WO2019140830A1 - 基于一阶动态滑模变结构的桥吊防摆方法 - Google Patents
基于一阶动态滑模变结构的桥吊防摆方法 Download PDFInfo
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- WO2019140830A1 WO2019140830A1 PCT/CN2018/089510 CN2018089510W WO2019140830A1 WO 2019140830 A1 WO2019140830 A1 WO 2019140830A1 CN 2018089510 W CN2018089510 W CN 2018089510W WO 2019140830 A1 WO2019140830 A1 WO 2019140830A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
- B66C13/063—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads electrical
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/46—Position indicators for suspended loads or for crane elements
Definitions
- the invention relates to the technical field of bridge cranes, in particular to a bridge crane anti-swing method based on a first-order dynamic sliding mode variable structure.
- the bridge crane system is essentially a kind of complex underactuated nonlinear control system, which plays an irreplaceable role in modern industrial production. Due to its high theoretical value and practical value, domestic and foreign authors have never interrupted bridges. Research on crane positioning control problems.
- variable rope length In the case of variable rope length, some researchers have adopted the layered sliding mode and time-varying sliding mode control method to realize the anti-rolling positioning control of the bridge crane under the condition of variable rope length, but the control rate design steps are cumbersome and not Consider the chattering phenomenon unique to sliding mode control.
- an object of the present invention is to provide a bridge crane anti-swing method based on a first-order dynamic sliding mode variable structure, which can realize the anti-swing positioning control of the system, and can effectively weaken the chattering of the sliding mode variable structure control. phenomenon.
- the bridge crane anti-swing method based on the first-order dynamic sliding mode variable structure comprises the following steps: S10, real-time monitoring parameters of the bridge crane system, and establishing a two-dimensional bridge crane system model, the two-dimensional bridge crane system model including weights and A bridge crane for lifting heavy objects, and a weight is connected to the overhead crane by a rope;
- the position coordinates of the bridge crane and the weight are respectively determined as:
- x M and y M are the X-axis coordinate and the Y-axis coordinate of the overhead crane, respectively, x m and y m are the X-axis coordinate and the Y-axis coordinate of the weight, respectively, and ⁇ is the swing angle when the weight swings, l is the length of the rope, x is the displacement in the horizontal direction when the weight is swung, and the displacement x, the length l and the swing angle ⁇ are the parameters of the bridge crane system that need real-time monitoring;
- M is the mass of the bridge crane
- f 1 is the horizontal traction force of the bridge crane
- D is the drag coefficient
- f 2 is the traction along the rope of the weight
- m is the mass of the weight
- the crane system control model includes a dynamic sliding surface s 1 of the crane position containing the dynamic change of the swing angle and a long dynamic slip of the rope containing the dynamic change of the rope length die face s 2, the position of the crane the s 1 and the dynamic sliding surface sliding surface dynamic cable length s 2 constructed by the following equation:
- x d is the displacement reference value of the bridge crane, which is a constant
- l d is the rope length reference value of the rope, which is a constant
- a, b, c, d, a 1 and b 1 are constants greater than 0 ;
- function I a bipolar Sigmoid function with the same definition as the symbol function sgn(s i );
- step S30 according to the two-dimensional bridge crane system model, the second derivative formula of the displacement x, the length l, and the swing angle ⁇ is respectively obtained, including the following steps:
- the crane system control model further includes a first linear operation module, a first controller, a second linear operation module, a second controller, a crane system module, and a first input for inputting the displacement reference value x d a module and a second input module for inputting a rope length reference value l d ;
- the first input module, the first linear operation module, the crane position dynamic sliding surface s 1 , the first controller and the crane system module are sequentially connected, the crane system The module respectively outputs a swing angle ⁇ and a displacement x to the first linear operation module and the first input module;
- the second input module, the second linear operation module, the rope length dynamic sliding surface s 2 , the second controller and the crane system module Connected in sequence, the crane system module feeds back the output length l to the second input module.
