32results about How to "Ensure driving safety performance" patented technology

The invention belongs to the technical field of road engineering, and discloses a micro asphalt macadam crack dissipation layer based on vibrating compaction and a compaction method thereof. The micro asphalt macadam crack dissipation layer based on vibrating compaction is characterized by comprising the following raw materials: limestone as mineral aggregate of the micro asphalt macadam crack dissipation layer, and asphalt as a binder for the micro asphalt macadam crack dissipation layer, wherein the asphalt-aggregate ratio is 1.4-2.6%; the mineral aggregate gradation of the micro asphalt macadam crack dissipation layer is as follows: the aggregate of which the particle size is smaller than 26.5mm accounts for 100% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 16mm accounts for 75-95% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 9.5mm accounts for 48-64% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 4.75mm accounts for 30-38% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 2.36mm accounts for 14-24% of total mass of the graded aggregate; the aggregate of which the particle size is smaller than 0.6mm accounts for 5-15% of total mass of the graded aggregate; and the aggregate of which the particle size is smaller than 0.075mm accounts for 0-5% of total mass of the graded aggregate.

The invention relates to a polyurethane / silicate composite material for rapidly repairing concrete pavement pit and a preparation method thereof. The composite material consists of a component A, a component B and a component C. The preparation method comprises the steps that the component A and the component B are rapidly and uniformly stirred according to the mass ratio of 1 to 1, and the component C is added and further uniformly stirred to obtain the polyurethane / silicate composite material. The uniformly stirred materials are timely poured and paved into the concrete pavement pit and slicked, and the surface is paved with fine sand to solidify and have transport service after 120min. The composite material has favorable cohesiveness with the original pavement fracture surface, and the solidified product has favorable rigidity, toughness, abrasive resistance, pressing resistance, fatigue resistance, skid resistance and energy absorption and noise reduction, so that the driving safety of vehicles is ensured, the purpose of rapidly repairing the pavement is achieved, and the time of blocking off traffic is reduced. The polyurethane / silicate composite material can be widely applied to rapid repairing of concrete buildings in the fields of municipal administration pavement, expressway and concrete playground and airports, and can be applied to filling and rapid maintenance of bridge flexible gaps.

The invention discloses a composite material rail side signal equipment ground hardening device. The hardening device comprises an upper plane and a side slope surrounding table, wherein the upper plane is arranged on the side slope surrounding table, and the side slope surrounding table is fixed on a side slope; and when rail side signal equipment is installed on the side slope, the side slope surrounding table needs to be installed, when the rail side signal equipment is installed on a flat surface, the side slope surrounding table does not need to be installed, and the upper plane can be directly installed. According to the ground hardening device and an installation method thereof, the ground hardening device is less in installation personnel, high in efficiency, low in comprehensive cost, resistant to acid and alkali corrosion, good in insulation performance, strong in ultraviolet resistance, capable of being repeatedly disassembled and used, and free of maintenance for a long time.

The invention discloses a composite board which comprises two skin layers, wherein an intermediate layer is formed between the two skin layers and an inner stiffening beam is arranged between the two skin layers, a core material is filled in the intermediate layer, an outer stiffening beam is arranged between the core material and at least one skin layer, and a polydicyclopentadiene layer is arranged outside the at least one skin layer. The invention also discloses a preparation method of the composite board. The invention further discloses a dumper compartment comprising the composite board. The dumper compartment has the characteristics of strong bearing capacity, remarkable weight reducing effect, oil consumption saving, carbon dioxide emission reducing, long service life and the like.

