87 results about "Stiffness design" patented technology

The invention relates to a method for designing the stiffness of a helical spring of a combined valve for shock absorbers, which belongs to the field of shock absorbers. The method is characterized by comprising the following steps: (1) according to the radius of the inner circle of a throttling valve sheet of the combined valve for shock absorbers and the radius at the position of a valve port, selecting an intermediate diameter of the helical spring; (2) determining the inside and outside radii of a contact circular ring (acted on the throttling valve sheet) of the helical spring; (3) calculating the deformation coefficient of the throttling valve sheet at the position of the valve port; (4) determining the spring pressure acted on the throttling valve sheet; and (5) determining the stiffness of the helical spring of the combined valve for shock absorbers. According to the invention, as an analytical design method is adopted, the stiffness design value is more accurate and reliable, thereby avoiding the operations of repeated testing and modifying, lowering the design cost of a shock absorber, and improving the development cycle of the shock absorber; and by using the analytical design method, the fast and accurate design requirements of helical springs of combined valves for shock absorbers for automobiles can be satisfied.

The invention discloses a variable-rigidity spherical hinge and a design method. The variable-rigidity spherical hinge comprises a spherical hinge body and an outer sleeve, wherein the outer sleeve sleeves the spherical hinge body; the variable-rigidity spherical hinge and the design method are characterized in that an annular sealing space in the circumferential direction is formed between the spherical hinge body and the outer sleeve, the annular sealing space penetrates into a rubber layer of the spherical hinge body, an annular stopping block is arranged in the annular sealing space, and the annular sealing space is not completely filled with the annular stopping block; and an annular gap which is arranged in the axial direction is formed between the spherical hinge body and the annular stopping block, the minimum radial width of the annular gap is X, and X is larger than 0.5mm and less than 10 mm. According to the variable-rigidity spherical hinge and the design method, the requirements that the required rigidity is small of the spherical hinge under a small load, the required rigidity is obviously increased of the spherical hinge under a large load and the bearing requirements of the time limit can be met; and external dust, soils and even sand particles can be effectively prevented from entering the interior of the spherical hinge, the release space of the rubber is increased, the rubber is effectively prevented from being bent and deformed, the increase of the pre-compression amount of the product is facilitated, the generation of rubber cracks is prevented, and thefatigue life is prolonged.

The invention discloses a method for assessing the reliability of a main shaft of a kilometer deep shaft hoist by considering multiple failure modes. The method comprises the steps of firstly, building a parametric three-dimensional model of the main shaft according to the structure size of the main shaft; secondly, according to a probability attribute of a random variable of the main shaft, establishing a sampling matrix of the random variable, and solving strength and stiffness response of the main shaft under the sampling matrix by using a finite element method; thirdly, establishing an explicit function between the response and the random variable matrix by using a neutral network method, and according to strength and stiffness design criteria, establishing explicit functions in strength and stiffness failure modes; fourthly, calculating two failure probabilities by using a saddle point approximation method; and finally, building a joint failure probability model between the two failure modes through a Clayton copula function, and solving system reliability under joint failure by using an interval reliability method. According to the method, the probability correlation between strength failure and stiffness failure is considered, so that the system reliability of the main shaft of the hoist can be assessed more accurately and reasonably.

The invention relates to a design method for a root thickness of a non-end-contact few-leaf oblique-line type auxiliary spring, and belongs to the technical field of suspension steel plate springs. The design method disclosed by the invention is capable of designing a thickness of a straight section of a root of the non-end-contact few-leaf oblique-line type variable-section auxiliary spring according to the structural parameters and elasticity modulus of each main spring of a non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring, the length of the auxiliary spring, the thickness ratio of the oblique-line segments of the auxiliary spring, and a composite stiffness design requirement value KMAT of the main-auxiliary spring. Through examples and simulation verification, the design method for the root thickness of the non-end-contact few-leaf oblique-line type variable-section auxiliary spring, which is provided by the invention, is correct, an accurate and reliable design value of the root thickness of the auxiliary spring can be obtained, a reliable design method is provided for the root thickness of the auxiliary spring, and the design level, product quality and performance, and vehicle running smoothness of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring are improved by virtue of the method; and meanwhile, design and test expenses can also be reduced, and the development speed of products can be accelerated.

