25 results about "Thermo elastic" patented technology

The invention provides an isogeometric topology optimization method and device based on thermoelastic metamaterial design, and relates to the field of isogeometric topology optimization. The method comprises the following steps: constructing a multi-material interpolation model corresponding to a thermoelastic metamaterial, and obtaining multiple groups of density distributions corresponding to multiple solid materials and one density distribution corresponding to one solid material in a thermoelastic metamaterial design domain according to the multi-material interpolation model; obtaining a relation interpolation among the multiple groups of density distributions, and obtaining an elastic modulus and a thermal expansion coefficient according to the relation interpolation; calculating an equivalent elastic matrix corresponding to the thermoelastic metamaterial according to the elastic modulus, and calculating a thermal expansion coefficient matrix corresponding to the thermoelastic metamaterial according to the thermal expansion coefficient; performing discretization form processing on the calculation equations of the equivalent elastic matrix and the thermal expansion coefficient matrix through an isogeometric grid, constructing a constraint function according to the equivalent elastic matrix, constructing a target function according to the thermal expansion coefficient matrix, and calculating sensitivity information corresponding to the first design variable through the target function and the constraint function; updating the first design variable according to the sensitivity information until the thermal expansion coefficient meets a convergence condition, and acquiring a second design variable meeting the convergence condition through geometric topology design models such as a negative thermal expansion metamaterial; and performing optimization design on the thermoelastic metamaterial according to the second design variable. The problem that when a complex geometric structure is processed, a finite element method is difficult to guarantee efficient and high-precision design of the thermoelastic metamaterial is solved.

The invention discloses a thermoelastic topological optimization method for a thermal structure under a thermal stress singular problem, and belongs to the technical field of thermoelastic topological optimization of thermal structures. The method comprises the following steps: firstly, performing finite element modeling and topological optimization on a thermal structure to realize a clear configuration; thirdly, establishing a thermoelastic topological optimization model, and connecting nodes on the original fixed boundary by using a super spring unit to provide weak rigidity constraint; a mechanical displacement component and a thermal displacement component are obtained by superposing the mechanical load equation and the thermal load equation respectively, and a final thermal deformation response is obtained; performing sensitivity analysis according to the thermal deformation response; finally, on the basis of the sensitivity information and a gradient optimization algorithm, carrying out updating iteration on the design variables, and setting a maximum iteration step and a convergence criterion; and deleting the units lower than the threshold after optimization, and retaining the units higher than the threshold to obtain the innovative topological structure after thermal structure optimization. According to the method, the hinge phenomenon, the gray scale problem and the material-free effect of design using fixed boundary conditions can be avoided, and the method is beneficial supplement to an existing thermoelastic topological optimization method.

The application provides an isometric topology optimization method and device based on thermal elastic metamaterial design, and relates to the field of isometric topology optimization. The method comprises the following steps: constructing a multi-material interpolation model corresponding to the thermal elastic metamaterial, and obtaining a plurality of groups of density distributions corresponding to a plurality of solid materials in the thermal elastic metamaterial design domain according to the multi-material interpolation model, one solid material corresponding to one density distribution; obtaining the relationship interpolation between the plurality of groups of density distributions, and obtaining the elastic modulus and the thermal expansion coefficient according to the relationship interpolation; calculating the equivalent elastic matrix corresponding to the thermal elastic metamaterial according to the elastic modulus, and calculating the thermal expansion coefficient matrix corresponding to the thermal elastic metamaterial according to the thermal expansion coefficient; performing discrete form processing on the calculation equations of the equivalent elastic matrix and the thermal expansion coefficient matrix through the isometric grid, constructing a constraint function according to the equivalent elastic matrix, constructing an objective function according to the thermal expansion coefficient matrix, and calculating the sensitivity information corresponding to the first design variable through the objective function and the constraint function; updating the first design variable according to the sensitivity information until the thermal expansion coefficient meets the convergence condition, and obtaining the second design variable when the convergence condition is met through the isometric topology design model of the negative thermal expansion metamaterial; and optimizing the thermal elastic metamaterial according to the second design variable. The application solves the problem that the finite element method is difficult to guarantee the efficient and high-precision design of the thermal elastic metamaterial when dealing with complex geometric structures.

