18 results about "Neutral plane" patented technology

An aircraft wing including a wing structure supporting a wing cover having an outer aerodynamic surface, and a pop-up spoiler unit including an actuation mechanism and a spoiler coupled to the actuation mechanism. The spoiler is moveable by the actuation mechanism to deploy through an aperture in the wing cover. The pop-up spoiler unit is mounted to the wing structure to be substantially isolated from wing bending deflections. The wing structure has a neutral plane which is substantially neither stretched nor compressed during bending of the wing structure. The pop-up spoiler unit is mounted to the wing structure at only two pin joints each having a respective pin axis about which the pop-up spoiler unit is substantially free to rotate, and each pin axis substantially lies in the neutral plane.

Tape for a fabric compacting machine (1), including: an internal base fabric (6) for compaction felts (4); a first layer (7) of felt fixed on a first side of said internal base fabric (6) by a process of needling of felt fibers through a thickness of said internal base fabric (6); a second elastically deformable layer (8) composed of silicone or rubber fixed on a second side of said internal base fabric (6) opposite to said first side, wherein said first layer (7) and said second layer (8) have respective thicknesses determined such that a neutral plane of a bending stress along the thickness of the tape lies within the thickness of said internal base fabric (6).

The present invention relates to an adaptive multi-neutral plane turntable and an adjustment method thereof, belonging to the field of high-precision turntables. It is intended to solve the demand for high-precision and flexible adjustment of turntables in complex measurement and industrial application scenarios. The turntable is provided with multiple neutral planes, and the position of the neutral planes can be matched in real time according to the actual measurement situation. The adjustment method is to match the nearest neutral plane according to the height of the initial centering section, and perform precise tilt adjustment around the center of the sphere of the neutral plane. The advantage is that it can minimize the influence of tilt adjustment on centering, ensuring that the turntable maintains stable and reliable performance in highly precise operations. The design of multiple neutral planes enables the turntable to adapt quickly under different working conditions, greatly improving the measurement efficiency and flexibility of industrial production, and effectively making up for the defect of insufficient adaptability of traditional turntables in complex environments.

A device (1) for blow-molding containers (10), which comprises a supporting frame for at least one blow-molding station (3) which comprises two lateral bodies (3a, 3b) and a bottom, each lateral body (3a, 3b) being associated with a respective mold part (4a, 4b), the mold parts (4a, 4b) being configured to form, when mutually adjacent, at least one blow-molding cavity for blow-molding at least one container (10), the lateral bodies (3a, 3b) being movable on command by way of cyclic opening and closing means (20) about an axis of articulation (101) defined at an interconnection shaft (5), the latter means being configured to move the blow-molding station (3) between an open condition, in which the lateral bodies (3a, 3b) are mutually angularly spaced apart around the axis of articulation (101), and a closed condition, in which the respective mold parts (4a, 4b) are mutually mated to form the molding cavity or cavities, each lateral body (3a, 3b) having at least one respective mating edge (11, 12), the latter edges being designed, in the closed condition of the blow-molding station (3), to be mutually mated in order to allow, during blow-molding operations, the mold parts (4a, 4b) to be locked together, the blow-molding station (3) comprising means for mutual locking (30) between the mating edges (11, 12) of the lateral bodies (3a, 3b) in a mutually-mated condition; the means for mutual locking (30) are arranged substantially at the neutral plane (200) of the portion of the lateral bodies (3a, 3b) that is located at the respective mutually-mated mating edges (11, 12).

An efficient machining method for a large conical part dense hole system comprises the steps that firstly, a neutral plane projection of each hole in a steel plate unfolding state is drawn, and a gas cutting sample plate is drawn with the inward deviation X of the projection size as the sample plate size; then marking out position lines of each hole on the workpiece to be processed, aligning a gas cutting sample plate with each hole position, and pre-cutting a bottom hole of each hole by using gas cutting equipment; then the workpiece is clamped and fixed through the fixing assembly; a rough boring cutter is used for conducting rough boring machining on all holes in the 1 / 3-1 / 2 area below the workpiece; a fine boring cutter is replaced to machine all the unthreaded holes to the finished product size; the fixing assembly is loosened, the workpiece is adjusted to rotate, the unmachined area of the workpiece is located below the workpiece, alignment is conducted with the small-end inner hole as the reference after adjustment, and the inner bottom hole in the other 1 / 3-1 / 2 area is machined to the size of a finished product; and the workpiece continues to be adjusted until all area holes are machined. The method is suitable for batch machining of all the holes in the large-angle conical surface, and reliable theoretical and practical bases are provided for machining of parts of the type.

