CN114875819A - Novel road surface deceleration strip for municipal works - Google Patents
Novel road surface deceleration strip for municipal works Download PDFInfo
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- CN114875819A CN114875819A CN202210668050.1A CN202210668050A CN114875819A CN 114875819 A CN114875819 A CN 114875819A CN 202210668050 A CN202210668050 A CN 202210668050A CN 114875819 A CN114875819 A CN 114875819A
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- 239000011241 protective layer Substances 0.000 claims abstract description 42
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 37
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 37
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- 239000000230 xanthan gum Substances 0.000 claims abstract description 37
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
- E01F9/529—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users specially adapted for signalling by sound or vibrations, e.g. rumble strips; specially adapted for enforcing reduced speed, e.g. speed bumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a novel road surface deceleration strip for municipal engineering, which comprises: a rubber protective layer, a polymer air bag and a non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer; the radial cross section of the deceleration strip is arc-shaped, the radius of the arc-shaped is r, and the vertical distance between the highest point of the arc-shaped and the bottom edge is d 1 When d is 0.2r ═ d 1 ‑0.3，1cm≤d 1 Less than or equal to 1.5 cm. The thickness of the rubber protective layer is d 2 ，d 1 ＝k×d 2 And k is more than or equal to 3 and less than or equal to 4. The polymer air bag is made of foaming polyurethane. The non-Newtonian fluid deceleration layer is obtained by adding polyethylene glycol 200 into nano silicon dioxide to obtain a shear thickening material, and then mixing the shear thickening material, thickened xanthan gum and lamellar fillers. The invention can effectively improve the compression strength and the tensile strength of the deceleration strip, can promote the non-Newtonian fluid deceleration layer to quickly recover after deformation, and effectively applies to the subsequent vehiclesAnd carrying out deceleration shock absorption.
Description
Technical Field
The invention relates to the technical field of speed bumps, in particular to a novel road surface speed bump for municipal engineering.
Background
The speed reducing belt is also called as a speed reducing ridge, is a traffic facility which is arranged in the center of a road surface and used for reminding or forcing the vehicles in the road to reduce speed, generally takes yellow and black colors at intervals to attract visual attention, and slightly arches the road surface to achieve the aim of reducing the speed of the vehicles. The system is generally arranged on road junctions, industrial and mining enterprises, schools, residential community population and other road sections requiring slow speed reduction of vehicles and road sections easily causing traffic accidents.
The deceleration strip is generally strip-shaped and also has a point shape; the strip-shaped deceleration strip is generally made of rubber, and the dot-shaped deceleration strip is generally made of metal. At present, most of the conventional deceleration strips are made of rubber materials, the deformation of the deceleration strips is small, and even if the deceleration strips pass through the deceleration strips, the deceleration strips cannot influence the life of people around and damage vehicles. If the vehicle passes through the suspension, jolting and noise are generated, so that the shock absorber of the automobile is damaged, the shock to the suspension is large, the suspension is abnormal, the direction deviation can be generated after the suspension is abnormal, and the possibility of damaging a chassis even for the car is generated.
The non-Newtonian fluid material does not satisfy the Newtonian viscosity experiment law, and the shear stress and the shear strain rate of the non-Newtonian fluid material are not in a linear relation. The viscosity of a non-newtonian fluid may change due to the pressure or velocity experienced, with higher pressures and higher velocities, and with higher viscosities, even temporary solids. When a vehicle passes through the speed bump at a higher speed, the characteristics of the non-Newtonian fluid are exposed, and the speed bump becomes hard under certain rigidity, so that the vehicle is forced to decelerate; if passing slowly, the non-Newtonian fluid will deform, smoothing the vehicle. The characteristics of non-newtonian sensitivity to strain rate can be used for differential deceleration of a vehicle.
However, the strength of the non-Newtonian body is low at present, the shear thickening effect of the non-Newtonian body cannot meet the requirement of the speed bump, the speed bump is easily damaged when a vehicle passes through the speed bump, the vibration attenuation of the vehicle is slow, and the damping effect is poor.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a novel road surface deceleration strip for municipal engineering.