To provide an apparatus for specifying the fatigue strength of fiber-reinforced composite materials that can quickly and highly accurately measure the fatigue strength of fiber-reinforced composite materials.SOLUTION: An apparatus for specifying the fatigue strength of fiber-reinforced composite materials includes: load application means 11 configured to apply a repeated load at a predetermined frequency to a fiber-reinforced composite material being a measurement target such that the stress amplitude changes sequentially every time the number of load repetitions reaches a predetermined frequency; temperature measurement means 12 configured to measure the temperature change of the measurement target in each predetermined period; first calculation means configured to calculate, in each period, the thermoelastic temperature amplitude and average temperature of the measurement target from data of the temperature change of the measurement target; second calculation means configured to calculate, in each period, a non-dimensional thermoelastic temperature amplitude of the measurement target by a predetermined method; and fatigue strength specification means configured to specify the fatigue strength of the fiber-reinforced composite material by the predetermined method using the non-dimensional thermoelastic temperature amplitude in each period.SELECTED DRAWING: Figure 1

The utility model discloses an axial floating type high-pressure ejector pin device, relates to the technical field of high-pressure ejector pin devices, and aims to solve the essential contradiction of rigid topology that a dynamic multi-physical field problem is simplified into a static mechanical model, and a synergistic effect mechanism of stress wave propagation, thermoelastic deformation and turbulence dissipation in a high-pressure system is ignored. According to the key points of the technical scheme, the ejector pin comprises a mounting pin sleeve, an ejector pin body is detachably connected to the interior of the mounting pin sleeve, an ejector pin head is fixedly connected to the upper end of the ejector pin body, a compression spring is fixedly connected to the interior of an insertion groove, and the compression spring is fixedly connected to the interior of the insertion groove. A pressing block is movably connected to the face, away from the inserting groove, of the pressing spring, a positioning pressing block is fixedly connected to the interior of the inserting groove, and a pressing ball and a clamping positioning block are clamped between the positioning pressing block and the ejector pin body. A local stress peak value is reduced to a material safety threshold value through elastic deformation, and fatigue crack initiation is effectively inhibited.

The invention provides an elastic multi-layer structure composite fabric and a preparation method thereof. The elastic multi-layer structure composite fabric comprises a multifunctional integration layer, an elastic supporting layer and a close-fitting cool feeling layer which are sequentially stacked and connected in a composite mode. Wherein the close-fitting cool-feeling layer is one surface in contact with the skin; the multifunctional integrated layer comprises a heat and energy storage layer and a multifunctional composite layer; and the multifunctional composite layer is adhered to the surface of the heat and energy storage layer. According to the scheme, a multi-layer structure fabric compounding mode is adopted, so that the fabric has the functions of cool feeling, antibiosis, ultraviolet prevention, heat storage, elasticity, moisture absorption, breathability, water resistance and self-cleaning, and the compounding performance is stable.

The invention relates to a thermoelastic energy converter system (10) comprising a thermoelastic energy converter (11) with a thermoelastic element (12) as a first component and a chamber wall (15) at least partially enclosing the at least one thermoelastic element (12), wherein the chamber wall (15) defines a chamber (14) as a second component in which the thermoelastic element (12) is arranged.The invention provides that the at least one thermoelastic element (12) is designed as a fluidically tight hollow structure (13) relative to the chamber (14), and that the hollow structure (13) is arranged to penetrate the chamber wall (15) at at least one point, wherein the hollow structure (13) is fluidically tightly enclosed by the chamber wall (15) at this respective point, and one of the two components has two fluidically permeable openings (16) and is thus fluidically permeable, and the other component has at least one opening (17) through which it is coupled to a pressurization device by means of which it can be pressurized with a fluid pressure to deform the thermoelastic element (12). Furthermore, the invention relates to a thermoelastic energy converter (12) for a thermoelastic energy converter system (10).

