Reliability bench test control method for integrated frame of double-steel-wheel road roller

Abstract

The invention discloses a double-steel-wheel road roller integrated frame reliability bench test control method, which belongs to the technical field of double-steel-wheel road roller frame testing, and comprises the following steps: obtaining analogue simulation load data under a double-large vibration working condition based on analogue simulation calculation; inputting a set load spectrum program into a control system of the electro-hydraulic servo actuator so as to apply a cyclic load spectrum to the integrated frame; gradually lifting the cyclic load spectrum to a target load level, recording a dynamic strain time history, a displacement change and an acceleration response of a key measuring point in the endurance test process, and performing online damage monitoring to obtain a periodic damage detection record; and finally evaluating the fatigue damage, the durability limit and the structural reliability of the integrated frame by combining a fatigue damage accumulation theory. The method is good in universality and adaptability, can simulate the frame vibration load spectrum based on the cooperation of the front / rear double actuators and the single shaft, reproduces the vibration compaction working conditions of the front and rear double steel wheels of the road roller in the time domain, and achieves process prediction and optimization.

Description

Technical Field

[0001] This invention relates to a bench test control method for the reliability of an integrated frame of a double-drum road roller, belonging to the technical field of double-drum road roller frame testing. Background Technology

[0002] With the nation's accelerated focus on the transformation and upgrading of the manufacturing industry and the high-quality development of key industrial chains, integrated molding technology has become a research hotspot in the manufacturing sector. Integrated molding, through integrated design and manufacturing, achieves near-net-shape forming of the entire part in a single process, and has been initially applied in industries such as automotive and electronics. In the construction machinery industry, the small-batch customized production model is particularly well-suited to the technical characteristics of integrated molding. Integrated molding of double-drum road roller frames based on sand gravity casting can effectively simplify the manufacturing process, improve production efficiency, and enhance forming accuracy, showing broad development prospects. However, the large outline and complex structure of integrated molding frames for construction machinery present a significant challenge to reliability assessment and testing.

[0003] In existing technologies, conventional testing methods for double-drum roller frames are based on vibration tests or roller break-in test benches to fully simulate road conditions. Both methods require the construction of specific platforms, resulting in high testing costs. Furthermore, the former is cumbersome, requiring the preparation of numerous tooling fixtures and multiple installations; the latter requires full vehicle installation verification and cannot simulate dual-vibration conditions. Existing technologies have the following shortcomings: 1. A gap in the field: Existing patent portfolios are highly concentrated in the automotive industry (e.g., rear suspension, subframes). Currently, patents related to bench testing of frames in the construction machinery field mainly involve mixer trucks, agricultural machinery chassis, general engineering vehicle frames, or transmission systems. There is a particular gap in reliability testing devices and methods for double-drum roller frames. This is mainly due to the complex structure of double-drum roller frames and their different stress patterns compared to traditional truck frames or simple beam structures. Additionally, compared to the huge market and stringent regulations of the automotive industry, the road machinery field, including rollers, is relatively segmented, resulting in relatively lagging testing technologies. 2. Poor equipment versatility and adaptability: While existing test benches (such as CN202411401517.1) mention modularity, they are typically designed for specific vehicle models and lack versatility. This is mainly due to rigid tooling design; traditional test benches have fixed fixture and actuator mounting points, making it difficult to quickly and easily adapt to products of different tonnages. Furthermore, the lack of a modular concept means that platform and serialization requirements were not considered in the initial design phase, leading to the need for redesign when developing new products. 3. Lagging evaluation system, unable to achieve process prediction and optimization: Traditional reliability testing mainly relies on post-test macroscopic inspection (such as visual crack detection and flaw detection) to determine failure, which is a post-event evaluation and cannot achieve real-time monitoring during the testing process. This is mainly due to insufficient data utilization, resulting in isolated testing and evaluation processes, making online monitoring and early warning during the testing process impossible. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a bench test control method for the reliability of an integrated steel wheel roller frame. This method has good versatility and adaptability, and can simulate the vibration load spectrum of the frame based on the coordinated single-axle loading of the front / rear dual actuators. It can reproduce the vibration compaction condition of the front and rear dual steel wheels of the roller in the time domain, and realize process prediction and optimization.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A bench test control method for the reliability of an integrated chassis of a double-drum road roller, based on a bench test device, the bench test device including an integrated chassis, the integrated chassis including a front chassis and a rear chassis, the front chassis and the rear chassis being connected by a hinge device, the front chassis and the rear chassis being connected to a bench platform via a front electro-hydraulic servo actuator and a rear electro-hydraulic servo actuator respectively, the test control method including the following steps:

[0007] Based on the load-bearing conditions of various parts of the integrated frame, simulation load data under the dual large vibration condition is obtained through simulation calculation.

[0008] Based on the simulated load data, the set load spectrum programming is input into the control system of the electro-hydraulic servo actuator to enable at least one electro-hydraulic servo actuator to apply a cyclic load spectrum to the integrated frame.

[0009] The cyclic load spectrum was gradually increased to the target load level using a graded loading method, and the target load level was maintained for durability testing. The dynamic strain time history, displacement change and acceleration response of key measuring points on the integrated frame were recorded during the durability test, and periodic damage detection records were obtained by online damage monitoring.

[0010] Based on dynamic strain time history, displacement change and acceleration response, and periodic damage detection records, combined with fatigue damage accumulation theory, the fatigue damage, durability limit and structural reliability of the integrated frame are finally evaluated.

[0011] Before the electro-hydraulic servo actuator applies a cyclic load spectrum to the integrated frame, the spatial orientation of the integrated frame is controlled and adjusted so that the longitudinal symmetry plane of the integrated frame coincides with the central axis of the test platform, and the hinge center of the front frame and the rear frame is coplanar with the force application axis of the electro-hydraulic servo actuator.

[0012] The control and adjustment of the spatial pose of the integrated frame includes: first, adjusting the spatial pose of the integrated frame through the attitude adjustment system of the electro-hydraulic servo actuator; then, using a laser total station to perform precise spatial six-degree-of-freedom measurement to fine-tune the spatial pose of the integrated frame.

[0013] Before applying the cyclic load spectrum to the integrated frame, a sweep frequency preload is applied to the integrated frame to identify the main natural frequencies, damping ratios, and mode shapes of the integrated frame, and the excitation frequency of the cyclic load spectrum is adjusted according to the main natural frequencies, damping ratios, and mode shapes.

[0014] The determination of the key measuring points includes: identifying high-stress areas and potential stress concentration points on the integrated frame based on simulation, and then planning the key stress / strain measuring points on the integrated frame; the dynamic strain time history, displacement change and acceleration response are obtained by strain sensing units, laser displacement sensors and triaxial ICP accelerometers set on the key measuring points, respectively.

[0015] The dual large vibration conditions include:

[0016] Operating condition 1: Excitation force amplitude 80 kN, vibration frequency 45 Hz;

[0017] Operating Condition 2: Excitation force amplitude 50 kN, vibration frequency 60 Hz;

[0018] Operating Condition 3: Operating Condition 1 and Operating Condition 2 are carried out alternately in a certain time sequence, with static loads inserted in between.

[0019] The front frame is connected to a left front frame plate and a right front frame plate, which are connected by a front frame transverse fixing plate. The rear frame is connected to a left rear frame plate and a right rear frame plate, which are connected by a rear frame transverse fixing plate. The front frame transverse fixing plate and the rear frame transverse fixing plate are respectively connected to the test platform via a front electro-hydraulic servo actuator and a rear electro-hydraulic servo actuator.

[0020] The front frame is provided with a left vibration side guard plate and a right vibration side guard plate. The left vibration side guard plate is connected to the left side plate of the front frame, and the right vibration side guard plate is connected to the right side plate of the front frame through threaded holes. The rear frame is provided with a left vibration side guard plate and a right vibration side guard plate. The left vibration side guard plate is connected to the left side plate of the rear frame, and the right vibration side guard plate is connected to the right side plate of the rear frame through threaded holes.