The invention relates to the technical field of pile foundation engineering, and discloses a double-speed symmetrical superposition pipe pile integrity detection device which comprises a stress wave measurement assembly, a defect detection device and a calculation component. The defect detection device comprises a fixed part, two pointers are coaxially and rotatably arranged on the fixed part, the two pointers are symmetrically distributed on a neutral plane, the rotating centers of the two pointers are located at the center position of the fixed part, and an angle adjusting assembly is arranged in the fixed part and used for adjusting the two pointers to synchronously and relatively deflect. The device also comprises a speed detection assembly used for obtaining the deflection speed of the two pointers, and the calculation part carries out the calculation and analysis of the values obtained by the speed detection assembly and the stress wave measurement assembly. According to the invention, the low-strain detection precision of the pipe pile can be improved.

The invention discloses a static deflection calculation method, electronic equipment and a computer readable storage medium. The static deflection calculation method comprises the steps that the mass equivalent total bending moment of a cargo carrying table is obtained; the anti-bending section inertia moment of the stand column in the walking direction of the cargo carrying table is obtained; acquiring the height of the upright post, the elasticity modulus of the upright post, a first distance from the top end of the upright post to a forward wheel at the upper part of the cargo platform and the tread of the forward wheel of the cargo platform along the walking direction; based on the equivalent total bending moment, the anti-bending section inertia moment, the height, the elastic modulus, the first distance and the wheel track, the static deflection of the stand column is obtained. By means of the mode, parameters such as the mass equivalent total bending moment, the neutral plane of the stand column and the geometric position and structure of the cargo carrying table are determined, and then the static deflection of the stand column is subjected to structural parameterization analysis and calculation through the deflection curve equation, so that a rapid and effective calculation scheme is provided for the static deflection of the stand column; and the workload of measuring the deflection of the stand column is also saved.

The application provides a vibration response calculation method and system of an asymmetric bias stepped beam structure, and belongs to the technical field of vibration reduction and noise reduction. The asymmetric bias stepped beam structure comprises at least two beam sections whose neutral planes are not on the same straight line. The method comprises the following steps: constructing a vibration control equation of each beam section, constructing a continuity condition between two adjacent beam sections by a virtual spring method, and constructing a motion control equation of the asymmetric bias stepped beam structure based on the continuity condition and the vibration control equation; and determining the vibration response of the asymmetric bias stepped beam structure based on the motion control equation. The application achieves the purpose of solving the vibration response of the asymmetric bias stepped beam structure. Moreover, compared with the existing numerical method, the method of solving by the motion control equation has better efficiency and economic benefits.

This invention discloses an attitude control fixture and deployment method for temperature-salinity profile observation. The fixture includes a fixture body, a transversely arranged sensor mounting position, at least two longitudinal cable channels orthogonal to the mounting position and symmetrically arranged about the neutral plane, an array of through-holes (open area ratio 15%–35%) disposed in the connecting section, and a buoyancy adjustment unit for balancing. During assembly, the geometric center line of the cable channel is aligned with the transverse center line of the sensor, with a transverse distance difference Δ ≤ 3 mm; the minimum spatial isolation distance d between the sensor sensitive area and the nearest cable channel is ≥ 25 mm, and a shielding ring and insulating partition can be used to suppress electromagnetic interference. The buoyancy adjustment unit controls the net buoyancy of the system |Fn| within a range not exceeding 5% of the component's wet weight through a sliding float and / or counterweight.