The invention discloses a maximum horizontal ground stress prediction method based on well wall caving geometry in any shape, and relates to the technical field of well drilling and completion, and the method comprises the steps: constructing a well wall caving geometric model based on well wall logging data; according to the well wall caving geometric model and the rock mechanics experiment data, a well wall strength mechanical model considering the scale effect is established, and the well wall caving rock cohesion strength is obtained; establishing a semi-analytical well periphery coupling temperature-seepage-stress calculation mechanical model by utilizing a well wall caving geometric model to obtain a total stress field; the total stress field comprises an elastic stress field, a pore elastic stress field and a thermal elastic stress field; establishing a well wall caving stable stress intensity criterion; according to the well wall caving geometric model, the well wall caving rock cohesion strength and the total stress field, the well wall caving stable stress strength criterion is used, an inversion model is established, the magnitude and direction of the maximum horizontal ground stress are predicted, and the maximum horizontal ground stress prediction efficiency and accuracy are remarkably improved.

A thermal elastic topology optimization method for thermal structure under thermal stress singular problem belongs to the technical field of thermal elastic topology optimization of thermal structure. First, the finite element modeling of the thermal structure is carried out and topology optimization is carried out, and a clear configuration is realized; then, a thermal elastic topology optimization model is established, and a "super spring unit" is used to connect the nodes on the original fixed boundary to provide weak stiffness constraint; the final thermal deformation response is obtained by superimposing the mechanical displacement component and the thermal displacement component obtained by the mechanical load equation and the thermal load equation respectively; sensitivity analysis is carried out according to the thermal deformation response; finally, the design variables are updated and iterated based on the sensitivity information and the gradient optimization algorithm, and the maximum iteration step and the convergence criterion are set; the units below the threshold value after optimization are deleted, and the units above the threshold value are retained, and the innovative topology structure of the optimized thermal structure is obtained. The present application can avoid the hinge phenomenon, the gray problem and the material effect of the design using the fixed boundary condition, which will be a beneficial supplement to the existing thermal elastic topology optimization method.

A turbine nozzle (112) or blade (114) includes an airfoil body (134) defined by a concave pressure-side outer wall (150) and a convex suction-side outer wall (152) connected along leading and trailing edges (154, 156) and defining a radially extending chamber (160) therebetween. The airfoil body (134) has a smooth inner surface (162) facing the radially extending chamber (160). An impingement cooling structure (170) is located within the radially extending chamber (160). The impingement cooling structure (170) includes: a wall (172) spaced from the inner surface (162) of the airfoil body (134); a plurality of holes (174) defined through the wall (172); and a plurality of elongated thermoflex elements (190) defined in the wall (172).Since the nozzle (112) or the blade (114) is manufactured by additive manufacturing, the airfoil body (134) and the impingement cooling structure (170) include a plurality of integrated material layers.

The invention belongs to the technical field of deep ground environment mechanical testing, and discloses a device and method for simulating a deep ground high temperature-three-dimensional ground stress coupling environment through a prestressed steel strand. The device comprises a test piece main body system, a prestress applying system, a positioning reinforcing system and a monitoring feedback system. The core of the method is that based on a thermal stress formula under three-dimensional complete constraint in thermoelastic mechanics, additional thermal stress caused by ground temperature rise is calculated, and the additional thermal stress and target three-dimensional ground stress are superposed; and through a post-tensioning pre-stress technology, the superposed total stress is accurately and stably applied to an internal test piece for a long time by utilizing a retard-bonded pre-stress steel strand system and a high-strength concrete transfer medium, so that a deep high-ground-temperature and high-ground-stress coupled mechanical environment is constructed. The problems that a traditional coupling test device is high in cost, difficult to control and difficult to stabilize for a long time are solved, and accurate simulation of the deep ground high temperature-three-dimensional stress coupling environment is achieved.