[0021] The left and right sides of the front frame are connected to the transverse fixing plate of the front frame via threaded holes, and the left and right sides of the rear frame are connected to the transverse fixing plate of the rear frame via threaded holes.

[0022] A front connecting seat is provided at the center of the transverse fixing plate of the front frame, and the connecting seat is connected to the front electro-hydraulic servo actuator. A rear connecting seat is provided at the center of the transverse fixing plate of the rear frame, and the rear connecting seat is connected to the rear electro-hydraulic servo actuator.

[0023] The beneficial effects of this invention are as follows: This invention provides a bench test control method for the reliability of an integrated steel wheel roller frame. The front and rear frames of the integrated frame are connected by a hinge device. The front and rear frames are connected to the test platform via front and rear electro-hydraulic servo actuators, respectively. This method can adapt to integrated frames with different structures, exhibiting good versatility and adaptability. Based on simulated load data, a set load spectrum is programmed into the control system of the electro-hydraulic servo actuators to apply a cyclic load spectrum to the integrated frame using at least one electro-hydraulic servo actuator. The cyclic load spectrum is gradually increased to the target load level using a graded loading method and maintained at the target load level for durability testing. The dynamic strain time history, displacement change, and acceleration response of key measuring points on the integrated frame are recorded during the durability test, as well as periodic damage detection records obtained through online damage monitoring. Based on the simulated frame vibration load spectrum of front / rear dual actuators coordinating single-axle loading, the vibration compaction conditions of the front and rear double steel wheels of the roller can be reproduced in the time domain, achieving process prediction and optimization. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an integrated steel wheel roller frame reliability test bench device according to the present invention;

[0025] Figure 2 This is a schematic diagram of the integrated frame of the double-drum road roller in this invention;

[0026] Figure 3 This is a schematic diagram of the transverse fixing plate in the platform fixture of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the left and right side plates of the front frame in the tooling of the present invention;

[0028] The reference numerals in the diagram are as follows: 1-Integrated front frame, 2-Integrated rear frame, 3-Articulation device, 4-Frame platform, 5-Left side plate of the front frame, 6-Right side plate of the front frame, 7-Transverse fixing plate of the front frame, 8-Left side plate of the rear frame, 9-Right side plate of the rear frame, 10-Transverse fixing plate of the rear frame; 101-Left vibration side guard plate of the front frame, 102-Right vibration side guard plate of the front frame; 201-Left vibration side guard plate of the rear frame; 202-Right vibration side guard plate of the rear frame; 701-Transverse fixing plate connecting seat of the front frame; 1001-Transverse fixing plate connecting seat of the rear frame. Detailed Implementation

[0029] Example 1

[0030] This invention discloses a bench test control method for the reliability of an integrated frame of a double-drum road roller, based on a bench test device, such as... Figure 1As shown, the bench test apparatus includes an integrated frame, which comprises a front frame 1 and a rear frame 2. The front frame 1 and the rear frame 2 are connected by a hinge device 3. The front frame 1 and the rear frame 2 are respectively connected to the bench platform 4 via a front electro-hydraulic servo actuator and a rear electro-hydraulic servo actuator. The test control method includes the following steps:

[0031] Step 1: Based on the load-bearing conditions of each part of the integrated frame, simulated load data under the dual large vibration condition is obtained through simulation calculation.

[0032] Step 2: Based on the simulated load data, input the set load spectrum programming into the control system of the electro-hydraulic servo actuator to enable at least one electro-hydraulic servo actuator to apply a cyclic load spectrum to the integrated frame.

[0033] Step 3: Gradually increase the cyclic load spectrum to the target load level using a graded loading method, and maintain the target load level for durability testing. Record the dynamic strain time history, displacement change and acceleration response of key measuring points on the integrated frame during the durability test, as well as obtain periodic damage detection records by online damage monitoring.

[0034] Step four: Based on the dynamic strain time history, displacement change and acceleration response and periodic damage detection records, combined with the fatigue damage accumulation theory, a final assessment of the fatigue damage, durability limit and structural reliability of the integrated frame is conducted.

