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Quartz Weighing Sensor Reliability Testing Technology for WIM systems

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  Overloading and exceeding limits of highway vehicles cause significant damage to road surfaces and pose a high risk of safety accidents, a particularly serious issue in our country where 70% of road safety incidents are attributed to vehicle overloading and exceeding limits. This results in direct economic losses of nearly 3 billion RMB, with losses from vehicle overloading and exceeding limits on highways exceeding 30 billion RMB annually. Hence, it's critically important to monitor and supervise overloaded vehicles on highways. In order to regulate vehicle overloading without disrupting traffic, the Weighting In Moving (WIM) highway dynamic weighing scheme has emerged. This system utilizes piezoelectric quartz sensors to quickly measure vehicle weight as vehicles pass over the road surface at high speeds (<120km/h) and trigger monitoring cameras for photographing. Enviko quartz sensors are specially designed for low-cost, high-performance piezoelectric quartz sensors for hig

Improved Installation Scheme for Piezoelectric Quartz Weighing Sensors on Asphalt Pavement

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  1. Background Technology   Currently, WIM systems based on piezoelectric quartz weighing sensors are widely used in projects such as overload monitoring for bridges and culverts, non-site overload enforcement for highway freight vehicles, and technological overload control. However, to ensure accuracy and service life, such projects require cement concrete pavement reconstruction for the piezoelectric quartz weighing sensor installation area with the current technology level. But in some application environments, such as bridge decks or urban trunk roads with heavy traffic pressure (where the cement curing time is too long, making long-term road closures difficult), such projects are difficult to implement.   The reason piezoelectric quartz weighing sensors cannot be directly installed on flexible pavement is: As shown in Figure 1, when the wheel (especially under heavy load) travels on the flexible pavement, the road surface will have a relatively large subsidence. However, when rea

Different Types of Overload Weighing Systems for Trucks on Highways

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On January 1, 2020, nationwide expressways implemented weighing at entrances and a policy of persuading overloaded trucks to turn back or prohibiting them from entering. This effectively prevented overloaded vehicles from driving on expressways, curbing the rampant phenomenon of truck overloading. However, driven by interests, the chaos of overloading was not completely eliminated. Overloaded vehicles that were rejected from expressways surged onto national highways, provincial roads, and county roads, posing huge safety hazards. As a result, relevant local departments began to carry out special rectifications. Dynamic road vehicle automatic weighing systems achieved a leap from traditional to technological overload control, greatly reducing the workload of overload control, and were widely applied to various overload control sites, playing an important role in cracking down on illegally overloaded vehicles. The mainstream technologies for dynamic road vehicle automatic weighing system

FREE FLOW WEIGHING 2-2

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The new standard level for high-speed weigh-in-motion, Free low weighing(2-2). Enviko has been specializing in Weigh-in-Motion Systems for over 10 years. Our WIM sensors and other products are widely recognized in the intelligent transportation systems industry. Enviko Technology Co.,Ltd E-mail: info@enviko-tech.com https://www.envikotech.com

FREE FLOW WEIGHING 1-2

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The new standard level for high-speed weigh-in-motion, Free low weighing. Enviko has been specializing in Weigh-in-Motion Systems for over 10 years. Our WIM sensors and other products are widely recognized in the intelligent transportation systems industry. Enviko Technology Co.,Ltd E-mail: info@enviko-tech.com https://www.envikotech.com

Different WIM technologies

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  Different types of vehicle weighing Independent of the sensing technology used, there are several different ways to measure the gross vehicle weight, axle group loads and axle loads of a vehicle. In general, a complete WIM system includes: 1. A set of weighing sensors, either mounted in the pavement (In-road sensors), or attached to a bridge (B-WIM). For on-board WIM, the sensors are installed on the vehicle. Additional sensors are mostly used to measure vehicle speed, length, wheel transverse location, etc. Road sensors can be scales, plates, strips or bars mounted inside the pavement, and sometimes mats attached to the pavement surface. Strain transducers or strain gauges are most commonly used for Bridge WIM installations. Strain gauges, load cells, pressure transducers, etc. are used for on-board weighing. 2. A road side unit – or central vehicle unit - containing all the electronics including a data acquisition tool, data processing unit with software for weight calculation, (se

Weigh-in-Motion

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  Strengths of WIM Processing Rate .  Trucks can be weighed as they as they travel at highway speeds, resulting in a significantly greater number of counted vehicles in a short period of time compared to static weight stations. Safety .  The minimization of static weighing will significantly decrease vehicle accumulation at highway lanes leading to weight stations. Continuous data processing .  WIM can be performed continuously rather than static weighing, which uses traffic streams samples.  This can eliminate any inherent data bias in static weighing. Increased coverage and lower cost .  More sites may be monitored with WIM at the same cost. Minimized scale avoidance .  WIM can monitor truck traffic without alerting truck drivers.  This results in more truthful data as overweight trucks are less likely to avoid weighing stations. Shortcomings of WIM Less accurate .  WIM systems are less accurate than static scales. According to the National Bureau of Standards, wheel load scales are