The invention provides a wing deformation reconstruction method based on a flexible plate sensor, and the method comprises the steps: 1, pasting fiber Bragg grating sensors at the symmetrical positions of the upper and lower surfaces of a flexible plate structure, and pasting the flexible plate structure to the upper surface of a wing main beam; 2, under different load working conditions, a load loading experiment is carried out on the surface of the wing structure, and strain values of all FBG measuring points are obtained through FBG sensors; 3, determining the strain of each measuring point of the FBG sensors on the upper and lower surfaces of the flexographic plate, and calculating the position of a neutral surface corresponding to the wing structure; 4, converting the strain value of each measuring point on the lower surface of the flexographic plate into a curvature according to the position of the neutral surface of each measuring point by utilizing a curvature conversion principle; 5, recursively solving vertex coordinates of all the infinitesimal elements based on a curvature coordinate conversion equation, and 6, reconstructing a deformation curve of the wing structure according to the vertex coordinates of all the infinitesimal elements.

To easily measure the bend of a cable in the sea.SOLUTION: A sensor unit according to the present invention includes a base portion formed of a synthetic resin, a first tension member disposed along a longitudinal direction of the base portion inside the base portion, a second tension member disposed parallel to the first tension member inside the base portion, a first tape core wire disposed along the longitudinal direction of the base portion inside the base portion and disposed at a position away from a neutral plane of the base portion, and a first spacer disposed between the first tape core wire and the neutral plane.SELECTED DRAWING: Figure 3

In a structure in which a resin fills in gaps between wiring patterns, the resin is adjusted in advance so as to reduce the influence of stress in the filling resin. The resin that is to fill in gaps between wiring patterns of a circuit board is an embedding resin with a coefficient of linear expansion and a Young's modulus such that, in a stack in which a base substrate, an insulating layer and a resin portion formed of the embedding resin are stacked in this order, stress at an interface of the insulating layer that is in contact with the resin portion is at most 13.0 MPa. This stress is calculated by the formula σ=(P / bh)+(Ey / R), which is based on a 4-layer model using a temperature difference between room temperature and a glass transition temperature of the insulating resin. σ represents stress (MPa), P represents axial force (N), b represents a depth measurement of the insulating layer (mm), h represents a thickness of the insulating layer (mm), E represents the Young's modulus (MPa), y represents distance from a neutral plane (mm) and R represents a radius of curvature (mm).

The present invention provides a three-dimensional curve reconstruction method and a shape-aware drag array detection system. The method includes: arranging multiple sensing units circumferentially around the central axis of a test object, wherein each sensing unit bends as the test object bends, and for each sensing unit, the angle between the radial line corresponding to the sensing unit and the X-axis on each cross section is the same; for each sensing unit on the cross section of the test object, determining the distance from the sensing unit to the bending neutral plane based on the angle between the radial line corresponding to the sensing unit and the X-axis and the angle between the bending direction of the cross section and the X-axis; determining the total curvature vector of the test object based on the strain detected by each sensing unit and the determined distance; determining the torsion and curvature of the test object in the bending tangent direction based on the total curvature vector; determining the unit tangent vector of the test object in the bending tangent direction based on the torsion and curvature; and integrating the unit tangent vector to reconstruct the three-dimensional curve of the test object. The three-dimensional reconstruction method of the present invention is simple, efficient, and highly accurate.

A highly efficient machining method for densely packed hole systems in large conical parts is disclosed. First, the neutral plane projection of each hole in the unfolded state of the steel plate is drawn. Using this projection dimension offset inward by X as the template size, an oxy-fuel cutting template is drawn. Then, the position lines of each hole are marked on the workpiece to be machined. The oxy-fuel cutting template is aligned with each hole position, and the bottom holes of each hole are pre-cut using oxy-fuel cutting equipment. Next, the workpiece is clamped and fixed using a fixing assembly. Rough boring is used to rough-bore each hole in the lower 1 / 3-1 / 2 area of ​​the workpiece. A fine boring tool is then used to machine each hole to the finished size. The fixing assembly is released, and the workpiece is rotated so that its unmachined area is located below the workpiece. After adjustment, the workpiece is aligned using the inner hole at the small end as a reference, and the bottom holes in the remaining 1 / 3-1 / 2 area are machined to the finished size. The workpiece is adjusted again until all holes in all areas are machined. This method is suitable for batch machining of holes on large-angle conical surfaces, providing a reliable theoretical and practical basis for machining this type of part.

