文獻(xiàn)翻譯-輸送帶的二維動(dòng)態(tài)特性

1、附錄：中英文文獻(xiàn)翻譯名稱一一送帶的二維動(dòng)態(tài)特性附錄外文翻譯3.1英文The conveyor belt 2 d dynamic characteristicsl.SummaryThis paper will introduce a new belt conveyor system of the finite element model of. The model was developed to simulate the belt into the start and stop when the longitudinal and transverse dynamic response. Tha

2、t engineer can land in long distance belt conveyor system design stage of the application of the model, for example, design appropriate belt conveyor belt early test components curve remove a tight round. It also can make a tight round groove spacing and the profile of design optimization, to ensure

3、 that no take movement and determine the resonance with longitudinal and transverse vibration. Application feedback control technology to achieve the start and stop the optimization design of the program, and calculation of the dynamic characteristics of the belt can choose the most ideal when belt.

4、2.IntroductionThe Netherlands has long been regarded as a transportation and transport industry plays an important role in the economy of the country. Especially known as the gateway to Europe port of Rotterdam, claims to have the worlds largest seaports system. In addition to the huge number of con

5、tainer, a large number of goods in bulk and all of the port is through. Not all these items are in the Netherlands is the destination of the market, many will travel to other destinations in the cargo transfer points are in Rotterdam port. There is a very good example, typical for bulk cargo transpo

6、rt-coal and iron ore, a large portion of its destination is the German market. In order to deal with a wide range of different materials where transhipment, use the mechanical convey。, including belt conveyorThe longest length belt conveyer system mounted on a relatively small countries-the Netherla

7、nds, because they are mainly used for lots of materials flow transportation. The longest belt conveyor system, its length is about 2 km long, it is located in Rotterdam port part of-massey flamenco, g, it is used to transport oil from wholesale the massive coal to power station. Besides domestic eng

8、ineering projects, more and more the Dutch engineering consultant to participate in international to develop the land in large belt conveyor system. A delft university of science and technology is the one of the university of science and technology, and a mechanical engineering institute of technolo

9、gy, department of transportation is the study of the system in the development process of the difficulties of the typical meet.Conveyor belt and bulk solid material of interaction between the performance, belt conveyor structure and external environment will affect the conveying system requirements

10、to the reservation of the appropriate standards. Some interaction caused some difficult phenomenon, so he began to enter into the study of these phenomenon caused by the actual problem 1. The problem is one of the classification method, will the root causes obvious involves the conveyor belt these p

11、roblem into a class.The smooth mobile transient stress reduction, belt and design belt conveyor, provides the resonant caused no-load operation, is to describe the conveyor belt of the two most important dynamic factors 2. This paper presents a simulation program can start and stop when the belt lon

12、gitudinal and transverse response and stable operation of the movement when new belt conveyor system finite element model. Simulation of belt conveyor system startup procedure, its beyond the scope of this article about the result of the discussion, so well show a comparison of the feasibility of th

13、e model are examples.3.The finite element model of the belt conveyor systemIf used to drive belt conveyor system of total power , is with Germany industry standard 22101 to calculate the design, and then with hypothesis into a do not expand institution. This means that in a start and stop on the tak

14、e pressure when from the rigid body dynamics in the theory of Newton derived. Take the largest extend can use with stress calculated. This through the determination of elastic belt reaction method called standard static (design) method. For the small belt conveyor system, and it makes a belt of the

15、design and operation state qualified. However, for the long distance belt conveyor system, it may become a defective design, leading to the high cost of maintenance, shorten the life of the transport parts and well known work problems, such as:Weight of the machine drawing displacement is too largeT

16、ake a premature split, the main causes of the ground joint damageDamage roller and cause the belt a tight round significant damageMake the belt from the belt a tight round, which may lead to bulk raw material overflowCause (hydraulic power) drive system for damage and failureIn many researchers have

17、 developed models, the flexibility of the belt reaction is to determine if this is used to calculate the problems caused by the phenomenon. In most models, including the finite element model of the belt conveyor, and also for the used to calculate the belt in resistance and the changes of pressure.

18、The global reaction is elastic belt by all parts of the elastic response. The finite element model has been used in computer software, it can be used in long distance belt conveyor system design stage. This is called dynamic (design) method. Simulation results show that, with the model based on the

19、software program, prediction (system) start and stop with the flexibility of the reaction is quite successful, such as see 3 and 4.The finite element model of the certain just the longitudinal elastic belt reaction. Therefore, they cant accurately determine the:Roller and a tight round on the moveme

20、nt of the beltDriving conditionTake the resistance of the bending(shake) the evolution of stress waveWith depression and stress wave of longitudinal spread interactionsThe belt and roller interactionsBelt stabilization exercise with the influence of speedThrough the roller (driver) on the belt of th

21、e dynamic stressThe parameters of the belt to promote the resonance items or by roller when the eccentricity of vibration and belt caused transverse displacement of the influence of the relationshipThe development of the transverse wave verticalBy a large bulk materials and cross section area of the

