144results about How to "Robust Design Method" patented technology

The invention relates to a method for designing gaps of end straight sections of diagonal few-leaf main springs and auxiliary springs, and belongs to the technical field of suspension steel plate springs. The method includes determining endpoint deformation coefficients of the various main springs and deformation coefficients G<x-CD> of contact points of the end straight sections of the N main springs and the auxiliary springs according to structure sizes and elastic modulus of the various diagonal variable-section main springs; acquiring endpoint force F<N> of the N main springs according to acting load of the auxiliary springs and the endpoint deformation coefficients of the various main springs; designing the main and auxiliary spring gaps between contact points of the end straight sections of the main springs and the auxiliary springs according to the thicknesses h<2> of roots of the N main springs, the endpoint force F<N> and the deformation coefficients G<x-CD>. The method has the advantages that as known from simulation verification, design values of the gaps of the end straight sections of the diagonal few-leaf variable-section main springs and the auxiliary springs can be accurately and reliably obtained by the aid of the method, and accordingly the product design level and performance and the vehicle ride comfort can be improved; the design and experiment costs can be reduced, and the product development speeds can be increased.

The invention relates to a method for designing few-leaf oblique line type variable-section main springs in the gaps between oblique line segments and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the structural sizes and the elasticity moduli of the oblique line type variable-section main springs, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC of the Nth main spring at the contact point of the corresponding oblique line segment and the auxiliary spring are determined first; then, according to the required auxiliary spring acting load design value and the endpoint deformation coefficient Gx-Di of each main spring, endpoint force FN of the Nth main spring is obtained; then, according to the thickness h of the root straight section of the Nth main spring, the Gx-BC and the FN, main spring and auxiliary spring gaps between the oblique line segment of the main springs and the contact point of the auxiliary spring are designed. Through simulation verification, it can be known that the main and auxiliary spring gap design value meeting the auxiliary spring acting load requirement can be obtained by means of the method, and the product design level, product performance and vehicle smoothness are improved. Meanwhile, design and testing cost is reduced, and product development speed is increased.

The invention relates to a design method for few parabolic type variable cross-section main spring end and auxiliary spring gaps, and belongs to the technical field of suspension steel plate springs. The method comprises the steps that according to the structural size and elastic modulus of each parabolic type variable cross-section main spring, an end point deformation coefficient of each main spring and a deformation coefficient Gx-CD of the Nth main spring on the contact point of an auxiliary spring and the end straight section; then, according to the auxiliary spring acting load design requirement value and the end point deformation coefficient of each main spring, the endpoint force FN of the Nth main spring is obtained; then, according to the thickness h2 of the straight section at the root of the Nth main spring, the FN and the Gx-CD, the main and auxiliary gaps between the contact points of the auxiliary springs and the end straight sections of the main springs are designed. According to simulation verification, the accurate and reliable main and auxiliary spring gap design values can be obtained by means of the method, the auxiliary spring acting load design requirement is met, and the product design level and performance and the vehicle ride comfort are improved; meanwhile, the product development speed is increased, and the design and testing expenses are lowered.

The invention relates to a design method for real-time optimal control of nonlinear rigidity of a vehicle air suspension and belongs to the technical field of vehicle air suspensions. The design method is characterized in that according to nonlinear rigidity feature of vehicle air springs and real-time optimal damping ratio of the suspension of a vehicle in a current running state, a relation between the real-time optimal rigidity of the vehicle air suspension and the height is acquired by analytical computation, and the optimal rigidity of the vehicle air suspension is controlled in real time by controlling the height of the air springs. The design method has the advantages that real-time optimal control of the nonlinear rigidity of the vehicle air suspension can be designed reliably and simply, design and test costs can be reduced, vehicle riding performance and riding comfort are improved.

