Testing device and testing control method for windshield wipers on high-speed trains

Abstract

This invention provides a detection device and detection control method for a high-speed train windshield wiper, comprising: establishing a structural model based on the structural characteristic parameters of the high-speed train windshield wiper; determining the location of pressure characteristic points based on the structural model; acquiring aerodynamic parameters of the high-speed train's operating mode; acquiring pressure parameters of the pressure characteristic points based on the aerodynamic parameters of the operating mode and the structural model; and applying pressure to the high-speed train windshield wiper or the structural model based on the pressure parameters to obtain performance parameters of the high-speed train windshield wiper.

Description

Technical Field

[0001] This invention relates to the field of high-speed train equipment technology, and in particular to a detection device and detection control method for high-speed train windshield wipers. Background Technology

[0002] High-speed trains (such as the 350 km / h China Standard EMU) use DC brushed motors for their windshield wipers, operating at DC 110V. The motor drives the wiper arms and blades in a reciprocating motion to clean the windshield. During this process, windshield washer fluid is pumped through hoses integrated into the wiper arms and sprayed onto the windshield via nozzles.

[0003] There are generally four states for windshield wipers: off, intermittent, slow, and fast.

[0004] The current train wiper test bench uses a 1:1 scale model to simulate the original train structure and employs original glass. The bench is equipped with a set of testing fixtures for wiper installation. An industrial computer is located on the internal workbench for writing wiper testing software, storing test data, and generating corresponding test reports. The external test bench is equipped with a water circulation system and corresponding anti-spraying devices to prevent water accumulation in the test area.

[0005] Current windshield wiper reliability test benches are all static test systems. They do not consider the effects of aerodynamics during wiper testing and cannot realistically simulate actual train operation. As train speeds increase, the impact of train aerodynamics on windshield wipers becomes increasingly prominent.

[0006] Although both trains and cars are ground-based vehicles, the performance of car windshield wipers can be tested using a static windshield wiper test bench, while that of train windshield wipers cannot be tested using the same method. The main reason is the significant difference in their operating conditions:

[0007] (1) To improve train operating efficiency and shorten travel time, train speeds are significantly higher than those of automobiles. The maximum speed on my country's highways is generally 120 km / h, at which point the impact of aerodynamics on automobile windshield wiper performance can be disregarded. However, the stable operating speed of trains in my country is typically 350 km / h, at which point the impact of aerodynamics on the performance of high-speed train windshield wipers must be considered.

[0008] (2) When a high-speed train fixed on the track is running on a double track, the aerodynamic characteristics of the windshield wipers must be considered when two trains running in opposite directions meet.

[0009] (3) When high-speed trains pass through tunnels and when two trains meet, the aerodynamic characteristics of the windshield wipers must be taken into account.

[0010] As high-speed trains operate at increasingly higher speeds, understanding and mastering the performance of their windshield wipers during high-speed operation is becoming increasingly urgent. Summary of the Invention

[0011] To address the above technical problems, this invention provides a detection device and detection control method for high-speed train windshield wipers. Based on the operating mode of the high-speed train, the device obtains the pressure parameters of the pressure characteristic points of the wipers, thereby converting the aerodynamic load applied to the wipers in the operating mode into a pressure load applied to the wipers, thus accurately obtaining and testing the performance parameters of the high-speed train windshield wipers.

[0012] One embodiment of the present invention provides a detection and control method for windshield wipers on high-speed trains, comprising:

[0013] A structural model is established based on the structural characteristic parameters of the high-speed train windshield wiper, and the location of pressure characteristic points is determined based on the structural model.

[0014] The dynamic parameters of the high-speed train's operating mode are obtained, and the pressure parameters of the pressure feature points are obtained based on the dynamic parameters of the operating mode and the structural model.

[0015] Pressure is applied to the high-speed train windshield wiper or the structural model based on the pressure parameters to obtain the performance parameters of the high-speed train windshield wiper.

[0016] In one embodiment, obtaining the dynamic parameters of the high-speed train's operating mode, and obtaining the pressure parameters of the pressure feature points based on the dynamic parameters of the operating mode and the structural model, includes:

[0017] The dynamic parameters of a single-vehicle operation mode of a high-speed train are obtained, and the first pressure parameter of the pressure feature point is obtained based on the dynamic parameters of the single-vehicle operation mode and the structural model.