- step S50 the exponential approach law control method and a dynamic sliding mode surface of a crane position a long dynamic sliding surface The relationship between:
- step S60 the second derivative of the displacement x, the length l, and the swing angle ⁇ is combined with a dynamic sliding surface of the crane position a long dynamic sliding surface
- the first derivative formula of the horizontal traction force f 1 and the rope traction force f 2 is obtained, including the following steps:
- step S70 the integrator respectively disposed within the first and second controllers, the first and second controllers, respectively, to the cable car system module output level along the traction force and traction ropes f 1 f 2.
- the invention has the beneficial effects of: monitoring the parameters of the bridge crane system in real time based on the first-order dynamic sliding mode variable structure bridge crane anti-swing method, and establishing a two-dimensional bridge crane system model according to the two-dimensional bridge crane system
- the relevant parameters in the model respectively establish the second derivative formula of displacement x, length l and swing angle ⁇ , and then construct the control model of the crane system to establish the dynamic sliding surface s 1 of the crane position with dynamic change of the swing angle and the dynamic change of the rope length.
- the long dynamic sliding surface s 2 of the rope is related to the displacement x, the length l and the swing angle ⁇ due to the relationship between the dynamic sliding surface s 1 of the crane position and the dynamic sliding surface s 2 of the rope length, so according to the position of the crane
- the horizontal traction force f 1 and the rope traction force f 2 obtained by the dynamic sliding surface s 1 and the rope length dynamic sliding surface s 2 are also related to the displacement x, the length l and the swing angle ⁇ , so when the pair of bridge cranes And the weights respectively apply an equivalent force opposite to the horizontal traction force f 1 and the direction along the rope traction force f 2 , so that when the bridge crane system is subjected to the anti-swing treatment, the displacement x, the length l and the swing angle ⁇ will correspondingly occur.
- the neighborhood is the boundary layer of the sliding mode switching plane.
- the quasi-sliding mode does not require the condition of the sliding mode, so the switching of the control structure on the switching surface is not required. Therefore, the chattering phenomenon can be fundamentally avoided or weakened.
- Figure 1 is a schematic view of a two-dimensional bridge crane system model
- FIG. 2 is a schematic diagram of a control model of a crane system.
- the bridge crane anti-swing method based on the first-order dynamic sliding mode variable structure of the present invention for the control problem of the two-dimensional under-actuated bridge crane under the condition of variable rope length, will contain the dynamic change of the swing angle and the rope.
- the parameters of the bridge crane system are first monitored in real time, and a two-dimensional bridge crane system model is established.
- the position coordinates of the bridge crane 2 and the weight 1 are:
- x M and y M are the X-axis coordinate and the Y-axis coordinate of the overhead crane 2, respectively, x m and y m are the X-axis coordinate and the Y-axis coordinate of the weight 1, respectively, and ⁇ is the weight 1 when the weight 1 is swung.
- the swing angle, l is the length of the rope, and x is the displacement in the horizontal direction when the weight 1 is swung.
- the displacement x, the length l and the swing angle ⁇ are the parameters of the bridge crane system that need real-time monitoring.
- the Lagrangian equation of the two-dimensional bridge crane system model can be obtained as:
- M is the mass of the overhead crane 2
- f 1 is the horizontal traction force that the overhead crane 2 receives
- D is the drag coefficient
- f 2 is the rope traction force that the weight 1 receives
- m is the mass of the weight 1.
- the crane system control model includes a dynamic position of the crane position sliding surface s 1 containing the dynamic change of the swing angle, and the rope length dynamics including the dynamic change of the rope length.
- a sliding surface s 2 a sliding surface s 2 , a first linear operation module 3 , a first controller 4 , a second linear operation module 5 , a second controller 6 , a crane system module 7 , a first input module for inputting a displacement reference value x d 8 and a second input module 9 for inputting a rope length reference value l d ;
- the modules 7 are sequentially connected, and the crane system module 7 respectively feeds back the output swing angle ⁇ and the displacement x to the first linear operation module 3 and the first input module 8; the second input module 9, the second linear operation module 5, the rope length dynamic sliding mode
- the surface s 2 , the second controller 6 and the crane system module 7 are connected in sequence, and the crane system module 7 feeds back the output length l to the second input module 9 .
