54 results about "Acoustic design" patented technology

In an acoustic design support apparatus, a speaker selection supporter selects a desired speaker as a candidate for use in a given space based on shape information representing a shape of the space. A speaker mounting angle optimizer calculates an optimal mounting direction of the selected speaker by selecting a mounting direction pattern which minimizes a degree of variation among sound pressure levels at a plurality of positions on a sound receiving surface defined in the space. An acoustic parameter calculator calculates a variety of acoustic parameters at sound receiving points within the space based on both of the shape information of the space and the optimal mounting direction of the speaker.

The invention discloses an acoustic design method for road noise barrier, which comprises the steps of: 1) importing a vector diagram with a Cad format for characterizing the terrains of noise barrier or grid maps with formats such as jpg, bmp, tif, and the like; 2) calibrating the imported graph to achieve the consistence of graphic proportion and actual proportion; 3) combining the actual situation to draw entities such as roads, terrains, houses, forests, grasslands, and the like based on the importing of the graph, and adopting a batch conversion function to finishing the basic work of acoustic modeling by adopting a batch conversion function if the graph is a Cad graph; 4) setting a noise prediction point at a protected sensitive point, calculating a noise value when no barrier exists, and determining an noise-reducing index of the barrier; 5) simulating the noise barrier, adjusting the height and the length of the barrier, and preliminarily calculating a geometrical dimension of the barrier which meets the requirement; and 6) re-calculating the noise-reducing effect of the barrier by combining the geometrical dimension of the sound barrier and simulating the barriers with different structures and sound absorption coefficients until the combination of the geometrical dimension, the structure and the sound absorption coefficient of the sound barrier which meets the requirement is calculated.

An integrated circuit device includes a multi-port piezoelectric-on-semiconductor microelectromechanical resonator, which is configured to support independent and concurrent piezoelectric transduction of multiple resonance modes. The resonator includes a semiconductor resonator body (e.g., Si body) suspended opposite an underlying recess in a substrate. Opposite ends of the semiconductor resonator body are anchored to the substrate. The resonator body may be formed so that a plan layout view of a portion of the semiconductor resonator body is dumbbell-shaped to thereby support acoustic energy trapping of multiple high-Q resonance modes.

A visual-acoustic device is provided that contains an acoustic detector to produce sound waves in communication with a moiré pattern generator that produces moiré patterns corresponding to the sound waves. The device includes a rigid plate having a first repetitive pattern and a flexible plate spaced from the rigid, plate and having a second repetitive pattern corresponding to the first repetitive pattern. The sound waves induce movement of the flexible plate such that the second repetitive pattern moves with respect to the first repetitive pattern to produce the moiré pattern. The visual-acoustic device can be arranged as a visual-acoustic stethoscope.

The invention discloses a high speed railway sound barrier insertion loss calculation method, which is provided according to a high speed railway sound source combination characteristic, a spectrum characteristic and a transmission characteristic, and aims to overcome the shortcomings in the conventional sound barrier insertion loss calculation. The high speed railway sound barrier insertion loss calculation method is applied to acoustic design of a high speed railway sound barrier, so that a theoretical noise reduction result of the high speed railway sound barrier can be calculated. The method comprises the following technical steps of: S1, determining a position relation between a protection target and a line; S2, determining a sound barrier height planned to be set and a horizontal distance from the line; S3, determining an equivalent position of a lower sound source; S4, calculating a sound path difference of the sound barrier to the lower equivalent sound source; S5, calculating insertion loss of the sound barrier to the lower equivalent sound source; and S6, calculating the total insertion loss of the sound barrier by adopting a correction mode.

An electro-optical device with a sound generating body is disclosed, in which an electro-optical device and a sound generating body can be mounted compactly and which can eliminate necessity of acoustic design of the sound generating body for an enclosure of an electronic apparatus for accommodating the electro-optical device. The electro-optical device of the present invention includes a first frame, a second frame opposed to the first frame, a third frame interposed between the first frame and the second frame, an electro-optical panel supported by the first frame, and a sound generating body supported by the second frame and covered by the second frame and the third frame, the sound generating body being arranged so as to be two-dimensionally overlapped the electro-optical panel.