The invention relates to a design method for a stiffness of an auxiliary spring of a non-end-contact few-leaf oblique-line type main-auxiliary spring, and belongs to the technical field of suspension steel plate springs. The design method disclosed by the invention is capable of designing the stiffness of the auxiliary spring of the non-end-contact few-leaf oblique-line type main-auxiliary spring according to the structural parameters and elasticity modulus of each main spring of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring, the length of the auxiliary spring, and a composite stiffness design requirement value of the main-auxiliary spring. Through examples and experimental test, the design method for the stiffness of the auxiliary spring of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring, which is provided by the invention, is correct, an accurate and reliable design value of the stiffness of the auxiliary spring can be obtained, a reliable technical foundation is laid for a design for the auxiliary spring of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring, and the design level, product quality and performance, and vehicle running smoothness of the non-end-contact few-leaf oblique-line type variable-section main-auxiliary spring are improved by virtue of the method; and meanwhile, design and test expenses can also be reduced, and the development speed of products can be accelerated.

A compliant gripper with integrated position and force sensors dedicated to automated micro-assembly tasks. The gripper possesses a larger gripping range with a bidirectional drive, and is capable of detecting grasping force and environmental interaction forces in horizontal and vertical axes. The gripper has a compliant rotary flexure bearing. The gripper further has a compliant mechanism with two-stage stiffness designed to provide force sensing with dual sensitivities in two measuring ranges to accommodate the grasping of objects with different sizes. The dual-sensitivity, dual-range force sensor provides finer and coarser force sensing in a small and large ranges, respectively. Analytical models are derived to predict the grasping range, force sensing sensitivities, and force measuring ranges. These models are verified by conducting finite-element analysis simulations.

The invention provides a dynamic stiffness design method, and relates to the technical field of rail transit vibration damping rail design. The dynamic stiffness design method is suitable for design of the dynamic stiffness of a vibration damping pad of an isolated floating plate rail system. The design method includes the steps that the dynamic stiffness of the vibration damping pad within the preloading load and preset frequency range is tested, according to the dynamic stiffness, the inherent frequency of a floating plate rail of the isolated floating plate rail system is calculated, the construction quality or maintenance quality of the floating plate rail is inspected according to the inherent frequency, and/or the vibration damping effect of the floating plate rail is evaluated. According to the dynamic stiffness design method, quick inspection and scientific evaluation of the construction quality or maintenance quality of the floating plate rail can be achieved, and meanwhile, the real vibration damping effect of the floating plate rail can also be evaluated.

The invention relates to the technical field of bridge rigidity design, and particularly discloses a method for judging the overall rigidity of a railroad bridge. According to the method, the overallrigidity of the bridge is judged through the chord measurement value, the calculation is convenient, rapid review is faciliated, the established sample library can be widely applied to rigidity evaluation of each bridge design stage; differences of influences of various loads on rail deformation under different spans, bridge types and geological conditions do not need to be considered; the methodis simple in operation, saves design time and cost, is particularly suitable for overall rigidity evaluation of large-span bridges which are not involved in existing specifications, effectively avoidsa large amount of dynamic analysis and check calculation work during large-span bridge design and the problems of construction cost rising, later maintenance difficulty and operation safety caused byunreasonable design rigidity, and has an excellent application prospect.

The invention belongs to the field of airplane design and relates to a design method of a cylindrical object flutter model free of an independent counter weight space. The design method is characterized in that a profile-followed counter weight is adopted to conduct cylindrical object flutter model design; the method comprises the steps as follows: firstly, stiffness design: the similarity of the flutter model and a target real object in frequency and mode is more than 95%; secondly, shape design: aerodynamic shapes of the flutter model and the target real object are consistent; thirdly, mass design: the similarity of the flutter model and the target real object in mass, center of mass and rotational inertia is more than 95%, and the profile-followed counter weight replaces the partial design shape. The design method has the benefits as follows: the counter weight space is expanded and the counter weight mass is increased while the original design thought is considered, so that the cylindrical object flutter model free of the independent counter weight space has design feasibility.

