Abstract: A shielding enclosure, for example an appliance sound enclosure comprises a base, a front shield and a top shield. The base is fixed onto a surface and has a back wall and pair of sidewalls connected to the back wall. The front shield is adapted to be rotatably mounted onto the base and is slidingly connected to the top shield by a pin-in-slot connection. The top shield is adapted to be rotatably mounted onto the base and is slidingly connected to the front shield by a pin-in-slot connection. The front and top shields have arcuate panels that, in combination with the rotation around the base, provide for an enclosure around an appliance.

Abstract: A technique for reducing acoustic noise emitted by a magnetic resonance imaging system includes providing energy dampening elements in the scanner, such as within the gradient coil assembly, between the gradient coil assembly and the primary magnet, and around the outer and inner peripheries of the primary magnet and RF coil. The elements may be formed to conform to the structures of the scanner, and may be tile-like elements which can be fitted to new scanners and retrofitted to existing equipment.

Abstract: A noise reduction structure for a cab of a working vehicle, by which a high degree of noise reduction effectiveness can be surely obtained, is provided. For this purpose, the noise reduction structure has a configuration in which a sound-insulating chamber (A; B; C) adjacent to a cab (10a) is provided at a position of at least one of the following: under a floor (11a) of the cab (10a), behind a rear wall of the cab (10a), and at a side of a side wall of the cab (10a).

Abstract: A shielding enclosure, for example an appliance sound enclosure comprises a base, a front shield and a top shield. The base is fixed onto a surface and has a back wall and pair of sidewalls connected to the back wall. The front shield is adapted to be rotatably mounted onto the base and is slidingly connected to the top shield by a pin-in-slot connection. The top shield is adapted to be rotatably mounted onto the base and is slidingly connected to the front shield by a pin-in-slot connection. The front and top shields have arcuate panels that, in combination with the rotation around the base, provide for an enclosure around an appliance.

Abstract: Apparatus for reducing noise emitted from an appliance having a cabinet that supports at least one component that emits at least one acoustic pressure wave therefrom. In a preferred form, the apparatus comprises at least one diffuser having at least one deflection surface. The diffuser is coupled to the cabinet and positioned relative to the one component such that the acoustic pressure wave emitted from the component is deflected by the one deflection surface in a predetermined direction. The diffuser can be used to deflect acoustic pressure waves such that they collide with each other. The apparatus may further include at least one absorber. The diffuser is strategically located to deflect acoustic pressure waves being emitted from the component into the absorber to reduce the noise emitted from the appliance.

Abstract: An apparatus attenuates noise from a cabinet that houses computer equipment. The apparatus includes a frame, a set of positioning members to position the frame relative to the cabinet, and lateral noise absorption members that are supported by the frame. The lateral noise absorption members define surfaces that form sides of airflow channels through the apparatus. The surfaces are substantially non-parallel to a direction of an airflow pathway through the cabinet when the set of positioning members positions the frame relative to the cabinet. The lateral noise absorption members absorb sound energy emanating from the cabinet (e.g., from a fan assembly within the cabinet). The lateral noise absorption members transform some of the sound energy into low level heat which can be dissipated into the air stream. Additionally, some of the sound energy is reflected back into the cabinet toward the source.

Abstract: A motor noise silencer reduces noise at a source, such as an unbalanced electromechanical motor. The silencer, in one embodiment, comprises a multi-layer shell and an integrated vibration-based cooling system. The shell has an inner layer, a middle sound and vibration absorbing layer, and an external layer. The middle layer offers a soft coupling between the outer and inner layers. Heat trapped within the silencer is channeled out by utilizing a vibratory motion of a source (i.e., motor) and motor support system. The silencer provides noise reduction while providing ventilation using vibration generated by the motor.

Abstract: 13A cover for a marine generator that attenuates the noise produced by the generator when operating and shields the generator from overhead water damage. The cover includes a substantially water resistant flat top wall having a layer of sound-absorbing material secured to its underside. The flat top wall is supported by four leg members and is disposed in closely spaced apart relation to the top of the generator. Some parts of the generator can be serviced when the flat top wall is locked into place and all parts of the generator can be serviced when the flat top wall is removed.

Abstract: A sound generating or emitting machine having a component comprising a material with a high internal damping and tensile strength, the material comprising (1) a metallic base material, and (2) a metallic second phase with an at least partially martensitic structure. The material may also be an alloy comprising a base material in which additional alloy elements have a very low solubility.