A road sound insulation barrier is composed of a main structural component, sound absorption plates and a sound insulation reinforcement structure. The main structural component is formed by reinforced concrete bases, structural columns, force bearing beams and concave tension beams, the sound absorption plates are arranged in the direction close to a noise source, the sound insulation reinforcement structure is formed by sound insulation plates and square insulation plate shape stiffening ribs and is arranged in the direction opposite to the noise source, and flexible anti-crack mortar is used as adhesives and filling agents. The structural columns, the force bearing beams and the concave tension beams are all prefabricated by reinforced concrete. The road sound insulation barrier has the advantages of being wide in material sources and low in manufacturing cost, and meanwhile accords with acoustic design standards, the use requirement for the sound insulation barrier is met, maintenance cost is low, and the service life is long.

The invention provides a finite element modeling method of an underwater vehicle wedge ring structure. Firstly, the wedge ring connection structure is simplified and grid dividing is performed; secondly, test data are used for obtaining the equivalent elastic modules of the simplified wedge ring structure; finally, an equivalent model of the wedge ring connection structure is set up. According to the finite element modeling method of the underwater vehicle wedge ring structure, the wedge ring connection structure is simplified, a finite element model of the wedge ring connection structure is set up, the modal test data of the wedge ring connection structure are used, an elastic model of an equivalent wedge ring is determined, and therefore the finite element model with high precision of the underwater vehicle wedge ring connection structure is obtained. The method is easy to implement, easy to operate, capable of effectively improving the modeling precision of the underwater vehicle wedge ring connection structure, improving the vibration noise forecasting accuracy of an underwater vehicle and guiding the acoustic design of the underwater vehicle structure.

In an acoustic design support apparatus, a speaker selection supporter selects a desired speaker as a candidate for use in a given space based on shape information representing a shape of the space. A speaker mounting angle optimizer calculates an optimal mounting direction of the selected speaker by selecting a mounting direction pattern which minimizes a degree of variation among sound pressure levels at a plurality of positions on a sound receiving surface defined in the space. An acoustic parameter calculator calculates a variety of acoustic parameters at sound receiving points within the space based on both of the shape information of the space and the optimal mounting direction of the speaker.

The invention provides a method for determining the effective mechanical impedance of a buoyant raft isolation insulating device raft frame structure. The method comprises the steps of: analyzing and acquiring initial calculation parameters of a raft frame structure; calculating a first-order resonant frequency of the raft frame; calculating an equivalent mass of the raft frame; calculating the effective mechanical impedance of the raft frame at a vibration input position of each apparatus. The method can calculate the effective mechanical impedance of a raft frame through quantitative rapid assessment without modeling analysis according to initial design parameters of the raft frame structure under the condition that the design of the raft frame structure is not finalized in a schematic design stage. The method can provide design reference for subsequent detained design of a buoyant raft structure and can guide structure design scientifically and precisely. The method has the advantages of clear design flow, clear operation and high engineering application value. A buoyant raft dynamic characteristic map can be designed according to the method to be promoted and applied in engineering, so that the efficiency of design of a whole structure and acoustic design can be greatly increased.

The invention relates to an ear-in type earphone belonging to the earphone technology field, which comprises an earphone shell, a speaker body disposed in the earphone shell and sound holes disposed in the earphone shell; the earphone shell consists of an earphone front shell and an earphone rear shell; the earphone front shell and the speaker body form an earphone front cavity; the speaker body, the earphone front shell and the earphone rear shell forms an earphone rear cavity. By integrating the earphone front shell and the speaker front cover of the ear-in type earphone, the invention increases the design integration degree of the earphone, simplifies the acoustics design program of the earphone, reduces material and processes for manufacturing the earphone, and saves manufacturing cost; by designing the sound holes into different inner diameter size disposed alternately, the invention effectively improves high frequency effects, and by changing the included angle between the sound hole direction and diaphragm vibration direction to 45-90 degrees, the invention relieves listening fatigue, and achieves an ear-in type earphone with excellent sound quality.

The invention provides a method for determining the noise equivalent frequency of a motor vehicle, which is suitable for different travel speeds and different vehicle types, has simple calculation and high precision, and is used for accurately calculating the insertion loss of a sound barrier. The method for determining the noise equivalent frequency of the motor vehicle comprises the following steps of: step 1, acquiring the noise sample data of the vehicle, including 1 / 3 octave sound pressure level of a single vehicle, the vehicle type and the travel speed; step 2, using a method of Appendix B of Norm on Acoustical Design and Measurement of Noise Barriers to calculate the noise equivalent frequency; and step 3, analyzing a great number of sample data in a statistical manner according to different vehicle type intervals and different travel speed intervals, and determining the noise equivalent frequency which has the maximum probability of occurrence.