[0018] The dynamic parameters of the high-speed train's road condition operation mode are obtained, and the second pressure parameters of the pressure feature point are obtained based on the dynamic parameters of the road condition operation mode and the structural model.

[0019] Applying pressure to the high-speed train windshield wiper or the structural model based on the pressure parameters includes:

[0020] Pressure is applied to the high-speed train wiper or the structural model based on the first pressure parameter and / or the second pressure parameter to obtain the performance parameters of the high-speed train wiper.

[0021] In one embodiment, obtaining the dynamic parameters of the high-speed train's operating mode, and obtaining the pressure parameters of the pressure feature points based on the dynamic parameters of the operating mode and the structural model, includes:

[0022] Obtain the initial pressure parameters of the pressure feature point when the high-speed train is stationary; and / or

[0023] The structural model further includes an accessory installed on the windshield wiper of the high-speed train, and the accessory is used to obtain the pressure parameters of the pressure feature point when the high-speed train is stationary.

[0024] In one embodiment, obtaining the dynamic parameters of a single-vehicle operation mode of a high-speed train, and obtaining the first pressure parameter of the pressure feature point based on the dynamic parameters of the single-vehicle operation mode and the structural model, includes:

[0025] The first vehicle body vibration parameters of the high-speed train's single-vehicle operation mode are obtained based on the implicit structure of dynamics. The first pressure parameters of the pressure feature points and the first fatigue life of the high-speed train's windshield wipers are obtained based on the first vehicle body vibration parameters, the operating speed, and the structural model.

[0026] The dynamic parameters of a single-vehicle operation mode of a high-speed train are obtained based on the explicit dynamic structure. Based on the dynamic parameters, the operating speed, and the structural model, the first pressure parameter of the pressure characteristic point and the second fatigue life of the high-speed train windshield wiper are obtained.

[0027] In one embodiment, the first vehicle body vibration parameters for obtaining a single-vehicle operation mode of a high-speed train based on the implicit dynamic structure include:

[0028] In the single-vehicle operation mode, the first vibration parameters of the high-speed train under the standard road spectrum condition and the second vibration parameters of the high-speed train under the measured road spectrum condition are obtained.

[0029] In one embodiment, obtaining the dynamic parameters of a single-vehicle operation mode of a high-speed train based on an explicit dynamic structure includes:

[0030] Obtain the second car body vibration parameters of a high-speed train in a single-car operation mode; and

[0031] In the single-vehicle operation mode of the high-speed train, the friction coefficient between the windshield wiper and the windshield assembly of the high-speed train is obtained.

[0032] The friction coefficient mentioned above includes the friction coefficient of the high-speed train windshield wipers in both dry and wet wiping modes.

[0033] In one embodiment, obtaining the dynamic parameters of the high-speed train's road condition operation mode, and obtaining the second pressure parameter of the pressure feature point based on the dynamic parameters of the road condition operation mode and the structural model, includes:

[0034] The aerodynamic parameters of the high-speed train's road condition operation mode are obtained, and the pressure distribution on the outer surface of the high-speed train's windshield wiper and the second pressure parameters of the pressure characteristic points are obtained based on the aerodynamic parameters and the structural model.

[0035] In one embodiment, the road condition operation mode includes one or more of the following: two-vehicle meeting mode, tunnel entry mode, tunnel exit mode, and tunnel passage mode.

[0036] Another embodiment of the present invention provides a detection device for windshield wipers on high-speed trains, comprising:

[0037] High-speed train glass assembly;

[0038] A loading platform is provided adjacent to the high-speed train glass assembly, and a high-speed train windshield wiper is mounted on the loading platform to wipe the surface of the high-speed train glass assembly.

[0039] A pressure loading mechanism, mounted on the loading platform and connected to the wiper arm of the high-speed train windshield wiper, applies pressure to the high-speed train windshield wiper towards the surface of the high-speed train glass assembly; and

[0040] A pressure diaphragm sensor is installed on the wiper arm of the high-speed train windshield wiper.

[0041] The pressure film sensor is installed at the position of the pressure characteristic point determined according to the detection and control method of the high-speed train wiper described above. The pressure loading mechanism applies pressure to the surface of the high-speed train glass assembly towards the wiper according to the detection and control method of the high-speed train wiper described above and in response to the signal of the pressure film sensor.