The invention relates to a predicting method of a titanium alloy shot peening strengthening remnant stress field. According to the method, the titanium alloy shot peening strengthening remnant stress field is predicted based on a characteristic parameter and a cosine attenuation function. The method mainly comprises the first step of determining a characteristic parameter model of the shot peening strengthening remnant stress field; the second step of determining a cosine attenuation function model of the shot peening strengthening remnant stress field; the third step of determining controlling factors of the remnant stress field and a shot peening strengthening technological parameter relational model; the fourth step of selecting a technological parameter of the shot peening strengthening and conducting coding; the fifth step of designing a testing scheme and conducting a shot peening strengthening test; the sixth step of testing the remnant stress field; the seventh step of solving the characteristic parameter model of the remnant stress field; the eighth step of solving the controlling factors of the remnant stress field and the like. According to the predicting method of the titanium alloy shot peening strengthening remnant stress field, the technological parameter of the shot peening strengthening is adopted as an input condition, solution is conducted through a model coefficient, and then the depth distribution condition along subsurface of the remnant stress under the technological parameter of the shot peening strengthening can be obtained; the predicting method is simple and reliable, the predicting speed is fast, the accuracy is high, a large number of complicated tests are omitted, difficulties of a finite element method and a physical analytical method are avoided, and the method is applicable to extensive engineering and technical staff.

The invention relates to a design method for stiffness matching and diameter of vehicle suspension stabilizer bars and belongs to the technical field of vehicle suspensions, aiming to fill a gap of the reliable optimal design method for diameter of the stabilizer bars due to limitation of radial deformation analytic analysis and inter-coupling of the stabilizer bars and rubber bushings. The design method is characterized by including the steps of firstly, performing matching design on stiffness of angle of roll of a front suspension stabilizer bar system and a rear suspension stabilizer bar system according to vehicle parameters and roll models; secondly, building an optimal design mathematical model of the stabilizer bar diameter d according to the matching design value of stiffness of the angle of roll, the radial stiffness coefficient Kx of the rubber bushings and the deformation coefficient expression Gw of ends of the stabilizer bars so as to obtain the accurate and reliable optimal design value of the stabilizer bar diameter d by means of a Matlab program. By the design method, design level and performance of the suspensions and the stabilizer bars can be improved, riding comfort and safety of vehicles can be improved, and meanwhile, design speed for product development can be increased and cost for design and test can be reduced.

A planar optical element and a design method thereof. The design method of the planar optical element comprises: designing a group of structures having a determined discrete phase; designing a two-dimensional antenna microarray (13) by using the group of structures having the determined discrete phase as array elements; and a basement (11) and a metal film (12) having a structure of the two-dimensional antenna microarray (13) forming the planar optical element. In the method, the amplitude and phase of a radiation field that has a vertical polarization state and is excited when a beam with a specific wavelength and a polarization state is incident on the planar optical element are modulated by modulating a structure parameter of the antenna array element, thereby shaping the beam as expected, and obtaining a desirable beam shaping result.

The invention relates to a design method for the arc height of an end-non-isomorphic few-leaf root-strengthening-type steel plate spring, belonging to the technical field of suspension steel plate springs. According to the design method, the initial tangent arc height of the end-non-isomorphic few-leaf root-strengthening-type steel plate spring can be designed according to the structure parameters, the elastic modulus, the rated load and a residue tangent arc height design required value under the rated load of each leaf of spring. According to a model machine loading deformation test, the design method for the arc height of the end-non-isomorphic few-leaf root-strengthening-type steel plate spring is correct; an accurate and reliable initial tangent arc height design value can be obtained; and a reliable technical basis is provided for design and CAD software development of the end-non-isomorphic few-leaf root-strengthening-type steel plate spring. By utilizing the method, the product design level, quality and performance and automobile driving smoothness can be improved; meanwhile, product design and testing cost is lowered; and product development is accelerated.

The invention discloses a method for obtaining high temperature alloy efficient low-stress grinding process parameters. The method is characterized by comprising the steps that 1, a high temperature alloy surface integrity grinding process parameter domain and a relation between high temperature alloy surface integrity grinding process parameters and surface integrity features are established; 2, an objective function is established, linear processing is performed, and high temperature alloy grinding process parameter constraint conditions are established; 3, a high temperature alloy efficient low-stress grinding process parameter optimization model is established, and high temperature alloy efficient low-stress grinding process parameters are obtained; and 4, the high temperature alloy efficient low-stress grinding process parameters are verified to obtain final high temperature alloy efficient low-stress grinding process parameters. Through the method, the problems that in the existing high temperature alloy component grinding process, surface residual stress is large, and grinding efficiency is low are solved.