In an acoustic design support apparatus, a speaker selection supporter selects a desired speaker as a candidate for use in a given space based on shape information representing a shape of the space. A speaker mounting angle optimizer calculates an optimal mounting direction of the selected speaker by selecting a mounting direction pattern which minimizes a degree of variation among sound pressure levels at a plurality of positions on a sound receiving surface defined in the space. An acoustic parameter calculator calculates a variety of acoustic parameters at sound receiving points within the space based on both of the shape information of the space and the optimal mounting direction of the speaker.

The invention relates to a testing method of motor damping feature recognition and belongs to the field of motor structure acoustic design. The testing method is especially applicable to the testing researches of the damping features of various military and civil large motors and can be used as reference of simulation calculation to guide motor vibration noise response calculation. The testing method aims to overcome the defects of existing motor damping feature recognition methods and the defects of traditional motor damping setting. Different assembling structures of a motor is achieved by disassembling and assembling, a vibration exciter response testing platform is built, an electromagnetic exciter and closed-loop control are used to produce exciting force with given amplitude and frequency so as to test the vibration response of the different assembling structures, the damping features of the different assembling structures of the motor is acquired through excitation-response testing results to serve as the reference of subsequent simulation calculation and guide motor vibration response calculation, and calculation model accuracy is increased greatly.

The invention belongs to the technical field of automobile interior parts, and relates to a production method for a bottom sound-absorbing pad of an automobile engine. The bottom sound-absorbing pad is mainly made of bottom-layer PET (Polyethylene Terephthalate) non-woven fabric, glass wool, light PU (Polyurethane) and upper-layer PET non-woven fabric. The bottom sound-absorbing pad of the automobile engine is made through laying of raw materials, hot mold pressure-keeping molding and punching, post treatment and boxing. The production method has a simple process flow, the investment of production links and tools is reduced, the labor cost is lowered, the punching product is stable in size, the production efficiency is improved effectively, and the product quality is ensured. Moreover, noharmful substance is generated in the production process, and the bottom sound-absorbing pad belongs to an environment-friendly product. By adopting the production method, the indexes of light weightand good sound-absorbing effect are realized for the bottom sound-absorbing pad of the engine, the noise of the engine is lowered effectively, the requirement on the acoustic design of the whole vehicle is met, and the forefront level of the international standard is reached.

The invention relates to a production method of a sound insulating pad under an automobile back seat, and belongs to the technical field of automobile interior trim parts. By mainly using a manner that an elastic layer (pure PET hair felt) is arranged on a lower layer and a heavy coating (EPDM and PE adhesive film compounding) is arranged on an upper layer, the sound insulating pad under the automobile back seat is prepared through paving of raw materials, baking of the raw materials, punching of a semi-finished product forming belt, post-processing and box packaging. The production method is simple in technological process, the production process and the investment of tools are reduced, the labor cost is reduced, and the stacking problem of semi-finished products is solved; moreover, the punching product dimensions are stable, the production efficiency is effectively improved, and the product quality is guaranteed; furthermore, the production process is free of generation of any harmful substance, and the sound insulating pad belongs to an environmentally-friendly product. The production method realizes the index that the sound insulating pad under the back seat is light in weight and high in strength, the noise inside an automobile body is effectively reduced, the requirement of an acoustic design of a whole automobile is met, and international frontier level is reached.

The invention belongs to the technical field of acoustic treatment and particularly provides a modular coupling structure with sound insulation, sound absorption and sound diffusion functions. The modular coupling structure comprises a frame with an upper opening and a lower opening. A punched sound absorption material plate, a punched flame-retardant plate, a porous sound absorption material plate I, a gypsum board, a porous sound absorption material plate II, a wood material plate and an aluminous gusset plate are sequentially mounted in the frame from top to bottom. According to the modularcoupling structure with the sound insulation, sound absorption and sound diffusion functions, the modes of small-room professional acoustic design and building acoustic treatment can be changed, traditional decoration links are directly omitted under the condition of conforming to the relevant national standards and regulations, and harmful gas generated during traditional decoration is avoided.