[0042] In one embodiment, the pressure loading mechanism includes a preload spring connected between the loading platform and the scraper arm, the preload spring forming an angle with the surface of the high-speed train glass assembly inclined upward toward the high-speed train glass assembly.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. Solved the problem that the transmission-grade automotive wiper test device could not simulate the dynamic aerodynamic load generated by the long-term high-speed operation (speed of 350km / h or more) of high-speed trains, which caused fatigue failure and impact instability of the wiper motors and wiper arms of the head and tail cars.

[0045] 2. The windshield wiper pressure data under different train operating conditions (including two trains passing each other, entering and exiting tunnels, and different speed levels) is mainly obtained through simulation calculation. Compared with on-board testing, the cost is lower, the time cycle is shorter, the reusability is better, and the data is comprehensive and accurate. Pressure data of all parts can be repeatedly obtained according to the needs of subsequent tests.

[0046] 3. The designed pneumatic load loading mechanism is low in cost, simple to implement, highly reliable, has good performance in subsequent replacement and maintenance, and has extremely low life cycle cost, making it suitable for long-life reliability testing of windshield wipers. Attached Figure Description

[0047] The following figures are for illustrative purposes only and do not limit the scope of the invention.

[0048] Figure 1 This is a flowchart of the first embodiment of the detection and control method for high-speed train windshield wipers of the present invention.

[0049] Figure 2 This is a flowchart of the second embodiment of the detection and control method for high-speed train windshield wipers of the present invention.

[0050] Figure 3 This is a flowchart of the third embodiment of the detection and control method for high-speed train windshield wipers of the present invention.

[0051] Figure 4 This is a schematic diagram of the detection device for the high-speed train windshield wiper of the present invention.

[0052] Figure 5 This is a partial schematic diagram of the detection device for the high-speed train windshield wiper of the present invention.

[0053] Figure 6 This is a schematic diagram of the pressure loading mechanism of the detection device for the high-speed train windshield wiper of the present invention. Detailed Implementation

[0054] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0055] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0056] To keep the drawings concise, only the parts relevant to the invention are shown in each figure, and do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of the components with the same structure or function is shown schematically, or only one is labeled.

[0057] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0058] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0059] In this document, terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0060] The exemplary embodiments will now be described more fully with reference to the accompanying drawings.

[0061] To address the problems in the prior art, this invention provides a detection device and detection control method for windshield wipers on high-speed trains. Based on the operating mode of the high-speed train, the device obtains the pressure parameters of the pressure characteristic points of the wipers, so as to convert the aerodynamic load loaded on the wipers in the operating mode into the pressure load loaded on the wipers, thereby accurately obtaining and testing the performance parameters of the windshield wipers on high-speed trains.

[0062] Figure 1 This is a flowchart of the first embodiment of the detection and control method for high-speed train windshield wipers of the present invention. Figure 1 As shown, one embodiment of the present invention provides a detection and control method for windshield wipers on high-speed trains, comprising:

[0063] A structural model was established based on the structural characteristic parameters of the windshield wiper of a high-speed train, and the location of pressure characteristic points was determined based on the structural model.

[0064] The dynamic parameters of the high-speed train's operating mode are obtained, and the pressure parameters of pressure characteristic points are obtained based on the dynamic parameters of the operating mode and the structural model.

[0065] Pressure is applied to the windshield wipers or structural models of high-speed trains based on pressure parameters to obtain the performance parameters of the windshield wipers.

[0066] The purpose of this invention is to address the limitations of automotive-grade windshield wiper testing devices in simulating the dynamic aerodynamic loads generated during long-term high-speed train operation (above 350 km / h) on the wiper motors and wiper arms of the lead and tail trains, which can lead to fatigue failure and impact instability. This invention primarily achieves this by simulating the aerodynamic characteristics of high-speed train wipers to determine the pressure between the wiper blade and the windshield under different wind loads and other operating conditions. Furthermore, by designing a loading mechanism, different operating conditions of high-speed train wipers in the laboratory are simulated to complete the development of the test bench and the performance testing of high-speed train wipers. Based on the test data or results, reliability analysis of the wipers is conducted, providing a basis for wiper maintenance and repair.

[0067] The windshield wipers for high-speed trains mainly consist of wiper blades, wiper arms, and mechanical support structures. Structural characteristics may include dimensions, weight, and mechanical structural parameters.