- the displacement x, the length l, the swing angle ⁇ , the horizontal traction force f 1 , and the traction force f 2 along the rope interact with each other, and the horizontal traction force f is applied to the overhead crane 2 and the weight 1 respectively.
- the crane position dynamic sliding surface s 1 and the rope length dynamic sliding surface s 2 are constructed by the following formula:
- x d is the displacement reference value of the overhead crane 2, which is a constant
- l d is the rope length reference value of the rope, which is a constant
- a, b, c, d, a 1 and b 1 are all greater than 0 constant
- ⁇ is a normal number, function Is a bipolar Sigmoid function with the same definition as the symbol function sgn(s i );
- the first derivative formula of the horizontal traction force f 1 and the rope traction force f 2 can be obtained as:
- the relationship between the displacement x, the length l, the swing angle ⁇ , the horizontal traction force f 1 , and the traction force f 2 along the rope is shown in the above equation. Since the integrator is provided in each of the first controller 4 and the second controller 6, the first controller 4 and the second controller 6 respectively output the horizontal traction force f 1 and the rope traction force f 2 to the crane system module 7, Therefore, the horizontal traction force f 1 and the first derivative of the rope traction force f 2 are integrated in the first controller 4 and the second controller 6, respectively, and converted into the horizontal traction force f 1 and the rope traction force f 2 , followed by the horizontal traction force.
- the f 1 and the traction force f 2 along the rope are respectively input into the crane system module 7 to change the displacement x, the length l, and the swing angle ⁇ .
- the displacement x, the length l, and the swing angle ⁇ feedback affect the horizontal traction force f 1 and along
