Engine parameters including exhaust noise, power, torque, brake specific fuel consumption, exhaust emissions (NOx, HC and CO) were measured. For each test, the measured data was recorded after the engine reached a stable operating condition for more than one minute and the engine speed showed a departure from the specific speed value …
Learn MoreThis article presents a comprehensive overview of the various types of mufflers that researchers have studied based on their acoustic performance. Mufflers are a crucial component in noise control to minimize the noise generated by various machines such as internal combustion engines, fans, and other sources that include gas flow. They …
Learn MoreThe Dudek noise tool allows a user to access this database and input levels for individual on-site equipment sound emission. Dudek noise modeling experts have used this tool to evaluate several …
Learn MoreFrom the perspective of compressor noise generation mechanism, the aerodynamic noise inside the turbocharger is mainly composed of two components, namely discrete noise and broadband noise [19]. BPF noise is discrete noise, which is formed when the blades on the rotating impeller squeeze the surrounding gaseous medium and …
Learn MoreEnergy Storage. The Office of Electricity''s (OE) Energy Storage Division accelerates bi-directional electrical energy storage technologies as a key component of the future-ready grid. The Division supports applied materials development to identify safe, low-cost, and earth-abundant elements that enable cost-effective long-duration storage.
Learn MoreAbstract: With the rapid development of energy storage technology, onboard energy storage systems(OESS) have been applied in modern railway systems …
Learn MoreIn this paper are presented the dominant parameters that influence noise formation, where the main focus was placed on brake pads, as well as how the noise influences people''s health. After that, further, in the paper, it was analyzed the influence of the brake pads'' construction on the noise formation, and at the end are given the measures for noise …
Learn MoreStability analysis and improvement of disk brake systems for squeal reduction have been investigated by automotive manufacturers for decades. However, most of the researches have not considered uncertainties. For this case, a practical approach for analyzing and improving the stability of uncertain disk brake systems is proposed in this …
Learn MoreThe aerodynamic noise of pipelines is an important part of the noise of a ship''s system. This paper conducted numerical investigations on the flow and acoustic Yigang Luan, Lanyi Yan, Tao Sun, Pietro Zunino; Aerodynamic noise and its reduction of the marine gas turbine air exhaust system. ...
Learn MoreA significant problem in vehicle hybridization is determining the optimal size for the energy storage system, while incorporating an energy management strategy as …
Learn MoreCompression brake noise is also a representative sample of the noise levels of. audible with OEM exhaust systems and, in at least. case, potentially objectionable. Two methods for. reducing brake noise are investigated: improved mufflers and the use of an exhaust brake with the compression. brake.
Learn More872265. Development of a Braking Energy Regeneration System for City. Norio Nakazawa, Yoichiro Kono, Eijiro Takao, and Nobuaki. Truck & Bus Engineering Center. ABSTRACT. …
Learn MoreExhaust Noise Reduction in Two-Stroke Snowmobile: Development of a Mechanically Active Quarter Wave Resonator 2015-01-2211 In the present study by the University of Idaho Clean Snowmobile Challenge (UICSC) team, the necessity, history, and research of noise reduction strategies in two-stroke snowmobile exhaust is presented.
Learn MoreThis paper presents a reduced-order modeling technique for energy storage systems such as Lithium-ion batteries (LiBs). Data-driven models offer a solution to represent the system dynamics without requiring in-situ measurements and proprietary information needed by mechanistic models.
Learn MoreExhaust gas recirculation (EGR) and selective catalytic reduction (SCR) have become important technologies to reduce the NOx emission of heavy-duty diesel engines and meet the increasingly stringent emission regulations. This paper studied the effect of EGR combined with SCR on the NOx emission characteristics of a heavy-duty diesel engine …
Learn MoreNoise from battery energy storage sites. Like. Comment. Sep 11, 2023. 218 views. Source: Insider Media. mitigation measures available to reduce noise impacts and target noise levels at receptors. As the National Grid evolves to meet the changing requirements placed on it, elements such as the introduction of renewables, the rise in …
Learn MoreThe Active Noise Cancellation (ANC) and Active Sound Design (ASD) technology can basically address these challenges. Eberspächer shows which progress has been made in terms of performance, efficiency, and robustness of the overall system. With the use of electro-magnetic actuators, the sound field can be controlled by software …
Learn MoreDisclosed is an energy-storage-type energy recovery and noise reduction device for a hybrid electric vehicle.