[0068] Specifically, the dynamic parameters of the high-speed train's operating mode are obtained, and the pressure parameters of pressure characteristic points are obtained based on the dynamic parameters of the operating mode and the structural model, including:

[0069] The dynamic parameters of a single-vehicle operation mode of a high-speed train are obtained, and the first pressure parameter of the pressure characteristic point is obtained based on the dynamic parameters and structural model of the single-vehicle operation mode.

[0070] The dynamic parameters of the high-speed train's road condition operation mode are obtained, and the second pressure parameters of the pressure characteristic points are obtained based on the dynamic parameters of the road condition operation mode and the structural model.

[0071] Therefore, the pressure applied to the windshield wipers or structural model of a high-speed train based on pressure parameters includes:

[0072] Pressure is applied to the windshield wiper or structural model of the high-speed train based on the first pressure parameter and / or the second pressure parameter to obtain the performance parameters of the windshield wiper of the high-speed train.

[0073] In single-train operation mode, the high-speed train operates as a single train with no other objects in the opposite direction, and is only subject to air resistance from the surrounding environment. In contrast, road condition operation mode occurs when there are other objects in the opposite direction, such as when another high-speed train passes by or in a tunnel. In this case, the outer surface of the high-speed train is subject to air resistance from both the surrounding environment and the objects in the opposite direction, and it is not simply a combination of the two.

[0074] Furthermore, the dynamic parameters of the high-speed train's operating mode are obtained, and the pressure parameters of pressure characteristic points are obtained based on the dynamic parameters of the operating mode and the structural model, including:

[0075] Obtain the initial pressure parameters of pressure characteristic points when the high-speed train is stationary; and / or

[0076] The structural model further includes an accessory installed on the windshield wiper of the high-speed train, and the accessory pressure parameters of the pressure characteristic points when the high-speed train is stationary are obtained based on the accessory of the structural model.

[0077] Among them, obtaining the dynamic parameters of a single-vehicle operation mode of a high-speed train, and obtaining the first pressure parameter of the pressure feature point based on the dynamic parameters and structural model of the single-vehicle operation mode, includes:

[0078] The first body vibration parameters of a high-speed train in a single-vehicle operation mode are obtained based on the implicit structure of dynamics. The first pressure parameters of pressure characteristic points and the first fatigue life of the high-speed train wipers are obtained based on the first body vibration parameters, operating speed and structural model.

[0079] Based on the explicit structure of dynamics, the dynamic parameters of the single-vehicle operation mode of the high-speed train are obtained. Based on the dynamic parameters, operating speed and structural model, the first pressure parameter of the pressure characteristic point and the second fatigue life of the high-speed train windshield wiper are obtained.

[0080] Direct integration methods are commonly used in finite element dynamics analysis, encompassing two main categories: explicit and implicit solutions. Each method has its advantages and disadvantages. Explicit integration methods essentially derive the motion of nodes at the next time step from the nodal motion equations at the current time step. Their advantage lies in the fact that they do not require the assembly of stiffness, mass, and damping matrices; the right-hand side terms are formed only at the element level by accumulating the contribution of each element to the effective load vector. Thus, the entire calculation is essentially performed at the element level, requiring only a small high-speed storage area, resulting in high computational efficiency. This method is widely used in the wave response analysis of open systems. However, explicit integration methods are only conditionally stable, and the time step used in the calculation is limited by the stability of the integration scheme. Implicit integration methods, on the other hand, have certain advantages in numerical stability. However, implicit integration schemes are spatially coupled, requiring the solution of simultaneous equations at each time step. Therefore, as the number of elements and nodes in the finite element calculation increases, the computational load and the requirements for computer data storage for this integration scheme also increase dramatically.

[0081] Therefore, this embodiment uses two methods to obtain the dynamic parameters of the single-vehicle operation mode of the high-speed train, so as to obtain the static and dynamic parameters of the high-speed train respectively, thereby obtaining more accurate pressure parameters.

[0082] Among them, the first car body vibration parameters for obtaining the single-vehicle operation mode of a high-speed train based on the implicit dynamic structure include:

[0083] In single-vehicle operation mode, the first vibration parameters of the standard road spectrum condition of the high-speed train and the second vibration parameters of the measured road spectrum condition of the high-speed train are obtained.

[0084] Standard road spectrum conditions can be obtained through simulation, while measured road spectrum conditions can be obtained by collecting real-time data.

