Vehicle-mounted special-shaped structure self-adaptive loudspeaker system

Abstract

The invention discloses a vehicle-mounted special-shaped structure self-adaptive loudspeaker system, which relates to the technical field of electroacoustic transducers and vehicle-mounted audio systems and comprises a special-shaped vibrating diaphragm module, a magnetic circuit driving module and a boundary coupling module. The special-shaped vibrating diaphragm module is in a non-axisymmetric shape, and a non-uniform stiffness gradient is constructed through local physical thickening or carbon fiber reinforcement, so that the stiffness of the vertex is greater than that of the center to suppress segmentation vibration; the magnetic circuit driving module utilizes asymmetric magnetic gaps with gradually-changed widths to be matched with variable-density coils to balance stress distribution of long and short shafts so as to correct driving distortion; the boundary coupling module integrates a shape memory alloy framework and a flexible sealing body, and self-adaptive radial expansion locking of a mounting interface is achieved. Through the design, the problems of vibration mode disorder and complex space sealing adaptation of the special-shaped loudspeaker are solved, sound short circuit is effectively eradicated, resonance is isolated, and the tone quality reduction degree and transient response performance of a non-standard installation position in a cabin are improved.

Description

Technical Field

[0001] This application relates to the field of electroacoustic transducers and vehicle audio systems, and in particular to vehicle-mounted adaptive speaker systems with irregular structures. Background Technology

[0002] As automotive design continues to evolve, the interior space of modern vehicle cabins is becoming increasingly compact. In pursuit of ultimate interior aesthetics and space utilization, the installation locations reserved for in-vehicle speakers often exhibit irregular geometric shapes. Traditional axisymmetric circular speakers struggle to fully utilize narrow or irregularly shaped acoustic cavity spaces such as A-pillars, door corners, or dashboard edges. Therefore, non-circular (such as triangular, racetrack-shaped, etc.) irregularly shaped speakers are gradually becoming an important choice for the acoustic arrangement of intelligent cockpits.

[0003] However, irregularly shaped loudspeakers face technical bottlenecks in terms of both physical acoustic performance and engineering implementation. Regarding the vibration system, because the irregular diaphragm breaks the geometric symmetry of a circle, the distances from various points on its surface to the drive center are inconsistent, resulting in extremely complex stiffness distribution characteristics. If a traditional diaphragm design with uniform material is used, nonlinear segmented vibration modes are easily generated at the apex or edges with large curvature due to insufficient stiffness. This uncontrollable modal response can cause severe frequency response peaks and troughs and phase distortion, resulting in muddy sound quality and poor transient response.

[0004] In magnetic circuit drive systems, the Lorentz force distribution experienced by irregularly shaped voice coils in the magnetic gap is often difficult to perfectly match with the load distribution of the diaphragm. Traditional uniform-width magnetic gap designs cannot compensate for the difference in lever arm and uneven mass distribution of irregularly shaped voice coils along their major and minor axes. This makes the voice coil prone to wobbling or deflection during long-stroke movements, resulting in voice coil rubbing or increased harmonic distortion, thus limiting the maximum undistorted sound pressure level of the loudspeaker.

[0005] Furthermore, in terms of assembly and integration processes, irregularly shaped speakers typically need to be embedded deep within or at the edge of the vehicle body structure, resulting in limited operating space. Traditional screw fastening methods are often difficult to implement due to the inability of tools to reach the area. More critically, the sealing interface of irregularly shaped profiles makes it difficult to ensure a perfect fit. Even tiny gaps in the mounting surface can lead to acoustic short circuits, causing a sharp attenuation of low-frequency energy. Moreover, rigid connections cannot effectively isolate resonance from the vehicle body sheet metal, further deteriorating the acoustic environment inside the vehicle. Therefore, designing an irregularly shaped speaker system that can self-compensate acoustically and mechanically and adapt to complex installation boundaries has become a problem that needs to be solved in the field of automotive electroacoustics. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive loudspeaker system for vehicle-mounted irregular structures, which at least solves the technical problems of diaphragm segmentation vibration distortion and uneven magnetic circuit driving force distribution caused by the non-axisymmetric geometry of existing irregular loudspeakers, as well as the difficulty in installation and adaptation in the complex and confined space of a vehicle and the difficulty in ensuring acoustic airtightness.