- the rope traction force f 2 is continuously circulated to adjust the horizontal traction force f 1 and the output value along the rope traction force f 2 , at this time, the bridge crane 2 and the weight are varied according to the horizontal traction force f 1 and the output value along the rope traction force f 2 1
- the equivalent force acting opposite to the horizontal traction force f 1 and the direction along the rope traction force f 2 is respectively applied, thereby realizing the anti-swing positioning control of the overhead crane system.
- the bipolar Sigmoid function can be guided compared to the conventional symbol function.
- the transition is smooth, and the state point within a certain range is quickly attracted to a certain ⁇ neighborhood of the switching plane, and the neighborhood is the boundary layer of the sliding mode switching plane.
- the quasi-sliding mode is not required to be satisfied.
- the condition of the sliding mode is therefore not required to switch the control structure on the switching surface, so that the chattering phenomenon can be fundamentally avoided or weakened.
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Abstract
一种基于一阶动态滑模变结构的桥吊防摆方法,通过分别构建二维桥式吊车系统模型和吊车系统控制模型,将含有摆角动态变化和绳长动态变化的两个滑模面通过微分处理分别得到吊车位置动态滑模面s 1和绳长动态滑模面s 2,并且把二维桥式吊车系统模型中的位移x、长度l和摆角θ与吊车系统控制模型中的吊车位置动态滑模面s 1及绳长动态滑模面s 2进行结合,得到水平牵引力f 1、沿绳牵引力f 2和位移x、长度l、摆角θ之间的关系式,由于位移x、长度l、摆角θ与水平牵引力f 1、沿绳牵引力f 2的一阶导数有关,因此得到在时间上连续的动态滑模控制律,从而实现了对桥式吊车系统的防摆定位控制,并能有效的削弱滑模变结构控制的抖振现象。
Description
本发明涉及桥式起重机技术领域,尤其是一种基于一阶动态滑模变结构的桥吊防摆方法。
桥式起重机系统本质上是一类复杂的欠驱动非线性控制系统,在现代化工业生产中发挥着不可替代的作用,鉴于其较高的理论价值和实用价值,国内外学者从未中断过桥式起重机摇定位控制问题的研究。
目前不少学者尝试将自适应控制、模糊控制以及神经网络与滑模控制结合起来进行优势互补,但所设计出的控制器较复杂、存在抖振、而且大都没有考虑变绳长。而针对变绳长的情况下,也有学者采用过分层滑模、时变滑模控制方法实现对变绳长情况下的桥式吊车防摇定位控制,但其控制率设计步骤比较繁琐且没有考虑到滑模控制所特有的抖振现象。
发明内容
为解决上述问题,本发明的目的在于提供一种基于一阶动态滑模变结构的桥吊防摆方法,能够实现系统的防摆定位控制,并能有效的削弱滑模变结构控制的抖振现象。
本发明解决其问题所采用的技术方案是:
基于一阶动态滑模变结构的桥吊防摆方法,包括以下步骤:S10、实时监测桥式吊车系统的参数,建立二维桥式吊车系统模型,二维桥式吊车系统模型包括重物和用于吊起重物的桥式吊车,重物与桥式吊车之间通过绳索连接;