The invention, which belongs to the technical field of the active suspension bracket, relates to a design method of an optimal control force of an LQG controller of an automobile active suspension bracket. On the basis of a one-quarter vehicle driving vibration model, a ride weighting coefficient optimization design simulink simulation model is constructed by using MATLAB / simulink; and optimization designing is carried out to obtain a ride weighting coefficient and an LQG optimal control force by using pavement unevenness displacement as input excitation, tyre dynamic displacement and suspension dynamic deflection as constraint conditions, and root-mean-square value minimization of vertical vibration acceleration of a vehicle body as a design target. According to examples and simulation verification, with the method, an accurate and reliable LQG optimal control force of the active suspension bracket can be obtained; and a reliable optimal control force design method can be provided for the design and control of the active suspension bracket system. Therefore, the design level and product quality of the active suspension bracket system can be improved; the vehicle riding comfort and driving safety are enhanced; and the product design and testing expenses can be reduced.

The invention relates to a design method of a few-leaf parabolic isostress steel plate spring provided with ends of different structures and belongs to the technical field of suspension steel plate springs. The design method comprises the steps that firstly, the root thickness he of equivalent single leaves is determined according to the installation structure, required rigidity design value and the parabolic segment thickness ratio primary value of the steel plate spring, and the maximum permissible thickness [h2] of the few-leaf variable-cross-section steel plate spring is determined according to the permissible stress; and secondly, the number N of the leaves of the few-leaf variable-cross-section steel plate spring, the root thickness of the few-leaf variable-cross-section steel plate spring, and the thickness h1i and length l1i of end straight sections and the few-leaf variable-cross-section steel plate spring are designed according to he and [h2]. It is known through an ANSYS simulation verification, by the adoption of the design method, the parameter design values of the few-leaf parabolic variable-cross-section steel plate spring provided with the end of different structures can be obtained accurately and reliably, the design level and performance of a product can be improved, the quality of the spring is improved, the cost of the spring is reduced, and the vehicle traveling smoothness is improved; and meanwhile, design and testing expenses are reduced, and the development speed of the product is increased.

The invention relates to a collaborative optimization method for a damping coefficient of high-speed rail primary system and secondary system and an end shock absorber, belonging to the technical field of suspension of a high-speed rail vehicle. The method comprises the following steps of: building a twenty-three-degree-of-freedom vibration collaborative optimization simulation mode of the whole high-speed vehicle; taking a track vertical profile irregularity random input, an alignment irregularity random input and a cross-level irregularity random input as input excitation; taking minimum root-mean-square value of vehicle vibration weighted acceleration as a design target; and optimizing the design to obtain the optimal damping coefficient of the high-speed rail primary system and secondary system and the end shock absorber. According to a design example and SIMPACK simulation verification, the accurate and reliable damping coefficient value of the primary system, the secondary system and the end absorber can be acquired through the method, and a reliable design method is provided for the design of the damping coefficient of the primary system, the secondary system and the end absorber. By the method, the design level of a high-speed suspension system and the safety and the stationarity of vehicle running can be improved, the product design and test cost also can be reduced, and the international market competitiveness of the rail vehicle of our country is enhanced.

The invention discloses a design method of an axial symmetry adjustable ultrasonic air inlet way based on a flexible center body. The throat deformation amount under different flight Mach numbers of the axial symmetry adjustable ultrasonic air inlet way is determined, and the flexible center body with a braided fabric reinforcing layer is designed; according to the actual flight Mach number range and the flow needs of the air inlet way, the air inlet way throat control needs under different work Mach numbers are rapidly determined, and the corresponding throat deformation amount of an air inlet way center body under the different work Mach numbers is determined; the flexible center body with a nylon wire reinforcing layer wound in a one-way manner is designed, it is ensured that under the maximum inflation pressure, the flexible layer can deform to the needed diameter, the flexible center body diameter deformation condition corresponding to different inflation pressures is obtained, and through the inflation pressure, the axial symmetry adjustable ultrasonic air inlet way with the adjustable air inlet way throat can be accurately adjusted. Through the method, the effective adjustment of the axial symmetry air inlet way throat is achieved, and on the basis of not losing the low capturing characteristics, the property of the air inlet way is obviously improved.

