Crane Truck Research Articles

Evaluation of noise reduction performance of new steel noise barrier for Shinkansen

Since Shinkansen viaducts are aged, a large-scale renovation project has been planned. In this project, aged noise barriers are scheduled to be removed and replaced. In this background, it is required to develop a new noise barrier with high constructability and high effectiveness in noise reduction. Therefore, the authors have developed a steel noise barrier without the decrease of noise barrier performance, of which weight is about 1/3 of existing concrete noise barriers. It is expected that the load on floor slabs by the developed noise barrier is more reduced, and no crane truck is basically needed for installation work. One of the features of the developed noise barrier is that all the surfaces on track side are consisted of sound absorbing materials with steel plates with small holes on it. The sound absorbing material used in the developed noise barriers has suitable sound absorbability for the frequency characteristics of the noise generated during train running. In order to evaluate the noise reduction performance, the developed noise barrier was tested on the Shinkansen track and noise measurement was conducted at the place with certain distance from the Shinkansen viaduct. As a result, the noise generated from the lower part of cars was significantly reduced on the overall level.

Experimental studies on vibration acceleration in the vertical direction on the modernized traveling wheels of the bridge crane truck

Experimental studies on vibration acceleration in the vertical direction on the modernized traveling wheels of the bridge crane truck

Optimal organization of lifting operations at the construction site

The study is dedicated to identifying the influence of the tower crane location and its technical characteristics in panel housing construction for the duration of lifting operations. The organization of the construction site is represented by a triangle, at the tops of which a tower crane, a warehouse of panels and a place of installation are located. It is assumed that the delivery of goods is carried out separately by turning the crane and then moving the crane truck in the right direction. The computer model is described by a nonlinear trigonometric equation, the roots of which were found by the Newton method. As a result of a model study, it was found that to accelerate lifting operations, it is necessary to select a crane with a large boom reach and move it further away from the direct connecting warehouse to the installation site, achieving the isosceles of the triangle formed by the crane, warehouse and installation site, and also the minimum lifting time operation increases with decreasing angular velocity of the tower crane.

Finite element analysis of crane truck main beam based on abacus

The load size of a crane’s main girder during different working conditions is analysed and calculated. By using Solidworks three-dimensional software to establish the related model, and then the model is introduced into the abacus for finite element analysis. The stress and strain of the main girder of the crane in different conditions are obtained. According to the results of the finite element analysis, the risk position of the main girder in the working process can be found. The maximum stress 266.8MP of the most dangerous working condition of the crane is less than the allowable stress value of 282.8MP, which satisfies the strength requirement. The maximum deflection is 4.422mm, less than the limit of deflection 9.5mm, which satisfies the stiffness requirement. The analysis methods and results of this paper provide some basis and reference for the improvement and optimization of the main girder structure of the truck.

Dynamic Analysis and Optimization of Pivot Points of Telescopic Jib Based on Genetic Algorithm

Using ADAMS software to create a virtual prototype model of luffing mechanism of QY20A crane truck. The entire work process of telescopic arm is analyzed, and the result shows that luffing cylinder lifting force is maximum at the beginning moment. The luffing cylinder force is calculated in different conditions based on the analysis and select the maximum force condition as optimized conditions, make the mathematical model of optimization and optimized using genetic algorithm, which played a guiding role for the of telescopic boom design.

고속도로 주행 중 발생한 집게트럭 화재의 분석

우리나라에서 2012년도에 고속도로에서 1,003건의 자동차화재가 발생하였고, 이 중 트럭화재가 489건으로 43.8%를 차지하였음에도 아직 고속도로에서 발생한 트럭화재에 대해 구체적으로 분석한 논문은 없다. 이 논문에서는 신차 구입 후 50일 경과한 총주행거리가 6,000 km 정도인 집게 트럭이 고속도로 주행 중에 발생한 화재에 대해 화재원인 등을 구체적으로 분석하고 있다. 화재에 대한 분석 결과, 이 집게트럭의 화재는 엔진룸 우측의 차체 프레임 관통부에서 운전실의 조수석 앞쪽으로 배선된 하니스 전선의 피복이 손상되어 전선 도체가 철재 받침대와 닿아서 합선(단락)되어 발생되었다. 1,003 automotive fires broke out in the expressway in 2012 in Korea. Although truck fires accounted for 43.8%(489), there are few researches on the truck fires in the expressway. This study analyzed the cause of the knuckle crane truck fire breaking out during expressway driving. The truck was purchased 50 days ago and its mileage was 6,000 km. The results of analysis suggested that the fire was caused by a short made by a conductor touching an iron support because of damaged coating of wire harness wiring from the penetration of the body frame on the right of an engine room to the driver room.

Development of Measurement Device of Working Radius of Crane Based on Single CCD Camera and Laser Range Finder

In this paper, what we want to do is to develop an observation device to measure the working radius of a crane truck. The device has a single CCD camera, a laser range finder and two AC servo motors. First, in order to measure the working radius, we need to consider algorithm of a crane hook recognition. Then, we attach the cross mark on the crane hook. Namely, instead of the crane hook, we try to recognize the cross mark. Further, for the observation device, we construct PI control system with an extended Kalman filter to track the moving cross mark. Through experiments, we show the usefulness of our device including new control system of mark tracking.

Visual Feedback Tracking with Laser to Moving Crane Hook

This paper introduces measurement of the working radius of a crane truck based on visual feedback control. In order to realize the measurement, we developed an observation device which is equipped with a CCD camera, a laser range finder, and AC servo motors. Further, we propose a new algorithm for mark recognition and construct a control system with an extended Kalman filter to eliminate a time delay. By performing several experiments, we verify the performance of the observation device, and show the effectiveness of our proposed method.

Analysis of failure of axle housing of crane truck with fracture mechanics

The failure of an axle housing in a crane truck has been successfully analyzed with the aid of fracture mechanics. The cause of failure was the field addition of stop blocks welded to the axle housing. The time from crack penetration of the axle housing to final failure was too short for the presence of such a crack to have been detected by routine maintenance.