Abstract: A system includes an acoustic monitoring, analysis, and diagnostic system having a processor. The processor is configured to receive NF noise signals from a near field (NF) microphone array, the NF microphone array measures noises from a power generation system in a NF. The processor is configured to receive FF noise signals from a far field (FF) microphone array, the FF microphone array measures noises from a power generation system in a FF. The processor is configured to derive NF and FF noise measurements based on the signals and to synchronize the NF and FF noise measurements to create synchronized NF and FF noise data. The processor is configured to analyze the synchronized NF and FF noise data to create a NF and an FF noise signature. The processor is configured to diagnose root causes of noises generated from the power generation system and to report the root causes.

Abstract: An exhaust processing system that includes: an exhaust passageway for directing exhaust gases, the exhaust passageway having passageway walls that define and enclose the exhaust passageway between an upstream position and a downstream position; and an acoustic liner formed against and covering at least one of the passageway walls of the exhaust passageway. The acoustic liner may include uniformly configured modular acoustic blocks fitted against each other. The modular acoustic blocks each may include interior cavities having different lengths configured to dampen targeted sound frequencies.

Abstract: An inlet air filtration unit for a gas turbine includes an inlet filter house having an upstream surface through which air is ingested. A plurality of weather hoods is secured to the upstream surface. A wave-generating system is installed on or proximate to the plurality of weather hoods, the wave-generating system emitting waves that deter pests from the inlet filter house. A method of deterring pests from entering an inlet filter house of an inlet air filtration system is also provided. The method includes: installing a wave-generating system proximate to or on a weather hood on an upstream surface of the inlet filter house; and energizing the wave-generating system to produce energy waves across the upstream surface of the inlet filter house.

Abstract: An exhaust stack assembly includes an exhaust stack having an internal surface that defines an interior of the exhaust stack. The exhaust stack is configured to receive exhaust gas from at least one turbomachine component and exhaust the exhaust gas to atmosphere. The exhaust gas assembly further includes a plurality of attenuation assemblies disposed in the interior, each of the plurality of attenuation assemblies including a base substrate generally oriented in the direction of flow of the exhaust gas through the interior, each of the plurality of attenuation assemblies further including a plurality of attenuation modules mounted to the base substrate. Each of the plurality of attenuation modules includes a fiber mesh. The fiber mesh is exposed to the exhaust gas in the interior.

Abstract: An inlet air filtration unit for a gas turbine includes an inlet filter house having an upstream surface through which air is ingested. A plurality of weather hoods is secured to the upstream surface. A wave-generating system is installed on or proximate to the plurality of weather hoods, the wave-generating system emitting waves that deter pests from the inlet filter house. A method of deterring pests from entering an inlet filter house of an inlet air filtration system is also provided. The method includes: installing a wave-generating system proximate to or on a weather hood on an upstream surface of the inlet filter house; and energizing the wave-generating system to produce energy waves across the upstream surface of the inlet filter house.

Abstract: An exhaust processing system that includes: an exhaust passageway for directing exhaust gases, the exhaust passageway having passageway walls that define and enclose the exhaust passageway between an upstream position and a downstream position; and an acoustic liner formed against and covering at least one of the passageway walls of the exhaust passageway. The acoustic liner may include uniformly configured modular acoustic blocks fitted against each other. The modular acoustic blocks each may include interior cavities having different lengths configured to dampen targeted sound frequencies.

Abstract: An exhaust stack assembly includes an exhaust stack having an internal surface that defines an interior of the exhaust stack. The exhaust stack is configured to receive exhaust gas from at least one turbomachine component and exhaust the exhaust gas to atmosphere. The exhaust gas assembly further includes a plurality of attenuation assemblies disposed in the interior, each of the plurality of attenuation assemblies including a base substrate generally oriented in the direction of flow of the exhaust gas through the interior, each of the plurality of attenuation assemblies further including a plurality of attenuation modules mounted to the base substrate. Each of the plurality of attenuation modules includes a fiber mesh. The fiber mesh is exposed to the exhaust gas in the interior.

Abstract: An acoustic treatment assembly (50) for a turbine system includes a region of the turbine system having a flow path configured to allow a fluid flow therethrough. Also included is at least one sound attenuation structure (52) disposed in the flow path. The sound attenuation structure includes a substantially rigid frame (54) and a flexible membrane (56) retained by the frame.

Abstract: An acoustic treatment assembly includes a fluid passage and a first panel disposed within the fluid passage. Additionally, at least a portion of a fluid flow through the acoustic treatment assembly is configured to flow across a first micro-perforated surface of the first panel. Further, the first panel includes at least one module, and each module of the at least one module includes the first micro-perforated surface and a respective back surface offset from the first micro-perforated surface opposite the fluid flow across the first micro-perforated surface. The first micro-perforated surface and the back surface form a first cavity configured to promote resonance within a first frequency range of the fluid flow.

Abstract: The present disclosure is directed to a sound attenuation system for a gas turbine engine. The sound attenuation system includes a compressor inlet casing having a compressor inlet casing inner surface and defining a compressor inlet passage extending therethrough. An inlet plenum body couples to the compressor inlet casing. The inlet plenum body includes an inlet body inner surface and defines an inlet plenum therein. One or more sound attenuating panels couple to at least one of the compressor inlet casing inner surface and the inlet plenum body inner surface of the duct. Each sound attenuating panel includes a first sheet defining a first plurality of apertures extending therethrough and a solid second sheet spaced apart from the first sheet.

