38 results about "Tangential stiffness" patented technology

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 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 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.