[0085] In one embodiment, obtaining the dynamic parameters of a single-vehicle operation mode of a high-speed train based on an explicit dynamic structure includes:

[0086] Obtain the second car body vibration parameters of a high-speed train in a single-car operation mode; and

[0087] In the single-vehicle operation mode of the high-speed train, the friction coefficient between the windshield wiper and the windshield assembly of the high-speed train is obtained.

[0088] The coefficient of friction includes the coefficient of friction of the windshield wipers on high-speed trains in dry wiping mode and wet wiping mode.

[0089] Furthermore, the dynamic parameters of the high-speed train's road condition operation mode are obtained, and the second pressure parameters of the pressure characteristic points are obtained based on the dynamic parameters of the road condition operation mode and the structural model, including:

[0090] The aerodynamic parameters of the high-speed train's road condition operation mode are obtained, and the pressure distribution and pressure characteristic points on the outer surface of the high-speed train's windshield wiper are obtained based on the aerodynamic parameters and structural model.

[0091] The road condition operation modes include one or more of the following: two-vehicle intersection mode, tunnel entry mode, tunnel exit mode, and tunnel passage mode.

[0092] In a specific example of the present invention, such as Figure 2 As shown, the detection and control method for high-speed train windshield wipers of the present invention includes:

[0093] Step 1: Simulation of windshield wiper structural strength under various speed conditions

[0094] An airflow field geometric model and a wiper structure geometric model (mainly including the wiper blade, wiper frame, and mechanical support structure) were established. Using air-solid coupling technology, the stress on the wiper under different operating speeds and different wiper swing positions was simulated and calculated. The results mainly include the pressure distribution near the wiper, the stress and deformation data of the wiper, the static stress at different speeds and wiper swing positions, and further quantitative analysis of the force change of the wiper under continuous swing at the same operating speed.

[0095] Step 2: Wiper Spatial Attitude Analysis

[0096] An airflow field geometric model and a wiper structure geometric model (mainly including the wiper blade, wiper frame, and mechanical support structure) were established. Using air-solid coupling technology, the stress on the wiper under different operating speeds and different wiper swing positions was simulated and calculated. The results mainly include the pressure distribution near the wiper, the stress and deformation data of the wiper, the static stress at different speeds and wiper swing positions, and further quantitative analysis of the force change of the wiper under continuous swing at the same operating speed.

[0097] The pressure exerted by the windshield wipers on the windshield includes the following:

[0098] (1) Pre-pressure: When the windshield wipers are installed on the train, the initial pressure of the windshield wipers on the windshield.

[0099] (2) Dynamic Pressure: The actual pressure exerted by the windshield wipers on the windshield when the train is traveling at high speed can be called high-speed dynamic pressure, or simply dynamic pressure. Dynamic pressure is usually greater than preload pressure. This can be understood as the dynamic pressure degenerating into preload pressure when the train is traveling at low speed. In other words, when the train is traveling at low speed, only preload pressure needs to be considered. Currently, the specific value of dynamic pressure needs to be determined by simulations of the dynamic mechanical characteristics of high-speed trains. The simulation results can be used to determine at what train speed condition dynamic pressure needs to be considered.

[0100] (3) Additional pressure: In the laboratory, the windshield wipers may be equipped with accessories such as sensors and their mounting devices, which may result in the windshield wipers exerting pressure on the windshield.

[0101] When conducting tests on a test bench, the effects of pre-pressure, dynamic pressure, and additional pressure on the actual windshield wiper pressure should be clearly defined. This allows the test bench to more realistically simulate the performance of train windshield wipers under high-speed conditions. If necessary, software compensation should be used to eliminate errors introduced by theoretical force calculations.

[0102] Step 3: Quantitative analysis of the impact of windshield wipers on the flow field at the train's front end.

[0103] The flow field in the relevant area of ​​the train head was simulated and calculated to study the quantitative influence of different oscillation positions of the windshield wipers on the flow velocity and pressure distribution under typical operating conditions (speed, etc.), providing a basis for the necessity of gas-solid coupling calculation.

[0104] Step 4: Simulation Analysis of Wiper Blades Under Intersecting Lines

[0105] A gas-solid coupling model for windshield wipers with intersecting lines was established. The stress, strain, and deformation of the windshield wipers under different speeds and swing positions were simulated and calculated. The stress state of the windshield wipers under the condition of intersecting lines was analyzed.