The invention belongs to the technical field of oil reservoir well testing analysis, and discloses a formation pressure and temperature simulation method based on thermoelastic stress sensibility and application. According to the method, a porosity model and a permeability model are established based on the thermoelastic stress sensibility, and meanwhile the temperature and pressure influence is taken as the precondition; an unstable seepage equation and a heat transfer equation are established, a seepage-heat transfer coupling model is obtained and solved by combining the above equations, and real-time simulation of formation pressure and temperature is achieved. The method is applied to inversion, and seepage parameters or thermodynamic parameters of the reservoir can be obtained. According to the method, the thermoelastic stress sensitivity is fully considered into the seepage flow-heat transfer coupling model, accurate simulation of the pressure distribution condition and the temperature distribution condition of the stratum is achieved, the real-time change rule of the porosity and the permeability of the stratum is reflected, and the method is suitable for forward modeling or inversion analysis of reservoir information.

The application provides an elastic multilayer structure composite fabric and a preparation method thereof. The composite fabric comprises a multifunctional integrated layer, an elastic support layer and a close-to-body cool layer which are sequentially and compositely connected. The close-to-body cool layer is the skin-contacting side. The multifunctional integrated layer comprises a heat storage and energy storage layer and a multifunctional composite layer. The multifunctional composite layer is bonded to the surface of the heat storage and energy storage layer. The scheme adopts a multilayer structure fabric composite mode, so that the fabric has the functions of cool feeling, antibiosis, ultraviolet resistance, heat storage, elasticity, moisture absorption and air permeation, waterproof and self-cleaning, and the composite performance is stable.

The invention discloses a multi-material thermoelastic structure topological optimization method and system containing material allowable temperature constraint, and belongs to the technical field of structure topological optimization. Comprising the following steps: 1) acquiring transient heat conduction and transient thermoelasticity static analysis finite element control equations, and performing finite element analysis on a design model; 2) based on a multi-material SIMP method interpolation model and a material domain identification strategy, establishing a material region time domain maximum temperature constraint function and a structure optimization objective function by using a condensation integral function; 3) establishing a multi-material thermoelastic structure topological optimization model containing material allowable temperature constraint; and 4) carrying out iterative updating on the design variables in the topological optimization model by adopting an MMA algorithm to complete the optimization design of the multi-material thermoelastic structure of the design target. According to the method provided by the invention, the maximum temperature of different material areas can be reflected in real time, and the maximum temperature of each material can be controlled within an allowable range in the topological optimization of the multi-material thermoelastic structure under the transient thermal load.

The invention relates to a thermoelastic actuator (1) for providing a rotary actuating motion, comprising:an actuating element (4) for outputting the rotatory actuating motion;an antagonistic actuator unit (2) coupled with the actuating element (4) to convert a translational movement into the rotary actuating motion;wherein the antagonistic actuator unit (2) comprises:at least two electrically separately activatable thermoelastic actuator elements (21, 21a, 21b), each extending in an extension direction (R) from a first end to a second end and arranged parallel to each other;a carriage element (24), which is movably guided in the direction (R), where the thermoelastic actuator elements (21, 21a, 21b) are each connected at the second end to the carriage element (24), so that upon a change of shape upon activation of one of the actuator elements (21, 21a, 21b), a pulling force is exerted on the carriage element (24) to translationally move the carriage element (24);an electrical connection between the first ends of the actuator elements (21, 21a, 21b) connected to the carriage element (24), so that a common electrical potential is applied to the actuator elements (21, 21a, 21b) via the carriage element (24).

The invention relates to a thermoelastic analysis method for a laminated hollow column containing a weak interface, which comprises the following steps: establishing a fractional order heat conduction equation considering an interface effect for a laminated hollow column structure containing the weak interface, and establishing a motion equation, a constitutive equation and a boundary condition which do not consider physical power; performing dimensionless processing on the fractional order heat conduction equation, the motion equation, the constitutive equation and the boundary condition to obtain a control equation; performing Laplace transformation on the obtained control equation, and solving to obtain a mechanical property distribution result; the boundary condition establishing process specifically comprises the step of considering interlayer displacement continuity, heat flow density normal component continuity and temperature discontinuity. Compared with the prior art, by introducing establishment of the weak interface and the fractional order heat conduction equation and Laplacian transformation solution of the control equation, the accuracy of the solution result of the mechanical property distribution rule of the laminated hollow column containing the weak interface can be improved, and the model is more practical.

