For Delong cab side panels, rear enclosed double wall structure, can be filled with glass fiber in its cavity, felt, foam heavy truck cab to increase the insulation effect. Sound waves in the penetration process, the reflection at the interface of several different media, the porous material portion is absorbed acoustic energy, noise can play an effective role. After the body sealing performance can be tested by ultrasonic leak detector, the ultrasonic generator is turned into an open area at the center of the cab, closed the door windows, outside the cab scanning ultrasonic receiver seal windows and doors, front wall and floor apertures place heavy truck cab, in order to find out more serious leak area. According to the test results, the car doors and windows sealed bad at checking the sealing system architecture design is reasonable Chinese heavy truck cab assembly, sealing strip assembly is biased, to harness via joystick pieces should be strengthened through the hole using a sealing material In addition also ensure assembly, welding precision sheet metal parts to meet the requirements, the use of rubber seal coating should be in place. Heavy truck cab development goals: (1) economic objectives control, cost, schedule and user requirements (demand). (2) technical target control heavy truck cab exterior parts, technical specifications, design quality, process design quality, manufacturing quality. To achieve these objectives, in the design of modern design methods should be employed, through the implementation of the following to complete the objectives and tasks: First, technical support via computer simulation and modeling techniques; the second is to establish a scientific mechanism and process design; third is to establish Scientific development platform. Heavy truck cab accessories | heavy duty truck cab | Jinan Yiu Cheung Yiu Cheung provided by Jinan Trading Company. Jinan Yiu Cheung Trading Company (www.jinanyaoxiang.com) strong, credible, in Jinan, Shandong engine assembly industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead you hand Jinan Yao harmony into the brilliant, for a better future!