The application provides a MEMS structure and a preparation method thereof, and a MEMS piezoelectric microphone. The preparation method comprises the following steps: sequentially depositing a lower electrode layer, a piezoelectric layer and an upper electrode layer on a front surface of a substrate; etching the upper electrode layer and the upper piezoelectric layer from top to bottom to reserve the inner upper electrode layer and the upper piezoelectric layer; and performing deep silicon etching on a back surface of the substrate until the lower electrode layer is reached to form a back cavity of the substrate. The longitudinal section of the piezoelectric layer after etching is in a "convex" shape, the neutral plane of the piezoelectric layer is not coincided with the geometric symmetry plane, the neutral plane is a plane in the piezoelectric layer where the stress and strain are 0, and the geometric symmetry plane is a plane extending along the horizontal direction through the midpoint in the thickness direction of the piezoelectric layer. In the application, the neutral plane is not coincided with the original geometric symmetry plane, the symmetry in the thickness direction is broken, the sensitivity of the structure is greatly improved, the difficulty of adjusting the process parameters to control the residual stress in the structure is reduced, and the accuracy of quantifying the residual stress is improved.

The present disclosure provides a method, device, equipment and medium for obtaining a lattice constant of a wafer; the method can comprise: obtaining a first correction value according to an angle between a normal of a neutral plane of a wafer to be measured and a desired single crystal growth direction; obtaining a second correction value according to X-ray diffraction angles before and after the wafer to be measured is rotated 180° around the center; obtaining a third correction value according to a measurement point position of incident X-rays on the surface of the wafer to be measured and a fitting function; wherein the fitting function is used to describe the relationship between the measurement point position and the system error; obtaining a corrected diffraction angle of the wafer to be measured based on the X-ray diffraction angle of the front surface of the wafer to be measured and the first correction value, the second correction value and the third correction value; and obtaining the lattice constant of the wafer to be measured based on the corrected diffraction angle and the wavelength of the X-rays.

The purpose of the present invention is to obtain a resin that is adjusted in advance so as to reduce the influence of stress generated in the filled resin in a configuration in which a gap between wiring patterns is filled with the resin. Provided is an insert resin which fills gaps between wiring patterns of a circuit board, said insert resin having a linear expansion coefficient and a Young's modulus such that, in a stacked body in which a base substrate, an insulating layer, and a resin part comprising the insert resin are stacked in this order, the Young's modulus of the insert resin is greater than the Young's modulus of the insert resin. The stress at the interface of the insulating layer in contact with the resin part is 13.0 MPa or less when the stress at the interface of the insulating layer in contact with the resin part is calculated by an equation sigma = (P / bh) + (Ey / R) based on a four-layer beam model using the temperature difference from normal temperature to the glass transition temperature of the insulating layer. [wherein sigma: stress (MPa), P: axial force (N), b: depth (mm) of insulating layer, h: thickness (mm) of insulating layer, E: Young's modulus (MPa), y: distance (mm) from neutral plane, and R: radius of curvature (mm)]

This invention discloses a method for inverting the displacement field of a thick-walled solid structure based on virtual plying, relating to the field of displacement monitoring and inversion technology for thick-walled solid structures. The steps include: embedding a geometrically attached and mechanically isolated virtual ply on the outer surface of the thick-walled solid structure; collecting surface strain as virtual ply membrane strain by arranging measuring points on one side of the virtual ply neutral plane; constructing a weighted least squares functional containing a membrane strain fitting term and bending and shear strain regularization terms; performing variational decomposition of the functional to obtain the virtual ply nodal displacements; and mapping the virtual ply translational displacements to the corresponding nodes of the solid structure to achieve displacement field inversion. This invention solves the problem of high-precision displacement inversion of thick-walled solid structures with single-sided point arrangement without interfering with structural stress, improves the numerical stability of the inversion, adapts to solid element models, is applicable to structures such as pressure vessels, and can be used for structural health assessment.