The invention relates to a thermoelastic energy converter system (10) comprising at least one thermoelastic energy converter (11) with at least one thermoelastic element (12) and with at least two fluidically permeable chambers (14) separated from each other by a respective floor (13) and directly adjacent to each other, in which the at least one thermoelastic element (12) is at least partially arranged and at least partially enclosed by its respective chamber wall (15), wherein each chamber wall (15) has at least two fluidically permeable openings (21).The invention provides that at least one opening (16) of each chamber is connected to at least one opening (16) of a chamber (14) directly adjacent to this chamber (14) via a fluidic connection (17) arranged outside the chambers (14), wherein the at least one thermoelastic element (12) is arranged to penetrate the floor (13) and is fluidically enclosed by it. Furthermore, the invention relates to a thermoelastic energy converter (11) for such an energy converter system (10).

A kind of method for measuring the heat of rod by S type tension and compression force sensor, prepare a fixed support (1), the left end of fixed support (1) is fixed with left baffle (2), the middle part of left baffle (2) is fixedly connected with the left end of S type tension and compression force sensor (3), S type tension and compression force sensor (3) is arranged along the left-right horizontal direction, clamp (4) is installed on fixed support (1) and located at the left side of S type tension and compression force sensor (3), clamp (4) can clamp and fix a thermal elastic rod (5) along the left-right horizontal direction, thermal elastic rod (5) is cylindrical rod;Prepare the thermal elastic rod (5) that needs to measure the heat value, record the length, diameter, the kind of material of the thermal elastic rod (5).Its purpose is to provide a kind of method for measuring the heat of rod by S type tension and compression force sensor, which can deepen the understanding of thermal motion, deepen the understanding of thermal force work, and then improve the utilization efficiency of various heat engines to external work.

The present invention relates to a seat cushion (1) for a sliding seat of a rowing boat or rowing ergometer, comprising a planar cushion (10) with a top (10.1) and a bottom (10.2) and with several planar layers (100, 101) arranged one above the other, wherein at least two layers (100, 101) have different degrees of hardness and / or flexural stiffness, wherein at least one lower layer (101) arranged below an upper layer (100) has a higher degree of hardness and / or a higher flexural stiffness than the upper layer (100).The seat cushion (1) according to the invention is characterized in that the at least one lower layer (101) contains or is formed from a thermoelastic foam which can be deformed by heating and retains its shape created by the deformation after cooling, and the lower layer (101) is at least partially narrower than the upper layer (100).

The present invention discloses an analysis method and system for the thermoelastic instability characteristics of friction pairs of heavy vehicle automatic transmissions, which are applied to the technical field of automatic transmissions. The method includes the following steps: Based on the theory of thermoelasticity, considering the thickness of the center plate and friction material constituting the friction plate as well as the thickness of the mating steel plate, a structural thermoelastic coupling model is established; the boundary conditions of heat flux density, temperature field and stress field during the sliding friction process of the friction pair are set; based on the symmetric and anti-symmetric thermoelastic deformation modes, system matrices under four modes are constructed; the critical speeds corresponding to each mode are solved, and the main mode of the system is determined by comparison; the influence of the structural parameters and material properties of the friction pair on thermoelastic stability is analyzed. The present invention comprehensively considers the thickness of multi-layer material friction plates and various thermoelastic deformation modes, and for the friction pairs of heavy vehicle automatic transmissions, a thermoelastic instability system matrix under four deformation modes is established to determine the main mode and critical conditions of the system.