The utility model provides a novel road surface deceleration strip for municipal works, includes: a rubber protective layer, a polymer air bag and a non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer; the radial cross section of the deceleration strip is arc-shaped, the radius of the arc-shaped is r, and the vertical distance between the highest point of the arc-shaped and the bottom edge is d 1 When d is 0.2r ═ d 1 -0.3，3.5cm≤r≤6cm，1cm≤d 1 ≤1.5cm。
The height of the speed bump is only 10-15mm, and compared with the original height of 30-50mm, the comfort level is greatly improved.
Preferably, the rubber protective layer has a thickness d 2 ，d 1 ＝k×d 2 ，3≤k≤4。
Preferably, the polymer air bag is made of foaming polyurethane.
Preferably, the non-Newtonian fluid deceleration layer is prepared by adding polyethylene glycol 200 into nano silicon dioxide to obtain a shear thickening material, and then mixing the shear thickening material, thickened xanthan gum and lamellar filler.
The deceleration strip comprises a rubber protective layer, a polymer air bag and a non-Newtonian fluid deceleration layer, wherein the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, the polymer air bag is filled in the rubber protective layer, the necessary deceleration is ensured and the comfort level of an automobile in driving is kept when the automobile drives through the deceleration strip by using the thickening effect of the non-Newtonian fluid deceleration layer under the impact load, and meanwhile, the rubber protective layer and the polymer air bag filled in the rubber protective layer are matched, so that the damage brought by the deceleration strip in the deceleration process can be effectively protected.
Preferably, the thickened xanthan gum is prepared by the following specific steps: adding xanthan gum into ethanol water solution, stirring, adjusting pH value of the system to 9-10, adding 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring at 60-70 deg.C for 1-2h, adding dodecyl glycidyl ether, stirring for 2-4h, separating out product, washing, drying, and pulverizing to obtain thickened xanthan gum.
Introducing quaternary ammonium group, anion-COO on xanthan gum - With a cationic substituent-R 4 N + A reversible network structure is formed through electrostatic interaction, so that the apparent viscosity is enhanced, and then dodecyl glycidyl ether is further added to perform hydrophobic modification on the product.
Preferably, the mass ratio of the xanthan gum to the 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride to the dodecyl glycidyl ether is 1-5: 0.1-1: 0.1-1.
Preferably, the product is precipitated with anhydrous ethanol.
Preferably, the non-Newtonian fluid deceleration layer is prepared by the following specific steps: adding nano silicon dioxide into polyethylene glycol 200, and carrying out ultrasonic treatment for 1-2h to obtain a shear thickening material; and adding a polyacrylamide dispersing agent into the shear thickening material, uniformly stirring, then adding thickened xanthan gum and lamellar filler, and continuously stirring for 1-2h to obtain the non-Newtonian fluid deceleration layer.
Preferably, the mass ratio of the nano silicon dioxide, the polyethylene glycol 200, the polyacrylamide dispersant, the thickened xanthan gum and the lamellar filler is 5-10: 40-60: 1-2: 1-10: 1-10.
Preferably, the lamellar filler is graphene.
In the non-Newtonian fluid deceleration layer, the applicant adds nano silicon dioxide into a polyethylene glycol 200 solution, and the shear thickening material is formed through ultrasonic treatment, and the shear thickening effect is excellent by controlling the proportion of the nano silicon dioxide and the polyethylene glycol 200 solution; adding the thickened xanthan gum into the shear thickening material, wherein the thickened xanthan gum forms a reversible network structure between molecules through electrostatic interaction and hydrophobic association, and the system can be rapidly restored to a balanced state after the shear thickening action disappears, and the next preparation for resisting external impact can be made in time; simultaneously, the thickened xanthan gum is matched with the lamellar filler, so that the compressive strength and the tensile strength of the thickened xanthan gum can be effectively improved, the non-Newtonian fluid deceleration layer can be promoted to be quickly restored after deformation, and effective deceleration and shock absorption can be effectively carried out on subsequent vehicles coming and going.