Headphones include speakers. The rear volume of the loudspeaker is coupled to the mixing volume, the front volume of the loudspeaker is coupled to the mixing volume, and the mixing volume is coupled to the outside. The acoustic impedance caused by the rear volume, the front volume, the mixing volume and the passages between them can be adjusted to the desired sound leakage characteristics in advance. Acoustic damping material may be included in each leakage path to achieve desired characteristics, depending on the type of speaker to be used, the acoustic design of the earphone, the mechanical properties of the earphone body, and the desired frequency response characteristics of the earphone.

The present invention relates to an acoustic design of an earphone horn and particularly relates to a dual impedance earphone. When a voice coil of the earphone horn is made, an enamelled wire of the voice coil wire is designed in a double charge-discharge manner, the outlet direction of a lead of the voice coil forms 180 degrees with the horizontal direction, and the horn is dual impedance. In the earphone, two groups of voice coils are converted into a parallel or serial state through a switch conversion module, at the parallel state, namely the voice coils are low impedance, an audio signal directly drives the horn to sound; and at the serial state, namely the voice coils are high impedance, the audio signal drives the horn to sound after being amplified by an audio power amplification module, at this time, the signal to noise ratio of the audio signal is twice larger than that of at the low impedance, and the signal fidelity is also greatly improved.

The present invention relates to a exhaust gas (S) influencing device, especially used for controlling acoustic emission in vehicle exhaust system. The device including motor-driven closure element in exhaust pipe, said closure element generate pressure fluctuation in exhaust gas so as to proceed so-called 'acoustic design'. Thermal decoupling of force transmission device integrated into force transmission device which being accepted between drive motor (24) and closure element, the decoupling device absorb the thermal transmission between drive motor (24) and closure element.

The invention relates to a one-time forming method for an automobile carpet sound insulation pad and belongs to the technical field of automobile interior trim parts. The manner that a felt sound insulation pad (PET felt) is arranged at the lower portion and a face carpet is arranged at the upper portion (PET and a PE adhesive film are compounded) is mainly adopted, and the product of an automobile carpet is manufactured through felt forming, cooling sizing, soft and hard layer water jet cutter cutting, EPP embedding assembling, face carpet attaching, assembly water jet cutter cutting, accessory installing and checking boxing. By means of the method, technological processes are simple, the input of the production link and the input of tools are reduced, the labor cost is reduced, the problems that a carpet manufactured through a traditional technology is poor in VOC and high in weight are solved, the design requirement for the overall small weight is met, the overall VOC performance isimproved, no harmful substance is generated in the production process, and the automobile carpet sound insulation pad belongs to an environment-friendly product. By means of the one-time forming method, the indexes that the carpet is small in weight and good in VOC performance are achieved, noise in an automobile body is effectively lowered, the overall acoustic design requirement is met, and theinternational leading edge level is achieved.

The invention, which relates to the acoustic field of the room, discloses a pulse-response-based room sound propagation path separation method. According to the technical scheme, the method comprises: measurement is carried out to obtain a pulse response in a room; after the time-domain windowing cut-off operation and frequency-domain filter processing are executed on the pulse response, division of pulse response energy of the obtained part and total pulse response energy is carried out to obtain ratio values of acoustic energy of designated transmission paths to total acoustic energy; and then contributions of all acoustic propagation paths to a total sound pressure level in the room are separated and thus quantitative results of language privacy influences by all paths are obtained. With the method, the obtained acoustic propagation path separation result of the room can be used for an acoustic design of a newly open office or acoustic modification of an existing open office. The method has the following advantages: the universal and simple performances are good; the method is suitable for any room; no complicated theoretic modeling process is required; the method is easy to operate; and the result is reliable.

The invention discloses a composite structure acoustic design method based on the temperature-variable frequency-variable characteristic of a damping material, and the method comprises the steps: determining a damping loss factor and an elastic modulus of a viscous-elastic material along with the temperature and frequency changes, and building a composite structure acoustic model considering the temperature-variable frequency-variable characteristic of the damping material; therefore, the effect of the viscous-elastic material in practical application can be simulated more accurately, and scientific support is provided for vibration and noise reduction optimization design application of a composite structure.

An electro-optical device with a sound generating body is disclosed, in which an electro-optical device and a sound generating body can be mounted compactly and which can eliminate necessity of acoustic design of the sound generating body for an enclosure of an electronic apparatus for accommodating the electro-optical device. The electro-optical device of the present invention includes a first frame, a second frame opposed to the first frame, a third frame interposed between the first frame and the second frame, an electro-optical panel supported by the first frame, and a sound generating body supported by the second frame and covered by the second frame and the third frame, the sound generating body being arranged so as to be two-dimensionally overlapped the electro-optical panel.

