CN109330020B - Design method of spoiler device of tobacco shred air supply system and spoiler device - Google Patents

Design method of spoiler device of tobacco shred air supply system and spoiler device Download PDF

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CN109330020B
CN109330020B CN201811147742.1A CN201811147742A CN109330020B CN 109330020 B CN109330020 B CN 109330020B CN 201811147742 A CN201811147742 A CN 201811147742A CN 109330020 B CN109330020 B CN 109330020B
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spoiler
wind
omega
representing
modal
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CN109330020A (en
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吕伟
徐玉中
张驰
王虎
徐泽龙
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China Tobacco Zhejiang Industrial Co Ltd
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China Tobacco Zhejiang Industrial Co Ltd
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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24CMACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/39Tobacco feeding devices
    • A24C5/392Tobacco feeding devices feeding pneumatically
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24CMACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/39Tobacco feeding devices
    • A24C5/399Component parts or details, e.g. feed roller, feed belt

Abstract

A design method of a spoiler device of a tobacco shred air supply system and the spoiler device are provided. The present invention provides a spoiler apparatus having a unitary structure that includes a front end portion and a rear end portion. The front portion is located at the front of the device for directing and inputting air flow and includes side panels, spring hinges and a wind surface. The rear end part is positioned at the rear part of the device and used for disturbing and directionally outputting air flow, and the rear end part comprises a disturbed flow channel, a disturbed flow cavity, a disturbed flow brake, a rebound pendulum blade and an air surface.

Description

Design method of spoiler device of tobacco shred air supply system and spoiler device
Technical Field
The invention relates to the related field of tobacco shred air supply systems, in particular to a spoiler device of a tobacco shred air supply system.
Background
The spoiler is usually arranged on the wind surface part of a moving object and is used for effectively reducing air resistance generated by the object during movement, reducing resonance caused by the air resistance and improving the movement stability of the object. The spoiler generally adopts the structure of wholly moulding, and when reducing resonance as a whole, the resonance force that each position bore is different, and the elastic deformation that produces after the resonance is also different. The air supply system is applied to an air supply system, and the design of the spoiler device also needs to adapt to the working conditions of air flow change and local vibration generated by a complex structure in the air supply system. Therefore, how to design a spoiler with high sensitivity and capable of keeping a stable state for a long time in a narrow space is one of the difficulties in the current design and application.
There are many ways to do this, with reference to other similar information in the country. For example: a method for analyzing noise of spoiler flow in a pipeline at hong Kong Richardson university (Oadaitai, Mzhuoming, China) reviews [ J ] architecture science, 2014,30(4):115-120) from the sound coupling effect between multiple spoilers to the sound and pneumatic coupling effect between the multiple spoilers, carries out deep research on the existing main calculation model, and provides a method for predicting noise of the spoiler in the pipeline. The aeromechanical engineering and automation college of Shanghai university (Wangka, Houjian Pingye, etc.. car rear spoiler dynamics analysis [ J ] based on numerical simulation industrial control computer, 2016,6(11):102 + 104) adopts a numerical simulation method to carry out aerodynamic analysis on an automobile, has the characteristics of short development time, low cost and the like, can obtain a large amount of relevant data of the external flow field of the whole automobile, and adopts a numerical simulation method to carry out stress analysis on the automobile provided with the rear spoiler to obtain an optimization result. The influence of a spoiler on the aerodynamic characteristics of a car is researched by a building and management institute (waiver, royal wave and the like) [ J ] mechanical design and manufacture, 2014,6(3):35-4) by taking computational fluid dynamics software ANSYS-FLUENT as a research tool to research the aerodynamic characteristics of the car. The resistance coefficient and the lift coefficient of the vehicle body before and after the turbulent flow device is added are calculated. The influence of the three models of the turbulence devices on the pneumatic characteristics of the car is analyzed. The flow field structure at the tail part of the car can be improved by additionally arranging the flow disturbing devices, the vortex phenomenon and the backflow phenomenon in the tail part area of the car are obviously weakened, the resistance coefficient of the car can be increased to different degrees by additionally arranging different flow disturbing plates, but the lift coefficient of the car can be reduced, and the aerodynamic characteristics of the car are further improved to a certain degree. The numerical simulation of a flow field of an airfoil profile with a spoiler at northwest industrial university (Sunjing, Yang Guangdong skirt and the like) [ J ] aviation computing technology, 2006,11(2):12-16) carries out unsteady numerical simulation on a flow field of an airfoil profile streaming flow with a spoiler, and respectively analyzes the influence of an attack angle and a spoiler deflection angle on aerodynamic performance, so that the fact that the spoiler deflection angle is fixed and increases along with the attack angle, the lift curve is good in linearity, the slope of resistance in a positive attack angle range is smaller than that of a negative attack angle, the attack angles are the same, the larger the spoiler deflection angle is, the smaller the lift force is, and the larger the resistance is. The influence of the adjustable spoiler on the high-speed braking efficiency in Jiangsu university (Luwenchang, Chenlong, etc.; manufacturing automation, 2014,9(15):34-38) analyzes the load transfer phenomenon during braking, provides the resistance coefficient and the lift coefficient of the spoiler at different angles, and provides a scheme for braking by using the adjustable spoiler. In addition, CarSim and MATLAB/Simulink are utilized to carry out combined simulation, so that the braking efficiency of the vehicle can be effectively improved, and the load of the rear axle of the vehicle is increased, thereby enhancing the stability of the vehicle.