The present invention belongs to the technical field of civil engineering and topology optimization, and particularly relates to a thermo-elastic topology optimization method for multi-material with different tensile and compressive moduli, comprising the following steps: Step 1: Establish a constitutive relation model of bi-modulus thermo-elasticity; Step 2: Apply the derivation of the self-consistent shear modulus to give the complete elastic matrix and numerical analysis of the thermo-elasticity problem of materials with different tensile and compressive moduli; Step 3: Construct a multi-material thermo-elastic optimization framework based on the moving deformable component method, and realize the structural configuration optimization through the update of geometric information. The present invention simplifies the geometric identification and post-processing of tension rods and compression rods. Since components are used as the structural elements and the same component represents the same material with different moduli, the positions of the compression rods and the tension rods can be directly selected and the tension-compression rod structure can be extracted, and the extraction difficulty of the post-processing can be greatly reduced compared with the existing methods.

The invention discloses a metal plate aerodynamic thermoelastic multi-physical field coupling instability calculation method considering corrosion defects. The method comprises the following steps that 1, corrosion is equivalent to change distribution of material elasticity modulus and density characteristics in the thickness direction; 2, deducing kinetic equations of thermal buckling and thermal flutter of the metal corrosion plate by adopting a Lagrange equation; 3, the flutter speed and the thermal buckling temperature are solved according to the kinetic equation; and 4, comparing and evaluating the flutter speed and the thermal buckling temperature which are obtained by solving with standard values. According to the method, stability parameters such as the thermal buckling critical temperature and the flutter critical speed can be solved synchronously, and the influence rule of the multi-field coupling effect is quantified.

The invention relates to a thermoelastic analysis method for a hollow drum structure, which comprises the following steps: S1, establishing a fractional order heat conduction equation considering a viscoelastic effect for the hollow drum structure, and establishing a motion equation and a constitutive equation not considering physical strength; s2, determining boundary conditions of the hollow drum structure under the thermal shock action; s3, performing dimensionless processing on the fractional order heat conduction equation, the motion equation, the constitutive equation and the boundary condition to obtain a control equation; and S4, carrying out Laplace inverse transformation on the obtained control equation, solving through a characteristic value method to obtain a mechanical property distribution result, and giving a corresponding distribution rule diagram. Compared with the prior art, the method is more suitable for actual working conditions. The calculation precision is improved due to the influence of structural rotation on a mechanical property distribution rule; an efficient solving method is provided, and numerical stability is ensured; the method has the advantages of wide applicability and the like.

The invention discloses a grain homogenization regulation and control method for a non-oriented silicon steel efficient annealing process, which comprises the following steps: constructing a temperature field-gas field-stress field coupling model, and dynamically controlling the annealing process through a Fourier heat conduction equation and a thermoelastic stress equation sigma = E epsilon + beta delta T; the temperature of a preheating section is 700-750 DEG C, the temperature of a soaking section is dynamically adjusted to be Tp, and the jet cooling rate of a cooling section is 60-150 DEG C / s; gradient protective atmosphere is introduced, and the H concentration of the roll head / roll tail area is 5% higher than that of the middle area; the unit tension is 0.15-0.5 * yield strength, and the furnace roller speed gradient and the strip steel thermal expansion rate are matched. By constructing a multi-field coupling model and adopting a partition temperature control strategy, a gradient protective atmosphere, stress field regulation and control and other means, the dual requirements of grain size uniformity and texture optimization are met, and the method has the advantages that the grain size uniformity is improved, the texture proportion is optimized, and the magnetic performance of the material is stabilized.

An intelligent anti-icing material and a preparation method and use thereof are disclosed. The intelligent anti-icing material includes a hydrophobic resin and a nickel-titanium alloy wire embedded in the hydrophobic resin. When the surrounding temperature decreases, the hydrophobic resin in the intelligent anti-icing material shrinks, and the nickel-titanium alloy wire featured by thermoelastic martensitic transformation undergoes phase transformation and expands, which changes the direction of the expansion force inside the ice layer, and thus tiny cracks occur at the interface between the ice layer and the surface of the material, thereby reducing the adhesion of the ice layer to the surface of the material, accelerating the spontaneous shedding of the ice layer, without heating, and achieving an excellent anti-icing effect.