[0007] This invention provides the following solution:

[0008] This invention provides an adaptive speaker system with an irregular structure for vehicles, which mainly consists of an irregular diaphragm module, a magnetic circuit drive module, and a boundary coupling module.

[0009] The irregularly shaped diaphragm module is configured with a non-axisymmetric geometry, such as a triangular profile, to adapt to the limited installation space within a vehicle cabin. To address the issues of segmented vibration and stress concentration caused by the non-axisymmetric shape during vibration, the irregularly shaped diaphragm module is designed with a non-uniform stiffness gradient distribution. Specifically, the irregularly shaped diaphragm module includes a central region located at the geometric center and vertex regions located at the geometric edges, with the equivalent stiffness of the vertex regions set to be greater than that of the central region.

[0010] In terms of material composition, the main body of the irregular diaphragm module can adopt a borosilicate aluminum honeycomb sandwich structure, which is composed of an upper skin, a middle honeycomb core layer, and a lower skin. For the vertex region where high stiffness is required, the system adopts a local reinforcement scheme: one method is to construct a local physical thickening structure, which is integrally formed or bonded to the base layer; the other method is to lay a carbon fiber reinforcement layer on the surface of the vertex region, and the carbon fibers are arranged parallel to the angle bisector or in a symmetrical cross arrangement, thereby realizing the physical control of the vibration mode.

[0011] The magnetic circuit drive module is configured to provide a non-uniformly distributed magnetic driving force to match the dynamic characteristics of the irregularly shaped diaphragm. This module includes a magnetic guide assembly, a magnet assembly, and a voice coil assembly suspended in the magnetic gap. To optimize the stress state of the non-axisymmetric voice coil, the magnetic gap defined by the magnetic guide assembly is configured as an asymmetrical structure with a width varying along the circumferential direction. Specifically, the cross-sectional shape of the T-shaped iron core of the magnetic guide assembly is designed as a near-elliptical or rounded polygon, and combined with the non-equidistant design of the inner hole contour of the clamping plate, the magnetic gap width corresponding to the long axis region of the voice coil assembly is smaller than the magnetic gap width corresponding to the short axis region.

[0012] This differentiated design of the magnetic gap width enhances the magnetic induction intensity in the long axis region, compensating for the mechanical losses of irregularly shaped coils at the long axis. Furthermore, the magnet assembly can employ a side-mounted NdFeB dual-ring architecture, including a main drive ring positioned on the main flux path and a compensation ring positioned on the edge path, further correcting the magnetic field distribution.

[0013] The voice coil assembly is designed to match the magnetic circuit structure, and includes a voice coil skeleton and coil windings. To improve driving efficiency and linearity within a limited stroke, the coil windings are axially divided into a central winding region and an edge winding region (i.e., the axial end region), with the coil winding density in the edge winding region being greater than that in the central winding region. Simultaneously, the surface of the voice coil skeleton is enhanced with positioning grooves or coated with thermosetting adhesive to improve the coil's adhesion stability under high dynamic conditions.

[0014] The boundary coupling module addresses the sealing and fit issues between the speaker system and the vehicle body mounting location. Located at the outer periphery of the system, this module employs a composite material layered structure, comprising an inner flexible seal made of fluorosilicone rubber and an outer rigid skeleton. The outer rigid skeleton can be made of titanium alloy shape memory rings or nickel-titanium-based shape memory alloys, utilizing their material properties to achieve an interference fit.

[0015] To prevent excessive expansion, a mechanical limiting structure is integrated into the outer rigid frame, configured as an expansion stop with a C-shaped opening. When the frame expands to the preset maximum diameter, the limiting hooks at both ends of the opening engage with each other or the stop structures interfere with each other, locking the geometry. In addition, the system's outer frame also integrates pre-compression snap-fit ​​components spaced circumferentially and a guide groove structure filled with thixotropic sealant, achieving dual fixation through mechanical locking and chemical sealing.