22、 belt deformation caused by the influence of the resistancefrom the roller with produce the convex. Concave curveThe belt of the transverse elastic reaction is often lead to long distance belt conveyor system of the cause of the failure, and should be considered. Need to have 5 6 mention in the spec

23、ial model, to be sure of the transverse response with, but if considering the special factors (horizontal) response, can more easily expand the existing finite element model.3.1 BeltA typical belt conveyor structure including drive rollei, the tail roller, a vertical upward with the wheel, some roll

24、er and a chassis as shown in figure 1 below. This structure as an example to explain the conveyor belt of the finite element model was developed with only the longitudinal elastic response become main body.Because driving drum and ascend with round of the length of the belt between Ls, belt and the

25、total length of L is compared negligible, want to consider to improve the system of pulleys quality inertia, these pulleys could count rationally read to become a belt wheel. Due to take from point to another point movement change with resistance, according to local precise (maintenance) the conditi

26、on and the structure of the belt conveyor, along with length distribution. In order to be able to determine the distribution of stress with movement of the influence, the belt is divided into a number of different finite element, bring the stress distribution to be specific to the corresponding elem

27、ent. If care about is the longitudinal elastic belt reaction, with round by the movement of driving without power (the slip of a possible), take will these places has no effect. The design of the last step, this model can be made by two shares with driver characteristics and the power of the tension

28、 characteristics of driving system and replace belt tension system.Specifically, what resistance and finite element depends on the belt and the support structure of interaction between the effects, considering these problems may and mathematical description of the basic characteristics have belt mat

29、erial relationship. According to the explanation, the elements can be made by a representative of the system, as shown in figure 1 9 shows is that spring and damping, such systems are a finite element and node C and C + 1. Spring K and damping H representing take stretch viscoelastic shape, on behal

30、f of the belt variable G longitudinal structure stiffness, is by the role in two pulleys crisscross cross section of the vertical force generated, V belt speed depends on the representative resistance.If only the longitudinal deformation with is the main element, so it can be used in the model bridg

31、e wearing yuan of the belt elastic response. Bridge yuan part have shown in figure 2 shows the two nodes, P and Q, four displacement parameters carrier part X:xT = up vp uq vq The bridge of the yuan to planar movement has three separate rigid motion, so (this formula) is still describe a deformation

32、 of parameters.The length of the shaft bridge wearing yuan change, 7:ds2 - ds2og1 = D1(x) = f1 od?(2)2dS20DSO is not the length of the limit yuan deformation, the DS is limited yuan the length of the deformation, then did factor is along the axis of the finite element dimensionless length.Figure 3:

33、a static with depressionAlthough with a curving condition, but bridge yuan and no deformation, this may consider to take small numerical sag effect of static. With the ratio of static depression is a defined (see chart 3):K1 = 6/1 = q1/8T(3)Among them is exposed q and bulk materials with the weight

34、in the vertical direction on the distribution load, 1 is a wheel spacing, and T is the tension with. , the longitudinal deformation with sag depends on 7:K1 = 6/1 = q1/8T(3)Produce bridge wearing yuan total longitudinal deformation nonlinearBeams yuanFigure 4: node displacement and rotating the exac

35、t the bridge of the yuanIf take lateral displacement is the major factor, so it can be used to simulate the bridge wearing yuan belt. The same with six displacement parameters for the bridge of the yuan plane sport, equivalent to three separate rigid motion. So that left three deformation parameters

36、 is: longitudinal distortion parameterse 1, two bending deformation parameters 2 and e 3.Graph 5: the bridge wearing yuan of bending distortionThe parameters of the bending deformation bridge wearing yuan can be defined as the carrier of bridge wearing yuan (see chart 4):xT = up vp 叩 uq vq pq (5)And

37、 deformation of the structure as shown in figure 5e2p1pq2 = D2(x)=(6)1o-eq21pq3 = D3(x)=1oBypass roller and take the wheel with sportsWhen bypass roller or take wheel of time, take sport is restrained. In order to explain (clear) these factors, influence factors (borders) conditions must be added to

38、 the finite element simulation used to generation with. This can be through the use of multi-body dynamics are described herein. The machine for the dynamics of classical description, set up by some constraint conditions of connected rigid body or rigid links. In the (deformation) of the conveyor be

39、lt finite element description, take was separated into several finite element, the finite element is the connection between the distortion. By finite element is the conjunction node, so the displacement distribution parameters. To determine the movement of the belt, eliminate the rigid model of the

40、deformation model. If a belt around the rollerand decided on the position of the roller with (such as see figure 6) with length is & has been added to the vector components, such as: type (6), resulting in a seven displacement vector parameterFigure 6: the roller with supportBridge yuan have two sep

41、arate rigid motion, so still has five deformation parameters exist. One has been given in 3.1 in the e 1, e 2 and e 3, determined the belt deformation. Rest e 4 and e 5, determine the belt and the interaction between roller see figure 7.Figure 7: two constraint conditions the bridge of the yuan fini