Compared with a pure shear thickening material, after the xanthan gum is thickened and enhanced, the shear thickening effect is obviously improved, the viscosity peak value at the shear thickening stage is 546Pa s, the viscosity peak value is improved by nearly 60% compared with a pure shear thickening liquid, the automobile vibration energy can be quickly stabilized, and the automobile can be stably passed.
Drawings
Fig. 1 is a schematic structural diagram of a novel road surface deceleration strip for municipal engineering provided by the invention.
FIG. 2 is a graph comparing the rheological properties of the non-Newtonian fluid velocity reduction layer obtained in example 5 and comparative example 2, and the shear thickening material obtained in comparative example 1.
FIG. 3 is a schematic view of a chassis of an unmanned agricultural transportation robot for simulation testing.
Fig. 4 is a comparison graph of the heights of the speed bumps obtained in example 5 and comparative examples 1-2 when the chassis of the unmanned agricultural transportation robot used in the simulation test runs through the speed bumps at different speeds.
FIG. 5 is a graph comparing the effect of the deceleration strips of example 5 and comparative examples 1-2 on the maximum vehicle amplitude after the chassis of the unmanned agricultural transportation robot used in the simulation test drives the deceleration strips at different speeds.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a novel road surface deceleration strip for municipal engineering provided by the invention.
As shown in FIG. 1, a novel road surface deceleration strip for municipal works includes: a rubber protective layer 1, a polymer air bag 2 and a non-Newtonian fluid deceleration layer 3; the rubber protective layer 1 is coated on the outer surface of the non-Newtonian fluid deceleration layer 3, and the macromolecule air bag 2 is filled in the rubber protective layer 1.
The radial cross section of the deceleration strip is arc-shaped, the radius of the arc-shaped is r, and the vertical distance between the highest point of the arc-shaped and the bottom edge is d 1 When d is 0.2r ═ d 1 -0.3，3.5cm≤r≤6cm，1cm≤d 1 Less than or equal to 1.5 cm. The thickness of the rubber protective layer 1 is d 2 ，d 1 ＝k×d 2 ，3≤k≤4。
Example 1
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 10mm, and the radius of the arc is 3.5 cm; the method comprises the following steps: the rubber protective layer with the thickness of 2.5mm, the polymer air bag made of foamed polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by the following specific steps:
adding 1kg of xanthan gum into 5kg of ethanol aqueous solution with the mass fraction of 60%, uniformly stirring, adjusting the pH value of the system to 9-10 by adopting 1mol/L sodium hydroxide solution, stirring for 10min, adding 0.1kg of 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring for 1-2h at the temperature of 60 ℃, adding 0.1kg of dodecyl glycidyl ether, continuously stirring for 2h, separating out a product by adopting absolute ethyl alcohol, washing, drying and crushing to obtain thickened xanthan gum;
adding 5kg of nano silicon dioxide into 40kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1h, wherein the ultrasonic frequency is 20kHz, and the ultrasonic power is 300W, so as to obtain a shear thickening material; adding 1kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 20r/min, then adding 1kg of thickening xanthan gum and 1kg of graphene, and continuously stirring for 1h to obtain the non-Newtonian fluid deceleration layer.
Example 2
A radial section of the novel road surface deceleration strip for municipal engineering is arc-shaped, the height of the deceleration strip is 15mm, and the radius of the arc is 6 cm; the method comprises the following steps: the rubber protective layer with the thickness of 5mm, the high polymer air bag made of foamed polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by the following specific steps:
adding 5kg of xanthan gum into 20kg of 70% ethanol water solution by mass fraction, uniformly stirring, adjusting the pH value of the system to 9-10 by adopting a sodium hydroxide solution with the concentration of 1.2mol/L, stirring for 30min, adding 1kg of 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring for 2h at 70 ℃, adding 1kg of dodecyl glycidyl ether, continuously stirring for 4h, precipitating a product by adopting absolute ethanol, washing, drying and crushing to obtain thickened xanthan gum;
adding 10kg of nano silicon dioxide into 60kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 2h, wherein the ultrasonic frequency is 30kHz, and the ultrasonic power is 400W, so as to obtain a shear thickening material; adding 2kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 50r/min, then adding 10kg of thickening xanthan gum and 10kg of graphene, and continuously stirring for 2h to obtain the non-Newtonian fluid deceleration layer.
