38 results about "Tangential stiffness" patented technology

Disclosed is a method of detecting interfacial configuration of a multilayer adhesive structure. On the basis of a control equation of wave propagation, mechanical characteristics of an adhesive interface are represented via nominal and tangential rigidity coefficients so as to deduce an expression of reflection and transmission coefficients of longitudinal and transverse waves in the multilayer adhesive structure at the time of incoming of the ultrasonic longitudinal wave; taking an aluminum-epoxy resin-aluminum adhesive structure as an example, when incoming frequency f of the longitudinal wave and thickness h of an adhesive layer are of certain fixed values, the relation of the incoming angle to the reflection and transmission characteristics of the longitudinal and transverse waves in different interfacial configurations is analyzed; similarly, under the condition of the incoming angles 0 DEG and 30 DEG of the longitudinal wave, the influence of a frequency-thickness product upon reflection and transmission characteristics of the acoustical wave is discussed; meanwhile, which manner is taken to identify the interfacial configuration is explained. Compared with other detection methods, the method which is simple, effective and practicable is suitable for identifying the interfacial configurations of the adhesive structures.

The invention aims to provide a design method of a steering system dynamic vibration absorber with simple structure, low cost and convenient installation so as to solve the problem of steering wheel vibration when idling and improve vehicle riding comfort. The steering system dynamic vibration absorber comprises a plate like mounting base and a mass block which are connected by a plurality of rubber columns; by adjusting the mass of the mass block and the rubber column tangential stiffness, the tangential inherent frequency of the dynamic vibration absorber when the dynamic vibration absorber is installed in a steering system is similar to the main exciting frequency when the motor idles; the vibration of the motor when the vehicle idles is transmitted to the dynamic vibration absorber via a steering column or the steering wheel to cause the mass block to carry out sympathetic vibration and convert into heat quantity to be dissipated, thus greatly lowering vibration transmitted to the steering wheel and improving vehicle riding comfort. The absorber has small improvement of the original vehicle, has simple structure, low cost and convenient installation and is suitable for being applied to produced or designed and shaped vehicle types.

The invention discloses an automobile shock absorber and belongs to the field of automobiles. The automobile shock absorber is arranged inside an automobile steering wheel and comprises a mass block and a rubber column under the mass block, wherein the rubber column is used for supporting the mass block; and the mass block is fixedly connected with the rubber column, and the tangential inherent frequency of the automobile shock absorber is allowed to be close to the idle-speed vibration frequency of the automobile steering wheel so as to form resonance. The automobile shock absorber of the invention effectively utilizes the inner space of the steering wheel and the tangential stiffness property of rubber and adopts a shock absorbing structure comprising the mass block and the rubber column, so that a small-size and low-frequency power shock absorber is designed and manufactured, the idle-speed vibration problem of the steering wheel is solved, and the first application of shock absorber technology in solving the vibration problem of the idle-speed steering wheel in China is realized. Comparing with the prior art, the automobile shock absorber has the advantages of simple structure, simple and convenient processing and manufacturing, short development period, low cost and convenient popularization.

A rough surface-based three-dimensional contact stiffness calculation method for a spur gear. The method comprises: carrying out hexa meshing under the requirement that all square meshes on a tooth surface are equal in area; calculating contact pressure distribution of a smooth tooth surface on the basis of a finite element method, and extracting the pressure of a node in a contact region; calculating normal contact stiffness and tangential contact stiffness of a single square mesh on the basis of a fractal theory; and calculating the contact stiffness of the tooth surface. The method further improves the precision of a gear contact stiffness calculation model, overcomes the defect of smooth contact based on a Hertz theory in a previous calculation process, and reveals the influence rule of a roughness parameter on a stiffness characteristic of a gear in the process of contact of rough tooth surfaces and a calculation method. Moreover, the finite element-based three-dimensional contact stiffness calculation model is more accurate than a previous two-dimensional calculation model or calculation formula. In addition, the influence of errors in actual assembling and manufacturing processes of a gear is considered, so that the contact stiffness of the gear is more accurate, and a foundation is laid for dynamics analysis of the gear.