Abstract: An inlet bleed heat (IBH) system manifold for a compressor inlet housing is provided. The manifold includes: a plurality of feed pipes for delivering a compressor discharge air, each feed pipe extending across a duct of the compressor inlet housing. Each feed pipe includes: an elongated inner feed pipe for delivering the compressor discharge air, the inner feed pipe including a plurality of orifices along at least a portion of a length of the inner feed pipe, each orifice extending through a wall of the inner feed pipe allowing the compressor discharge air to exit the inner feed pipe; and a noise attenuating material disposed about the inner feed pipe and the plurality of orifices, the noise attenuating material configured to attenuate noise created by the compressor discharge air exiting the plurality of orifices.

Abstract: A method for collecting acoustic data from an industrial machine is disclosed. The method may include: providing an unmanned aerial vehicle (UAV) having an acoustic receiver attached thereto; and positioning the unmanned aerial vehicle at a specific location so that the acoustic receiver collects acoustic data from the industrial machine at the specific location. An acoustic receiver is attached to the UAV for collecting acoustic data from the industrial machine. An acoustic filter is attached to the acoustic receiver and the UAV for filtering unwanted sound from the acoustic data. Acoustic data can be used by a flight control system to identify a specific location relative to the industrial machine that is a source a specific acoustic signature emanating from the industrial machine.

Abstract: A method for collecting acoustic data from an industrial machine is disclosed. The method may include: providing an unmanned aerial vehicle (UAV) having an acoustic receiver attached thereto; and positioning the unmanned aerial vehicle at a specific location so that the acoustic receiver collects acoustic data from the industrial machine at the specific location. An acoustic receiver is attached to the UAV for collecting acoustic data from the industrial machine. An acoustic filter is attached to the acoustic receiver and the UAV for filtering unwanted sound from the acoustic data. Acoustic data can be used by a flight control system to identify a specific location relative to the industrial machine that is a source a specific acoustic signature emanating from the industrial machine.

Abstract: An inlet bleed heat (IBH) system manifold for a compressor inlet housing is provided. The manifold includes: a plurality of feed pipes for delivering a compressor discharge air, each feed pipe extending across a duct of the compressor inlet housing. Each feed pipe includes: an elongated inner feed pipe for delivering the compressor discharge air, the inner feed pipe including a plurality of orifices along at least a portion of a length of the inner feed pipe, each orifice extending through a wall of the inner feed pipe allowing the compressor discharge air to exit the inner feed pipe; and a noise attenuating material disposed about the inner feed pipe and the plurality of orifices, the noise attenuating material configured to attenuate noise created by the compressor discharge air exiting the plurality of orifices.

Abstract: Various embodiments of the invention include systems, computer program products, and related methods for managing power plant acoustics. In various embodiments, a system is disclosed including at least one computing device configured to perform the following: determine a difference between an A-weighted sound decibel (dBA) level and a C-weighted sound decibel (dBC) level (? dBC-dBA) from a power plant system within a sound spectrum; compare the ? dBC-dBA with a predetermined threshold difference for the sound spectrum; and provide instructions to increase the dBA level of a balancing sound in the spectrum proximate the power plant system in response to determining the ? dBC-dBA exceeds the predetermined threshold difference.

Abstract: A method for assembling a ventilation system is provided. The method includes providing a ventilation hood that includes a cover portion and a discharge portion extending from the cover portion. The cover portion includes a first aperture, an opposite second aperture, and a cavity therein, wherein an interior of the discharge portion is in flow communication with the cover portion cavity. The method also includes coupling a rotatable member at least partially within the ventilation hood, such that the rotatable member extends at least partially through at least one of the first and second apertures, and such that rotation of the rotatable member induces a windage-driven flow of fluid between a portion of the rotatable member and at least one of the first and second apertures.

Abstract: Various embodiments of the invention include systems, computer program products, and related methods for managing power plant acoustics. In various embodiments, a system is disclosed including at least one computing device configured to perform the following: determine a difference between an A-weighted sound decibel (dBA) level and a C-weighted sound decibel (dBC) level (? dBC-dBA) from a power plant system within a sound spectrum; compare the ? dBC-dBA with a predetermined threshold difference for the sound spectrum; and provide instructions to increase the dBA level of a balancing sound in the spectrum proximate the power plant system in response to determining the ? dBC-dBA exceeds the predetermined threshold difference.

Abstract: A generator collector ventilation system includes a ventilation inlet duct formed in a support foundation. The ventilation inlet duct has a first end that extends to a second end. The second end is configured and disposed to direct ventilation fluid into a generator collector housing. A ventilation outlet duct is formed in the support foundation. The ventilation outlet duct includes a first end portion that extends to a second end portion. The second end portion is configured and disposed to direct ventilation fluid from the generator collector housing. A silencer module is arranged in one of the ventilation inlet duct and the ventilation outlet duct. The silencer module is configured and disposed to condition the ventilation fluid passing through the generator collector housing to lower an overall noise signature of the generator collector ventilation system.

Abstract: A method and system for masking pure tones within sound generated from a noise generating source. The method includes detecting one or more pure tones within sound being generated from the noise generating source, and generating one or more masking sounds capable of masking only the one or more pure tones detected within the sound.

Abstract: A method and system for masking pure tones within sound generated from a noise generating source. The method includes detecting one or more pure tones within sound being generated from the noise generating source, and generating one or more masking sounds capable of masking only the one or more pure tones detected within the sound.