Abstract: A container for the noise-muffling accommodation of a unit to be installed in a vehicle, such as an electric motor, a pneumatic pump or the like, has two container parts. Each container part is formed by a foam part and is fitted together to form a closed housing. The housing is adapted to be clipped to a vehicle bodywork for assembly on neighbouring parts of the vehicle. A U-shaped holder is partially integrated into one container part. The U-shaped holder is foamed in place. The legs of the U-shaped holder each have a clipping member on mutually opposite wall parts of the container supporting it. The clipping members extend beyond the aperture edge of the container part to clip together the two container parts. A flange projects outwardly from the container walls to secure the container in a gap in the bodywork. Each flange, on its side remote from the respective clipping member, has at least one supporting shoulder projecting laterally outwardly from the container part.

Abstract: Noise attenuating apparatus for housing, inter alia, a compressor and/or condenser unit, the apparatus comprises a substantially box-shaped outer shell and an inner shell which houses the unit. The outer shell is formed with a primary air inlet to receive air into the apparatus and a primary air outlet for discharge of spent air from the apparatus. The inner shell includes an inner chamber and is formed with a secondary air inlet to receive air supplied via the primary air inlet means into the inner chamber to supply air to the unit. The inner shell is also formed with a secondary air outlet opening for flow of spent air from the inner chamber. The space between the inner and outer shells defines a tortuous flow path for the removal of spent air from the apparatus through the primary air outlet means.

Abstract: A noise suppression louver for an enclosure, in particular, an apparatus for suppressing sound at the openings which allow air to enter or exit an internal combustion engine enclosure. The louver comprises a matrix of intersecting horizontal and vertical passive sound absorptive slats.

Abstract: An air blower unit operates with reduced noise while providing a stream of warmed air. The blower unit includes a housing with an inlet at a first end and an outlet at a second end. A support positions the housing above a support surface such that the inlet points toward the support surface, and the outlet does not point away from the support surface. A rotatable blower creates an airstream by flowing air into the housing through the inlet and out of the housing through the outlet. The outlet is coupled to a delivery conduit having an elbow that absorbs some noise from the blower, and reflects remaining noise downward. The delivery conduit may be connected to a convective thermal blanket, for example. A motor, mechanically linked to the blower, rotates the blower and resides in the housing upstream of the blower. A heater, interposed between the blower and the motor, heats the fluid stream as it passes the heater.

Abstract: A machinery sound absorbing apparatus includes a machine which generates a machinery sound, and a sound absorbing unit provided above the machine to have a convex shape in an upward direction. The sound absorbing unit includes a reflection plane as an underside surface opposing to the machine. The reflection plane is formed of a sound absorbing material and is a set of plane elements, each of which has an angle of 30 degree or less with respect of a vertical direction. Also, the reflection plane is smooth to a wavelength of the machinery sound.

Abstract: A reduced-noise relay has an inside housing and an outside housing. Inside terminals are connected to outside terminals via stranded conductors. An additional intermediate cap of elastomer is plugged over the inside housing with the stranded conductors in the interspace between the inside housing and the outside housing. Together with a damping frame and a damping plate, the intermediate cap effects a sound decoupling of the relay from the outside.

Abstract: A soundproofing system is proposed for an electrical machine, in particular a generator. The soundproofing system has a plurality of airtight soundproofing elements mounted releasable attached in an airtight manner using seals and fasteners to a casing frame of the electrical machine. The casing frame being in the form of a framework of the electrical machine. The soundproofing element has a circumferential frame that has a U-shaped profile and is fitted on one side with a covering plate and on the opposite side with a perforated plate. A base surface of the frame governs a height of the soundproofing element. A side surface of the frame acts as a sealing surface with respect to the casing frame of the electrical machine, and the other side surface of the frame is used as a sealing surface for the covering plate. An airborne sound attenuator is inserted between the frame, the covering plate and the perforated plate. The covering plate is mounted in an airtight manner on the sealing surface of the frame.

Abstract: A hydraulic pump-motor having an end shield which deadens the sound generated by the pump-motor to thereby result in a quieter unit. The present invention provides a conventional hydraulic pump-motor having an electric motor coupled to a pumping mechanism wherein the motor includes an improved sound attenuating end shield design. Through the use of acoustically deadening materials such as cast iron and polypropylene plastic in the end plates of the present invention deaden the sounds stemming from the vibration of the pump-motor. The end shield includes a ring member which may be die cast aluminum that secures the stator to the housing a central plug of such materials as cast iron or plastic that fills the central opening of the ring member.