One of the material sources for cigarette manufacturing in tobacco enterprises is cut tobacco, which usually adopts a wind-powered cut tobacco feeding mode, and the cut tobacco reaches the end manufacturing link of a cigarette making machine through a cut tobacco feeding machine by an air supply system. In the process, irregular air flow is generated in the air supply system continuously and is called as ' flocculation flow ', and the flocculation flow ' is determined by the structural characteristics of a fan of the air supply system and cannot be avoided. The fan is not always working in the tobacco shred conveying process, the fan is continuously started and stopped along with the change of tobacco shred demand, the air pressure in the air supply air pipe can change in the moment that the fan is started and stopped, the air pressure in the air supply air pipe is unbalanced, and then the air pipe can generate 'flocculation flow'. The 'wadding flow' can cause the tobacco shreds to be crushed and increased, so that the tobacco shred structure is damaged, and the tobacco shreds in the air pipe are blocked, therefore, a device capable of weakening or eliminating the 'wadding flow' needs to be designed in the air supply system.
Disclosure of Invention
In view of the above problems, in a first aspect, the present invention provides a method for designing a spoiler device of a tobacco shred air supply system, which can effectively eliminate "floc flow" in an air flow and reduce tobacco shred crumbling, the method comprising:
A. establishing spoiler minimized structure model based on static simulationWhere K represents a spoiler wind surface motion compensation factor, ρeRepresenting the material density of the wind surface of the spoiler, M representing the mass of the spoiler, fdThe method is characterized in that the method comprises the following steps that (1) the vibration frequency of a spoiler under full load of a wind surface of the spoiler is represented by omega, the swing frequency of the spoiler is represented by U, the dynamic response amplitude of the spoiler is defined by P, the side plate load amplitude of the spoiler is defined by P, and P (t) represents the load amplitude in a corresponding steady state in a period of time;
B. establishing spoiler sensitivity modelWherein the content of the first and second substances,representing the dynamic stiffness eigenvector of the spoiler,representing a static stiffness characteristic vector of the spoiler, p representing a compensation factor of the static stiffness of the spoiler, omega representing the swing frequency of the spoiler, S representing the wind surface area of the spoiler, and k representing a dynamic stiffness characteristic value (variable value);
C. generating a new load amplitude P' (t) and a new steady-state response reference value C based on a modal stacking methodd’;
Wherein the content of the first and second substances,Fiand JiRespectively representing the contribution degree of the modal superposition ith order characteristic to the dynamic stiffness of the spoiler and the contribution degree of the static stiffness of the spoiler; omegaiRepresenting a mode to superpose the swing frequency of the ith order spoiler;
and isWhere Ω is called the characteristic frequency of the modal superposition, ΩiCalled modal stacking ith order eigenfrequency;
wherein I is the order of the intercepted characteristic mode,is a structural i-th order characteristic modal vector, xiThe more the modal stacking times are, x is the motion damping valueiThe closer to zero damping.
Further, an optimized spoiler sensitivity model is establishedWherein U iseFor spoilersSensitivity feedback compensation factor, T for correlation, Kd for steady state response compensation factor,erepresenting an infinite acyclic decimal.
Further, when the dynamic stiffness matrix tends to be non-positive, P (t) is a negative value, the spoiler finally generates a fracture phenomenon, and an absolute value sign is introduced for correction, namely Cd=|P(t)TU|,CdReferred to as steady state response reference values. In addition
Furthermore, xi is optimally designed based on a frequency gradual change continuity design method, so that xi is kept in a high damping state, and the contribution degree of the static rigidity of the spoiler is improved.
Furthermore, the design method of continuity based on frequency gradual change, before the gradual change process begins, omegaiAt omegaiNot far to the right and (D)ωi-DΩi)<(Dωi+1-DΩi+1) Where D represents the absolute distance from the origin; at the beginning of the fade process, ω will beiAdjusted to omegaiNot far to the left and (D)ωi-DΩi)>(Dωi+1-DΩi+1) Since at the beginning of the fade process, xiBegin to tilt to the right, at which point ω is again tiltediWith xiMove together to the right but remain at the reference characteristic frequency omega all the timeiIs short of left side of and (D)ωi-Dωi-1)=(DΩi-DΩi-1) Until the modal gradual change process is finished, the current omega 'is obtained'iThe position is recorded as the next order omegai+1And during the next-order fade still will be ω'i+1Adjusted to omegai+1Is not far to the left, the continuous adjustment is made in this way.