The invention discloses a design method of a fuzzy logic motion controller of a forklift. The design method comprises the following steps: carrying out kinematical modeling of a forklift; obtaining a relation of error variables and designing optimized data; designing a fuzzy rule base by using a Lyapunov method; and carrying out designing and optimization of a membership function parameter. According to the invention, on the basis of a system stability theory in motion control, stability and stationarity of the controller are guaranteed; optimized design data are obtained based on a forklift ideal motion module; a membership function parameter in a fuzzy logic controller is optimized and designed by using a Newton iteration method. Therefore, the control precision is improved; the field debugging and testing time of the engineering staff is reduced; the efficiency is improved; and the cost is lowered. The design method has advantages of high reliability and practicability and high control precision and adaptability.

The invention relates to a design method for an end-heterogeneous taper slanting leaf spring with variable cross-section, and belongs to the technical field of suspension leaf springs. Based on a mounting structure and rigidity design required values of the leaf spring, root thickness he of the equivalent single slanting leaf spring with variable cross-section is determined firstly, and based on allowable stress, the maximum allowable thickness [h2] of the taper slanting leaf spring with variable cross-section is determined; then, based on he and [h2], piece number N and the root thickness h2 of the taper slanting leaf spring with variable cross-section, and the thickness h1i and the length l1i of a straight section at an end of each piece are designed. It can be known from ANSYS simulation verification that accurate and reliable parameter design values of end-heterogeneous taper slanting leaf spring with variable cross-section can be obtained by utilizing the method, the product design level and performance can be improved, the spring weight and cost can be lowered, and the vehicle running smoothness can be improved; at the same time, the designing and testing expenses are further reduced, and the product developing speed is increased.

The invention provides a device for integration of a real-time and delayed channel of a satellite baseband data processing system. The device comprises a virtual channel logic dispatching unit, a format assembly unit, a filling generation unit, a storage unit and a routing unit. During design, real-time and delayed data transmission is performed for a physical link in a time division manner aiming at a real-time operation mode and a delayed operation mode. The invention further provides a corresponding method for integration of the real-time and delayed channel of the satellite baseband data processing system. By the aid of the method, data transmission efficiency is improved, timeliness of information acquisition in wartime is enhanced, complexity of the system is reduced, and good effect is achieved. The design method is already applied to a specific satellite data transmission subsystem.

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 discloses an acquiring method of antifatigue grinding process parameter domains of a high temperature alloy component. The method comprises the following steps that firstly, the grinding process parameter domain C1 of the high temperature alloy component is established, and a single factor experiment is conducted according to the C1, and the grinding process parameter domain C2 of the high temperature alloy component is obtained through the single factor experiment; secondly, an orthogonal experiment is conducted according to the C2 obtained in the step one, and a relational expression between grinding process parameter and the component surface integrity characteristic is established; thirdly, a fatigue component experiment is conducted according to the C2 obtained in the step one, and a relational expression between the component surface integrity and the fatigue life is established; and fourthly, the antifatigue grinding process parameter domain C3 of the high temperature alloy component is obtained according to the relational expression between the grinding process parameter and the component surface integrity characteristic obtained in the step two and the relational expression between the component surface integrity and the fatigue life. According to the method, by establishing relation between the grinding process parameter and the surface integrity characteristic and the relation between the surface integrity characteristic and the fatigue life, the antifatigue grinding process parameter domains are obtained.