Abstract: A noise-deadening laminate board configured for noise deadening having a bituminous layer more than 1 mm thick, bonded to one side of a thermal insulation layer of foam, felt or the like, and an adhesive layer on the other side of the thermal insulation layer for adhesion to a component to be improved acoustically, the bituminous layer, thereby being located on the outer side of the laminate board.

Abstract: A hydraulic pump-motor having an end shield which deadens the sound generated by the pump-motor do thereby result in a quieter unit. The present invention provides a conventional hydraulic pump-motor having an electric motor coupled to a pumping mechanism wherein the motor includes an improved sound attenuating end shield design. Through the use of acoustically deadening materials such as cast iron and polypropylene plastic, the end plates of the present invention deaden the sounds stemming from the vibration of the pump-motor. In addition, the present invention provides an end shield design which allows the stator to be secured to the motor housing and the air gap between the rotor and the stator to be precisely measured prior to the installation of the end shield. The present invention therefore results in not only a quieter pump-motor but also a pump-motor with higher machining tolerances, improved efficiency, and lower production and maintenance costs.

Abstract: An acoustic testing device is relatively small enough and light enough to be transported from business to business and room to room, and yet still has acoustic characteristics sufficient to characterize a test item's noise profile in a relatively short period of time. The device preferably achieves this result by providing inner and outer housings coupled through noise and vibration isolation, the inner housing having at least some mutually non-orthogonal walls, and the sound detection apparatus comprising spatially translating microphones.

Abstract: An enclosure for enclosing sound-producing equipment (such as a marine propulsion system), the enclosure having first and second opposing end panels, first and second opposing side panels, a base and a top panel, releasably connected to each other at corresponding mitered edge joints. The method of making the enclosure includes molding a single enclosure preform and then severing the preform into side, end and top panels. The enclosure preform may be rotationally molded, for example, and may have a layer of sound absorbing material applied to its inner surface during molding. Other, non-molded sound enclosure embodiments are also disclosed.

Abstract: A plurality of acoustical absorption elements are mounted in a two-dimensional spaced array on an acoustically reflective surface of an machinery enclosure, in such a manner as to expose portions of the reflective surface between neighboring elements. The elements are preferably of a substantially standard size and shape in order to enhance production and inventory efficiency, although materials of various thickness may be provided to accommodate tuning for specific frequencies to be absorbed.

Abstract: An upper housing shell of a hermetically sealed refrigeration compressor has a central asymmetrical section interposed between a lower cylindrical section and an upper spherical section. The shape of the central section is such that opposite points define a line that is perpendicular to the surface at one point, but is not perpendicular to the surface at the opposite point.

Abstract: A soundproof material comprising a porous member having an air permeation amount based on the pressure difference of 2.039.times.1/10.sup.4 mmH.sub.2 O of from 1.times.1/10.sup.10 to 2.times.1/10.sup.2 cc/cm.sup.2 /second, and having a compressibility.

Abstract: A compressor unit having a housing consisting of steel inner and outer shells, the shells being spaced apart from each other to provide an attenuation cell substantially occupying all of the space between the shells, a suction gas inlet and a discharge gas outlet extending through both of the shells and the cell and being isolated from the outer shell by sound absorbing means, and spacer material having sound absorbing properties positioned between the shells and maintaining the spacing therebetween, the spacing being, preferably, at least about 0.06 in. in width over at least a major portion of the cell.

Abstract: An acoustically insulated apparatus is disclosed which includes a machine and an acoustical insulation system for the machine, wherein the machine generates noise having a peak sound frequency. The insulation system includes a two-part stratum having a porous sound absorbing media layer, and a sound reflecting barrier layer located between the sound absorbing layer and the machine, wherein the two-part stratum exhibits maximum sound absorption at the peak sound frequency.

Abstract: An enclosure for acoustically insulating noise-producing equipment, such as an engine or generator, includes a base, first and second opposing end panels, first and second opposing side panels, and a top panel. The side and end panels rest upon the base and are releasably interconnected at mitered edge joints. The top panel is releasably connected to the end and side panels at similar mitered edge joints. The top, side and end panels are each separately removable from the enclosure without removing any other of the panels, enabling unobstructed access to all sides of the enclosed equipment. Guide pins at the mitered joints align the panels. Methods of use are also disclosed.