S20、根据二维桥式吊车系统模型分别求得桥式吊车及重物的位置坐标为:
其中,x
M和y
M分别为桥式吊车的X轴坐标和Y轴坐标,x
m和y
m分别为重物的X轴坐标和Y轴坐标,θ为重物进行摆动时的摆角,l为绳索的长度,x为重物进行摆动时处于水平方向上的位移,位移x、长度l和摆角θ即为需要实时监测的桥式吊车系统的参数;
S30、根据二维桥式吊车系统模型,分别得到位移x、长度l、摆角θ的二阶导数公式为:
其中,M为桥式吊车的质量,f
1为桥式吊车受到的水平牵引力,D为阻力系数,f
2为重物受到的沿绳牵引力,m为重物的质量;
S40、构建与二维桥式吊车系统模型对应的吊车系统控制模型,吊车 系统控制模型之中包括含有摆角动态变化的吊车位置动态滑模面s
1和含有绳长动态变化的绳长动态滑模面s
2,吊车位置动态滑模面s
1和绳长动态滑模面s
2由以下公式进行构建:
其中,x
d为桥式吊车的位移参考值,为一常数;l
d为绳索的绳长参考值,为一常数;a、b、c、d、a
1和b
1均为大于0的常数;
S70、利用积分器分别对水平牵引力f
1和沿绳牵引力f
2的一阶导数进行积分,并结合实时变化的位移x、长度l和摆角θ,循环调整输出水平牵引力f
1和沿绳牵引力f
2;
S80、对桥式吊车及重物分别施加与水平牵引力f
1和沿绳牵引力f
2的方向相反的等值作用力,防止桥式吊车系统进行摆动。
进一步,步骤S30中,根据二维桥式吊车系统模型,分别得到位移x、长度l、摆角θ的二阶导数公式,包括以下步骤:
S31、根据位移x、长度l、摆角θ、水平牵引力f
1和沿绳牵引力f
2,得到二维桥式吊车系统模型的拉格朗日方程为:
S32、根据二维桥式吊车系统模型的拉格朗日方程,得到其非线性动力学微分方程为:
S33、对二维桥式吊车系统模型的非线性动力学微分方程进行形式转换,分别得到位移x、长度l、摆角θ的二阶导数公式。
进一步,步骤S40中,吊车系统控制模型还包括第一线性运算模 块、第一控制器、第二线性运算模块、第二控制器、吊车系统模块、用于输入位移参考值x
d的第一输入模块和用于输入绳长参考值l
d的第二输入模块;第一输入模块、第一线性运算模块、吊车位置动态滑模面s
1、第一控制器和吊车系统模块依次连接,吊车系统模块分别向第一线性运算模块和第一输入模块反馈输出摆角θ和位移x;第二输入模块、第二线性运算模块、绳长动态滑模面s
2、第二控制器和吊车系统模块依次连接,吊车系统模块向第二输入模块反馈输出长度l。
其中,
S62、把位移x、长度l和摆角θ的二阶导数,以及指数趋近律控制法与一介吊车位置动态滑模面
和一介绳长动态滑模面
之间的关系式,分别代入到一介吊车位置动态滑模面
和一介绳长动态滑模面
的公式之中,得到水平牵引力f
1和沿绳牵引力f
2的一阶导数公式。
进一步,步骤S70中,积分器分别设置于第一控制器和第二控制器之中,第一控制器和第二控制器分别向吊车系统模块输出水平牵引力f
1和沿绳牵引力f
2。
本发明的有益效果是:基于一阶动态滑模变结构的桥吊防摆方法,实时监测桥式吊车系统的参数,并据此建立二维桥式吊车系统模型,根据二维桥式吊车系统模型中的相关参数分别建立位移x、长度l和摆角θ的二阶导数公式,接着构建吊车系统控制模型,建立含有摆角动态变化的吊车位置动态滑模面s
1和含有绳长动态变化的绳长动态滑模面s
2,由于吊车位置动态滑模面s
1和绳长动态滑模面s
2的公式之中与位移x、长度l和摆角θ具有关联性,所以根据吊车位置动态滑模面s
1和绳长动态滑模面s
2而得到的水平牵引力f
1和沿绳牵引力f
2也与位移x、长度l和摆角θ具有关联性,所以,当对桥式吊车及重物分别施加与水平牵引力f
1和沿绳牵引力f
2的方向相反的等值作用力,从而对桥式吊车系统进行防摆处理时,位移x、长度l和摆角θ会对应地发生变化,但由于得到的水平牵引力f
1和沿绳牵引力f
2结合实时变化的位移x、长度l和摆角θ,循环调整输出水平牵引力f
1和沿绳牵引力f
2,所以水平牵引力f
1和沿绳牵引力f
2会随着位移x、长度l和摆角 θ的变化而不断调整,从而实现对桥式吊车系统的防摆定位控制;此外,由于在水平牵引力f
1和沿绳牵引力f
2的一阶导数公式中采用了双极性Sigmoid函数代替传统的符号函数,而双极性Sigmoid函数较之传统的符号函数可导,因此能够过渡平滑,在一定范围内的状态点快速被吸引到切换面的某一Δ邻域内,而该邻域则是滑动模态切换面的边界层,在边界层内,准滑动模态不要求满足滑动模态的条件,因此不要求在切换面上进行控制结构的切换,因此能够从根本上避免或削弱了抖振现象。
下面结合附图和实例对本发明作进一步说明。