Compared with the methods disclosed in the prior art, the method disclosed by the invention has the following differences:
the spoilers designed and described by the methods disclosed in the prior art are aerodynamically analyzed for noise and air resistance, and although certain characteristics of the spoilers are optimized to some extent, they are not analyzed for the overall structure of the spoilers, and the optimization degree is limited. According to the application environment of the spoiler, the overall structure of the spoiler is designed, the minimum design, the sensitivity design and the vibration damping steady-state design are sequentially carried out, and the minimum design, the sensitivity design and the vibration damping steady-state design are mutually associated and mutually influenced, so that the spoiler is strongly associated with the three designs.
The spoilers designed and described by the methods disclosed in the prior art are all in an open environment, and the volume and the mobility of the spoilers are not greatly restricted. However, in fact, spoilers can be used in closed and confined environments, which also have an effect on the air flow, so that none of the methods disclosed in the prior art has considered a minimum design of spoilers. The method is based on the actual requirement of the spoiler, a method based on the static simulation load amplitude is adopted, the spoiler is guaranteed to have certain toughness and flexibility, and the steady-state response reference value is introduced to observe the steady-state response condition of the spoiler under the current minimum condition in real time.
The spoiler designed and explained by the method disclosed in the prior art is relatively regular in air flow in an open environment, and the change of the air flow generated by the spoiler is relatively regular, so that the requirement on sensitivity response of the spoiler is not high. However, in fact, if the spoiler is installed in a closed environment, the air flow is mostly in irregular motion, and when the air flow passes through the spoiler, the spoiler tends to become unstable, for example, the motion is delayed, so that the methods disclosed in the prior art do not consider the sensitivity of the spoiler in the closed environment. The invention starts from the actual working condition of the spoiler, and ensures that the spoiler still has better sensitivity under the minimized condition and the maximum load condition based on the design of the optimality condition.
Spoilers designed and explained by the method disclosed in the prior art are mostly applied to dynamic moving objects, and the designed application models are mostly based on dynamic simulation to compensate the dynamic stiffness characteristics. However, in fact, the influence of static stiffness (such as inertial force, elastic deformation, etc.) of the moving object on the shape of the spoiler still exists, so none of the methods disclosed in the prior art considers the static stiffness characteristic of the spoiler, and the steady-state effect of the spoiler is limited. The method provided by the invention starts from the practical application of the spoiler, analyzes the static characteristics of the spoiler, and increases the contribution degree of the static rigidity of the spoiler by using a mode superposition method.
In a second aspect, the invention provides a spoiler device with an integral structure, which is generated based on the above design method, and the spoiler device comprises a front end part and a rear end part, wherein the front end part comprises two opposite side plates, a spring hinge and a first wind surface, and the first wind surface is connected with the two side plates through the spring hinge; the rear end part comprises a plurality of turbulence channels, a turbulence cavity, a turbulence gate, a rebound pendulum page and a second wind surface, the first wind surface and the turbulence cavity are communicated through the plurality of turbulence channels, the turbulence cavity is a closed space, the turbulence gate is arranged between the closed space and the second wind surface, the turbulence gate used for controlling wind pressure in the turbulence cavity is arranged in the closed space, after air flow in the turbulence cavity is continuously accumulated, the turbulence gate can be automatically opened due to the action of air pressure, and the air flow is filtered by the second wind surface and then is output; the first wind surface and the second wind surface are of a screen mesh structure integrally.
Preferably, the second wind surface is provided with a rebound pendulum blade.
Preferably, the side plate, the spring hinge and the first wind surface are made of aluminum alloy materials.
Preferably, the two ends of the turbulent flow channel are respectively provided with a round opening for connecting the wind surface at the front end and the turbulent flow cavity at the rear end.
Preferably, the side plate is smooth in surface, semicircular edge grooves are distributed in the surface, and the side face of the side plate is an arc-shaped face.
By adopting the technical scheme, the spoiler device has the characteristics of compact structure, convenience in disassembly and assembly, obvious effect and the like.
As can be seen from the above description, the inventive concept of the present invention is:
firstly, the minimum design is carried out on a spoiler device, which is based on a method for simulating load amplitude statically, a side plate load amplitude P and a side plate arc surface motion amplitude U of the spoiler are respectively defined, calculated into a minimum structure model, and substituted into time t to obtain the spoilerLoad amplitude P (t) and introducing a steady-state response reference value CdIs used to correct P (t) to prevent the occurrence of spoiler fracture phenomenon caused by the negative value of P (t) when the load amplitude P continues to increase after a period of time.
Then sensitivity design is carried out on the spoiler device, based on optimality conditions, under the condition that the current spoiler load amplitude is not changed, a sensitivity linear equation is directly obtained after the spoiler wind surface area is introduced, whether the spoiler load acting force position and the acting force direction are in positive correlation or negative correlation is judged by using a sensitivity limit value, and dynamic stiffness characteristic vectors are introduced againStatic stiffness eigenvectorA compensation factor p of static stiffness and a swing frequency omega are obtained, so that a spoiler sensitivity model Q (t) is obtained; in order to ensure the stability of the spoiler, after an optimality condition method is introduced, a load amplitude P (t) is added, after a regression operation is performed for the second time, the load amplitude P (t) is substituted into Q (t), and then an optimized sensitivity model Q' (t) is obtained.