The invention discloses a device for testing a tangential stiffness property of a joint surface, and belongs to the fields of mechanical design and manufacture. The device consists of a test loading device (1) and a tangential test assembly. An upper test piece (7) is butted with a lower test piece (6), and a gap is reserved at the joint; a pressing plate (3) and a pressing plate (11) are arranged on two surfaces vertical to the test piece butting surface, and are fixedly connected through two high-strength bolts (9) and (11) to form the tangential test assembly; the high-strength bolts (9) and (11) are symmetrical about the gap of the joint of the upper and lower test pieces; brackets (8) and (5) are arranged on two sides of the gap of the joint for accommodating an eddy current displacement sensor (4); and a force sensor (14) for measuring loading force signals and the eddy current displacement sensor (4) for measuring the tangential displacement variation of the joint surface are connected to a signal acquisition system. The device has the advantages of simple machining, convenience for clamping, high universality, high controllability of the parameters and the like.

The invention relates to a large joint surface experiment device, in particular to a large joint surface normal rigidity and tangential rigidity detection device and method. The device comprises a normal augmentor (1) in a mechanical frame, a normal eddy current sensor (2), an upper test specimen (3), an acceleration sensor (4), a tangential augmentor (5), a lower test specimen (6), a working platform (7), a tangential eddy current sensor (8), a tangential force sensor (9) and an upper computer for calculating the characteristics of a joint surface. In the method, a periodical external force load and the deformation of the joint surface under the periodical external force load are measured in a Kelvin-Voight model, a delaying curve of the periodical process is made, and the rigidity and damping characteristics of the joint surface are obtained. The large joint surface normal rigidity and tangential rigidity detection device can be used for measuring static and dynamic normal rigidities and damps of the large fixed joint surface, and can realize the characteristics of the joint surface when loaded with a positive load, an unbalance load and an impact load.

The invention discloses a method and system for measuring the characteristic scale of the junction part of a split TBM cutterhead, wherein the method includes: modeling to obtain the original cutterhead model; simplifying the original cutterhead model to establish a simplified model of the cutterhead in scale, and Establish the overall static stiffness model of the scale split TBM cutter head; obtain the fractal dimension and fractal roughness of the joint according to the structure function method; obtain the theoretical normal stiffness of the joint according to the fractal dimension and fractal roughness, and pass the theoretical Calculate the theoretical tangential stiffness of the joint, and then calculate the Poisson's ratio; measure the experimental tangential stiffness and test shear modulus of the joint through the test, and correct the elastic modulus and normal stiffness; through the scaled split TBM knife The overall static stiffness model of the disc is fitted and the error is evaluated, and the characteristic parameters of the joint part of the original cutter disc are inverted. The method is easy to operate, accurate in measurement, and strong in adaptability, and can realize the test of joint surface characteristics of split TBM cutterheads with different structures, and the measurement cost is low.

The invention relates to a device and a method for testing tangential rigidity of a junction surface of a wheel disc. The device comprises a universal testing machine, a pull rod rotor, a digital dial gauge I, a digital dial gauge II and a computer, wherein a pressure sensor arranged on the universal testing machine is connected with the computer by a data line; the universal testing machine further comprises a rack; an upper press head is arranged on the top of the rack; the digital dial gauge I and the digital dial gauge II are respectively positioned at two sides of the upper press head; a movable cross beam is arranged in the middle of the rack; two support blocks are arranged on the cross beam at an interval; the pull rod rotor is horizontally erected on the two support blocks; the pull rod rotor is positioned just under the upper press head. After the technical scheme is adopted, the technical problem that a device and a method which are used for testing the tangential rigidity of the junction surface of the wheel disc are lacked in the prior art can be solved.

The invention discloses a tangential rigidity measuring device for two crossed parabolic cylinders. The device is composed of a measuring device, a clamping device, an excitation device and a rotating platform. The measuring device plays a role in measuring the force and displacement of a test piece in real time; the clamping device plays a role in fixing the test piece; the excitation device applies an excitation force to the test piece, so that the test piece generates force and displacement; and the rotating platform rotates to change the angle between the two crossed parabolas. The measuring device can detect the real-time tangential rigidity of the two parabolic cylinders, so that the contact characteristics of the parabolic cylinders can be researched conveniently. The device is simple in structure and is easy to operate.