Abstract: A method and apparatus for removing heat from an acoustically shielded electro-mechanical assembly without relying upon a convective air flow and without the provision of bulky external heat sinks provides an acoustically shielded electro-mechanical assembly, such as a hard disk drive, that may be used in a personal computer. The invention may be used successfully in any application where noise mitigation measures, such as encapsulation of an electro-mechanical assembly within an acoustic shield, otherwise cause undesirable overheating of the assembly.

Abstract: An acoustical enclosure for an engine generator set which can be easily assembled and disassembled, as well as assembled and disassembled in close quarters. The assembly and disassembly can be accomplished without special tools. The enclosure is constructed in a manner to afford a change in size or configuration without a change in tooling. The rail/frame construction allows removal of side, end and top panels thus simplifying maintenance.

Abstract: A lightweight acoustic enclosure (1.1), for the reduction of noise transmission from monopole, quadrapole and higher order noise sources via airborne paths at frequencies lower than the approximate ring frequency of the enclosure (1.1), comprising an approximately spherical shaped enclosure (1.1), which is made from stiff materials to reduce the amount of stretching of the enclosure wall and substantially encases the noise source, all structural paths between the enclosure and the noise source comprising vibration isolation (2.4). The thickness of the enclosure wall can be relatively thin. The enclosure (1.1) can comprise multiple concentric layers of stiff material, ideally with adjacent layers having at least one compliant layer, such as foam rubber, sandwiched between them. The enclosure (1.1) can comprise several component parts such as spherical shell elements (1.2), with radii less than that of the approximate radius of the enclosure (1.1). Additional webbings or flanges (1.

Abstract: A device for receiving a fuel delivery unit (12) inside a fuel tank, in particular of motor vehicles, is proposed. The fuel delivery device (12) is essentially completely surrounded by a damping element (14), wherein the damping element (14) is connected with a holding device (13) and essentially completely decouples the fuel delivery unit (12) from the holding device (13). The device (11) can be arranged via the holding device (13) in the fuel tank. (FIG. 1 in connection with this).

Abstract: An electrical transformer includes a housing, a transformer core and winding subassembly located in the housing, and a cooling fan subassembly. The cooling fan subassembly includes a variable speed fan located outside the housing, a temperature sensor located near the housing, and a controller having an output port connected to the variable speed fan and an input port connected to the temperature sensor. The controller reduces the fan speed (and hence the fan noise) when a lower fan speed can maintain the desired temperature as sensed by the temperature sensor. Preferably, the electrical transformer further includes an active mount subassembly and/or (when the housing includes a tank containing transformer fluid) a mechanism for varying the dynamic pressure of such transformer fluid.

Abstract: A motor mount is described for preventing the transmission of noisy vibration of the motor on vehicle body parts on which the motor is mounted by its motor housing. The motor housing is held by a carrier part that surrounds it. The carrier part is surrounded at a radial distance by a mounting part at least in some areas. The mounting part is connected to the carrier part by an elastic sound-absorbing intermediate layer that is subjected substantially to tensile stresses.

Abstract: An appliance muffling device for reducing noise and vibrations produced by conventional appliances, such as blenders, comprising a uniform cover connectable to a uniform base enclosure both preferably having side walls where a connection is made through snapping engagement so as to form an interior volume for enclosing an appliance, wherein the switch or switches of the appliance are engageable by a slidable switch engaging member assembled on opposite sides of the base side walls through an aperture defined by the base side walls. The appliance muffling device further comprises a ventilating system including an air intake chamber, for receiving ambient air from a plurality of air intake channels defined by the base in communication therewith, and an exhaust channel separate and independent from the air intake chamber for exhausting heat produced and emitted by the enclosed appliance.

Abstract: A blower muffling apparatus includes a blower chamber for housing a blower therein, an exhaust chamber positioned adjacent the blower body side of a blower disposed in the blower chamber, communicating in one of upper and lower portions with the blower chamber, and having an exhaust port in the other portion, a muffling passage chamber disposed adjacent the blower chamber in the axial direction of the blower, and having one end communicating with the other portion of the exhaust chamber and the other end communicating with a discharge port of the blower through a flexible exhaust duct, and a duct accommodating chamber for accommodating the flexible exhaust duct therein, each of the chambers being surrounded by a sound-absorbing material. Exhaust gas of the blower is discharged from the flexible exhaust duct through the muffling passage chamber and the exhaust chamber to thereby absorb exhaust noise of the blower.