[0016] The above solution achieves the following beneficial technical effects:

[0017] This application employs a non-uniform stiffness gradient diaphragm module, specifically setting the equivalent stiffness of the apex region to be greater than that of the center region, and combining it with local physical thickening or carbon fiber reinforcement technology. This effectively suppresses the segmented vibration modes and edge stress concentration phenomena that are prone to occur under high-speed vibration of the non-axisymmetric diaphragm, ensuring that the non-axisymmetric diaphragm can maintain ideal piston-like motion over a wide frequency range. This improves the transient response capability and sound reproduction of the speaker within the limited vehicle installation space.

[0018] This application utilizes a synergistic design of an asymmetric magnetic gap structure and variable-density coil windings. By making the magnetic gap width in the long axis region of the voice coil assembly smaller than that in the short axis region, and increasing the coil winding density at the axial end, it specifically compensates for the differences in electromagnetic coupling efficiency of irregularly shaped voice coils at different geometric positions. This balances the Lorentz force distributed along the circumference of the irregular voice coil, effectively correcting the nonlinear distortion of the magnetic circuit drive system and ensuring the output stability of the loudspeaker under high dynamic operating conditions.

[0019] This application utilizes a boundary coupling module comprising a rigid skeleton made of shape memory alloy and a flexible sealant, combined with a mechanical limiting structure and thixotropic sealant, to achieve adaptive radial expansion locking over complex vehicle mounting interfaces. This structure not only simplifies the assembly process of irregularly shaped speakers and solves the problem of difficult operation when using traditional screws in confined spaces, but also establishes an integrated airtight physical barrier, effectively preventing acoustic short circuits and blocking the interference of body panel resonance on sound quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the irregular diaphragm module structure of the vehicle-mounted irregular structure adaptive speaker system according to an embodiment of the present invention;

[0021] Figure 2 This is a flowchart illustrating the method for optimizing the stiffness distribution of irregularly shaped diaphragms according to an embodiment of the present invention.

[0022] Among them, 200 is the irregular diaphragm module; 201 is the micro unit; 202 is the piston motion area; 203 is the vertex area; 204 is the central area; 205 is the carbon fiber reinforcement layer; and 206 is the base layer. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] See attached document Figure 1 To be continued Figure 2 This invention provides an in-vehicle adaptive speaker system with an irregular structure, comprising an irregular diaphragm module 200, a magnetic circuit drive module, and a boundary coupling module. The irregular diaphragm module 200, serving as the system's main sound radiator, is configured with a non-axisymmetric geometry to adapt to the irregular installation space of the vehicle's interior.

[0025] The main body of the irregular diaphragm module 200 is made of a honeycomb sandwich structure of aluminum borosilicate. This sandwich structure has a total thickness of 0.8 mm and consists of an upper skin, a middle honeycomb core layer, and a lower skin, used to reduce vibrating mass while ensuring structural strength. The geometric contour of the irregular diaphragm module 200 is an irregular shape, such as a triangle, a trapezoid, or any polygon defined by the junction area between the vehicle's A-pillar and the dashboard.

[0026] To address the acoustic response distortion caused by irregular shapes, the physical property distribution of the irregularly shaped diaphragm module 200 is determined based on a topology optimization algorithm. Specifically, the surface of the irregularly shaped diaphragm module 200 is virtually discretized into N independent micro-units 201. Each micro-unit 201 has independent material property parameters, including Young's modulus and physical thickness.

[0027] A finite element simulation model of the irregular diaphragm module 200 was established, which coupled the sound pressure distribution with the mechanical motion characteristics of the diaphragm. The stiffness distribution of each micro-unit 201 was iteratively calculated using a genetic algorithm. The objective function of this iterative calculation was set to maximize the area proportion of the piston motion region 202 on the surface of the irregular diaphragm module 200. The convergence condition for the iterative calculation was set as the proportion of the piston motion region 202 in the total surface area of ​​the irregular diaphragm module 200 being greater than or equal to 85%. Mass constraints and first-order resonant frequency constraints were also introduced during the iterative calculation.

[0028] Specifically, the total mass increase of the irregular diaphragm module 200 shall not exceed 15% relative to the initial model before optimization, and the first-order bending resonance frequency of the irregular diaphragm module 200 shall be higher than 1.2 times the upper limit of the system's operating frequency band (i.e., higher than 12kHz) to prevent excessive mass or mode shift caused by stiffness optimization.

