According to the previous study54, the proposed metastructure can be easily manufactured. The polymeric casing and frame of ligaments can be fabricated by additive manufacturing, then manually assembled with precision-machined cylindrical steel to achieve the complete unit cell structure. Through the discussion of the BGs and vibrational modes of the proposed metastructure, it is evident that the proposed structure is effective in expanding the first and second relative bandwidth compared with the previous studies.
Upgrade to a Quieter Pump
However, the asymmetric structure generates an unbalanced magnetic force (UMF), which results in vibration and noise problems. In this study, the vibration and noise of the motor are analyzed and optimized. First, the radial pressure is analyzed, and an optimized structure is proposed. The electromagnetic performance of the motor before and after optimization is analyzed using the finite element method. Second, a three-dimensional model is established, and modal analysis is conducted considering the orthotropy of the stator and effective windings.
- Additionally, the opening frequency fop1 observed in the numerical and experimental analyses is identical to that of the analytical model, confirming the existence of the attenuation region.
- The opening of the first BG is attributed to the involvement of global modes incorporating rigid masses and beam flexural-torsional stiffness.
- Based on the prediction results, it was identified that the magnitude of the blocked force was predicted with the error within 2.0% on average for the data, indicating that the results were similar to the results of analyzing the actual FEM.
- The characteristics of a subsystem that is not in the database is predicted through a numerical method.
- The linear solid viscoelastic models show good agreement with the experimental results, suggesting that similar outcomes would be observed at higher frequency regions, thereby confirming the presence of the super-wide attenuation region.
Associated Data
The mass law is a rule of thumb in acoustics that states that doubling the mass of a barrier increases its transmission loss by about 6 dB. This means that adding more layers or using denser materials will result in better soundproofing. The noise from chain drives can also sometimes be reduced by fitting laminated steel guides (the same material as recommended above for vibration damping) at key positions to smooth the path of the chain. Hand-held non-entraining nozzles used for cleaning and drying can always be replaced with entraining equivalents that reduce noise levels, improve safety and reduce air consumption (win-win-win). Another effective technique for reducing pool pump noise is to install a muffler or silencer on it. This device is designed to absorb some of the vibrations caused by the pump’s operation and convert them into heat energy, which is then dissipated away from the pump. This method can significantly reduce the amount of noise produced by the pool pump.
Guide to Pool Pump Noise Reduction
4c represents the normalized displacement field, with navy blue and red indicating minimum and maximum values, respectively. At the flat pass band of 12.82 kHz, enhanced attenuation performance is observed, with the red color gradient gradually decreasing from the input end to the output end. However, the proposed metastructure still permits incident waves to transmit at this frequency, albeit with a slight reduction in displacement magnitude at the output end. The investigation of the damping effect on the flat pass band is conducted both numerically and experimentally and is discussed in detail in a subsequent section.
How does regular maintenance affect pool pump noise levels?
Detailed information regarding the design configuration is provided in the following section. The metastructure is designed to be periodically structured in all three directions to achieve three-dimensional complete BGs. This study relies on finite element analysis (FEA) complemented by analytical modeling and experimental tests on the fabricated prototypes. The band structure is computed using FEA software COMSOL Multiphysics 5.6, employing the Bloch theorem, as outlined in “Basic theory” section in the supplementary information. The vibration modes corresponding to the lower and upper bounding edges of BGs are identified, and the governing mechanism behind the formation of multiple ultra-wide BGs is elucidated. The effectiveness and efficiency of BGs are verified through numerical frequency response analyses on the metastructure and vibration tests on the fabricated prototypes.
Create Multi-Level Decking to Break Up Sound Waves
Because the shared information requires only dynamic information (e.g. Frequency response function), the details (e.g. shape, material, and other security items) of the component model can be kept confidential. In this study, phononic crystals composed of aluminum and epoxy resin mentioned in many literature were studied, and it was found that the band gaps were generally at a higher frequency. In order to explore the research method of phononic crystals, the band gap of ideal phononic crystals composed of these two materials was firstly calculated and analyzed [22, 23]. The specific structure is shown in Figure 1, and the materials are shown in Table 1. It is found that the band gap is at high frequency, the initial frequency of the first band gap is above several kilohertz, and the low frequency band gap is difficult to obtain.