The invention provides an ultra-thin speaker system. The ultra-thin speaker system comprises an impedance matcher, a speaker monomer and a speaker rear cavity, wherein the speaker monomer is connected between the impedance matcher and the speaker rear cavity, one end of the impedance matcher is seamlessly connected with the speaker monomer, and the other end of the impedance matcher is used as a sound outlet end; and the section of the impedance matcher is flat, and the sectional area of the flat cross is gradually extended from the seamless connection end between the speaker monomer and the flat section to the sound outlet end. According to the ultra-thin speaker system, better impedance matching between a speaker and air in an external space can be generated and higher radiation efficiency can be achieved in a space with limited thickness by utilizing the structure and acoustic design means as well as the impedance matcher with the flat section, so that improvement on the maximum volume of the speaker of ultra-thin electronic products is facilitated.

The invention discloses a road sound barrier acoustic design simulation calculation method, which comprises the following steps of: regarding driving noise on a road as a continuous line sound source, performing most unfavorable noise calculation on a sound source point closest to a sensitive point, calculating a standard exceeding range caused by the most unfavorable noise point, and preliminarily simulating the length and the height of a sound barrier in combination with the range, so as to obtain a sound barrier acoustic design simulation result. And calculating the insertion loss of the sound barrier to obtain a proper length and height combination. When the most unfavorable noise of the sound source point is calculated, traffic volume calculation, noise contribution value calculation, environment reduction, distance attenuation and insertion loss calculation are fully considered, and the calculation precision is high; a pure mathematical calculation mode established on the basis of a table EXCEL is adopted for calculation, digital simulation is achieved by converting traffic factors, environmental factors and space needed by acoustic calculation into digital simulation, the road acoustic calculation threshold is lowered, and the digital calculation vacancy of road acoustic design is filled up.

The invention discloses a telephone receiver which comprises a telephone receiver single body and a sound conduit. A vibrating diaphragm, a basin frame and a support of the telephone receiver single body form a telephone receiver internal cavity. The sound conduit is arranged at the back of the telephone receiver single body and comprises a sealing end and an opening end. The sealing end is communicated with the telephone receiver internal cavity through an inner side opening in the basin frame. The open end is provided with a through hole communicated with the outside. By means of the technical scheme, the space of the back of the telephone receiver single body can be fully utilized, the size of the telephone receiver is reduced, so that the structural size of the whole telephone receiver meets usage requirements, meanwhile, the resonant frequency of the telephone receiver can be reduced effectively, the low-frequency performance of the telephone receiver is improved, the low-frequency performance of an earphone is improved accordingly, and limit of the acoustic design of the earphone on the appearance design is lowered.

The invention belongs to the technical field of sound absorption materials, and relates to a cement-based fly ash floating bead sound absorption material and a preparation method thereof. The cement-based fly ash floating bead sound absorption material is provided on the first aspect and comprises a mixture of fly ash floating beads, cement and a water reducing agent, and the mass ratio of the fly ash floating beads to the cement to the water reducing agent is (70-110): 100: 0.6. The sound absorption coefficient of the cement-based fly ash floating bead sound absorption material provided by the invention is higher than that of a common porous sound absorption material especially at a low-frequency band, the cement-based fly ash floating bead sound absorption material can be expected to be used for various sound absorption structures and indoor and outdoor spaces needing acoustic design, and accumulation of byproducts and pollution to the environment can be effectively reduced; the method conforms to the national development strategy of energy conservation and emission reduction, the production amount of traditional cement-based sound absorption material aggregates such as rubber particles can be reduced, and resources are saved.

A loudspeaker placement visualizer system includes a calibrated adjustable laser beam tool that can generate a beam cone angle corresponding to the predetermined sound dispersion angle of a loudspeaker. The tool is secured parallel to the central axis of the loudspeaker and adjusted to the predetermined sound dispersion angle to show what the acoustic coverage area of the loudspeaker will be in a particular venue. The laser beam projector has a cylindrical main body with an external reference indicator and a forward section that is rotatable relative to the main body to adjust the laser beam cone angle. The forward section has a calibrated scale proximate the reference indicator to enable the user to set and to see the beam cone angle. The tool may also be used during venue survey and acoustic design to determine the required sound dispersion angle of a loudspeaker to be installed.