And thirdly, carrying out vibration reduction steady-state design on the spoiler device, wherein the method is based on modal superposition, and after introducing a modal superposition response amplitude U '(t), generating a new load amplitude P' (t) and a new steady-state response reference value C after superpositiond', at C'dThere are two important parameters in the value, namely FiAnd JiRespectively representing the contribution degree of the modal superposition ith order characteristic to the dynamic stiffness of the spoiler and the contribution degree of the static stiffness of the spoiler, and observing two conditions generated when the spoiler generates resonance; meanwhile, damping x and characteristic frequency omega are used as optimization conditions, a frequency gradual change-based continuity design method is adopted, and the contribution degree F to the dynamic stiffness is obtainediAnd a static stiffness contribution JiFurther optimization is carried out, so that the spoiler has enough toughness and resilience when the structure is gradually changed, and the spoiler can bear larger pressure for a short time and can keep the knot for a long time in a special environmentStable structure and no deformation.
Finally, based on the model, the overall structure of the spoiler is designed, and the operation process is as follows:
after the air current got into the front end portion of spoiler, the spring hinge draws in automatically, when the air current passes through the curb plate, because the effect of arcwall face, the flow resistance of air current can reduce and get into first wind surface, the wind surface can filter the impurity in the air current, later the air flows through each vortex passageway and gets into the vortex chamber, in the vortex chamber, because of "wind-tunnel" effect, "the wadding flow" in the air current constantly is eliminated, treat the air current in the vortex chamber constantly gather the back, because atmospheric pressure effect, the vortex floodgate can open automatically, the air flows through the wind surface and once more filters the back output, in the continuous output process of air current, atmospheric pressure in the vortex chamber diminishes gradually until the vortex floodgate recloses, wait for opening next time.
Drawings
FIG. 1 shows an optimization design xiMiddle modal stack (same order omega)iIs located at omegaiLeft side of) graph;
FIG. 2 shows an optimization design of x-mode stacking (same order ω)iIs located at omegaiRight side) graph 2;
FIG. 3 continuity design method (same order ω)iIs located at omegaiRight side of) graph;
FIG. 4 is a design view of a spoiler device
FIG. 5 is a schematic view of the overall structure of the spoiler apparatus;
FIG. 6 is a top view of the spoiler apparatus (schematic view of the air flow changing state);
FIG. 7 is an expanded view of the front end portion of the spoiler apparatus;
FIG. 8 is an expanded view of the rear end portion of the spoiler apparatus;
wherein, 1-the front end portion; 11-side plate; 12-an arc-shaped surface; 13-spring hinge; 14-a first wind surface; 2-a back end portion; 21-rebounding to swing pages; 22-second wind surface; 23-a spoiler gate; 24-a flow-disturbing cavity; 25-turbulent flow channel.
Detailed Description
The invention will be described in more detail with reference to the drawings, which illustrate the inventive concept and the inventive process
The invention provides a spoiler device which can be directly applied to a tobacco shred air supply system
A design method of a spoiler device of a tobacco shred air supply system comprises a minimization design method, a sensitivity design method, a vibration reduction steady state design method and an overall structure design method.
A. A minimized design of a spoiler. The air supply system has a complex structure and a narrow and compact internal space, so that the design of the spoiler should be considered to be minimized and the spoiler must be adapted to the state of continuous adjustment motion, and therefore, the minimized design of the spoiler is based on a static simulation load amplitude method to ensure that the device has certain toughness and flexibility.
In the method for statically simulating the load amplitude, the side plate load amplitude of the spoiler is defined as P, the arc surface motion amplitude of the side plate of the spoiler is defined as U, and the load amplitude P is the wind surface amplitude and the motion amplitude U is the amplitude in the corresponding steady state (compared with the vibration state) under the influence of the irregularity of the motion state of the spoiler.
The spoiler minimizing structure model based on the static simulation is established as described above, namely:
U(t)=KρeM
fd=ωρe
P(t)=Ueifd
where K denotes the spoiler wind surface motion compensation factor, ρeRepresenting the material density of the wind surface of the spoiler, M representing the mass of the spoiler, fdThe panel vibration frequency at full load on the spoiler wind surface is represented by ω, which represents the swing frequency of the spoiler.
Where U is defined as the spoiler dynamic response amplitude, the load amplitude at a corresponding steady state over a period of time can be expressed asP(t)=Ueifd
As mentioned above, the dynamic stiffness matrix tends to be non-positive when the spoiler load amplitude P is higher, and P (t) is negative, so that the spoiler finally breaks. For this reason, in the above expression, the absolute value sign is introduced for correction, i.e. Cd=|P(t)TU|,CdReferred to as steady state response reference values. In addition, C can be used to ensure that the steady state response is lineardThe steady-state response condition of the spoiler under the current minimization condition is observed in real time.
B. The sensitivity design of the spoiler is described. The air supply system is internally provided with irregular air resistance called choked flow, the choked flow can influence the motion state of the wind surface of the spoiler, if the moving part of the spoiler fails to act in time, the spoiler can generate action lag, and the working stability of the spoiler is influenced, so that the spoiler has certain sensitivity in consideration of the design of the spoiler. Therefore, the sensitivity of the spoiler is designed based on an optimality condition so as to ensure that the spoiler still has better sensitivity under the condition of minimization and meeting the maximum load condition.