42、te elementThese deformation parameters can assume the stiffness of elastic into the infinite. This means that:g4 = D4(x) = (r? + u e2 - rid.e2 = 0e5 = D5(x) = (r ? + u?)e1 - rid.e1 = 0(7)If the simulation is s 4 0, so take will from roller, and describe the finite element method with the constraint

43、conditions on will be removed.Rolling resistanceIn order to make a model can be applied to belt conveyor rolling resistance of the finite element model, has made a calculation of rolling resistance approximation formula, 8. Take sport, with the total exposure to the outside part of the rolling resis

44、tance, the three part is the main part of the energy consumption, can be divided into including: creasing rolling resistance, roller inertia (accelerate rolling resistance) and bearings rolling resistance (bearing resistance). Determine the parameters of the rolling resistance factors including diam

45、eter and roller materials, and various take parameters, such as speed, width, materials, tension, the environment temperature, with horizontal load, roller spacing and groove Angle. Total rolling resistance of factors, can says Adrian rodriguez huber-fernando, rolling resistance and take the proport

46、ion between the vertical load, defined as:ft = fi + fa + fb(8)Fi is creasing the rolling resistance coefficient, FA is accelerated resistance coefficient, and FB is bearing resistance coefficient. These components by the coefficient of 9 sure:Fi = CFznzh nhD-nD VbnvK-nk NTnTfa =fb =Mred 知(9)Fzb dt2M

47、fFzbriFZ with vertical direction is on the distribution of bulk cargo load and load combined, and H is covered with thickness, D is the diameter of the rollerVb is belt speed, with the name of KN is of the load than, T is the environment temperature, Mred roller is conversion of quality, B is the wi

48、dth of the belt, U is take of longitudinal displacement, MF is overall bearing resistance moment and RI is bearing internal radius. In the calculation of rolling resistance, the dynamic properties of belt and the mechanical properties of the material covered and belt plays an important role. This ma

49、kes the choice and take cover with materials and try to minimize the power resistance by the energy consumption of the cause.Belt drive systemBelt drive system in the stability of the belt movement circumstances, in order to can determine belt conveyor drive system of the influence of the rotating c

50、omponents, the beltconveyor is the total model must contain drive system model. The rotation of the drive system components, like a gearbox, refer to the stated in section 3.2 of the constraint conditions. With a slow down the than reducer, can use with two parameters of the deceleration element to

51、displacement instead, mu p and p q, like a rigid bodies (spin) movement, so that left a shape parameters:cred = Dred(x) = ipp + pq = 0(10)To determine the type torque inductive motor whether to get used to the so-called two shaft type motor. This phase voltage vector v from (11) get:v = Ri + wsGi +

52、L di/dt(11)In the (11) type I is obtained in vector, R is the model in resistance, c is the model in the inductance, L is the model is feeling coefficient and w s motor rotor is discussed.Electromagnetic torque equal to:Tc = iTGi (12)Motor model and drive system mechanical components by driving syst

53、em is the motion equation linked to: TOC o 1-5 h z 如d0kTi = ii + Cik Kil0(13)dVdtAmong them T is the torque vector, I was the inertia of the model, C is model damping, K and stiffness matrix is the motor of the axis of the angular velocity.Simulation start or stop program control feedback program ca

54、n be added to the belt drive system model, is used to control the drive torque.Motion equationMotion equation of the belt conveyor model can be obtained equations of motion of the principle of potential power, 7:fk - Mkl d2x1 / dt2 = zIDik(14)Motion equation of the belt conveyor model can be obtaine

55、d equations of motion of the principle of potential power, 7 : one F is resistance vector, M is the quality of the model and a is Lagrange multiplier vector, may explain for double pressure to vector e vector tension. In order to solve a set of equations with X this, equation is necessary to integra

56、tion. But the result of integration, must ensure that meet the constraints. If (8) type strain is zero, so must correct integration results, such as see 7. Can use the model of feedback options, such aslimit ascension substances on the direction of vertical movement. The problem with the dynamics of

57、 violations can be below formula said. In view of the model and its drive system with the ascension movement as is known to all, according to the proportion of freedom and its system (speed) can decide the other components of the movement. It is beyond the discussion in this paper about this all the

58、 details of the range.ExampleFor in the long distance belt conveyor system design stage can correctly design, the application of the finite element method. For example with the choice of intensity, can reduce the to reduce as far as possible, use the results of the simulation model to determine the

59、largest conveyor belt tension. With the function of the finite element model as an example, should consider the two roller position range between the transverse vibration with stable movement. In the design phase of the transport aircraft that must be sure, just to make sure of the time to take reso

60、nance.For the design of the belt conveyor for roller and mobile with interaction between influence is very important. Roller and pulleys geometric not perfect sex, lead to take from roller and belt wheel can support position, with and support with round in between produce a kind of transverse vibrat