Example 3
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 12mm, and the radius of the arc is 4.5 cm; the method comprises the following steps: the rubber protective layer with the thickness of 3.94mm, the polymer air bag made of foaming polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by the following specific steps:
adding 4kg of xanthan gum into 8kg of 66% ethanol aqueous solution by mass fraction, uniformly stirring, adjusting the pH value of the system to 9-10 by adopting 1.05mol/L sodium hydroxide solution, stirring for 25min, adding 0.3kg of 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring for 1.3h at 66 ℃, adding 0.7kg of dodecyl glycidyl ether, continuously stirring for 2.5h, precipitating a product by adopting absolute ethanol, washing, drying and crushing to obtain thickened xanthan gum;
adding 8kg of nano silicon dioxide into 45kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1.7h, wherein the ultrasonic frequency is 22kHz, and the ultrasonic power is 370W, so as to obtain a shear thickening material; adding 1.3kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 40r/min, then adding 3kg of thickening xanthan gum and 8kg of graphene, and continuously stirring for 1.3h to obtain the non-Newtonian fluid deceleration layer.
Example 4
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 14mm, and the radius of the arc is 5.5 cm; the method comprises the following steps: the rubber protective layer with the thickness of 3.79mm, the polymer air bag made of foaming polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by adopting the following specific steps:
adding 2kg of xanthan gum into 16kg of ethanol aqueous solution with the mass fraction of 64%, uniformly stirring, adjusting the pH value of the system to 9-10 by adopting sodium hydroxide solution with the concentration of 1.15mol/L, stirring for 15min, adding 0.7kg of 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring for 1.7h at 64 ℃, adding 0.3kg of dodecyl glycidyl ether, continuously stirring for 3.5h, precipitating a product by adopting absolute ethanol, washing, drying and crushing to obtain thickened xanthan gum;
adding 6kg of nano silicon dioxide into 55kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1.3h, wherein the ultrasonic frequency is 28kHz, and the ultrasonic power is 330W, so as to obtain a shear thickening material; adding 1.7kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 30r/min, then adding 7kg of thickening xanthan gum and 2kg of graphene, and continuously stirring for 1.7h to obtain the non-Newtonian fluid deceleration layer.
Example 5
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 13mm, and the radius of the arc is 5 cm; the method comprises the following steps: the rubber protective layer with the thickness of 3.75mm, the polymer air bag made of foamed polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by the following specific steps:
adding 3kg of xanthan gum into 12kg of 65% ethanol aqueous solution by mass fraction, uniformly stirring, adjusting the pH value of the system to 9-10 by adopting 1.1mol/L sodium hydroxide solution, stirring for 20min, adding 0.5kg of 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring for 1.5h at 65 ℃, adding 0.5kg of dodecyl glycidyl ether, continuously stirring for 3h, separating out a product by adopting absolute ethanol, washing, drying and crushing to obtain thickened xanthan gum;
adding 7kg of nano silicon dioxide into 50kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1.5h, wherein the ultrasonic frequency is 25kHz, and the ultrasonic power is 350W to obtain a shear thickening material; adding 1.5kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 35r/min, then adding 5kg of thickening xanthan gum and 5kg of graphene, and continuously stirring for 1.5h to obtain the non-Newtonian fluid deceleration layer.
Comparative example 1
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 13mm, and the radius of the arc is 5 cm; the method comprises the following steps: a rubber protective layer with the thickness of 3.75mm, a polymer air bag made of foaming polyurethane and a shear thickening layer; the rubber protective layer is coated on the outer surface of the shear thickening layer, and the polymer air bag is filled between the rubber protective layer and the shear thickening layer.