With the aforementioned spoiler sensitivity design, the eigenvector of the sensitivity under the current spoiler load condition can be directly derived to obtain a linear equation, that is:wherein S represents the wind surface area of the spoiler, and when the load action position and the action direction of the spoiler are in positive correlation, the load of the spoiler is called as linear positive correlation load.
As before the design of spoiler sensitivity, if spoiler load effort position and effort direction are positive correlation characteristic, corresponding sensitivity is:the higher the spoiler sensitivity; on the contrary, if the spoiler load acting force position and the acting force direction are in the negative correlation characteristic, the smaller the sensitivity of the corresponding spoiler is, namely:
as for the sensitivity feature vector, the sensitivity of the spoiler is defined as Q, and the stiffness feature vector is added to obtain a sensitivity model of the spoiler, that is:whereinRepresenting the dynamic stiffness eigenvector of the spoiler,the static stiffness characteristic vector of the spoiler is represented, p represents a compensation factor of the static stiffness of the spoiler, and omega represents the swing frequency of the spoiler.
The sensitivity model of the spoiler as described above, considering the long-term stability requirement of the spoiler operation, introduces the optimality condition method, namely:and substituted into the linear equation, i.e.:
on the basis, a load amplitude P (t) is further added into the linear equation to carry out a regression operation, so that:and substituting the sensitivity model into the original sensitivity model to obtain the optimized spoiler sensitivity model, namely:
wherein U iseAnd feeding back a compensation coefficient for the sensitivity of the spoiler.
C. The damping steady state design of a spoiler. The air supply system can generate periodic mechanical vibration during operation, so that the spoiler is caused to resonate, the frequency and the strength of the resonance can directly influence the long-term working stability of the spoiler, and the operation of the spoiler is in an unsteady linear relation, so that the spoiler has a damping steady-state effect under the design consideration, namely the spoiler has certain toughness and resilience. Therefore, the steady-state design of the vibration reduction of the spoiler is based on a mode superposition method so as to ensure that the spoiler still has certain stability when working for a long time.
In the steady-state design of the spoiler damping, the dynamic response amplitude of the spoiler during the modal superposition, referred to as the modal superposition response amplitude, can be expressed as:where I is the order of the truncated characteristic mode,is a structural i-th order characteristic modal vector, xiThe more the modal stacking times are, x is the motion damping valueiThe closer to zero damping.
As with the modal stack response amplitudes previously described, the load amplitudes p (t) yield new load amplitudes after stacking, i.e.:where Ω is called the characteristic frequency of the modal superposition, ΩiReferred to as mode superposition characteristic frequency of the i-th order.
The amplitude of the modal superposition response, U' and x, as described aboveiSubstitution into CdValue, a new steady state response reference value C under the mode superposition can be obtainedd', i.e.:whereinFiAnd JiAnd respectively representing the contribution degree of the ith order characteristic of the modal stack to the dynamic stiffness of the spoiler and the contribution degree of the static stiffness of the spoiler.
As mentioned above, when the spoiler resonates, two conditions occur: firstly, when the load amplitude P' (t) of the spoiler approaches to the swing frequency omega of the spoiler, the dynamic stiffness contribution degree of the spoiler is larger, and the spoiler resonance is gentler; conversely, the more intense the spoiler resonance. When the modal superposition response amplitude U' (t) approaches xiIn a zero damping state, the smaller the contribution degree of the static rigidity of the spoiler is, the more violent the resonance of the spoiler is; conversely, the more gradual the spoiler resonance.
Under the spoiler resonance condition, the damping has a certain slowing effect on the resonance, and the dynamic response amplitude U' (t) is seen to trend towards xiAt high damping state, damping xiHas good inhibition effect, otherwise, the inhibition is smaller. Since the spoiler oscillating frequency ω is a fixed periodic range value and cannot be optimized, reducing the resonance of the spoiler can only be solved by optimizing the modal superposition response amplitude U' (t).
Optimizing the dynamic response amplitude U '(t) as described above, substituting U' and then adding the mode superposition reference value Cd' can contribute degree F by dynamic stiffnessiAnd a static stiffness contribution JiThe superposition of (A) and (B) yields, in fact, the contribution F in comparison with the dynamic stiffnessiDegree of contribution of static stiffness JiIs more convenient to optimize because of the degree of contribution F in dynamic stiffnessiThe spoiler roll frequency ω and the spoiler vibration frequency FdAre all fixed cycle range values, cannot be optimized any more, and have a static stiffness contribution JiInvolving a motion damping value xiSo the most convenient way is by optimally designing xiLet x beiThe high damping state is kept, and the contribution degree of the static rigidity of the spoiler is improved.