图1是二维桥式吊车系统模型的示意图;
图2是吊车系统控制模型的示意图。
参照图1-图2,本发明的基于一阶动态滑模变结构的桥吊防摆方法,针对变绳长条件下二维欠驱动桥式起重机的控制问题,将含有摆角动态变化和绳长动态变化的两个滑模面通过微分处理分别得到吊车位置动态滑模面s
1和绳长动态滑模面s
2,由于吊车位置动态滑模面s
1和绳长动态滑模面s
2与吊车系统控制模型的控制输入,即水平牵引力f
1和沿绳牵引力f
2的一阶导数有关,因此得到在时间上连续的动态滑模控制律,从而实现了对桥式吊车系统的防摆定位控制,并能有效的削弱滑模变结构控制的抖振现象。
具体地,首先实时监测桥式吊车系统的参数,并建立二维桥式吊车系统模型,参照图1,桥式吊车2及重物1的位置坐标为:
其中,x
M和y
M分别为桥式吊车2的X轴坐标和Y轴坐标,x
m和y
m分别为重物1的X轴坐标和Y轴坐标,θ为重物1进行摆动时的摆角,l为绳索的长度,x为重物1进行摆动时处于水平方向上的位移,位移x、长度l和摆角θ即为需要实时监测的桥式吊车系统的参数。
接着,根据二维桥式吊车系统模型,可以得到二维桥式吊车系统模型的拉格朗日方程为:
综合以上分析可得到二维桥式吊车系统模型的非线性动力学微分方程为:
将上述非线性动力学微分方程进行形式转换,可以得到位移x、长度l、摆角θ的二阶导数公式为:
其中,M为桥式吊车2的质量,f
1为桥式吊车2受到的水平牵引力,D为阻力系数,f
2为重物1受到的沿绳牵引力,m为重物1的质量。
接着,构建与二维桥式吊车系统模型对应的吊车系统控制模型,该吊车系统控制模型之中包括含有摆角动态变化的吊车位置动态滑模面s
1、含有绳长动态变化的绳长动态滑模面s
2、第一线性运算模块3、第一控制器4、第二线性运算模块5、第二控制器6、吊车系统模块7、用于输入位移参考值x
d的第一输入模块8和用于输入绳长参考值l
d的第二输入模块9;其中,第一输入模块8、第一线性运算模块3、吊车位置动态滑模面s
1、第一控制器4和吊车系统模块7依次连接,吊车系统模块7分别向第一线性运算模块3和第一输入模块8反馈输出摆角θ和位移x;第二输入模块9、第二线性运算模块5、绳长动态滑模面s
2、第二控制器6和吊车系统模块7依次连接,吊车系统模块7向第二输入模块9反馈输出长度l。根据吊车系统控制模型的结构可知,位移x、长度l、摆角θ与水平牵引力f
1、沿绳牵引力f
2之间相互影响,当对桥式吊车2及重物1分别施加与水平牵引力f
1和沿绳牵引力f
2的方向相反的等值作用力,从而对桥式吊车系统进行防摆处理时,位移x、长度l和摆角θ会对应地发生变化,此时,位移x、长度l和摆角θ反馈影响水平牵引力f
1和沿绳牵引力f
2的变化,因此,通过 循环调整输出水平牵引力f
1和沿绳牵引力f
2,从而实现对桥式吊车系统的防摆定位控制。
下面,对位移x、长度l、摆角θ与水平牵引力f
1、沿绳牵引力f
2之间的相互关系进行分析:
吊车位置动态滑模面s
1和绳长动态滑模面s
2由以下公式进行构建:
其中,x
d为桥式吊车2的位移参考值,为一常数;l
d为绳索的绳长参考值,为一常数;a、b、c、d、a
1和b
1均为大于0的常数;
其中,
接着,把位移x、长度l和摆角θ的二阶导数,以及指数趋近律控制法与一介吊车位置动态滑模面
和一介绳长动态滑模面
之间的关系式,分别代入到一介吊车位置动态滑模面
和一介绳长动态滑模面
的公式之中,可以得到水平牵引力f
1和沿绳牵引力f
2的一阶导数公式为:
此时,上式中表明了位移x、长度l、摆角θ与水平牵引力f
1、沿绳牵引力f
2之间的相互影响的关系。由于第一控制器4和第二控制器6之中均设置有积分器,而第一控制器4和第二控制器6分别向吊车系统模块7输出水平牵引力f
1和沿绳牵引力f
2,因此,水平牵引力f
1和沿绳牵引力f
2的一阶导数分别在第一控制器4和第二控制器6之中 进行积分而转换成水平牵引力f
1和沿绳牵引力f
2,接着水平牵引力f
1和沿绳牵引力f
2分别输入到吊车系统模块7之中对位移x、长度l、摆角θ进行改变,此时,位移x、长度l、摆角θ反馈影响水平牵引力f
1和沿绳牵引力f
2,从而不断循环调整水平牵引力f
1和沿绳牵引力f
2的输出值,此时,根据水平牵引力f
1和沿绳牵引力f
2的输出值变化地对桥式吊车2及重物1分别施加与水平牵引力f
1和沿绳牵引力f
2的方向相反的等值作用力,从而实现对桥式吊车系统的防摆定位控制。
另外,由于在水平牵引力f
1和沿绳牵引力f