The invention discloses a design method for length of a non-end-contact type less-leaf parabola variable-section auxiliary spring, and belongs to the technical field of suspension steel plate springs. The design method comprises the following steps: establishing a design mathematical model for one half length LA of the auxiliary spring according to composite rigidity design requirement values of primary and auxiliary springs, structure parameters of each main spring leaf, elastic modulus, number of auxiliary spring leafs, thickness of a root straight section of the auxiliary spring, and a thickness ratio of a parabola section of the auxiliary spring; and designing the length of the non-end-contact type less-leaf parabola variable-section auxiliary spring. According to a design example and ANSYS simulation verification, the method can obtain an accurate and reliable length design value of the non-end-contact type less-leaf parabola variable-section auxiliary spring, so that reliable technical basis is provided for designing non-end-contact type less-leaf parabola variable-section primary and auxiliary springs and developing a CAD software; and the method can be utilized for improving product design level, product quality and performance as well as vehicle travelling smoothness; and meanwhile, the design and test cost further can be reduced, and the product development speed is quickened.

The invention relates to a design method of a few-leaf variable-section plate spring based on vehicle parameters, and belongs to the technical field of suspension plate springs. The design method comprises the following steps: firstly determining the clamping rigidity required by the suspension and the root thickness he of an equivalent leaf of the few-leaf parabolic variable-section plate spring according to the vehicle parameters, the natural frequency of the suspension and an installation structure and a parabolic segment thickness ratio of the plate spring, and determining the root maximally allowable thickness [h2] according to the allowable stress and on-spring mass of a single-wheel suspension; then designing the number of the leaves N and the root thickness h2 according to he and [h2]; and finally, optimally designing the inclined segment length and the thickness and length of the end straight segment of each leaf according to the clamping rigidity requirement value and the inclined segment thickness ratio gamma. Through simulation verification, the parameter design value of the few-leaf variable-section spring meeting the vehicle requirement can be obtained by the method, so that the product design level and performance as well as the vehicle ride comfort are improved; and meanwhile, the design and test cost is lowered.

The invention relates to a design method for the damping coefficient of a vehicle body end transverse damper of a high-speed rail vehicle, and belongs to the technical field of suspension of high-speed rail vehicles. As a seventeen-freedom-degree transverse vibration optimization design simulation model of the whole rail vehicle is set up, and irregularity in the railway direction and horizontal irregularity serve as input excitation, with the minimum root-mean-square value of vibration acceleration of vehicle body side roll motion as the design target, the optimal damping coefficient of the vehicle body end transverse damper is obtained through optimization design. It can be known through design examples and SIMPACK simulation verification that the damping coefficient value of the vehicle body end transverse damper can be obtained accurately and reliably through the method, and a reliable design method is provided for designing the damping coefficient of the vehicle body end transverse damper of the high-speed rail vehicle. By means of the method, the design level of a high-speed rail vehicle suspension system can be improved, traveling safety and stability of the vehicle are improved, product design and test cost can be reduced, and the international market competitiveness of the rail vehicles in China is enhanced.

The invention relates to an auxiliary spring rigidity design method for non-end-contact type few-leaf parabolic type main and auxiliary springs and belongs to the technical field of suspension steel plate springs. Auxiliary spring rigidity can be precisely analyzed and designed according to structural parameters of all main springs of the non-end-contact type few-leaf parabolic type main and auxiliary springs, the length of the auxiliary spring, elasticity modulus and auxiliary spring rigidity design required values of the main and auxiliary springs. It is verified that the auxiliary spring rigidity design method for the non-end-contact type few-leaf parabolic type main and auxiliary springs is correct, and a reliable design method is provided for auxiliary rigidity design of the non-end-contact type few-leaf parabolic type main and auxiliary springs. By means of the method, accurate and reliable auxiliary spring rigidity design values of the non-end-contact type few-leaf parabolic type main and auxiliary springs can be obtained, and accordingly the design level and performance of products and vehicle ride comfort can be improved. Meanwhile, product design and test cost is reduced, and development speed is increased.