[0035] In this invention, the front and rear frames of the integrated chassis are connected by a hinge device. The front and rear frames are connected to the test platform via front and rear electro-hydraulic servo actuators, respectively. This allows for the adaptation of integrated chassis with different structures, providing good versatility and adaptability. Based on simulated load data, a set load spectrum is programmed into the control system of the electro-hydraulic servo actuators to apply a cyclic load spectrum to the integrated chassis via at least one electro-hydraulic servo actuator. The cyclic load spectrum is gradually increased to the target load level using a graded loading method and maintained at the target load level for durability testing. The dynamic strain time history, displacement change, and acceleration response of key measuring points on the integrated chassis are recorded during the durability test, as well as periodic damage detection records obtained through online damage monitoring. Based on the simulated chassis vibration load spectrum of front / rear dual actuators coordinating single-axle loading, the vibration compaction conditions of the front and rear double steel wheels of the road roller can be reproduced in the time domain, achieving process prediction and optimization.

[0036] Example 2

[0037] This invention discloses a bench test device for the reliability of an integrated steel wheel roller frame, such as... Figure 1As shown, the bench test device includes an integrated frame, which includes a front frame 1 and a rear frame 2. The front frame 1 and the rear frame 2 are connected by a hinge device 3, which constrains the relative displacement between the front and rear integrated frames, forming an integrated frame assembly that is horizontally placed on the bench platform 4.

[0038] The front frame 1 is connected to a left front frame plate 5 and a right front frame plate 6, which are connected by a front frame transverse fixing plate 7, forming a single unit. The rear frame 2 is connected to a left rear frame plate 8 and a right rear frame plate 9, which are connected by a rear frame transverse fixing plate 10. The front frame transverse fixing plate 7 and the rear frame transverse fixing plate 10 are connected to the platform 4 via front and rear electro-hydraulic servo actuators, respectively. The front frame left side plate 5 and the front frame right side plate 6 have identical structures, as do the rear frame left side plate 8 and the rear frame right side plate 9, forming a mirror image. The front frame transverse fixing plate 7 and the rear frame transverse fixing plate 10 also have identical structures.

[0039] like Figure 2 As shown, the front frame 1 is provided with a left vibration side guard plate 101 and a right vibration side guard plate 102. The left vibration side guard plate 101 and the left side plate 5 of the front frame, and the right vibration side guard plate 102 and the right side plate 6 of the front frame are respectively connected by threaded holes. The rear frame 2 is provided with a left vibration side guard plate 201 and a right vibration side guard plate 202. The left vibration side guard plate 201 and the left side plate 8 of the rear frame, and the right vibration side guard plate 202 and the right side plate 9 of the rear frame are respectively connected by threaded holes.

[0040] like Figure 4As shown, the left side plate 5 and the right side plate 6 of the front frame are provided with annularly distributed threaded holes and two rows of vertically oriented threaded holes. The annularly distributed threaded holes connect to the left vibration side guard plate 101 and the right vibration side guard plate 102 of the front frame, respectively, and the two rows of vertically oriented threaded holes connect to the transverse fixing plate 7 of the front frame. The transverse fixing plate 7 of the front frame has three rows of vertically oriented threaded holes at each of its left and right ends, allowing adjustment of the horizontal distance between the left side plate 5 and the right side plate 6 of the front frame by selecting the threaded hole connection positions. The left side plate 8 and the right side plate 9 of the rear frame are also provided with annularly distributed threaded holes and two rows of vertically oriented threaded holes. The annularly distributed threaded holes connect to the left vibration side guard plate 201 and the right vibration side guard plate 202 of the rear frame, respectively, and the two rows of vertically oriented threaded holes connect to the transverse fixing plate 10 of the rear frame. The left and right ends of the horizontal fixing plate 10 of the rear frame each have three rows of vertical threaded holes. The horizontal distance between the left side plate 8 and the right side plate 9 of the rear frame can be adjusted by selecting the connection position of the threaded holes.