Install Cascading Waterfalls or Fountains
Short-circuiting by bolts or other rigid connections is the most common issue. This approach does not generally reduce low frequency vibration significantly, but it is very effective at higher frequencies (above c 200Hz). If pumps, motors etc are bolted to steel plates, frames or tanks, then these behave as loudspeakers. The isolation prevents the transmission of the higher frequency vibration components, reducing the noise. However, if the source is bolted to the planet (e.g. concrete floor), then the isolation will not reduce the overall noise level – concrete floors only radiate low frequency sound. Contributed to funding acquisition, supervision, and writing—review and editing. D.B.P. performed numerical analyses and experiments, developed supporting theory, and prepared the manuscript draft. S.C.H. oversaw the research, provided guidance, verified the model, analytical model, and results, reviewed the paper, and managed project funding support. All Acoustilay versions significantly reduce the transmission of impact noises such as footsteps, dropped items and moving furniture. The heavier grades of Acoustilay 8 and 15 are also able to reduce airborne noises such as television, music and speech due to their high mass. Maxi Resilient Bars have a wide face to fix into and cannot be squashed flat during installation. Furthermore, the experimental transmission spectra in both directions align well with those of the numerical viscoelastic models. However, due to the limited precision of the piezoelectric sensor compared to the FEA code, a discrepancy exists between the numerical and experimental attenuation depths. The numerical model assumes the polymeric material to be homogeneous, linearly elastic, and isotropic due to the natural damping characteristics of the material. Yet, this assumption may oversimplify the behavior of polymeric materials used in 3D printing, as they frequently exhibit higher material losses and anisotropic properties.
Acoustic Pipe Lagging
It was identified that the blocked force was predicted even after the change of the receiver’s subsystem because it was independent of the connection characteristics (Fig. 12). On the contrary, the contact force was difficult to apply to a new subsystem because it was related to the connection characteristics of the existing simplified subsystem. Through comparison of these two force transmissibility ratios, it was determined which part to improve or replace. For example, at 127 Hz, since the transmissibility ratios of the transmitted force was large, it was necessary to improve the frame. On the contrary, it was found that it was effective to improve the subframe or bush at 57 Hz. Note that you can cover open guards (mesh etc) with polycarbonate sheet if visibility is required. This may seem a very “Blue Peter” exercise, but it is a quick and effective way to assess the acoustic performance of the options before spending money on the final version made from steel, aluminium, polycarbonate or even plywood. Remember that guard vibration radiated as noise can also be treated via damping (as section 1 above). This not only reduces the tonal noise travelling down the intake and exhaust ductwork (typically by 10dB – 20dB), but also the noise passing through the fan casing. This may not only eliminate the need for silencers, but also the need for acoustic enclosures or lagging. In a significant proportion of cases, this approach can actually improve fan efficiency which means that it pays for itself in reduced running costs.
Additionally, be sure to read customer reviews to get an idea of how well each pump performs in real-world settings. With the right pool pump, you can enjoy a peaceful and relaxing time in your pool without any loud noise. If you are still unsure on what kind of pump you need, your local pool store should be able to help you. Just make sure you know what you are currently using so they can help you compare to other models. The obtained transmission spectra from the numerical frequency response analyses are depicted in Fig. It is found that the attenuation region within the frequency response spectra at all the probed points is identical to the band structures illustrated in Fig. For probes 1, 2, and 3, equidistant from each other, exhibit an identical attenuation depth of around − 215 dB, while for point probe 4, the wave attenuation is approximately − 275 dB. https://progorki.com/engineering-perspectives/advantages-of-modular-pools/ at the output end of the metastructure, probe 7, records an attenuation of -350 dB, which is slightly deeper compared to the attenuation value measured at probed points 5 and 6. Despite these depth differences, the wave attenuation region remains identical in all three directions, affirming the presence of the two complete three-dimensional BGs within the proposed structure. The numerically computed displacement profiles of the proposed metastructure along the Γ-X direction for four different frequencies within the pass and stop bands, highlighted by red dots in Fig.
