German standard VDI2230 bolt joint surface modeling method is what highway guardrail bolt plate guardrail bolt bolt information
olt joint surface is a kind of connection form used in mechanical structure, it has an important influence on the static and dynamic characteristics of stainless steel screw mechanical structure. In the motor frame model, the bolt joint surface exists between the motor end cover and the cylinder, and between the cylinder and the base.
(Wenzhou fasteners – stainless steel screws)
Therefore, this paper takes a typical motor base as the object to study the influence of bolt joint face on motor vibration characteristics and the finite element modeling method of bolt joint face. As a common power device, the noise level of motor has become one of the important indicators to measure quality. In this paper, a 75kW induction motor is taken as the research object, and the vibration and noise level of the motor is predicted by combining ANSYS and SYSNOISE. Specific research work are as follows: (1) through the review of relevant literature, taking a typical motor frame as the research object, the modal testing scheme design system of the motor frame, studied different bolt joint surface parameters (different bolt pre-tightening force and surface roughness over, different surface processing methods, different bolt number) the influence of electric tools and state laws. (2) a variety of bolt joint surface modeling method is adopted to establish the base of finite element model, the simulation calculation of motor frame mode, and compared with experimental results, and puts forward a kind of based on German standard VDI2230 bolt joint surface modeling method, and verifies the method is simple and feasible method of bolt joint surface modeling, finite element analysis to lay the foundation for subsequent motor. (3) Take a 75kW induction motor as the object, use Pro/E to establish the 3d solid model of the motor (including stator, housing, front and rear end covers), and use the proposed bolt joint surface modeling method based on German standard VDI2230 to establish the finite element model of the motor, and conduct modal analysis of the motor. (4) Analyze the air gap flux density distribution of the motor when the rotor slot fit is 60/50, and calculate the radial electromagnetic excitation of the motor stator based on it. The transient response of the motor frame was analyzed, and the vibration response was obtained, which was compared with the experimental results to verify the correctness of the calculated results.
(5) The boundary element model of the motor frame is established by using Hypermesh. The speed data of the surface node of the motor frame in time domain is converted into speed data in frequency domain by writing the ANSYS spectrum analysis program of stainless steel chemical anchor. The radiated noise simulation calculation of the motor is carried out by using SYSNOISE software, and the radiated sound field of the motor is analyzed.
Highway guardrail bolt plate Guardrail bolt bolt information
Guardrail bolt plate and cable guard are all highway protection products, there is no single protective equipment on the highway, guardrail bolt plate splicing bolt model needs to combine the two to better protect the smooth and safety of the highway. Are cable guardrail bolt plates defective? In terms of entering the market, it was unable to compete with many steel plate fence bolt manufacturers
(Wenzhou fasteners – guardrail bolts)
Next, let’s learn about the advantages and disadvantages of high-speed guardrail bolt plate and cable guardrail bolt Protective effect aspects: cable guardrail and fence bolt plate collision avoidance level has its own level of protection: A, B, S, but the cable guardrail bolt protective effect is significantly better than that of guardrail bolt plate, cable guardrail bolt cable is composed of several steel wire rope, wire rope of collision avoidance and resilience is very strong. However, the construction of bolt plate of cable guardrail is complicated, and it is difficult to repair the damage of end column, so it is not suitable for use in small radius curve section. At the same time, it has poor visibility and short length is not economical.
Guardrail bolt plate is composed of corrugated steel plate, guardrail bolt plate column, corrugated beam guardrail bolt end classification can well absorb the impact force of the car, but the self-recovery ability is poor, after the impact of the guardrail bolt plate needs to be replaced. 0(Type A code :F-1)200*200*3
Corrosion resistance: there are many kinds of anticorrosive ways of cable guardrail bolts and guardrail bolt plate, but they are basically after hot dip galvanizing treatment. The anticorrosive effect of hot dip galvanizing products is very perfect. Therefore, the anti-corrosion effect of the two highway protection products is very good.
Comparison of column firmness: there are many kinds of column specifications of guardrail bolt plate, which can be selected according to engineering needs. The cable guardrail bolt column specification range is small, but the diameter and thickness of the column are obviously better than the guardrail bolt plate column. Good technology processing, the use of anti-corrosion dip spraying aluminum, zinc dip spraying often achieve the effect is quite good, prolong the service life of the bolt plate of the highway crash guardrail.
Therefore, the firmness is obviously better than the guardrail bolt plate column. Maintenance: the maintenance amount of cable guardrail bolts is small. The price of guardrail bolts and screws in Meizhou city, Guangdong Province generally does not have a large degree of deformation, so the number of replacement is less; The maintenance of guardrail bolt plate is high. Once the vehicle crashes, the guardrail bolt plate generally needs to be replaced, because the guardrail bolt plate in Baotou City of Inner Mongolia needs its own deformation to slow down the impact force.
Therefore, the maintenance of guardrail bolt plate is significantly higher than the cable guardrail bolt. Yancheng city in jiangsu province highway crash barrier bolt installation price: through introducing the points above all it is not difficult to find cable guardrail bolt’s advantage is more noticeable, but the cable’s fence bolt is higher than the price of the fence panel, because the guard rail bolt plate with low cost, so the highway guardrail bolt plate installed on more. However, it is very important to install cable guardrail bolts in some dangerous areas, such as coastal roads, side cliff roads, mountain roads and so on.
Post time: Jul-11-2022