[0041] like Figure 3 As shown, a front connecting seat 701 is located at the center of the front frame transverse fixing plate 7, and the connecting seat 701 is connected to the front electro-hydraulic servo actuator. A rear connecting seat 1001 is located at the center of the rear frame transverse fixing plate 10, and the rear connecting seat 1001 is connected to the rear electro-hydraulic servo actuator. Note that the front electro-hydraulic servo actuator, the rear electro-hydraulic servo actuator, the front and rear integrated frames, and the articulation device 3 are aligned on the same axis to prevent the frame from tipping over or twisting.

[0042] After completing the installation of the front and rear integrated chassis assemblies, the integrated chassis assembly is then connected to the front and rear electro-hydraulic servo actuators, along with components such as hydraulic servo valves, hydraulic actuator cylinders, shock absorbers, and a data acquisition system. The integrated chassis bench is then used to verify its reliability under simulated real-vehicle operating conditions. The data acquisition system includes displacement sensors, pressure sensors, load sensors, signal conditioning circuits, an analog-to-digital converter (ADC), a microprocessor, and a computer.

[0043] The actual vehicle operating condition is a fully loaded double steel drum roller operating in alternating static rolling / vibration compaction mode (excitation force amplitude 80 / 50kN, vibration frequency 45 / 60Hz, i.e., double large vibration condition). Based on the load-bearing conditions of various parts of the front and rear frames, the excitation force of the steel drum under the double large vibration condition and the direction of the excitation force of the steel drum under the maximum stress of the integrated frame are calculated through simulation. The constant displacement loading amount and loading direction of the electro-hydraulic servo actuator are then determined.

[0044] This invention discloses a bench test control method for the reliability of an integrated frame of a double-drum road roller, based on the aforementioned test apparatus, comprising the following steps:

[0045] Step 1: First, based on the simulation, high-stress areas and potential stress concentration points are accurately identified. Key stress / strain measurement points on the integrated frame are planned to identify these areas and potential stress concentration points, thus constructing a sensor network. Based on the analysis results, a detailed measurement point layout plan is developed. Multiple strain sensing units are arranged on the physical entity of the integrated frame at the high-stress areas and potential stress concentration points. Preferably, the strain sensing unit includes a triaxial strain gauge and / or a uniaxial strain gauge, and a laser displacement sensor and a triaxial ICP accelerometer are simultaneously installed (stress is calculated based on the weight of the front or rear frame). Further, the strain sensing unit is communicatively connected to a data acquisition system. The data acquisition system is configured to collect and record at least one of the strain, stress, and displacement data of the integrated frame during loading. This process is achieved by connecting to a high-precision, multi-channel data acquisition system via shielded cables. Before formal loading, all channels are calibrated, zeroed, and subjected to signal-to-noise ratio testing to ensure the accuracy and reliability of the collected data.

[0046] Step 2: Install the integrated frame onto the test platform using connecting fixtures. Then, adjust the spatial orientation of the integrated frame using a hydraulic servo attitude adjustment system. Subsequently, use a laser total station for precise six-degree-of-freedom spatial measurement to fine-tune the frame's orientation, ensuring that its longitudinal plane of symmetry coincides with the central axis of the test platform, and that the hinge centers of the front and rear frames are coplanar with the actuator force application axes. This alignment and calibration operation is verified using a laser positioning device to ensure that no additional bending moment or torque is introduced by unsymmetrical loads, preventing the frame from becoming unstable, sideslipping, or experiencing unexpected torsion during the test, and ensuring the purity of the load transmission path.

[0047] Step 3: Based on the predetermined load spectrum for the dual-vibration working condition, control at least one electro-hydraulic servo actuator to apply a cyclic load spectrum to the integrated frame. Further, the cyclic load spectrum is programmed by inputting the set load spectrum into the actuator control system based on the simulated load data of the dual-drum roller under the "dual-vibration" working condition.