The invention discloses a method for designing the root thickness of a non-end-contact type taper-leaf end reinforced auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the structural parameters of each main spring, the lengthes and the number of pieces of the auxiliary springs, the thickness ratios of parabolic and oblique segments of the auxiliary springs, the elastic modulus and the design requirement values of composite rigidities of the main-and-auxiliary springs, the invention can design the thickness of the root of the non-end-contact type taper-leaf end reinforced auxiliary spring with the variable cross-section. Through examples and ANSYS simulation verifications, it can be seen that the method can obtain accurate and reliable design values of the thicknesses of root parts of the auxiliary springs, which provides a reliable design method for the thickness of the root of the auxiliary spring of the main-and-auxiliary spring type, and establishes a reliable technical foundation for CAD software development. The method can improve the design level of the vehicle suspension taper-leaf main-and-auxiliary springs with variable cross sections, improve the product quality, improve the vehicle ride comfort, reduce the weights and cosst of the suspension springs, reduce design and test costs and accelerate the speed of product development, simultaneously.

The invention relates to a method of designing the gap between the end of a root-reinforced few-leaf variable-section main spring and an auxiliary spring, and belongs to the technical field of suspension leaf springs. First, the endpoint deformation coefficient of each leaf of main spring and the deformation coefficient G(x-DE) of the contact point between the end straight section of an Nth leaf and an auxiliary spring are determined according to the structure size and elastic modulus of each leaf of root-reinforced variable-section main spring; then, the endpoint force F(N) of the Nth leaf of main spring is obtained according to the auxiliary spring working load and the deformation coefficient of the endpoint of each leaf of main spring; and next, the main-auxiliary spring gap between the end straight section of the main spring and the contact of the auxiliary spring is designed according to the root thickness h2 of the Nth leaf of main spring, F(N) and G(x-DE). Simulation verification shows that an accurate main-auxiliary spring gap value can be designed using the method, the design requirements of the auxiliary spring working load are met, and the product design level and performance and the vehicle riding comfort are improved. Moreover, product development is speeded up, and the design and test costs are reduced.

The invention relates to a design method of a gap between few leaf taper main spring in a parabolic segment and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the method, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC in a contact point between a main spring N and the auxiliary spring can be determined firstly according to the structure size and elasticity modulus of a non-isosteric parabola tapered section main spring at the end part of each leaf; the endpoint force of the main spring N is obtained according to the active load of the auxiliary spring and the Gx-Di of each main spring; then the gap between the main spring in the parabolic segment and the auxiliary spring at the contact point is designed according to the thickness h2 of the root of the main spring N, an FN and the Gx-BC. Simulation verification shows that an accurate design value of the gap between the main spring and the auxiliary spring can be obtained through the method, the design requirement of the active load of the auxiliary spring is met, and the design level and performance of a product and vehicle riding comfort are improved; meanwhile, the development speed of the product is improved, and design and testing costs are reduced.

The invention discloses a two-dimensional profile stretch bending chuck motion track design method for finite element simulation. In order to solve the problem of determination of displacement boundary conditions in the sectional material stretch bending forming finite element simulation process, the method comprises the following steps: establishing a chuck motion track calculation method based on an end face centroid coupling control point, combining the chuck motion track calculation method in the bending process with a finite element simulation displacement boundary condition definition method, and obtaining the chuck motion track in the finite element simulation process according to different pre-tensioning amounts and strain neutral layer inward shifting amounts. According to the invention, the defects in the design of the motion trail of the traditional equal-curvature two-dimensional profile stretch bending chuck are overcome; the method adapts to the stretch bending parametersof three aspects of pre-stretching amount, neutral layer inward movement amount and complementary stretching amount in the stretch bending process, the stretch bending chuck movement track can be quickly calculated, the finite element simulation stretch bending chuck movement track boundary condition definition is smoothly completed, and the simulation result shows that the chuck movement track design method is accurate and reliable.