Optimization design x as described aboveiAssuming an initial state, the reference characteristic frequency of the modal superposition is Ω1Then, two cases are considered during the optimization design:
one of the two cases of the optimized design as described above, namely the spoiler oscillating frequency ω1Slightly less than reference characteristic frequency omega1In the axes of modal superposition, of the same order omegaiIs located at omegaiLeft side of (a), the resulting motion damping xiTo keep the structure balanced, it will tilt itself to the right and drive ΩiMoving to the right, the corresponding static stiffness contribution JiAlso shift the whole body to the right, as shown in FIG. 1, the motion damping is improved (x) for the optimized state S2 compared to the initial state S12>x1) Its static stiffness contribution is greatly increased (J)2>>J1)。
Two cases of the optimized design as described above, namely the spoiler oscillating frequency ω1Slightly greater than reference characteristic frequency omega1In the axes of modal superposition, of the same order omegaiIs located at omegaiRight side of (1), the resulting motion damping xiTo maintain structural balance, will bias itself to the left, but with a damping xiCharacteristic influence of (i.e. x)iBelongs to friction damping, the mechanical energy of the damping can be reduced during movement and converted into internal energy to stop the vibration of the spoiler), so that x is enablediLeaning to the left first and then still slightly to the right, due to xiThe slope of the tilt to the right is small, which makes it possible to drive at omegaiWhen moving to the right, though still make omegaiUpper order eigenvalue omega exceeding the reference eigenfrequencyi-1But with limited overshoot, the corresponding static stiffness contribution JiAlthough the whole body is also shifted to the right, the right shift amplitude is not large, and as shown in FIG. 2, the motion damping is improved (x) in the optimized state S2' compared with the initial state S12>x1) But its static stiffness contribution increases only to a limited extent (J)2>J1)。
Optimization design x as described aboveiTwo cases are considered, it can be seen that although xiBoth of the optimized designs increase the contribution of the static stiffness of the spoiler structure, but in comparison, when the spoiler oscillating frequency ω is higher than1Slightly less than reference characteristic frequency omega1In the case of (2), the design is given so that the contribution degree of the static rigidity of the spoiler is greatly increased, and the change process is very fast, namely the time isThe interval t is small and the static stiffness contribution J is smalliBut greatly increased, so that the shaping structure of the spoiler becomes more flexible and can bear resonance, and the risk of fracture is reduced. This feature is applicable to the front part of the spoiler, since the resonance force experienced there is the largest, but the resonance interval is short.
Optimization design x as described aboveiTwo cases are considered, it can be seen that when the spoiler swings at a frequency ω1Slightly greater than reference characteristic frequency omega1In this case, although the design is given such that the static stiffness contribution of the spoiler is increased, this is a gradual process, which means that the time t is increased and the static stiffness contribution J is increasediAlthough the number of the springs is increased, the process is slow, so that the feedback elasticity of the spoiler shaping structure is prolonged, and the spoiler has good resilience. This feature is applicable to the rear part of the spoiler, since the resonance forces experienced there are not large, but are influenced by the inertia of the overall movement of the spoiler, the rebound oscillations are very frequent and the time interval between each rebound oscillation is very long.
Optimization design x as described aboveiThe two cases are considered, and the two cases can be respectively designed and applied to the front end and the rear end of the spoiler, so that the spoiler has better toughness and resilience at the same time. However, sometimes in special environments, such as high-temperature, high-humidity and dusty environments, part of the shaped structure of the spoiler becomes unstable during long-time working, and the damping effect is also reduced, so that the spoiler is required to have a sufficiently large static stiffness contribution degree during gradual change, and therefore, a further optimized design for the damping steady state of the spoiler is required.
The optimal design for the further steady damping of the spoiler is a continuous design method based on frequency gradual change, especially when the spoiler swings at a frequency ω1Slightly greater than reference characteristic frequency omega1In the case of (1), ω is gradually changed during the processiAnd ΩiNot far apart and ωiCompare omegai-1When the deviation is not far away, the optimization method can avoid the instability of the spoiler in the long gradual change processSuch as a mouse.
As mentioned above, the method for designing continuity based on frequency gradual change, before the gradual change process, ω isiAt omegaiNot far to the right and (D)ωi-DΩi)<(Dωi+1-DΩi+1) Where D represents the absolute distance from the origin; at the beginning of the fade process, ω will beiAdjusted to omegaiNot far to the left and (D)ωi-DΩi)>(Dωi+1-DΩi+1),xiBegin to tilt to the right, at which point ω is again tiltediWith xiMove together to the right but remain at the reference characteristic frequency omega all the timeiIs short of left side of and (D)ωi-Dωi-1)=(DΩi-DΩi-1) Until the modal gradual change process is finished, the current omega 'is obtained'iThe position is recorded as the next order omegai+1And during the next-order fade still will be ω'i+1Adjusted to omegai+1Just to the left, the continuous adjustment is made as such, as shown in fig. 3.
The method for designing continuity based on frequency gradient as described above, i.e. the spoiler oscillating frequency ω1Slightly greater than reference characteristic frequency omega1In the case of (2), described in the initial same order ωiIs located at omegaiIn the right-hand case, the continuity design method also enables the static stiffness contribution to reach the spoiler roll frequency ω1Slightly less than reference characteristic frequency omega1The spoiler has enough toughness and resilience when the structure is gradually changed, and can bear larger pressure in a short time and keep stable structure and deformation for a long time in a special environment.
