB to 74.36 dB, with the highest reported value for the winter season.

Determination and Evaluation of Noise Pollution in Layer Hen House: A Bursa Case Study

Both animals and employees need to improve the indoor conditions in livestock barns and keep them at an optimum level. With the development of automation systems for increased productivity and mechanisation, more systematic production occurs within the poultry houses and the need for a workforce is reduced. However, the increase in industrialisation and herd size can cause noise pollution problems in the poultry house. In this study, noise levels were measured and statistically evaluated in a laying hen farm operating in a battery-type cage in the Bursa region. It is aimed to be assessed according to environmental pollution and animal welfare. It was measured in the corridors between the rows of cages and on the cage floors with the studied facility's noise meter (EXTECH SDL600). The obtained noise data were determined by the SPSS statistical program, the variance analysis of the differences between the corridors and the relationship between the layer hen house environmental factors (temperature, humidity and wind speed) and the regression analysis. According to the results measured throughout the year in the investigated enterprise, the maximum noise intensity was measured as 80.6 dB, and the minimum noise intensity was measured as 76.3 dB. The differences between the noise values measured in the aisles and floors of the cage rows are statistically significant.

Изменение конструкции малого опытового бассейна для комплексных испытаний подвесных лодочных моторов

When studying the characteristics of the outboard motors with capacity of more than 10 kW weighing over 100 kg at full equipment, the Department of Water Transport Operation of Astrakhan State Technical University needed to change the design of a small experimental tank. Previously, the small experimental tank was adapted for testing outboard motors with capacity not exceeding 8 l/s - 6 kW and weight up to 25 kg having such technical indicators as the screw stop, the developed power of the outboard motor, tank water temperature, exhaust gas temperature, fuel consumption, rate of heating the aquatic environment during the engine operation, the number of revolutions 
 of the engine crankshaft, the number of revolutions of the screw, with possibility of environmental studies of noise levels, vibration levels, as well as harmful discharges and exhaust emissions of outboard motors by sampling water and gases. In addition to sensors and devices designed to measure technical and environmental indicators, the small experimental tank was previously equipped with an auxiliary equipment: supply and exhaust ventilation, a water level gauge in a basin tank, a steam compressor refrigeration unit, a water supply and drainage system with sampling fittings, a gas sampling probe, a rotary rod for installing a noise meter, a platform with steps, general and local lighting fixtures. There has been illustrated a layout of an experimental tank covered with heat-insulating paint from the outside. In the course of changing the structure there was installed a lifting boom and an external transom. The tank bowl was upgraded by installing a bypass pipe. The described technical solutions have expanded the possibilities of the small experimental tank in conducting the research on outboard motors.