The invention relates to an ultrasonic phased array automatic flaw detector for railway vehicle axles. A die set cross beam is arranged above a lathe bed main body; the die set cross beam is provided with two follow-up devices which can transversely move and are oppositely arranged; the follow-up devices are respectively located at two ends of the inner side of a to-be-detected axle; a phased array is arranged below each follow-up device; two sides of the lathe bed main body are respectively provided with an alignment device capable of vertically moving; an A-type probe is arranged at one end of each alignment device, and can transversely move through the corresponding alignment device; the middle part of the lathe bed main body is provided with an axle rotating mechanism; the lathe bed main body is also provided with a feeding and blanking mechanism, and the feeding and blanking mechanism is used for axle feeding and blanking; the A-type probes and the phased array probes are connected with the phased array ultrasonic flaw detector. According to the ultrasonic phased array automatic flaw detector for the railway vehicle axles, disclosed by the invention, three-dimensional display can be performed on flaws; meanwhile, by adopting cross scanning of the phased array flaw detection and A-type probe flaw detection, the detection efficiency and the detection accuracy are high, the production cost is low, and the application prospect is wide.

The invention relates to a control method of a wheel hub motor driven car based on a self-regulating particle model. The self-regulating particle model is established according to vehicle dynamics. The control method is suitable for linear and nonlinear region of the vehicles. In particularly, the control method provides a moderate vehicle motion state reference value under the road adhesion limit to ensure the handling stability and the driving safety of the vehicles. The establishment of the self-regulating particle model comprises the following steps: 1. According to the neutral veering feature of the vehicle dynamics, the variation of the vehicles ideal reference lateral acceleration is received after the analysis of a two-degree-of-freedom linear reference model. 2. When the vehicles have both a longitudinal acceleration and the lateral acceleration requirements, the corresponding mapping function MAP relationship is established as an ideal resultant acceleration from a reference resultant acceleration by the construction in a G-G acceleration friction circle. 3. Through the transition of coordinate systems between the vehicles movement locus and the vehicles centroid, the vehicles ideal reference motion state value is required. The control method of the wheel hub motor driven car based on the self-regulating particle model ensures the handling stability and the active safety of the vehicles under the road adhesion limit and also guarantees the controllability of the vehicles to the drivers.

The invention provides a rapid construction method for an over-wet soil roadbed. According to the natural water content, the compaction control water content, the seepage coefficient and the air inflow value of over-wet soil filling, the wind speed and the wind temperature are determined. Through rapid dehumidification equipment, the local environment of over-wet soil of a loose laid layer is effectively improved, the air temperature and the relative humidity of the local environment exceed the air inflow value of roadbed filling, meanwhile, the forward and reverse rotation stirring effect of an overturning and stirring wheel is adopted for assistance, and therefore the water content of the over-wet soil filling is rapidly reduced to the compaction control water content of over-wet soil. By the adoption of the method, the roadbed compaction quality is stable and reliable, the roadbed disease happening time is greatly delayed, and the use efficiency of a road surface is effectively improved; the technical problem that it is difficult to ted the over-wet soil within the set time to reach the compaction control water content under the rainy climate condition in South China due to the fact that the over-wet soil is high in water content is solved, the use rate of the over-wet soil is greatly increased, the construction efficiency of the over-wet soil is greatly improved, a construction period is shortened, and the manufacturing cost is saved; and the technological cost is low, the roadbed quality is good, and economic benefits are remarkable.

The invention discloses a smart monitoring system for vehicle gas cylinders of liquefied natural gas vehicles, which includes a vehicle gas cylinder data collection sheet, a vehicle gas cylinder data collection and transmission terminal, a cloud server, and a monitoring platform; the vehicle gas cylinder data collection unit uses To collect the relevant data of LNG vehicle gas cylinders and output them to the vehicle gas cylinder data collection and transmission terminal; the vehicle gas cylinder data collection and transmission terminal is used to send the relevant data of the LNG vehicle gas cylinders to The cloud server; the monitoring platform is used to obtain data from the cloud server to monitor the gas cylinders of LNG vehicles. The invention can effectively monitor the whole state information of the gas cylinder used in the liquefied natural gas vehicle during use, is safe and reliable, convenient in application, accurate in monitoring, and ensures the safety of use and driving.