Based on the above design method, in order to reduce or eliminate the "floc flow" in the air supply system, the invention further generates a spoiler device with an integral structure, as shown in fig. 5-8, the spoiler device can effectively eliminate the "floc flow" in the air flow through surveying and mapping design, and reduce the breakage of cut tobacco. The device comprises a front end part 1 and a rear end part 2, wherein the front end part 1 is positioned at the front part of the device and is used for guiding and inputting air flow, and the front end part 1 comprises a side plate 11, a spring hinge 13 and a first wind surface 14, and the first wind surface is connected with the two side plates through the spring hinge; the rear end part 2 is positioned at the rear part of the device and used for interfering and directionally outputting air flow, and comprises a turbulence channel 25, a turbulence cavity 24, a turbulence gate 23, a rebound pendulum blade 21 and a second air surface 22, wherein the first air surface 14 and the turbulence cavity 24 are communicated through the plurality of turbulence channels, the turbulence cavity is a closed space, the turbulence gate is arranged between the closed space 24 and the second air surface 22, the turbulence gate 23 used for controlling the air flow in the turbulence cavity is arranged in the closed space, after the air flow in the turbulence cavity is continuously accumulated, the turbulence gate can be automatically opened due to the air pressure effect, and the air flow is filtered by the second air surface and then is output; the first wind surface and the second wind surface are of a screen mesh structure integrally.
As a further improvement, the side plate 11 is made of aluminum alloy material, the surface is smooth and is fully distributed with semicircular edge grooves with the radius of 2mm, and the side surface of the side plate 11 is an arc-shaped surface 12 for reducing the flow resistance of air flow and guiding the air flow to enter the wind surface.
As a further improvement, the spring hinge 13 is made of aluminum alloy materials, and can be automatically folded and unfolded at a fixed angle to support the side plates on the two sides.
As a further improvement, the first wind surface 14 is made of aluminum alloy material, holes with the diameter of 3mm are fully distributed on the surface, and the whole body is of a screen mesh structure and is used for filtering air flow.
As a further improvement, two ends of the turbulent flow channel 25 are respectively provided with a circular opening for connecting the front wind surface 14 and the rear turbulent flow cavity 24, and in this embodiment, there are 8 turbulent flow channels.
As a further improvement, the turbulent flow cavity 24 is a closed space, after the air flow enters the turbulent flow cavity through the turbulent flow channel, because the tail end hole of the turbulent flow channel still continuously outputs the air flow, a transient 'wind tunnel' effect can be formed in the turbulent flow cavity, and along with the accumulation of the 'wind tunnel' effect, the air flow can form 'self-circulation' in the cavity, and the 'flocculation flow' in the air flow is continuously eliminated.
As a further improvement, the turbulence chamber 24 in have the turbulence gate 23, the turbulence gate is in the closed condition under the acquiescence state, under this state, the air flow gets into the turbulence intracavity and constantly gathers, when gathering to a certain extent, the air pressure in the turbulence intracavity can grow, the turbulence gate is influenced by pressure and is opened automatically, air flow output, the air pressure in the turbulence intracavity diminishes this moment, the turbulence gate receives the influence of gravity to be in the closed condition again, waits to open next time.
As a further improvement, the whole second wind surface is also of a screen structure, a rebound flap is arranged on the second wind surface, the rebound flap 21 adopts two pieces of elliptic and mutually overlapped wind flaps which are oppositely arranged on the second wind surface, and the wind flaps are provided with springs with moderate elasticity and can be automatically folded. When air flow exists, the air flap is automatically opened under the influence of wind pressure, the air flow is output, and then is automatically closed under the influence of elasticity, so that the outside air is prevented from entering.
Finally, based on the model, the overall structure of the spoiler is designed, and the operation process is as follows:
when the air flow enters the front end part 1 of the spoiler, the spring hinges 13 are automatically folded, when the air flow passes through the side plate 11, due to the action of the arc-shaped surface 12, the flow resistance of the air flow can be reduced and enters the first air surface 14, the first air surface 14 can filter impurities in the air flow, then the air flows through each spoiler channel 25 and enters the spoiler cavity 24, in the spoiler cavity 24, "floc flow" in the air flow is continuously eliminated due to the wind tunnel effect, after the air flow in the spoiler cavity 24 is continuously accumulated, due to the air pressure action, the spoiler gate 23 can be automatically opened, the air flows through the air surface 22 and is output after being filtered again, and in the continuous output process of the air flow, the air pressure in the spoiler cavity 24 is gradually reduced until the spoiler gate 23 is closed again, and the next opening is waited.
By adopting the technical scheme, the spoiler device has the characteristics of compact structure, convenience in disassembly and assembly, obvious effect and the like.