Abstract: A sound barrier cover for a compressor unit which has a housing provided by a substantially continuous wall which provided with a plurality of access ports therethrough. The barrier cover has first and second shell sections configured to lie close to the housing wall and substantially envelope the same wherein the shell sections are configured to provide two substantially longitudinally oriented halves each having sound absorbing material affixed to its inner surface. These halves have perimeters with portions thereof formed with mating tongue and groove structure and carry cooperating components of snap-fastener devices in close proximity to the perimeters. These snap-fastener devices are adapted to hold the perimeters in contact with each other and with the sound absorbing material in resilient contact with the housing.

Abstract: A silencer for the primary air intake port of an air compressor which includes (a) a housing defining a cylindrical chamber with an inlet orifice at one end and an outlet orifice at the other and (b) a baffle including (i) a substantially cylindrically shaped portion generally concentrically positioned within the chamber which divides the chamber into a central cylindrical compartment in fluid communication with the outlet orifice and an annular compartment in fluid communication with the inlet orifice, (ii) an opening through the cylindrical shaped portion of the baffle proximate the inlet orifice for providing fluid communication between the central cylindrical compartment and the annular compartment, and (iii) a wing extending generally radially from the cylindrically shaped portion of the baffle into contact with the housing sidewall between the inlet orifice and the opening forcing air flowing into the chamber from the inlet orifice to travel along substantially the entire circumference of the annular co

Abstract: A silencing device for a vacuum cleaner includes dampers for absorbing operational vibration of a suction motor. The operational noises of the suction motor are intercepted and suppressed by a middle case, a lower case, a bottom case and a top case. The exhaust noises caused by exhaust air flow are repeatedly absorbed and suppressed by a plurality of exhaust ports. The exhaust air flow is also dispersed so as to suppress the exhaust noises. In the primary embodiment, the noises generated by both the suction motor and the exhaust air flow are effectively suppressed to desired low levels. In a second embodiment, the silencing device comprises a noise absorber for absorbing and suppressing both suction noises caused by suction air flow and operational noises of the suction motor. The silencing device also has a cover for covering and supporting the front surface of the noise absorber. The back of the noise absorber is supported by a rear supporter.

Abstract: A hermetic motor compressor comprising a shell formed by an upper and a lower cap connected one to the other in such a way that an airtight closure is obtained in the shell, and by feet fixed to the lower cap for positioning the shell in the correct position during its working, the lower cap defining lower cap lateral surfaces having a very large curvature radius connected to first, second, third and fourth curved surfaces. First and second curved surfaces being connected to a lateral plane and third and fourth curved surfaces being connected one to the other, the lower cap defining a sphere-shape in a lower part thereof and a band in the upper part thereof which is joined to the upper cap.

Abstract: An electric motor assembly. An air-ventilated electric motor includes a motor housing having a cooling-air inlet and a cooling-air outlet. An outlet muffler array is located outside, and spaced apart from, the motor housing and includes two or more outlet mufflers each having a fluid entrance and a fluid exit. An outlet connecting duct has a first end connected to the cooling-air outlet of the motor housing and has a second end connected in parallel to the fluid entrances of each of the outlet mufflers. The assembly may also include an inlet muffler array and an inlet connecting duct.

Abstract: An appliance muffler for absorbing sound wave vibrations and impact from foreign objects employed to muffle noise transmissions produced by the appliance and to protect the outer surface of the appliance, wherein the appliance muffler comprises a flexible appliance jacket mounted over the appliance base and a flexible and stretchable appliance container sleeve mounted over the container.

Abstract: A microprocessor speed control system for a refrigeration apparatus for controlling a speed of at least one variable speed motor is provided. The control system has an input for receiving demands to vary a speed of the motor and a memory where certain predetermined speed ranges are kept in a means for preventing the motor from being operated at the predetermined speed ranges. The predetermined speed ranges can be based upon speed ranges which cause excessive noise or vibration in the refrigeration appliance or any of its components.