Learn MoreAdvances in seasonal thermal energy storage for solar district heating applications: a critical review on large-scale hot-water tank and pit thermal energy storage systems Appl Energy, 239 ( 2019 ), pp. 296 - 315, 10.1016/j.apenergy.2019.01.189
Learn MoreEfficient regenerative braking of electric vehicles (EVs) can enhance the efficiency of an energy storage system (ESS) and reduce the system cost. To ensure …
Learn MoreThe fan noise after optimization is reduced at all speed, and can achieve a noise reduction effect of 1–1.5 dB(A) on the premise of maintaining the same aerodynamic performance. For the 9-blade fan, the noise before and after optimization basically remains unchanged at high rotating speeds, while the optimized fan flow rate increases by about …
Learn Moreexhaust system hook vibration energy transfer is deter-mined to reduce the contribution of the exhaust system to the vibration of the vehicle and improve the interior acoustic comfort [9, 10]. As well, Guhan et al. adopted the computational uid dynamics (CFD
Learn More1. Introduction Air pollution is of great concern in politics, the scientific community, industry, and society in general. The global warming effect caused by greenhouse gasses (GHG) and especially carbon dioxide (CO 2) emissions from anthropogenic sources led to various international treaties, such as the Kyoto Protocol [1] …
Learn Morebraking energy recovery system in the form of electric energy storage can reduce the power energy loss of the vehicle during repeated starts and climbing uphill, and improve …
Learn MoreHowever, sound diffraction is a major disadvantage of the vertical noise barrier; thus, it is necessary to study its noise reduction performance for better noise control. The performance of the vertical noise barrier is influenced by the height, structures, and materials [6], [7], [8].
Learn MoreN2 - To reduce cold-start emissions, a thermal energy storage (TES) system can be used in conjunction with the exhaust aftertreatment system. Phase change materials (PCM) can be used in the TES system to absorb the exhaust gas thermal energy, thus liquefying and storing it as latent heat.
Learn MoreThe performance of the vertical noise barrier is influenced by the height, structures, and materials [6], [7], [8].The diffraction of sound waves is serious at the margins of the barrier, and it is responsible for the great influence of height on noise attenuation. Chen et al. [9] concluded that the noise reduction effect of the barrier was intensified by …
Learn MoreLiu et al. [ 45] calculated the energy density of compressed air to be 370 kJ/kg under the storage pressure of 20 MPa, which is much lower than that of diesel or gasoline. To ensure the continuous supply of compressed air during the operation, the power of the engine or the vehicle speed must be limited.
Learn MoreOctober 2023. DOI: 10.1121/10.0023233. Bibcode: 2023ASAJ..154A.191E. The use of Battery Energy Storage Systems (BESS) in the electricity grid is rapidly growing due to its ability to bridge the gap between times of energy needs and when certain renewable sources are not generating. The use of battery storage helps the grid to remain stable …
Learn MoreAccording to the statistical analysis results of the characteristics for typical operation, a multi-step series hybrid energy storage system(M-SHESS) is constructed to …
Learn MorePurpose: The main goal of this work is to improve the previously proposed patient-specific pixel-based dual-energy (PP-DE) algorithm by developing an adaptive anti-correlated noise reduction (ACNR) method, resulting in reduced image noise. Methods: Theoretical models of contrast-to-noise (CNR) and signal-to-noise (SNR) ratio were …
Learn MoreEfficient regenerative braking of electric vehicles (EVs) can enhance the efficiency of an energy storage system (ESS) and reduce the system cost. To ensure swift braking energy recovery, it is paramount to know the upper limit of the regenerative energy during braking. Therefore, this paper, based on 14 typical urban driving cycles, proposes …
Learn MoreFourth, Work flow of electric energy storage braking energy recovery system. (1) At the start, the sensor detects the throttle signal and the speed change signal, at which point the battery releases electrical energy to help the vehicle get off. While the vehicle engine is running, the energy regeneration system also generates energy to boost ...
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