Claims (10)

1. A design method of a spoiler device of a tobacco shred air supply system is characterized by comprising the following steps:
A. establishing spoiler maximum based on static simulationSmall structure modelWhere K represents a spoiler wind surface motion compensation factor, ρeRepresenting the material density of the wind surface of the spoiler, M representing the mass of the spoiler, fdThe method is characterized in that the method comprises the following steps that (1) the vibration frequency of a spoiler under full load of a wind surface of the spoiler is represented by omega, the swing frequency of the spoiler is represented by U, the dynamic response amplitude of the spoiler is defined by P, the side plate load amplitude of the spoiler is defined by P, and P (t) represents the load amplitude in a corresponding steady state in a period of time;
B. establishing spoiler sensitivity modelWherein the content of the first and second substances,representing the dynamic stiffness eigenvector of the spoiler,representing a static stiffness characteristic vector of the spoiler, p representing a compensation factor of the static stiffness of the spoiler, and omega representing the swing frequency of the spoiler, wherein S represents the wind surface area of the spoiler, and k represents a dynamic stiffness characteristic value;
C. generating a new load amplitude P' (t) and a new steady-state response reference value C based on a modal stacking methodd’;
Wherein the content of the first and second substances,Fiand JiRespectively representing the contribution degree of the modal superposition ith order characteristic to the dynamic stiffness of the spoiler and the contribution degree of the static stiffness of the spoiler; omegaiRepresenting a mode to superpose the swing frequency of the ith order spoiler;
and isWhere Ω is called the characteristic frequency of the modal superposition, ΩiCalled modal stacking ith order eigenfrequency;wherein I is the order of the intercepted characteristic mode,is a structural i-th order characteristic modal vector, xiThe more the modal stacking times are, x is the motion damping valueiThe closer to zero damping.
2. The method of claim 1, wherein an optimized spoiler sensitivity model is establishedWherein U iseFor spoiler sensitivity feedback compensation coefficient, T represents correlation, Kd represents steady state response compensation factor, and e represents an infinite acyclic decimal.
3. The design method of the spoiler device of the tobacco shred blowing system according to claim 1, wherein the dynamic stiffness matrix tends to be non-positive, P (t) is negative, and an absolute value sign is introduced to correct Cd=|P(t)TU|,CdReferred to as steady state response reference values.
4. The design method of the spoiler device of the tobacco shred air supply system according to claim 1, wherein xi is optimally designed based on a frequency gradual change continuous design method, so that xi is kept in a high damping state, and the contribution degree of static rigidity of the spoiler is improved.
5. Cut tobacco air supply according to claim 4The design method of the system spoiler device is characterized in that: a continuous design method based on frequency gradual change is characterized in that before a gradual change process is started, omegaiAt omegaiNot far to the right and (D)ωi-DΩi)<(Dωi+1-DΩi+1) Where D represents the absolute distance from the origin; when the fade process starts, ω will now beiAdjusted to omegaiNot far to the left and (D)ωi-DΩi)>(Dωi+1-DΩi+1) At this time xiBegin to tilt to the right, at which point ω is again tiltediWith xiMove together to the right but remain at the reference characteristic frequency omega all the timeiIs short of left side of and (D)ωi-Dωi-1)=(DΩi-DΩi-1) Until the modal gradual change process is finished, the current omega 'is obtained'iThe position is recorded as the next order omegai+1And during the next-order fade still will be ω'i+1Adjusted to omegai+1Is not far to the left, the continuous adjustment is made in this way.
6. A spoiler device having an integral structure, produced by the design method according to any one of claims 1 to 5, wherein: the device comprises a front end part (1) and a rear end part (2), wherein the front end part comprises two opposite side plates (11), a spring hinge (13) and a first wind surface (14), and the first wind surface (14) is connected with the side plates on the two sides through the spring hinge (13); the rear end portion includes a plurality of vortex passageways (25), vortex chamber (24), vortex floodgate (23), kick-backs pendulum page or leaf (21) and second wind face (22), through first wind face of this a plurality of vortex passageways intercommunication and vortex chamber (24), the vortex chamber is an enclosure space, and is equipped with vortex floodgate (23) that are used for controlling vortex intracavity atmospheric pressure between this enclosure space and the second wind face, treats that the air current in the vortex intracavity constantly gathers the back, because atmospheric pressure effect, the vortex floodgate can open automatically, and the air flows through the second wind face and filters the back output, and first wind face and second wind face wholly are the screen cloth structure.
7. The spoiler apparatus having a unitary structure according to claim 6, wherein: the second wind surface is provided with a rebound pendulum page.
8. The spoiler apparatus having a unitary structure according to claim 6, wherein: the side plates (11), the spring hinges (13) and the first wind surface (14) are made of aluminum alloy materials.
9. The spoiler apparatus having a unitary structure according to claim 6, wherein: the two ends of the turbulent flow channel are respectively provided with a round opening for connecting the wind surface at the front end with the turbulent flow cavity at the rear end.
10. The spoiler apparatus having a unitary structure according to claim 6, wherein: the side plate is smooth in surface, semicircular edge grooves are distributed in the surface, and the side face of the side plate is an arc-shaped face.
CN201811147742.1A 2018-09-29 2018-09-29 Design method of spoiler device of tobacco shred air supply system and spoiler device Active CN109330020B (en)

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