[0106] Step 5: Simulation Analysis of Windshield Wipers under Tunnel Traffic

[0107] A gas-solid coupling model for analyzing windshield wipers under tunnel traffic conditions was established. The stress, strain, and deformation of the windshield wipers under different speeds, when entering the tunnel, traveling inside the tunnel, exiting the tunnel, and at different wiper swing positions were simulated and calculated. The stress state of the windshield wipers under different operating conditions in the tunnel was analyzed.

[0108] Step 6: Simulation Analysis of Windshield Wipers During Intersections Inside Tunnels

[0109] A gas-solid coupling model for analyzing windshield wipers under intersecting conditions inside a tunnel was established. The stress, strain, and deformation of the windshield wipers under different speeds and swing positions were simulated and calculated. The stress conditions of the windshield wipers under different operating conditions were analyzed.

[0110] Step 7: Wiper fatigue life analysis under a typical operating path

[0111] For a specific train set, the operating conditions under its typical operating route are analyzed and decomposed into several specific operating condition combinations mentioned above. Based on the simulation analysis results and the fatigue characteristics of typical wiper materials, fatigue life analysis theory is used to conduct fatigue life simulation analysis on the wiper frame, wiper blade and rotating support of the wiper.

[0112] In another example of the present invention, the detection and control method for the high-speed train windshield wiper of the present invention includes:

[0113] Step 1: Conduct a preliminary assessment of the wiper structure strength according to the conventional structural simulation process in the rail transit industry. This includes static strength structural simulation analysis based on TB1335 or EN12663, modal simulation analysis, half-wave sinusoidal impact simulation analysis based on IEC61373 standard, and random vibration simulation analysis. The reason for conducting the above dynamic vibration simulation analysis is to evaluate whether the current wiper structure strength can meet the 350 standard dynamic vibration fatigue life requirement under the existing standards, and to provide a basis for subsequent assessment of structural failure. Through the above calculations, the structural life and service life of the existing wiper under the standard road spectrum can be obtained.

[0114] Step 2: After completing the above simulation based on the standard spectrum, conduct random vibration simulation based on the measured actual road spectrum of CR400AF to verify the actual vibration state and fatigue life of the wiper structure under the measured road spectrum conditions.

[0115] Step 3: After completing the implicit dynamic structure simulation described above, conduct an actual motion structure simulation of the windshield wiper. Use an explicit structural simulation method to simulate the stress and strain changes over time during the actual cyclic operation of the wiper, effectively assessing the weak points of the wiper during actual operation and providing a basis for subsequent structural optimization. This simulation is divided into two conditions: dry wiping and wet wiping. This simulation may require calculating the wiper's operating state under different rainfall conditions (i.e., multiple friction coefficients between the wiper and the glass).

[0116] Step 4: Based on the CFD simulation analysis report of the external flow field on the outer surface of the train head (calculate the aerodynamic pressure on the surface of the wiper during actual train operation), simulate the pressure distribution of the wiper during the steady-state process, and extract the maximum pressure on the outer surface of the CR400 wiper at different speed levels, providing load basis for subsequent fluid-structure interaction simulation and experimental platform design.

[0117] Step 5: The dynamic maximum pressure and pressure distribution on the outer surface of the windshield wiper are simulated when two vehicles meet and enter or exit the tunnel using the overset method. The pressure load and time-varying curves of several typical points are extracted to provide load basis for subsequent fluid-structure interaction simulation and experimental platform design.

[0118] Step 6: Apply the extracted pressure loads at key points on the outer surface of the wiper to the structural finite element model from Step 1, calculate the structural vibration simulation with surface pressure, and simulate the stress and strain distribution of the wiper after applying aerodynamic loads at different speed levels of the actual vehicle body. This will yield a structural fatigue failure condition consistent with actual working conditions.

[0119] Step 7: Couple the calculated aerodynamic loads under special working conditions such as two vehicles merging and entering and exiting tunnels to the finite element model of the wiper structure in Step 1, and carry out fluid-structure interaction simulation to simulate the actual structural fatigue condition and life of the wiper under special working conditions such as vehicle merging and entering and exiting tunnels.