[0029] Based on the stiffness distribution map generated by the above iterative calculations, the irregular diaphragm module 200 exhibits a non-uniform stiffness gradient distribution in its physical structure. Specifically, the irregular diaphragm module 200 includes a central region 204 located at the geometric center and vertex regions 203 located at the geometric edges or sharp corners. The vertex regions 203 correspond to the calculated high stress concentration areas.

[0030] The equivalent stiffness of the irregular diaphragm module 200 in the vertex region 203 is configured to be 1.8 times that of the equivalent stiffness in the central region 204. This stiffness difference is achieved through local structural reinforcement.

[0031] In one specific implementation, the vertex region 203 undergoes a localized physical thickening treatment. Compared to the central region 204, the thickness of the vertex region 203 is increased by 0.2 mm. This thickened portion is integrally formed with or bonded to the base layer 206 of the borosilicate honeycomb sandwich structure. Specifically, during the manufacturing process, the upper and lower skins are hot-pressed together with the intermediate honeycomb core layer using a high-temperature resistant epoxy resin film. The hot-pressing process is set at a temperature of 130°C to 150°C, with a pressure maintained at 0.3 MPa to 0.5 MPa, for a duration of 45 to 60 minutes to ensure that the sandwich structure does not delaminate during subsequent large-amplitude movements.

[0032] In another specific implementation, the irregular diaphragm module 200 also includes a carbon fiber reinforcement layer 205. The carbon fiber reinforcement layer 205 is laid on the surface of the vertex region 203. The number of layers and fiber orientation of the carbon fiber reinforcement layer 205 are determined according to the principal stress direction calculated by the finite element simulation model, so as to suppress the segmented vibration modes of the irregular diaphragm module 200 in the operating frequency band.

[0033] Through the above stiffness gradient distribution design, the vibration amplitude of different regions of the irregular diaphragm module 200 remains consistent during operation, thereby enabling the irregularly shaped diaphragm to simulate the piston-like motion behavior of a regular circular diaphragm and reducing acoustic phase interference and frequency response peaks and valleys caused by shape asymmetry.

[0034] The magnetic circuit drive module is configured to provide driving force to the irregular diaphragm module 200, which includes a magnetic conductor assembly, a magnet assembly, and a voice coil assembly disposed in a magnetic field.

[0035] The magnetic conductor assembly includes a T-iron and an upper clamp. An air gap, which is the magnetic gap, is defined between the T-iron and the upper clamp. Due to the non-circular irregular profile of the voice coil assembly (e.g., triangular or racetrack-shaped), the Lorentz force experienced by the voice coil assembly at different locations in the circumferential direction exhibits potential inhomogeneity. To eliminate this inhomogeneity, the magnetic gap is designed as an asymmetric magnetic gap structure.

[0036] Specifically, the width of the magnetic gap is not a fixed value, but a function that varies along the circumference. In the long axis region of the voice coil assembly or in areas of relatively weak stress, the radial distance between the T-iron and the upper clamp is reduced, forming a narrow magnetic gap region; in the short axis region of the voice coil assembly, the radial distance is relatively widened, forming a wide magnetic gap region. This asymmetric magnetic gap structure is achieved by modifying the cross-sectional shape of the T-iron's central column. The central column cross-section of the T-iron is machined into a near-elliptical or rounded polygon, while the inner hole profile of the upper clamp is configured with a non-circular geometry, forming a non-equidistant fit with the central column cross-sectional profile of the T-iron. By changing the normal distance between the outer surface of the T-iron's central column and the inner surface of the upper clamp's inner hole, a gradually varying magnetic flux path length is constructed in physical space. This asymmetric design of the physical structure is used to compensate for differences in magnetic flux distribution. After adjustment by this asymmetric structure, the difference in magnetic flux density along the entire circumferential path of the magnetic gap is controlled within 5%.