[0048] Condition 1 (Vibration Compaction): Excitation force amplitude 80 kN, vibration frequency 45 Hz;

[0049] Condition 2 (Vibration Compaction): Excitation force amplitude 50 kN, vibration frequency 60 Hz;

[0050] Condition 3 ("Alternating static rolling / vibratory compaction"): The program sets two conditions to alternate in a certain time sequence, with a brief static load (0 kN) inserted in between to simulate the static rolling process.

[0051] Based on this load spectrum and the equivalent strain principle, corresponding displacement, force, or hybrid control modes are set in the control units of the front and rear electro-hydraulic servo actuators. The electro-hydraulic servo actuators are controlled by a servo controller. The servo controller adjusts the stroke and output force of the electro-hydraulic servo actuators based on the equivalent strain principle and preset PID control parameters. Through iterative debugging, the PID (proportional-integral-derivative) control parameters are precisely tuned, and reasonable stroke and overload protection switch thresholds are set to ensure that the actuators can reproduce the target load spectrum with high fidelity and accurately simulate the multiaxial stress-strain state of the frame under dual large vibration conditions.

[0052] Step 4: Before applying the cyclic load, apply a sweep frequency preload to the integrated frame. By analyzing the response of the integrated frame under the sweep frequency preload, identify its natural frequencies and mode shapes, collect the system's response data at each excitation frequency, calculate the system's transfer function, identify the frame's main natural frequencies, damping ratio, and mode shapes, and adjust the excitation frequency of the cyclic load accordingly to avoid resonance.

[0053] Step 5: Gradually increase the cyclic load to the target load level using a graded loading method, and maintain the target load level during a durability test. During the durability test, the data acquisition system continuously monitors and records the average and amplitude loads on key components of the integrated frame at a high sampling rate. The data acquisition system continuously records the dynamic strain time history, displacement changes, and acceleration response of key measuring points, and monitors the average and amplitude loads in real time.

[0054] Step Six: Monitor damage online during the duration of the durability test. Throughout the entire product design cycle, use strain-based online fatigue life monitoring software to visually inspect the pre-defined key areas of the integrated frame at predetermined time intervals or load cycles, and record the deformation of the integrated frame.

[0055] Step 7: After completing the durability test, failure analysis is performed, including a macroscopic inspection and full lifecycle assessment of the integrated frame. Combining all data recorded by the data acquisition system and the records from the periodic damage detection, and applying fatigue damage accumulation theory, a final assessment of the fatigue damage, durability limit, and structural reliability of the integrated frame is conducted. This provides detailed experimental data support and improvement directions for the optimized design of the structure.

[0056] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bench test control method for the reliability of an integrated frame of a double-drum road roller, characterized in that: The reliability test control method for the integrated frame of the double-drum roller includes the following steps: The test is based on a bench test device, which includes an integrated frame, comprising a front frame (1) and a rear frame (2). The front frame (1) and the rear frame (2) are connected by a hinge device (3). The front frame (1) and the rear frame (2) are respectively connected to the bench platform (4) via a front electro-hydraulic servo actuator and a rear electro-hydraulic servo actuator. Based on the load-bearing conditions of various parts of the integrated frame, simulation load data under the dual large vibration condition is obtained through simulation calculation. Based on the simulated load data, the set load spectrum programming is input into the control system of the electro-hydraulic servo actuator to enable at least one electro-hydraulic servo actuator to apply a cyclic load spectrum to the integrated frame. The cyclic load spectrum was gradually increased to the target load level using a graded loading method, and the target load level was maintained for durability testing. The dynamic strain time history, displacement change and acceleration response of key measuring points on the integrated frame were recorded during the durability test, and periodic damage detection records were obtained by online damage monitoring. Based on dynamic strain time history, displacement change and acceleration response, and periodic damage detection records, combined with fatigue damage accumulation theory, the fatigue damage, durability limit and structural reliability of the integrated frame are finally evaluated.