[0120] like Figures 4 to 6 As shown, the present invention provides a detection device for windshield wipers on high-speed trains, comprising:

[0121] High-speed train glass assembly 1;

[0122] Loading platform 2, adjacent to high-speed train glass assembly 1, high-speed train windshield wiper 3 is installed on loading platform 2 to wipe the surface of high-speed train glass assembly 1;

[0123] A pressure loading mechanism 4 is mounted on the loading platform 2 and connected to the wiper arm of the high-speed train windshield wiper 3 to apply pressure to the surface of the high-speed train glass assembly 1 towards the windshield wiper 3; and

[0124] Pressure diaphragm sensor 5, the pressure diaphragm sensor 5 is installed on the wiper arm of the windshield wiper 3 of the high-speed train;

[0125] The pressure film sensor 5 is installed at the position of the pressure characteristic point determined according to the above detection and control method, and the pressure loading mechanism 4 applies pressure toward the surface of the high-speed train glass assembly 1 to the high-speed train wiper 3 in response to the signal of the pressure film sensor 5 according to the detection and control method of the high-speed train wiper described above.

[0126] Among them, such as Figure 6 As shown, the pressure loading mechanism 4 includes a preload spring connected between the loading platform 2 and the scraper arm. The preload spring forms an angle with the surface of the high-speed train glass assembly 1, tilting upward toward the high-speed train glass assembly 1.

[0127] At the contact point between the wiper arm and the windshield, five pressure film sensors are arranged on each wiper arm (the actual number of force measuring points can be determined according to the length of the wiper). At different wiper angles, based on the mechanical characteristics of the wiper during high-speed train operation, the pressure of the wiper's spatial position on the windshield is obtained through simulation. The force values ​​of the five force measuring points are changed by the spring pressure loading mechanism 4 to achieve experimental simulation of the aerodynamic mechanical characteristics of the wiper.

[0128] When conducting tests on a test bench, the effects of pre-pressure, dynamic pressure, and additional pressure on the actual windshield wiper pressure should be clearly defined. This allows the test bench to more realistically simulate the performance of train windshield wipers under high-speed conditions. If necessary, software compensation should be used to eliminate errors introduced by theoretical force calculations.

[0129] The pressure detection system includes five pressure diaphragms and a control converter, which use the pressure values ​​measured at five fixed points to replace the pressure of the wiper blade on the windshield.

[0130] Specifically, the pressure loading mechanism 4 can be made of a spring with a large k value. When simulating different speed levels in each test, only springs with different k values ​​need to be replaced. In subsequent long-life reliability tests, there is no need to replace the springs and other accessories, which reduces the difficulty of the test and lowers the test cost.

[0131] During installation, the wiper diaphragm is used to lift the wiper arm and attach the pressure diaphragm to the wiper blade. The end of the wiper diaphragm is connected to a control converter, which converts the pressure value into a voltage signal and transmits it to the data acquisition system.

[0132] During simulation, wind pressure data (including the intersection of two vehicles and the entry and exit of tunnels) can be converted into contact pressure between the wiper blade and the windshield. The actual contact pressure can be simulated by adding a pre-tensioning device. This scheme can effectively solve the dynamic pressure conversion problem by simulating aerodynamic loads under different wind speeds and operating conditions.

[0133] Compared with the prior art, the present invention has the following advantages:

[0134] 1. Solved the problem that the transmission-grade automotive wiper test device could not simulate the dynamic aerodynamic load generated by the long-term high-speed operation (speed of 350km / h or more) of high-speed trains, which caused fatigue failure and impact instability of the wiper motors and wiper arms of the head and tail cars.

[0135] 2. The windshield wiper pressure data under different train operating conditions (including two trains passing each other, entering and exiting tunnels, and different speed levels) is mainly obtained through simulation calculation. Compared with on-board testing, the cost is lower, the time cycle is shorter, the reusability is better, and the data is comprehensive and accurate. Pressure data of all parts can be repeatedly obtained according to the needs of subsequent tests.

[0136] 3. The designed pneumatic load loading mechanism is low in cost, simple to implement, highly reliable, has good performance in subsequent replacement and maintenance, and has extremely low life cycle cost, making it suitable for long-life reliability testing of windshield wipers.

[0137] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent implementation schemes or modifications made without departing from the spirit of the present invention, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present invention.