[0037] The magnet assembly employs a side-mounted NdFeB dual-magnetic-ring architecture, comprising a main driving magnetic ring and a compensating magnetic ring. The main driving magnetic ring is positioned on the main magnetic flux path of the magnetic circuit, establishing the main magnetic field in the central region of the magnetic gap, where the magnetic flux density is set at 1.2T. The compensating magnetic ring is positioned at the edge of the magnetic circuit or on the leakage magnetic path, correcting and focusing the magnetic field lines distribution in the edge region of the magnetic gap; its corresponding compensating magnetic gap region has a magnetic flux density set at 1.05T. This dual-magnetic-ring layout improves magnetic energy utilization and corrects magnetic field distortion caused by irregular structures.

[0038] The voice coil assembly is suspended in the magnetic gap and includes a voice coil skeleton and a coil winding wound around the skeleton. The coil winding is manufactured using a segmented variable density winding process. The coil winding is axially divided into a center winding region and an edge winding region.

[0039] The center winding region is located in the middle of the axial height of the coil winding and has the first linear density (number of turns per unit length). The edge winding regions are located at both ends of the coil winding along the axial direction. In the edge winding regions, the winding density of the coil is increased by 20% relative to the first linear density. This density distribution design is based on a magnetic field attenuation model: the magnetic induction intensity B typically attenuates at both ends of the magnetic gap. This is achieved by increasing the wire length in the edge regions. (i.e., increasing the turns density), so that the product (in The current remains constant during the long stroke of the voice coil.

[0040] To prevent uneven stacking of wire layers caused by variable density winding, the voice coil skeleton surface is pre-formed with positioning grooves or coated with thermosetting adhesive. In this embodiment, the thermosetting adhesive preferably uses a polyamide-imide (PAI) resin substrate, which has a heat resistance temperature of over 200°C, effectively preventing the coil from falling off under high power operation. In another embodiment, a modified epoxy resin-based adhesive can also be used to obtain better chemical stability. The coil winding leads (brocade wires) are anchored to the stress neutral layer of the skeleton by adhesive bonding and are arranged in an S-shape to release the non-axial torsional stress generated during the movement of the irregular voice coil.

[0041] Through the combination of the asymmetric magnetic gap and the variable density winding, the fluctuation of the force coefficient (BL value) of the magnetic circuit drive module within the entire effective stroke range of the voice coil assembly is limited to within ±4%, thereby suppressing the intermodulation distortion and harmonic distortion of the loudspeaker under high dynamic operation.

[0042] The boundary coupling module is located at the outer periphery of the speaker system and is configured to establish a flexible connection interface between the support frame of the irregular diaphragm module 200 and the irregular mounting surface of the vehicle interior trim. The boundary coupling module adopts a composite material laminate structure, which consists of an inner flexible seal and an outer rigid skeleton.

[0043] The main material of the inner flexible seal is fluorosilicone rubber. The physical hardness of this material is set at Shore hardness 60°. Fluorosilicone rubber was chosen based on its viscoelasticity retention over a wide temperature range, ensuring that the boundary coupling module does not undergo embrittlement or permanent plastic deformation in an ambient temperature range of -40°C to 150°C, thereby maintaining constant rebound stress.

[0044] The outer rigid skeleton is composited onto the outer surface of the inner flexible seal or embedded within it. The boundary coupling module is manufactured using an inlay injection molding process. First, a pre-formed titanium alloy shape memory ring is placed in a predetermined position within the mold cavity and secured using magnetic locating pins or mechanical locking points within the mold; then, liquid fluorosilicone rubber is injected. During vulcanization, the fluorosilicone rubber chemically bonds with the primer pre-coated on the titanium alloy surface, forming an integrated interface bonding layer with a peel strength greater than 8 N / mm. The outer rigid skeleton is a 0.1 mm thick titanium alloy shape memory ring. This titanium alloy shape memory ring has shape memory characteristics and is preset to have a geometry slightly larger than the vehicle mounting holes. The function of the outer rigid skeleton is to provide a constant radial expansion force or axial clamping force, compensating for the damping hysteresis of the rubber material under high-frequency vibrations through the elastic modulus of the metal.

[0045] The boundary coupling module compensates for dimensional tolerances of the mounting surface through a pre-compression deformation mechanism. In its free state, the outline dimensions of the boundary coupling module are larger than the outline dimensions of the vehicle's irregular mounting slot. When the speaker system is pushed into the mounting position, the boundary coupling module undergoes elastic compressive deformation. This structure is configured to adapt to and fill irregular gaps ranging from 0.2mm to 1.5mm.