The invention discloses a method for designing the length of a straight section at the end of a high-speed rail driving motor hanging plate spring, and belongs to the technical field of high-speed rail driving motor hanging plate springs. The method design the length of the end straight section, the length of the parabola section and the thickness of the parabola section at different positions ofthe high-speed rail driving motor hanging plate spring according to the acting length of the hanging plate spring of the high-speed rail driving motor, the thickness and the length of the root straight section, the thickness of the end straight section, the elasticity modulus and the transverse rigidity of the end straight section, under the condition that the cross section shape of the high-speedrail driving motor hanging plate spring and the coordinate origin offset of the parabola section are considered. Known from prototype test, the method for designing the length of the straight sectionat the end of the high-speed rail driving motor hanging plate spring is correct, and the accurate and reliable length of the straight section at the end, the length of the parabola section and the design value of the thickness of the parabola section at different positions can be obtained, it is guaranteed that the transverse rigidity meets the design requirement, and the product design level andreliability are improved.

The invention relates to a method for designing a gap between a root-strengthened type few-leaf main spring and an auxiliary spring on a parabolic segment, and belongs to the technical field of suspension steel plate springs.The method comprises the steps that endpoint deformation coefficients of all main spring leaves, and a deformation coefficient G[x-CD] of the N main spring leaf at the contact point of the N main spring leaf and the auxiliary spring on the parabolic segment can be determined according to the structure size and elastic modulus of the root-strengthened type few-leaf variable cross-section main spring; endpoint force F<N> of the N main spring leaf is obtained according to a design requirement value of a working load of the auxiliary spring and the endpoint deformation coefficients of all the main spring leaves; the main spring and auxiliary spring gap between the main spring and the auxiliary spring on the parabolic segment is designed according to the straight section thickness of the N main spring leaf, the F<N> and the G[x-CD].It can be known through simulation verification that by means of the method, a design value of the gap between the main spring and the auxiliary spring of a root-strengthened type few-leaf variable cross-section main spring can be obtained accurately and reliably, the design requirement of the working load of the auxiliary spring is met, and the product design level and performance and vehicle smoothness are improved; meanwhile, the design expense and testing expense are reduced, and the product development speed is increased.

The invention discloses a method for obtaining high-efficiency low-stress grinding process parameters of ultra-high-strength steel. The method comprises the following steps of: step 1, establishing a surface integrity grinding process parameter domain of the ultra-high-strength steel, performing an orthogonal test, and establishing a relational expression of surface integrity grinding process parameters of the ultra-high-strength steel and surface integrity characteristics through the orthogonal test; step 2, establishing an objective function, performing linear treatment, and establishing constraint conditions for the relational expression of the grinding process parameter domain and the characteristics, which are established in the step 1; step 3, establishing a surface integrity high-efficiency low-stress grinding process parameter optimization model of the ultra-high-strength steel according to the objective function and the constraint conditions, which are established in the step 2, and performing solving to obtain the high-efficiency low-stress grinding process parameters of the ultra-high-strength steel; and step 4, verifying the grinding process parameters obtained in the step 3 to obtain the final high-efficiency low-stress grinding process parameters of the ultra-high-strength steel. Through the adoption of the method disclosed by the invention, during grinding of a ultra-high-strength steel component, residual stress on surfaces is small, and grinding efficiency is high.

The invention relates to a method for designing clearances between the parabolic segments of end reinforced type few-leaf main springs and auxiliary springs, and belongs to the technical field of suspension steel plate springs.The method comprises the steps that the end deformation coefficient Gx-Ei of each main spring and the deformation coefficient Gx-BC of the contact point of the parabolic segment of the Nth main spring and the corresponding auxiliary spring can be firstly determined according to the structural size and elastic modulus of each end reinforced type variable cross-section main spring; then, the end force FN of the Nth main spring is obtained according to the design requirement value of the acting loads of the auxiliary springs and Gx-Ei; then, the main and auxiliary clearances between the parabolic segments and the contact points of the end reinforced type few-leaf main springs and the auxiliary springs are designed according to the thickness h2 of the root straight segment of the Nth main spring, Gx-BC and FN.It can be known through emulation verification that the accurate and reliable main and auxiliary spring clearance design value can be obtained through the method, and therefore the product design level and performance and car smoothness are improved; meanwhile, design and experiment cost is reduced, and the product development speed is increased.