Abstract: A silencer for the primary air intake port of an air compressor which includes (a) a housing defining a cylindrical chamber with an inlet orifice at one end and an outlet orifice at the other and (b) a baffle including (i) a substantially cylindrically shaped portion generally concentrically positioned within the chamber which divides the chamber into a central cylindrical compartment in fluid communication with the outlet orifice and an annular compartment in fluid communication with the inlet orifice, (ii) an opening through the cylindrical shaped portion of the baffle proximate the inlet orifice for providing fluid communication between the central cylindrical compartment and the annular compartment, and (iii) a wing extending generally radially from the cylindrically shaped portion of the baffle into contact with the housing sidewall between the inlet orifice and the opening forcing air flowing into the chamber from the inlet orifice to travel along substantially the entire circumference of the annular co

Abstract: Portable, low noise air pump apparatus employing an inexpensive lightweight pump and motor unit, which pumps a pulsed noisy output into a plenum chamber inside a rubber impervious sub-housing which absorbs noise and vibration; and a sound deadening plastics tube which carries the compressed air from the plenum, via a sound absorbing chamber (surrounded by lightweight sound absorbing material which supports the sub-housing) and across an accommodation space to an outlet fitting from which a smooth low-noise compressed air output can be supplied.

Abstract: A ventilator has incorporated in a main body thereof an air blower having a ventilation casing provided with a fan intake opening facing an intake opening of the main body of the ventilator, the inner side of the main body being opened to form the intake opening thereof. A cylindrical soundproof unit including an inner ventilation passage having a larger ventilation area than a fan intake space and formed of a laminated plate which is formed of a plurality of air layers arranged in a direction intersecting the rotation axis of the air blower from the inner ventilation passage, is disposed in a space between the fan intake opening and the intake opening of the main body. The soundproof unit makes it possible to decrease noise generated by the air blower while the ventilation resistance is hardly increased.

Abstract: A sound attenuating enclosure with sound absorbing panels. The panels are positioned in an array of four side panels and a top panel. The array of panels is covered with vinyl material forming seams between adjoining panels and flaps for securing the panels together to form the enclosure. Each of the panels is provided with a pouch having a resealable opening for containing a flat sound reflecting element. One predetermined side panel is provided with apertures for allowing supply lines to pass through the enclosure.

Abstract: A slip over, sound muffling cover for a machine such as a compressor is disclosed which includes an outer layer of relatively rigid, bendable, resilient material capable of being distorted and returned to its desired shape, and an inner layer of flexible, sound absorbent material. The outer layer includes a cap having a broad surface and a pair of open sided trays attached on corresponding ends thereof to the broad surface so that, under normal circumstances, the open sides of the trays face one another. Each of the trays contains a pair of elongated flanges on opposite side edges thereof, pairs of such flanges which oppose one another on the same side of the trays are closable against one another to enclose a machine in the sound absorbent material.

Abstract: A vibration reduction assembly for isolating the top cover from the machine, for use in combination with a dynamoelectric machine having a cover for guiding air into and out of the machine while protecting the machine from airborne water and dirt. The vibration reduction assembly comprises a plurality of spaced neoprene pads provided between the cover and the machine, the pads of a density and size selected to obtain low transmissibility and amplification of vibration caused by the machine thereby reducing vibration of the machine; a plurality of closed cell foam rubber strips positioned between adjacent ones of the plurality of neoprene pads, the strips for filling space between the cover and for protecting the machine from incident atmospheric precipitation and dust. The cover is affixed to the machine with a plurality of bolts, each bolt engaging a neoprene washer and a neoprene sleeve to eliminate metal to metal contact.

Abstract: A centrifugal compressor is provided with a collector for receiving refrigerant from the diffuser, and sound absorbent silencer segments are placed within the collector and retained in place against one wall thereof. The silencer segments are held in place by machine screws that penetrate graduated openings in the side wall of the collector. The machine screw shaft fits a threaded nipple on the silencer segment that also fits into the opening. A sealing plug is disposed in a wide part of the opening above the machine screw head to prevent leakage of the compressed refrigerant.

Abstract: An electromagnetic induction apparatus includes a tank having a bottom plate and containing an electrical device which vibrates during operation. The tank is supported by supporting members disposed between the tank bottom plate and a floor surface to define spaces therebetween. Sound suppressing members are disposed in the spaces defined between the support members, the tank bottom plate, and the floor surface. The sound suppressing members absorb sounds generated within the spaces and prevent air within the spaces from resonating during vibration of the electrical device.