The shear thickening layer is prepared by the following specific steps: adding 7kg of nano silicon dioxide into 50kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1.5h, wherein the ultrasonic frequency is 25kHz, and the ultrasonic power is 350W, so as to obtain the shear thickening layer.
Comparative example 2
A novel road surface deceleration strip for municipal engineering is characterized in that the radial section of the deceleration strip is arc-shaped, the height of the deceleration strip is 13mm, and the radius of the arc is 5 cm; the method comprises the following steps: the rubber protective layer with the thickness of 3.75mm, the polymer air bag made of foamed polyurethane and the non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer.
The non-Newtonian fluid deceleration layer is prepared by the following specific steps: adding 7kg of nano silicon dioxide into 50kg of polyethylene glycol 200, and carrying out ultrasonic treatment for 1.5h, wherein the ultrasonic frequency is 25kHz, and the ultrasonic power is 350W to obtain a shear thickening material; and adding 1.5kg of polyacrylamide dispersant into the shear thickening material, uniformly stirring at the speed of 35r/min, then adding 10kg of graphene, and continuously stirring for 1.5h to obtain the non-Newtonian fluid deceleration layer.
The non-newtonian fluid decelerating layer obtained in example 5 and comparative example 2, and the shear thickening material obtained in comparative example 1 were subjected to rheological property tests as follows:
the test was carried out using an Aton-PaarMCR301 rheometer using a cone-plate (cone-plate) with a diameter of 25mm, an angle of 2 ℃ and a temperature of 25 ℃. To eliminate loading effects, 60s 1s is applied before data acquisition -1 Pre-shearing.
As shown in fig. 2, the viscosity of the non-newtonian fluid deceleration layer obtained in example 5 was the highest at the same shear rate, and the peak value was 546Pa · s, which was more than 60% higher than the viscosity peak of the pure shear thickening material obtained in comparative example 1.
The applicant believes that: the shear thickening material is formed by adding the nano silicon dioxide into the polyethylene glycol 200 solution and carrying out ultrasonic treatment, and the shear thickening material has excellent shear thickening effect by controlling the proportion of the nano silicon dioxide to the polyethylene glycol 200 solution; the thickened xanthan gum is added into the shear thickening material, and forms a reversible network structure between molecules through electrostatic interaction and hydrophobic association, so that the shear thickening effect is effectively enhanced; meanwhile, the shear thickening phenomenon is caused by the formation of particle clusters due to the hydrodynamic lubrication force among the nano particles, the graphene can be equivalent to a plate shape along with the increase of the shear rate, the hydrodynamic lubrication force exists among the silicon dioxide nano particles, among the silicon dioxide nano particles and the graphene, and among the graphene, and the viscosity of the shear thickening fluid is obviously improved under the combined action of the three lubrication forces.
A simulation test was performed using an unmanned agricultural transport robot chassis (shown in fig. 3) from robotic company, zhejiang to simulate the behavior of a vehicle when traversing the speed bump of example 5 and comparative examples 1-2. The total weight of the vehicle was 20kg, the wheel base was 1.0m, and the tire diameter was 40 cm. The frame is a rigid body, and the tire material is rubber. The frame and the wheels are connected by springs, the friction coefficient between the tires and the ground is 0.823, the motor drives the bearing with constant power to enable the frame to drive through each group of deceleration strips at different speeds, a height sensor is arranged at the gravity center position of the frame, and the amplitude of the frame is recorded immediately after the frame passes through each group of deceleration strips.
As shown in fig. 4, when the vehicle speed is less than 10km/h, each set of deceleration strips shows flow characteristics, so that the vehicle can smoothly pass through, but the flow characteristics are increasingly poor as the vehicle speed is increased; when the vehicle speed is more than or equal to 15km/h, each group of deceleration strips shows the solidification characteristic, so that the vehicle cannot pass through stably, and the deceleration effect is forced to be achieved. Through comparison of each group, the following results are found: the speed bump obtained in the embodiment 5 can well control the speed of the vehicle, when the speed of the vehicle is less than 15km/h, the vehicle can stably pass through the speed bump, and when the speed of the vehicle is more than or equal to 15km/h, the speed bump can be effectively forced to achieve the speed reduction effect.