Claims

1. A detection and control method for windshield wipers on high-speed trains, characterized in that, include: A structural model is established based on the structural feature parameters of the high-speed train windshield wiper, and the location of pressure feature points is determined based on the structural model. The structural feature parameters include dimensions, weight, and mechanical structural parameters. The dynamic parameters of the high-speed train's operating mode are obtained, and the pressure parameters of the pressure feature points are obtained based on the dynamic parameters of the operating mode and the structural model. Pressure is applied to the high-speed train wiper or the structural model based on the pressure parameters to obtain the performance parameters of the high-speed train wiper. The process of obtaining dynamic parameters of the high-speed train's operating mode, and obtaining pressure parameters of the pressure feature points based on the dynamic parameters of the operating mode and the structural model, includes: obtaining first vehicle body vibration parameters of the high-speed train's single-vehicle operating mode based on the implicit dynamic structure, and obtaining first pressure parameters of the pressure feature points and first fatigue life of the high-speed train's windshield wipers based on the first vehicle body vibration parameters, operating speed, and the structural model; obtaining dynamic parameters of the high-speed train's single-vehicle operating mode based on the explicit dynamic structure, and obtaining first pressure parameters of the pressure feature points and second fatigue life of the high-speed train's windshield wipers based on the dynamic parameters, operating speed, and the structural model; and obtaining aerodynamic parameters of the high-speed train's road condition operating mode, and obtaining the pressure distribution on the outer surface of the high-speed train's windshield wipers and second pressure parameters of the pressure feature points based on the aerodynamic parameters and the structural model. Pressure is applied to the high-speed train wiper or the structural model based on the first pressure parameter and / or the second pressure parameter to obtain the performance parameters of the high-speed train wiper.

2. The detection and control method for high-speed train windshield wipers according to claim 1, characterized in that, Obtaining the dynamic parameters of the high-speed train's operating mode, and obtaining the pressure parameters of the pressure feature points based on the dynamic parameters of the operating mode and the structural model, includes: Obtain the initial pressure parameters of the pressure feature point when the high-speed train is stationary; and / or The structural model further includes an accessory installed on the windshield wiper of the high-speed train, and the accessory is used to obtain the pressure parameters of the pressure feature point when the high-speed train is stationary.

3. The detection and control method for high-speed train windshield wipers according to claim 1, characterized in that, The first body vibration parameters of a high-speed train's single-vehicle operation mode obtained based on the implicit dynamic structure include: In the single-vehicle operation mode, the first vibration parameters of the high-speed train under the standard road spectrum condition and the second vibration parameters of the high-speed train under the measured road spectrum condition are obtained.

4. The detection and control method for high-speed train windshield wipers according to claim 1, characterized in that, The dynamic parameters of a single-vehicle operation mode of a high-speed train obtained based on the explicit dynamic structure include: Obtain the second car body vibration parameters of a high-speed train in a single-car operation mode; and In the single-vehicle operation mode of the high-speed train, the friction coefficient between the windshield wiper and the windshield assembly of the high-speed train is obtained. The friction coefficient mentioned above includes the friction coefficient of the high-speed train windshield wipers in both dry and wet wiping modes.

5. The detection and control method for high-speed train windshield wipers according to claim 1, characterized in that, The road condition operation modes include one or more of the following: two-vehicle meeting mode, tunnel entry mode, tunnel exit mode, and tunnel passage mode.

6. A detection device for windshield wipers on high-speed trains, characterized in that, include: High-speed train glass assembly (1); Loading platform (2), the loading platform (2) is adjacent to the high-speed train glass assembly (1), and the high-speed train wiper (3) is mounted on the loading platform (2) to wipe the surface of the high-speed train glass assembly (1); Pressure loading mechanism (4), which is installed on the loading platform (2) and connected to the wiper arm of the high-speed train wiper (3) to apply pressure to the surface of the high-speed train glass assembly (1) on the high-speed train wiper (3); and Pressure film sensor (5), the pressure film sensor (5) is installed on the wiper arm of the high-speed train wiper (3); The pressure film sensor (5) is installed in The pressure feature point determined by the detection and control method of the high-speed train wiper according to any one of claims 1 to 5, wherein the pressure loading mechanism (4) applies pressure toward the surface of the high-speed train glass assembly (1) to the high-speed train wiper (3) in response to the signal of the pressure film sensor (5) according to the detection and control method of the high-speed train wiper according to any one of claims 1 to 5.

7. The detection device for high-speed train windshield wipers according to claim 6, characterized in that, The pressure loading mechanism (4) includes a preload spring connected between the loading platform (2) and the scraper arm, the preload spring forming an angle with the surface of the high-speed train glass assembly (1) that is inclined upward toward the high-speed train glass assembly (1).

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