2. The reliability bench test control method for the integrated frame of the double-drum road roller according to claim 1, characterized in that: Before the electro-hydraulic servo actuator applies a cyclic load spectrum to the integrated frame, the spatial orientation of the integrated frame is controlled and adjusted so that the longitudinal symmetry plane of the integrated frame coincides with the central axis of the test platform (4), and the hinge center of the front frame (1) and the rear frame (2) is coplanar with the force application axis of the electro-hydraulic servo actuator.

3. The reliability bench test control method for the integrated frame of the double-drum road roller according to claim 2, characterized in that: The control and adjustment of the spatial pose of the integrated frame includes: first, adjusting the spatial pose of the integrated frame through the attitude adjustment system of the electro-hydraulic servo actuator; then, using a laser total station to perform precise spatial six-degree-of-freedom measurement to fine-tune the spatial pose of the integrated frame.

4. The reliability bench test control method for the integrated frame of the double-drum road roller according to claim 1, characterized in that: Before applying the cyclic load spectrum to the integrated frame, a sweep frequency preload is applied to the integrated frame to identify the main natural frequencies, damping ratios, and mode shapes of the integrated frame, and the excitation frequency of the cyclic load spectrum is adjusted according to the main natural frequencies, damping ratios, and mode shapes.

5. The bench test control method for the reliability of the integrated frame of the double-drum road roller according to claim 1, characterized in that: The determination of the key measuring points includes: identifying high-stress areas and potential stress concentration points on the integrated frame based on simulation, and then planning the key stress / strain measuring points on the integrated frame; the dynamic strain time history, displacement change and acceleration response are obtained by strain sensing units, laser displacement sensors and triaxial ICP accelerometers set on the key measuring points, respectively.

6. The reliability bench test control method for the integrated frame of the double-drum road roller according to claim 1, characterized in that: The dual large vibration conditions include: Operating condition 1: Excitation force amplitude 80 kN, vibration frequency 45 Hz; Operating Condition 2: Excitation force amplitude 50 kN, vibration frequency 60 Hz; Operating Condition 3: Operating Condition 1 and Operating Condition 2 are carried out alternately in a certain time sequence, with static loads inserted in between.

7. The reliability bench test control method for the integrated frame of a double-drum road roller according to claim 1, characterized in that: The front frame (1) is connected to the left side plate (5) and the right side plate (6). The left side plate (5) and the right side plate (6) are connected by the front frame transverse fixing plate (7). The rear frame (2) is connected to the left side plate (8) and the right side plate (9). The left side plate (8) and the right side plate (9) are connected by the rear frame transverse fixing plate (10). The front frame transverse fixing plate (7) and the rear frame transverse fixing plate (10) are connected to the test platform (4) through the front electro-hydraulic servo actuator and the rear electro-hydraulic servo actuator, respectively.

8. The reliability bench test control method for the integrated frame of a double-drum road roller according to claim 7, characterized in that: The front frame (1) is provided with a left vibration side guard plate (101) and a right vibration side guard plate (102). The left vibration side guard plate (101) and the left side plate (5) of the front frame are connected by threaded holes, as are the right vibration side guard plate (102) and the right side plate (6) of the front frame. The rear frame (2) is provided with a left vibration side guard plate (201) and a right vibration side guard plate (202). The left vibration side guard plate (201) and the left side plate (8) of the rear frame are connected by threaded holes, as are the right vibration side guard plate (202) and the right side plate (9) of the rear frame.

9. The reliability bench test control method for the integrated frame of a double-drum road roller according to claim 7, characterized in that: The left side plate (5) and right side plate (6) of the front frame are connected to the transverse fixing plate (7) of the front frame through threaded holes, and the left side plate (8) and right side plate (9) of the rear frame are connected to the transverse fixing plate (10) of the rear frame through threaded holes.

10. The bench test control method for the reliability of the integrated frame of the double-drum road roller according to claim 7, characterized in that: A front connecting seat (701) is provided at the center of the front frame transverse fixing plate (7), and the connecting seat (701) is connected to the front electro-hydraulic servo actuator. A rear connecting seat (1001) is provided at the center of the rear frame transverse fixing plate (10), and the rear connecting seat (1001) is connected to the rear electro-hydraulic servo actuator.

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