The frame amplitude data collected by the height sensor is processed, and a maximum frame amplitude drawing curve at a certain speed is selected, as shown in fig. 5. When the vehicle speed is less than 14km/h, the maximum amplitude of the vehicle frame of each group is in a slow rising trend, and when the vehicle speed is less than or equal to 14km/h and less than 17km/h, the maximum amplitude of the vehicle frame of each group is greatly increased, but when the vehicle speed is more than or equal to 17km/h, the maximum amplitude of the vehicle frame of each group is in a smooth trend. Comparing the curves of the groups to find that: the deceleration strip obtained in the embodiment 5 has the smallest influence on the amplitude of the low-speed vehicle, and the vehicle amplitude is more and more influenced as the speed of the vehicle is increased, so that the vehicle can be effectively forced to decelerate.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a novel road surface deceleration strip for municipal works which characterized in that includes: a rubber protective layer, a polymer air bag and a non-Newtonian fluid deceleration layer; the rubber protective layer is coated on the outer surface of the non-Newtonian fluid deceleration layer, and the polymer air bag is filled in the rubber protective layer;
the radial cross section of the deceleration strip is arc-shaped, the radius of the arc-shaped is r, and the vertical distance between the highest point of the arc-shaped and the bottom edge is d 1 When d is 0.2r ═ d 1 -0.3，1cm≤d 1 ≤1.5cm。
2. The novel road surface deceleration strip for municipal engineering according to claim 1, characterized in that the thickness of the rubber protective layer is d 2 ，d 1 ＝k×d 2 ，3≤k≤4。
3. The novel road surface deceleration strip for municipal engineering according to claim 1, characterized in that the polymer air bags are made of foamed polyurethane.
4. The novel municipal engineering road surface deceleration strip according to claim 1, wherein the non-Newtonian fluid deceleration layer is prepared by adding polyethylene glycol 200 to nanosilicon dioxide to obtain a shear thickening material, and mixing the shear thickening material with thickened xanthan gum and lamellar fillers.
5. The novel municipal engineering road surface deceleration strip according to claim 4, wherein the thickened xanthan gum is prepared by the following steps: adding xanthan gum into ethanol water solution, stirring, adjusting pH value of the system to 9-10, adding 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, stirring at 60-70 deg.C for 1-2h, adding dodecyl glycidyl ether, stirring for 2-4h, separating out product, washing, drying, and pulverizing to obtain thickened xanthan gum.
6. The novel municipal engineering road surface deceleration strip according to claim 5, wherein the mass ratio of xanthan gum, 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride and dodecyl glycidyl ether is 1-5: 0.1-1: 0.1-1.
7. The novel road surface deceleration strip for municipal engineering according to claim 5, characterized in that absolute ethanol is used to precipitate the product.
8. The novel municipal engineering road surface deceleration strip according to claim 4, wherein the non-Newtonian fluid deceleration layer is prepared by the following specific steps: adding nano silicon dioxide into polyethylene glycol 200, and carrying out ultrasonic treatment for 1-2h to obtain a shear thickening material; and adding a polyacrylamide dispersing agent into the shear thickening material, uniformly stirring, then adding thickened xanthan gum and lamellar filler, and continuously stirring for 1-2h to obtain the non-Newtonian fluid deceleration layer.
9. The novel road surface deceleration strip for municipal engineering according to claim 8, characterized in that the mass ratio of nanosilicon dioxide, polyethylene glycol 200, polyacrylamide dispersant, thickened xanthan gum, lamellar filler is 5-10: 40-60: 1-2: 1-10: 1-10.
10. The novel road surface deceleration strip for municipal engineering according to claim 8, characterized in that the lamellar filler is graphene.
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Application publication date: 20220809 |