[0046] During installation, the deformation of the boundary coupling module is controlled by applying a specific tightening torque. The standard installation torque set by the system is 1.5 N·m, with a tolerance range of ±0.3 N·m. Under this torque, the outer rigid skeleton undergoes elastic buckling, forcing the inner flexible seal to fit tightly into the surface texture of the vehicle's interior trim.

[0047] This composite preload structure physically blocks the communication path between the front and rear acoustic waves of the irregular diaphragm module 200, preventing acoustic short circuits. Simultaneously, the complementary design utilizing the difference in thermal expansion coefficients between titanium alloy and fluorosilicone rubber limits the relative displacement of the speaker under 80°C thermal cycling conditions, keeping it below 0.1mm and ensuring structural stability for long-term use.

[0048] This embodiment specifically discloses a triangular speaker system adapted to the junction area between the A-pillar and the dashboard of a vehicle. This junction area is enclosed by vehicle body structural components to form an irregular triangular mounting cavity with an acute angle of approximately 30 degrees. To accommodate this cavity, the physical outline of the triangular speaker system is configured as a triangular structure that matches its geometric features.

[0049] In this embodiment, the main substrate of the irregular diaphragm module is made of aluminum borosilicate honeycomb sandwich panel, and its total physical thickness is precisely controlled to 0.8 mm. Based on the triangular geometry, the three corner regions of the diaphragm are defined as high-stiffness areas. In these high-stiffness areas, multiple layers of unidirectional carbon fiber reinforcing fabric are laid using a lamination process. The fiber orientation of the carbon fiber reinforcing fabric is configured to be parallel to the angle bisector of the corresponding angle of the triangle or to be symmetrically arranged at an angle (e.g., ±45 degrees) with the angle bisector, thereby enhancing the ability to withstand concentrated stress at the corners and suppressing split vibrations.

[0050] The magnetic circuit drive module is configured as a side-mounted dual magnetic ring structure to accommodate the dimensional constraints of the triangular geometry in the depth direction. The main magnetic ring uses N45SH grade neodymium iron boron permanent magnet material, and the magnetic field lines it generates are designed to pass perpendicularly through the main magnetic gap, thereby establishing a main magnetic flux density of 1.2T at the center plane of the voice coil's trajectory. The auxiliary compensation magnetic ring is located on the side of the magnetic circuit system to establish a compensation magnetic field of 1.05T at the edge of the magnetic gap. This compensation magnetic field is used to correct the magnetic field line divergence at the sharp corners of the triangular voice coil.

[0051] Regarding the system's installation and mounting interface, the outer frame of the triangular speaker system integrates pre-compression snap-fit ​​components and a guide groove structure. The pre-compression snap-fit ​​components are spaced circumferentially along the triangular frame and configured to mechanically engage and lock with corresponding fasteners on the vehicle's interior trim panel. The guide groove structure is a continuous groove section along the speaker's sealing edge, pre-filled with a thixotropic sealant material. In this embodiment, a single-component polyurethane sealant is used, which has excellent elasticity and weather resistance. Alternatively, depending on the different vehicle body material requirements, a modified silane sealant can be used to achieve primerless bonding.

[0052] During installation, when the triangular speaker system is pushed into the vehicle's mounting cavity, the pre-pressurized snap-fit ​​assembly first engages with the vehicle's structural components, providing initial axial clamping force. Subsequently, the boundary coupling module undergoes elastic deformation under a set installation torque of 1.5 N·m, forcing the sealant within the adhesive guide groove structure to extend and fill the microscopic installation gaps. This composite connection method of mechanical locking and adhesive sealing is configured to maintain the system's airtightness under vehicle vibration conditions.

[0053] The physical structure design of this embodiment takes thermodynamic stability into account. Under high-temperature thermal cycling conditions of 80°C, relying on the low coefficient of thermal expansion of the aluminum borosilicate material and the elastic compensation margin of the boundary coupling module, the relative thermal deformation displacement between the components of the system is limited to within 0.1 mm. Simultaneously, the acoustic response characteristics of the system are configured such that the fluctuation range of its axial sound pressure level response curve remains within ±2.1 dB within the effective operating frequency band of 100 Hz to 10 kHz.