Provided is a combined solid wheel for rail vehicles, which is characterized by comprising a wheel vulcanizate vulcanized from an inner metal layer and an outer rubber layer and a flange connecting disk which can be fitted with an axle. The number of the wheel vulcanizates is two and is coaxially aligned, the flange connecting disk is sandwiched between the two wheel vulcanizates and detachably connected with the wheel vulcanizates, the outer diameter of the flange connecting disk is smaller than the outer diameter of the wheel vulcanizates, and the flange connecting disk extends between the rubber layers of the two wheel vulcanizates. As that combine structure provided by the invention is simple and reliable, and is easy to assemble and replace, the non-linear radial stiffness of the wheel in the load-bearing proces can be realized, the ride comfort of the vehicle can be improved, and the stopper limit function can be provided, the radial deformation limit of the wheel can be realized, and the safety and reliability of the vehicle operation can be improved. The invention also provides a stiffness design method of a combined solid wheel for a rail transit vehicle.

The invention relates to a tunnel supporting structure system rigidity design method and system, and the method comprises the steps of dividing surrounding rock deformation into four stages accordingto the relation between a deformation position and a tunnel excavation direction and the relation between the deformation position and a tunnel face, and then respectively calculating the surroundingrock standard deformation quantities of the four stages; preliminarily designing the support structure system rigidity value of each stage according to the surrounding rock standard deformation quantity of the four stages, and finally adjusting the rigidity value of the support structure. The quantitative design of the tunnel supporting structure system is realized by establishing the tunnel mechanical model, formulating the surrounding rock deformation quantitative control standard and establishing the quantitative relationship between the tunnel surrounding rock deformation and the supporting rigidity, and the optimal distribution of the supporting system rigidity is further performed to obtain the most economical rigidity design scheme, so that the supporting design is more scientific and reasonable.

The present invention relates to a design method for a root thickness of an end-contactless few-leaf root-enhanced sub-spring, and belongs to the technical field of suspension leaf springs. According to the method, the thickness of a flat straight section of a sub-spring root of end-contactless few-leaf root-enhanced main and sub springs with a variable cross section can be designed according to a structure parameter of each leaf of main spring, a length and a leaf number of a sub-spring, a thickness ratio of an inclined line segment of the sub-spring and a thickness ratio of a parabolic line segment, an elastic modulus, and a main and sub spring composite stiffness design requirement value. It can be known by instances and simulation verification that the design method for the root thickness of the end-contactless few-leaf root-enhanced sub-spring, which is provided by the present invention, is correct, and an accurate and reliable sub-spring root thickness design value can be obtained, and a reliable design method is provided for design of the end-contactless few-leaf root-enhanced main and sub springs, and by using the method, the design level, product quality and performance of the few-leaf main and sub springs with the variable cross section as well as vehicle driving smoothness can be improved. Moreover, design and experiment costs can be lowered, and product development can be sped up.

The invention discloses a V-shaped rubber stack component. The component comprises a horizontally arranged mounting plate, and two rubber stacks bonded on the mounting plate in a vulcanized manner, wherein each rubber stack comprises a rubber layer, a baffle laminated with the rubber layer, and an outer layer plate arranged in the outmost layer; the rubber layer, the baffle and the outer layer plate are bonded into a whole in a vulcanized manner; the two rubber stacks are symmetrically arranged on the upper and lower layers of the rubber plate and bonded to the middle of the mounting plate; the rubber stack is inclined to the longitudinal direction of a product; the two rubber stacks form V shape distribution with an included angle being alpha; and the angle alpha is greater than 120 degrees and smaller than 180 degrees. The V-shaped rubber stack component is high in vertical and lateral stiffness, low in lateral and longitudinal rotational stiffness, and suitable for the stiffness requirements during suspension and bearing processes, improves the vibration reducing to suspended pieces, is high in vibration reducing reliability, meets the requirements on vibration reducing and moving adaptability of gear cases, motors and engines, saves mounting space, is convenient for mounting and maintenance, and low in cost. The invention further provides a stiffness design method and the application of the V-shaped rubber stack component.

