Definition
3. Comprehensive environmental test chamber is an experimental equipment used to simulate and simultaneously apply three environmental stresses: temperature, humidity and vibration to evaluate the reliability and adaptability of products under complex environmental conditions. It integrates the temperature and humidity test chamber with the shaker table to realize dynamic mechanical testing in a controlled temperature and humidity environment, and is widely used in the environmental adaptability verification of industrial products.
Principle
The working principle of the device is based on the superposition effect of environmental stress. Its temperature and humidity subsystem adjusts the chamber temperature through refrigerant circulation and electric heater, and uses steam generator or water jet humidification and dehumidification system to control humidity. The vibration subsystem is typically electromagnetically or hydraulically actuated, producing a programmable vibration spectrum. The control system coordinates the subsystems so that temperature, humidity and vibration are loaded synchronously or sequentially according to a preset program, and the synchronization relationship can be expressed as:
Etotal = f(T, H, V, t)
where EtotalFor the comprehensive environmental effect, T is the temperature, H is the humidity, V is the vibration parameter, and t is the time variable.
Measurement method
The measurement process is based on relevant standards such as IEC 60068-2 series, GB/T 2423, etc. Platinum resistors or thermocouples are used for temperature measurement, which are evenly distributed in the working space. Humidity measurement mostly uses capacitive humidity sensors; The vibration parameters are collected by means of an accelerometer mounted on the specimen or on the vibrating table. The data acquisition system records the curve of each parameter with time in real time, and evaluates the performance attenuation, structural response and other indicators of the product through the analysis software.
Influencing factors
The accuracy of test results is influenced by a variety of factors. The equipment includes the uniformity of the working space, the rate of temperature change, the lateral motion ratio of the vibrating table, etc. The specimen factors involve mass distribution, heat capacity and fixation method. Operating conditions such as test profile design and the timing relationship of each stress will also significantly affect the results. Environmental conditions such as vibration of the laboratory foundation and the quality of the power supply also need to be taken into account.
Application:
The device has application value in several industrial fields. In the automotive industry, it is used to verify the durability of electronic controllers, lamps, etc. in driving vibration and temperature and humidity environments. The aerospace field is used to test the comprehensive environmental tolerance of airborne equipment during takeoff, cruising, and landing phases. In electronics manufacturing, the reliability of circuit boards and connectors is evaluated under humid heat and vibration conditions. In the field of new energy, it is used in the environmental adaptability test of battery packs, photovoltaic inverters and other products.
Selection
When selecting, it is necessary to comprehensively consider the technical parameters and usage requirements. Technical parameters include temperature range, humidity range, vibration frequency and amplitude, working space size, temperature change rate, etc. In terms of system compatibility, it is necessary to pay attention to the interface design between the shaker and the temperature and humidity chamber, and the integration of the control system. Scalability considerations such as whether to support multi-axis vibration upgrade and salt spray test function expansion. The use requirements should be matched based on product test standards, sample size and quality, and typical test profiles. In addition, energy consumption levels, maintenance convenience and supplier technical support capabilities are also reference factors when selecting a model.