[0054] Referring to the aforementioned basic architecture, the implementation of the present invention is not limited to the specific materials or single structural form mentioned above. While maintaining the core functional logic, each sub-module can be implemented using alternative technical means.

[0055] Regarding the material composition of the irregular diaphragm module 200, in another embodiment, the main substrate of the diaphragm is configured as a carbon fiber woven composite layer structure to replace the aluminum borosilicate honeycomb structure. This carbon fiber woven composite layer is formed by hot pressing multiple layers of carbon fiber prepreg, and the matrix resin is a high-temperature resistant epoxy resin. To reproduce the aforementioned stiffness gradient distribution characteristics, this embodiment employs a variable-angle layup process. Specifically, in the geometric center region of the diaphragm, the weaving angle of the carbon fiber bundles is set to 0 degrees / 90 degrees orthogonally laid; while in the high-stress regions at the apex or edge of the diaphragm, the layup angle of the carbon fiber bundles is adjusted to ±45 degrees or an additional unidirectional reinforcing layer is added. By adjusting the number and angle of the layups, the difference in equivalent bending stiffness between this alternative material scheme and the original scheme in the corresponding region is controlled within 10%, thereby maintaining the same acoustic radiation modes.

[0056] Regarding the compensation mechanism of the magnetic circuit drive module, in some embodiments with manufacturing limitations, the magnetic gap can be configured as a conventional uniform magnetic gap structure with equal width. In this case, the compensation for magnetic field non-uniformity is entirely undertaken by structural adjustments to the voice coil assembly. Specifically, the voice coil winding not only employs the aforementioned axial variable density winding but also incorporates radial multi-layer differentiated winding technology. In the long axis region of the voice coil corresponding to the weaker magnetic field, the number of winding layers is locally increased (e.g., from 2 layers to 4 layers), or finer wires are used for high-density winding. Through this purely circuit-level structural adjustment, the distribution of the Ampere force in the circumferential direction is adjusted without changing the physical shape of the magnet, thus achieving smoothing of the BL value.

[0057] Regarding the rigid skeleton material of the boundary coupling module, in one embodiment with active fastening function, the outer rigid skeleton is made of a nickel-titanium-based shape memory alloy to replace the titanium alloy shape memory ring. The phase transformation temperature threshold of this shape memory alloy is set to 50°C. At room temperature, the skeleton is in the martensitic phase, exhibiting low yield strength, facilitating installation deformation to adapt to irregular gaps. When the speaker system generates heat or external auxiliary heating causes the skeleton temperature to reach the 50°C threshold, the material undergoes a reverse martensitic phase transformation to the austenitic phase, automatically restoring to the preset memory shape. This phase transformation process generates continuous active contraction or expansion stress, further enhancing the clamping force and sealing effect of the boundary coupling module on the vehicle interior mounting surface. Furthermore, to prevent the shape memory alloy from generating excessive expansion force at extreme temperatures that could crush the vehicle interior mounting groove wall, a mechanical limiting structure is also designed on the outer rigid skeleton. The mechanical limiting structure is configured as the expansion stop of the C-shaped opening. When the skeleton expands to the preset maximum diameter, the limiting hooks at both ends of the opening engage with each other (or the stop structures at both ends of the opening interfere with each other), thereby limiting further deformation and displacement.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle-mounted adaptive speaker system with irregular structure, characterized in that, include: Irregular diaphragm module, magnetic circuit drive module, and boundary coupling module; The irregular diaphragm module is configured with a non-axisymmetric geometry. The irregular diaphragm module includes a central region located at the geometric center and vertex regions located at the geometric edges. The irregular diaphragm module has a non-uniform stiffness gradient distribution, and the equivalent stiffness of the vertex regions is greater than that of the central region. The magnetic circuit drive module includes a magnetic guide component, a magnet component, and a voice coil component disposed in a magnetic field. The magnetic guide component defines a magnetic gap, and the voice coil component is suspended in the magnetic gap. The boundary coupling module is located at the outer periphery of the vehicle-mounted irregular structure adaptive speaker system.

2. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The main material of the irregular diaphragm module is a borosilicate aluminum honeycomb sandwich structure, which consists of an upper skin, a middle honeycomb core layer and a lower skin. The enhancement structure of the vertex region includes one of the following structures: a local physical thickening structure; A carbon fiber reinforcement layer laid on the surface of the vertex region.

3. The vehicle-mounted irregular-structure adaptive speaker system according to claim 2, characterized in that, The equivalent stiffness of the vertex region is configured to be 1.5 to 2.5 times that of the equivalent stiffness of the center region; When the vertex region has a local physical thickening structure, the thickness of the vertex region is increased compared to the center region. The local physical thickening structure is integrally formed with the base layer of the aluminum borosilicate honeycomb sandwich structure or fixed by adhesive bonding. When a carbon fiber reinforcement layer is laid on the surface of the vertex region, the fiber arrangement direction of the carbon fiber reinforcement layer is parallel to the direction of the angle bisector corresponding to the vertex region or is arranged symmetrically to the angle bisector.

4. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The magnetic gap is configured as an asymmetric magnetic gap structure, and the width of the magnetic gap varies along the circumferential direction; the magnetic guiding assembly includes a T-iron and an upper clamping plate, the cross-sectional shape of the central column of the T-iron is elliptical or rounded polygonal, and the inner hole contour of the upper clamping plate and the cross-sectional contour of the central column of the T-iron form a non-equidistant fit, so that the width of the magnetic gap in the region corresponding to the long axis of the voice coil assembly is smaller than the width in the region corresponding to the short axis of the voice coil assembly.

5. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The magnet assembly adopts a side-mounted neodymium iron boron dual magnetic ring architecture, and the magnet assembly includes a main driving magnetic ring and a compensation magnetic ring; The main driving magnetic ring is disposed on the main magnetic flux path of the magnetic circuit drive module, and the compensation magnetic ring is disposed on the edge path of the magnetic circuit drive module.

6. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The voice coil assembly includes a voice coil skeleton and a coil winding wound on the voice coil skeleton; The coil winding is divided into a central winding area and an end winding area in the axial direction, and the coil winding density of the end winding area is greater than that of the central winding area. The voice coil skeleton surface is provided with positioning grooves or coated with thermosetting adhesive paint, wherein the thermosetting adhesive paint is a polyamide-imide resin-based adhesive paint or a modified epoxy resin-based adhesive paint.

7. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The boundary coupling module adopts a composite material laminate structure, and the boundary coupling module includes an inner flexible sealing body and an outer rigid skeleton. The inner flexible sealing body is made of fluorosilicone rubber, and the outer rigid skeleton is composited on the outer surface of the inner flexible sealing body or embedded inside the inner flexible sealing body.

8. The vehicle-mounted irregular-structure adaptive speaker system according to claim 7, characterized in that, The outer rigid skeleton is made of titanium alloy memory ring or nickel-titanium based shape memory alloy; the outer rigid skeleton is provided with a mechanical limiting structure, which is configured as an expansion stop of a C-shaped opening. When the outer rigid skeleton expands to the preset maximum diameter, the limiting hooks at both ends of the C-shaped opening engage with each other or the stop structures at both ends of the C-shaped opening interfere with each other.

9. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The physical outline of the irregular diaphragm module is configured as a triangular structure, and the vertex region corresponds to the three corner regions of the triangular structure; The voice coil assembly has a triangular profile; The magnetic field lines generated by the main drive magnetic ring of the magnetic circuit drive module pass perpendicularly through the magnetic gap, and the compensation magnetic ring is located on the side of the magnetic circuit drive module.

10. The vehicle-mounted irregular-structure adaptive speaker system according to claim 1, characterized in that, The system also includes an outer peripheral frame, on which a pre-compression snap-fit ​​assembly and an adhesive guide groove structure are integrated; The pre-pressed snap-fit ​​components are distributed circumferentially along the outer peripheral frame. The adhesive guide groove structure is opened along the sealing edge and filled with thixotropic sealant material. The thixotropic sealant material is a one-component polyurethane sealant or a modified silane sealant.

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