An elastic wheel for a rail traffic vehicle comprises a tire, a wheel core and elastic bodies, wherein the tire and the wheel core are radially separated to form radial clearances and are circumferentially separated to form circumferential clearances; N*2 circumferential clearances are circumferentially uniformly distributed, and N is not less than 3; each elastic body is compressed into the corresponding circumferential clearance; the elastic bodies are radially separated from the tire and the wheel core without contact; and the circumferential clearances are arranged parallel to two sides towhich the elastic bodies are clung. With the adoption of the elastic wheel for the rail traffic vehicle, the radial rigidity of the elastic wheel can be effectively reduced; the radial axis rigidityratio of the elastic wheel is reduced; the vibration condition of a lower part of a vehicle spring is reduced; the structure stability and reliability of the elastic wheel is improved; the rigidity demand of the lower part of the vehicle spring in a low-floor vehicle under different route conditions can be met; the use safety of the elastic wheel is improved; the production cost and the maintenance cost of the elastic wheel are low; and the practicability of the elastic wheel is improved. The invention also supplies an assembling method and a rigidity design method of the elastic wheel for therail traffic vehicle.

The invention discloses a high-protective-property variable-rigidity skiing helmet and a design and preparation method thereof, and belongs to the field of helmets. The method comprises the following steps: firstly, fusing a non-uniform curve reinforcement variable stiffness design technology into helmet design, and establishing a representation mode of a variable stiffness non-uniform curve rib model by utilizing a space variable condensation technology and a grid mapping technology to obtain a geometric model of a shell rib cluster; and parametric modeling of the curve ribs on the complex small-space special-shaped curved surface and collaborative design of the shapes and the layouts of the ribs are realized. Then, all components and proportions of materials used by the shell are determined through experimental testing, and injection molding process parameters are determined through mold flow analysis. And finally, a design scheme of the high-protection variable-stiffness skiing helmet is obtained. According to the method, parametric modeling of the curve ribs on the complex small-space special-shaped curved surface and collaborative design of the shapes and the layouts of the ribs can be realized; structural rigidity can be distributed in different areas according to needs, the design capacity of the helmet is remarkably improved, and the method is expected to be one of the most potential methods in helmet design.

The invention discloses an elastic buffer casing and a rigidity design method of the elastic buffer casing. The elastic buffer casing sequentially comprises a flange part section, a first bearing seat section, a transition section and a second bearing seat section in the axial direction, wherein the flange part section is provided with a flange edge, and the flange edge is fixedly connected with an outer casing through bolts, so that one end of the elastic buffer casing is fixed on the outer casing; an inner hole of the first bearing seat section is matched with an outer circle of a first bearing mounted on a power output shaft assembly; an inner hole of the second bearing seat section is matched with an outer circle of a second bearing mounted on the power output shaft assembly; and the diameter of the transition section is gradually transited from the diameter of the first bearing seat section to the diameter of the second bearing seat section in the axial direction. The action time of impact force is prolonged by reducing the rigidity coefficient of the elastic buffer casing, so that the effect of preventing a power turbine rotor system and the casing from being damaged by vibration impact is achieved, and safe and stable work of a whole aircraft engine is ensured.

The present invention relates to a construction method for a repairing and reinforcing structure of a deteriorated building, capable of improving spatial usability by using mortar having various properties for strength without using concrete as a fill material and of completely preventing reinforcing bars from being corroded. The construction method for a repairing and reinforcing structure of a deteriorated building also enables stiffness design and ductility design. According to the present invention, the repairing and reinforcing structure of the deteriorated building includes: a repairing material formed of the concrete or the mortar filled in a damaged part of a structure; a metal reinforcing casing installed at intervals on the outer side of the structure to enclose the structure; and grout filled between the structure and the reinforcing casing.