2的一阶导数公式中采用了双极性Sigmoid函数代替传统的符号函数,而双极性Sigmoid函数较之传统的符号函数可导,因此能够过渡平滑,在一定范围内的状态点快速被吸引到切换面的某一Δ邻域内,而该邻域则是滑动模态切换面的边界层,在边界层内,准滑动模态不要求满足滑动模态的条件,因此不要求在切换面上进行控制结构的切换,因此能够从根本上避免或削弱了抖振现象。
以上是对本发明的较佳实施进行了具体说明,但本发明并不局限于上述实施方式,熟悉本领域的技术人员在不违背本发明精神的前提下还可作出种种的等同变形或替换,这些等同的变形或替换均包含在本申请权利要求所限定的范围内。
Claims (6)
- 基于一阶动态滑模变结构的桥吊防摆方法,其特征在于:包括以下步骤:S10、实时监测桥式吊车系统的参数,建立二维桥式吊车系统模型,所述二维桥式吊车系统模型包括重物(1)和用于吊起所述重物(1)的桥式吊车(2),所述重物(1)与桥式吊车(2)之间通过绳索连接;S20、根据所述二维桥式吊车系统模型分别求得所述桥式吊车(2)及重物(1)的位置坐标为:其中,x M和y M分别为所述桥式吊车(2)的X轴坐标和Y轴坐标,x m和y m分别为所述重物(1)的X轴坐标和Y轴坐标,θ为所述重物(1)进行摆动时的摆角,l为所述绳索的长度,x为所述重物(1)进行摆动时处于水平方向上的位移,所述位移x、长度l和摆角θ即为需要实时监测的桥式吊车系统的参数;S30、根据所述二维桥式吊车系统模型,分别得到位移x、长度l、摆角θ的二阶导数公式为:其中,M为所述桥式吊车(2)的质量,f 1为所述桥式吊车(2)受到的水平牵引力,D为阻力系数,f 2为所述重物(1)受到的沿绳牵引力,m为所述重物(1)的质量;S40、构建与所述二维桥式吊车系统模型对应的吊车系统控制模型,所述吊车系统控制模型之中包括含有摆角动态变化的吊车位置动态滑模面s 1和含有绳长动态变化的绳长动态滑模面s 2,所述吊车位置动态滑模面s 1和绳长动态滑模面s 2由以下公式进行构建:其中,x d为所述桥式吊车(2)的位移参考值,为一常数;l d为所述绳索的绳长参考值,为一常数;a、b、c、d、a 1和b 1均为大于0的常数;S70、利用积分器分别对水平牵引力f 1和沿绳牵引力f 2的一阶导数进行积分,并结合实时变化的位移x、长度l和摆角θ,循环调整输出水平牵引力f 1和沿绳牵引力f 2;S80、对所述桥式吊车(2)及重物(1)分别施加与水平牵引力f 1和沿绳牵引力f 2的方向相反的等值作用力,防止桥式吊车系统进行摆动。
- 根据权利要求1所述的基于一阶动态滑模变结构的桥吊防摆方法,其特征在于:所述步骤S40中,所述吊车系统控制模型还包括第一线性运算模块(3)、第一控制器(4)、第二线性运算模块(5)、第二控制器(6)、吊车系统模块(7)、用于输入位移参考值x d的第一输入模块(8)和用于输入绳长参考值l d的第二输入模块(9);所述第一输入模块(8)、第一线性运算模块(3)、吊车位置动态滑模面s 1、第一控制器(4)和吊车系统模块(7)依次连接,所述吊车系统模块(7)分别向所述第一线性运算模块(3)和第一输入模块(8)反馈输出摆角θ和位移x;所述第二输入模块(9)、第二线性运算模块(5)、绳长动态滑模面s 2、第二控制器(6)和吊车系统模块(7)依次连接, 所述吊车系统模块(7)向所述第二输入模块(9)反馈输出长度l。
- 根据权利要求4所述的基于一阶动态滑模变结构的桥吊防摆方法,其特征在于:所述步骤S60中,把位移x、长度l、摆角θ的二阶导数结合一介吊车位置动态滑模面 和一介绳长动态滑模面 得到水平牵引力f 1和沿绳牵引力f 2的一阶导数公式,包括以下步骤:
- 根据权利要求3所述的基于一阶动态滑模变结构的桥吊防摆方法,其特征在于:所述步骤S70中,所述积分器分别设置于所述第一控制器(4)和第二控制器(6)之中,所述第一控制器(4)和第二控制器(6)分别向所述吊车系统模块(7)输出水平牵引力f 1和沿绳牵引力f 2。
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Also Published As
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DE112018006910T5 (de) | 2020-10-01 |
US20200270103A1 (en) | 2020-08-27 |
US11524878B2 (en) | 2022-12-13 |
CN108303883A (zh) | 2018-07-20 |
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